锻压技术

精炼和热轧工艺对热轧带钢SPHC组织性能的影响

英文标题：Influences of refining and rolling process on microstructure and properties of hot rolled strip SPHC

作者：岳重祥李慧吴圣杰李化龙

单位：江苏省(沙钢)钢铁研究院

关键词：SPHC 精炼工艺轧钢工艺夹杂物混晶

分类号：TG142.1

出版年,卷(期):页码：2017,42(12):135-139

摘要：

采用工业试验方法，研究了精炼工艺和轧钢工艺对SPHC热卷板组织性能的影响。结果表明，与RH精炼相比，LF精炼形成的夹杂物数量明显增加，同时形成的夹杂物更易成为裂纹源，故生产结构用SPHC热卷板时可采用LF工艺或RH工艺,而生产冲压用SPHC热卷板时建议采用RH工艺。终轧温度和卷取温度对SPHC热卷板组织影响较大，钢板横截面组织因终轧温度和卷取温度差异而不同。终轧温度和卷取温度较低时，钢板边部和表面易形成混晶组织，提高终轧温度至890 ℃，可将混晶组织控制在边部40 mm范围内。在合理终轧和卷取温度前提下，采用两阶段冷却可保证等轴铁素体晶粒的适度长大和固溶C析出，有利于提高钢板的冲压性能。

The influences of refining and rolling process on the microstructure and properties of hot rolled strip SPHC were studied by industrial tests. The results show that compared with the RH refining, the amount of inclusions formed in the plate produced by the LF refining is obviously increased, and these inclusions are more likely to be the source of cracks. Therefore, the LF or RH refining can be used to produce SPHC hot rolled structural plate, and the RH refining is recommended to produce SPHC hot rolled stamping plate. Finish rolling temperature and coiling temperature have significant impacts on the microstructures and properties of SPHC hot rolled strip. However, the cross section microstructure in the SPHC hot rolled strip depends on finish rolling and coiling temperatures, and heterogenous grains are easily formed in the surface and edge areas of the strip when finish rolling and coiling temperatures are low. By increasing finish rolling temperature to 890 ℃, heterogenous grains can be controlled within the range of 40 mm from the edge. Thus, under the condition of appropriate finish rolling temperature and coiling temperature, the two-stage cooling ensures a sufficient growth of equiaxed ferrite grains and C precipitation, which is beneficial for improving the stamping performance of steel.

基金项目：

江苏沙钢集团资助项目(IRIS-SS1404)

作者简介：岳重祥(1982-)，男，博士，高级工程师 E-mail：chongxiang39@163.com

参考文献：

［1］JIS G3131—2010，Hot-rolled mild steel plates,sheet and strip[S].

［2］Miyahara M, Nakayama N, Kuramoto K. Thin hot rolled steel sheet with superior formability [J]. R & D Kobe Steel Engineering Reports, 1990, 36(3):61.

［3］刘先同，何金平. 薄板坯连铸低碳低硅钢SPHC的成分控制[J]. 炼钢，2011，27(6): 20-23.

Liu X T, He J P. Compasitions control of low carbon low silicom steel SPHC in thin slab continuous casting [J]. Steelmaking, 2011, 27(6): 20-23.

［4］马晓芬，周四明，吴显辉，等. 低碳低硅SPHC 钢优化精炼工艺的生产实践[J]. 炼钢，2013，29(1): 7-10.

Ma X F, Zhou S M, Wu X H, et al. Production practice of optimization of low carbon and low silicon SPHC steel refining process [J]. Steelmaking, 2013, 29(1): 7-10.

［5］杨作宏，邹明，马明胜. BOF-LF-CSP工艺生产SPHC钢的夹杂物演变[J]. 钢铁研究学报，2013，25(3): 23-29，53.

Yang Z H, Zou M, Ma M S. Evolutinon of non-metallic inclusions in SPHC steel produced by BOF-LF-CSP process [J]. Journal of Iron and Steel Research, 2013, 25(3): 23-29, 53.

［6］邓叙燕，苏笃星，周彦召，等. BOF-RH-CC流程冶炼SPHC钢的工艺优化[J]. 炼钢，2014，30(5): 26-29，56.

Deng X Y, Su D X, Zhou Y Z, et al. Steelmaking process optimization of SPHC steel produced by BOF-RH-CC [J]. Steelmaking, 2014, 30(5): 26-29, 56.

［7］岳重祥，吴圣杰，曹垒，等. 冷轧薄板边损边裂原因概述及实例分析[J]. 锻压技术，2014，39(11): 107-112.

Yue C X, Wu S J, Cao L, et al. Cause summary and case analysis of edge crack defects during the cold rolling process of thin steel sheet [J]. Forging & Stamping Technology, 2014, 39(11): 107-112.

［8］任长春，裴新华. 边部组织状态对低碳热轧酸洗板冲压成形的影响[J]. 锻压技术，2012，37(5): 133-136.

Ren C C, Pei X H. Effect of edge microstructure characteristic on formability of low carbon picked steel sheet [J]. Forging & Stamping Technology, 2012, 37(5): 133-136.

［9］李化龙，岳重祥，谢达，等. 薄规格冷轧基板SPHC边部分层缺陷形成机理分析[J]. 锻压技术，2016，41(3): 123-128.

Li H L, Yue C X, Xie D, et al. Analysis on forming mechanism of the side separation defect for thin cold-colled substrate plate SPHC [J]. Forging & Stamping Technology, 2016, 41(3): 123-128.

［10］杜昕，康永林，关建东.冷轧总变形量、卷取温度对SPHC钢力学性能的影响[J]. 山东冶金,2008,30(2):46-48.

Du X,Kang Y L,Guang J D. Influence of total cold rolling reduction rate and coiling temperature on mechanical properties of SPHC steel [J]. Shandong Metallurgy,2008,30(2):46-48.

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