... High creep strength steel solid round bar (4140/42CrMo4/1.7225) 1.Hardness of annealing: HBS≤230 2.chemical composition HuateCMnCrMoNiPSSiAISIDINJIS42CrMo0 ... .38-0.450.50-0.800.90-1.200.15-0.25≤0.030≤0.035≤0. ... strength, large parts of the important sectional dimensions, such as axis, gear, connecting rod, transmission gears, the supercharger gear, engine ...