... - proportioned and stable ingredients, perfect furface quality, high precision casing pipe:Tubing is used to extracting petroleum and natural gas from ... seamlessASTM A53/A53MA, BStandard specification for Seamless Carbon Steel Pipe for high temperature serviceASTM A106A, B, CStandard specification forSeamless ... STPT480Seamless precision steel tubesDIN 17175St30Si, St30Ai, St35, St45, St52 casing pipe