Large Diameter Spiral Welded Black Carbon Steel Pipe

Welded Pipe is an electric welded Round Pipe that is an alternative to steel pipes.It is a structural grade tube that is suitable for a wide variety of applications where dimensional accuracy and precision tolerances is not a primary concern.A raised weld seam is present inside the pipe.

Spiral welded steel pipes refer to steel pipes with joints on the surface that are formed by bending and deforming steel strips or steel plates into circular or square shapes and then welding them. According to different welding methods, it can be divided into arc welded pipes, high-frequency or low-frequency resistance welded pipes, gas welded pipes, furnace welded pipes, Bondi pipes, etc. According to the shape of the weld seam, it can be divided into straight seam welded pipes and spiral welded pipes. Welded steel pipes are used in petroleum drilling and mechanical manufacturing industries. Furnace welded pipes can be used as water and gas pipes, and large-diameter straight seam welded pipes can be used for high-pressure oil and gas transportation, etc; Spiral welded pipes are used for oil and gas transportation, pipe piles, bridge piers, etc. Welded steel pipes have lower costs and higher production efficiency than seamless steel pipes.

The production of spiral welded steel pipes can reflect the advantages of high quality and high efficiency. The production capacity of one spiral welded pipe unit is equivalent to 5-8 sets of straight seam welded pipe equipment. How to make multiple pipe coiling equipment production lines meet the same production standard, that is, produce according to a unified production process specification and quality assurance system to meet welding quality Requirements and piping manufacturing grades will be anarduous task.

It is made by rolling low-carbon carbon structural steel or low-alloy structural steel strip according to a certain spiral angle (called forming angle) into a tube blank, and then welding the tube seam together. It can be made with a narrower Strip steel produces large diameter steel pipes. Its specifications are expressed by outer diameter * wall thickness, and the welded pipe shall be ensured that the hydraulic test, the tensile strength of the weld and the cold bending performance must meet the requirements.

Key Specifications/ Special Features:

1)Spiral welded pipe is the low carbon carbon structural steel and low alloy steel strip according to certain Angle of helix Angle (called molding) rolled into a tube billet, then pipe seam welding made up, it can use a narrow strip in the production of large diameter Steel Pipe.* wall thickness, according to its specifications with diameter welded pipe shall ensure that the water pressure test, the tensile strength and cold bending properties of the weld in accordance with regulations.

2)Commonly used standards of the spiral steel pipe can be divided into: SY/T5037-2000 (solid, also known as the common fluid conveying pipe with spiral seam submerged arc welding steel pipe), GB/T9711.1-1997 (national standard, also known as oil and gas industry conveying pipe delivery technical conditions in the first part: grade A steel pipe (GB/T9711.2 strict grade B steel pipe)), API 5L (American petroleum institute, also known as the pipeline steel pipe; which can be divided into PSL1 and PSL2 two levels), SY/T5040-92 (pile with spiral seam submerged arc welding steel pipe).

Product Specification

Butt-welded pipe is formed by feeding a hot steel plate through shapers that will roll it into a hollow circular shape. Forcibly squeezing the two ends of the plate together will produce a fused joint or seam.

Spiral-welded pipe is formed by twisting strips of metal into a spiral shape, similar to a barber’s pole, then welding where the edges join one another to form a seam. This type of pipe is restricted to piping systems using low pressures due to its thin walls.

Product Display

We can produce different sizes, thicknesses, widths and materials according to your requirements

Anti-corrosion processing

Our manufacturing facilities, perform three types of welding processes: ERW, LSAW, SSAW and Anti-corrosion. The facilities are fully equipped with the world's utmost advanced full auto production lines and lab test equipment which allows us to provide the quality of our product.

3LPE steel pipe blasting&coating equipment can make water gas oil supplied pipeline dia. (32-3000mm),according to customers demand. The production line make internal and external shot blasting derusting,Dual Fusion Bonded Epoxy powder/liquide Coating & PE/PP film Wrapping, End of PE grooving system and so on.

Hydrostatic test

Application Scope

Carbon welded steel pipe has high strength, which makes them ideally suitable for pressure applications within the oil & gas, petrochemical, chemical, water supply, energy, sewage treatment, vanitation pipe, pulp & paper industries, etc.

Packaging And Transportation

We offer different modes of transport depending on the customer's destination: rail transport and ship transport，etc.The Shipping Mark shall consist of: Trade mark, Seller's name, Product name, Applicable standards,Specifications, Package No., Contract No., Heat No., Production date, Weighing method, Net weight, Gross Weight, Consignee and Protection symbols, etc.