FERRITIC STAINLESS STEEL SHEET EXCELLENT IN CARBURIZATION AND OXIDATION RESISTANCE, AND METHOD OF MANUFACTURING THE SAME

• Main Authors: INOUE YOSHIHARU, HAMADA JUNICHI, HIRAIDE NOBUHIKO, HAYASHI ATSUTAKA
• Format: Patent
• Language: English; Japanese
• Published: 20.10.2016
• Subjects: ALLOYS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a ferritic stainless steel sheet and a method of manufacturing the same, the ferritic stainless steel sheet being excellent in carburization and oxidation resistance, used for an automotive exhaust system or a fuel reformer that become a carburizing atmosphere.SOLUTION: There is provided a ferritic stainless steel sheet containing, by mass%, Si: 0.05-3.0%, Mn: 0.05-2.0%, Cr: 12.0-25.0%, Cu: 0.01-2.0%, Ni: 0.01-2.0%, Mo: 0.01-2.0%, Nb: 0.001-1.0%, Ti: 0.001-0.40%, Al: 0.002-0.25%, V: 0.01-0.20%, and B: 0.0002-0.0050%, satisfying formulas (i) and (ii). The formulas are: (i) Cr+12Si-4Mn-14.5≥0 and (ii) aCr+bSi+1.6Mn+27Ti+33Al+13.5≥0 (a, b are constants fixed by contents of Cr and Si).SELECTED DRAWING: Figure 1 【課題】耐浸炭性及び耐酸化性に優れた、浸炭性を有する雰囲気となる自動車排気系又は燃料改質器用フェライト系ステンレス鋼板及びその製造方法を提供する。【解決手段】質量％で、Ｓｉ：０．０５〜３．０％、Ｍｎ：０．０５〜２．０％、Ｃｒ：１２．０〜２５．０％、Ｃｕ：０．０１〜２．０％、Ｎｉ：０．０１〜２．０％、Ｍｏ：０．０１〜２．０％、Ｎｂ：０．００１〜１．０％、Ｔｉ：０．００１〜０．４０％、Ａｌ：０．００２〜０．２５％、Ｖ：０．０１〜０．２０％、Ｂ：０．０００２〜０．００５０％を含有し、（ｉ）式及び（ii）式を満足するフェライト系ステンレス鋼板。Ｃｒ＋１２Ｓｉ−４Ｍｎ−１４．５≧０ ・・・式（ｉ）ａＣｒ＋ｂＳｉ＋１．６Ｍｎ＋２７Ｔｉ＋３３Ａｌ＋１３．５≧０ ・・・式（ii）（ａ、ｂはＣｒ、Ｓｉ含有量から定まる定数）【選択図】図１