AUSTENITIC HEAT-RESISTANT AND CORROSION-RESISTANT STEEL Russian patent published in 2018 - IPC C22C38/58 C22C38/50 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to compositions of austenitic heat-resistant and corrosion-resistant steels used in nuclear power engineering, power engineering, machine building in installations operating for a long time at temperatures of 500÷650 °C. Steel contains the following component ratio, %wt: carbon (C) 0.01–0.06, silicon (Si) 0.3÷0.8, manganese (Mn) 1.0÷1.7, chromium (Cr) 15.0÷17.0, nickel (Ni) 10÷12, molybdenum (Mo) 2.0÷2.5, titanium (Ti) 0.05÷0.10, niobium (Nb) 0.03–0.2, nitrogen (N) 0.03÷0.10, sulphur (S) 0.01 and less, phosphorus (P) 0.015 and less, copper (Cu) 0.2 and less, calcium (Ca) 0.004–0.015, tin (Sn) 0.005 and less, antimony (Sb) 0.005 and less, arsenic (As) 0.005 and less, lead (Pb) 0.005 and less, bismuth (Bi) 0.005 and less, iron – the rest. For the steel components the following requirement is to be followed: (Nb+Ti)/C≥3.

EFFECT: increased short-term and long-term mechanical properties at high temperatures, as well as higher pitting and intergranular corrosion resistance.

1 cl, 4 tbl