张君平, 时振明, 刘亚丽. Effect of Grain Size on Impact Energy of Φ140 mm Products of Steel Q345E at -40 ℃ and Rolling Process Improvement[J]. Special Steel, 2019, 40(3): 62-64.
张君平, 时振明, 刘亚丽. Effect of Grain Size on Impact Energy of Φ140 mm Products of Steel Q345E at -40 ℃ and Rolling Process Improvement[J]. Special Steel, 2019, 40(3): 62-64.DOI:
0.030Al)的冶炼工艺为100 t EAF-LF-VD-Φ500 mm坯连铸-Φ140 mm材轧制。通过Q345E钢热处理试验得出晶粒度级别对试验钢-40℃冲击功有显著影响;当钢材晶粒度级别为7.0时
-40℃冲击功仅为12~16 J
当晶粒度级别为9.0~10.0时
-40℃冲击功为80~198 J。通过将终轧温度从960℃降至865~910℃
钢材晶粒度级别由7.0提高至8.5~9.6
-40℃冲击功由12~16 J提高到61~82 J
满足-40℃冲击功34 J的标准要求。
Abstract
The steelmaking process of tested steel Q345E (/% :0.13C
0.23Si
1.45Mn
0.012P
0. 005S
0.045V
0.030Nb
0.030Al) is 100 t EAF- LF- VD- Φ500mm bloom casting-Φ140mm bar rolling. By heat treatment test of steel Q345E
it is obtained that the effect of grain size rating on impact energy of tested steel at -40°C is obvious
as the rating of grain size of products is 7.0
the impact energy of steel at -40°C is only 12 ~ 16 J
and as the rating of grain size is 9.0 ~ 10.0
the impact energy of steel at -40°C. is increasing to 80 ~ 198 J. With decreasing finished rolling temperature from 960 °C to 865 ~910 °C
the rating of grain size of steel products increases from 7.0 to 8.5 ~9.0 and the impact energy of steel at -40°C increases from 12 ~ 16 J to 61 ~ 82 J to meet the standard requirement of impact energy 34 J of steel at -40 °C.