An Analysis and Process Improvement on Hole-Defect of Hot-Rolled Billet of Non-Quenched and Tempered Bainite Steel FAS2225

阎岩; 郝彦英; 刘献达

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An Analysis and Process Improvement on Hole-Defect of Hot-Rolled Billet of Non-Quenched and Tempered Bainite Steel FAS2225

更新时间：2026-01-21

- An Analysis and Process Improvement on Hole-Defect of Hot-Rolled Billet of Non-Quenched and Tempered Bainite Steel FAS2225
- Special Steel Vol. 39, Issue 2, Pages: 41-43(2018)
- 作者机构：
  
  河钢集团石家庄钢铁有限责任公司技术中心,石家庄,050031
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：15 October 2017，
  
  Online First：01 July 2022，
  
  Published：01 July 2018
- 稿件说明：
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阎岩, 郝彦英, 刘献达. An Analysis and Process Improvement on Hole-Defect of Hot-Rolled Billet of Non-Quenched and Tempered Bainite Steel FAS2225[J]. Special Steel, 2018, 39(2): 41-43.
DOI：

阎岩, 郝彦英, 刘献达. An Analysis and Process Improvement on Hole-Defect of Hot-Rolled Billet of Non-Quenched and Tempered Bainite Steel FAS2225[J]. Special Steel, 2018, 39(2): 41-43. DOI：

摘要

FAS2225钢(/%:0.26C

0.35Si

1.99Mn

0.013P

0.046S

0.54Cr

0.12V

0.02Mo

0.08Ni

0.0012O

0.0070N)的生产流程为铁水预处理-60t顶底复吹转炉-LF-VD-300mm×360mm坯连铸-连轧。在215mm×213mm轧坯上出现中心开裂形成孔洞。经分析得出

加热速度过快及温度梯度过大产生的热应力和组织应力使连铸坯发生开裂造成轧制过程孔洞缺陷。通过预热段加热温度从900℃降至750℃

延长加热时间、温度梯度从△200℃降至△100℃有效遏制了孔洞缺陷的产生。

Abstract

The production flowsheet of steel FAS2225 (/%: 0.26C

0.35Si

1.99Mn

0.013P

0.046S

0.54Cr

0.12V

0.02Mo

0.08Ni

0.0012O

0.0070N) is pretreated hot-metal-60t top and bottom combined brown converter- LF-VD-300mmx360mm bloom casting-continuous rolling. The hole formed by center crack of 215mmx213mm rolled billet occurs. And it is obtained by analysis that the thermal stress and structure stress produced by larger heating speed and temperature gradient of casting bloom lead to cracks of bloom and forming hole-cracks of billet during rolling process. By decreasing the heating temperature of bloom at preheating zone in heating furnace from 900℃ to 750℃

prolonging heating time and decreasing temperature gradient from △200℃ to △100℃

it is available to inhibit the formation of hole-defects.

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