Abstract: Steel 30Cr2Ni4MoV (% ： 0. 15 ~ 0. 16C, 0. 03 〜0.45Si, 0. 12 〜0. 14Mn, 0. 005 P, 0. 005 〜0.006S, 1. 62 ~ 1. 72Cr, 3. 60 〜3. 63Ni, 0. 52 〜0. 53Mo, 0. 07V, ≤0.005Al) is melted by a 10 kg vacuum induction furnace, forged bar treaded at 930 °C air cooling + 900 °C air cooling +640 °C air cooling, then water quenched at 850 ℃ following tempered at 600 ℃. Examination results show that as the Si content in steel increases from 0. 03% to 0. 45%, the amount of martensite in steel increases and the grains become coarser ； and the tensile and yield strength of steel increase respectively from 922 〜936 MPa and 868 〜873 MPa to 1 015 〜1 028 MPa and 950 〜959 MPa, while the average impact energy of steel decreases from 205 J to 154 J.

Key words:  , Ultra Supercritical Steam Turbine Rotor Steel 30Cr2Ni4MoV, Si Content, Structure, Mechanical Properties

摘要： 30Cr2Ni4MoV钢(%:0.15～0.16C、0.03～0.45Si、0.12～0.14Mn、0.005P、0.005～0.006S、1.62～1.72Cr、3.60～3.63Ni、0.52～0.53Mo、0.07V、≤0.005A1)由10kg真空感应炉冶炼,锻后经930℃空冷+900℃空冷+640℃空冷处理,再经850℃水淬+600℃回火调质处理。试验结果表明,当钢中的Si含量由0.03%增加至0.45%时,钢中马氏体量增加,晶粒更为粗大;钢的抗拉和屈服强度分别从922～936 MPa和868～873 MPa增至1015～1028 MPa和950～959 MPa,但平均冲击功由205 J降至154 J。

关键词: 超超临界汽轮机转子钢30Cr2Ni4MoV,  , Si含量, 组织, 力学性能