Effect of Cleanliness and Thermo-Mechanical Process on Plasticity Index of Hot Rolled Steel SCM435 Coil

沈奎; 麻啥; 王世芳; 陈爱荣

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Effect of Cleanliness and Thermo-Mechanical Process on Plasticity Index of Hot Rolled Steel SCM435 Coil

更新时间：2026-01-21

- Effect of Cleanliness and Thermo-Mechanical Process on Plasticity Index of Hot Rolled Steel SCM435 Coil
- Special Steel Vol. 33, Issue 5, Pages: 61-64(2012)
- 作者机构：
  
  1. 沙钢集团1钢铁研究院
  2. 润忠高线厂,苏州,215625
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：23 March 2012，
  
  Online First：10 October 2022，
  
  Published：10 October 2012
- 稿件说明：
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沈奎, 麻啥, 王世芳, et al. Effect of Cleanliness and Thermo-Mechanical Process on Plasticity Index of Hot Rolled Steel SCM435 Coil[J]. Special Steel, 2012, 33(5): 61-64.
DOI：

沈奎, 麻啥, 王世芳, et al. Effect of Cleanliness and Thermo-Mechanical Process on Plasticity Index of Hot Rolled Steel SCM435 Coil[J]. Special Steel, 2012, 33(5): 61-64. DOI：

摘要

试验结果得出中间包和结晶器卷渣形成的尺寸50～60μm大型铝酸钙夹杂物和贝氏体相变时间不足形成的8%～10%马氏体是SCM435钢(/%:0.34～0.35C、0.98～1.00Cr、0.19～0.21Mo)Φ12 mm热轧盘条塑性指标低的主要原因。通过(1)延长LF精炼软搅拌时间

采用保护式浇铸和钢包下渣检测控制系统

稳定拉速以减少卷渣和大型夹杂物;(2)改善控冷工艺

减少了马氏体含量

使热轧盘条的伸长率和断面收缩率分别从原先的3.9%～10.0%和4.7%～39.3%提高到10.6%～11.0%和39.9%～43.6%。

Abstract

Experimental results obtained that the main causes of low plasticity indexes of Φ12 mm hot rolled coil of steel SCM435 (/% : 0. 34 〜0. 35C

0. 98 〜1.00Cr

0. 19 ~0. 21 Mo) are size 50 -60 μm large calcium aluminate inclusion formed by slag entrapment in tundish and mold

and formed 8% ~ 10% martensite due to lack of enough time for bainite phase transformation. With (a) extending LF refining soft stirring time

using shielding casting and slag detecting system

stabilizing cast speed to reduce slag entrapment and larger inclusions； and ( b) improving control cooling process to reduce martensite content in structure

the elongation and reduction of area of hot rolled coil increase respectively from original 3. 9% 〜10.0% and 4.7% -39.3% to 10.6% -11.0% and 39. 9% 〜43. 6%.

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