薄板坯连铸连轧高强度低合金钢的控轧控冷工艺

doi:10.13251/j.issn.0254-6051.2021.05.026

摘要/Abstract

摘要： 针对FTSR工艺生产的700 MPa级高强度低合金(HSLA)钢进行了控轧控冷(TMCP)工艺试验研究,分析了不同控制轧制和控制冷却工艺对钢带力学性能和组织的影响规律。结果表明:热轧钢带强度与精轧阶段控制轧制道次积累变形量呈现显著正相关;层流冷却方式对钢带性能影响不显著,但间隔冷却模式能够改善钢带通宽方向性能不均匀性;控制冷却终点温度由600 ℃提高至670 ℃,钢带显微组织随温度升高而发生粗化,但析出相析出更充分,钢带强度持续升高。

关键词: 薄板坯连铸连轧(FTSR), 高强度低合金钢, 控轧控冷, 力学性能

Abstract: TMCP process was carried on 700 MPa grade HSLA steel which was produced by FTSR technology and the effect of different rolling and cooling methods on mechanical properties and microstructure of the experimental steel strip was analyzed. The results show that there is significantly positive relationship between the strength of HSLA steel and accumulative deformation in finishing rolling stage. Laminar flow cooling method has little effect on mechanical properties of the experimental steel strip, but the nonuniformity of mechanical properties along width direction can be improved by interval cooling method. As ending cooling temperature increases from 600 ℃ to 670 ℃, the microstructure of the steel strip coarsens, but the precipitated phases precipitate more sufficiently, which leads to growing strength of the steel strip.

Key words: flexible thin slab rolling(FTSR), HSLA steel, thermo-mechanical control precess(TMCP), mechanical properties

中图分类号:

TG335.1

张星, 宋志岗, 侯明山, 李宏伟, 董继亮, 高小尧. 薄板坯连铸连轧高强度低合金钢的控轧控冷工艺[J]. 金属热处理, 2021, 46(5): 160-165.

Zhang Xing, Song Zhigang, Hou Mingshan, Li Hongwei, Dong Jiliang, Gao Xiaoyao. TMCP process of HSLA steel produced by FTSR technology[J]. Heat Treatment of Metals, 2021, 46(5): 160-165.

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