Large-Diameter Industrial Pipe Production Process

Large-diameter stainless steel pipe is commonly produced from plate when the required dimensions are outside the practical range of continuous coil-forming lines. The manufacturing plan is defined by the material grade, outside diameter, wall thickness, applicable standard, welding procedure, and inspection requirements.

Typical Plate-Formed Welded Pipe Process

1. Material review: Verify plate identification, dimensions, surface condition, and required material documentation.
2. Cutting and edge preparation: Cut the plate to the calculated width and prepare edges for the specified weld joint.
3. Forming: Roll or form the plate to the required diameter while monitoring roundness and alignment.
4. Fit-up and welding: Align the longitudinal seam and weld it using the qualified procedure specified for the order.
5. Weld inspection: Perform visual and applicable nondestructive examination according to the product standard and purchase specification.
6. Heat or surface treatment: Apply solution heat treatment, pickling, passivation, grinding, or polishing only when required by the material, standard, or order.
7. Dimensional and pressure testing: Check diameter, wall thickness, length, straightness, ends, and any specified hydrostatic or leak test.
8. Final documentation and packing: Complete marking, inspection records, material documentation, and agreed packaging.

The exact sequence may vary with pipe dimensions, material grade, construction method, and acceptance criteria. Review related industrial stainless steel pipe specifications and our quality testing page, or send your project requirements.