Stainless steel rectangular pipe is a kind of hollow long steel, which is widely used as pipeline for transporting fluids, such as oil, natural gas, water, gas, steam, etc. In addition, when the bending and torsional strengths are the same, the weight is lighter.Therefore, it is also widely used in the manufacture of mechanical parts and engineering structures. It is also commonly used to produce various conventional weapons, barrels, shells, etc.

Seamless pipe is the most used pipe fitting in oil and gas engineering pipelines and construction engineering pipelines. The pressure rating design of seamless pipe is introduced below. The pressure rating of seamless pipe includes two parts: the nominal pressure rating of standard pipe fittings expressed in nominal pressure. ;Wall thickness class of standard fittings expressed in wall thickness class

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.