Anti-corrosion surface treatment process of spiral pipe

Anti-corrosion steel pipe in the country is mainly used for petroleum, chemical, gas, heat, sewage treatment, water, bridges, steel pipes and other engineering fields.anti-corrosion steel pipe is divided into the following categories.

Typically the metal surface will be accompanied by dust oxide corrosion layer of oil contaminants salt or old paint. Dense oxide layer is an oxide layer formed in the forging steel produced by high temperature, usually attached relatively firmly, but more brittle than the steel itself, and the cathode itself, will accelerate corrosion of metal. It do not remove these substances directly affect paint adhesion of the entire layer.

Spiral steel pipe in the actual construction, long-term contact with liquid, air, soil and other media, so it need to add a layer of protection for products on corrode the metal surface to prevent corrosion and prolong the life spiral.

Spiral steel pipe into the pipe unit, the multi-channel rolling rolls, gradually rolled strip, a gap is formed with a circular opening tube, squeeze rollers to adjust the amount of reduction, so that a gap control in ~ 3mm, and to weld the ends flush.

(1)If the gap is too large, resulting in reduced proximity effect, lack of eddy heat weld together indirectly arising crystal fusion or cracking are not bad.

(2)If the gap is too small, causing the proximity effect increases, excessive heat welding, weld cause burning; or weld extruded to form a pit after rolling, affecting the quality of the weld surface.

After heating the two edges of the tube to the welding temperature, the lower squeeze rollers squeeze the metal grains to form a common mutual penetration, crystallization, forming a solid weld. If spiral pipe extrusion pressure is too small, the crystal is formed on the small number of common weld metal strength decreases, the cracking force; if the pressing force is too large, will make the extruded molten weld metal, not only reduces the weld strength, and will generate a lot of internal and external burrs, and even cause the welding seam defects ride.

Welded pipes by manufacturing process

Sunny Steel produce an extensive selection of welded steel pipe including ERW, HFI, EFW, LSAW, DSAW and UOE type carbon steel pipe along with their respective flanges and fittings.

Electric Resistance Welded Pipe
High Frequency Induction (HFI) Welded Pipe
UOE (Uing and Oing forming) Pipes

English Inglés SpanishEspañol

Contac Us

Sunny Steel Blog


Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

Link exchange

Copyright © 2011 Sunny Steel Enterprise Ltd.  All Rights Reserved ICP No.:08010763