JG/T5011.4-92表3铸件抗拉强度铸件壁厚mm最小抗拉强度牌分Ou大于至MPa2.510130HT100101002030903050802.510175HT150101453013030501202.510220HT2001020195203017030501604.010270HT2501020240203022030502001020290HT300203025030502301020340HT35020302903050260注:当一定牌号的铁水浇注壁厚均匀而形状简单的铸件时,因壁厚不同面造成的抗拉强度的变化,可从本表查出参考数据。当铸件壁厚不均匀,或有型心时,本表仅能近似给出不同壁厚处的大致抗拉强度值。表4灰铸铁硬度牌号硬度快等件上的硬度范围HBH145最大不超过170H175150200H195170220H215190240H235210260H25523028032