RADIATION-RESISTANT AUSTENITIC STEEL FOR INTERNAL COATING FOR PRESSURIZED WATER REACTORS

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The invention refers to metallurgy of alloy steels and alloys, which are designed for use in nuclear power engineering industry during manufacture of NPP main equipment, viz. for manufacturing in-vessel baffle of pressurized water power reactors (VVER) with life less than 60 years.The technical result of this invention is the creation of austenite chromium-nickel steel having increased resistance to swelling on impact of neutron flows at doses up to 150 dpa.The technical result is attained by the fact that molybdenum, calcium and rare earth metals (REM) lanthanum and cerium have been included in addition in the composition of known steel containing carbon, silicon, manganese, chromium, nickel, titan and iron at the following ration of elements, mass % : Moreover, the following ratio must be met simultaneously for the most complete attainment of the technical result.Chromium equivalent calculated using the formula : CCrequiv=CCr+CMo+1.5*CSi+0.5*CTi, shall not exceed the value where Ccr - chromium content, mass %; CMo - molibdenum content, mass %; CSi - silicon content, mass %; CTi - titanium content, mass %.Nickel equivalent calculated using the formula : CNiequiv=CNi+30*CC+0, 5*CMn+30*CN, shall not be below the value where CNi - nickel content, mass %; Cc - carbon content, mass %; CMn-manganese content, mass %; CN - nitrogen content, mass %.The developed austenitic chromium-nickel steel with nickel content 25% allows achieve the specified technical result (increased resistance to swelling on retention of the required mechanical properties).