... ingredients, perfect furface quality, high precision casing pipe:Tubing is used to extracting petroleum and natural ... A53/A53MA, BStandard specification for Seamless Carbon Steel Pipe for high temperature serviceASTM A106A, B, CStandard ... andSeamless Carbon SteelStructural TubingASTM A501A501Alloy steel tubes for machine purposesJIS G3441SCr420TK, SCM415TK,SCM418TK,SCM420TK,SCM430TK,SCM435TK, ...