With the continuous development of our country's economy and the vigorous development of the national energy industry, long-distance oil and gas pipelines are an important way to achieve energy security.

In the production of high-frequency welded pipes, the formation of the pipe blank and the state of the seam directly affect the quality of the weld, and the parallelism of the weld butt surfaces is particularly important. During the joint welding process of steel pipes, the parallelism of the joints is mainly ensured by adjusting the reduction of the upper roller of the extrusion roller and the gap between the two upper rollers.

Straight seam steel pipe is a type of welded steel pipe that is widely used in daily life. I believe many people who are in contact with pipeline engineering have heard of straight seam steel pipes. But do you all know the differences between different specifications of straight seam steel pipes? let's see!

In the general quality standards for welded structures, there is no clear limit on surface pitting of welds and is not used as a basis for product acceptance.

The submerged arc welded straight seam steel pipe body has a longitudinal weld. When the diameter is greater than 914mm, two weldings are allowed. Welding wire is used for submerged arc welding.

lsaw pipes is between 89~1600mm, and can even be larger under special circumstances. The ratio of wall thickness to pipe diameter is about 0.06~0.08. Foreign modern pipe making technology can produce welded pipes with wall thicknesses up to 100mm.

SSAW Pipes should undergo mechanical performance tests, flattening tests and expansion tests before leaving the factory, and must meet standard requirements.

LSAW pipes is a welded steel pipe that is transformed into a cylindrical shape after being passed through a forming machine to form a hot-rolled steel coil.

Straight seam steel pipe refers to a steel pipe in which the welding seam is parallel to the length direction of the steel pipe. Usually divided into metric electric welded steel pipes, electric welded thin-walled pipes, transformer cooling oil pipes, etc.

Straight seam high-frequency welded steel pipe has the characteristics of relatively simple process and fast continuous production. It has a wide range of uses in civil construction, petrochemical, light industry and other fields.