CHROMITE RADIATION-RESISTANT STEEL FOR NUCLER PILES ON FAST NEUTRONS Russian patent published in 2009 - IPC C22C33/02 C22C38/54 C22C38/32 B82B1/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy field, particularly to chromite radiation-resistant steel used for manufacturing of fuel assembly casing (FAC) of fast neutron reactors, and also bushing casing of reactor control system of neutron source (RCS), fuel cladding (fuel elements) and other structural components of active area of nuclear pile. Steel contains carbon, silicon, manganese, chrome, nickel, molybdenum, vanadium, niobium, calcium, boron, uniformly distributed in grains nano-sized yttrium oxide, iron and concomitant admixtures, at following components ratio, wt %: carbon 0.09 - 0.15, silicon 0.25 - 0.50, manganese 0.20 - 1.0, chromium 11.0 - 13.5, nickel 0.05 - 0.3, molybdenum 1.4 - 2.0, vanadium 0.10 - 0.30, niobium 0.15 - 0.50, boron 0.004 - 0.015, calcium 0.001 - 0.05, yttrium oxide 0.1 - 0.3, iron and concomitant admixtures are the rest. It is increased serviceability and safety of pile by means of increasing operation strength of products up to damaging dose 130-180 sone and operation temperatures 650-710°C.

EFFECT: increasing of serviceability and safety of pile by means of increasing operation strength of products.

2 dwg, 1 tbl