What Is an SS Pipe Making Machine?Comparison with other Stainless Steel Tube Mill

1. What Exactly Is an SS Pipe Making Machine?

It is a complete production line that transforms stainless steel strip coils into welded stainless steel pipes or tubes using roll forming + longitudinal welding. It is designed for mass production of precision tubes in various diameters, wall thicknesses, and surface finishes.

2. Complete Machine Composition (In-Depth)

Entry Section:

Loop Accumulator:

Allows continuous operation during coil changeovers

Maintains production speed

Forming Section:

Forming rolls (typically 8–20 stands)

Gradually bend the strip into a tube shape

Welding Section:

Bead Removal:

Internal/External bead removal knives

Polishing tools for decorative or sanitary applications

Sizing & Straightening Section:

Ensures final OD, roundness, and straightness

Heavy-duty stands with hard steel or carbide rollers

Cooling System:

Water spray or full bath system to cool weld zone

Cutting Unit:

Run-Out Table:

Collects pipes automatically

Optional bundling or stacking system

3. Technical Parameters (Advanced)

4. Different Models by Application

5. End Products - Pipe Profiles

Round (Ø6mm to Ø325mm+)

Square (10x10 to 200x200 mm)

Rectangular (e.g., 40x20, 100x50 mm)

Oval, D-shaped, Triangular (decorative)

Special profiles (custom molds)

6. Industrial Applications (Expanded)

Stainless Steel Pipe Manufacturing Process 

1. Raw Material Preparation

Material: Stainless steel coil or strip (e.g., SS201, SS304, SS316L)

Form: Usually cold-rolled or hot-rolled steel in coil form

Width & Thickness: Depends on the final pipe diameter and wall thickness

Material must be cleaned, leveled, and surface-checked for defects before use.

2. Uncoiling

The coil is placed on a hydraulic uncoiler.

The strip is fed into the line in a controlled, tension-free manner.

Optional: A straightener flattens any coil memory before processing.

3. Shearing & End Welding (Butt Welding)

First coil's end is welded to the next coil's start using an automatic TIG or arc welder.

This ensures continuous feeding of material into the line.

Often done near an accumulator to allow nonstop production.

4. Strip Accumulation (Optional)

Stores enough strip material to allow time for the coil change without stopping the line.

Common in high-speed or continuous production lines.

5. Forming (Roll Forming)

The strip passes through multiple roll stands (forming rollers).

Each roller progressively bends the flat strip into a round tube shape.

Roll design ensures gradual shaping to avoid stress cracking.

Forming rolls are custom-designed for pipe size and profile (round, square, oval, etc.).

6. Welding (Seam Joining)

This is the most critical process:

Common Welding Types:

The tube edges are heated and fused together to form a solid, longitudinal weld.

Seam alignment and pressure control are crucial.

7. Weld Bead Removal (Inside/Outside)

Weld creates a bead or ridge inside and outside the pipe.

This bead is removed mechanically:

Internal bead: Using special bead knives or scrapers inside the pipe.

External bead: Ground flush with carbide tools or polishing belts.

For decorative and sanitary pipes, complete bead removal and polishing are essential.

8. Cooling

After welding, the pipe is cooled with water spray or air cooling.

Prevents deformation and ensures weld strength.

Usually followed by drying before sizing.

9. Sizing and Straightening

The semi-finished tube passes through sizing rollers to adjust:

Outer diameter (OD)

Roundness / ovality

Wall concentricity

Also straightens the tube to precise linearity.

This section ensures tight dimensional tolerance (±0.05 mm or better).

10. Cutting to Length

A flying saw or cold saw is synchronized with line speed to cut pipes without stopping.

Cutting types:

Friction saw – high speed, basic use

Cold saw – slow but high precision, clean cut

Standard lengths: 3 m, 6 m, 12 m, or custom.

11. Output / Run-Out Table

Cut pipes are placed onto a run-out table.

May include:

Air blowers (to remove water)

Anti-scratch belts

Automatic stacking or bundling system

12. Post-Processing (Optional)

Depending on the application, post-processing includes:

13. Storage & Packaging

Pipes are:

Bundled with steel strips or PE belts

Wrapped in plastic or kraft paper

End-capped or covered for cleanliness

Placed in wooden pallets or crates for export

 

FAQs – Comparison of Different Tube Mills

1. What is the main difference between these tube mills?

2. What welding method is typically used?

3. What materials are processed by each tube mill?

4. What are the common applications?

5. What are the typical pipe sizes handled?

6. How do the surface finish requirements differ?

7. Which one has the highest production speed?

8. What challenges are unique to each tube mill?

9. What is the cost difference among these machines?

10. Which mill should I choose for my business?