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Diameter Expansion and Rust Elimination of Straight Seam Steel Pipe

In addition to the direct use of straight seam steel pipes, it will also be processed in accordance to the goal of construction. Related processing methods consist of forging steel, extrusion, rolling, and drawing steel. Forged steel is extruded into the shape and specifications we require. Extrusion is largely utilised for In the production of non-ferrous metal steel, the steel is typically positioned in an extrusion cylinder, extruded on a single side by stress, and then extruded through a die hole.

Diameter growth of straight seam steel pipe(LSAW Steel Pipe) is a strain treatment method technologies. The force from the inner wall of the steel pipe is elevated by hydraulic or mechanical indicates to expand the steel pipe radially. The mechanical method is easier and much more powerful than the hydraulic strategy. The seam steel managed pipeline growth method is adopted. The approach is as follows: the mechanical diameter growth makes use of the segmented sector block at the end of the expander to expand in the radial path, so that the tube blank steadily realizes the whole tube length and plastic deformation along the length direction. https://postgraduthen.rmutto.ac.th/tmp/slot88/

(1) Measures to enlarge the diameter of straight seam steel pipe

1. At the initial round stage, the sectors are opened until finally all sectors are in speak to with the inner wall of the steel pipe. At this time, the radius of the round pipe in the steel pipe is almost the identical inside of the phase length, and the steel pipe reaches the first circle.

two. At the nominal inner diameter stage, the sector block decelerates from the front until it reaches the wanted position, which is the circumferential place of the finished pipe needed by the high quality, and the sector block place will additional lower until finally it reaches the preferred place.

three. The strain preserving and stabilizing stage. For the duration of a time period of time prior to the rebound, the sector block at the circumferential place of the steel pipe stays unchanged. This is the pressure sustaining and stabilizing stage required by the products and the diameter growth method.

4. In the course of the unloading and returning stage, the sector block is swiftly retracted from the circumferential place of the steel pipe before the elastic recovery, until finally it reaches the preliminary diameter place of the minimal contraction diameter of the sector block necessary for the expansion process.

(2) Rust elimination of straight seam steel pipe

Very first, use solvents and emulsions to clean the steel surface to get rid of grease, dust, lubricants and similar natural matter, but it are not able to take away the rust, oxide scale and flux on the steel surface, and can only be employed as an auxiliary means of anti-corrosion.

Rust elimination is the higher-pace rotation of the jet blade driven by a substantial-electrical power motor. It is produced of steel balls, ore and other abrasives beneath the action of strong centrifugal force on the surface of the motor, and sandblasted on the straight seam steel pipe to remove oxides and rust. And grime, it can also effect and rub the straight seam steel pipe under the action of abrasive to attain the necessary uniform roughness.

Straight seam steel pipe is a steel pipe whose weld seam is parallel to the longitudinal path of the steel pipe. Straight seam steel pipes can be divided into large-frequency straight seam steel pipes (ERW Pipe) and submerged arc welded straight seam steel pipes (LSAW) according to the production approach. Straight seam welded pipe has easy manufacturing approach, high production efficiency, lower cost and quick development.

ASTM A53 Grade B in ERW (electrical resistance welded) pipe, the weld seam of A53 erw pipe shall be completed the heat treatment with a minimum 1000°F [540°C]. In this way the no untempered martensite remains.
In situation ASTM A53 B pipe in cold expanded, then growth should not exceed 1.5% of the needed OD.

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