The Derusting Method of ERW Steel Pipe

In the oil and gas pipeline corrosion in the construction process, straight seam steel pipe anti-corrosion surface treatment is to determine the life of one of the key factors, it is ERW steel pipe coating with the premise of whether the combined firm. The study of professional organizations, in addition to the life of the coating depends on coating type, coating quality and construction of environmental factors, ERW steel pipe coating surface treatment of life-span of about 50%, therefore, should be strictly in accordance with corrosion layer specification for ERW steel pipe surface, continually improve the surface treatment straight seam steel pipe, ERW steel pipe in addition to embroidery methods are mainly the following:

1, cleaning
The use of solvents, emulsion cleaning steel surfaces to achieve the removal of oil, grease, dust, lubricants and similar organisms, but it can not remove the steel surface rust, oxide, welding flux, etc., so the anti-government operations only as a supplementary means.

2, pickling
Generally two methods used to do chemical and electrolytic pickling process,  corrosion coating steel pipe using only chemical pickling, to remove oxidation, rust, old coatings, sometimes used as a sand-blasting after reprocessing. Although chemical cleaning can achieve a certain surface cleanliness and roughness, but the anchor pattern light, and easy to pollute the surrounding environment.

3, tools rust
Mainly use a wire brush and other tools on the polished steel surface, can remove loose oxide, rust, welding slag. Hand tools rust can reach Sa2 level, power tools rust can be achieved Sa3 level, if attached to a solid steel surface oxide scale, the effect is not ideal tools rust, corrosion reach the construction requirements of the anchor pattern depth.

4, spray rust
Jet blasting through high-power high-speed rotary motor driven jet blades, so that steel shot, grit, wire segments, minerals and other abrasive strong centrifugal force in the motor straight seam steel pipe under the surface of spray treatment, not only the elimination of oxide , rust and dirt, and straight seam mild steel pipe in severe abrasive impact and role of friction, but also to achieve the required uniform roughness. Spray rust, the surface of the tube can not only expand the role of physical adsorption, and can enhance the surface of the pipe coating and mechanical adhesion. Therefore, the spray rust rust is the ideal way to pipe corrosion. In general, within the tube is mainly used for blasting rust surface treatment, shot blasting straight seam steel pipe used primarily outside the surface.

Stringent requirements of the production process to be rust-related technical indicators, to prevent operational errors caused by the land of straight seam steel pipe second injury, DSAW steel pipe through the addition embroidery, embroidered products in addition to appearance and it will be more smooth than before, in addition to straight seam steel pipe embroidered in the steel industry is a frequently used technique.