Izvedbeni standardi: GB/T8162 brezšivne jeklene cevi za strukturo, GB/T8163 brezšivne jeklene cevi za transport tekočin. 0420D in 0420E mehanske lastnosti: natezna trdnost 520~680MPa,<16 service strength 2420MPa, 16mm~30mm service strength 2400, 230mm Yield strength 2380MPa Impact test Q420D minus 20C Impact energy 234, impact test Q420E minus 40C Impact energy 227 :0.20, chromium: <0.30, nickel: <0.50, copper: 0.20, nitrogen: 0.015, :0.20, aluminum, 20.015.Q420E seamless steel pipe chemical composition: carbon: 0.20, silicon: 0.50, :1.70, phosphorus: 0.025, Sulfur: 0.020, : 0.07, : 0.20, : 0.20 Chromium: <0.30, Nickel: <0.50, Copper: <0.20, Nitrogen: 0.015, : 0.20, Aluminum, 20.015. Steel refining method: Steel should be processed by electric arc furnace Refining outside the furnace or gas converter plus outside refining method. After negotiation between the supply and demand parties, other methods with higher requirements can also be used to treat refining. When the demander requires a certain refining method, it should be stated in the contract.
Metoda izdelave cevi: Cevi se lahko proizvajajo tudi z neprekinjenim litjem, litjem v kalupe ali vročim valjanjem.
Kontinuirano lite cevi morajo biti skladne tudi s predpisi YB/T 4149; vroče cevi morajo ustrezati tudi predpisom YB/T 5221 ali YB/T 5222; kalupno ulite cevi se lahko nanašajo tudi na predpise za vroče (kovane) cevi.
