原田鉄工 List of Products and Services

Can-making refers not only to the production of cans and canned goods but also involves the manufacturing of aluminum cans and one-gallon cans. In the manufacturing industry, it also refers to the processing of steel plates and shaped steel to create three-dimensional products such as tanks, covers, frames, and machinery. While the general public may have an image of making cans, they might have less of an image of creating products. However, for those involved in manufacturing, "can-making" is frequently used in the context of producing products. Let’s explore the world of can-making, which may seem familiar yet is not well understood. For more details, please download the PDF below. Harada Ironworks Hiroshima Official Link

• Special Construction Method
• Crane and others
• Metalwork

After degreasing the flat bar, it will be coated with a two-layer specification. When using a spray gun, the work efficiency decreases compared to airless spraying, but it minimizes paint loss, allowing for painting with a small amount of paint. Additionally, while the types of paint that can be used are limited, the paint particles sprayed are finer than those in airless painting, resulting in a beautiful finish. Airless spray is a method that atomizes paint under pressure without using air and sprays it in a mist. It is specialized for achieving thicker film thickness and painting large products. On the other hand, air spray simultaneously injects air and atomized paint for painting. Because the atomized paint particles are fine, it allows for uniform and beautiful painting. However, due to the high amount of overspray, the transfer efficiency is lower. [Product Information] FB12×100 L=1520mm [Coating Specifications] Modified epoxy resin coating × 1 time Polyurethane resin top coating × 1 time Harada Iron Works Hiroshima Official Link

• Rust Inhibitor
• Special Construction Method
• paint

This time, we will apply blast treatment and inorganic zinc coating to a frame measuring 10m in length and 2m in width. Inorganic zinc is officially referred to by two names: "inorganic zinc-rich paint" and "inorganic zinc-rich primer." The difference between these two lies in the distinction between thick-film and thin-film types, which can be a bit confusing. For this project, we used the thick-film type of inorganic zinc-rich paint. This paint contains a large amount of zinc powder and is specifically designed for priming. Zinc has a greater tendency to ionize than iron and is more prone to rusting. Therefore, the paint serves to protect the iron from corrosion by rusting in its place. Due to its corrosion-resistant properties, it is commonly used in harsh environmental conditions, such as on large ships, bridges, and plants. [Product Information] 2000×10000 [Surface Preparation] Grit Blast SSPC SP-10 [Coating Specification] Inorganic Zinc Rich Paint 75μm Harada Iron Works Hiroshima Official Link

• Rust Inhibitor
• Special Construction Method
• paint

Our company owns a manual blast facility with dimensions of 6m in width, 10m in depth, and 3m in height, which can accommodate the construction of complex fabricated products. This facility can be applied to various purposes, including surface preparation before anti-corrosion treatment, paint stripping of maintenance items, removal of oxidation films after heat treatment, and improving adhesion through increased surface area. We used SS400 products as test pieces and verified the results by changing only the abrasive material while using the same equipment and air pressure. For grit blasting, we used IKK steel grit TGE-100, and for sandblasting, we used NeoBlast G-1. The results were as expected, with both methods effectively removing scale and rust. However, there were clear differences in surface roughness and appearance. Grit blasting resulted in a slightly rougher surface, while sandblasting produced a somewhat dull finish. Our company differentiates between sandblasting and grit blasting, taking into account the size and material of the workpiece, recommended surface roughness, and whether masking is required. By leveraging the characteristics of each method and performing optimal processing, we achieve high-quality finishes. Harada Ironworks Hiroshima Official Link

• Rust Inhibitor
• Special Construction Method
• paint

Harada Iron Works, located in Kanon, Nishi Ward, Hiroshima, utilizes its 80 years of experience to create products tailored to customer requests, including prototypes, specialized equipment, and jigs. We focus more on one-off and small lot products than on mass-produced items. With a site area of 3,700 square meters and a painting area of 650 square meters, we can flexibly respond to various demands. Harada Iron Works Hiroshima Official Link

• Rust Inhibitor
• Special Construction Method
• paint

[Labor-saving devices and transport equipment] Integrated production by Harada Ironworks. Manufactured from drawings based on customer requests. Flexible response to confirmation and modifications in-house. Quick delivery and consistent quality. In-house equipment prioritizes ease of use. Customization of existing products is also possible. Utilizing 80 years of know-how and technology. Harada Ironworks Hiroshima Official Link

• Rust Inhibitor
• Special Construction Method
• Manufacturing Equipment

The interior is untreated, and only the exterior has been painted. The tank is large, with dimensions of 2500mm in diameter and 4400mm in height. The specifications include painting after blast treatment with a salt-resistant coating. First, impurities and rust on the surface were removed by blasting, and then the paint was applied in six layers, consisting of inorganic zinc, thick-film epoxy resin, and urethane resin. Although not shown in the photos, the handrails and stairs were also painted, with the top coat being yellow. Even with such a large tank, the number of overhead cranes and the spacious painting area allowed for the painting to be carried out without any issues. The delivery time was slightly over one week, but by using cranes for the painting, we were able to reduce the labor involved in flipping the tank and manage to meet the scheduled delivery date. Harada Iron Works Hiroshima Official Link

