Effect of Grain Size on Impact Energy of Φ140 mm Products of Steel Q345E at -40 ℃ and Rolling Process Improvement

张君平; 时振明; 刘亚丽

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Effect of Grain Size on Impact Energy of Φ140 mm Products of Steel Q345E at -40 ℃ and Rolling Process Improvement

更新时间：2026-01-21

- Effect of Grain Size on Impact Energy of Φ140 mm Products of Steel Q345E at -40 ℃ and Rolling Process Improvement
- Special Steel Vol. 40, Issue 3, Pages: 62-64(2019)
- 作者机构：
  
  1. 山东钢铁营销总公司,莱芜,271100
  2. 山东钢铁股份有限公司莱芜分公司特钢事业部,莱芜,271100
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：10 December 2018，
  
  Online First：17 May 2022，
  
  Published：17 May 2019
- 稿件说明：
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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：

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：

摘要

试验的Q345E钢(/%:0.13C

0.23Si

1.45Mn

0.012P

0.005S

0.045V

0.030Nb

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.

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