LSAW Steel Pipes

A: Straight seam submerged arc welded steel pipe (LSAW pipe) is a steel pipe manufactured based on the straight seam submerged arc welding process, which has the characteristics of strong pressure bearing capacity and high weld quality.

A: The manufacturing process of straight seam submerged arc welded steel pipe mainly includes plate detection, milling edge, pre-bending edge, forming, pre-welding, internal welding, external welding, ultrasonic inspection, X-ray inspection, diameter expansion, water pressure test, chamfering, re-ultrasonic inspection, re-X-ray inspection, magnetic particle inspection of pipe ends, and anti-corrosion and coating.

A: Straight seam submerged arc welded steel pipe is widely used in many fields such as mechanical processing, construction engineering, automobile manufacturing, petrochemical industry, etc. It can be used to manufacture mechanical structures, pipelines, natural gas pipelines, scaffolding, automobile chassis and automobile exhaust pipes.

A: The specifications of LSAW steel pipes are wide, generally ranging from 325mm to 1420mm. When the diameter is greater than 914.4mm, the standard allows the steel pipe to have two straight welds.

A: The weld quality of LSAW steel pipes is guaranteed by strict welding process and subsequent testing. Longitudinal multi-wire submerged arc welding is used during welding to ensure the fusion and strength of the weld. Subsequently, non-destructive testing technologies such as ultrasonic testing and X-ray inspection are used to comprehensively test the inside and surface of the weld to ensure the quality of the weld.

A: There are significant differences between LSAW steel pipes and high-frequency LSAW steel pipes in terms of raw materials, forming process, welding process, etc. The straight seam submerged arc welded steel pipe is made of medium and thick plates, formed by JCOE cold stamping, and welded by submerged arc welding process; while the high-frequency straight seam steel pipe is made of strip steel, formed by cold rolling forming process, and welded by high-frequency welding process.

A: The straight seam submerged arc welded steel pipe has excellent pressure bearing capacity, which is due to its high-quality welds and solid pipe body structure. In the fields of mechanical processing, construction engineering, etc., the straight seam submerged arc welded steel pipe can withstand greater pressure and load.

A: The weld appearance of the straight seam submerged arc welded steel pipe should be flat and smooth, and there should be no defects such as cracks, pores, slag inclusions, etc. The weld height and width should meet the requirements of the drawings, and the radial misalignment (misalignment) of the edges of the steel strips or plates on both sides of the weld should be within the specified range.

A: The internal quality inspection of LSAW steel pipe mainly adopts non-destructive testing technology, such as ultrasonic testing (UT), radiographic testing (RT) and penetration testing (PT). These technologies can detect whether there are defects such as cracks, lack of fusion, and lack of penetration inside the weld, and locate the position and size of the defects.

A: LSAW steel pipes are made of various materials, mainly including low carbon steel and low alloy steel or other steels with σs≤300N/mm², σs≤500N/mm². The specific material selection depends on the use environment and requirements.

A: The production cost of LSAW steel pipe is affected by many factors, including raw material prices, production process complexity, equipment investment, etc. Compared with high-frequency LSAW steel pipes, the production cost of LSAW steel pipes may be slightly higher, but its superior performance and wide application areas make it have a higher market value.

A: The corrosion resistance of LSAW steel pipe depends on its material and coating. The use of suitable materials and coatings can significantly improve the corrosion resistance of LSAW steel pipe and extend its service life.

A: Yes, LSAW steel pipe can be subjected to quenching and tempering heat treatment. This heat treatment can improve the hardness and strength of the steel pipe and improve its mechanical properties.

A: The hardness test of LSAW steel pipe is usually carried out by Vickers hardness tester, Rockwell hardness tester or surface Rockwell hardness tester. The test should be carried out in the designated area to ensure the accuracy of the test results.

A: The weld of LSAW steel pipe can be polished according to customer requirements before leaving the factory. The surface of the weld after polishing should be flat and smooth without obvious defects and marks.

A: The production cycle of LSAW steel pipe depends on many factors, including production scale, production process complexity, equipment performance, etc. Generally speaking, the production cycle is between a few days and a few weeks.

A: Yes, LSAW steel pipe can be customized according to the specific requirements of customers. This includes customization in specifications, materials, coatings, etc.

A: When transporting and storing LSAW steel pipe, care should be taken to avoid collision and extrusion to prevent deformation and damage of steel pipe. At the same time, the steel pipe should be kept dry and clean to avoid moisture and corrosion.

A: As a high-performance steel pipe product, LSAW steel pipe has broad application prospects in mechanical processing, construction engineering, automobile manufacturing, petrochemical and other fields. With the continuous development of these fields, the market demand for LSAW steel pipes will continue to grow.

A: When choosing a high-quality LSAW steel pipe supplier, you should consider factors such as its production scale, production process, product quality, price, and after-sales service. At the same time, you should check its relevant qualifications and certifications to ensure the legality and reliability of its products.