• Rust Inhibitor
• Special Construction Method
• paint

This plate is quite corroded and covered in rust. However, all the rust can be completely removed through blasting treatment. Typically, when rust occurs, it is common to use sandpaper, disc sanders, or power brushes to scrub it off. However, if the corrosion is extensive or deep, it may not be completely removable. In such cases, blasting treatment can completely remove the rust. For base materials with advanced rust, it is necessary to perform rust prevention treatment immediately after surface preparation through blasting. Even a short period of 1 to 2 hours without rust prevention treatment can lead to renewed rust progression and darkening of the surface, so caution is required. The "lifespan of the paint" on metal products, or rather the "lifespan of the product," is greatly influenced by the preparation of the base material! No matter how high-quality the paint used or how advanced the application techniques are, the thoroughness of the cleaning of the base material before painting has a significant impact.

• Rust Inhibitor
• Special Construction Method
• paint

The rolls have aged, and the rubber has worn out and become unusable. In addition to the rubber, there are also issues like rust, so first, we will cleanly strip the rubber using blasting, and then we will reapply the rubber. It's pleasant to see the product beautifully revived! Please note that our company cannot handle rubber application work. Since the process of stripping the rubber takes time, we will first strip the rubber from the rubber rolls using grit blasting after they arrive. Then, just before shipping, we will completely remove the rust with sandblasting and prepare for shipment. By removing the rubber and rust and reapplying the rubber, the product will be in like-new condition. Furthermore, the blasting creates a rough surface, which increases the surface area, improves the adhesion of the rubber, and enhances the durability of the product. Harada Ironworks Hiroshima Official Link

• Rust Inhibitor
• Special Construction Method
• paint

What the customer requested was our in-house jig. Unfortunately, the product had been used for many years, resulting in peeling paint and advancing rust. This jig was old, and there were no existing drawings, so new production would require time and budget. Therefore, we only performed modifications and repairs on the necessary parts, along with repainting. First, we removed the paint and rust using blasting (Type 1 surface preparation) and conducted surface treatment. After that, we applied a primer and topcoat, completing the product. This product measures 1500×1500 L=2500, and we used grid blasting, performing surface preparation according to SSPC SP-10. Additionally, we applied one coat of epoxy-modified alkyd resin primer and one coat of synthetic resin blended paint for the topcoat. The repair and modification took only four days. It took a bit longer due to the need to differentiate the painting of the main frame and the handrails and ladder, but we were able to accommodate the short delivery time. After blasting, the painted product became remarkably clean and its durability improved. Harada Ironworks Hiroshima Official Link

• Rust Inhibitor
• Special Construction Method
• paint

At the request of a press machine manufacturer, due to the large number of parts, various post-processing steps such as machining, plating, and lining were necessary. With the help of our partner companies, we completed products weighing over 20 tons. ◎ Press Machine (Forging Machine / Press Machine in English: Forming Press) A machine that processes materials such as metal by sandwiching them between upper and lower molds to create the same shape. There are two operating methods: "mechanical press" and "hydraulic press." ◎ Hot Dip Galvanizing (Dipping in English: Hot Dip Galvanizing) A process that involves immersing steel materials in molten zinc at high temperatures to form a zinc coating on the surface for rust prevention. Harada Iron Works Hiroshima Official Link

• Processing Technology

Castings made by melting metal and pouring it into molds have burrs and mold material attached, which are removed through blasting treatment. Blasting uses abrasive materials to grind the surface and create irregularities, improving the adhesion of coatings. Castings can be produced in large quantities and come in two types: die castings and sand castings. Die castings are excellent in wear resistance but are costly and suitable for mass production, while sand castings are inexpensive and can accommodate complex shapes. Harada Iron Works manufactures its own blasting equipment measuring 6m in width, 10m in depth, and 3m in height. Additionally, blasting treatment is used not only for surface cleaning but also for modification and shape processing. For example, performing blasting treatment on metal products can enhance surface strength and make it easier to apply resin or coatings. Furthermore, applying blasting treatment to hard materials such as glass and stone can express beautiful textures and designs. Our blasting equipment is large and capable of handling a wide range of applications, and we respond flexibly to customer needs. Harada Iron Works Hiroshima Official Link

• Rust Inhibitor
• Special Construction Method
• paint

Lining products that are often discarded or left unused. However, when used for a long time, the rubber, resin, and plating on the surface can deteriorate and rust. It is also difficult to reline them, and a clean stripping through blasting treatment is necessary. Harada Iron Works' blasting creates a fine uneven surface, improving adhesion and transforming the products into longer-lasting ones. Compared to making new similar products, it can be done overwhelmingly 'faster' and 'cheaper.' Harada Iron Works has its own grit blast and sandblast equipment. This blasting process is suitable for products that have the option of being discarded or reused. For example, it is effective not only for the reuse of rubber linings but also for surface treatment of steel materials, machine parts, ships, tanks, and more. Blasting completely removes surface dirt and deteriorated layers, providing a perfect pre-treatment for new painting. Additionally, Harada Iron Works' blasting equipment uses its own grit blast and sandblast systems. These are environmentally friendly and allow for efficient work. Furthermore, the large size of the equipment enables it to handle large products as well.

