12inch 325mm ERW Tube Mill

The 12-inch ERW tube mill is an automated high-frequency welding system designed for the production of large-diameter round and shaped steel tubes (such as square and rectangular). This production line is suitable for continuous forming and welding of carbon steel and low-alloy steel strips. It is widely used in oil and gas pipelines, structural tubing, pressure pipelines, bridge foundation piling, and other applications, meeting the global demand for high-quality, medium-thick wall welded pipes.

Product Details

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Product Details

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Product Description
 
  • Wide Size Range: Capable of producing ERW pipes with diameters from Φ114mm to Φ325mm, covering most large-size industrial demands.

  • Strong Welding Capacity: Equipped with high-power HF induction welding machines, stable for thick-wall materials.

  • Flexible Roll Tooling System: Quick mold change design reduces downtime and supports various pipe sizes.

  • Fully Automated Control: Centralized PLC control with HMI touch screen, easy to operate and adjust.

  • Modular Design: Easy for installation, maintenance, future upgrades, and remote support.

 

List of Equipment Supply
 

No.

Equipment Name

Function Description

1

Hydraulic Coil Car + Double-Cone Uncoiler

Fast coil loading and automatic decoiling with tension control, supports heavy coils.

2

Shear & Butt Welder

Connects two steel strips via automatic shearing and welding to ensure uninterrupted production.

3

Accumulator

Stores steel strip during coil changes to avoid line stoppage and maintain continuity.

4

Forming Mill (Roughing + Finishing)

Gradually bends the flat strip into a round tube; roughing pre-forms, finishing refines.

5

HF Induction Welder + Cooling System

Induction heating and welding of strip edges; water cooling protects equipment and product.

6

Inner & Outer Burr Removers

Removes welding flash to improve pipe appearance and internal smoothness.

7

Sizing & Straightening Section (with Round-to-Square)

Adjusts pipe dimensions, supports square and rectangular tube production.

8

Flying Saw Cutting System

Cuts pipes at preset lengths; supports hot saw, cold saw, or milling cutter.

9

Output Conveyor + Stacker

Automatically aligns, stacks, and discharges finished pipes for further processing.

10

Centralized Electrical Control (PLC+HMI)

Controls the entire line, supports one-button start, fault alarms, and data records.

 

2.  BASIC DESIGN DATA

Design of the proposed line is based on following specification:

Item

Parameter Range

Pipe Diameter

Φ114mm – Φ325mm

Wall Thickness

3.0mm – 12.0mm

Strip Material

Q195, Q235, Q345, X42, X52, etc.

Strip Width

350mm – 1000mm

Forming Speed

5 – 20 m/min (depending on thickness)

HF Power

400 – 1000 kW (recommended customization)

Main Drive Power

90 – 160 kW

Cutting Tolerance

±2mm

Total Installed Power

800 – 1200 kW

Sizing section and Turkey section usage 

Sub-unit

Function

Sizing Mill

Multiple roll stands for radial shaping and sizing with quick-adjust design.

Round-to-Square Unit

Converts round tubes into square/rectangular ones by changing only sizing rolls.

Straightening Device

Corrects axial distortion caused by welding/forming to improve straightness and ovality.

Surface Polishing Unit

Light pressing/polishing rolls improve appearance, suitable for decorative/furniture-grade tubes.

Independent Drive System

Each stand is driven by variable frequency motors for segmental speed control and easy upgrades.

Advantages:

  • Dimensional accuracy within ±0.5mm

  • Fast mold change and format switching

  • Improved product straightness and form

  • Compatible with downstream processes like coating, galvanizing, perforation

  • Suitable for structural, mechanical, construction, transport, and furniture applications

 

Finishing Auxiliary Equipment Description   

Equipment Name

Function Description

Pipe Straightening Machine

Corrects bending, waves, or twisting formed during welding or cooling using 6 or 7 rollers with adjustable pressure.

Hydrostatic Tester

Injects pressurized water (up to 23MPa) into the pipe to test for leaks or burst defects.

Pipe End-Facing (Milling) Machine

Mills pipe ends flat and burr-free for flange connection or girth welding; includes automatic clamping and dual-head milling.

Eddy Current Tester

Non-destructive inspection using eddy current sensors to detect surface or near-surface defects, especially in welds.

Automatic Pipe Bundling Machine

Automatically aligns, counts, bundles, and wraps finished pipes. Often includes lifting table, steel strapping, and film wrapping systems.

erw tube mill finishing section machine

erw pipe hydro tester machine and chamfer machine 

Operating Procedure 

  1.  
  2.  

  • double cone heavy duty Uncoiler
  • big size pipe making machine
      • 8inch pipe milling saw cutoff
      • 10inch round pipe
  • landing type horizontal accumulator
  • 273 steel pipe making machine

 

Selection Advice for Customers


  1.  

    • For export or high-end pipe markets, it's recommended to include hydrostatic testing and eddy current inspection systems.

    • For pipe end processing requirements, add the end-facer for precision preparation.

    • Straighteners and bundlers are standard for large-diameter lines and improve finishing automation.

    • All machines can be integrated into a centralized control system for digital traceability and smart management.

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12inch ERW tube Mill FAQs

Can this machine produce square tubes?

Yes, round-to-square or direct square forming modules are available for fast format switching.

Can it handle wall thicknesses above 10mm?

Yes, with an optional 1000kW HF welder, the line can stably weld pipes with up to 12mm wall thickness.

Is the machine suitable for standard workshops?

Yes, the line layout is compact and fits well in workshops 16–18 meters wide.

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