... material:WPB GR.B TypeApplicationStandardMaterialalloy steel pipeit is used in petroleum,chemical,electric power,boiler etc ... resistance,Corrosion resistanceASTM SA335 A335P22A335P5A335P9A335P91stainless steel pipe Applies to oil, aviation, metallurgy, food, water conservancy,electric power ... scaffolds, mechanicalASTM A53A53 Bpipeline steel pipeUsed in oil and natural gas industry in order to transmit ...