HIGH-STRENGTH STEEL AND ARTICLE MADE FROM IT Russian patent published in 2019 - IPC C22C38/54 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to compositions of high-strength steels used in armor protective structures. Steel contains, wt%: carbon 0.20–0.35, silicon 0.7–1.5, manganese 0.2–1.1, chromium 0.5–1.2, nickel 1.0–1.9, molybdenum 0.05–0.45, aluminum 0.005–0.15, nitrogen not more than 0.02, copper not more than 0.5, titanium 0.001–0.3, vanadium not more than 0.4, niobium 0.001–0.3, boron is not more than 0.015, iron is rest. Steel can additionally contain, wt%: not more than 0.0005 oxygen, not more than 0.0005 hydrogen, not more than 0.25 arsenic and not more than 0.015 tin, lead, zinc and antimony each. Steel has a martensite-bainite structure with residual austenite content of up to 5 %, wherein the microstructure contains non-metallic inclusions with average size of not more than 10 mcm.

EFFECT: high-strength steel and article made from it are proposed.

7 cl, 3 tbl