HIGHLY STRONG HEAT- AND RADIATION-RESISTANT STEEL Russian patent published in 2022 - IPC C22C38/54 C22C38/60 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely to compositions of highly strong heat- and radiation-resistant steels used as a material for the main equipment of nuclear power plants, rotors of steam turbines, base equipment for the chemical and petrochemical industry. Steel contains components in the following ratio, % wt.: carbon 0.08 to 0.12, silicon 0.01 to 0.10, manganese 0.01 to 0.10, chromium 1.0 to 1.85, nickel 5.0 to 5.5, molybdenum 0.40 to 0.70, tungsten 0.01 to 0.60, vanadium 0.10 to 0.20, nitrogen 0.0001 to 0.0080, oxygen 0.0001 to 0.0030, hydrogen 0.00001 to 0.0001, copper 0.005 to 0.03, cobalt 0.001 to 0.03, sulphur 0.0005 to 0.003, phosphorus 0.0005 to 0.003, arsenic 0.001 to 0.004, antimony 0.001 to 0.004, tin 0.001 to 0.004, bismuth 0.001 to 0.004, lead 0.001 to 0.004, aluminium 0.015 to 0.035, boron 0.001 to 0.003, optionally niobium 0.005 to 0.07, zirconium 0.005 to 0.06, and rare earth elements from a group including yttrium, neodymium, praseodymium, or a mixture thereof 0.005 to 0.07 separately or in total, the rest being iron. The total content of phosphorus, antimony, tin, bismuth, and lead is not above 0.007%, and the total content of molybdenum and tungsten is determined by the ratio 0.50%≤(Mo+W/2)≤0.80%.

EFFECT: steel has the required level of strength properties, hardening capacity, increased operating temperature, guaranteed low value of the critical brittleness temperature and increased embrittlement resistance under thermal and radiation impact.

3 cl