~0.8Р0.5~0.8Р0.6~0.9Р<0.03Р<0.15РHT200Р珠光体90%中片状,铁素体少于5%,二元磷共晶体少于4%Р3.2~3.5Р3.1~3.4Р3.0~3.3Р1.6~2.0Р1.5~1.8Р1.4~1.6Р0.7~0.9Р0.7~0.9Р0.8~1.0Р<0.3Р<0.12РHT250Р珠光体98%粗片状,二元磷共晶体少于2%Р3.0~3.3Р2.9~3.2Р2.8~3.1Р1.5~1.8Р1.4~1.7Р1.3~1.6Р0.8~1.0Р0.9~1.1Р1.0~1.2Р<0.2Р<0.12РHT300Р珠光体多于98%中细片状,二元磷共晶体少于2%Р3.0~3.3Р2.9~3.2Р2.8~3.1Р1.5~1.8Р1.4~1.7Р1.2~1.5Р0.8~0.9Р0.9~1.1Р1.0~1.2Р<0.15Р<0.12РHT350Р珠光体95%粗片状,二元磷共晶体少于1%Р2.8~3.1Р2.8~3.1Р2.8~3.0Р1.3~1.6Р1.2~1.5Р1.1~1.4Р1.0~1.3Р1.0~1.3Р1.1~1.4Р<0.15Р<0.10Р2.2.2灰口铸铁的力学性能Р表2-2灰口铸铁的力学性能Р牌号Р金相组织Р/MpaР抗拉强度Р/MpaР弯曲强度Р/MPaР硬度Р/HBSРHT100Р铁素体Р≥100Р≥260Р≤150РHT150Р铁素体+珠光体Р≥150Р≥330Р150~200РHT200Р珠光体Р≥200Р≥400Р170~220РHT250Р珠光体Р≥250Р≥470Р190~240РHT300Р孕育铸铁Р≥300Р≥540Р210~260РHT350Р孕育铸铁Р≥350Р≥610Р230~280РHT400Р孕育铸铁Р≥400Р≥680Р207~269Р(字母“HT”+数字(最小抗拉强度))