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How much do you know about LSAW Steel Pipe?

Dec. 16, 2019

LSAW Steel Pipe is a professional term for LSAW steel pipe. LSAW steel pipe is produced from a single medium and heavy plate, which is pressed into a tube blank in a mold or forming machine, and is expanded by double-sided submerged arc welding. The finished product has a wide range of specifications, good toughness, plasticity, uniformity and compactness of the weld, and has the advantages of large pipe diameter, pipe wall thickness, high pressure resistance, strong resistance to low temperature and corrosion. When constructing high-strength, high-quality long-distance oil and gas pipelines, most of the steel pipes required are large-caliber thick-walled straight seam submerged arc welded pipes. According to API standards, in large oil and gas pipelines, straight seam submerged arc welded pipes are the only designated applicable pipe type when passing through Class 1 and Class 2 areas such as the alpine zone, the seafloor, and densely populated urban areas.

LSAW Steel Pipe

LSAW Steel Pipe

As an LSAW Steel Pipe Supplier, I will introduce to you the different molding methods which can be divided into:

UOE steel pipe: After pre-bending a single steel plate, it undergoes U-forming, O-forming, internal welding, external welding, mechanical cold expansion and other processes.

JCOE steel pipe: Pre-welding, forming according to "J-C-O-E", cold expansion after welding, etc.

HME steel pipe: It is formed by "C-C-O" by mandrel rolling method, and cold expanded after welding.

Submerged arc welding is a method in which the arc is burned under the flux layer for welding. Its inherent welding quality is stable, welding productivity is high, no arc light and little smoke and so on, making it the main welding method in the production of important steel structures such as pressure vessels, pipe sections and box beams. Although there have been many new and high-quality welding methods, the application of submerged arc welding has not been affected. From the perspective of the weight of the deposited metal by various welding methods, submerged arc welding accounts for about 10%, and has not changed much over the years.

When the welding wire is determined, the supporting flux becomes the key material, which directly affects the mechanical properties of the weld metal, crack resistance, incidence of welding defects, and welding productivity. The matching weight ratio of welding wire to flux is welding wire: flux = 1.1 to 1.6, depending on the type of welding joint, the type of flux used, and welding specification parameters. Compared with smelting flux, the amount of sintered flux is more economical, which can be reduced by about 20%.

The amount of solder used in our country fluctuates around 50,000 tons, of which 70% is about smelting flux, and the rest is non-smelting flux. The industrialized developed countries in Europe and the United States are mainly non-smelting fluxes, which are about 80% and 90% or more. However, there are still smelting fluxes produced and sold. The lasting productivity of smelting fluxes is related to some inherent characteristics.

Our company also has JCOE STEEL PIPE on sale, welcome to consult.


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