Cailiao Baohu (Feb 2024)

Effect of Cold and Hot Rolling Process on Pitting Performance of S400 Stainless Steel

  • ZOU Chaoyang, YU Xiaoran, YU Junhui, CHEN Yinjun, LU Siyuan, CAO Jun

DOI
https://doi.org/10.16577/j.issn.1001-1560.2024.0044
Journal volume & issue
Vol. 57, no. 2
pp. 134 – 143

Abstract

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To better understand the influence of the rolling forming process on the pitting corrosion performance of stainless steel plates，the microstructure evolution， carbide precipitation and pitting corrosion mechanism of cold-rolled and hot-rolled S400 stainless steel were studied using X-ray diffraction (XRD)， electron microscopy and electrochemical testing methods.Results showed that the substrates of both coldrolled and hot-rolled S400 stainless steel were a ferrite structure.Specifically， the substrate of cold-rolled process steel (CR-S400) consisted of slender deformed ferrite grains， while the ferrite grains in hot-rolled process steel (HR-S400) were equiaxed.The precipitation of Cr-rich M23C6 carbide， which led to the pitting corrosion of both CR-S400 and HR-S400，was observed in both CR-S400 and HR-S400.HR-S400 exhibited a low pitting potential， low polarization resistance and poor corrosion resistance， potentially due to the formation of a small amount of martensite island structure in HR-S400， reducing the corrosion resistance of the S400 hot-rolled sheet.

Keywords