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ANSWER: JIS G3131 SPHF steel is the hot rolled mild steel plates, mild steel sheet, mild steel strip.
SPHF pickled steel is under the Japanese standard JIS G3131. SPHF mild steel is processing quality, the thickness range of SPHF is from 1.4mm to 8mm. The Carbon chemical composition of SPHF is max 0.08%. The tensile strength of SPHF steel is min 270 MPa. The elongation of SPHF steel is min 37%.