steel

Abstract

The present invention provides a steel material that exhibits excellent corrosion resistance in both strongly acidic and weakly acidic environments, and also maintains excellent hot workability even when the Ni content is reduced. [Solution] A steel material whose chemical composition, in mass%, is C: 0.03~0.15%, Si: 0.05~1.00%, Mn: 0.40~1.20%, Cu: 0.10~1.00%, Cr: less than 0.05%, Ni: 0.01~0.10%, Co: 0.010~0.100%, Al: 0.010~0.100%, P: 0.020% or less, S: 0.010% or less, the remainder being Fe and impurities, and which satisfies 0.20 ≤ ((Co / 59) + (Sn / 119) + (Sb / 122)) × 1000 ≤ 3.80.

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