Foshan ST Machineries Technology Co., Ltd.
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different types of stainless steel tube mills

Jun 18, 2025

1. Round Stainless Steel Tube Mill - General Purpose Production

Overview:

This is the most versatile and commonly used tube mill for producing round stainless steel tubes.

 

Production Process:

Uncoiling stainless steel coil

Forming round tube using forming rolls

TIG or HF welding (TIG for clean welds, HF for higher speed)

Weld bead removal (inside and outside, optional)

Sizing and calibration

Straightening and cutting

Polishing (if decorative finish needed)

 

Output:

Diameter: Ø6–114 mm (customizable up to Ø219 mm)

Wall Thickness: 0.3–3.0 mm

Material: 201, 304, 316L stainless steel

 

Applications:

Furniture tubing (table legs, chair frames)

Handrails and balustrades

Conveying tubes

Water lines in food/beverage industries

 

2. Square and Rectangular Tube Mill - For Frame Structures & Fabrication

Overview:

This mill is designed for shaping square or rectangular stainless tubes after the round forming stage.

 

Additional Steps:

After round forming and welding, tubes are reshaped using compression rollers into square/rectangular form.

Precision rollers ensure sharp corners and dimension accuracy.

 

Output:

Sizes: 10x10 mm to 100x100 mm

Wall Thickness: 0.4 – 4.0 mm

 

Applications:

Furniture frames

Door/window frames

Construction supports

Greenhouse structures

 

3. Decorative Tube Mill - Aesthetic Tubes with Mirror Finish

Overview:

Tailored for high-end architectural or interior-use tubing, where the tube's surface finish is key.

 

Technology Features:

TIG welding with low current to avoid discoloration

Optional argon gas protection chamber

Online or offline mirror polishing units (6K–8K finish)

Online eddy current testing for defects

 

Output:

Shape: Round, square, oval, elliptical

Surface: Mirror, hairline, embossed, titanium coated

 

Applications:

Handrails (indoor/outdoor)

Elevator railings

Boutique furniture

Designer kitchen/bath fittings

 

4. Industrial Stainless Steel Tube Mill - For Heavy-Duty Applications

Overview:

Used for producing large-diameter, thick-wall stainless steel pipes for pressure, load, or mechanical environments.

 

Process Enhancements:

Uses HF or SAW welding depending on thickness

Equipped with tension control, powerful roll stands, and CNC saw cutting

Handles automatic weld seam tracking

 

Output:

Diameter: 25–508 mm

Thickness: Up to 12 mm

Materials: 304, 316, duplex stainless

 

Applications:

Structural steel pipes

Heat exchanger tubes

Boiler tubes

Pipelines in petrochemical & power industries

 

5. Precision Stainless Steel Tube Mill - Medical & Instrumentation Use

Overview:

Designed for ultra-tight tolerance tubes used in sensitive industries.

 

Key Features:

Precision TIG or laser welding

Online OD measurement systems

Annealing furnaces for stress relief

Air or vacuum cooling tunnels

 

Output:

OD: Ø1 mm – Ø25 mm

Tolerance: ±0.02 mm

Surface: Polished or pickled

 

Applications:

Catheters, biopsy needles

Fluid flow sensors

Thermowell sheaths

Medical-grade piping

 

6. Profile Tube Mill (Non-Round Shapes) - Custom-Shaped Tubes

Overview:

Used to produce non-standard shapes like oval, D-shape, triangular, racetrack, etc.

 

Output:

Custom dies for each profile

TIG welding with shaping rolls after welding

 

Applications:

Automotive trim tubes

Curtain rods

Office & shop furniture

Architectural features

 

Summary: Which Tube Mill for Which Use?

Mill Type Target Tube Type Best For
Round Tube Mill Round General tubing, pipes, fluid handling
Square/Rectangular Tube Mill Square/Rectangular Frames, construction, furniture
Decorative Tube Mill High-polish tubes Handrails, interiors, visible architecture
Industrial SS Tube Mill Thick-wall, large OD Pressure pipes, structures, HVAC, oil & gas
Precision Tube Mill Small OD, tight tolerance Medical, instruments, sensors
Profile Tube Mill Oval/custom shapes Style-focused products, automotive trims