SSAW Tube and LSAW Tube are carbon steel tubes using submerged arc welding technology. Submerged arc welding is a welding method in which the arc burns under the flux layer. Its inherent advantages of stable welding quality, high welding productivity, no arc and little smoke make it the main welding method in the production of important steel structures such as pressure vessels, pipe sections, box beams and columns.

The main factors affecting the cracking of seamless steel pipes include the defect of the original material and the influence of metallographic structure on the cracking of seamless steel pipes

Seamless pipe means a pipe with a hollow section and no joints in the middle, which is widely used in various industries such as petrochemical industry. In the process of manufacturing seamless pipes, it is generally necessary to cut the seamless pipes to a specified size. Under the existing technical conditions, the cutting of seamless pipes generally uses a sawing machine or flame cutting.

ASTM A500 is a standard specification for seamless and weldable carbon structural steel published by ASTM International. ASTM A500 rectangular pipe is a rectangular steel pipe that can be welded, riveted, or bolted for use in bridges or buildings and general structures.

ASTM A500 square tube is a cold worked seamless and welded special section carbon structural steel pipe.

At present, ASTM A500 square pipes are all rolled from billets, and the main rolling methods are cold rolling and hot rolling, which will affect the structure and properties of ASTM A500 square pipes to varying degrees.