冷却速度对Ф6.5~12mm SCM435钢盘条组织和冷锐开裂的影响

特殊钢 ›› 2017, Vol. 38 ›› Issue (6): 37-39.

冷却速度对Ф6.5~12mm SCM435钢盘条组织和冷锐开裂的影响

董庆^1,3,孔令波^1,2,李世琳^1,3

1.邢台钢铁有限责任公司技术中心;
2.线材厂，邢台054027；
3.河北省线材工程技术研究中心，邢台054027

收稿日期:2017-06-08 出版日期:2017-12-01 发布日期:2022-07-11
作者简介:董庆(1982-),男，工程师,河北理工大学(本科)毕业，高品质线材产品开发。

Effect of Cooling Rate on Structure and Cold-Heading Crack of Ф6.5〜12mm Coil of Steel SCM435

Dong Qing^1,3, Kong Lingbo^1,2, Li Shilin^1,3

1 Technology Center, 2 Wire Rod Plant, Xingtai Iron and Steel Co Ltd, Xingtai 054027 ；
3 Hebei Province Engineering and Technology Research Center for Wire Rod, Xingtai 054027

Received:2017-06-08 Published:2017-12-01 Online:2022-07-11

摘要/Abstract

摘要： 针对Ф6.5~12mm SCM435钢盘条冬季热轧时,出现贝氏体和马氏体而导致冷镦开裂率高的现象,通过Gleeble-1500热模拟试验机测定的奥氏体连续冷却转变曲线和冷却速度0.5~30℃/s对应的组织形貌的分析,得出形成铁素体+珠光体组织的冷却速度≤0.5℃/s;通过Ф6.5~12mm SCM435钢盘条的冷却速度和对应的组织发现散卷出保温取的温度≥600℃,冷却速度为0.8~4℃/s,其组织除铁索体+珠光体外形成部分贝氏体和马氏体。通过调整Ф6.5~12mm SCM435钢盘条轧制时的吐丝温度和斯太尔摩风冷线Z1~Z13段辊道速度,使其出保温罩时温度≤550℃,钢的奥氏体组织完全转变为铁素体+珠光体,冷镦开裂率由20%降至3%以下。

关键词: SCM435钢, 盘条, 冷锹开裂, CCT曲线, 冷却速度, 铁素体+珠光体, 贝氏体, 马氏体

Abstract: According to the phenomenon of occurring bainite and martensite in structure of Ф6.5~12mm coil of steel SCM435 rolling in winter season led to higher cracking rate of wire and rod, the analysis on continuous cooling transformation curves of austenite measured by Gleeble-1500 hot simulator and morphology of structure according with cooling rale 0.5~30°C/s has been carried out to get the cooling rate for forming structure of ferrite + pearlite being ≤0.5°C/s；by measuring the cooling rate of Ф6.5~12mm coil of steel SCM435 and observing the corresponding structure, it is found that the temperature of coil leaving insulation cover is ≥600°C with cooling rate 0.8〜4℃/s led to the structure of steel being ferrite + pearlite and partial bainite and martensite. With adjusting loop laying temperature and Stelmor Z1〜Z3 cooling roller speed in wind cooling line for Ф6.5~12mm coil of steel SCM435, the temperature of coil leaving insulation cover is ≤550℃ and the austenite structure of steel is transformed completely into ferrite + pearlite, as a result the cold-heading cracking rate of coil decreases from original 20% to less than 3%.

Key words: Steel SCM435, Coil, Cold-Heading Cracking, CCT Curves, Cooling Speed, Ferrite+Pearlite, Bainite, Martensite

董庆, 孔令波, 李世琳. 冷却速度对Ф6.5~12mm SCM435钢盘条组织和冷锐开裂的影响[J]. 特殊钢, 2017, 38(6): 37-39.

Dong Qing, Kong Lingbo, Li Shilin. Effect of Cooling Rate on Structure and Cold-Heading Crack of Ф6.5〜12mm Coil of Steel SCM435[J]. Special Steel, 2017, 38(6): 37-39.

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