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× 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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