Abstract: The main process technology of 120 t BOF-LF-VD-350 mm x430 mm cast bloom-150 mm x 150 mm rolled billet flow sheet produced ML45Mn2 steel Φ16 mm and Φ 18 mm wire rod is using refining slag with basicity of 1.5 ~2.0, 52 ton tundish, electromagnetic stirring, light and heavy reducing, initial rolling at 1 010 ~ 1 070 °C , finishing rolling at 820 ~ 850 °C,coiling at 780 ~ 820 °C, and cooling rate 0.15 ~ 0.4 °C/s. The test results show that of ML45Mn2 steel hot rolled wire rod, the average tensile strength is 797 MPa, the average reduction of area is 50.3% ,1/4 of the cold heading is qualified, the metallurgical structure is pearlite + ferrite, the average section hardness value is 92.5HRB, the band structure is 1.5 ~ 2.5 to meet the technical requirements.

摘要： 120 t转炉-LF-VD-350 mm x430 mm铸坯-150 mm x 150 mm轧坯-轧制流程生产的ML45Mn2钢Φ16 mm和Φ18 mm盘条采用的主要工艺为:碱度1.5-2.0精炼渣,52 t中间包，电磁搅拌，轻重压下，开轧温度1 010 ~ 1 070 °C,精轧温度820 - 850°C，卷曲温度780 - 820°C，冷速0. 15 -0.4 °C/s等工艺。检验结果显示，MI45Mn2钢盘条热轧态平均抗拉强度797 MPa,平均断面收缩率50.3% ,1/4冷镦合格，金相组织为珠光体+铁素体,断面平均硬度值为92.5HRB,带状组织1.5-2.5级,满足技术要求。

关键词: 冷镦钢, ML45Mn2, 控轧控冷