The production process flowsheet of tested steel 16MnT (/%: 0.14~0.15C

0.27〜0.30Si

1.40Mn

0.008~0.010P

0.003~0.004S

0.020~0.025Nb

0.10V

0.002〜0.08Ti

0.025~0.027Al

0.0043~0.0053N) is 60t EAF-LF-VD-5.8 t ingot casting-Ф190~250mm forging- normalizing at 920℃. Examination results show that the impact energy of forged-normalized 0.08%Ti steel 16MnT at -20°C is 6~16J

it is lower than the value of standard requirement-34J. The analysis results obtain that large amount TiN and along grain boundary precipitated phase Nb-Ti ( C

N) exist in 0.08%Ti steel and the fracture of steel at -20T is typical brittle fracture along grain boundary

and the structure of forged product section is non-homogeneous

at surface it is sorbite while at centre of section it is ferrite+pearlite. With decreasing the Ti content in steel to 0.002% and controlling the 1.5m distance between forgings during normalizing wind-fog cooling process

the impact energy of forged product of steel 16MnT at -20℃ increases to 132~288J.