The Ti-V microalloying 26CrMoV steel (/%：0.27C

0.45Mn

0.25Si

0.006P

0.004S

0.97Cr

0.78Mo

0.002Ti

0.043V) ϕ195 mm hot-rolled bar is treated at laboratory by two processes：880°C quenching +645°C tempering and 925 °C normalizing + 880 °C quenching + 645 °C tempering. It is found that at the subsurface 25.4 mm of bar the yield and tensile strength of the bar by the two heat treatment processes are similar

the -20°C transverse impact energy of the bar treated by quenching + tempering is 46 ~47 J

but that treated by normalizing + quenching + tempering is 79 ~86J

 the improvement effect is obvious. It is found that the microstructure of tempered sorbite and ferrite in steel with normalizing pretreatment is more uniform and smaller than that with out normalizing pretreatment.