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ASTM A 320-2000
Chemical Composition (%)
Material Designation 碳C 硅Si 锰Mn 磷P 硫S 硼B
L7、L7M、L70 (4140、4142、4145) 0.38~0.48 0.15~0.35 0.75~1 0~0.035 0~0.04 -
L7A、L71 (4037) 0.35~0.4 0.15~0.35 0.7~0.9 0~0.035 0~0.04 -
L7B、L72 (4137) 0.35~0.4 0.15~0.35 0.7~0.9 0~0.035 0~0.04 -
L7C、L73 (8740) 0.38~0.43 0.15~0.35 0.75~1 0~0.035 0~0.04 -
L43 (4340) 0.38~0.43 0.15~0.35 0.6~0.85 0~0.035 0~0.04 -
L1 0.17~0.24 0.15~0.3 0.7~1.4 0~0.035 0~0.05 0.001~0.003
For Reference Only