连续退火工艺对4.5%Cr冷轧耐候钢组织性能的影响

doi:10.13251/j.issn.0254-6051.2022.02.024

金属热处理 ›› 2022, Vol. 47 ›› Issue (2): 137-140.DOI: 10.13251/j.issn.0254-6051.2022.02.024

连续退火工艺对4.5%Cr冷轧耐候钢组织性能的影响

俞波, 张宜, 王占业, 柴立涛

马鞍山钢铁股份有限公司技术中心, 安徽马鞍山 243000

收稿日期:2021-09-27 修回日期:2021-11-28 出版日期:2022-02-25 发布日期:2022-04-01
作者简介:俞波(1990—),男,工程师,硕士,主要研究方向为钢铁材料的组织性能,E-mail:yubo_M79789@baosteel.com
基金资助:
国家重点研发计划(2017YFB0304300,2017YFB0304305)

Effect of continuous annealing process on microstructure and properties of 4.5%Cr cold-rolled weathering steel

Yu Bo, Zhang Yi, Wang Zhanye, Chai Litao

Technology Center, Ma'anshan Iron & Steel Co., Ltd., Ma'anshan Anhui 243000, China

Received:2021-09-27 Revised:2021-11-28 Online:2022-02-25 Published:2022-04-01

摘要/Abstract

摘要： 利用Multipas退火试验机模拟连续退火工艺,研究了退火工艺对4.5%Cr冷轧耐候钢组织性能的影响。结果表明,随着退火温度的升高,试验钢的强度先降低后增加,当退火温度为830 ℃时,强度最高,屈服强度均值为353 MPa,抗拉强度均值约为621 MPa。冷速(50 ℃/s、30 ℃/s)对试验钢强度影响有限。当退火温度≤800 ℃时,试验钢的组织只发生了回复再结晶,组织由铁素体、珠光体和碳化物组成。当退火温度＞800 ℃,铁素体组织发生了奥氏体化,冷却后形成了贝氏体。当Cr含量(质量分数)提高至4.5%,试验钢的相对腐蚀速率为26%(相对于Q345B钢),相对普通耐候钢SPA-C耐候性能提高约一倍。

关键词: 4.5%Cr冷轧耐候钢, 连续退火工艺, 贝氏体, 力学性能

Abstract: Effect of annealing process on microstructure and properties of 4.5%Cr cold-rolled weathering steel was studied by simulating continuous annealing process with Multipas annealing machine. The results show that with the increase of annealing temperature, the strength of the tested steel first decreases and then increases. When the annealing temperature is 830 ℃, the strength is the highest, the average yield strength is 353 MPa, and the average tensile strength is about 621 MPa. The cooling rate of 50 ℃/s and 30 ℃/s has limited effect on strength of the tested steel. When the annealing temperature is lower than 800 ℃, only recovery and recrystallization in the tested steel occur, and the microstructure is composed of ferrite, pearlite and carbide. When the annealing temperature is higher than 800 ℃, the ferrite is austenitized and bainite is formed in the tested steel after cooling. When the mass fraction of Cr increases to 4.5%, the relative corrosion rate of the tested steel is 26%(relative to Q345B steel), and compared with ordinary weathering steel SPA-C, its weathering performance is doubled.

Key words: 4.5%Cr cold-rolled weathering steel, continuous annealing process, bainite, mechanical properties

中图分类号:

TB31

俞波, 张宜, 王占业, 柴立涛. 连续退火工艺对4.5%Cr冷轧耐候钢组织性能的影响[J]. 金属热处理, 2022, 47(2): 137-140.

Yu Bo, Zhang Yi, Wang Zhanye, Chai Litao. Effect of continuous annealing process on microstructure and properties of 4.5%Cr cold-rolled weathering steel[J]. Heat Treatment of Metals, 2022, 47(2): 137-140.

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连续退火工艺对4.5%Cr冷轧耐候钢组织性能的影响

Effect of continuous annealing process on microstructure and properties of 4.5%Cr cold-rolled weathering steel

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