COLD-RESISTANT STEEL FOR SPENT NUCLEAR MATERIAL STORAGE DEVICES Russian patent published in 2023 - IPC C22C38/14 C22C38/12 C22C38/08 C22C38/06 C22C38/04 C22C38/02 

FIELD: metallurgy.

SUBSTANCE: invention is related to cold-resistant structural steels for storage devices for spent nuclear materials. Steel contains, wt.%: carbon 0.04-0.08, silicon 0.03-0.30, manganese 0.20-0.40, vanadium 0.03-0.10, nickel 1.75-2, 50, molybdenum 0.15-0.30, tungsten 0.25-0.40, cerium and/or yttrium 0.005-0.02, zirconium 0.08-0.15, niobium 0.03-0.1, aluminium 0.008-0.025, gadolinium 0.15-0.55, calcium 0.001-0.025, nitrogen 0.005-0.012, barium 0.005-0.025, sulphur ≤0.008, phosphorus ≤0.008, oxygen ≤0.005, copper if necessary ≤0.05, cobalt ≤0.01 and at least one element selected from the group: lanthanum, neodymium, praseodymium and scandium 0.0005-0.04, the rest being iron and impurities. The gadolinium content is related to the manganese and nickel content by the ratio: %Gd=5(%Mn×σ_Mn+%Ni×σ_Ni)³/σ_Gd, where σ_Mn is the capture cross section of thermal neutrons by manganese, barn, σ_Ni is the thermal neutron capture cross section by nickel, barn, σ_Gd is the thermal neutron capture cross section by gadolinium, barn, %Gd - gadolinium content, wt.%, %Mn - manganese content, wt.%, %Ni - nickel content, wt.%.

EFFECT: steel has increased physical and mechanical properties and cold resistance.

2 cl, 2 tbl