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.