JIS G3114 SMA490BW Weathering Steel Strong, Sustainable

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JIS G3114 SMA490BW Weathering Steel

SMA490BW is a high-strength weathering structural steel that provides an excellent balance between durability, weldability, and mechanical toughness. Unlike conventional carbon steel, which requires protective painting or coating, SMA490BW naturally develops a protective oxide film (patina) when exposed to alternating wet and dry conditions. This oxide film acts as a stable barrier against further corrosion, meaning the steel can achieve a long service life with significantly reduced maintenance.

Because of its optimized mechanical performance, including a minimum yield strength of 365 MPa and tensile strength ranging from 520–680 MPa, SMA490BW is widely employed in civil and industrial construction projects where both strength and durability against environmental conditions are critical.

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