... surfaceB: high precision sizeC: rust prevention treatment: oiled1)Grade:20#,45#,16Mn C20,C45,St52 A106 A53 2)OD10.3mm ... 6-40mmApplied to fertilizer manufacturing industryLow & mid pressure tube10#20#GB3087-200810-426×2-40mmApplied to boiler fieldFluid pipe20#, ... #,45#,27SiMnGB/T17396-199870-377×12-40mmApplied to producing hydraulic frameworkStraight steel pipeQ235SY/T5037-2000219-2820×6-20mmApplied to ...