Stainless Steel Capillary Tube

Specifications of Stainless Steel Capillary Tube

Product Name	Stainless Steel Capillary Tube
Thickness	0.1mm – 3mm or as per customer’s requirements
Outer Diameter	0.1mm – 13mm or as per customer’s requirements
Length	6m or custom cut (e.g., 1m, 2m)
Standard	ASTM, DIN, EN, GB, JIS
Technique	Cold rolled，Hot rolled
Material Grade	430, 316L, 316, 321, 310, 310S, 304, 304L, 302, 301, 202, 201, etc.
State	Soft, Hard
Surface Treatment	Polishing, passivation, chemical coloring, PVD coating, etc.
MOQ	5 tons
Packing	Wooden pallets, wooden boxes, paper boxes, or as requested

Advantages of Stainless Steel Capillary Tube

• Excellent Corrosion Resistance: Stainless steel’s corrosion resistance allows for superior corrosion resistance in harsh environments.
• High-Precision Dimensions: Tube diameters can be accurately measured to 0.1mm, with extremely tight tolerances for both inner and outer diameters.
• Excellent Mechanical Properties: High strength and toughness are combined, offering excellent resistance to compression and bending.
• High Cleanliness and Hygiene: Polishing creates a smooth, non-adsorbent, and non-breeding effect on the tube surface.
• Wide Applicability: A wide range of materials and finishes (soft/hard) are available, allowing for flexible selection based on specific needs.

Applications of Stainless Steel Capillary Tube

• Medical Devices: Injection needles, minimally invasive surgical instruments, endoscope components, catheters, and IV tubing.
• Instruments: Protective tubes for electronic component wires, sensors, pressure sensor piping, and small transformer winding bobbins.
• Aerospace: Fuel delivery pipes, micro-pipes for hydraulic systems, and protective sleeves for tiny sensors.
• Industrial Equipment: Light guides for laser equipment, coolant lines, and precision gas/oil lines for automation equipment.
• Refrigeration and HVAC: Used as throttling capillaries in air conditioners, refrigerators, and heat pumps.

Stainless Steel Capillary Tubing Production Process

1. Material Cutting: High-precision equipment is used to cut stainless steel sheets or coils into the desired dimensions, laying the foundation for precise tube production.
2. Rolling: The cut stainless steel sheets are then hot-rolled (for thicker, stronger tubes) or cold-rolled (for thinner, smoother tubes) to form the initial capillary tube shape.
3. Tubing Drawing: A critical step, the tube is drawn to the target diameter and wall thickness using a tube drawing machine equipped with dies (operating at high temperatures to maintain the stainless steel’s plasticity).
4. Heat Treatment: The tube is heated to a high temperature and then subjected to controlled cooling to eliminate internal stresses and enhance hardness and corrosion resistance.
5. Cutting and Shaping: Cutting into specified lengths as required, followed by cold bending and other processes to achieve the final shape and dimensions.
6. Surface Treatment: Polishing, pickling, or electrochemical polishing are optional to optimize appearance and corrosion resistance.

FAQ About SS Capillary Tube

Q: What’s the difference between stainless steel capillary tubing and ordinary stainless steel tubing?

The difference lies in the very small diameter of stainless steel capillary tubing, allowing for more precise dimensions and common applications.

Q: What’s the difference between 304 and 316L stainless steel capillary tubing, and how do you choose?

• 304 stainless steel: Highly cost-effective, versatile, and corrosion-resistant;
• 316L stainless steel: Contains molybdenum, offering enhanced resistance to acids, alkalis, and seawater;
• Selection principle: 304 is used for general environments, while 316L is essential for harsh environments or medical applications.

Q: What’s the difference between “soft” and “hard” stainless steel capillary tubing?

• Soft: The material is softer and more flexible, making it suitable for applications requiring coiling and bending.
• Hard: High strength and rigidity, resist bending, making it suitable for applications requiring a straight shape and pressure resistance.

Q: How do you judge the quality of stainless steel capillary tubing?

• Dimensional Accuracy: Use a micrometer to measure inner and outer diameters and wall thickness, and the tolerances must meet requirements.
• Surface Condition: The inner wall must be free of scratches and the outer wall must be free of scale. Polished parts must have a uniform gloss.
• Performance Testing: Pressure leak testing is required for high-pressure applications, and salt spray testing is required for corrosion applications.

Q: What is the minimum order quantity for your stainless steel capillary tubing? Can you provide samples?

• We are a factory and offer bulk wholesale pricing. The minimum order quantity is 5 tons, and the larger the quantity, the better the price.
• We can provide free samples, but you may be required to pay for shipping.

Why Choose Us

• Full Quality Control: Strict quality control is performed throughout the entire production process to ensure that every capillary meets standards.
• High Quality: Our stainless steel capillaries feature a superior surface quality, uniform wall thickness, and stable performance.
• Extensive Experience: With 17 years of manufacturing expertise and 14 years of export experience, we deliver cost-effective solutions.
• Flexible Services: We offer cutting, bending, polishing, and other processing options, along with custom fabrication.

Wanzhi Steel, certified under ISO 9001, ISO 14001, and other standards, is committed to providing customers with high-quality stainless steel tubing products. In addition to stainless steel capillary tubes, we supply stainless steel square tubes, round tubes, and stainless steel tubes in various materials. For any requirements, please feel free to contact us.