HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURE THEREOF Russian patent published in 2022 - IPC C21D8/02 C21D9/46 C22C38/38 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to a hot-rolled and heat-treated steel strip suitable for use as a steel sheet for producing automobiles. The hot-rolled and heat-treated steel strip contains, wt.%: 0.11 ≤ carbon ≤ 0.16, 1 ≤ manganese ≤ 2, 0.1 ≤ silicon ≤ 0.7, 0.02 ≤ aluminium ≤ 0.1, 0.15 ≤ molybdenum ≤ 0.4, 0.15 ≤ vanadium ≤ 0.4, 0.002 ≤ phosphorus ≤ 0.02, 0 ≤ sulphur ≤ 0.005, 0 ≤ nitrogen ≤ 0.01, optionally one or several elements of: 0 ≤ chromium ≤ 0.5, 0 ≤ niobium ≤ 0.05, 0.0001 ≤ calcium ≤ 0.005, 0 ≤ boron ≤ 0.001, 0 ≤ magnesium ≤ 0.0010, 0 ≤ titanium ≤ 0.01, wherein 0.3 ≤ Mo+V+Nb ≤ 0.6, iron and unavoidable impurities the rest. The microstructure of the steel sheet includes, by area, 70 to 90% bainite, 10 to 25% ferrite, wherein the total amount of bainite and ferrite is at least 90%, and the total amount of residual austenite and martensite is 0 to 10%.

EFFECT: strip is characterised by good mouldability, high strength and impact resistance.

21 cl, 4 tbl