According to different production methods can be divided into hot-rolled tubes, cold-rolled tubes, cold drawn tubes, extruded tubes.
Hot-rolled seamless 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 continues to rotate and advance, under the action of the roll and the head, the cavity inside the tube gradually forms a cavity, which is called a capillary tube. Then sent to the automatic rolling mill inheritance rolling. Finally, the entire machine is evenly wall thicknessed and sizing by the sizing machine to meet the specifications. The production of hot-rolled seamless steel pipes by continuous rolling mills is a way to improve the older generation.
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-roll mill, and the steel tube is rolled in a ring shape composed of a variable-section circular hole groove and a stationary conical head. Cold drawing is usually performed at a single-chain or double-chain cold-drawing machine length of 0.5 to 100T.
In the extrusion method, the heated tube blank is placed in a sealed extrusion cylinder, and the punching rod moves together with the extrusion rod to extrude the extrusion from the smaller die hole. This method can produce small diameter precision seamless steel pipe.
Hot-rolled seamless 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 continues to rotate and advance, under the action of the roll and the head, the cavity inside the tube gradually forms a cavity, which is called a capillary tube. Then sent to the automatic rolling mill inheritance rolling. Finally, the entire machine is evenly wall thicknessed and sizing by the sizing machine to meet the specifications. The production of hot-rolled seamless steel pipes by continuous rolling mills is a way to improve the older generation.
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-roll mill, and the steel tube is rolled in a ring shape composed of a variable-section circular hole groove and a stationary conical head. Cold drawing is usually performed at a single-chain or double-chain cold-drawing machine length of 0.5 to 100T.
In the extrusion method, the heated tube blank is placed in a sealed extrusion cylinder, and the punching rod moves together with the extrusion rod to extrude the extrusion from the smaller die hole. This method can produce small diameter precision seamless steel pipe.
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