关键词: 冷镦钢, ML45Mn2, 控轧控冷

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.