04-02-2021 дата публикации
Номер: US20210032718A1
A ferritic stainless steel sheet is provided that has a chemical composition consisting of, in mass %, C: 0.001 to 0.020%, Si: 0.02 to 1.50%, Mn: 0.02 to 1.50%, P: 0.01 to 0.05%, S: 0.0001 to 0.01%, Cr: 10.0 to 25.0%, Ti: 0.01 to 0.30%, N: 0.001 to 0.030%, and optional elements, with the balance being Fe and unavoidable impurities, wherein: a grain size number is 6 or more; the ferritic stainless steel sheet satisfies the formulas [A+B≥12.0/t], [X+Y≥12.0/(t−0.3)] and [(X+Y)−(A+B)≤5.0] with respect to crystal orientation intensities of a ferrite phase obtained by X-ray diffraction; and the sheet thickness is 1.0 mm or more. 1. A ferritic stainless steel sheet , comprising a chemical composition consisting of , in mass % ,C: 0.001 to 0.020%,Si: 0.02 to 1.50%,Mn: 0.02 to 1.50%,P: 0.01 to 0.05%,S: 0.0001 to 0.01%,Cr: 10.0 to 25.0%,Ti: 0.01 to 0.30%,N: 0.001 to 0.030%,Nb: 0 to less than 0.10%,Sn: 0 to 0.500%,Mg: 0 to 0.0100%,B: 0 to 0.0050%,V: 0 to 1.0%,Mo: 0 to 3.0%,W: 0 to 3.0%,Al: 0 to 0.5%,Cu: 0 to 2.0%,Zr: 0 to 0.30%,Co: 0 to 0.50%,Sb: 0 to 0.50%,REM: 0 to 0.05%,Ni: 0 to 2.0%,Ca: 0 to 0.0030%,Ta: 0 to 0.10%,Ga: 0 to 0.1%, andthe balance: Fe and unavoidable impurities,wherein:a grain size number is 6.0 or more,the ferritic stainless steel sheet satisfies formula (i), formula (ii) and formula (iii) described hereunder with respect to crystal orientation intensities of a ferrite phase obtained by X-ray diffraction, [{'br': None, 'i': A+B≥', 't, '12.0/\u2003\u2003(i)'}, {'br': None, 'i': X+Y≥', 't−, '12.0/(0.3)\u2003\u2003(ii)'}, {'br': None, 'i': X+Y', 'A+B, '()−()≤5.0\u2003\u2003(iii)'}], 'and a sheet thickness is 1.0 mm or more;'}where, each symbol in the above formulas is defined as follows:t: sheet thickness (mm)A: a {111}<112> crystal orientation intensity at a center portion of sheet thicknessB: a {111}<112> crystal orientation intensity at a ¼ portion of the sheet thicknessX: a {322}<236> crystal orientation intensity at a center portion of sheet thicknessY: a { ...
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