The test of isothermal compressive deformation on hot-rolled product of bearing steel GCrl5 (/%: 0. 99C

0. 31Mn

0. 24Si

0. 010P

0. 003S

1. 44Cr

0. 01V) with strain rate 0. 1 ~3 s

-1

strain 0. 7 at 800 ~ 1 150 ℃. is carried out by using Gleeble-1500 thermal simulation machine. And the 3-demensinal thermal-mechanical coupling finite element simulation on ten passes continuous hot-rolling process for Φ70 nun bar products of bearing steel GCrl5 rolling from 200 mm X 200 mm casting billet has been engaged based on established Hensel/Spittel deformation resistance model and by using LARTRAN/SHAPE finite element simulation software. By analyzing the variation rule of stock temperature

strainstress field

spread and rolling load parameters in each pass

it is obtained that the cracks maybe occ

ur at the comer of stock in fifth pass therefore during rolling process should reduce the strain in fifth pass to prevent formation of cracks. Comparing the simulated value and the measured value

the relative errors of width and height size of stock section at layout of each pass are respectively 0. 40% ~5. 90% and 0. 28% ~6. 11%.