Effect of Cold and Hot Rolling Process on Pitting Performance of S400 Stainless Steel
To better understand the influence of the rolling forming process on the pitting corrosion performance of stainless steel plates,the mi-crostructure 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 cold-rolled 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 ex-hibited 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.
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