STEEL

摘要

The invention relates to metallurgy, in particular to steels which have a high toughness at negative temperatures, a good weldability, embrittlement and corrosion resistance, a high-temperature resistance and which can be used for oil and gas products pipelines, offshore platforms, welded structures, pressure vessels, different technical devices and the elements thereof operating at a temperature ranging from minus 100 °C to plus 450 °C. The inventive steel comprises carbon, manganese, silicium, chromium, nickel, vanadium, niobium, titanium, aluminium, calcium, sulphur, phosphorus, nitrogen, copper, stibium, stannum, arsenic and iron and in addition molybdenum at the following component ratio: 0.02 mass % carbon, manganese 0.10-1.8 mass %, 0.06-0.6 mass % silicium, 0.005-0.30 mass % chromium, 0.005-1.0 mass % nickel, 0.01-0.12 mass % vanadium, 0.02-0.10 mass % niobium, 0.01-0.04 mass % titanium, 0.01-0.05 mass % aluminium, 0.0005-0.008 mass % calcium, 0.0005-0.008 mass % sulphur, 0.001-0.012 mass % phosphorus, 0.001-0.012 mass % nitrogen, 0.005-0.25 mass % copper, 0.0001-0.005 mass % stibium, 0.0001-0.007 mass % stannum, 0.0001-0.008 mass % arsenic, 0.0001-0.5 mass % molybdenum, the rest being iron. The total nickel and manganese mass % content is bound with the molybdenum and phosphorus mass % content according to a ratio (I).