Straight seam steel pipes could be divided into excessive frequency straight seam steel pipes (ERW Pipe) and submerged arc welded straight seam steel pipes (LSAW Pipe) in keeping with the production process.

Straight seam steel pipe is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. The production means of straight seam steel pipe is simple, with excessive production efficiency, low cost and fast development. The strength of spiral welded pipes is mostly greater than that of straight seam welded pipes. A narrower blank can be utilized to supply steel pipes with larger 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 production speed is decrease.

Straight seam steel pipes might be divided into ERW steel pipe and submerged arc welded straight seam steel pipes (LSAW) in accordance with the manufacturing process. Submerged arc welded straight seam steel pipes are divided into UOE, RBE, JCOE steel pipes, and so forth. in accordance with their completely different forming strategies.

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

Most of the heat-expanded straight seam steel pipes are round 1200°C. The higher the carbon content material and different alloying elements, the decrease the temperature. The key to the heating operation of the straight seam steel pipe is to minimize the amount of oxide scale, particularly during heat treatment.

Within the manufacturing strategy of straight seam steel pipes, since the first processing is performed beneath heating, the heating operation is an important process for determining the product. When you have any kind of concerns concerning in which along with the way to use Structural steel (, it is possible to contact us at our own webpage. Furnaces for heating straight seam steel pipes are divided into heating furnaces and reheating furnaces in accordance 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 necessary processing temperature during processing.

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

There are some ways to heat a straight seam steel pipe, but the first one is a suspension furnace. This kind of heating furnace has an annular furnace bottom, which will 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 normal temperature. The important thing to this heating operation is to evenly heat the billet to be appropriate for mold seamless steel tube processing. temperature.

Since perforation has an important influence on perforation, that is to say, the temperature of perforation processing is an important situation, so it is usually obligatory to control the temperature of the blank throughout perforation processing.

Disadvantages of sizzling-rolled straight seam steel pipe:

1.Residual stress brought on by uneven cooling. Residual stress is the inner self-balanced stress with out exterior force. Hot-rolled steel sections of various sections have such residual stresses. Generally, the larger the part measurement of the steel part, the bigger the residual stress. Although the residual stress is self-balanced, it still has a sure influence on the performance of steel parts under external pressure. For instance, it could have adverse results on deformation, stability, fatigue resistance, and so on.;

2.After welding, the non-metallic inclusions inside the straight seam steel pipe are pressed into thin slices, and delamination occurs. The delamination vastly deteriorates the tensile properties of the straight seam steel pipe in the thickness direction, and it is possible that the interlayer tear happens when the weld shrinks. The local pressure induced by weld shrinkage often reaches several times the yield point pressure, which is way larger than the pressure brought on by the load.

Advantages of submerged arc welding longitudinal seam steel pipe:

It could possibly destroy the solid structure 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 improvement is mainly mirrored in the rolling route, in order that the straight seam steel pipe is not isotropic to a sure extent; the bubbles, cracks and looseness formed throughout casting may also be welded underneath the action of excessive temperature and strain.