... , and die steel as requirements. High quality with competitive hot rolling square barsSpecification:Precisely-forged square bar 20mm -150mmHot-rolled square ... 0.39, Si 1.10, Mn 0.30, P≤0.028, S≤0.020, Cr 5.10, W ≤0.30,Mo ... : Steel for pressing mold, extrusive mold and tensile mold hot rolling square bars