Steel 22K
Designation
Description
Steel 22K is used: for the manufacture of forgings of various parts of General machinery; type details of bottoms, shells, collar flanges, forged and welded drums of steam boilers, fittings, rings, tubes, tees and parts of rectangular shape for power equipment and pipelines with an absolute pressure of more than 3.9 MPa, thermal power plants and for operation at temperatures from -40 °C to +450 °C; vessels, working under pressure; equipment of nuclear power plants.
Standards
Chemical composition
Fe is the basis.
According to GOST 5520-79, the mass fraction of arsenic can be up to 0.15% in the smelting of steel from the Kerch ore, while the mass fraction of phosphorus should not be more than 0.030%. At the request of the consumer, the mass fraction of sulfur should not exceed 0.025, 0.030 or 0.035%, and phosphorus 0.030 or 0.035%. When steel is smelted in electric furnaces, the mass fraction of nitrogen must be ≤ 0.012%.
According to TU 108.11.917-87, after processing the steel on the OSRV, a limitation on the sulfur content ≤ 0.015% and phosphorus ≤ 0.015% is introduced. The total content of sulfur and phosphorus after OSRV ≤ 0.020%.
According to TU 302.02.092-90 the chemical composition is given for steel grade 22K; in steel grade 22KM carbon weight fraction of 0.17-0.24%, manganese 0.35-0.65, the mass fractions of the remaining elements are identical to the brand 22K. At the direction of the metallurgy department of the manufacturer, when adding steel as a technological additive, ferro-titanium additive is allowed not more than 0.050% titanium, or ferrovanadium not more than 0.050% vanadium (calculated), or vanadium not more than 0.050% and titanium not more than 0.030% simultaneously (taking into account the residual vanadium in steel). The content of titanium, vanadium and aluminum in the ladle sample is determined, entered in the certificate, but is not a delivery. The content of nickel (by agreement) is not more than 0.50%. After treatment with OSRP, the total content of sulfur and phosphorus in the steel should not be more than 0.020%. In electric steel, as well as in the metal of ESR and VDP, obtained by remelting electric steel, the nitrogen content should not be more than 0.012%.
According to GOST 5520-79, the mass fraction of arsenic can be up to 0.15% in the smelting of steel from the Kerch ore, while the mass fraction of phosphorus should not be more than 0.030%. At the request of the consumer, the mass fraction of sulfur should not exceed 0.025, 0.030 or 0.035%, and phosphorus 0.030 or 0.035%. When steel is smelted in electric furnaces, the mass fraction of nitrogen must be ≤ 0.012%.
According to TU 108.11.917-87, after processing the steel on the OSRV, a limitation on the sulfur content ≤ 0.015% and phosphorus ≤ 0.015% is introduced. The total content of sulfur and phosphorus after OSRV ≤ 0.020%.
According to TU 302.02.092-90 the chemical composition is given for steel grade 22K; in steel grade 22KM carbon weight fraction of 0.17-0.24%, manganese 0.35-0.65, the mass fractions of the remaining elements are identical to the brand 22K. At the direction of the metallurgy department of the manufacturer, when adding steel as a technological additive, ferro-titanium additive is allowed not more than 0.050% titanium, or ferrovanadium not more than 0.050% vanadium (calculated), or vanadium not more than 0.050% and titanium not more than 0.030% simultaneously (taking into account the residual vanadium in steel). The content of titanium, vanadium and aluminum in the ladle sample is determined, entered in the certificate, but is not a delivery. The content of nickel (by agreement) is not more than 0.50%. After treatment with OSRP, the total content of sulfur and phosphorus in the steel should not be more than 0.020%. In electric steel, as well as in the metal of ESR and VDP, obtained by remelting electric steel, the nitrogen content should not be more than 0.012%.