Spiral steel pipe is a kind of steel commonly used in industry, construction and other industries. It is a spiral seam steel pipe made of strip steel coil as raw material, often warmly extruded, and welded by automatic double-wire double-sided submerged arc welding process. Mainly used in water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction.
Spiral steel pipe is used for liquid transportation: water supply and drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structure: for piling pipe, for bridge; for wharf, road, building structure, etc. It plays a great role in conveying gas, transportation.
Spiral seam submerged arc welded steel pipe for pressurized fluid transportation is mainly used for pipelines for transporting oil and natural gas; spiral seam high frequency welded steel pipe for pressurized fluid transportation, welded by high frequency lap welding, is used for pressurized fluid Conveying spiral seam high frequency welded steel pipe. The steel pipe has strong pressure bearing capacity and good plasticity, which is convenient for welding and processing. Generally, the spiral seam submerged arc welded steel pipe for low-pressure fluid transportation is made of double-sided automatic submerged arc welding or single-sided welding for water, gas, air and steam. Submerged arc welded steel pipes for general low-pressure fluid transportation.
Its strength is generally higher than that of straight seam welded pipes. It can produce welded pipes with larger diameters from narrower billets, and can also use billets of the same width to produce welded pipes with different diameters. However, compared with the same length of straight seam pipe, the length of the weld is increased by 30~100%, and the production speed is lower. Therefore, the smaller diameter welded pipes are mostly straight seam welded, and the large diameter welded pipes are mostly spiral welded.
Compared with solid steel such as round steel, steel pipe is lighter in weight when the bending and torsional strength is the same. Making ring parts with steel pipes can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing time, such as rolling bearing rings, jack sets, etc., which have been widely used in steel pipe manufacturing. Steel pipe is also an indispensable material for various conventional weapons. Gun barrels, barrels, etc. must be made of steel pipes. Steel pipes can be divided into round pipes and special-shaped pipes according to the shape of the cross-sectional area. Since the area of the circle is the largest under the condition of equal perimeter, more fluid can be transported with a circular tube. In addition, when the ring section is subjected to internal or external radial pressure, the force is relatively uniform.
Spiral steel pipes are also closely related to our lives. Our drainage, exhaust, gas and gas are inseparable from the help of spiral steel pipes.
