| 摘要 |
The invention concerns a steel composition comprising, expressed in weight percentages: 0.25-0.35% of C, 24-28% of Cr. 10-15% of Ni, 3-6% of Mn, 1.75-2.50% of Nb, 0.50-0.70% of N, 0-0.30% of Si, provided that C+N>=0.8%, the rest consisting mainly of iron and unavoidable impurities. The invention also concerns a method for making said compositions and valves produced from said compositions or using said method and exhibiting excellent mechanical strength and oxidation resistance at temperatures between 800 and 900° C.
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