力学性能（最小值）牌号QT400-18QT400-15QT450-10QT500-7QT550-6QT600-3QT600-5QT700-3QT800-2QT900-2HT250QTD800-10QTD900-840MnBZG25ZG35ZG45ZG55抗拉强度Rm(min)Mpa4004004505005506006007008009002258009009804404905700 屈服强度Rp0.2(min)Mpa250250310320350370370420480600500600785240270310340伸长率A(min)%18151076353221081020161210布氏硬度HBW(调质后）130-175135-180160-210170-230180-250190-270190-270225-305245-335280-360180-230250-310270-340铸铁单铸试块力学性能要求
力学性能（最小值）牌号40Cr40Mn245Cr102035Q235AQ275AQ345AZG230-450ZG270-500抗拉强度Rm(min)Mpa9808851030331051059037170 屈服强度Rp0.2(min)Mpa785735835205245305335235275345伸长率A(min)%910924201714252220布氏硬度HBW(调质后）255-285223-2170-217170-217
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