Austenitic stainless steel hot-rolled steel sheet and method for manufacturing the same

Abstract

Provided is an austenitic stainless steel hot-rolled steel sheet having a small in-plane anisotropy that contributes to shape stability of a processed part and an improved yield. An austenitic stainless steel hot-rolled steel sheet having a small in-plane anisotropy, having a chemical composition containing, by mass%, C: 0.001 to 0.100%, Si: 0.01 to 2.00%, Mn: 0.01 to 10.00%, P: 0.050% or less, S: 0.0100% or less, Ni: 3.00 to 15.00%, Cr: 13.0 to 25.0%, N: 0.001 to 0.300%, with the balance being Fe and impurities, and having an intensity of each of {001}<010> orientation, {112}<111> orientation, and {110}<322> orientation obtained by X-ray diffraction of 3 or less.

Claims

1. A hot-rolled austenitic stainless steel sheet, the chemical composition of which is (in mass%): C：0.001~0.100%、 Si: 0.01~2.00% Mn: 0.01~10.00% P: below 0.050% S: Below 0.0100% Ni: 3.00~15.00% Cr：13.0~25.0%、 N：0.001~0.300%、 Ti: 0~0.50%, Nb: 0~0.60%, Al：0~1.000%、 Cu: 0~2.00%, Mo: 0~3.00% V：0~0.50%、 Zr：0~0.50%、 B：0~0.0050%、 Ca: 0~0.0100% W：0~3.00%、 Sn: 0~0.50% Co: 0~0.30%, Mg: 0~0.0100% Sb: 0~0.300% REM: 0~0.200% Ga: 0~0.3000% Ta: 0~1.000% Hf: 0~1.000% Bi: 0~0.02%, Balance: Fe and impurities, {001} <010> Orientation, {112} <111> Orientation and {110} <322> The X-ray diffraction intensities of all orientations are below 3.

2. The austenitic stainless steel hot-rolled sheet according to claim 1, wherein, The chemical composition, expressed in % by mass, contains ingredients selected from... Ti: 0.01~0.50%, Nb: 0.01~0.60%, Al：0.001~1.000%、 Cu: 0.01~2.00% Mo: 0.01~3.00% V：0.01~0.50%、 Zr：0.01~0.50%、 B：0.0002~0.0050%、 Ca: 0.0005~0.0100% W：0.10~3.00%、 Sn: 0.01~0.50% Co: 0.03~0.30%, Mg: 0.0002~0.0100% Sb: 0.005~0.300% REM: 0.002~0.200% Ga: 0.0002~0.3000% Ta: 0.001~1.000% Hf: 0.001~1.000%, and Bi: 0.001% to 0.02% of one or more.

3. The austenitic stainless steel hot-rolled sheet according to claim 1 or 2, wherein, The |Δr| obtained from equation (i) below is less than 0.10; Δr=(r0+r 90 ) / 2-r 45 …(i) The meanings of the symbols in equation (i) are as follows. r0: Lankford value relative to the 0° direction of the rolling direction. r 45 : Lankford value relative to the rolling direction at 45° r 90 : The Lankford value relative to the rolling direction at 90°.

4. A method for manufacturing austenitic stainless steel hot-rolled sheet as described in claim 3, wherein, The slab is heated at a temperature of 1200~1300℃ and a soaking time of 10 min or more but less than 60 min. Hot rolling is performed under the conditions that the finishing rolling temperature is above 1020℃ and the difference between the roughing rolling temperature and the finishing rolling temperature is less than 100℃. Annealing is performed at a heating temperature of 1100~1200℃.

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