The effect of four forging methods i. e. conventional forging-stretching

upsetting-stretching

upsetting-stretching-upsetting- stretching and upsetting-changing direction stretching on horizontal impact toughness of Φ200 mm bar products forged from 2.5 t ESR ingot of blade steel 1Cr12Ni2Mo2VN (/% : 0.10C

0.17Si

0.74Mn

0.014P

0.002S

11.8Cr

2.43Ni

1.65Mo

0.32V

0.0352N) has been analyzed. The results show that the upsetting-stretching forging with single pass large reduction and increasing upsetting-stretching forging times are available to obviously increase the horizontal impact toughness of blade steel ； with upsetting-stretching-upsetting-stretching process the horizontal impact energy of bar product heated at 1050 ℃for 1 h

oil cooling and at 660 °C for 2 h

air cooling is 141 J

the ratio of horizontal and longitudinal impact energy is more than 90%

and steel structure is uniformity with finer grains.