连续退火对350 MPa级冷轧高耐蚀型耐候钢组织性能的影响

doi:10.13251/j.issn.0254-6051.2024.09.003

金属热处理 ›› 2024, Vol. 49 ›› Issue (9): 18-23.DOI: 10.13251/j.issn.0254-6051.2024.09.003

连续退火对350 MPa级冷轧高耐蚀型耐候钢组织性能的影响

王耐, 马德刚, 李建英, 马光宗, 孙璐, 孙宏亮, 纪明龙

唐山钢铁集团有限责任公司高强汽车板有限公司, 河北唐山 063000

收稿日期:2024-03-16 修回日期:2024-07-14 出版日期:2024-09-25 发布日期:2024-10-29
通讯作者: 马德刚,高级工程师,博士,E-mail:madegang@hbisco.com
作者简介:王耐(1988—),男,工程师,硕士,主要研究方向为汽车板产品研发,E-mail:wangnai891028@163.com。

Effect of continuous annealing on microstructure and properties of 350 MPa cold-rolled high corrosion resistant weathering steel

Wang Nai, Ma Degang, Li Jianying, Ma Guangzong, Sun Lu, Sun Hongliang, Ji Minglong

Gaoqiang Automobile Plate Co., Ltd., Tangshan Iron and Steel Group Co., Ltd., Tangshan Hebei 063000, China

Received:2024-03-16 Revised:2024-07-14 Online:2024-09-25 Published:2024-10-29

摘要/Abstract

摘要： 利用Gleeble-3500热模拟试验机对350 MPa级冷轧高耐蚀型耐候钢进行模拟连续退火处理,研究了连续退火工艺对其组织性能的影响。结果表明,随着退火温度的升高,试验钢强度先降低后增加,退火温度是影响试验钢组织性能的关键因素,带速、缓冷温度和快冷终止温度对试验钢性能的影响有限。当退火温度＜800 ℃时,试验钢发生回复和再结晶转变,组织为铁素体+碳化物,强度随退火温度升高而降低;当退火温度为800 ℃时,试验钢屈强比达到最小值0.53,呈现双相钢特征,处于奥氏体化温度Ac₁临界退火;当退火温度＞800 ℃时,试验钢发生回复、再结晶和奥氏体化转变,冷却后组织为铁素体+贝氏体+碳化物,强度随退火温度的升高而升高。综合分析,实际生产中可采用低温退火和高温退火两种工艺路线获得满足标准要求的试验钢。

关键词: 高耐蚀型耐候钢, 连续退火, 强度, 显微组织

Abstract: Effect of continuous annealing process on microstructure and properties of 350 MPa cold-rolled high corrosion resistant weathering steel was studied by simulating continuous annealing process with Gleeble-3500 annealing machine. The results show that with the increase of annealing temperature, the strength of the tested steel decreases first and then increases, the annealing temperature is the key factor affecting the microstructure and properties of the tested steel, whereas, the effect of strip speed, slow cooling temperature and rapid cooling temperature on properties of the tested steel is limited. When the annealing temperature is lower than 800 ℃, only recovery and recrystallization in the tested steel occur, and the microstructure is composed of ferrite and carbide, the strength of the tested steel decreases with the increase of annealing temperature. When the annealing temperature is 800 ℃, the yield ratio reaches a minimum value of 0.53, exhibiting the characteristics of duplex steel, and is annealed at the critical austenitizing temperature Ac₁. When the annealing temperature is higher than 800 ℃, the tested steel occurs recovery, recrystallization and austenitization transformation, and the microstructure is composed of ferrite, bainite and carbide after cooling, and the strength of the tested steel increases with the increase of annealing temperature. Based on the comprehensive analysis, two process routes, low-temperature annealing and high-temperature annealing, can be used in industrial production to obtain the tested steel that meet the standard requirements.

Key words: high corrosion resistance weathering steel, continuous annealing, strength, microstructure

中图分类号:

TG156.2

王耐, 马德刚, 李建英, 马光宗, 孙璐, 孙宏亮, 纪明龙. 连续退火对350 MPa级冷轧高耐蚀型耐候钢组织性能的影响[J]. 金属热处理, 2024, 49(9): 18-23.

Wang Nai, Ma Degang, Li Jianying, Ma Guangzong, Sun Lu, Sun Hongliang, Ji Minglong. Effect of continuous annealing on microstructure and properties of 350 MPa cold-rolled high corrosion resistant weathering steel[J]. Heat Treatment of Metals, 2024, 49(9): 18-23.

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连续退火对350 MPa级冷轧高耐蚀型耐候钢组织性能的影响

Effect of continuous annealing on microstructure and properties of 350 MPa cold-rolled high corrosion resistant weathering steel

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