FERRITE STAINLESS STEEL AND METHOD FOR MANUFACTURING THE SAME

• Main Authors: HIRAIDE NOBUHIKO, YOSHIMI TOSHIHIKO
• Format: Patent
• Language: English; Japanese
• Published: 07.10.2021
• 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; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide ferrite stainless steel excellent in corrosion resistance, and a method for manufacturing the same.SOLUTION: A ferrite stainless steel includes, by mass%, C:0.150% or less, Si:2.0% or less, Mn:1.0% or less, P:0.04% or less, S:0.05% or less, Ni:0.6% or less, Cr:10.0-35.0%, Ti:0.50% or less, Nb:0.50% or less, Mo:6.0% or less, Cu:2.0% or less, N:0.005-0.035% and the remainder consisting of Fe and impurities, and a FV value represented by the formula (1) is 0.25 or more or -0.25 or less. FV=CCr+CSi+CTi-CFe-CNi-CCu-CNb-CMo... (1), where in the formula (1), CCr, CSi, CTi, CFe, CNi, CCu, CNb and CMo are cation fractions of Cr, Si, Ti, Fe, Ni, Cu, Nb and Mo in the film outermost surface layer, respectively.SELECTED DRAWING: None 【課題】優れた耐食性を有するフェライト系ステンレス鋼およびフェライト系ステンレス鋼の製造方法を提供する。【解決手段】本発明に係るフェライト系ステンレス鋼は、質量％で、Ｃ：０．１５０％以下、Ｓｉ：２．０％以下、Ｍｎ：１．０％以下、Ｐ：０．０４％以下、Ｓ：０．０５％以下、Ｎｉ：０．６％以下、Ｃｒ：１０．０〜３５．０％、Ｔｉ：０．５０％以下、Ｎｂ：０．５０％以下、Ｍｏ：６．０％以下、Ｃｕ：２．０％以下、Ｎ：０．００５〜０．０３５％、残部Ｆｅおよび不純物からなり、式（１）で表されるＦＶ値が０．２５以上または−０．２５以下である。ＦＶ＝ＣＣｒ＋ＣＳｉ＋ＣＴｉ−ＣＦｅ−ＣＮｉ−ＣＣｕ−ＣＮｂ−ＣＭｏ・・・（１）式（１）中、ＣＣｒ、ＣＳｉ、ＣＴｉ、ＣＦｅ、ＣＮｉ、ＣＣｕ、ＣＮｂおよびＣＭｏは、それぞれ、皮膜最表層における、Ｃｒ、Ｓｉ、Ｔｉ、Ｆｅ、Ｎｉ、Ｃｕ、ＮｂおよびＭｏのカチオン分率である。【選択図】なし