• Rust Inhibitor
• Special Construction Method
• paint

We compared samples with and without a primer. For surface preparation, we degreased with cleaning thinner and roughened the surface with sandpaper. The painting specifications used an epoxy-modified resin paint for the primer and an acrylic-modified phthalic resin paint for the topcoat. After allowing sufficient drying time, tests were conducted. When removing the masking tape, the area without primer had the paint peel off with it. The primer has a high adhesion to the substrate, and when used together with the topcoat, it maximizes the performance of the paint. Skipping the primer may result in a visually appealing finish, but the performance of the paint is compromised. By performing blast treatment, a stronger paint film can be formed. Omitting the primer reduces the adhesion of the paint, making it more prone to peeling and deterioration. The combination of primer and topcoat allows the paint to adhere to the surface, enhancing the strength and durability of the paint film. The primer is an essential process for maximizing the performance of the paint and ensuring quality. While it is possible to shorten the process by omitting it, this will affect the durability and quality of the coating.

• Rust Inhibitor
• paint

When comparing products that only have a topcoat without a primer to standard painting products that include a primer, it was found that the products without a primer easily had their paint film peel off. Primer paint has the dual effect of preventing rust and strongly adhering to the substrate and base material, so it cannot be omitted. Although the primer is not visible, it plays an important role in maintaining corrosion resistance. Additionally, if the primer is not applied properly, the topcoat may be applied unevenly or show inconsistencies, resulting in an unattractive finish. Furthermore, the primer enhances the permeability of the paint, allowing the topcoat to adhere better, which can improve the durability and anti-corrosive properties of the paint film. In other words, the primer is a crucial step that significantly affects not only the appearance but also the performance and lifespan of the paint. Therefore, omitting the primer greatly increases the likelihood of having a paint job that peels easily or products that are prone to rust, making it essential to always apply an appropriate primer.

• Rust Inhibitor
• Special Construction Method
• paint

It is not the wonderful equipment or high-performance paint that matters most, but rather the proper surface preparation that is the most important. Surface preparation is the process of preparing the surface to be suitable for painting, which includes cleaning, removing impurities, and roughening or smoothing the surface. Surface preparation greatly affects the lifespan of the paint, with the proportion of substrate adjustment reaching as high as 49.5%. There are three benefits to surface preparation: removing impurities, improving adhesion, and achieving a beautiful finish. In painting work, thorough surface preparation is carried out to prevent painting defects.

• Rust Inhibitor
• Special Construction Method
• paint

The breakdown of life cycle costs consists of six components: construction costs, operating costs, utility costs, repair costs, management costs, and disposal costs. Construction costs include planning and design fees, material costs, manufacturing costs, transportation costs, and on-site construction costs. On the other hand, operating costs include security costs, cleaning costs, and maintenance and inspection costs. Utility costs encompass expenses for water supply and sewage, gas, electricity, and so on. Repair costs require expenses for regular maintenance, equipment and parts replacement, and repairs. Management costs include operating costs, taxes, and insurance expenses. Finally, disposal costs involve expenses related to demolition. Initial costs account for about 20-25% of the total for many structures and products, which is surprisingly low. However, the composition of running costs can vary significantly depending on the use, and renovation and repair costs may exceed construction costs. Large structures, such as bridges, were built in large numbers during the period of rapid economic growth, but they are now aging. It is not realistic to replace all structures with new ones, so appropriate renovation and repair work is essential. To ensure safe use over a long period, it is necessary to accurately understand and manage life cycle costs.

• Rust Inhibitor
• Special Construction Method
• paint

"Approaches to Improving Coating Quality" The causes of defects and troubles that occur in the coating process can be classified into five categories: 1. Defects due to the condition of the substrate 2. Defects due to the quality of paint or solvents 3. Defects in coating equipment or facilities 4. Defects in application methods or conditions 5. Defects due to the application environment These issues can be avoided through prior measures. However, defects caused by the application environment may require investment in equipment or changes in processes. Nevertheless, by adjusting the process according to weather conditions and managing delivery schedules, troubles can be avoided. When coating defects occur, the corrosion resistance and aesthetics of the product are diminished, necessitating corrections by sanding or stripping the coating. This is a labor-intensive and time-consuming task that also incurs costs. Therefore, it is important to address the causes in advance to improve coating quality.

