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What is JIS G3131 SPHC Steels? JIS G3131 SPHC steels refer to the hot rolled mild steel grades covered under the Japanese Industrial Standard G3131. SPHC stands for “Steel Plate for Highway Bridges and Common Structures”. These are plain carbon steels commonly used for general structural applications in Japan. https://shangangsteelsupply.com/hot-rolled-mild-steel-jis-g3131-sphc/