NEUTRON-IRRIGATE STEEL Russian patent published in 2019 - IPC C22C38/46 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to neutron absorbing steel used in nuclear power engineering as material of casing pipes of neutron absorbers in means of transporting and compacted storage of spent fuel in holding ponds. Steel contains carbon, silicon, manganese, chromium, vanadium, nickel, cerium, aluminum, boron carbide, titanium diboride, iron and unavoidable impurities at following ratio of components, wt%: carbon 0.025–0.15, silicon 0.10–0.60, manganese 0.10–0.60, chromium 13.0–16.00, vanadium 0.05–0.35, nickel 0.05–0.50, cerium 0.001–0.025, aluminum 0.005–0.025, boron carbide 0.05–0.20, titanium diboride 4.1–8.0, iron and unavoidable impurities – the rest. Steel contains boron carbide and titanium diboride in the form of particles with size of 30–80 mcm, uniformly distributed in steel matrix. Steel can additionally contain at least one element selected from the group, wt%: calcium 0.005–0.02 and zirconium 0.05–0.20. As inevitable fusible impurities, it contains lead, bismuth, stannum, antimony and arsenic with total content not exceeding 0.05 wt%. As unavoidable impurities it contains sulfur ≤0.008 wt%, phosphorus ≤0.008 wt% and oxygen ≤0.005 wt%.

EFFECT: enabling use of steel for making structures of fuel transportation and storage means with enrichment of up to 9 %.

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