Production of API 5L seamless steel pipes involves several critical steps to ensure quality and compliance with standards. Here is an overview of the key processes.
A. Oil Marking: Post water pressure testing, pipes are coated to prevent corrosion and marked per user requirements.
B. Leveling Milling: Steel plates are flattened and milled to achieve the required width, parallelism, and groove shape.
C. Shear Forming: Steel plates are curled into a tube along a spiral on the production line.
D. Butt Welding: Using advanced double-sided submerged arc welding for pre-welding, welding, and external welding, followed by plasma bar cutting to length.
E. Visual Inspection: Basic parameters are checked by professional technicians.
F. Ultrasonic Flaw Detection: 100% inspection of internal and external welds and base metal for scrap steel.
G. X-ray Inspection: 100% industrial television inspection of welds using an image processing system.
H. Pressure Test: Hydraulic testing to ensure pipes meet required pressure standards.
I. Chamfer Flat Head: Post-testing, pipe ends are processed to the required groove size.
J. Final Inspection: Straightening machine conducts ultrasonic and X-ray inspections and magnetic powder tests for welding and pipe-end defects.
K. Uncoiler Plate Exploration: Initial full-plate ultrasonic inspection after the steel plate enters the production line.
These steps ensure that the seamless steel pipes produced are of high quality and meet industry standards.
United Steel Industry As the most important steel pipe manufacturer and exporter in China, in the past 20 years, we have completed more than 100 projects, with partners in more than 100 countries, and established relationships with oil and gas and EPC companies in many countries business relationship.
For more information about the product price, catalog and rolling mill inspection certificate,
please consult:Email:Sales@usisteels.com
