ERW welded steel pipe: high-frequency resistance welded pipe, made of hot-rolled steel plate, through continuous forming, bending, welding, heat treatment, sizing, straightening, cutting and other processes.
Features: Compared with spiral seam submerged arc welded steel pipe, it has the advantages of high dimensional accuracy, uniform wall thickness, good surface quality and high pressure resistance. But the disadvantage is that it can only be used to produce small diameter thin-walled pipes. Widely used in urban gas, crude oil transportation and other fields.
Spiral submerged arc welded steel pipe: spiral submerged arc welded steel pipe. In the rolling process, a forming angle is formed in the rolling direction, and then a welding process is carried out after the rolling process. The final product has a spiral weld.
Features: The advantages are that steel pipes with the same specifications and different diameters can be produced, the raw material range is wider, and the weld can avoid the principal stress and obtain a good stress state; Disadvantages are poor geometric size, longer weld length than straight seam steel pipe, and welding defects such as cracks, air holes and slag inclusion occur from time to time. The welding stress is in a state of tensile stress. According to the Code for Design of General Long-distance Oil and Gas Pipelines, spiral submerged arc welding can only be used in Class 3 and Class 4 areas.
Longitudinal submerged arc welded steel pipe: longitudinal submerged arc welded steel pipe, production process: first roll the steel plate into a tube with a mold or forming machine, and then double submerged arc welded.
Features: The product has the advantages of wide size range, high toughness, good plasticity, good uniformity and good compactness. In the construction of long-distance oil and gas pipelines, longitudinal submerged arc welding pipes are required. According to API 5L standard, it is the only designated steel pipe type in cold areas, oceans and densely populated urban areas.
Advantages of seamless steel pipe
Thick wall and thickness.
No weld. It is generally considered to have better property and corrosion resistance.
Seamless pipes have better ellipticity or roundness.
How to choose welded or seamless steel pipes?
Although welded pipe has many advantages, seamless pipe is still better than welded pipe, especially in rough environment, because it has higher strength, higher pressure and better corrosion resistance.
According to the specific application and cost, decide which type is better.
According to the application requirements, seamless and welded pipes can be produced.
Different applications of seamless pipe and welded pipe
Seamed steel pipe: welded pipe is mainly used in water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction. Liquid transportation: water supply and drainage. Used for natural gas transportation: natural gas, steam, liquefied petroleum gas. Structure: piling pipes, bridges, docks, roads, building structural pipes, etc.
Seamless steel pipe: Seamless steel pipe has a hollow cross section and is widely used to transport fluids, such as oil, natural gas, natural gas and water, and some solid materials. Compared with solid steel such as round steel, steel pipe is lighter in weight under the same bending and torsion strength, so it is an economic section steel.
If you’re thinking about purchasing SEAMLESS PIPE, ERW PIPE, SSAW PIPE OR LSAW PIPE, see the options JINDALAI has for you and consider reaching out to our team of for more information. We will give you the best solution for your project.
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Post time: Mar-16-2023