... -pressure boilerSeamless pipes for petroleum20, 12CrMo, 15Cr1MoCr5Mo, Cr9MoGB9948-8810-530*1.5-36Boiler pipes for refinery, seamless steel pipe for pipelineLow ... ,boilingwater pipe,locomotive pipe.Fluid pipe20,Q345GB/T8163-19998-630*1.0-40Fluid feedingStructural pipe10,20,35,45,16Mn,Q345BGB/T8162 ... balance against with the copy of B/L) hot rolled alloy steel pipe