FERRITIC STAINLESS STEEL SHEET

• Main Authors: IMAGAWA KAZUNARI, YOSHII MUTSUKO, HAMADA JUNICHI
• Format: Patent
• Language: English; Japanese
• Published: 07.10.2022
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide a ferritic stainless steel sheet having good heat resistance, workability and corrosion resistance while reducing Nb and Mo.SOLUTION: There is provided a ferritic stainless steel sheet which has a chemical composition comprising, by mass%, 0.002 to 0.03% of C, 0.10 to 0.80% of Si, 1.0% or less of Mn, 0.04% or less of P, 0.030% or less of S, 17.0 to 19.5% of Cr, 0.20 to 0.60% of Nb, 5×(C+N) to 0.6% of Ti, 0.8 to 2.0% of Cu. 0.002 to 0.03% of N and the balance Fe with inevitable impurities and contains Ti-containing carbonitrides, Nb-containing carbonitrides formed so as to contact with the Ti-containing carbonitrides, has carbonitrides having a cross-sectional area of 1 μm2 or more, wherein the number density of carbonitrides is 5 pieces/mm2 or more.SELECTED DRAWING: None 【課題】ＮｂおよびＭｏを低減しながらも、良好な、耐熱性、加工性および耐食性を有するフェライト系ステンレス鋼板を提供する。【解決手段】化学組成が、質量％で、Ｃ：０．００２～０．０３％、Ｓｉ：０．１０～０．８０％、Ｍｎ：１．０％以下、Ｐ：０．０４％以下、Ｓ：０．０３０％以下、Ｃｒ：１７．０～１９．５％、Ｎｂ：０．２０～０．６０％、Ｔｉ：５×（Ｃ＋Ｎ）～０．６％、Ｃｕ：０．８～２．０％、Ｎ：０．００２～０．０３％、残部：Ｆｅおよび不純物であり、Ｔｉ含有炭窒化物と、当該Ｔｉ含有炭窒化物に接するように形成したＮｂ含有炭窒化物と、を含み、断面積が１μｍ２以上である、炭窒化物を有し、炭窒化物の個数密度が、５個／ｍｍ２以上である、フェライト系ステンレス鋼板。【選択図】なし