STEEL

• Main Authors: TAKAHATA ISAMU, SATO HISASHI, TOMIO AKIKO, NAGASAWA SHIN, NISHIMOTO TAKUMI
• Format: Patent
• Language: English; Japanese
• Published: 23.07.2024
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide a steel that exhibits excellent corrosion resistance in a sulfuric acid dew point corrosion environment and a weakly acidic sulfuric acid environment, while offering superior hot workability.SOLUTION: A steel has a chemical composition consisting of, in mass%, C: 0.01 to 0.10%, Si: 0.04 to 0.40%, Mn: 0.50 to 1.50%, Cu: 0.10 to 0.50%, Sb: 0.01 to 0.30%, Ni: 0.02 to 0.30%, In: 0.005 to 0.020%, Al: 0.005 to 0.050%, total of Mo and/or W: 0.01 to 0.30%, P: 0.015% or less, S: 0.015% or less, N: 0.0050% or less, and O: 0.0035% or less, with the balance being: Fe and impurities, satisfying 2.6≤(Cu/64)/((Sb/122)+(In/115))≤5.5.SELECTED DRAWING: None 【課題】硫酸露点腐食環境および弱酸性の硫酸環境において優れた耐食性を有し、かつ、熱間加工性に優れた鋼材を提供する。【解決手段】化学組成が、質量％で、Ｃ：０．０１～０．１０％、Ｓｉ：０．０４～０．４０％、Ｍｎ：０．５０～１．５０％、Ｃｕ：０．１０～０．５０％、Ｓｂ：０．０１～０．３０％、Ｎｉ：０．０２～０．３０％、Ｉｎ：０．００５～０．０２０％、Ａｌ：０．００５～０．０５０％、ＭｏおよびＷの一方または両方の合計：０．０１～０．３０％、Ｐ：０．０１５％以下、Ｓ：０．０１５％以下、Ｎ：０．００５０％以下、Ｏ：０．００３５％以下、残部：Ｆｅおよび不純物であり、２．６≦（Ｃｕ／６４）／（（Ｓｂ／１２２）＋（Ｉｎ／１１５））≦５．５を満足する、鋼材。【選択図】 なし