Certified Reliable Choice JIS G3114 SMA490BW Weathering Steel

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JIS G3114 SMA490BW Weathering Steel

 

 

 

 

 

 

SMA490BW is a high-strength, low-alloy structural steel defined by the Japanese Industrial Standard (JIS) G3114. The "SMA" indicates it's a welded structural steel, "490" denotes its minimum yield strength of 490 MPa, and the "W" signifies its weathering characteristics.

 

The true genius of SMA490BW lies in its chemical composition. Unlike ordinary steel, which forms a porous and flaky rust (hydrated iron oxide) that continually falls away and exposes fresh steel to further corrosion, weathering steel forms a dense, adherent protective oxide layer on its surface. This layer, often called the "patina," acts as a barrier, dramatically slowing down the rate of further atmospheric corrosion. This patina is "self-healing"; if scratched, it will reform in the presence of wet-dry cycling, protecting the underlying steel.

 

 

 

 

 

 

 

 

 

 

 

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