14inch 355mm ERW Tube Mill

This line adopts continuous cold roll forming and high-frequency induction welding. It features FFX forming technology and quick roll-change systems, offering high efficiency, precision forming, and fast size switching. It is especially suited for high-spec structural, pressure, and API-grade 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
 

Coil Loading → Uncoiling → Shear & Butt Welding → Accumulator → Forming → HF Welding → Deburring → Cooling → FFX Sizing/Forming → Flying Saw Cutting → Straightening → Hydrostatic Testing → Oiling/Painting → Automatic Bundling

 
No. Equipment Name Function Description
1 Hydraulic Coil Car + Uncoiler Loads and uncoils steel coil with auto tensioning; supports heavy coils
2 Shear & Butt Welder Connects two coils end-to-end without stopping the main line
3 Accumulator Maintains strip supply during coil change
4 FFX Forming Mill Flexible forming system that auto-adjusts roll positions for round and square tubes
5 HF Induction Welding Machine Precisely welds the strip edges using high-frequency induction
6 Inner & Outer Deburring Device Removes weld flash to improve pipe appearance and quality
7 Water Cooling Spray System Rapid cooling of weld seam and full pipe to maintain shape
8 FFX Sizing & Shaping Unit Finely adjusts outer diameter and shapes square/rectangular tubes
9 Flying Saw Cutting System High-speed synchronized pipe cutting; hot saw, cold saw, or milling cutter available
10 Quick Roll Change Unit Enables fast mold changes to minimize downtime and labor
11 Straightening Machine Corrects pipe axis bending and improves straightness
12 Hydrostatic Testing Machine Pressure testing for strength/sealing per API 5L/5CT standards
13 Oiling/Painting Unit Applies anti-corrosion oil or paint to pipe surfaces
14 Automatic Pipe Bundling System Automatically counts, aligns, and straps finished pipes for packaging
15 Central Control System (PLC + HMI) Manages line operations, alarms, data, and supports remote service
 

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

Forming and Sizing section FFX Forming Technology

FFX (Flexible Forming Express) is an advanced forming system that uses universal rolls in the open section and adjusts roller positions (up/down, left/right) to accommodate various pipe sizes and wall thicknesses. Key advantages:

  • 🔄 Quick Changeover: Only sizing rolls need to be replaced, switching in 10–20 minutes

  • 💰 Tooling Cost Saving: 80%+ roll sets are reusable across sizes

  • 🎯 High Dimensional Accuracy: Enhances weld seam alignment and consistent outer diameter

  • ⚙️ Smart Integration: Compatible with auto roll change carts and parameter memory systems

 

Quick Roll Change System Advantages:

  • The system allows fast replacement of full roll stands:

  • Rails or hydraulic carts slide out entire roll units

  • Single-button locking and positioning

  • Less than 20 minutes per changeover

  • Supports mold ID management and digital recipe storage

 

Finishing Auxiliary Equipment Description   

Equipment Name Function Description
Hydrostatic Tester Up to 25MPa pressure test for pipe strength/sealing, auto water injection & drain
Eddy Current Tester Online NDT for welds and pipe body to detect cracks, inclusions, or lack of fusion
Pipe Straightener Corrects axial bending to ensure line shape and straightness
Oiling/Painting Unit Applies protective oil or paint for corrosion resistance and improved appearance
Pipe End Chamfering Machine Optional for beveling or API thread-end preparation
 

erw tube mill finishing section machine

erw pipe hydro tester machine and chamfer machine 

Operating Procedure 

  1.  
  2.  

  • double cone heavy duty Uncoiler
  • horizontal sprial accumulator
      • ffx forming and sizing section
      • 14inch milling saw to sell
  • solid state induction welding machine contact type
  • Hydrostatic Testing Machine

 

Product Applications 


  1.  

    • This line is suitable for manufacturing high-quality large-diameter pipes used in:

      • ✅ Oil & gas pipelines (API 5L)

      • ✅ Foundation piles, bridge piles, port structure pipes

      • ✅ Municipal water and drainage systems

      • ✅ Steel construction and heavy-duty structural tubing

      • ✅ Conduit and pressure pipes for industrial use

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14inch ERW tube Mill FAQs

Weak or inconsistent weld seam

Low HF power or misaligned strip edges,Adjust HF coil and impedance position, increase power

Dimensional deviation in pipe

FFX parameters not calibrated or roller offset, Recalibrate forming & sizing section using presets

Cutting length inaccuracy

Dull saw blade or servo mismatch ,Replace blade, re-synchronize flying saw encoder

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