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.