Steel for nuclear applications

摘要

The steel according to the invention consists of 0.12-0.20% by weight of carbon, 0.15-0.37% by weight of silicon, 0.3-0.8% by weight of manganese, 1.6-2.7% by weight of chromium, 0.8-2.0% by weight of nickel, 0.5-1.0% by weight of molybdenum, 0.05-0.15% by weight of vanadium, 0.002-0.08% by weight of cerium, 0.01-0.10% by weight of copper, 0.0005-0.009% by weight of antimony, 0.0005-0.009% by weight of tin, 0.001-0.02% by weight of sulphur, 0.002-0.02% by weight of phosphorus, 96.246-92.862% by weight of iron. The steel exhibits improved resistance against neutron radiation. At 300 DEG C. and neutron fluence of 1.1020 neutr./cm2, the transition embrittlement temperature increases by no more than 50 DEG C. The steel is designed for application in structural members having a wall thickness of up to 650 mm and has ultimate strength sigma B at 350 DEG C. of at least 55 kgf/mm2. The steel does not require immediate temper after welding.