AUSTENITIC STAINLESS STEEL SHEET, METHOD FOR PRODUCING AUSTENITIC STAINLESS STEEL SHEET AND AUTOMOBILE EXHAUST COMPONENT

• Main Authors: YOSHII MUTSUKO, HAYASHI ATSUTAKA
• Format: Patent
• Language: English; Japanese
• Published: 04.07.2022
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide an austenitic stainless steel sheet having excellent heat resistance and corrosion resistance after long-aging in a σ phase precipitation temperature area.SOLUTION: An austenitic stainless steel sheet is adopted that has a predetermined chemical composition and satisfies formula (i): 5[Cr]+6[Si]+9[Mo]-2[Ni]-30[C]-70[N]-100[*Ni]/[Ni]≤0 and formula (ii): 0.80≤[*Ni]/[Ni]<1.00, where, [element symbol] in the formulae each denotes the content (mass%) of the element in steel and [*Ni] denotes an average content of Ni (mass%) in the Ni negative-segregated portion.SELECTED DRAWING: None 【課題】σ相析出温度域で長時間時効後の耐熱性および耐食性に優れたオーステナイト系ステンレス鋼板を提供する。【解決手段】所定の化学組成を有し、式（ｉ）および式（ｉｉ）を満足するオーステナイト系ステンレス鋼板を採用する。５［Ｃｒ］＋６［Ｓｉ］＋９［Ｍｏ］－２［Ｎｉ］－３０［Ｃ］－７０［Ｎ］－１００［＊Ｎｉ］／［Ｎｉ］≦０・・・式（ｉ）０．８０≦［＊Ｎｉ］／［Ｎｉ］＜１．００・・・式（ｉｉ）但し、式中の［元素記号］は、当該元素の鋼中の含有量（質量％）、［＊Ｎｉ］はＮｉ負偏析部におけるＮｉの平均含有量（質量％）を意味する。【選択図】なし