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、                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     牌号 Designation 化学成份  Chemical Composition(%) 机械性能 Mechanical Properties of Prouducts   金相组织 Microstructure C Si Mn Cr Mo Ni Cu S P Ak/cm6 HRC abMpa ZG 20Cr 26Ni 5 ≤0.20 ≤2.0 ≤2.0 22～26 ≤0.50 4～6   ≤0.04 ≤0.04     590 A+F ZG 35Cr 26Ni 12 0.2~0.5 ≤2.0 ≤2.0 22～26 ≤0.50 11～14   ≤0.04 ≤0.04     490 A+C ZG 40Cr 25Ni 20 0.35~0.45 ≤2.0 ≤2.0 23~27 ≤0.50 19~22   ≤0.04 ≤0.04     440 A+C