... steel, and die steel as requirements. High quality with competiti special steel square barsSpecification:Precisely-forged square bar 20mm -150mmHot-rolled ... (DIN), SKH51(JIS)Chemical Composition: C 0.85, Si 0.38, Mn 0.35, P≤0.030, S≤0.030, Cr ... HRCApplication: Steel for pressing mold, extrusive mold and tensile mold special steel square bar