29-07-2021 дата публикации
Номер: US20210230725A1
Austenitic stainless steel sheet excellent in high-temperature fatigue characteristics able to be applied to exhaust manifolds and turbo exhaust pipes of automobiles and other parts subjected to vibration at 400° C. to 600° C. temperatures is provided, specifically, austenitic stainless steel sheet excellent in high-temperature fatigue characteristics comprising, by mass %, C: 0.002 to 0.3%, Si: 1.0 to 4.0%, Mn: 0.05 to 3.0%, P: 0.01 to 0.05%, S: 0.0001 to 0.01%, Ni: 5 to 15%, Cr: 15 to 30%, Mo: 0.5 to 4.0%, and N: 0.01 to 0.3%, having a balance of Fe and unavoidable impurities, satisfying Si+Mo≥1.8%, and satisfying A+B>2.5 mm/mmprescribing the grain boundary lengths. 1. An austenitic stainless steel sheet comprising , by mass % ,C: 0.0020 to 0.3000%,Si: 1.00 to 4.00%,Mn: 0.05 to 3.00%,Ni: 5.00 to 15.00%,Cr: 15.00 to 30.00%,Mo: 0.50 to 4.00%,N: 0.010 to 0.300%,V: 0.05 to 1.00%,Cu: 0.10 to 2.50%,Al: 0.002 to 0.100% or less,P: 0.05% or less,S: 0.0100% or less, anda balance of Fe and impurities, {'br': None, 'i': 'A+B>', 'sup': '2', '2.5 mm/mm\u2003\u2003(formula 1)'}, 'satisfying Si+Mo≥1.80%, having grain boundary lengths satisfying (formula 1){'sup': 2', '2, 'wherein, A is the sum of general grain boundary lengths per 1 mmand B is the sum of Σ3 coincidence site lattice grain boundary lengths per 1 mm.'}2. The austenitic stainless steel sheet according to further comprising claim 1 , by mass % claim 1 , one or more elements selected fromNb: 0.005 to 0.300%,Ti: 0.005 to 0.300%,B: 0.0002 to 0.0050%,Ca: 0.0005 to 0.0100%,W: 0.05 to 3.00%,Zr: 0.05 to 0.30%,Sn: 0.01 to 0.50%,Co: 0.03 to 0.30%Mg: 0.0002 to 0.0100%,Sb: 0.005 to 0.500%,REM: 0.001 to 0.200%,Ga: 0.0002 to 0.3000%,Ta: 0.001 to 1.000%, andHf: 0.001 to 1.000%.3. The austenitic stainless steel sheet according to or claim 1 , wherein a fatigue limit in a 400° C. to 600° C. atmosphere plane bending fatigue test is 250 MPa or more.4. An exhaust part comprising the austenitic stainless steel sheet according to .5. A ...
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