Spiral steel pipe is different from seamless steel pipe

　　Seamless steel pipe is a kind of long steel with hollow section and no joints around it. The steel pipe has hollow cross section, which is used as a conduit for conveying fluid, such as pipelines for transporting oil, natural gas, gas, water and some solid materials.

　　The spiral steel pipe (GB/T3092-1993) for low pressure fluid conveying is also called the general spiral steel pipe, commonly known as the black pipe. It is used for conveying water, gas, air, oil and heating steam and other general low pressure fluid and other purposes of spiral steel pipe. The steel pipe wall is thickened into common steel pipe and thickened spiral steel pipe.

　　The specification of the API 5L Thick Wall Large Diameter Spiral Steel Pipe is expressed in nominal diameter (mm), and the nominal diameter is the approximate value of the inner diameter. Often used in inches, such as 11/2. The spiral steel pipe used for low pressure fluid transportation is not only used directly for conveying fluid, but also used as the original pipe of spiral steel pipe for low pressure fluid transportation.

　　The spiral steel pipe (SY5036-83) used for pressurized fluid transportation is used as a tube billet with hot rolled steel strip, which is often spirally formed and welded by double-sided submerged arc welding. It is used for the spiral steel pipe conveyed by the pressure fluid. The steel pipe has strong bearing capacity and good welding performance. It is safe and reliable through all kinds of strict scientific tests and tests. The diameter of the steel pipe is large, the transportation efficiency is high, and investment in laying pipelines is saved. It is mainly used for pipeline transportation of oil and natural gas.