轧钢铁皮制备多孔不锈钢化学成分及孔隙控制

doi:10.13228/j.boyuan.issn0449-749x.20210429

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Abstract In order to give full play to the advantages and characteristics of high iron grade,low content of impurity elements and large amount of iron oxide scale,and to develop high value-added metal products,this paper adopts vacuum reduction sintering method to prepare 316 porous stainless steel,and determines the appropriate factors affecting the preparation process and porosity. In the research process,a high-temperature vacuum tube furnace was used to reduce and sinter the samples;direct-reading spectroscopy,combined oxygen,hydrogen and nitrogen detectors,X-ray diffraction analyzers,scanning electron microscopes and other equipment were used to determine the chemical composition,phase composition and microstructure of the samples. The morphology was analyzed. The research results show that using rolled steel skin as the main raw material,with reducing agent and other alloy powders,qualified 316 porous stainless steel can be obtained through high-temperature vacuum reduction. The best preparation process is determined to be 10^-3Pa vacuum and heat preservation at 1 200 ℃ for 3 h. During the reduction and sintering process,the yield of Mn alloy is only 61%. The prepared sample is a single austenite structure,and at the same time,Cr₇C₃ is precipitated in the grain,and there is a σ phase precipitation near the grain boundary. The porosity of the sample was increased from 37.26% to 40.27% within 0-3 h of holding time,and the holding time was extended to 4 h,the sintering between the metal particles was more complete,and the porosity was reduced to 35.16%.The billet pressure was increased from 76.43 to 152.87 MPa,the porosity of porous stainless steel decreased from 42.07% to 34.44%,showing a gradual decrease trend. When the sample preparation pressure was greater than 152.87 MPa,segregation of the pore former occurred,causing the porosity to slightly increase to 35.76%. The porosity of porous stainless steel increases by 9.3% for every 10% increase in pore-forming agent ammonium bicarbonate. Through orthogonal test analysis,it is found that the amount of pore former has the most significant effect on the porosity of porous stainless steel,followed by sample preparation pressure,and holding time has the least effect on porosity.

Key words： iron oxide scale porous stainless steel vacuum reduction functional material porosity

Received: 26 July 2021

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	Articles by authors
	ZHAO Li-jie
	ZHANG Fang
	PENG Jun
	CHANG Hong-tao
	MING Shou-lu
	ZHU Rui-zong

Cite this article:

ZHAO Li-jie,ZHANG Fang,PENG Jun等. Chemical composition and pore control of porous stainless steel prepared by rolling steel skin[J]. Iron and Steel, 2022, 57(1): 133-142.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210429 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I1/133

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