The ST40G Stainless Steel Small-Diameter Tube Mill is an automated production line designed for manufacturing precision welded tubes with diameters from Φ6 to Φ31.8 mm and wall thicknesses of 0.21 to 1.0 mm. Ideal for automotive fuel lines, heating elements, instrumentation, drinking straws, and decorative micro-tubing, this capillary tube mill delivers high dimensional accuracy, superior surface finish, and reliable weld integrity for demanding industrial applications.

Key Technologies & Processes:

Multi-pass cold drawing technology for ultra-fine tube shaping
TIG / Plasma / Laser welding options for superior seam quality
High-speed operation with low vibration and noise
PLC-based control system for intelligent automation
Surface finishing options including mechanical and electrochemical polishing

Tube Making Range

Item	Round Tube	Square Tube	Rectangular Tube

Tube Diameter Range	Φ6-Φ31.8mm	4×4-10×10mm	3×6-9×11mm
Wall Thickness Range	0.21-1.0mm	0.21-1.0mm	0.21-1.0mm

Capillary Tube Production Process

stainless steel precision micro tube making workflow

Uncoiler: Automatic decoiler with centering function for smooth strip feeding.

Forming Unit: Multi-pass precision roll forming ensures roundness and dimensional stability.

Welding Station: Supports TIG, plasma, or laser welding for clean, high-strength seams.

Internal & External Weld Grinding: Removes weld beads for smooth inner/outer surfaces.

Sizing & Straightening Section: Final calibration for precise diameter and straightness.

Flying Cut-Off Machine: High-speed automatic cutting to preset lengths (0–6m).

Output Platform: Conveyor system for organized collection of finished tubes.

Optional upgrades include inner/outer polishing units, bright annealing furnace, and CNC end-forming machines.

Technical parameters

Model	ST40G
Tube making mode	TIG welding / Plasma welding / Laser welding
Tube making range (mm)	Φ6～Φ31.8
Tube making thickness (mm)	δ0.21～δ1.0
Processing speed (m/min)	2,0～24
Horizontal shaft diameter (mm)	Φ40
Vertical shaft diameter (mm)	Φ25
Main motor power (KW)	5.5KW×1
Grinding motor power (KW)	3×3KW
Overall machine power	28KW
Material feed direction	Feeding

Ultra-Fine Stainless Steel Tube Machine In Action

Showcase the ST40G in action with close-ups of smooth operation, flawless tubing outputs, and satisfied industry clients!

Industry Applications

This micron-level tube mill is widely used in:

Medical Equipment

Catheters, endoscopes, and surgical instruments

Automotive

Fuel lines, brake hoses, sensor tubes and EGR tubes.

Home Appliances

Heating elements and steam irons

Drinking straws and food-grade steel tubing

Food & Beverage

Drinking straws and food-grade tubing

Enhance Your Tube Production Line

Steel Tube Tooling | Mold | Roller

Steel round sqaure Tube Polishing Machines

Round | Square Steel Tube Polishing

CNC Tube Cutting Machines

TIG | Laser Tube Welding Machine

Inline Bright Annealing Machine

Steel Tube Tapering Machine

Everything You Need to Know

Your Ultimate Guide to Selecting Small Diameter Capillary Tube Mill Production Line

What materials can this machine process?

This steel tube production line is compatible with SUS304, SUS316, SUS201, and other austenitic stainless steels. Meets ASTM A554 for structural and decorative tubing.

How precise is the tube forming process?

The ST40G model capillary tube mill ensures:

Outer Diameter Tolerance: ±0.02 mm

Wall Thickness Tolerance: ±0.01 mm

Surface Roughness (Ra): ≤ 0.8 μm (after polishing)

Roundness Deviation: < 0.03 mm

These specifications make it ideal for applications requiring micron-level precision.

What kind of quality inspection systems are included?

The production line integrates real-time non-destructive testing systems , including:

Laser Measurement System: For continuous outer diameter monitoring

Ultrasonic Testing (UT): To detect internal weld defects

Eddy Current Testing (ECT): For surface defect detection