关键词: S38MnSiV非调质钢, 100 t EAF-LF-VD-CC流程, , 工艺实践

Abstract: The production flow sheet of non-quenched and tempered steel S38MnSiV (/%: 0.41 ~0.45C, 0.55 ~ 0.70Si, 1.40~1.55Mn, ≤0.025P, ≤0.025S, 0.10 ~ 0.20Cr, 0.11 ~ 0.15V, 0.012 0 ~ 0.020 ON) is 40% hot metal + scrap-100 t EAF-LF-VD-160 mm x 160 mm ~260 mm x 340 mm CC process. With controlling arc furnace tap end [C] 0.15% ~ 0.30%, tapping [P]≤0. 012%, tapping temperature 1 640 ~ 1 680 °C, refining by high basicity slag, controlling aluminum content in liquid, after VD feeding manganese-nitride wire to control nitrogen content in liquid etc. process measure, the 8 heat steelmaking results show that oxygen content in steel- [O] x 10^-6 -11 x 10^-6, [H]1.2 x 10^-6 1. 5 x 10^-6 and [N] 135 x 10^-6- 180 x 10^-6, for the Φ140 mm round bar products rolled from 260 mm x 340 mm casting bloom with normalizing at 880℃ for 120 min, airflow cooling and tempered at 580℃ for 240 min air cooling, the tensile strength Rm is 870 ~925 MPa and the yield strength Re] is 560 - 605 MPa, its metallurgy quality all meets the requirement of standard.