Hot Plasticity of Casting Slab of Nb-Ti Microalloying High Performance Steel Q370qE-HPS for Bridge Beam at 700-1050 ℃

周雯; 吴开明; 王厚昕; 郭爱民; 邹德辉; 李书瑞

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Hot Plasticity of Casting Slab of Nb-Ti Microalloying High Performance Steel Q370qE-HPS for Bridge Beam at 700-1050 ℃

更新时间：2026-01-21

- Hot Plasticity of Casting Slab of Nb-Ti Microalloying High Performance Steel Q370qE-HPS for Bridge Beam at 700-1050 ℃
- Special Steel Vol. 36, Issue 5, Pages: 55-58(2015)
- 作者机构：
  
  1. 武汉科技大学国际钢铁研究院,武汉,430081
  2. 中信微合金化技术中心,北京,100004
  3. 武汉钢铁(集团)公司研究院,武汉,430080
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：06 May 2015，
  
  Online First：16 August 2022，
  
  Published：16 August 2015
- 稿件说明：
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周雯, 吴开明, 王厚昕, et al. Hot Plasticity of Casting Slab of Nb-Ti Microalloying High Performance Steel Q370qE-HPS for Bridge Beam at 700-1050 ℃[J]. Special Steel, 2015, 36(5): 55-58.
DOI：

周雯, 吴开明, 王厚昕, et al. Hot Plasticity of Casting Slab of Nb-Ti Microalloying High Performance Steel Q370qE-HPS for Bridge Beam at 700-1050 ℃[J]. Special Steel, 2015, 36(5): 55-58. DOI：

摘要

利用Gleeble 1500D热模拟试验机

对开发的Q370qE-HPS高性能桥梁钢（/%:0.09C，0.36Si，1.33Mn，0.013P，0.004S，0.036Nb，0.015Ti，0.022Als，0.33CEV）230 mm×1 400 mm连铸坯进行700~1050℃的热塑性试验研究。结果表明

Q370qE-HPS高性能桥梁钢800~1050℃为高塑性区间

与传统正火工艺桥梁钢Q370qE（/%:0.14C，0.38Si，1.45Mn，0.012P，0.004S，0.028Nb，0.014Ti，0.023Als，0.38CEV）相比较

Q370qE-HPS钢高塑性的温度范围较大;700~800℃为低塑性区间

在此区间沿奥氏体晶界析出的铁素体膜使抗拉强度降低

尤其当晶界处存在Nb-Ti碳氮化物时

应力作用下容易产生裂纹和孔隙

从而使钢的热塑性降低。

Abstract

With using Gleeble-1500D thermal/mechanical simulation testing machine

the hot plasticity of 230 mm x 1400 mm casting slab of developed high performance steel Q370qE-HPS for bridge beam (/% : 0.09C

0.36Si

1.33Mn

0.013P

0.004S

0.036Nb

0.015Ti

0.022Als

0.33CEV) at 700-1050℃ has been tested and studied. Results show that the high hot plasticity zone of high performance steel Q370qE-HPS for bridge beam is at 800-1050℃

as compared with traditional normalized steel Q370qE for bridge beam (/% : 0.14C

0.38Si

1.45Mn

0.012P

0.004S

0.028Nb

0.014Ti

0.023Als

0.38CEV) the high plasticity zone of steel Q370qE-HPS is larger j and the low plasticity of steel is at 700-800℃

in this zone the ferrite lath formed at austenite grain boundaries has low tensile strength especially as the Nb-Ti carbo-nitrides exist grain boundaries

the crack and void form easily by charging stress led to deteriorate the hot plasticity of steel.

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