Thick-walled seamless steel pipe production manufacturing process can be divided into cold drawn, cold-rolled, hot-rolled, four basic ways of thermal expansion, pipe material is 10 #, 20 #, 35 #, 45 # asordinary steel, 16Mn the range between ordinary steel and alloy steel tubes known as low-alloy steelpipe, steel pipe material for 27SiMn of 12Cr1MoV, 10CrMo910, 15CrMo, 35CrMo and stainless steel tubereferred to as alloy steel tube. Seamless steel pipe in accordance with the uses are divided intostructure; conveyance of seamless steel pipe; boiler seamless steel tubes; boiler with a high-pressureseamless steel pipe; chemical fertilizer plants with high-pressure seamless steel pipe; exploration ofgeological brick seamless steel pipe; oil brick probe with no pipe joints; petroleum cracking; shipwith seamless steel tubes; cold-drawn cold-rolled precision seamless steel tubes; a variety of alloy tube.