HEAT-RESISTANT AND RADIATION-RESISTANT STEEL

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FIELD : metallurgy.SUBSTANCE : steel contains, wt % : carbon 0.10-0.20; silicon 0.02-0.12; manganese 0.02-0.12; chromium 1.70-2.10; nickel 3, 2-5, 00; molybdenum 0.35-0.70; vanadium 0.010-0.15; copper 0, 005-0, 03; cobalt 0.001-0.03; sulfur 0, 0005 - 0, 03; phosphorus 0.0005-0.003; arsenic 0.001-0.004; antimony 0.001-0.004; tin 0, 001-0, 004; hydrogen 0.00001-0.0001; aluminium 0.015-0.035; bismuth 0.001-0.004; lead 0.001-0.003; nitrogen 0.0001-0.008; oxygen 0.0001-0.0030; niobium 0.005-0.08; zirconium 0.005-0.04, at least one rare earth metal selected from the group consisting of yttrium, neodymium and praseodym 0.005-0.12; iron is the rest. The steel is characterized by high values of yield stress and ultimate strength at operation temperature up to 400°C.EFFECT : low values of critical brittleness temperature, high resistance to embrittlement under thermal action and neutron irradiation.2 cl