🏭 How Does a 5 Inch (127mm) ERW Tube Mill Work?

A 5 inch (127mm) ERW tube mill is a complete production line used to manufacture steel pipes with a diameter range of 38–127mm. It is widely used in construction, scaffolding, greenhouse structures, furniture, and industrial applications.

This article explains the full working process of a 5 inch ERW tube mill line, step by step.

⚙️ 1. Coil Loading & Uncoiling Section

The process starts with a steel coil loaded onto the uncoiler.

• The steel strip is unwound automatically
• Coil tension is controlled for stable feeding
• Heavy-duty uncoiler ensures continuous production

👉 This step ensures smooth material supply to the line.

✂️ 2. Shearing & Butt Welding (Optional)

Before forming begins, the strip head and tail can be:

• Cut and aligned
• Welded with the next coil

This allows non-stop production, improving efficiency.

📦 3. Accumulator Section

The accumulator stores steel strip temporarily.

Its function is:

• Maintain continuous feeding
• Allow coil change without stopping production
• Improve line efficiency

👉 This is essential for high-speed tube production.

🔧 4. Forming Section (Key Process)

This is the most important part of the tube mill.

The flat steel strip passes through multiple roller stands:

• Gradually formed into a round shape
• Controlled deformation to avoid material stress
• Precise roll design ensures accurate diameter

👉 At this stage, the strip becomes a “tube shape” but not yet welded.

⚡ 5. High Frequency Welding Section (HF Welding)

After forming, the tube edges are:

• Heated by high-frequency current
• Pressed together under pressure rollers
• Seam welded instantly

👉 This is the core technology of ERW tube mills.

Benefits:

• Strong welding seam
• High production speed
• Stable quality

❄️ 6. Cooling Section

After welding:

• The tube is cooled by water or air system
• Stabilizes weld seam structure
• Prepares tube for sizing

📏 7. Sizing Section

Sizing rollers ensure final pipe accuracy:

• Adjust diameter precisely
• Improve roundness and straightness
• Remove internal stress

👉 This guarantees final product quality.

✂️ 8. Cutting Section (Flying Saw)

The pipe is cut into fixed lengths using a flying saw:

• No need to stop line
• High-speed synchronized cutting
• Accurate length control

Common cutting options:

• Cold saw
• Friction saw

📤 9. Run-out Table & Collection

Finished pipes are:

• Transported to run-out table
• Automatically stacked
• Prepared for bundling

📊 10. What Can a 5 Inch Tube Mill Produce?

A 5 inch ERW tube mill can produce:

Round pipe:

• 38–127mm

Square pipe:

• 30×30 – 100×100mm

Rectangular pipe:

• 30×40 – 80×120mm

🏗️ Applications of 5 Inch Steel Pipes

• Construction structures
• Scaffolding systems
• Greenhouse frameworks
• Furniture tubes
• Industrial support pipes

💡 Why 5 Inch Tube Mill Is the Most Popular Model?

The 5 inch (127mm) ERW tube mill is widely chosen because:

• Balanced investment cost
• High market demand
• Flexible production range
• Fast ROI for investors

👉 It is the most common entry model for steel pipe factories.

💰 Interested in Tube Mill Price?

The cost of a 5 inch ERW tube mill line depends on:

• Automation level
• Production speed
• Configuration (basic or fully automatic)

👉 For accurate quotation, please contact our engineering team with your pipe requirements.

📞 Get a Custom Solution

AIS Machinery provides complete 5 inch ERW tube mill production lines, including:

• Layout design
• Equipment manufacturing
• Installation guidance
• After-sales service

👉 Contact us for a customized proposal and factory layout design.

🔚 Conclusion

A 5 inch (127mm) ERW tube mill is a complete automated production system combining forming, welding, sizing, and cutting processes.

Understanding the working process helps investors choose the right configuration and improve production efficiency.