Q235B Longitudinally Welded Pipe
Q235B Longitudinal Seam Welded Pipe Product Introduction
Straight seam welded pipe refers to pipes made from steel strips. Pipes welded using high-frequency welding equipment are called straight seam welded pipes. Longitudinal seam welded pipes made from Q235B steel coils are called Q235 longitudinal seam welded pipes (the name comes from the straight seam welded part of the pipe). Downstream manufacturing processes vary depending on the application field. (They can be roughly divided into scaffolding pipes, fluid pipes, wire rope conduits, support pipes, guardrail pipes, etc.)
Manufacturing process of Q235B longitudinal seam welded pipe
| Core Phase | Process Step | Key Process Diagram |
|---|---|---|
| I. Raw Material Preparation | Steel Plate Pre-treatment | [Steel Plate] → (Ultrasonic Inspection) → (Edge Milling) |
| II. Forming & Closing | JCOE/UOE Forming | (Edge Pre-bending) → [J/C/O or U/O Forming] → [○] (Open Pipe Shell) |
| III. Core Welding | Internal & External Submerged Arc Welding | [○] (Open Pipe Shell) → (Internal Welding) + (External Welding) → [●] (Closed Pipe Shell) |
| IV. Sizing & Finishing | Mechanical Expanding | [●] (Post-Weld Pipe Body) → (Expanding Head) → [◎] (Finished Pipe Body) |
| V. Finishing & Inspection | Cutting & Testing | [◎] → (Cut-to-Length) → (Hydrostatic Test) → (NDT) → (Marking/Painting) |
Common defects encountered during the production of longitudinal seam welded pipes include: serrated edges, wavy bends, indentations, scars, scratches, uneven end faces, and camber.
Improper production operations can lead to various problems. Therefore, it is essential to strictly follow the production procedures to ensure the quality of longitudinally welded steel pipes.
About our company
GNEE STEEL Group's main mission is to "provide customers with high-quality steel products." From procurement to testing and logistics, we will safeguard your needs and ensure that the quality of our products is guaranteed. If needed, we will also take customers on a tour of the steel mill to give them peace of mind.
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