AUSTENITIC STAINLESS STEEL SHEET

질량%로, C：0.01~0.10%, Si：0.02~3.0%, Mn：0.02~2.0%, Ni：20~30%, Cr：14~25.0%, Mo：1.0~4.0%, Cu：0.01~2.0%, Co：0.01~0.5%, V：0.1~1.0%, B：0.001~0.01%, N：0.02% 이하, Ti：2.0~5.0%, Al：0.002~5.0%, Ti＋Al：3.3~6.0%, 잔부가 Fe 및 불순물로 이루어지는 화학 조성을 갖고, 비커스 경도 Hv가 300 이상임과 더불어 금속간 화합물인 γ'：Ni(Al, Ti)의 수밀도가 0~5/㎛이다. 내열 부품용 재료로서, 기존의 NCF625, NCF718 등의 Ni기 합금보다 염가이고, 또한 SUH660 등의 석출 강화형 내열 스테인리스강보다 고온에서의 특성이 뛰어난 석출 강화형 스테인리스 강판을 제공한다. There is provided a precipitation-strengthened stainless steel plate having a chemical composition: by mass %, C: 0.01 to 0.10%; Si: 0.02 to 3.0%; Mn: 0.02 to 2.0%; Ni: 20 to 30%, Cr: 14 to 25.0%; Mo: 1.0 to 4.0%; Cu: 0.01 to 2.0%; Co: 0.01 to 0.5%©; V: 0.1 to 1.0%; B: 0.001 to 0.01%; N: 0.02% or less; Ti: 2.0 to 5.0%; Al: 0.002 to 5.0%; Ti+Al: 3.3 to 6.0%; and the balance being Fe and impurities, the precipitation-strengthened stainless steel plate having a Vickers hardness Hv of 300 or higher, wherein the number density γ′: Ni3(Al, Ti), which is an intermetallic compound, is 0 to 5/μm2. As a heat resistant component material, the precipitation-strengthened stainless steel plate is less expensive than conventional Ni-based alloys such as NCF625 and NCF718, and more excellent in high temperature properties than a precipitation-strengthened heat-resistant stainless steel such as SUH660.