Patent ID: 6818072
Filing Date: 2004-11-16
Classification: C21D,C22C

Abstract:
A high-strength heat-resistant steel comprisingcarbon in an amount of 0.06 to 0.15% by weight, silicon in an amount of 0.6 to 1.5% by weight, manganese in an amount of 1.5% by weight or less, vanadium in an amount of 0.05 to 0.3% by weight, chromium in an amount of 0.8% by weight or less, molybdenum in an amount of 0.8% by weight or less, at least one selected from niobium, titanium, tantalum, hafnium, and zirconium in an amount of 0.01 to 0.2% by weight, nitrogen in an amount of 20 to 200 ppm, and a balance of iron and unavoidable impurities, wherein the high-strength heat-resistant steel comprises a matrix phase consisting of a bainite-ferrite structure.