API 5L X52 X70 Spiral Welded Steel Pipe Double Submerged Arc Welding

Production Information : API 5L X 52, X60, X65, X70 WELDED PIPES AND TUBES (ERW, EFW, DSAW)

Welded pipe sizes and dimensions

Welded pipes are used especially for pipeline constructions and for larger dimensions in the process plants; any specifications and qualities are part of our supply program.

For example, we supply carbon steel pipes for pipeline projects throughout the world according to:

• API 5L X 52, X60, X65, X70

Welded carbon and alloyed process plant pipes in acc. to below standards:

• ASTM A333, 671, 672, 691

Welded Stainless steel, special alloys pipes for chemical and petrochemical plants to:

• ASTM A 312, 358, 778, 928, ASTM B 619, B725

All materials are also available in acc. to equivalent DIN/ EN standards and grades.

Welded pipe manufacturing

At the start of the welded pipe manufacturing process so called slabs or billets are cast in a steel mill. Dependent on the external dimensions and wall thickness there are different methods of producing

welded pipes and tubes: Electric Resistance Welding (ERW), Fusion Welding (EFW) and Double Submerged Arc Welding (DSAW).

In the ERW and EFW manufacturing process welded pipes are formed by hot or cold rolling plate and welding the seam.

In order to keep the outside (O.D.) surface of a welded pipe smooth and uniform a cutting tool called scarfing blade is used to remove the weld flash. Scarfing from the inside (I.D.) welded flash is also possible.

With a heat treating at the end of the manufacturing process the weld zone of the steel pipe can be made less visible.

Due to the weld seam lower operating pressures are stated in accordance with ASME compared to seamless pipes.

In general welded tubes possess tighter dimensional tolerances than seamless pipes and are less costly if produced in same quantities.

ERW Pipe Pictures

Best Alloy Engineering Alloy Pipe as s a reference point for excellence in

the manufacture and distribution of fittings, piping, bends, forged flanges , clad products and specialties

for the upstream, midstream and downstream sectors of oil & gas, thermal and nuclear power generation.

The Company was founded in 1996 on the buttwelding fittings , forged flanges and steel pipes

with the aim of becoming a one-stop solution partner for their clients.

Best Alloy Engineering Alloy Pipe is one group company !

The company ’s business model is characterized by complete control of the supply chain, with

integrated production, stock and distribution operations. A strong market image reinforced by

genuine trust has enabled very rapid growth in all areas of the world.

It fixes assets of 8 million dollar, covers an area of 60,000 square meters.

In Best Alloy Pipe Engineering , there are more than 150 employees

with strong technical faculty in our company ,including 15 engineers, and 16 technicians.

Owning advanced flanges and tube supporting the production lines, the company has high technology skills in

forge and press, If push system, machining, cold forming, hot extrusion and heat treatment .

In addition, our factory also has the capabilities of chemical analysis, metallurgical analysis,

physical experiment, nondestructive testing and other advanced detection. Therefore, Best

Pipeline could produce different ranges of stainless steel, alloy steel, carbon steel flanges,

elbows, tees, reducers, caps, big bend, the socket series of pipeline components with high and

medium pressure, and various specifications, material steel pipe according to international and

domestic standards.

Best Alloy Pipe has a manufacturing license in the field of

the petroleum, petrochemical, chemical, shipbuilding and other industries. The products have been widely used

in marine, power generation, natural gas, chemicals, chemical, petroleum, pharmaceutical, coal, aviation,

construction, water supply and many other fields.

In 2003, the company has provided a lot of well-known foreign trade enterprises to the domestic

OEM products, and several foreign guests of audits and visits, which makes the company win the

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it has obtain the right to import and export goods in 2004, developing a direct business dealings

with Germany , Poland , Belgium , the United States, Russia, Australia, Brazil, Iran, Dubai, Paraguay,

Chile, Argentina, and more than 40 other countries. Now Best Pipeline has grown into a star company

gathered production, manufacturing, domestic and foreign sales of other diversified businesses.

Best Pipeline uses high-quality products and good service to establish a good corporation image

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The company will always insist on putting science and technology in the first and make every

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The company will always pursuit excellence along with the brilliant corporation spirit, and always

adhere to the purpose of "Quality first, Customer satisfaction", to provide customers with qualified

products and good service