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Flattener Machine

A Flattener Machine is an important part of modern ERW Tube Mill and Steel Coil Processing Line systems. It levels steel strips by eliminating coil set and residual stress before forming or welding. Ideal for processing carbon steel, galvanized steel, and stainless steel strips, the machine improves strip quality, feeding accuracy, production stability, and the overall performance of the complete manufacturing line.

Product Details

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Product Details

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Specification

Metal coils naturally develop coil set, edge waves, and residual stress after winding and storage. A Flattener Machine, also known as a Strip Leveling Machine or Steel Strip Flattener, is installed in the entry section of an ERW Tube Mill, Slitting Line, or Coil Processing Line to eliminate these defects before the strip enters the next process.

By repeatedly bending the strip through multiple leveling rolls, the machine removes coil curvature, improves flatness, and ensures stable feeding into the forming section. This significantly enhances forming accuracy, welding quality, and finished tube consistency.

Why Is a Flattener Machine Needed?

When steel strip is uncoiled, especially heavy-gauge material, it often retains strong coil memory. If the strip enters the forming mill directly, it may cause:

• Uneven strip feeding
• Forming instability
• Poor weld seam alignment
• Tube size deviation
• Increased roller wear
• Lower production efficiency

A Flattener Machine effectively removes these problems by producing a flatter, stress-relieved strip before forming.

When Should a Flattener Machine Be Used?

In ERW tube production, a Flattener Machine is generally recommended when:

✅Generally, the steel strip thickness exceeds 4mm.

Thicker material has stronger coil memory and higher internal stress after uncoiling. A flattener greatly improves strip straightness and helps ensure smooth shearing, welding, and roll forming. For thin-gauge material, the strip can often be processed directly without a dedicated flattener, depending on the coil quality and production requirements.

Working Principle

🔧The steel strip passes through a pair of pinch rolls and then enters several precision leveling rolls.

Each leveling roll bends the strip alternately upward and downward. This repeated elastic-plastic deformation gradually releases residual stress and removes the coil set, producing a flat strip with improved dimensional stability.

Process Flow

Steel Coil → Uncoiler → Flattener Machine → Shear & Welder → Accumulator → ERW Tube Mill

Main Components

Pinch Rolls
Leveling Rolls (5-roll or 7-roll design available)
Roll Gap Adjustment System
Drive Motor
Transmission System
Heavy-duty Machine Frame
Electrical Control System

Technical Specifications

Item	Specification
Machine Type	Steel Strip Flattener / Leveling Machine
Applicable Material	Carbon Steel, Galvanized Steel, Stainless Steel
Strip Thickness	≥4.0 mm (customizable according to project)
Strip Width	Customized (typically 200–2000 mm)
Leveling Rolls	5 Rolls or 7 Rolls
Roll Material	Alloy Steel, Heat Treated
Roll Hardness	HRC 58–62
Drive Type	AC Motor + Gear Reducer
Speed	Synchronized with production line
Adjustment	Manual or Hydraulic
Installation Position	Entry Section of Tube Mill / Slitting Line

🎯All specifications can be customized according to strip width, thickness, production speed, and line configuration.

Key Advantages

✔ Removes coil set and strip curvature

✔ Improves strip flatness before forming

✔ Reduces residual stress

✔ Ensures stable strip feeding

✔ Improves tube dimensional accuracy

✔ Enhances welding stability

✔ Reduces roller wear

✔ Increases production efficiency

✔ Suitable for continuous production lines

Applications

The Flattener Machine is widely used in:

🛠️ERW Tube Mill
📐Steel Coil Processing Line
🛠️Slitting Line
📐Cut to Length Line (CTL)
🛠️Roll Forming Machine
📐Steel Service Centers

Why Choose AIS Flattener Machine?

AIS Machinery designs Flattener Machines to match different strip widths, thicknesses, and production capacities. Our equipment features a rigid frame, precision leveling rolls, and reliable transmission, providing stable operation even when processing heavy-gauge steel strips.

Whether integrated into a new production line or added to an existing ERW Tube Mill, our Flattener Machine helps improve strip quality, forming performance, and overall production efficiency.

Frequently Asked Questions

1. What is a Flattener Machine?

A Flattener Machine is a strip leveling machine used to remove coil set and residual stress from steel strip before it enters the forming or cutting process.

2. Where is the Flattener Machine installed?

It is typically installed after the uncoiler and before the shear & welder in the entry section of an ERW Tube Mill or coil processing line.

3. Why is a Flattener Machine important?

It improves strip flatness, stabilizes feeding, enhances welding quality, reduces equipment wear, and increases the quality of finished tubes.

4. Do all tube mills require a Flattener Machine?

No. It is generally recommended when processing steel strip thicker than 4 mm or when the incoming material has significant coil set or poor flatness.

5. Can the machine be customized?

Yes. Roll quantity, strip width, thickness range, drive system, and control system can all be customized according to customer requirements.

RELATION EQUIPMENT

We provides all equipment to tube mill entry section:

Coil Car

Single And Double Heads Un-coiler & Hydraulic And Pneumatic Un-coiler

Peeler and hold down roll arm

Flattening Machine

Automatic and Semi Auto Shearer & Butt Welder

Vertical Cage Accumulator & Horizontal Loop Accumulator & Landing Horizontal Spiral Loop Accumulator

disc accumulator to storage strip

erw tube mill feeding section

OUR SERVICE

Why Choose Us?

Leading Technology, Reliable Quality, Excellent Service!

Optimized Design, High quality material select!

Heat treatment process guarantee!

Spiral bevel gear, drum gear coupling and carburization.

Gear teeth quenching.

Driven system stable, efficient and wearable with lower noise.

High precision wear resisting and Long life of rollers.

All the machine Lathes, Key Grooves are positioned and Milled by CNC.

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Flattener FAQ

Where is the Flattener Machine installed?

It is typically installed after the uncoiler and before the shear & welder in the entry section of an ERW Tube Mill or coil processing line.

Why is a Flattener Machine important?

It improves strip flatness, stabilizes feeding, enhances welding quality, reduces equipment wear, and increases the quality of finished tubes.

Do all tube mills require a Flattener Machine?

No. It is generally recommended when processing steel strip thicker than 4 mm or when the incoming material has significant coil set or poor flatness.

Can the machine be customized?

Yes. Roll quantity, strip width, thickness range, drive system, and control system can all be customized according to customer requirements.

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