Steel composition exhibiting excellent mechanical strength and oxidation resistance at temperatures between 800 and 900 degrees Celsius

摘要

Steel composition comprises by weight, 0.25 0 0.35 % C, 24 - 28 % Cr, 10 - 15 % Ni, 3 - 6 % Mn, 1.75 - 2.50 % Nb, 0.50 - 0.70 % N, 0 - 0.30 % Si with the rest being iron and unavoidable impurities. It is also typified in that the relationship between the carbon and nitrogen is governed by the ratio C + N is greater than or equal to 0.8 %. Independent claims are included for method of producing this steel, components made in this steel and its utilisation for the fabrication of valves for motors operating in marine environments.