LIAONING KUNLUN OILFIELD SERVICE CO.,LTD

We are the leading and professional sales and service suppliers and manufacturers in the steel industry.

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LIAONING KUNLUN OILFIELD SERVICE CO.,LTD

What will define our efforts above those of the cooperation will be the quality of product and customer service.

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Liaoning Kunlun Oilfield Service Co., Ltd

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Products

High Quality;Credibility First; Normalized Management; Customer Satisfaction.


SERVICE PHILOSOPHY

Customer Focus, a Satisfactory Standard

Business Philosophy

 Quality first, credibility first.

1

Advance with the times

 Advance with the times; Advance with the market; Advance with the industry.

2

Development Goals

To be a world-renowned supplier and manufacturer of steel and metal products; To provide global customers with quality products and services.

3

Service Philosophy

Respect for the customer, all for the sake of customers.

4

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Specializing in anti-corrosion, insulation engineering construction, anti-corrosion materials business of specialized engineering companies.

2023-08-14

Submerged arc welded straight seam steel pipes for natural gas transmission


Submerged arc welded straight seam steel pipe Description of the main production process of longitudinal welded pipe for building structure: 1. Plate exploration: after the steel plate used to manufacture large-diameter submerged arc welded straight seam steel pipe enters the production line, the whole plate ultrasonic inspection is first carried out; 2. Milling edge: double-sided milling of the two edges of the steel plate through the edge milling machine to achieve the required plate width, plate edge parallelism and groove shape; 3. Pre-bending edge: use the pre-bending machine to pre-bend the board edge, so that the board edge has the curvature that meets the requirements; 4. Forming: On the JCO forming machine, first half of the pre-bent steel plate is stamped in multiple steps and pressed into a "J" shape, and then the other half of the steel plate is also bent and pressed into a "C" shape, * forming an open "O" shape 5. Pre-welding: make the formed straight seam welded steel pipe seam and use gas shielded welding (MAG) for continuous welding; 6. Internal welding: longitudinal multi-filament submerged arc welding (* can be more than four wires) is used to weld the inside of the straight seam steel pipe; 7. External welding: longitudinal multifilament submerged arc welding is used to weld the outside of the straight seam submerged arc welded steel pipe; 8. Ultrasonic inspection: 100% inspection of the inner and outer welds of the straight seam welded steel pipe and the base metal on both sides of the weld; 9. X-ray inspection: 100% X-ray industrial TV inspection of internal and external welds, using image processing system to ensure the sensitivity of flaw detection;

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