SUPER-THICK STEEL SHEET FOR A VESSEL WITH GOOD IMPACT STRENGTH AT LOW TEMPERATURES IN THE MIDDLE AND ITS MANUFACTURING METHOD Russian patent published in 2023 - IPC C22C38/14 C22C38/12 C21D8/02 

FIELD: metallurgy.

SUBSTANCE: invention is related to a steel sheet with a thickness of 60-100 mm, used for manufacturing pressure vessels. The sheet has a chemical composition containing in % by weight: C: 0.13-0.20, Si: ≤ 0.40, Mn: 1.00-1.60, P: ≤ 0.015, S: ≤ 0.005, Als: 0.01-0.05, Nb + V + Ti: ≤ 0.080, Ni: 0.20-0.50, Cu: ≤ 0.30, H: ≤ 2 ppm, the rest is Fe and inevitable impurities, while the following conditions are met for the steel components: CEV=C+Mn/6+(V+Cr)/5+(Ni+Cu)/15 ≤ 0.43% and 3≤(Nb+V+Als)/(Ti)≤8.

EFFECT: sheet has high strength and impact strength at low temperatures.

5 cl, 3 dwg, 3 tbl