HIGH-STRENGTH LOW-MAGNETIC NON-STABILIZED WELDABLE STEEL, RESISTANT TO LOCAL CORROSION IN ZONES OF THERMAL AFFECT OF WELDING AND PROLONGED HEATING IN THE AREA OF HAZARDOUS TEMPERATURES Russian patent published in 2022 - IPC C22C38/58 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely to unstabilized austenitic corrosion-resistant low-magnetic weldable steels with a yield strength of more than 350 N/mm², used in shipbuilding, hydropower and nuclear power engineering in the manufacture of welded structures operating in contact with sea water and other chloride-containing media. Steel contains in wt.%: carbon 0.005-0.04, silicon 1.5-2.2, manganese from more than 2.0 to less than 5.0, chromium 18.0-22.0, nickel 12.0-17 .0, molybdenum 2.0-3.5, nitrogen 0.10-0.22, vanadium 0.01-0.15, niobium from 0.005 to less than 0.05, boron 0.0005-0.008, calcium from more than 0 0.02 to 0.15, cerium from 0.001 to less than 0.01, iron and inevitable impurities - the rest. For steel components, the following ratios hold: ([Cr]+[Mo]+1,5[Si])/([Ni]+0,5[Mn]+30[N+C])=1,08-1,14 и (Nb+V)/(N+C)≤1,30.

EFFECT: required mechanical properties and a decrease in the magnetic permeability of steel are provided while maintaining its austenitic structure and guaranteed elimination of the tendency to sensitization, intergranular corrosion, pitting corrosion and corrosion cracking.

1 cl, 1 dwg, 2 tbl