Imparts excellent properties to bolts with a special aluminum alloy layer! 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-surfaced layer is covered with an oxide film (Al2O3), which is scientifically stable, providing 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 more *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 areas such as petroleum and petrochemical facilities, nuclear power, earthquake resistance, and environmental concerns, with a mindset of "everyone in sales, everyone in technology," and we are determined to be a cornerstone in both Japanese and global industries.