• Rust Inhibitor
• Special Construction Method
• paint

This product is exposed to wind, rain, and ultraviolet rays on the outside, and water flows inside, necessitating painting. First, a type of shot blasting was used for surface preparation to remove dirt and uneven areas. After that, three layers of paint were applied. Since the painting specifications differ between the exterior and interior of this product, masking is done to prevent paint from getting on the inner surface before painting. The outer diameter is approximately φ3000, and the weight is about 5 tons. For the exterior painting specifications, a two-component polyamide amine cured modified epoxy resin is used for the primer, the same type of resin for the intermediate coat, and a two-component polyamide amine cured modified epoxy resin-based enamel for the top coat, resulting in a total film thickness of 120 μm. This product is finished without defects such as drips, painting failures, or insufficient film thickness.

• Rust Inhibitor
• Special Construction Method
• paint

Harada Iron Works has two blast rooms suitable for photo sizes. Both are manual, allowing workers to hold the nozzle and perform blasting operations. This makes it possible to process the interiors of tanks and pipes, as well as complexly shaped fabricated products. Additionally, the blast rooms have doors at both the front and back, allowing for the processing of items over 10 meters in length. This blasting equipment is all manufactured in-house by Harada Iron Works and is designed to be in optimal condition for surface preparation before painting.

• Rust Inhibitor
• Special Construction Method
• paint

This product was completely black due to the presence of mill scale (black skin) on the surface before processing. However, by using a technique called blasting for surface preparation, we were able to remove the mill scale from the surface and expose the material itself. Blasting is a technique that removes impurities attached to the surface by spraying high-pressure air or water. Steel changes to a silvery color in this way. By removing impurities such as mill scale and rust from the surface and applying paint, the adhesion of the paint improves, and the lifespan of the paint film is extended. Additionally, it can prevent defects and deterioration in painting caused by insufficient surface cleanliness. If the paint does not adhere properly, the paint film may peel off or discolor. Surface impurities are a major enemy to painting and are a crucial factor that affects the lifespan of the paint. If painting is done without surface preparation, impurities will remain beneath the paint film, accelerating its deterioration. Currently, the SDGs (Sustainable Development Goals) have become a global objective, and we aim to extend the lifespan of products by combining blasting and painting to utilize resources more effectively. By extending the lifespan, we can reduce the frequency of product replacements, leading to resource conservation.

• Rust Inhibitor
• Special Construction Method
• paint

"Surface preparation" refers to the process of preparing the underlying material or substrate. Metals are melted, cooled, and solidified during the manufacturing process, but when exposed to high temperatures, they combine with oxygen in the atmosphere to form a film known as an oxide layer. If painting is done without removing this oxide layer and impurities, contaminants will mix between the paint and the substrate, leading to poor adhesion. Additionally, the functionality of the paint will not be realized due to the influence of impurities, preventing it from performing as intended. However, by using blasting to prepare the substrate, the surface oxide layer, rust, and other contaminants can be completely removed. Furthermore, by using angular abrasives, countless fine irregularities are created on the substrate, increasing the surface area for paint adhesion and preventing peeling. By cleaning and preparing the substrate with blasting before painting, the lifespan of the paint film can be extended two to three times, providing long-term economic benefits.

• Rust Inhibitor
• Special Construction Method
• paint

Casting is a manufacturing method that involves melting metal and pouring it into a mold to solidify into a specific shape, and the resulting products are called castings. This method allows for mass production of complex shapes, is cost-effective, and boasts high durability. However, without painting, castings have a tendency to rust very easily. To paint castings, "degreasing" and "blasting" are essential. The surface is covered with oil, oxidation films, and debris, so simply painting without preparation will cause the paint to peel off quickly. Additionally, the surface of castings is uneven, and standard surface preparation using sandpaper or power tools can only smooth out the raised areas. Therefore, by removing oil through degreasing and performing blasting to prepare the surface even on uneven areas, it becomes possible to paint the castings. Harada Iron Works' blasting equipment is manual, allowing workers to hold the nozzle and perform surface preparation thoroughly, even on the complex shapes of castings. Great painting comes from proper surface preparation! [Weight] Approximately 3 tons [Surface Preparation] Grid blast SSPC SP-10 [Painting Specifications] Thick-film aluminum-containing two-component epoxy anti-corrosion paint [Film Thickness] 100μm to 200μm

• Rust Inhibitor
• paint
• Casting and metal decoration

Spray painting on metal is a technique that improves aesthetics and weather resistance by spraying paint onto the surface of the metal. Commonly used paints include urethane paint, epoxy paint, acrylic paint, and fluorine paint. These paints can adhere to the metal surface and are excellent in durability and weather resistance. Surface preparation is essential for spray painting on metal. Surface preparation involves removing oils and rust from the metal surface to create a surface that allows the paint to adhere properly. Methods for surface preparation include sandblasting and shot blasting. Additionally, spray painting on metal is performed using a painting machine. A painting machine is a specialized device for spraying paint, which uses a spray gun or nozzle to apply the paint evenly onto the metal surface. After application, drying and curing processes are carried out to form a paint film. Maintenance after spray painting on metal is important. If the paint film is damaged, it is necessary to repaint. Regular cleaning and maintenance after painting can help maintain durability and weather resistance. Spray painting on metal is an important technique for enhancing aesthetics and durability, and it is utilized in many fields.

