seamless steel pipe can be divided into hot and cold drawn bar, but on the surface with little or no processing, seamless steel pipe several hours, with Its texture and implementation of standards, common possession of material, alloy tube, the standard for the implementation of a structure for seamless steel pipe: GB8162-99 2, transmission fluid pipe joints site: GB8163-99 3, with seamless steel tube boilers : GB3087-1999 4, with high-pressure boiler seamless: GB5310-95 (ST45.8-ⅲ type) 5, chemical fertilizers with high pressure seamless steel pipe facilities: GB6479-1999 6, geological drilling seamless steel pipe used: YB235-70 7, with seamless steel pipe oil drilling: YB528-65 8, seamless steel tubes with oil cracking: GB9948-88 9, oil drill collar seamless special: YB691-70 10, with axle vehicle Seamless Steel Tube: GB3088-1999 11, seamless steel pipe with the ship: GB5312-1999 12, cold drawn precision cold-rolled seamless steel tube: GB3639-1999 13, a variety of alloy tube 16Mn, 27SiMn, 15CrMo, 35CrMo, 12CrMov , 20G, 40Cr, 12Cr1MoV, 15CrMo by steel pipe production process is divided into different types of seamless steel tubes and welded steel pipe. Ingot by the seamless steel pipe, tube or made of perforated steel seamless steel pipe; pipe is hot Or cold-rolled steel sheet and strip made of solder volume can be straight vertical seam welding, can spiral welded.