14 Inch API Standard ERW Tube Mill

ERW Carbon Steel Tube Mill

Tube Mill Machine Compose

Cold Roll Forming Machine

Steel Coil Slitting Line

Carbon Steel Coil Slitting Line

Steel Coil Cut To Length Line

Auxiliary Equipment And Spare Parts

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

Operating Procedure

Product Applications

- 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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