高强度耐热钢40CrMoV盘条的开发和生产实践

邢钢采用80t顶底复吹转炉-LF-RH-325 mm×280mm大方坯连铸流程生产40CrMoV钢（/%:0.36～0.44C, 0.15～0.35Si, 0.45～0. 70Mn, ≤0.025P, ≤0.025S, 0.80～1.15Cr, 0.50～0.65Mo, 0.25～0.35V）Φ18 mm热轧盘条。结果表明,通过控制BOF终点碳0.08%-0.12%,出钢温度1640～1660℃出钢加脱氧剂和合金,LF渣系为CaO-SiO₂-Al₂O₃,精炼后白渣碱度4～8,T（FeO+MnO）≤1. 0%,RH真空度≤100 Pa,处理时间≥20 min,喂钙线,并采用连铸结晶器电磁搅拌和控冷控轧等工艺措施,该钢盘条平均TO]为10×10^-6,平均N含量33×10^-6,抗拉强度1 200～1 250 MPa,断面收缩率59%～62%,非金属夹杂级别A0.5和D1.0,低倍组织级别均为1.0级,各项性能指标较好满足了客户的需求。

Development and Production Practice of High Strength and Heat Resistance Steel 40CrMoV Coil

The Φ18 mm hot-rolled coil of steel 40CrMoV (/% ：0.36 ~0.44C, 0. 15 ~0. 35 Si, 0.45 ~0.70Mn, ≤ 0.025P, ≤ 0.025S, 0.80 - 1. 15Cr, 0.50 - 0.65Mo, 0.25 ~0.35V) is produced by 80 t top and bottom combined blowing converter-LF-RH-325 mm x 280 mm bloom casting flowsheet at Xingtai Steel. Results show that with the process measures including controlling BOF end carbon 0. 08% ~0. 12% , tapping liquid temperature 1 640 ~ 1 660 Y , adding deoxidation agent and alloys during tapping, LF slag series CaO-SiO₂-Al₂O₃, finished refining white slag basicity 4 ~ 8 and T (FeO + MnO) ≤ 1.0% , RH vacuum ≤ 100 Pa, treated time for ≥20 min, feeding calcium wire, casting mold electromagnetic stirring and controlling rolling and cooling, the average T 0] in coil of steel is 10 X 10^-6 , average N content is 33 X 10^-6，tensile strength of steel 1 200 ~ 1 250 MPa, reduction of area 59% ~62% , rating of nonmetallic inclusions A 0.5 and D I.0, rating of each macrostructure 1.0, and each performance index all meets the requirement of user.