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What is JIS G3131 SPHD Steels? JIS G3131 SPHD refers to high strength hot rolled mild steel grades per Japanese Industrial Standard G3131. SPHD stands for “Steel Plate for High Strength Bridge and Common Structures”. These perform better than SPHC grades in critical applications. https://shangangsteelsupply.com/hot-rolled-mild-steel-jis-g3131-sphd/