ナカジマ鋼管 List of Products and Services

The "Super Hot Column" is a hot-formed rectangular steel pipe that does not undergo work hardening during heating and uniform heating, resulting in a uniform cross-section of the steel pipe and achieving material properties equal to or greater than SN materials. It enables the economical design of high-quality buildings while simultaneously enhancing the reliability of structures during earthquakes. Its characteristics have been highly evaluated, and it has received certification as a designated construction material by the Minister of Land, Infrastructure, Transport and Tourism as an earthquake-resistant structural steel pipe, as well as the Science and Technology Agency Director's Award. 【Features】 ■ Uniform hardness distribution in all parts due to hot forming ■ Excellent elongation capability ■ Minimal residual stress and high buckling strength ■ Sufficient toughness in all parts with high Charpy values ■ Excellent weldability with no special management required *For more details, please contact us or download the catalog.

• Steel sash

"N Column BCR/BCP" is a cold-formed rectangular steel pipe that achieves high quality at low cost, providing a rational and economical solution. It is strong against bending, twisting, and compression, allowing for sufficient strength with lightweight steel materials. Additionally, due to its high strength, it is possible to reduce the outer diameter of the column, thereby increasing the effective floor area. Because of its square cross-section, there is no need to brace reinforce the weak axis like in H-shaped columns. 【Features】 ■ Rational cross-sectional performance as a column material ■ High efficiency of floor area ■ No wall braces required ■ Easy and economical processing and finishing ■ Sophisticated shape *For more details, please refer to the catalog or feel free to contact us.

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The "N Column/NBCP325EX" is a highly tough column that guarantees a Charpy absorption energy of over 70J in both flat and corner sections. It uses EzWELD steel from Sumitomo Metal Industries, which allows for the removal of design restrictions imposed on cold-formed square steel pipes even when applying conventional lamination methods. Additionally, when using EzWELD steel from Sumitomo Metal Industries for the diaphragm (including base plate and top plate) and welding materials, the heat input and interpass temperature restrictions are relaxed, improving welding efficiency. 【Features】 ■ High performance ■ High quality and low cost ■ Rational and highly economical ■ Widely adopted in steel structures ■ Certified by the Minister of Land, Infrastructure, Transport and Tourism *For more details, please refer to the catalog or feel free to contact us.

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"NBCP385" is a high-performance (550N/mm² class) cold-pressed square steel pipe that achieves excellent seismic performance. It guarantees a Charpy absorbed energy of over 70J in the flat part. 【Features】 ■ High quality and low cost ■ Rational and highly economical ■ Achieves excellent seismic performance ■ High performance (550N/mm² class) ■ Certified by the Minister of Land, Infrastructure, Transport and Tourism *For more details, please refer to the catalog or feel free to contact us.

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The SHC275B/C-EN and SHC355B/C-EN are hot-formed rectangular steel pipes that are processed to shape after heating and equalization, preventing work hardening, resulting in a uniform cross-section and achieving material properties equal to or greater than SN materials. By utilizing hot forming technology, the standard strength is enhanced, and toughness is guaranteed to be over 100J across the entire cross-section. Due to the increased standard strength, using SHC-EN allows for a reduction in column weight. 【Features】 ■ Excellent elongation capability ■ High buckling strength ■ Minimal residual stress ■ Uniform hardness across the entire cross-section ■ Compliant with European standards *For more details, please refer to the catalog or feel free to contact us.

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The "SHCK409B/C" is a hot-formed rectangular steel pipe that maintains its standard strength (F value) even when the plate thickness exceeds 40mm. It allows for significant cost reductions compared to four-sided welded box columns. Additionally, there is no variation in quality or residual reactions due to welding, and it is made from SN490 grade steel, resulting in a high-quality and low-cost column material. 【Features】 ■ Maintains standard strength (F value) even when the plate thickness exceeds 40mm ■ Significant cost reductions possible ■ High quality and low cost ■ Certified by the Minister of Land, Infrastructure, Transport and Tourism *For more details, please refer to the catalog or feel free to contact us.

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The sectional performance of square steel pipes measures how much load, such as forces applied from above, the column can withstand, how much it can bend under bending forces, and how well it can endure impacts. It can be broadly divided into sectional area, sectional second moment, and sectional coefficient. Each of these values varies depending on the specifications and sizes of the column (large-diameter square steel pipe) and can be confirmed in product brochures. The sectional area is proportional to the strength of the column material. In the case of column materials, it is used in the calculation of the compressive stress of the column, and generally, the larger the area, the more it can withstand compressive forces applied from above. Additionally, we will introduce the relationship between sectional performance and specifications/manufacturing methods. *Detailed information about the column can be viewed in the PDF materials.

