4保证淬透性结构钢和低淬透性结构钢
45H 45AH 15CrH 15CrAH 20CrH 20CrAH 20Cr1H 20Cr1AH 40CrH 40CrAH 45CrH 45CrAH 15CrMoH 15CrMoAH 20CrMoH 20CrMoAH 22CrMoH 22CrMoAH 42CrMoH 42CrMoAH 16CrMoH 16CrMoAH 20CrMnH 20CrMnAH 15CrMnBH 15CrMnBAH 17CrMnBH 17CrMnBAH 40MnBAH 40MnB 45MnBH 45MnBAH 20MnVBH