壓塊化學成分：

牌號           45           40Cr            20CrMoA

碳C    %      0. 46            0.41                  0.21

矽S i   %      0. 24            0.21                  0.26

錳Mn   %      0. 67            0.67                  0. 53

磷P     %      0.025           0.014                 0.011

硫S     %      0.020           0.006                 0.012

鎳N i    %      0 .02           0.03                  0.05

鉻C r    %      0.08           0.89                  0.86

銅C u    %      0.05           0.05                  0.12

鉛P b    %      0.004          0.003                     /

鉬Mo    %      /              0.01                  0.17

新手教學

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