According to the status of serious wearing of rough mill roller during 240 mm X 240 mm bloom of bearing steel GCr15 at rolling mill

the effect of stock reduction amount

roll hardness

thermal conductivity and friction factor at a time of forming pass on roll wearing rule has been simulated and analyzed by using Archard wear mathematical model. The simulated results show that the higher the hardness of roll

the stronger the roll wear resistance; the effect of thermal conductivity on wearing of roll is minor； as friction factor f＞0.25

the effect of friction factor on change of wearing of roll is obvious; as stock reduction amount △h＜50 mm

the effect of stock reduction amount on wearing of roll is also obvious. Based

on obtained results

combined with rolling process in situ and material of roll

with the measures including modifying the used spheroidal graphite I roll [tensile strength≥400 MPa

HRC hardness 40

thermal conductivity 18 kW/(m

2

·℃ ) and friction factor/=0.3

]

to spheroidal graphite II roll [ tensile strength 3500 MPa

HRC hardness 45

thermal conductivity 17 kW/(m

2

·℃) and friction factor/=0.2

]

and decreasing the reduction amount from 70 mm to 50 mm

the rolling steel amount by single groove of roll increases from 10000 t before optimization to 18000-20000 t after optimization.