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JIS G3131 SPHD (Hot-Rolled Steel Sheets and Coils) is another Japanese standard that specifies the standards for hot-rolled steel sheets and coils with specific chemical composition and mechanical properties. SPHD is similar to SPHC but has slightly different chemical composition requirements. Here are some key features of JIS G3131 SPHD: Chemical Composition SPHD steel has a specified chemical composition, including elements such as carbon, manganese, and other alloying elements. The exact composition is defined in the JIS G3131 standard. https://shangangsteelsupply.com/jis-g3131-sphd-steel-sheet-coil/