Year1
- 材质：
- Q235B
- 规格：
- 219*6,720*8,820*8,325*10,920*8,1620*10,1620*16,2020*16,1820*12
- 质量等级：
- 正品（受质量异议）
High pressure bearing capacity, low resistance, low temperature resistance
Oil and gas, slurry transportation, urban construction
The process flow first conducts full-plate ultrasonic inspection
Technical features
Steel pipe forming During the process, the steel plate deforms evenly, with small residual stress and no scratches on the surface. The processed steel pipe has greater flexibility in the diameter and wall thickness of the steel pipe size range, especially in the production of high-grade thick-walled steel pipes, especially large-diameter thick-walled pipes. It has advantages that other processes cannot match, and can meet the needs of Users have more requirements for steel pipe specifications
Ⅱ. Using the process of pre-welding first and then internal and external welding (precision welding), welding can be achieved at the best position, and defects such as misalignment, welding deviation and incomplete welding are less likely to occur. , easy to control the welding quality
Ⅲ. Carrying out overall mechanical diameter expansion can effectively improve the dimensional accuracy of the steel pipe and improve the distribution of stress within the steel pipe, thereby avoiding damage caused by stress corrosion and at the same time conducive to on-site welding Construction
Ⅳ. Carry out % quality inspection on steel pipes, so that the entire process of steel pipe production is under effective detection and monitoring, effectively ensuring the quality of submerged arc welded steel pipe products
Ⅴ. Entire pipe All equipment in the production line has the function of networking with the computer data collection system to realize real-time transmission of data. The central control room collects technical parameters and quality indicators in the production process. Quality
Technical Index
Double-sided submerged arc Fatigue index of welded spiral steel pipe
The phenomenon that fatigue metal materials, below their ultimate strength, are subjected to alternating loads (i.e. loads that repeatedly change in magnitude and direction) for a long time, suddenly break without significant plastic deformation. called fatigue. Fatigue index includes fatigue limit and fatigue strength.
Fatigue limit: The maximum stress that a metal material can withstand without breaking after several stress cycles under repeated or alternating stress is called fatigue limit
Fatigue strength: The fatigue strength of a metal material under repeated or alternating stress Under the action of variable stress, the maximum stress that a material can withstand when it breaks after several cycles is called fatigue strength. At this time, it is called the fatigue life of the material. Some metal materials have no obvious fatigue limit under repeated or alternating stress, and are often expressed as fatigue strength.
Process flow
After the steel plate enters the production line, the entire plate is first subjected to ultrasonic inspection
Edge milling uses an edge milling machine to perform double-sided milling on both edges of the steel plate to achieve the required plate width and edge. Parallelism and groove shape
Pre-bending the edge uses a pre-bending machine to pre-bend the edge of the plate so that the edge of the plate has a required curvature
On the forming machine, half of the pre-bent steel plate is first passed through the Step by step stamping, press forming, and then the other half of the steel plate is also bent and pressed to form, and finally the shape of the opening is formed
Pre-welding makes the formed steel pipes join together and is continuously welded using gas shielded welding
The welding uses longitudinal multi-wire submerged arc welding (can be up to four wires) on the inside of the straight seam steel pipe
The external welding uses tandem multi-wire submerged arc welding on the outside of the spiral submerged arc welded steel pipe
Ultrasonic inspection Ⅰ conducts % inspection of the internal and external welds of the spiral steel pipe and the base metal on both sides of the weld
Radiographic inspection Ⅰ conducts % radiographic industrial television inspection of the internal and external welds, using an image processing system to ensure the sensitivity of flaw detection< br/> The entire length of the expanded straight seam steel pipe is expanded to improve the dimensional accuracy of the steel pipe and improve the distribution of stress within the steel pipe
Hydrostatic test: The expanded steel pipe is inspected one by one on a hydraulic testing machine to To ensure that the steel pipe reaches the test pressure required by the standard, the machine has automatic recording and storage functions
Chamfering will process the pipe end of the steel pipe that has passed the inspection to achieve the required pipe end bevel size
Ultrasonic inspection II again Conduct ultrasonic inspection one by one to check possible defects of straight seam welded steel pipes after diameter expansion and hydraulic pressure.
Pipe end magnetic particle inspection conducts this inspection to find pipe end defects
After passing the anti-corrosion and coating standards, the steel pipes will be anti-corrosion and coated according to user requirements.
In addition to the above inspection items, according to standards and other relevant standards and the special requirements of some users, it is also necessary to conduct destructive inspections and other inspections on steel plates and steel pipes, including random inspections of the physical and chemical properties of raw materials entering the factory. % of steel plates Visual inspection.
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