Three-roll Bending SAW Pipes China Manufacturer

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Three-roll Bending SAW Pipes

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Payment Type:	L/C,T/T
Incoterm:	FOB,CFR,CIF
Min. Order:	10 Piece/Pieces

Basic Info

Model No.: SAW Pipes

Brand: Bangdong

Type: Seamless

Certification: UL

Application: Drill Pipe

Section Shape: Round

Surface Treatment: Polished

Usage: Construction & Decoration

Technique: ERW

Material: Alloy Steel

Additional Info

Packaging: Wooden Cases or as per buyer's requirements

Productivity: 1000pcs/month

Transportation: Ocean,Land,Air,Train/TNT/DHL

Place of Origin: Cangzhou,China

Supply Ability: 1000pcs/month

Certificate: ISO/CE/API

HS Code: 73043990

Port: Tianjin New Port,Beijing Air Port,Wuhan Train Station

Payment Type: L/C,T/T

Incoterm: FOB,CFR,CIF

Product Description

Three-roll Bending SAW Pipes

Bangdong Supply SMLS Steel Pipe,Steel Lined Pipes,SSAW Steel Pipe.The production line adopts three-roller/four-roller bending machine for forming. For the formed short pipe section, tack welding is firstly carried out by CO2 shielded arc welding, heating treatment before welding, and then internal straight welding, external straight welding, internal girth welding, and external girth welding are conducted with single wire, multi-layer and multi-pass welding. After completion of welding, the weld seam is heat preserved to reduce the weld residual stress and increase the property of stress corrosion resistance of metal. The characteristic of the production line is the wall thickness and diameter of product is large, which can be widely used for structural pipe, such as steel structural bridge, high-voltage transmission tower, sea and land wind tower, offshore platform equipment and super-long pipe piles etc.

SAW steel pipes is short of Submerged Arc Welding Steel Pipe, which it is a use of submerged arc soldering process to manufacture steel, the process produces a very high current density, the flux layer to prevent the rapid loss of heat, and concentrated in the welding region. Submerged arc weld of high quality, high production efficiency, arc and smoke a few characteristics of submerged arc Welded Pipe is widely used in pressure vessels, pipe manufacturing, beams, low pressure fluid, steel works. The main products of the SAW steel pipes LSAW Steel Pipe, Longitudinally Submerged Arc Welding Steel Pipe LSAW steel pipe, it is the use of submerged arc welding production of straight seam steel pipe.

Difference between ERW Pipes, SSAW Pipes and LSAW Pipes

Seamless Steel Pipes are mainly used in oil pipeline and gas pipeline, but seldom used in oil pipelines with long-distance. Most long distance pipeline applied ERW pipes, SSAW pipes and LSAW pipes. Here are comparisons of technological features and performance of these pipes.

1. Electric Resistance Welding Pipes

Electric Resistance Welding (ERW) pipes have two kinds of welding, induction welding and contact welding. The ERW pipe applied wide hot rolling steel profile as raw material, and went through pre-bending, continuous forming, welding, straightening, cutting and other processes. The pipe has short weld joints, high dimensional accuracy, uniform thickness, and excellent surface and can bear high pressure. However, it also has shortcomings, such small diameter and thin wall, and the weld joints are easy to be eroded. Currently, ERW pipes are mainly used to transport gas as well as oil to city residents.

2. Spiral Submerged-Arc Welding Pipes

Spiral submerged arc welded (SSAW) pipes has spiral welding joints and the pipes are welded and formed at the same time. The strip steel with the same specification can produce SSAW pipes with various diameters. The welding joints can avoid major stress and have better force resistance. Disadvantages are poor geometrical diameters; longer welding joints and joints are easily to have cracks, porosity and other welding defects. According to the design specification of oil and gas pipeline, SSAW pipes only can be used in the third and fourth class areas. Developed countries have improved the technology, apart forming and welding, and have pre-welding and precise welding processes which make the quality of welding close to UOE pipes. Currently, the domestic market doesn`t master this technology which needs to be improved. SSAW pipes produced by traditional technique are widely used in the project of natural gas transmission from West to East China. The US, Japan and Germany believe that it`s not suitable to use SSAW pipes as main trunk; Canada and Italy use it partially and Russia use it in a small scale with strict additional condition. China, due to historical reasons, still uses SSAW pipes as main trunks in majority areas.

3. Longitudinally Submerged Arc Welding Pipes

Longitudinally Submerged Arc Welding (LSAW) pipes use single plate steel as raw material, applied double-sided submerged arc welding. The finished products have larger specifications and the welding joints have excellent ductility, plasticity and good sealing. LSAW pipes have large diameter, thick wall and can withstand high pressure and low temperature. LSAW pipes play a major role in oil and gas pipelines with features of high strength, high quality and long distance. According to the standard of American Petroleum Institute (API), the LSAW pipe is the only designated pipe in large scaled oil and gas transportation, especially when the pipelines cross the densely populated urban areas and the first and second class cities.

Product standard

Standard		Code of standard
China National Standard	GB	9711.1.9253.2
American Petroleum Institute	API	5CT.5B
International Organization for Standardization	ISO	11960.10422
The United States Society for Testing and Materials	ASTM	A370.E112.E45

Product standard

Standard		Code of standard
China National Standard	GB	9711.1.9253.2
American Petroleum Institute	API	5CT.5B
International Organization for Standardization	ISO	11960.10422
The United States Society for Testing and Materials	ASTM	A370.E112.E45