Japan Iron and Steel Federation

Tel: +81 3 3669 4815
Website: https://www.jisf.or.jp/en/

Contact Japan Iron and Steel Federation

Weathering Steel for Bridges

Japan Iron and Steel Federation – Japan

• By adding elements such as Cu, Cr, and Ni that are effective in improving weather resistant performance, a protective rust is formed on the surface of the steel material, suppressing the progression of corrosion.
• It could be used without painting, eliminating the need for repainting and reducing life cycle costs (LCC).
• JIS-based weathering steel (SMA, SBHS-W) could be used in hot and
  humid Japanese corrosion environments where the airborne salt content is 0.05mdd or less.
• There are two types of JIS-based weathering steels :
  JIS G 3114 Hot-rolled atmospheric corrosion resisting steels for
  welded structure [ SMA400W, SMA490W, SMA570W ] and JIS G 3140 Higher yield strength steel plates for bridges (SBHS) [ SBHS400W, SBHS500W, SBHS700W ].
• Japanese steel making companies have developed and commercialized high nickel type weathering steels that can withstand higher levels of airborne salt (0.05 mdd or more).

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Characteristics

• Self- Protective Rust Formation
  – The addition of Cu, Cr, and Ni in weathering steel forms a dense rust layer that suppresses corrosion and minimizes thickness loss.
• Paint-Free Durability
  – In suitable environments, weathering steel requires no coating due to its minimal corrosion-induced thickness reduction.

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Categories

Restoration Solution, Road & Bridge