1. It is divided into P91 alloy pipe hot rolled pipe, P91 alloy pipe cold rolled pipe, P91 alloy pipe cold drawn pipe, P91 alloy pipe extruded pipe, etc. The solid pipe blank is checked and cleaned of surface defects, cut into the required length, sent to the heating furnace for heating and perforated on the piercer. At the same time of perforation, it rotates and advances continuously. Under the action of roll and plug, the tube blank gradually forms a cavity, which is called rough tube. P91 alloy pipe is then sent to the automatic pipe mill for continuous rolling, and then the wall thickness is adjusted by the homogenizer, and the diameter is determined by the sizing machine.
2. If P91 alloy pipe requires smaller pipe fittings, P91 alloy pipe shall be cold rolled, cold drawn or both. P91 alloy pipe is usually cold rolled on a two high mill. P91 alloy pipe is rolled in an annular pass composed of circular groove and plug. The cold drawing of P91 alloy pipe is usually carried out on a single chain or double chain cold drawing machine.
3. P91 alloy pipe extrusion method is to place the heated pipe blank in a closed extrusion cylinder, and the perforated rod moves with the extrusion rod to extrude the extrusion part from the smaller die hole. This method can produce steel pipe with smaller diameter.
Post time: Jan-04-2022