• Rust Inhibitor
• paint
• Special Construction Method

Blast treatment is a type of surface treatment technology used to remove dirt and old paint from surfaces such as metal, concrete, and wood. Media: The media used in blast treatment includes sand, beads, glass beads, steel shot, steel grit, alumina, and carbon steel. These media are ejected from blast treatment equipment and collide with the surface to remove dirt and old paint. Pre-treatment for painting: Blast treatment is also used for surface preparation before painting. As a pre-treatment for painting, blast treatment improves the adhesion of paint by removing surface dirt and old paint, enhancing the durability and rust resistance of the painted surface. Additionally, by changing the surface shape, it can increase the adhesive surface area for the paint, thereby improving painting quality. Blast treatment is one of the surface treatment technologies and is used in many industrial fields. By selecting the appropriate media, pressure, injection direction, and time, it efficiently removes surface dirt and old paint, and is widely utilized for applications such as pre-treatment for painting, surface modification, and metal processing.

• Rust Inhibitor
• Special Construction Method
• paint

What is blasting processing? Blasting is a type of surface treatment that involves projecting abrasive materials at high speed to process the surface. This changes and improves the condition and properties of the surface. Structure of blasting processing There are two methods of blasting processing: "air type" and "mechanical type." The air type uses compressed air to project the abrasive materials, while the mechanical type utilizes a rotating impeller to project the materials using centrifugal force. Effects of blasting processing Blasting processing grinds the surface and removes impurities. Additionally, fine irregularities are formed, which enhance the adhesion of paints and anti-corrosion treatments. The finish of the painting also becomes more uniform. Blasting processing is effective for metal anti-corrosion treatment and improving appearance. Summary Blasting processing is an important method of surface treatment and is essential for the success of metal anti-corrosion and painting. The structure is simple, but its effects are significant.

• Rust Inhibitor
• Special Construction Method
• paint

Aluminum is often said to be a material that "cannot be painted" and "has paint that peels off," similar to stainless steel. In the past, it seems that such statements were made because there were no paints developed for aluminum, but now it is possible to paint it by using specialized paints and performing appropriate pre-treatment. We will introduce a painting method that can be applied not only to aluminum but also to stainless steel. For more details, please download the PDF below. Harada Ironworks Hiroshima Official Link

• Stainless steel sash
• Aluminum sash

Even if you think about trying painting, there are likely many things you don't understand, such as "What do I need?" and "How should I do it?" I will explain the "usage of tools used in painting," "what is necessary for painting," and "how to paint." For more details, please download the PDF below. Harada Ironworks Hiroshima Official Link

• Rust Inhibitor
• paint
• Exterior coating materials

At Harada Ironworks, we are equipped with large blast facilities. We also keep polishing materials that can be used on stainless steel, allowing us to remove rust even when it has spread extensively and deeply. The surface after blasting has a subdued luster without shine, making it less prone to reflections, fingerprints, and scratches. Mild rust can be easily removed at home! For more details, please see the related links below. Moreover, rust transfer can be easily prevented by painting! We have extensive experience in both stainless steel blasting and painting, so please feel free to consult us. For more details, please see the related links below.

• Rust Inhibitor
• paint
• Exterior coating materials

Harada Tekkou offers comprehensive services from surface preparation blasting to painting! If you are unsure about what to choose for surface preparation (the process of changing the surface to a state suitable for painting) or painting specifications, please consult us, and we will select the optimal specifications for you. Website: https://harada-tekkou.co.jp/ YouTube: https://www.youtube.com/@hara-tetu Facebook: https://fb.com/haradatekkou.hiroshima Instagram: https://www.instagram.com/haradatekkou_hiroshima/ Harada Tekkou is one of the largest anti-corrosion painting specialized factories in the Chugoku region. To prevent rust and ensure products are used beautifully and for a long time, we have large-scale blasting equipment dedicated to surface preparation and an indoor painting factory. For over 80 years since our founding, we have handled the painting of various metal products. We excel in surface preparation and painting for products installed indoors and outdoors, as well as those exposed to harsh environments such as offshore, underwater, and coastal areas.

