Diameter expansion and derusting of LSAW steel pipe

In addition to directly using LASW steel pipes, they will also be processed according to the purpose of construction. Related processing methods include forged steel, extrusion, rolling, and drawn steel. Forged steel is extruded into the shape and specifications we need. Extrusion is mainly used for In the production of non-ferrous metal steel, the steel is generally placed in the extrusion cylinder, extruded on one side by pressure, and then extruded through the die hole.

Straight seam steel pipe expansion is a pressure treatment technology that increases the force from the inner wall of the steel pipe by hydraulic or mechanical means to expand the steel pipe radially. The mechanical method is simpler and more effective than the hydraulic method, and has been adopted by the world's advanced large-diameter straight Seam steel control pipe expansion process is adopted.
1.Steps to expand the diameter of straight seam steel pipe
(1) In the initial circular stage, the sectors are opened until all the sectors are in contact with the inner wall of the steel pipe. At this time, the radius of the circular pipe in the steel pipe is almost the same within the step range, and the steel pipe reaches the initial circle.
(2)In the stage of nominal inner diameter, the fan-shaped block starts to decelerate from the front until it reaches the desired position, which is the circumferential position of the finished pipe required by the quality, and will be further reduced at the position of the fan-shaped block until it reaches the required position, which is the process design requirement The circumferential position of the elastic front steel tube.
(3)In the stage of pressure maintenance and stabilization, for a period of time before the rebound, the fan-shaped block at the circumferential position of the steel pipe remains unchanged. This is the stage of pressure maintenance and stabilization required by the equipment and diameter expansion process.
(4)In the unloading and returning stage, the sector block is quickly retracted from the circumferential position of the steel pipe before elastic recovery, until reaching the initial diameter position of the minimum shrinkage diameter of the sector block required for the expansion process.
2.straight seam steel pipe derusting
Rust removal is the high-speed rotation of the spray blade driven by a high-power motor. It is made of steel balls, ores and other abrasives under the strong centrifugal force on the surface of the motor. Sandblasting on straight seam steel pipes to remove oxides, rust And dirt, can also impact and rub the straight seam steel pipe under the action of abrasives, so as to achieve the required uniform roughness.