Welded Pipe Straightening Machine

Dec . 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:

🔹Correcting longitudinal and lateral pipe bending
🔹Improving straightness to meet ASTM, API, and other standards
🔹Reducing deformation during cutting, stacking, and transportation
🔹Enhancing surface appearance and dimensional consistency

Working Principle

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

High-precision multi-roller straightening structure
Adjustable roller pressure for different pipe sizes and wall thicknesses
Stable operation for continuous production
Wear-resistant alloy steel rollers with long service life
Easy integration with existing ERW tube mill equipment

Technical Parameters (Reference)

Item	Specification
Pipe Diameter	Φ20 – Φ219 mm
Wall Thickness	0.8 – 8.0 mm
Roller Quantity	5 – 9 rollers
Straightening Type	Vertical / Staggered rollers
Straightness Accuracy	≤ 1/1000 of pipe length
Material	Carbon steel, low-alloy steel
Line Speed	Matches ERW tube mill speed

👉Parameters can be customized according to customer requirements.

Related Equipment

The straightening machine works together with:

⚙️Sizing Mill
⚙️Cooling Bed
⚙️Flying Cut-off Machine
⚙️Pipe Conveyor System
⚙️Automatic Bundling Machine

Industries Served

Construction pipes
Structural steel tubes
Furniture and scaffolding pipes
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

Item	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
Application	Welded pipes	Raw material preparation

Simple Explanation

Leveling machine works on flat steel strip before the pipe is formed
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.

Pervious

Expert Insights on the Tube Mill Process | Industrial Tube Production

Merry Christmas & Happy New Year!

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