Advantages And Disadvantages Of Straight Seam Steel Pipe

Straight seam steel pipes may be divided into high frequency straight seam steel pipes (ERW Pipe) and submerged arc welded straight seam steel pipes (LSAW Pipe) based on the manufacturing course of.

Straight seam steel pipe is a steel pipe ( whose weld seam is parallel to the longitudinal route of the steel pipe. The production technique of straight seam steel pipe is easy, with excessive production efficiency, low cost and steel pipe rapid development. The power of spiral welded pipes is generally larger than that of straight seam welded pipes. A narrower blank can be utilized to supply steel pipes with bigger pipe diameters. The identical width of blanks can be used to provide welded pipes with totally different pipe diameters. But in contrast with the straight seam pipe of the same size, the weld length is elevated by 30-100%, and the manufacturing speed is lower.

Straight seam steel pipes could be divided into ERW steel pipe and submerged arc welded straight seam steel pipes (LSAW) in response to the production course of. Submerged arc welded straight seam steel pipes are divided into UOE, RBE, JCOE steel pipes, etc. in accordance with their completely different forming methods.

The length of the straight seam steel pipe is usually 300 mm-1200 mm, and the perforation temperature of the straight seam steel sheet pipe billet varies with different raw materials.

A lot of the heat-expanded straight seam steel pipes are round 1200°C. The higher the carbon content material and other alloying components, the decrease the temperature. The important thing to the heating operation of the straight seam steel pipe is to attenuate the quantity of oxide scale, particularly throughout heat therapy.

In the production process of straight seam steel pipes, alloy sheet since the first processing is carried out underneath heating, the heating operation is an important process for determining the product. Furnaces for heating straight seam steel pipes are divided into heating furnaces and reheating furnaces in line with their effects; the former is used to heat the blank from room temperature to processing temperature;the latter is used to reheat the blank to the required processing temperature throughout processing.

Improper heating of straight seam steel pipes will trigger cracks on the inside or outer floor of the billet.

There are many ways to heat a straight seam steel pipe, however the first one is a suspension furnace. This kind of heating furnace has an annular furnace backside, which could be slowly changed. The billet is loaded from the inlet alongside the diameter of the bottom. When the outlet is used, it can be heated evenly to the traditional temperature. The key to this heating operation is to evenly heat the billet to be appropriate for processing. temperature.

Since perforation has a fantastic affect on perforation, that is to say, the temperature of perforation processing is an important situation, so it is mostly vital to regulate the temperature of the blank during perforation processing.

Disadvantages of sizzling-rolled straight seam steel pipe:

1.Residual stress attributable to uneven cooling. Residual stress is the internal self-balanced stress with out exterior force. Hot-rolled steel sections of various sections have such residual stresses. Generally, the larger the section dimension of the steel section, the bigger the residual stress. Although the residual stress is self-balanced, stainless steel pipe it still has a certain influence on the performance of steel components beneath exterior pressure. For instance, it might have adversarial results on deformation, stability, fatigue resistance, etc.;

2.After welding, the non-metallic inclusions contained in the straight seam steel pipe are pressed into skinny slices, and delamination happens. The delamination vastly deteriorates the tensile properties of the straight seam steel pipe within the thickness route, and it is possible that the interlayer tear happens when the weld shrinks. The native pressure induced by weld shrinkage usually reaches several instances the yield level strain, which is way bigger than the strain attributable to the load.

Advantages of submerged arc welding longitudinal seam steel pipe:

It might destroy the cast construction of the steel ingot, refine the grain of the steel, and get rid of the defects of the microstructure, in order that the steel construction is dense and the mechanical properties are improved. This enchancment is mainly mirrored within the rolling route, so that the straight seam steel pipe is no longer isotropic to a sure extent; the bubbles, cracks and looseness formed throughout casting may also be welded under the motion of excessive temperature and stress.

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