• Rust Inhibitor

"What is stainless steel?" It is a special steel made to enhance corrosion resistance compared to ordinary carbon steel. "Characteristics of stainless steel" The biggest feature of stainless steel, unlike regular steel, is that it contains chromium. Chromium combines with oxygen to create a "passivation film" known as chromium oxide. Because it is covered by this passivation film, it is less likely to rust compared to ordinary carbon steel. However, this does not mean it is "rust-proof" or "degradation-proof." It can still rust due to factors such as moisture, salt, scratches, dirt, and contact with other types of metals that can cause rust transfer. "Painting on stainless steel is possible!!" By applying paint, the characteristics and performance of stainless steel can be enhanced, giving it beautiful colors and making it "more rust-resistant and beautiful stainless steel." Please refer to the links below for painting methods and related information.

• Rust Inhibitor

What is SS400? In JIS (Japanese Industrial Standards), there is a specification for rolled steel materials known as general structural rolled steel. General structural rolled steel is represented by the material symbol SS, and since the minimum tensile strength is 400 MPa, it is called "SS400." It is widely used across various fields, making it a steel material that is abundant in supply and inexpensive to obtain. It is characterized by being easy to machine and weld, and it has high versatility. On the other hand, it is a relatively soft material among steels, making it difficult to use in areas that require high strength, and it is prone to rust, necessitating anti-rust treatment. Therefore, some form of rust prevention treatment is required. Additionally, during the manufacturing process of the steel, the surface becomes covered with "scale" (mill scale) formed by the combination of high temperatures and oxygen, and if the scale is not removed, the anti-rust treatment will not last long. There are two methods for removing scale: "pickling" and "blasting," with "blasting" being superior for preventing rust over a longer period. By completely removing all foreign substances like scale through blasting and applying anti-rust treatment to the formed surface, SS400 can resist rust for an extended period.

• Rust Inhibitor
• paint
• Exterior coating materials

"Airless Spray and Air Spray" The most widely used painting method is painting with a "spray gun." Both airless spray and air spray are types of spray guns. Products painted with a spray gun include vehicles such as cars, motorcycles, and boats, large infrastructures like bridges and transmission towers, and many everyday items like furniture and appliances. By utilizing the force of compressed air, the paint is atomized into a fine mist and sprayed. These two methods differ significantly in how they atomize the paint. "Airless Spray" applies pressure to the paint using air and discharges only the paint. "Air Spray" applies air to the paint and discharges both the paint and air together. [What is Painting? - About the Painting Process] https://www.nc-net.or.jp/company/98405/product/detail/188904/ [Basics of Painting: Tools and Methods for Painting] https://www.nc-net.or.jp/company/98405/product/detail/205301/

• Rust Inhibitor
• paint
• Exterior coating materials

"Surface preparation" is the process of transforming the "substrate," which is in its uncoated state, into a surface suitable for painting. "Undercoat treatment" is the process of transforming the "undercoat," which has already been painted or treated, into a surface suitable for painting. Both involve the work of changing the "surface of the object to be painted into a state suitable for painting," but the condition before the work is different. Additionally, surface preparation primarily involves polishing and degreasing, while undercoat treatment includes repairing deteriorated surfaces with primer painting and putty. However, in practice, both "surface preparation" and "undercoat treatment" are often listed in specifications without distinction! It may be better not to overthink it and to understand both as meaning "transforming into a surface suitable for painting." For more details on "methods of surface preparation and undercoat treatment," "the importance of surface preparation and undercoat treatment," and "standards for surface preparation and undercoat treatment," please refer to the related links below.

• Rust Inhibitor
• paint
• Exterior coating materials

The products painted at Harada Iron Works are often used in environments that "cannot withstand normal painting." In environments such as offshore, underwater, and on the water, simply applying paint over metal will cause the coating to peel off within a few years. Corrosion progresses from the areas where the paint has peeled, rendering the product unusable almost immediately. Additionally, in such locations, it is difficult to perform repair painting, so a "protective coating" that can last as long as possible is required. Harada Iron Works has been providing "coatings that can withstand harsh environments" for 80 years. With our complete blasting facilities and indoor painting equipment, there is no need to worry about "return rust" after blasting treatment. Moreover, painting on stainless steel, which is considered difficult, becomes possible through blasting processing! By applying paint, we can enhance the characteristics and performance of stainless steel, add beautiful colors, and create "more rust-resistant, beautiful stainless steel." 【Is painting on stainless steel possible? Impossible? About that method】 https://www.nc-net.or.jp/company/98405/product/detail/197530/

• Rust Inhibitor
• paint
• Exterior coating materials

"SSPC SP-3" SSPC is a non-profit organization in the United States that specializes in coatings for the protection of industrial and marine structures. It is one of the standards established for surface preparation. Surface treatment is performed using power tools such as sanders, wire brushes, chipping hammers, and needle guns. Harmful substances such as loosely adhered rust, mill scale, and paint films on the surface are removed, but firmly adhered rust, mill scale, and paint films are allowed. Visual inspection is conducted. [Summary of SSPC Standards] https://www.nc-net.or.jp/company/98405/product/detail/208826 "Benefits of Using SSPC SP-3" SSPC SP-3 is the standard for surface preparation when using power tools. Since blasting requires equipment and generates dust and noise, it is selected in cases where it is difficult to consider the surrounding environment. Additionally, SP-3 may be used for surface preparation when correcting partially damaged paint. While it is a convenient method that does not require equipment, it cannot remove firmly adhered rust, mill scale, or paint films.

