China High quality 316 seamless tubing Manufacturer – LSAW Carbon Steel Pipe Welded Steel Pipe – Future Metal

Description of the main production process of large-diameter straight seam welded pipe:

1. Plate inspection: After the steel plate used to manufacture the large-diameter submerged arc welded straight seam steel pipe enters the production line, the full plate ultrasonic inspection is first carried out;

2. Edge milling: double-sided milling of the two edges of the steel plate by a milling machine to achieve the required plate width, plate edge parallelism and bevel shape;

3. Pre-bending: Use a pre-bending machine to pre-bend the edge of the board so that the edge of the board has a curvature that meets the requirements;

4. Forming: On the JCO forming machine, first half of the pre-bent steel plate is pressed into a “J” shape through multiple stepping steps, and then the other half of the steel plate is also bent and pressed into a “C” shape, and finally an opening is formed “O” shape

5. Pre-welding: Join the formed longitudinally welded steel pipes and use gas shielded welding (MAG) for continuous welding;

6. Internal welding: use longitudinal multi-wire submerged arc welding (up to four wires) to weld on the inner side of the straight seam steel pipe;

7. External welding: use longitudinal multi-wire submerged arc welding to weld on the outside of the longitudinal submerged arc welded steel pipe;

8. Ultrasonic inspection I: 100% inspection of the inner and outer welds of the longitudinally welded steel pipe and the base materials on both sides of the weld;

9. X-ray inspection I: 100% X-ray industrial television inspection of the inner and outer welds, using an image processing system to ensure the sensitivity of flaw detection;

10. Diameter expansion: expand the total length of the submerged arc welded straight seam steel pipe to improve the dimensional accuracy of the steel pipe and improve the distribution of the internal stress of the steel pipe;

11. Hydraulic test: The expanded steel pipes are inspected one by one on the hydraulic testing machine to ensure that the steel pipe meets the test pressure required by the standard. The machine has automatic recording and storage functions;

12. Chamfering: Process the pipe end of the qualified steel pipe to meet the required pipe end groove size;

13. Ultrasonic inspection Ⅱ: Perform ultrasonic inspection again one by one to check the possible defects of the longitudinally welded steel pipe after the diameter expansion and water pressure;

14. X-ray inspection Ⅱ: X-ray industrial television inspection and filming of pipe end welds on the steel pipe after the expansion and hydraulic test;

15. Tube end magnetic particle inspection: carry out this inspection to find tube end defects;

16. Anti-corrosion and coating: Qualified steel pipes are anti-corrosion and coating according to user requirements.

Strength certified welded pipe supplier

UOE LSAW Pipes

JCOE LSAW Pipes

Tolerance of Outside Diameter and Wall Thickness

Advantages of Future Metal

As a leading steel pipe/tube (carbon steel tube, stainless steel pipe, seamless pipe,welded pipe, precision tube,etc) manufacturer in China, we have a complete production line and a stable supply capacity. Choosing us will allow you to save more time and cost and get the maximum benefit ! 

If you are interested in our products, we can send free samples to you, and we can also accept the testing of third-party testing institutions. We pay attention to the reliability of product quality and the authenticity of test results and put customer interests first, so as to create a pleasant and win-win purchasing and trading experience for customers！

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China Professional Welded Pipe/Tube Manufacturer Wholesale Price

    Our factory has more than 30 years of production and export experience, exporting to more than 50 countries and regions, such as the United States, Canada, Brazil, Chile, the Netherlands, Tunisia, Kenya, Turkey, the United Arab Emirates, Vietnam and other countries. With a fixed production capacity value every month, it can meet the large-scale production orders of customers. Now there are hundreds of customers with fixed large-scale annual orders. If you want to buy welded pipe/tube，square hollow sections pipe/tube,rectangular hollow sections pipe/tube, low carbon steel pipe, high carbon steel tube ,rectangular pipe, carton steel rectangular pipe,square tube, alloy steel pipe, seamless steel pipe, carbon steel seamless tube,steel coils, steel sheets ,precision steel tube,and other steel products, contact us to provide you with The most professional service, save your time and cost !

    Our factory also sincerely invites regional agents in various countries. There are more than 60 exclusive steel plate, steel coil and steel pipe agents. If you are a foreign trading company and are looking for the top suppliers of steel plates, steel pipes and steel coils in China, please contact us. To provide you with the most professional and high-quality products in China to make your business better and better !

   Our factory has the most complete steel product production line and the strictest product testing process to ensure a 100% product pass rate; the most complete logistics delivery system, with its own freight forwarder, saves you more transportation costs and guarantees 100% of the goods. perfect packaging and arrival. If you are looking for the best quality steel sheet, steel coil, steel pipe manufacturer in China, and want to save more logistics freight, please contact us, our professional multilingual sales team and logistics transportation team will provide you with the best Steel product service to ensure you receive a 100% quality guaranteed product !

   Get the best quotation for steel tubes: you can send us your specific requirements and our multilingual sales team will provide you with the best quotation!  Let our cooperation start from this order and make your business more prosperous !