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"Structural calculation" refers to the process of calculating the weight of the building itself and loads when constructing a building, as well as determining whether it can withstand not only the Earth's gravity but also earthquakes and typhoons. The term "route" refers to the method (rules) of calculation. Typically, calculations are performed using specialized software. The routes for structural calculations are defined by the Building Standards Act, and the details must be submitted to the building administrator or a designated inspection agency to confirm compliance with the standards of the Building Standards Act and other regulations. This is referred to as "building confirmation." There are three types of calculation methods: Route 1, Route 2, and Route 3. *For detailed content of the column, please refer to the PDF document.*

• Architectural Design Software

In steel frame (S) construction, the column material is primarily large-diameter square steel pipes known as "columns." However, there is a size limit, with a maximum manufacturing size of 1000mm. For super high-rise buildings that require larger sizes, a "four-sided box," also known as a welded four-sided box or box column, is used. In Japan, column materials for construction structures predominantly use columns, whereas in Taiwan, four-sided boxes are more common. Like Japan, Taiwan experiences frequent earthquakes and requires high strength, but there are fewer column manufacturers, and there are steel manufacturers that produce thick plates, which likely leads to a greater use of four-sided boxes. *For more detailed information about columns, please refer to the PDF materials.*

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When selecting column materials for architectural structures, the first thing to know is the types of square steel pipes. They can be broadly classified into small diameter, medium diameter, and large diameter, with large diameter square steel pipes primarily used for construction purposes. Small diameter square steel pipes, referred to as "small square" or "small square pipes," are used for furniture, decorative materials, and machine parts. Each manufacturer shapes round pipes according to the JIS standard STKM (JIS G 3455) into square shapes and sells them under their own standards. Medium diameter square steel pipes are called "medium diameter square" or "medium diameter square pipes," and are labeled as "general structural square steel pipes." They are used for small-scale architectural structures, structural components of machines, multi-story parking lots, and temporary materials, primarily utilizing the JIS standard STKR (JIS G 3466). Large diameter square steel pipes are generally referred to as "large diameter square steel pipes" or "columns," and are labeled as "architectural structural square steel pipes." The Japan Iron and Steel Federation has product specifications such as BCR and BCP, which are used as column materials for medium to large-scale architectural structures. *For detailed information on columns, please refer to the PDF materials.*

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Nakajima Steel Pipe is a manufacturer that produces cold-formed square steel pipes (STKR, BCR, BCP) as well as hot-formed square steel pipes known as "Super Hot Column (SHC)." Hot-formed square steel pipes are shaped while heated, which imparts the inherent toughness of iron and demonstrates high seismic resistance. They have received certification as designated building materials from the Minister of Land, Infrastructure, Transport and Tourism, and have also obtained the CE mark, which is a compliance mark for European standards. *For detailed information about the columns, please refer to the PDF materials.

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BCP and BCP are both cold-formed square steel tubes used as column materials in steel structures. They have been standardized as column materials equivalent to SN materials by the Japan Iron and Steel Federation and are certified products by the Minister of Land, Infrastructure, Transport and Tourism. There are two types of standards, BCR and BCP, based on differences in manufacturing methods, and this explanation will focus on these differences. *For detailed content of the column, please refer to the PDF document.*

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Cold-formed square steel pipes are, as the name suggests, steel pipes that are formed into a square shape at room temperature. They are mainly used as column materials in steel structures. The characteristics and applications vary depending on the manufacturing methods and standards, and this time we will explain these differences. STKR and BCR are produced through roll forming. In particular, BCR has the advantage of being able to respond more easily to delivery requests due to its production based on forecasts. Additionally, BCP is manufactured through press forming and can accommodate large sizes. The properties of the flat plate section change very little from the base material, and it is characterized by having the same mechanical properties as SN materials. *For detailed information on the columns, please refer to the PDF document.

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Large-sized square steel pipes used for construction are referred to as "columns." Since our company successfully mass-produced large-diameter square steel pipes in 1978, they have become the mainstream material for steel frame columns. They are used as columns in medium to large-scale buildings and are categorized into several types based on standards and manufacturing methods. General structural square steel pipes conforming to JIS standards, which are manufactured through roll forming, include STKR400 and STKR490. STKR is said to be an abbreviation for "S = Steel, T = tube, K = groove, R = Rectangular," with the numbers indicating the minimum tensile strength. *For more detailed information about columns, please refer to the PDF document.

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Square steel pipes are literally steel pipes with a square cross-section. The sizes of the cross-section vary widely; smaller ones are used as components for furniture, while larger ones are used as columns in large-scale buildings, making the applications of square steel pipes truly diverse. They can be classified into three categories based on size: small diameter, medium diameter, and large diameter. Smaller sizes are referred to as "pipes," while larger sizes, especially those used in construction, are called "columns." Our company specializes in the development and manufacturing of "columns" among square steel pipes. *For more details about columns, please refer to the PDF document.*

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