COLD-RESISTANT STEEL Russian patent published in 2018 - IPC C22C38/08 C22C38/16 C22C38/60 

FIELD: metallurgy.

SUBSTANCE: invention relates to steels for the manufacture of structures for storage, transportation and processing of liquefied hydrocarbons and products operating at cryogenic temperatures -120…-196 °C. Steel contains 0.03–0.07 % of carbon by weight, 0.02–0.20 % of silicon by weight, 0.02–0.30 % of manganese by weight, 4.8–7.2 % of nickel by weight, 0.20–0.40 % of molybdenum by weight, 0.0005–0.60 % of copper by weight, 0.0005–0.02 % of vanadium by weight, 0.0005–0.06 % of niobium by weight, 0.0002–0.012 % of nitrogen by weight, 0.015–0.035 % of aluminum by weight, 0.0005–0.006 % of sulfur by weight, 0.0005–0.010 % of phosphorus by weight, 0.01–0.80 % of chromium by weight, 0.0002–0.002 % of oxygen by weight, 0.00001–0,0002 % of hydrogen by weight, 0.0005–0.004 % of arsenic by weight, 0.0005–0.004 % of tin by weight, 0.0005–0.004 % of antimony by weight, 0.0005–0.004 % of bismuth by weight, iron – the rest.

EFFECT: cold-resistant steel with bainitic martensitic structure has good weldability and increased viscoplastic characteristics.

7 cl, 1 tbl