AUSTENITIC STAINLESS STEEL SHEET FOR EXHAUST COMPONENT EXCELLENT IN HEAT RESISTANCE AND SURFACE SMOOTHNESS AND MANUFACTURING METHOD THEREFOR

PROBLEM TO BE SOLVED: To provide an austenitic stainless steel sheet which is a raw material of a heat resistant component requiring especially excellent surface smoothness.SOLUTION: There is provided an austenitic stainless steel sheet for an exhaust component excellent in heat resistance and surface smoothness, containing, by mass%, C:0.005 to 0.20%, Si:0.1 to 4.0%, Mn:0.1 to 4.0%, P:0.01 to 0.05%, S:0.0001 to 0.010%, Ni:5 to 25%, Cr:15 to 30%, N:0.01 to 0.30%, Al:0.005 to 1.0%, Cu:0.1 to 3.0% and the balance Fe with inevitable impurities and having inclusion cleanliness of 0.025% or less, crystal grain size number of 6 or more and surface roughness of 0.06 μm or less by center line average roughness (Ra).SELECTED DRAWING: None 【課題】特に優れた表面平滑性が要求される耐熱部品の素材となるオーステナイト系ステンレス鋼板を提供する。【解決手段】質量％で、Ｃ：０．００５〜０．２０％、Ｓｉ：０．１〜４．０％、Ｍｎ：０．１〜４．０％、Ｐ：０．０１〜０．０５％、Ｓ：０．０００１〜０．０１０％、Ｎｉ：５〜２５％、Ｃｒ：１５〜３０％、Ｎ：０．０１〜０．３０％、Ａｌ：０．００５〜１．０％、Ｃｕ：０．１〜３．０％を含有し、残部がＦｅ及び不可避的不純物からなり、介在物清浄度が０．０２５％以下、結晶粒度番号が６以上、表面粗度が中心線平均粗さ（Ｒａ）で０．０６μｍ以下であることを特徴とする耐熱性と表面平滑性に優れた排気部品用オーステナイト系ステンレス鋼板。【選択図】なし