Seamless steel pipe with hollow section, a large number of used for conveying fluid pipeline, such as conveying oil, natural gas, gas, water and some solid material pipeline.
Manufacturing methods:
According to different production methods, it can be divided into hot rolled tube, cold rolled tube, cold drawn tube, extrusion tube and so on.
1.Hot rolled seamless pipes are generally produced on automatic pipe rolling sets. The solid tube blank is checked and cleared of surface defects, cut into the required length, centering on the perforated end face of the tube blank, and then sent to the heating furnace for heating, and perforated on the punch machine. In the perforation at the same time continuous rotation and forward, under the action of the roll and the top, the tube blank gradually formed a cavity, called the wool tube. Then it is sent to the automatic pipe mill to continue rolling. Finally, the wall thickness of the whole machine is adjusted, and the sizing machine is adjusted to meet the specification requirements. It is an advanced method to produce hot rolled seamless steel tube with continuous rolling tube set.
2. If you want to obtain seamless tubes with smaller size and better quality, you must use cold rolling, cold drawing or a combination of both methods. Cold rolling is usually carried out on a two-high mill. The steel pipe is rolled in an annular pass consisting of a circular groove with a variable section and a stationary conical top. Cold drawing is usually carried out in 0.5~100T single chain or double chain cold drawing machine.
3. Extrusion method: The heated tube blank is placed in a closed extrusion cylinder, and the perforated rod moves together with the extrusion rod to extrude the extruded parts from the smaller die hole. This method can produce smaller diameter steel pipe.
Seamless steel tube material:
Ordinary and high quality carbon structural steel (Q215-A ~ Q275-A and no. 10 ~ 50 steel), low alloy steel (09MnV, 16Mn, etc.), alloy steel, stainless acid resistant steel, etc.
Species:
1.Seamless steel pipe can be divided into hot rolled pipe, cold rolled pipe, cold drawn pipe, extrusion pipe, etc.
2.According to the shape of the classification of circular tube, special-shaped tube. Special-shaped tube except square tube and rectangular tube, there are elliptical tube, semicircle tube, triangle tube, hexagonal tube, convex tube, plum tube and so on.
3.According to the different material, it is divided into ordinary carbon structure tube, low alloy structure tube, high quality carbon structure tube, alloy structure tube, stainless tube and so on.
4.Divided by special use, boiler pipe, geological pipe, oil pipe and so on.
Post time: Dec-13-2021