关键词: 控轧控冷, 铆螺钢, 终轧温度, 水冷

Abstract: The tested steel (/% : 0. 19C , 0. 17Si, 0. 44Mn, 0. 004S, 0. 007P, 0. 041 Als) is melt by a 60 kg vacuum induction furnace, forged to 120 mm x 140 mm billet, rolled to 80 mm X 80 mm billet and rolled to 4 mm X 100 mm product. The effect of finished rolled at 950 °C and 800 °C water and air cooling process on structure and properties of steel has been tested. Results show that the optimum process is beginning rolling at 1 000 °C , two passes of deformation in hot rolling, finished rolled at 800 °C, water cooling with cooling speed 32. 33 ~37. 50°C /s, best process, the performance of low carbon steel with pearlite 89% and ferrite grain size 38nm is up to rating of mushroom upsetting steel grade ML45, the mechanical properties of steel with finished rolled at 950 °C water cooling is up to steel grade ML40 and the mechanical properties of steel with finished rolled at 800 °C air cooling is up to steel grade ML30.