Year1
- 规格：
- DN700
- 标准：
- SY5037
The commonly used standards for spiral pipes are generally / (Ministry standard, also called Spiral submerged arc welded steel pipe for ordinary fluid transportation pipelines), / (National standard, also called the technical delivery conditions part of oil and gas industry transportation steel pipes Grade steel pipes (graded steel pipes with strict requirements so far)), (American Petroleum Institute, also called pipeline steel pipes, which are divided into two grades), / (spiral seam submerged arc welded steel pipes for piles).
Manufacturing process Spiral steel pipe is a spiral seam steel pipe that is made of strip steel coils as raw materials, often warm extrusion molding, and welded by automatic double-wire double-sided submerged arc welding process
The raw material is strip steel coils , welding wire, flux. They must undergo strict physical and chemical inspections before being put into use.
The steel strips are butted head to tail using single or double wire submerged arc welding. After being rolled into steel pipes, automatic submerged arc welding is used for repair welding.
Before forming, the strip steel is leveled, trimmed, planed, surface cleaned, transported and pre-bent.
Electric contact pressure gauges are used to control the pressure of the cylinders on both sides of the conveyor, ensuring smooth conveying of the strip.
Adopt external control or internal control roller forming. Beijing spiral steel pipe/spiral steel pipe factory/spiral steel pipe price
The weld gap control device is used to ensure that the weld gap meets the welding requirements. The pipe diameter, offset amount and weld gap are all strictly controlled.
Both internal and external welding use American Lincoln electric welding machines for single-wire or double-wire submerged arc welding to obtain stable welding specifications.
The completed welds have been inspected by an online continuous ultrasonic automatic flaw detector, ensuring 100% non-destructive testing coverage of spiral welds.
Use an air plasma cutting machine to cut the steel pipe into individual pieces.
() After being cut into individual steel pipes, each batch of steel pipes must undergo a strict first inspection system to check the mechanical properties, chemical composition, fusion status of the welds, the surface quality of the steel pipes, and non-destructive testing to ensure that the production Only after the pipe process is qualified can it be officially put into production.
The areas on the welds with continuous sonic flaw detection marks will undergo manual ultrasonic and radiographic re-examination. If there are indeed defects, they will be repaired and then undergo non-destructive inspection again until it is confirmed that the defects have been eliminated.
The steel strip butt welds and the pipes where the T-shaped joints intersect with the spiral welds are all inspected by radiography or radiographs.
Each steel pipe has been tested by hydrostatic pressure, and the pressure is radially sealed. The test pressure and time are strictly controlled by the steel pipe water pressure microcomputer detection device. Test parameters are automatically printed and recorded.
The pipe end is machined to accurately control the end face verticality, bevel angle and blunt edge. Spiral pipes and their specification classification Spiral seam submerged arc welded steel pipes for transporting pressurized fluids () are mainly used for transporting oil and natural gas pipelines. Spiral seam high-frequency welded steel pipes for transporting pressurized fluids () are used for high-frequency lap welding. Welded, spiral seam high-frequency welded steel pipe used for pressure fluid transportation. The steel pipe has strong pressure-bearing capacity, good plasticity, and is easy to weld and process. 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 and is used for water, gas, air and Submerged arc welded steel pipes for conveying common low-pressure fluids such as steam.
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