Effect of Relaxation Time after Finishing Rolling on YS-UTS Ratio of Q345GJC Steel Plate for High-Rise Building

王庆敏; 刘应心

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Effect of Relaxation Time after Finishing Rolling on YS-UTS Ratio of Q345GJC Steel Plate for High-Rise Building

更新时间：2026-01-21

- Effect of Relaxation Time after Finishing Rolling on YS-UTS Ratio of Q345GJC Steel Plate for High-Rise Building
- Special Steel Vol. 30, Issue 3, Pages: 66-68(2009)
- 作者机构：
  
  秦皇岛首秦金属材料有限公司.,秦皇岛,066326
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：19 November 2008，
  
  Online First：25 November 2022，
  
  Published：25 November 2009
- 稿件说明：
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王庆敏, 刘应心. Effect of Relaxation Time after Finishing Rolling on YS-UTS Ratio of Q345GJC Steel Plate for High-Rise Building[J]. Special Steel, 2009, 30(3): 66-68.
DOI：

王庆敏, 刘应心. Effect of Relaxation Time after Finishing Rolling on YS-UTS Ratio of Q345GJC Steel Plate for High-Rise Building[J]. Special Steel, 2009, 30(3): 66-68. DOI：

摘要

研究了Nb微合金钢Q345GJC(%:0.16C、1.37Mn、0.026Nb)12 mm板850℃终轧后驰豫30～60 s再进入层流冷却对该钢屈强比的影响。结果表明

延长驰豫时间可以增大铁素体晶粒尺寸和含量、珠光体球团片层增厚

降低屈强比。当驰豫30s时

试验钢屈强比由未驰豫的0.765降低至0.737;当驰豫60 s时

屈强比降至0.718

Abstract

Effect of relaxing for 30 - 60 s after finishing rolling at 850 Y before cooling in air flow on yield strength- ultimate tensile strength (YS-UTS) ratio of 12 nini plate of Nh microalloving steel Q345GJC (% : 0. 16C

1. 37Mn

0.026Nb) has been studied. Results showed that with increasing relaxation time the grain size and content of ferrite increased and laniellar of pearlite colony thickened to decrease YS-UTS ratio. The YS-LTS ratio of test steel with relaxing for 30 s decreased to 0. 737 from 0. 765 of original un-relaxing steel

and that with relaxing for 60 s decreased to 0. 718.

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