Quick Answer
Quick Answer
JIS G3114 covers hot-rolled weathering steel plates, sheets, and sections with enhanced atmospheric corrosion resistance through copper, chromium, and nickel alloying. Three strength grades — SMA400, SMA490, and SMA570 — each with A, B, C, and/or W sub-grades, allow designers to balance strength, impact toughness, and surface weathering appearance. SMA490W is the closest Japanese equivalent to ASTM A588 Grade A (Corten) and EN S355W (EN 10025-5).
JIS G3114 (溶接構造用耐候性熱間圧延鋼材 — hot-rolled atmospheric corrosion resisting steel for welded structure) is the Japanese weathering steel standard. The alloying elements copper (Cu), chromium (Cr), and nickel (Ni) promote the formation of a stable, adherent rust patina (錆び — sabi) that acts as a protective barrier, slowing further corrosion at a rate approximately 4–8 times slower than ordinary structural carbon steel in moderate industrial or marine atmospheres. JIS G3114 material is used unpainted on exposed bridges, buildings, and sculptures where the characteristic brown-orange weathered appearance is desired or where long maintenance-free service life is required.
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