连续退火快冷出口温度对SPCC冷轧薄板组织和性能的影响

周博文; 蒋才灵; 樊雷; 刘义虎; 陆茂森; 杨跃标

doi:10.7513/j.issn.1004-7638.2024.04.025

连续退火快冷出口温度对SPCC冷轧薄板组织和性能的影响

doi: 10.7513/j.issn.1004-7638.2024.04.025

1.
广西柳州钢铁集团有限公司, 广西柳州 545000
2.
广西钢铁集团有限公司, 广西防城港 538000

基金项目: 柳州市科技重大专项《高品质冷轧热镀锌钢板开发及关键生产技术研究》（2019AC10603）。

详细信息

作者简介:
周博文，1991年出生，男，湖北天门人，博士，高级工程师，主要从事硅钢与汽车用钢的研制与开发，E-mail：632938590@qq.com

中图分类号: TF76,TG156.24
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出版历程
- 收稿日期: 2023-12-15
- 刊出日期: 2024-08-30

Effect of continuous annealing fast cooling outlet temprature on the microstructures and properties of SPCC cold rolled sheet

1.
Guangxi Liuzhou Iron & Steel Group Co. Ltd., Liuzhou 545000, Guangxi, China
2.
Guangxi Iron & Steel Group Co. Ltd., Fangchenggang 538000, Guangxi, China

摘要

摘要: 研究了快冷出口温度对连续退火SPCC冷轧薄板组织和性能的影响。结果表明：连续退火SPCC产品的主要组织为等轴铁素体晶粒、晶界处块状碳化物及晶粒内部粒状碳化物，快冷出口温度主要影响着钢中碳化物的析出及分布。随着快冷出口温度的降低，晶界处碳化物数量减少，晶粒内碳化物数量增多，钢卷出现屈服平台的几率显著下降，屈服强度也明显降低。当快冷出口温度从500 ℃降低至430 ℃时，屈服平台比例从55%降低至10%，平均屈服强度降低了22 MPa。
- SPCC冷轧薄板 /
- 连续退火 /
- 快冷出口温度 /
- 显微组织 /
- 力学性能
Abstract: Effect of continuous annealing fast cooling outlet temprature on the microstructures and properties of SPCC cold rolled sheet was studied. The results show that there are equiaxed ferrite grains, massive carbides on grain boundaries and granular carbides in grains in the continuous annealed SPCC cold rolled sheet. The fast cooling outlet temprature mainly affects the precipitation and distribution of carbides in steels. With a drop of the fast cooling outlet temprature, the number of carbides on the grain boundaries decreases, and the number of carbides in grains increases. The existing proportion of yield platform in the testing coils decreases, and the yield strength also decreases obviously with the decrease of outlet temperatures. When the fast cooling outlet temprature decreases from 500 ℃ to 430 ℃, the existing proportion of yield platform decreases from 55% to 10%, and the average yield strength decreases by about 22 MPa.
- SPCC cold rolled sheet /
- continuous annealing /
- fast cooling outlet temprature /
- microstructure /
- mechanical property

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图 1 连续退火工艺路线

Figure 1. Typical process curves of continuous annealing

下载: 全尺寸图片幻灯片

图 2 不同快冷出口温度试样金相组织

Figure 2. The metallographic structures of cold rolled sheets with different fast cooling outlet temperatures

（a）500 ℃；（b）470 ℃；（c）430 ℃

下载: 全尺寸图片幻灯片

图 3 不同快冷出口温度试样晶粒尺寸

Figure 3. The average grain sizes of cold rolled sheets with different fast cooling outlet temperatures

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图 4 不同快冷出口温度试样中碳化物析出情况

Figure 4. The precipitation of carbides in cold rolled sheets with different fast cooling outlet temperatures

（a）500 ℃；（b）470 ℃；（c）430 ℃

下载: 全尺寸图片幻灯片

图 5 不同快冷出口温度试样屈服强度分布

Figure 5. The yield strength of cold rolled sheets with different fast cooling outlet temperatures

下载: 全尺寸图片幻灯片

表 1 试验钢的主要化学成分

Table 1. Main chemical composition of the tested steels %

C	Si	Mn	P	Cu	Ni	Cr	Al	S	N
0.060	0.035	0.17	0.015	0.025	0.010	0.025	0.035	0.01	0.005

下载: 导出CSV

表 2 不同快冷出口温度试样屈服强度分布

Table 2. The yield strength distribution of cold rolled sheets with different fast cooling outlet temperatures

强度范围/MPa	各强度区间占比/%
强度范围/MPa	快冷出口温度430 ℃	快冷出口温度470 ℃	快冷出口温度500 ℃
(210，220]	25	0	0
(220，230]	65	25	0
(230，240]	0	35	30
(240，250]	10	30	35
(250，260]	0	10	25
(260，270]	0	0	10

下载: 导出CSV

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