petroleum pipe stock: thickness:0.2-100mm diameter:10-800mm length: ... &400 series Tubing is used to extracting petroleum and natural gas from a well. petroleum pipe stock: Standard specificationStandard No.Normal Steel ... , STPG410, STPT480Seamless precision steel tubesDIN 17175St30Si, St30Ai, St35, St45, St52 petroleum pipe stock