• Exterior coating materials

"About Stainless Steel" It is an alloy primarily composed of iron (Fe) and chromium (Cr). Chromium combines with oxygen to create a "passivation film" known as chromium oxide. Because it is covered by this passivation film, it has higher corrosion resistance and is less prone to rust compared to ordinary carbon steel. "Reasons Why Stainless Steel Paint Peels Easily" - Smooth Surface The surface of stainless steel is very smooth, so the paint cannot adhere sufficiently and ends up peeling off. - Presence of Chromium Oxide The chromium contained in stainless steel combines with oxygen to form chromium oxide, which protects the surface with a thin film. This film hinders the adhesion of the paint, making it more likely to peel off. 【Types of Metal Coatings and How to Choose】 https://www.nc-net.or.jp/company/98405/product/detail/196154/ 【List of Common Coating Defects: Causes and Countermeasures】 https://www.nc-net.or.jp/company/98405/product/detail/192232/

• Rust Inhibitor
• paint
• Exterior coating materials

List of SSPC Standards 'SSPC-SP5 / NACE No.1' White metal blast cleaning 'SSPC-SP10 / NACE No.2' Near-white metal blast cleaning 'SSPC-SP14 / NACE No.8' Industrial blast cleaning 'SSPC-SP6 / NACE No.3' Commercial blast cleaning 'SSPC-SP7 / NACE No.4' Brush-off blast cleaning 'SSPC-SP16' Brush-off blast cleaning 'SSPC-SP11' Power tool cleaning to bare metal 'SSPC-SP15' Commercial grade power tool cleaning 'SSPC-SP3' Power tool cleaning 'SSPC-SP2' Hand tool cleaning 'SSPC-SP1' Solvent cleaning For more details, please refer to the related links.

• Rust Inhibitor
• paint
• Exterior coating materials

What is the process of Keren? Keren basically removes foreign substances by grinding or rubbing the surface. For example, it involves polishing the surface with sandpaper or a brush. Additionally, depending on the method of work, it is classified into four types known as Type 1 Keren to Type 4 Keren. What are the four types of Keren? Type 1 Keren... Blast method. A method that involves colliding abrasives at high speed against the surface for grinding. Type 2 Keren... Uses power tools. A method that involves rubbing the surface with tools like grinders. Type 3 Keren... Uses hand tools. A method that involves rubbing the surface with tools like wire brushes. Type 4 Keren... Uses hand tools. A simple cleaning and roughening method using sandpaper. Thus, the types are categorized by the method of work, and the degree of cleanliness is as follows: Cleanliness Low ➩➩➩➩➩➩➩➩➩➩➩➩➩➩ High Type 4 Keren Type 3 Keren Type 2 Keren Type 1 Keren [Difference between Type 1 Keren and Type 2 Keren in terms of stripping] https://www.nc-net.or.jp/company/98405/product/detail/186195/ Harada Iron Works possesses large equipment dedicated to the highest level of Keren, "Blast."

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"Aluminum Coating Method" 1. Surface Cleaning It is necessary to thoroughly remove any oils and dirt that are attached to the surface. If the surface is not cleaned using organic solvents or detergents, the paint will not adhere properly and will peel off, so this step must be done carefully, and the surface must be thoroughly dried afterward. 2. Surface Polishing By polishing the smooth surface of the aluminum and creating fine scratches, the paint can penetrate into these scratches and adhere firmly to the aluminum. This process is also very important as it removes surface oxides, which affects the outcome of paint adhesion. 3. Special Primer If a special paint with good adhesion to aluminum is not used, there is a high possibility that the paint will easily peel off. Additionally, in environments with significant temperature changes, using paint with insulation and heat shielding properties can prevent or reduce paint peeling due to thermal expansion. 4. Uniform Coating After completing the special primer, apply intermediate and top coats suitable for the usage environment. Adhere to the appropriate drying times specified by the paint manufacturer and ensure that the paint has fully cured before applying additional layers. When painting, it is necessary to ensure that the paint film has a uniform thickness. An uneven paint film thickness can lead to areas that are prone to peeling, so caution is advised.

