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高强度耐热钢40CrMoV盘条的开发和生产实践

Development and Production Practice of High Strength and Heat Resistance Steel 40CrMoV Coil
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摘要 邢钢采用8Ot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-SiO_2-Al_2O_3,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T[O]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。 The Φ18 mm hot-rolled coil of steel 40 CrMoV(/% : 0. 36 ~ 0.44 C, 0. 15 ~0. 35 Si, 0.45~ 0. 70 Mn, ≤0.025 P, ≤0. 025 S, 0. 80 ~ 1. 15 Cr, 0. 50 ~0. 65 Mo, 0. 25 ~0. 35 V) 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 ~1660℃, adding deoxidation agent and alloys during tapping, LF slag series CaO-SiO2-Al2 O3, 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[O] in coil of steel is 10 × 10-6, average N content is 33 x10-6,tensile strength of steel 1 200 ~1 250 MPa, reduction of area 59% ~62%, rating of nonmetallic inclusions A0. 5 and D1. 0, rating of each macrostructure 1. 0, and each performance index all meets the requirement of user.
作者 李永超 Li Yongchao(Technical Center,Xingtai Iron and Steel Co Ltd,xingtai 054027;Hebei Engineering Research Center for Wire Rod,xingtai 054027)
出处 《特殊钢》 北大核心 2019年第2期17-20,共4页 Special Steel
关键词 80 t BOF-LF-RH-CC流程 40CrMoV 高强度耐热钢 盘条 生产工艺 80 t BOF-LF-RH-CC Flowsheet 40CrMoV High Strength and Heat Resistance Steel Coil Production Process
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