STEEL

To provide a steel having corrosion resistance in an acid corrosive environment, and also excellent hot and cold workability.SOLUTION: A steel has a chemical composition consisting of, in mass%, C: 0.0010-0.15%, Si: 0.10-0.80%, Mn: 0.50-1.00%, Cu: 0.10-0.50%, Ni: 0.010-0.80%, Cr: 0.005-0.070%, Co: 0...

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Bibliographische Detailangaben
Hauptverfasser: SAWADA SHINYA, SATO HISASHI, KAWABATA NORIMASA, KODAMA MASAYUKI, IMAMURA JUNKO, NAGASAWA SHIN, NISHIMOTO TAKUMI
Format: Patent
Sprache:eng ; jpn
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Beschreibung
Zusammenfassung:To provide a steel having corrosion resistance in an acid corrosive environment, and also excellent hot and cold workability.SOLUTION: A steel has a chemical composition consisting of, in mass%, C: 0.0010-0.15%, Si: 0.10-0.80%, Mn: 0.50-1.00%, Cu: 0.10-0.50%, Ni: 0.010-0.80%, Cr: 0.005-0.070%, Co: 0.002-0.020%, Mo and/or W: 0.001-0.30% in total, Al: 0.01-0.10%, Ti: 0.001-0.067%, N: 0.0005-0.0050%, P: 0.050% or less, S: 0.00050-0.0200%, O: 0.0010-0.0045%, the balance Fe and impurities, with FI: 0.12-1.50. The steel comprises MnS and MnS oxide. The number density of MnS is less than 50.0/mm2. Relative to the number density of MnS, the number density of MnS oxide is 0.10 or more.SELECTED DRAWING: None 【課題】酸腐食環境において耐食性を有し、かつ、熱間加工性および冷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:0.0010~0.15%、Si:0.10~0.80%、Mn:0.50~1.00%、Cu:0.10~0.50%、Ni:0.010~0.80%、Cr:0.005~0.070%、Co:0.002~0.020%、MoおよびWの一方または両方:合計で0.001~0.30%、Al:0.01~0.10%、Ti:0.001~0.067%、N:0.0005~0.0050%、P:0.050%以下、S:0.00050~0.0200%、O:0.0010~0.0045%、残部:Feおよび不純物であり、FI:0.12~1.50であり、鋼材中にMnSおよびMnS酸化物を含み、MnSの個数密度が50.0/mm2未満であり、MnSの個数密度に対する、MnS酸化物の個数密度の比が0.10以上である、鋼材。【選択図】 なし