Analysis and control of color difference and black spots defects on the surface of DP980-GA dual-phase steel

doi:10.13251/j.issn.0254-6051.2021.01.042

Abstract

Abstract: Causes of color difference and black spots defects on the coating surface of DP980-GA dual phase steel were analyzed by means of SEM,and the mechanism of defects formation was discussed.The results show that insufficient wet gas,too high content of hydrogen in annealing heating section and too low temperature of strip in annealing rapid cooling section cause the oxidation and enrichment of alloy elements Mn and Cr on the surface of strip,which affects the uniformity of diffusion between Zn and Fe;too high immersing temperature of strip after heat treatment increases the galvannealing degree of coating and causes significant diffusion of Fe from the boundary of alloy oxidation.During practical production,technological measures were adopted such as adjusting the amount of wet gas injection in annealing heating section,changing wet gas injection mode from single side to double side,increasing the temperature of strip in annealing rapid cooling section and decreasing hydrogen content of annealing heating section and the immersing temperature of strip,and color difference and black spots defects on the surface of alloy coating were effectively controlled.

Key words: dual-phase steel, oxidation, enrichment, diffusion, galvannealing

CLC Number:

TG174.443

Zhang Peng, Liu Xueliang, Zhou Yu, Jia Dongmei. Analysis and control of color difference and black spots defects on the surface of DP980-GA dual-phase steel[J]. Heat Treatment of Metals, 2021, 46(1): 230-234.

References

[1] 张理扬,李俊,左良.汽车用合金化热镀锌钢板的发展趋向[J].钢铁钒钛,2004,25(4):15-19.
Zhang Liyang,Li Jun,Zuo Liang.Developing trend of galvannealed auto sheet steels[J].Iron Steel Vanadium Titanium,2004,25(4):15-19.
[2] 蒋光锐,王海全,刘李斌,等.加热段露点对C-Mn-Si-Al 高强钢选择性氧化的影响[J].金属热处理,2017,42(11):198-201.
Jiang Guangrui,Wang Haiquan,Liu Libin,et al.Effect of dew point during heating on selective oxidation behavior of C-Mn-Si-Al high strength steel[J].Heat Treatment of Metals,2017,42(11):198-201.
[3] 傅影,腾华湘,李声慈,等.合金化热镀锌带钢漏镀缺陷分析[J].金属热处理,2014,39(3):148-151.
Fu Ying,Teng Huaxiang,Li Shengci,et al.Analysis of plating miss of the galvanealed steel strip[J].Heat Treatment of Metals,2014,39(3):148-151.
[4] 巫雪松,崔秋艳,郑晓飞.镀锌DP780漏镀缺陷的成因分析与预防措施[J].中国冶金,2018,28(2):57-60.
Wu Xuesong,Cui Qiuyan,Zheng Xiaofe.Reason for failure of hot dip galvanizing on cold rolled DP780 steel and its preventive measure[J].China Metallurgy,2018,28(2):57-60.
[5] 滕华湘,李远鹏,江社明,等.露点切换对高强双相钢表面选择性氧化行为的影响[J].金属热处理,2015,40(4):181-184.
Teng Huaxiang,Li Yuanpeng,Jiang Sheming,et al.Influence of dew point shifting on selective oxidation behavior of high strength dual phase steel[J].Heat Treatment of Metals,2015,40(4):181-184.
[6] 齐达,李润昌.热镀锌钢板漏镀缺陷的成因与对策[J].电镀与涂饰,2017,36(20):1100-1103.
Qi Da,Li Runchang.Cause analysis of skip plating defects on hot-dip galvanized steel sheets and countermeasures[J].Electropating and Finishing,2017,36(20):1100-1103.
[7] 王玉,崔青玲,李建平,等.退火露点对TWIP 钢选择性氧化及可镀性的影响[J].金属热处理,2017,42(2):163-167.
Wang Yu,Cui Qingling,Li Jianping,et al.Effect of annealing dew point on selective oxidation and galvanizability of TWIP steel[J].Heat Treatment of Metals,2017,42(2):163-167.
[8] 张雨泉,杨芃,许秀飞.汽车板生产技术与管理[M].北京:化学工业出版社,2018:118-119.
[9] 刘李斌,蒋光锐,马兵智,等.连续退火热镀锌板镀层表面黑点缺陷研究[J].金属热处理,2014,39(9):137-140.
Liu Libin,Jiang Guangrui,Ma Bingzhi,et al.Study of dark dot defect on coating surface of continuously annealed hot-dip galvanized steel sheet[J].Heat Treatment of Metals,2014,39(9):137-140.
[10] 张建强,陈长风,郑雁军,等.厚规格镀锌板表面黑斑缺陷分析[J].金属热处理,2016,41(4):205-207.
Zhang Jianqiang,Chen Changfeng,Zheng Yanjun,et al.Analysis on surface black spot defects of thick gauge galvanized sheet[J].Heat Treatment of Metals,2016,41(4):205-207.

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