Special aluminum alloy layer provides excellent properties to bolts! Guarantees material strength that withstands re-tightening.
"Sunaltech" is a surface treatment that generates an aluminum + iron alloy layer primarily aimed at countering salt damage, preventing burning, and resisting high-temperature oxidation and corrosion. The re-surface is covered with an oxide film (Al2O3), which is scientifically stable and provides high corrosion resistance. Bolts treated with this process maintain the strength of the material and can sufficiently withstand increases in axial force due to tightening, allowing for safe use. 【Features】 ■ Excellent corrosion resistance (atmospheric and seawater) ■ Prevention of stress corrosion cracking (can also be applied to stainless steel) ■ Reduces bolting work during maintenance by half ■ High-temperature oxidation resistance by preventing oxygen penetration into the base material ■ Maintains high dimensional accuracy due to diffusion penetration ■ Weldable, resistant to sulfide, and prevents stress corrosion cracking *For more details, please refer to the catalog or feel free to contact us.
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【Performance】 ■Yield Strength (above 725): 859.0 N/mm² ■Tensile Strength (above 860): 987.5 N/mm² ■Elongation (above 16): 19.2% ■Reduction of Area (above 50): 63.0% ■Hardness: 302 HB Thickness of Treatment Layer: 10–40 μm Hardness of Treatment Layer: Hv 800 or above *For more details, please refer to the catalog or feel free to contact us.
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For more details, please refer to the catalog or feel free to contact us.
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Sanwa Iron Works Co., Ltd. is committed to the spirit of "no compromise" based on ISO 9001 as the foundation of our quality management. We are all working together to manufacture and sell stud bolts, special steel bolts, and nuts, while also striving to develop products that connect to the future. Furthermore, we aim to contribute broadly in the fields of petroleum and petrochemical facilities, nuclear power, earthquake resistance, and environmental-related areas, with the mindset of everyone being in sales and everyone being in technology, as we aspire to be a cornerstone in Japanese and global industries.