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Only the exterior of the product was treated. By removing all detachable parts for treatment, we were able to achieve a uniform finish. The exterior included stainless steel and plastic resin components, but we ensured adhesion by performing surface preparation with blasting and applying a special primer that is compatible with both SUS and PP. Although I was concerned about the strength of the cooler box's plate thickness and adjusted the blasting process accordingly, there was absolutely no deformation with this product! Once the surface preparation was complete, we immediately proceeded to the painting process. We applied a special primer and finished with a black urethane resin in a semi-gloss (30% gloss). The semi-gloss coating can result in color unevenness if too thin and excessive gloss if too thick, making it a challenging paint job, but thanks to the skill of the craftsmen, we achieved a beautiful and uniform semi-gloss finish. The customer's preference was for a matte black finish; however, a completely matte finish has the drawback of having a rough surface that easily collects dirt and is difficult to clean. Since coolers are often used outdoors, we proposed a semi-gloss finish to ensure they could be used in a clean condition for a long time, and we painted it accordingly. Stainless steel materials like SUS304, which are said to be difficult to paint, pose no problem for Harada Ironworks.

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• paint
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**Differences Between Type 1 and Type 2 Keren in Paint Stripping** Paint stripping was performed using Type 1 and Type 2 Keren. When we magnify the surface after processing, there is a significant difference. [See image] What exactly is Keren? It is introduced in the link below: [What is Keren often heard in painting? Purpose and types] https://www.nc-net.or.jp/company/98405/product/detail/196279/ **About Keren Work** The most important aspect of painting is substrate preparation. Substrate preparation, also known as "Keren," can be divided into four types: Type 1 Keren to Type 4 Keren, depending on the work content and processing method. All methods aim to change the surface to a state more suitable for painting, but there is a significant difference in the finish between Type 1 Keren and Type 2 Keren, as shown in the photos. In metal painting, the lifespan of the paint is said to be around 10 to 50 years at most. What influences this paint lifespan is not the type or quality of the paint or the painting technique, but the processes before painting. The method of substrate preparation is the cause that affects paint lifespan. Type 1 Keren or Type 2 Keren accounts for about 50% of the difference in paint lifespan.

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• paint
• Exterior coating materials

"What is film thickness?" Film thickness refers to "the thickness of the coating film after the paint has fully cured," and is expressed in the unit of μ/µm (microns/micrometers). 1μm = 0.001mm, which is an extremely fine unit. In general machine painting, at Harada Ironworks, the following film thicknesses are common: For primer only: 15µm to 75µm Up to topcoat: 300µm to 500µm The degree of reduction varies depending on the type of paint and the environment in which it is used, but film thickness gradually wears down each year and decreases. Therefore, a film thickness of just 10μm or 100μm can significantly change the durability. However, it is not simply the case that a thicker film is better! Each type of paint has a specified film thickness at which its protective capabilities are maximally exhibited (refer to the paint specifications from each manufacturer). The best approach is to form a coating film with an appropriate thickness that is neither too thick nor too thin! It is extremely important not only to paint but also to manage the film thickness properly and maintain it within the appropriate values! At Harada Ironworks, we have painted many products under strict film thickness management. If you have any concerns regarding painting, please feel free to consult us.

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**What is Can Manufacturing?** Can manufacturing has two meanings: 1. The production of cans such as canned food and canned juice. 2. The process of cutting and welding metal to create products. This time, I will explain can manufacturing in the sense of producing products, which is also carried out by Harada Ironworks. To transform metal into products, the material is processed by cutting and bending to shape it, followed by welding and assembly to create three-dimensional products. This entire process is referred to as can manufacturing. **Flow of Can Manufacturing Process** 1. Creating drawings 2. Cutting 3. Bending 4. Tack welding and final welding 5. Finishing and distortion correction 6. Machining 7. Surface preparation and painting 8. Assembly **Summary** Transforming metal into products. "Can manufacturing" refers to the process of cutting and bending metal to shape it, followed by welding and assembly to create three-dimensional products. In reality, there are many more processing methods, and the enjoyment lies in selecting them while engaging in manufacturing. For more details, please visit 'What is Can Manufacturing? - Introducing the Flow of Can Manufacturing Process' at https://www.nc-net.or.jp/company/98405/product/detail/182555.

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What is ISO?" ISO is a non-governmental organization headquartered in Geneva, Switzerland, aimed at establishing internationally common standards. The standards are classified based on surface cleanliness (rust removal) and construction methods. "Standards for Surface Preparation according to ISO" The standards for surface preparation according to ISO are divided into six types. Among them, the widely used ones are summarized below regarding "work methods" and "points to note." [ISO St3] Surface preparation using power tools https://www.nc-net.or.jp/company/98405/product/detail/227861/ [ISO St2] Surface preparation using hand tools https://www.nc-net.or.jp/company/98405/product/detail/228939/ The remaining four are listed under "Basic Information.

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• Exterior coating materials