Year1
- 规格：
- 219-3500mm
- 规格：
- 6-28
Large-diameter spiral steel pipe is a general term that generally refers to spiral steel pipes with a diameter greater than one meter. Spiral steel pipes are made of steel strips that are bent and then welded. Steel pipes need to undergo hydraulic pressure, bending, flattening and other experiments, which have certain requirements for surface quality. Usually the delivery length is meters and often requires fixed-length delivery. The specifications of spiral steel pipes are expressed in nominal diameter (mm). The nominal diameter is different from the actual diameter. According to the specified wall thickness, there are two types: ordinary steel pipes and thickened steel pipes.
Spiral seam submerged arc welded steel pipe is made by bending the strip in a spiral shape and using submerged arc automatic welding to weld the inner seam and outer seam to make a spiral seam steel pipe. It can be widely used in the production of large-diameter steel pipes for the following reasons:
) Steel pipes of various diameters can be produced from strip steel of the same width by changing the forming angle
) Because it is continuously bent and formed, The fixed length of the steel pipe is not limited
) The welds are spirally distributed evenly on the entire circumference of the steel pipe, so the steel pipe has high dimensional accuracy and high strength
Types of welds for large diameter spiral steel pipes
Butt weld: It is a circular weld formed by joining two steel pipes together.
Steel strip butt welding seam: It is the welding seam where the steel plate or steel strip on the spiral seam steel pipe is connected head to tail.
Tack weld: It is a weld used to fix the butt edges before final welding.
Surface requirements for large diameter spiral steel pipe welds
The appearance of large diameter spiral steel pipe welds should be uniform, regular, and gentle in transition. The surface of the weld should not have defects such as arc breaks, burn-throughs, cracks, scars, folds, and arc craters. .
Spiral pipes and their standard classifications: Spiral seam submerged arc welded steel pipes for pressure-bearing fluid transportation (-) are mainly used in pipelines for transporting oil and natural gas. Spiral seam high-frequency welded steel pipes for pressure-bearing fluid transportation (-) are used for high-pressure fluid transportation. Spiral seam high-frequency welded steel pipes used for pressure fluid transportation welded by frequency lap welding method. The steel pipe has strong pressure-bearing capacity and good plasticity, which is convenient for welding and processing. It is a spiral submerged arc welded steel pipe for general low-pressure fluid transportation (-). It is made by double-sided automatic submerged arc welding or single-sided welding. It is used for water, gas, air and steam, etc. Submerged arc welded steel pipes for general low-pressure fluid transportation
Nowadays, the commonly used standards for spiral steel pipes are generally divided into: /- (Ministry standard, also called
Spiral seam submerged arc welded steel pipes for ordinary fluid transportation pipelines),.- (National standard, also called oil and gas industry transportation steel pipe delivery technical conditions Part 1: Graded steel pipes (graded steel pipes with strict requirements so far)), - (American Petroleum Institute, also called pipeline steel pipes, which are divided into two types: level),/- (spiral submerged arc welded steel pipe for piles)
Spiral pipe material:,,,,.
We adhere to the tenet of quality as survival and customer as standard to provide all-round and comprehensive Process of serving customers. Customers are welcome to call us to discuss business.
Yu Xin
WhatsApp
