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According to different production methods can be divided into hot-rolled tubes, cold-rolled tubes, cold-drawn tubes, extruded tubes.
1. Hot-rolled P91 alloy pipes are generally produced on automatic pipe mills. The solid billet is inspected and the surface defects are removed, cut to the desired length, centered on the perforated end face of the billet, and sent to a heating furnace for perforation in the perforator. At the same time as the perforation rotates and advances continuously, under the action of the roller and the head, the cavity inside the hollow tube gradually forms a cavity, which is called a capillary tube. It is sent to the automatic tube mill for further rolling. Finally, the entire machine is evenly wall thicknessed and sizing by the sizing machine to meet the specifications. The use of continuous pipe mills to produce hot-rolled P91 alloy pipes is a more advanced method.
2. If you want to obtain seamless tubes with smaller dimensions and better quality, cold rolling, cold drawing or a combination of both must be used. Cold rolling is usually carried out on a two-high mill, and the steel tube is rolled in a ring-shaped pass composed of a variable-section circular hole groove and a stationary conical head. Cold drawing is usually performed on a single-chain or double-chain cold-drawing machine of 0.5 to 100T.
3. The extrusion method is to place the heated tube blank in a closed extrusion cylinder. The perforation rod moves together with the extrusion rod to extrude the extrusion from the smaller die hole. This method produces smaller diameter steel tubes.
1. Hot-rolled P91 alloy pipes are generally produced on automatic pipe mills. The solid billet is inspected and the surface defects are removed, cut to the desired length, centered on the perforated end face of the billet, and sent to a heating furnace for perforation in the perforator. At the same time as the perforation rotates and advances continuously, under the action of the roller and the head, the cavity inside the hollow tube gradually forms a cavity, which is called a capillary tube. It is sent to the automatic tube mill for further rolling. Finally, the entire machine is evenly wall thicknessed and sizing by the sizing machine to meet the specifications. The use of continuous pipe mills to produce hot-rolled P91 alloy pipes is a more advanced method.
2. If you want to obtain seamless tubes with smaller dimensions and better quality, cold rolling, cold drawing or a combination of both must be used. Cold rolling is usually carried out on a two-high mill, and the steel tube is rolled in a ring-shaped pass composed of a variable-section circular hole groove and a stationary conical head. Cold drawing is usually performed on a single-chain or double-chain cold-drawing machine of 0.5 to 100T.
3. The extrusion method is to place the heated tube blank in a closed extrusion cylinder. The perforation rod moves together with the extrusion rod to extrude the extrusion from the smaller die hole. This method produces smaller diameter steel tubes.
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