What is the production process of spiral steel pipe

1.Uncoiling plate probe: After uncoiling, the steel plate enters the production line, and the whole plate is first subjected to ultrasonic inspection.

2.Leveling and milling: the original curled steel plate is flattened by the anvil machine, and then the two edges of the steel plate are double-sided milled by the edge milling machine to achieve the required plate width, plate edge parallelism and groove shape.

3.Shear forming: The steel plate is spirally curled into a tube along the outer edge of the production line.

4.Butt welding and cutting: pre-welding, internal welding, and external welding are carried out by advanced double-sided submerged arc welding technology. The welded steel pipe is cut to the standard length using a plasma ruler.

5.Visual inspection: Some basic parameters are checked by professional technicians.

6.Ultrasonic flaw detection: 100% inspection of the internal and external welds and the base metal on both sides of the weld.

7.X-ray flaw detection: 100% X-ray industrial television inspection is carried out on internal and external welds, and image processing system is used to ensure the sensitivity of flaw detection.

8.Pressure test: The steel pipe is inspected one by one on the hydraulic testing machine to ensure that the steel pipe meets the test pressure required by the standard.

9.Chamfering flat head: The steel pipe after passing the inspection is processed at the end of the pipe to achieve the required groove size of the pipe end.

10.Final inspection: Ultrasonic and X-ray flaw detection and magnetic particle inspection of the pipe end are performed again to check for welding problems and pipe end defects.

11.Oiled marking: The qualified steel pipe is oiled to prevent corrosion, and marked according to the user's requirements.

In addition to the above testing items, according to API standards and other relevant standards and the special requirements of some users, it is also necessary to carry out destructive inspection and other inspections on steel plates and steel pipes, including sampling inspection of physical and chemical properties of incoming raw materials and 100% visual inspection of steel plates.

1. The raw materials of spiral steel pipe are strip coil, welding wire and flux. 2. Before forming, the strip steel is leveled, trimmed, planed, and the surface is cleaned and conveyed and bent. 3. The weld gap control device is used to ensure that the weld gap meets the welding requirements, and the pipe diameter, misalignment amount and weld gap are strictly controlled.

4. After cutting into a single steel pipe, three steel pipe heads of each batch should be subject to a strict first inspection system to check the mechanical properties, chemical composition, fusion status, surface quality of the steel pipe and non-destructive testing to ensure that the pipe making process is qualified before it can be officially put into production.

Overview of the two process flows of seamless steel pipes.

Hot Rolling (Extruded Seamless Steel Pipe): Round Tube Blank Heating Perforation Three-high skew rolling, continuous rolling or extrusion Tube removal Sizing (or reducing diameter) Cooling Billet Straightening Hydrostatic test (or flaw detection) Marking Warehousing.

Cold-drawn (rolled) seamless steel pipe: round tube blank heating, perforation, heading, annealing, pickling, oiling (copper plating), multi-pass cold drawing (cold rolling), billet tube, heat treatment, straightening, hydrostatic test (flaw detection), marking, warehousing.

2. Spiral steel pipe manufacturing process.

Raw material inspection, feeding, uncoiling, roll leveling, steel strip inspection, cutting head, steel strip butt welding, disc cutting edge, edge welding preparation, roll sleeve forming, internal welding, external welding, welding skin cleaning, internal and external weld TV appearance inspection, ultrasonic continuous inspection, repair, X-ray continuous inspection and filming, manual ultrasonic review, cutting off, nozzle chamfering, hydrostatic test, final appearance inspection, non-destructive inspection, user inspection, weighing, steel pipe stacking.

The spiral steel pipe feeds the strip steel into the welded pipe unit, and after rolling through multiple rolls, the strip steel is gradually rolled up to form a round pipe blank with an open gap, and the amount of pressure of the extrusion roller is adjusted to control the weld gap at 1 3mm, and the two ends of the weld are flush.

Main process features:

a.During the forming process, the steel plate is uniformly deformed, the residual stress is small, and the surface is not scratched. The processed spiral steel pipe has greater flexibility in the size and specification range of diameter and wall thickness, especially in the production of high-grade thick-walled pipes, especially small- and medium-diameter thick-walled pipes, which can meet the incomparable advantages of other processes, which can meet more requirements of users in terms of spiral steel pipe specifications.

b.The advanced double-sided submerged arc welding process can be welded in the best position, and it is not easy to have defects such as misalignment, welding deviation and lack of penetration, and it is easy to control the welding quality.

c.100% quality inspection of steel pipes is carried out, so that the whole process of steel pipe production is under effective testing and monitoring, and the product quality is effectively guaranteed.

d.All the equipment of the whole production line has the function of networking with the computer data acquisition system to realize the real-time transmission of data, and the technical parameters in the production process are controlled by the first control room.

Spiral Hose (MLXG) provides maximum abrasion protection for wires and hoses, as well as protection from UV rays at a wide range of temperatures. The spiral tube can be directly wound around wires and cables with joints. After using spiral pipe, it can prolong the service life of the first object, reduce the cost and facilitate installation.

Fix one end of the spiral tube with a protective strap and then wrap it around in a clockwise direction. It mainly provides wear-resistant and insulation protection for wires and cables, and can play a role in finishing and beautifying.