Abstract: The forging of steel 30CrMoA (/%: 0. 30C, 0.21 Si, 0. 53Mn, 0. 003S, 0. 005P, 0. 98Cr, 0.22Mo, 0. 06 V) for Desander is a tubular stock with outside diameter Φ405 ~493 mm and inside diameter Φ90 - 167 mm and in specification the transverse impact energy of quenched-tempered steel at -40 °C is ≥20 J. With conventional normalizing + quenching+ tempering process: 920 ℃ normalizing (fan cooling) +880 °C normalizing (fan cooling) +860 ℃ quenching (air cooling + water cooling) +630 ~680 ℃ tempering ( air cooling) the transverse R_m of steel is 715 ~815 MPa, R_p0.2  545 〜665 MPa, A 19% ~20% , Z 65% ~68% , ambient A_kv 36 ~ 101 J and -40 %： A_kv 11 ~21 J； with equilibrium phase diagram calculated by Thermo-calc software and calculated A_c3 value of steel t the optimum normalizing + quenching+ tempering process has been defined that is 950 °C normalizing ( fan cooling) + 820 ℃ quenching (air cooling + water cooling) + 660 ~670 ℃ tempering (air cooling) , and with the optimum process the transverse mechanical properties of steel are R_m 685 〜700 MPa, R_p0.2 500 〜525 MPa, A 21% 〜22% , Z63% 〜66% , ambient A_kv 65 ~ 114 J and -40 °C A_kv 23 〜28 J, all meet the requirement of specification for the steel.

摘要： 30CrMoA钢(/%:0.30C、0.21Si、0.53Mn、0.003S、0.005P、0.98Cr、0.22Mo、0.06V)除砂器锻件为外径Φ405～493 mm内径Φ90～167 mm的管状工件,技术条件要求调质后-40℃横向冲击功≥20 J。经常用正火+调质工艺920℃正火(风冷)+880℃正火(风冷)+860℃淬火(空冷+水冷)+630～680℃回火(空冷)后横向Rm715～815 MPa,Rp0.2 545～665 MPa, A 19%～20%,Z 65%～68%,室温A_kc 36～101 J,-40℃ A_kv 11～21 J; 通过Thermo-calc软件计算得出该钢平衡相图及计算的Ac3温度确定优化调质工艺950℃正火(风冷)+820℃淬火(空冷+水冷)+660～670℃回火(空冷),其横向力学性能为R_m 685～700 MPa,Rp_0.2 500～525 MPa, A 21%～22%,Z 63%～66%,室温A_kv 65～114 J,-40℃ A_kv 23～28 J,均符合技术条件要求。