M<sub>23</sub>C<sub>6</sub>析出相对节镍型奥氏体不锈钢冷轧表面裂纹的影响

doi:10.13228/j.boyuan.issn1006-9356.20190470

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Abstract In order to find out the causes of surface cracks of cold-rolled low-nickel austenitic stainless steel strip produced by Liuzhou Steel, the surface cracks were detected and analyzed by the optical microscope and the scanning electron microscope, and analyzed and calculated by combining with heat treatment test and thermodynamic software JMatPro. It was found that there were a large number of precipitated phases at the grain boundary of the cracks, and accordingly, it was presumed that the precipitated phase was the main cause of surface cracks on products during cold rolling. The heat treatment test was carried out by simulating the continuous annealing process. The results showed that the normal annealing process cannot completely eliminate the large amount of precipitated phases accumulated at the grain boundary of steel coil during hot rolling process. The equilibrium phase diagram of austenitic stainless steel under this composition system was calculated and studied by combining with energy spectrum and TEM diffraction spot analysis. The results showed that the precipitation temperature of M₂₃C₆ carbide ranged from 500 to 925 ℃. When the steel coil cooled down slowly from high temperature, M₂₃C₆ carbide would be precipitated out, and the peak precipitation temperature was about 850-900 ℃. The possible measures to reduce the amount of M₂₃C₆ carbide precipitates in steel coil were put forward based on the actual process flow.

Key words： M₂₃C₆ precipitated phase austenitic stainless steel crack thermodynamic calculation

Received: 09 October 2019

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	Articles by authors
	WU Hai-lin
	FAN Lei
	YANG Jian-hong
	QIAN Xue-hai
	WANG Bi
	LUO Jing

Cite this article:

WU Hai-lin,FAN Lei,YANG Jian-hong等. Effects of M₂₃C₆ precipitated phase on surface crack of cold-rolled low-nickel austenitic stainless steel[J]. China Metallurgy, 2020, 30(4): 51-56.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20190470 OR http://www.zgyj.ac.cn/EN/Y2020/V30/I4/51

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