304不锈钢精密钢带表面“炉灰”缺陷分析
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摘要
在304不锈钢精密带光亮退火生产环节,钢带表面易出现金属粉的现象,导致产品表面质量存在不稳定性。针对304不锈钢精密钢带表面出现的"炉灰"缺陷,利用扫描电子显微镜观察其形貌,并用能谱仪对缺陷处局部成分进行了点扫描和面扫描检测。结果表明,304精密钢带"炉灰"缺陷微观形貌为白色微颗粒。结合能谱微区分析结果和相关研究分析,推测"炉灰"缺陷主要是由于304不锈钢基体组织中硼元素质量分数过高,钢带在光亮退火过程中硼原子易与保护气氛中分解的活性较高的氮原子结合,生成氮化硼析出而形成的。通过控制不锈钢基体中硼元素质量分数不大于0.001 5%,从而达到有效降低304不锈钢精密钢带"炉灰"缺陷的目的。
In the bright annealing process of 304 stainless steel precision strip,metal powder is easy to appear on the surface of the strip,which leads to the instability of the surface quality of the product.The morphology of the "ash" defect on the surface of 304 stainless steel precision strip was observed by scanning electron microscope(SEM),and the point analysis and surface distribution of local components were also detected using an energy dispersive spectrometer(EDS).The results show that micro morphology of the 304 stainless steel " ash" defect of the precision steel strip is white micro particles.Based on the results of energy dispersive spectroscopy(EDS)and related studies,it is inferred that the defect is mainly due to the high content of boron in the matrix of 304 stainless steel.During the bright annealing process,the B atom is easy to combine with the N atom which is decomposed in protective atmosphere to form boron nitride.By controlling the content of B element in the stainless steel matrix less than 0.001 5%,the "ash" defect of 304 stainless steel precision strip can be effectively reduced.
In the bright annealing process of 304 stainless steel precision strip,metal powder is easy to appear on the surface of the strip,which leads to the instability of the surface quality of the product.The morphology of the "ash" defect on the surface of 304 stainless steel precision strip was observed by scanning electron microscope(SEM),and the point analysis and surface distribution of local components were also detected using an energy dispersive spectrometer(EDS).The results show that micro morphology of the 304 stainless steel " ash" defect of the precision steel strip is white micro particles.Based on the results of energy dispersive spectroscopy(EDS)and related studies,it is inferred that the defect is mainly due to the high content of boron in the matrix of 304 stainless steel.During the bright annealing process,the B atom is easy to combine with the N atom which is decomposed in protective atmosphere to form boron nitride.By controlling the content of B element in the stainless steel matrix less than 0.001 5%,the "ash" defect of 304 stainless steel precision strip can be effectively reduced.
引文
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[2]马骏,陈兴润.304不锈钢2B板表面线鳞缺陷改进实践[J].中国冶金,2015,25(6):54.(MA Jun,CHENG Xing-run.Improvement practice for the line scales on surface of 304stainless steel 2Bplate[J].China Metallurgy,2015,25(6):54.)
[3]李璟宇,成国光,钱国余,等.304不锈钢热(冷)轧板表面线缺陷[J].中国冶金,2017,27(1):29.(LI Jing-yu,CHEN Guoguang,QIAN Guo-yu,et al.Line defect on surface of hot(cold)-rolled 304stainless steel sheet[J].China Metallurgy,2017,27(1):29.)
[4]苑鹏,李海波,陈斌,等.汽车钢板表面线状缺陷控制技术[J].钢铁研究学报,2017,29(10):800.(YUAN Peng,LI Hai-bo,CHEN Bin,et al.Control technology of surface sliver defects for automobile steel sheets[J].Journal of Iron and Steel Research,2017,29(10):800.)
[5]张安利.试论不锈钢光亮退火的若干问题[J].上海金属,2000,22(1):1.(ZHANG An-li.Discussion on some issues about bright annealing of stainless steel[J].Shanghai Metals,2000,22(1):1.)
[6]王一德,任建新,王立新.不锈钢光亮(BA)板的开发与发展[J].钢铁,2002,37(1):39.(WANG Yi-de,REN Jian-xin,WANG Li-xin.Development of BA stainless steel plate[J].Iron and Steel,2002,37(1):39.)
[7]李春明.不锈钢光亮退火板表面质量控制[J].冶金设备,2017(4):57.(LI Chun-ming.Surface quality control of stainless steel bright annealing plate[J].Metallurgical Equipment,2017(4):57.)
[8]李春明.大型不锈钢光亮退火机组的技术特点[J].轧钢,2013,30(5):35.(LI Chun-ming.Technology characteristics of large sized domestic bright annealing line for stainless steel[J].Steel Rolling,2013,30(5):35.)
[9]李岩,李聚宝,王建泽.304不锈钢冷轧板表面短线状剥落缺陷分析[J].连铸,2015(1):57.(LI Yan,LI Ju-bao,WANG Jian-ze.Morphology analysis of short-line peeling defect on surface of 304stainless steel cold-rolled sheet[J].Continuous Casting,2015(1):57.)
[10]滕涛,陈银莉,赵爱民,等.304不锈钢冷轧薄板表面线缺陷的形貌分析[J].钢铁钒钛,2007,28(3):28.(TENG Tao,CHEN Yin-li,ZHAO Ai-min,et al.Morphology of line defect on surface of 304stainless cold rolled steel sheet[J].Iron Steel Vanadium Titanium,2007,28(3):28.)
[11]樊立奎.氨分解气氛在不锈钢管材光亮退火炉上的应用[J].钢管,1999(5):29.(FAN Li-kui.Use of ammonia resolving atmosphere in bright annealing resolving atmosphere in bright annealing furnace for stainless tubular products[J].Steel Pipe,1999(5):29.)
[12]刘伟,涂益友,丁建刚,等.氨分解气氛保护退火对冷轧不锈钢带组织及硬度影响[J].金属热处理,2009,34(10):53.(LIU Wei,TU Yi-you,DING Jian-gang,et.al.Effects of annealing with ammonia dissociated protective atmosphere on microstructure and hardness of cold rolled stainless steel strip[J].Heat Treatment of Metals,2009,34(10):53.)
[13]冯佳.多孔不锈钢板上制备氮化硼纳米管阵列[D].哈尔滨:哈尔滨工业大学,2015.(FENG Jia.Preparation of BNNAs on the Porous Stainless Steel[D].Harbin:Harbin Institute of Technology,2015.)
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