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| Analysis of "ash" defect on surface of 304 stainless #br# steel precision steel strip |
| LIU Guangyong1，YIN Bangwu1，TIAN Weiguang1,2，XU Jialin1,2，LU Haifei1,2 |
(1. Technical Quality Department， Guangdong Guang Qing Metal Technology Co.， Ltd.，
Yangjiang 529533， Guangdong， China；2.Guangdong Provincial Key Laboratory of High Quality
Stainless Steel Technology Research and Development， Yangjiang 529533， Guangdong， China) |
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Abstract 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.
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