| 摘要 |
A Cr steel for structural use, characterized in that it has a chemical composition: C: 0.002 to 0.02 %, N: 0.002 to 0.02 %, Si: 0.05 to 1.0 %, Mn: 0.05 to 1.0 %, P: 0.04 % or less, S: 0.02 % or less, Al: 0.001 to 0.1 %, Cr: 6.0 to 10.0 %, preferably Cu: 0.1 to 1.0 %, preferably one or more selected from Ni: 0.1 to 1.0 % and Mo: 0.1 to 1.0 %, preferably one or more selected from Nb: 0. 005 to 0.10 % and V: 0.005 to 0.20 %, and the balance: Fe and inevitable impurities, and in that the surface of a steel plate has a Cr concentration of (that at an inner portion of the plate - 1 %) or more; and a method for producing the Cr steel. The Cr steel for structural use is excellent in toughness at a low temperature and impact resistance, can be produced at a cost lower than that for a stainless steel, and also exhibits satisfactory corrosion resistance.
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