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Welded Pipe Straightening Machine
Дек . 29, 2025 00:00
Steel Pipe Straightener for Welded Pipe Production Line
Product Overview
The Straightening Machine is a key finishing unit in an ERW tube mill, designed to eliminate bending, camber, and residual stress in welded steel pipes.
After welding, sizing, and cooling, steel pipes may still have slight deformation. The straightening machine ensures excellent straightness and roundness before cutting and packaging, improving final product quality and customer acceptance.
Application in ERW Tube Mill
In an ERW welded pipe production line, the straightening machine is typically installed:
After the Sizing Mill and before the Flying Cut-off
Its main functions include:
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🔹Correcting longitudinal and lateral pipe bending
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🔹Improving straightness to meet ASTM, API, and other standards
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🔹Reducing deformation during cutting, stacking, and transportation
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🔹Enhancing surface appearance and dimensional consistency
Принцип работы
The machine uses multiple straightening rollers arranged vertically or in a staggered layout.
As the pipe passes through the rollers, controlled pressure is applied repeatedly to release internal stress and correct deformation.
This continuous straightening process does not interrupt production speed and is suitable for high-efficiency ERW tube mills.
Main Features
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High-precision multi-roller straightening structure
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Adjustable roller pressure for different pipe sizes and wall thicknesses
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Stable operation for continuous production
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Wear-resistant alloy steel rollers with long service life
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Easy integration with existing ERW tube mill equipment
Technical Parameters (Reference)
| Элемент | Спецификация |
|---|---|
| Диаметр трубы | Φ20 – Φ219 mm |
| Толщина стенки | 0.8 – 8.0 mm |
| Roller Quantity | 5 – 9 rollers |
| Straightening Type | Vertical / Staggered rollers |
| Straightness Accuracy | ≤ 1/1000 of pipe length |
| Материал | Carbon steel, low-alloy steel |
| Линейная скорость | Matches ERW tube mill speed |
👉Parameters can be customized according to customer requirements.
Related Equipment
The straightening machine works together with:
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⚙️Sizing Mill
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⚙️Cooling Bed
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⚙️Flying Cut-off Machine
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⚙️Pipe Conveyor System
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⚙️Automatic Bundling Machine
Industries Served
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Construction pipes
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Structural steel tubes
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Furniture and scaffolding pipes
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ERW pipes for oil & gas applications
Straightening Machine vs Leveling Machine
What Is the Difference in an ERW Tube Mill?
Many customers confuse straightening machines with leveling machines. Although both use rollers to correct deformation, they are designed for different materials and different positions in an ERW tube mill.
Key Differences at a Glance
| Элемент | Straightening Machine | Leveling Machine |
|---|---|---|
| Process Material | Finished steel pipe | Steel strip / coil |
| Main Purpose | Correct pipe bending | Improve strip flatness |
| Position in ERW Tube Mill | After sizing mill | Entry section |
| Process Stage | After forming & welding | Before forming |
| Приложение | Welded pipes | Raw material preparation |
Simple Explanation
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Правильная машина works on flat steel strip before the pipe is formed
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Straightening machine works on finished steel pipe after welding and sizing
👉 They serve different purposes and cannot replace each other in an ERW tube mill.
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