| 摘要 |
PROBLEM TO BE SOLVED: To provide a high corrosion-resistant, high-strength and non-magnetic stainless steel having high corrosion resistance, high strength and non-magnetism, and is suitably used for oil well evacuation products in particular.SOLUTION: The high corrosion-resistant, high-strength and non-magnetic stainless steel contains: C: 0.01% to 0.05% by mass, Si: 0.05 to 0.50% by mass, Mn: more than 16.0% by mass but 19.0% by mass or less: P: 0.040% by mass or less: S: 0.010% by mass or less, Cu: 0.50% to 0.80% by mass, Ni: 3.5% to 5.0% by mass, Cr: 17.0% to 21.0% by mass, Mo: 1.80% to 3.50% by mass, B: 0.0010% to 0.0050% by mass, O: 0.010% by mass or less, and N: 0.45% to 0.65% by mass, with the balance substantially composed of Fe and unavoidable impurities, the steel satisfying the following equations: [Cr]+3.3×[Mo]+16×[N]≥30, [Cr]/[C]≥330, [Cr]/[Mn]>1.0 and ([Ni]+3×[Cu])/([Cr]+[Mo])>0.25. |
