... well.3, ASTM A106 For the purpose of the pipeline project of boiler,water&petroleum.4, ASTM A53 ... For manufacture wall panel,economizer,reheater,superheater and steam pipeline of boilers.Seamless pipe StandardTrademarkChemical componentsMechanical propertyCSiMnP,SCuNiMoCrVTensile ... the industries of petroleum and natural gasHydraulic prop pipe27SiMnGB/T17396-199870-377*9-40Hydraulic support and ...