HEAT-RESISTANT RADIATION-RESISTANT STEEL Russian patent published in 2003 - IPC

FIELD: metallurgy; heat-resistant, radiation resistant steel production. SUBSTANCE: The invention is dealt with metallurgy producing steels used in the nuclear power plants, in particular for manufacture of details for the nuclear core areas of atomic reactors on fast neutrons. The invention allows to produce the steel having a much higher level of high- temperature strength up to the temperatures within 650-710 C with preservation of a high level of resistance to brittleness in the temperatures interval of 270-400 C under conditions of a neutron irradiation. The invention presents the steel containing its components in the following ratio (mass %): carbon 0.19- 0.25; silicon 0.1-1.0; manganese 0.5-0.8; chromium 10.0-12.5; nickel 0.5-0.8; tungsten 0.5-2.0; molybdenum 0.4-1.1; molybdenum and wolfram in the sum 1.3-2.5; vanadium 0.2-0.4; niobium and-or tantalum in the sum 0.2-0.4; titanium 0.03-0.3; boron 0.002-0.006; cerium 0.001- 0.10; zirconium 0.05-0.2; nitrogen 0.02-0.15; copper ≤ 0.1; cobalt ≤ 0.01; sulfur ≤ 0.010; phosphorus ≤ 0.015; iron - the rest, at the ratio of the sum contents of vanadium, titanium, zirconium and niobium to the total sum of carbon and nitrogen from 2 up to 5. At that the total sum of impurities of the fusible metals - lead, bismuth, stannous, antimony and arsenic does not exceed 0.05 mass %. EFFECT: production of steel with much higher level of high-temperature strength - up to 650-710 C with preservation of a high level of resistance to brittleness in the temperatures interval of 270-400 C. 1 cl, 3 tbl