... boilerUsed in manufacturing by high pressure boiler tube,the collection box, steam pipe, etcASTM SA106A106 GRBsteel pipe for fluidApplicable to transmission ... ,X60,X65,X70,X80ERW STEEL PIPEUsed in general structure stents, low voltage liquid transportation, etcGB/T13793-1992GB3091-2001A53A333 GR6Sprial steel pipeApply to ...