1、GB/T26653-2011表2力学性能伸长率A牌号抗拉强度Rn屈服强度R布氏硬度HBWMPa(min)MPa(min)%(min)HT200200HT250200一一RuT3003002102140210RuTSi4Mo480400200260QT400-1540025015120180QT400-1840025018120175QT450-1045031010160210QTRSi4Mo520188241QTRSi4Mol550一一200240QTRSi5370一228302QTANi20Cr23702107140255QTANi20Cr2Nb370210140200QTANi223701
2、7020130170QTANi30Cr33702107140200QTANi30Si5Cr5390240170250QTANi35Si5Cr237020010130170注：本表所列数据为单铸试块的力学性能，需本体取样时应在合同中注明。3.4金相组织3.4.1铸件的金相组织见表3。3.4.2当需方有特殊要求时应在产品图样或供货合同中规定，供方应满足要求。表3金相组织牌号金相组织HT2001型石墨70%，石墨大小35级，铁素体5%HT250RuT300铁素体基体，珠光体15%.蠕化率50%RuTSi4Mo铁素体基体，珠光体15%。蛾化率50%QT400-15QT400-18铁素体基体，珠光体15%。球化级别不低于3级，石墨大小为57级QT450-10QTRSi4Mo铁素体基体，珠光体15%，球化级别不低于3级，石墨大小为57级铁素体基体，珠光体15%（铸态供货时珠光体20%），球化级别不低于3级，石墨大小QTRSi4Mol为5一7级
