HOT ROLLED STEEL AND METHOD FOR ITS MANUFACTURE Russian patent published in 2022 - IPC C22C38/14 C21D8/02 C21D9/46 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely to a hot-rolled steel sheet used for the manufacture of structural or operational parts for oil and gas wells. The hot-rolled steel sheet has a chemical composition including the following elements, wt%: 15 ≤ nickel ≤ 25, 6 ≤ cobalt ≤ 12, 2 ≤ molybdenum ≤ 6, 0.1 ≤ titanium ≤ 1, 0.0001 ≤ carbon ≤ 0.03 , 0.002 ≤ phosphorus ≤ 0.02, 0 ≤ sulfur ≤ 0.005, 0 ≤ nitrogen ≤ 0.01, optionally at least one of: 0 ≤ aluminum ≤ 0.1, 0 ≤ niobium ≤ 0.1, 0 ≤ vanadium ≤ 0.3, 0 ≤ copper ≤ 0.5, 0 ≤ chromium ≤ 0.5, 0 ≤ boron ≤ 0.001 and 0 ≤ magnesium ≤ 0.0010, the rest is iron and inevitable impurities. The sheet has a microstructure that includes 20-40% tempered martensite, at least 60% re-formed austenite and intermetallic compounds of molybdenum, titanium and nickel in area.

EFFECT: sheet has the required mechanical properties and resistance to corrosion.

28 cl, 4 tbl