Continuous Cooling Transformation and Structure Refinement of A Low Carbon High Strength Steel Produced by FTSR

Special Steel ›› 2009, Vol. 30 ›› Issue (5): 60-62.

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Continuous Cooling Transformation and Structure Refinement of A Low Carbon High Strength Steel Produced by FTSR

Gao Aimin¹ , Yang Kun¹ , Feng Yunli¹ , Chen Libin²

1. Metal Material Engineering Department,Hebei Polytechnic University,Tangshan 063009;
2. Technology Centre,Tangshan lron and Steel Co Ltd,Tangshan 063016；

Received:2009-03-18 Online:2009-10-01 Published:2022-11-18

FTSR低碳高强钢连续冷却相变和组织细化

高爱民¹，杨琨¹，冯运莉¹，陈礼斌²

1. 河北理工大学金属材料工程系，唐山 063009;
2. 唐山钢铁有限公司技术中心，唐山 063016；

作者简介:高爱民(1966-)，女，硕士，副教授，冶金物理化学、金属材料的强化与韧化研究。
基金资助:
唐山市科学技术研究与发展计划资助项目，项目编号：04204501C-227

Abstract

Abstract: Continuous cooling transformation(CCT) and structure of 85 mm FTSR(Flexible Thin Slab rolling) cast slab ofa low carbon steel(%:0.19C,1.15Mn,0.008Mo,0.002Ti,0.032Als)deformed 40% with stain rate 5 s-1 at 1000 ℃ then cooling with 5℃/s to 900 ℃ and deformed 30% with 50s-1 and cooling to 400℃ with 1~70 ℃/s,then air cooling have been studied by Gleeble-3500 thermo-mechanical simulator.Results showed that as cooling rate ≤20 ℃/s,the CCT structure of steel was ferrite and pearlite,and as cooling rate was up to 30 ℃/s,minor globular bainite occurred in structure; with increasing cooling rate the grain size decreased,and as cooling rate was up to 10 ℃/s the grain size in steel was ≤ 10 μm and as cooling rate was ≥20℃/s.the grain refinement extent was minor.

Key words: FTSR Process, Low Carbon High Strength Steel, Transformation, Structure Refinement

摘要： 用Gleeble-3500热模拟机研究了低碳钢 (%:0.19C、1.15Mn、0.008Mo、0.002Ti、0.032Als) 85 mm FTSR(薄板坯连铸连轧)铸坯在1 000℃以5 s^-1速率变形40%,然后以5℃/s冷却到900℃并以50 s^-1的速率变形30%,再以1～70℃/s冷却到400℃,空冷的连续相转变和组织。结果表明,冷却速度≤20℃/s时连续冷却转变的组织为铁素体和珠光体;冷却速度达30℃/s时,组织中出现少量粒状贝氏体。随冷却速度增加,晶粒尺寸减小,当冷却速度达10℃/s时,钢中的晶粒尺寸≤10μm,当冷却速度≥20℃/s时,钢中晶粒细化程度减弱。

关键词: FTSR工艺, 低碳高强度钢, 相变, 组织细化

Gao Aimin , Yang Kun , Feng Yunli , Chen Libin. Continuous Cooling Transformation and Structure Refinement of A Low Carbon High Strength Steel Produced by FTSR[J]. Special Steel, 2009, 30(5): 60-62.

高爱民, 杨琨, 冯运莉, 陈礼斌. FTSR低碳高强钢连续冷却相变和组织细化[J]. 特殊钢, 2009, 30(5): 60-62.

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Continuous Cooling Transformation and Structure Refinement of A Low Carbon High Strength Steel Produced by FTSR

FTSR低碳高强钢连续冷却相变和组织细化

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