FERRITIC STAINLESS STEEL

• Main Authors: FUJIMURA YOSHIYUKI, HAMADA JUNICHI
• Format: Patent
• Language: English; Japanese
• Published: 24.04.2024
• 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 a ferritic stainless steel excellent in red scale resistance, designability or weldability.SOLUTION: A ferritic stainless steel is adopted. The ferritic stainless steel comprises C: 0.030% or less, Si: 0.005 to 1.20%, Mn: 0.03 to 1.2%, P: 0.05% or less, S: 0.005% or less, Ni: 0.01 to 1.0%, Cr: 12.00 to 23.00%, Cu: 0.01 to 2.0%, N: 0.030% or less, remainder: Fe and impurities, on a surface, there are an Al-based oxidized region in which the Al concentration is 10 mass% or more, and a Si-based oxidized region in which the Si concentration is 5 mass% or more, a thickness of the Al-based oxidized region is 6 nm or more, the thickness of the Si-based oxidized region is 5 nm or more, a total thickness of the Al-based oxidized region and the Si-based oxidized region is 15 nm or more and 120 nm or less, and in color difference measurement, the L* satisfies 65 or more, and the a* satisfies 0.50 or less.SELECTED DRAWING: None 【課題】耐赤スケール性に優れ、意匠性または溶接性に優れたフェライト系ステンレス鋼を提供する。【解決手段】Ｃ：０．０３０％以下、Ｓｉ：０．００５～１．２０％、Ｍｎ：０．０３～１．２％、Ｐ：０．０５％以下、Ｓ：０．００５％以下、Ｎｉ：０．０１～１．０％、Ｃｒ：１２．００～２３．００％、Ｃｕ：０．０１～２．０％、Ｎ：０．０３０％以下、残部：Ｆｅおよび不純物からなり、表面に、Ａｌ濃度が１０質量％以上であるＡｌ系酸化領域と、Ｓｉ濃度が５質量％以上であるＳｉ系酸化領域とがあり、Ａｌ系酸化領域の厚みが６ｎｍ以上、Ｓｉ系酸化領域の厚みが５ｎｍ以上、Ａｌ系酸化領域およびＳｉ系酸化領域の合計厚みが１５ｎｍ以上１２０ｎｍ以下であり、色差測定におけるＬ＊が６５以上、ａ＊が０．５０以下を満足する、フェライト系ステンレス鋼を採用する。【選択図】なし