Abstract: The Φ150 mm microalloy steel 48MnV (0.42～0.47C,0.98～1. 18Mn,0.06～0. 10V,0.008～0.035S,  ≤0.025P)was produced by the flow sheet: hot metal pretreatment- 120t converter blow melting- LF refining- 4.8t ingot ca-  sting- 800 mill rolling for hot forging at Benxi Steel. The nitrogen content in steel was trimmed by adding N-Mn alloy with argon stiring during LF refining,after refining feeding Si-Ca wire. The analysis results showed that hydrogen content in steel was(0.6～1)×10^-⁶,oxygen content (8～15)×10^-⁶ and nitrogen content (108～149)×10^-⁶;The mechanical proper ties were tensile strengtho 815～880 MPa, yield strength σ_s490～587 MPa,elongation ð₅ 15%～21%,reduction of area ψ32%～44%,impact&n value a_s 40～54 J/cm² to meet the requirement of standard.

Key words: Microalloy Steel 48MnV,120 t Converter,LF Refining,Mechanical Properties

摘要： 本钢采用铁水预处理-120t转炉吹炼-LF精炼-4.8t铸锭-800轧机流程生产Φ150 mm 的热锻用 非调质钢48MnV(%:0.42～0.47C,0.98～1.18Mn,0.06～0.10V,0.008～0.035S,≤0.025P)。LF 精炼时加 N-Mn 合金调整钢中N 含量，吹氩，精炼后喂Si-Ca线。经分析，钢材中氢含量(0.6～1)×10^-6,氧含量(8～15)x10^-6,氮含量(108～149)×10^-⁶,轧材的力学性能为抗张强度σ_b815～880 MPa,屈服强度σ_s490～587 MPa,延伸率δ₅15%～21%,断面收缩率ψ32%～44%,冲击值a_k40～54 J/cm²,满足标准要求。

关键词: 48MnV 非调质钢, 120t转炉, LF精炼, 力学性能