304 Stainless Steel Capillary Tube

The Stainless steel capillary tube is a seamless tube manufactured in accordance with ASTM A312 standard specifications. Produced through a cold drawing process, they offer high dimensional accuracy, with outer diameters as small as 0.2mm. They possess excellent corrosion resistance, high mechanical strength, and superior formability, making them suitable for applications in medical devices, automotive, HVAC, instrumentation, and other fields.

Outer Diameter: 0.3mm-25mm (customizable)
Wall Thickness: 0.1mm-6mm (customizable)
Length: Can be customized upon request
Standards: ASTM A312, Or as per customer specifications.
Steel Grade: TP XM-19 TP XM-10 TP XM-11 TP XM-15 TPXM-29 304 304L 304H 304LN 309S 309H 310S 316 316L 316LN 317 321 347 348 904L,etc.

Products Description

Our Advantages

1. High Dimensional Accuracy

The 304 Stainless Steel Capillary Tube is manufactured through multiple cold drawing processes, resulting in high dimensional accuracy. The outer diameter, inner diameter, and wall thickness of the tubing are strictly controlled to meet ASTM A312 standard specifications or customer requirements.
High-dimensional accuracy reduces installation problems, minimizes the risk of leaks, improves system efficiency, and lowers overall quality and maintenance costs, making it ideal for medical equipment, refrigeration systems, instrumentation, and precision fluid control equipment.

2.Corrosion Resistance

304 stainless steel is resistant to corrosion from water, moisture, weak acids, weak bases, industrial liquids, disinfectants, and sterilization chemicals, making it suitable for a wide range of applications.
The tubing surface is pickled, passivated, and polished to ensure its corrosion resistance and cleanliness meet ASTM A312 standard specifications or customer requirements.

3. Excellent Mechanical Properties

The 304 Stainless Steel Capillary Tube possesses high strength, vibration resistance, and fatigue resistance, maintaining its integrity even under continuous vibration and road shocks in automotive engines.
The tubing undergoes rigorous mechanical property testing and is solution annealed to improve its ductility, allowing it to be coiled and bent without cracking.

4. Good Formability

Our capillary tubing is highly flexible and easy to bend and form, suitable for compact system layouts without dimensional deformation.
Industries such as automotive, medical, and refrigeration require tubing that can fit into confined spaces or complex assemblies. Our capillary tubing is available in straight and coiled forms, reducing the need for connectors and welds, thus improving application safety.

application areas

HVAC systems: Capillary tubes for refrigerant flow control
Instrumentation: Used in analytical instruments and sensors, flow measurement, etc.
Medical devices: Fluid delivery lines, laboratory analytical instruments and testing equipment, etc.
Automotive: Fuel injection, emission control systems, sensor protection tubes and signal transmission lines, etc.
Hydraulic and pneumatic systems: Miniature hydraulic lines, pressure sensing and pulse lines, etc.

Chemical Composition

Element	C (%)	Si (%)	Mn (%)	P (%)	S (%)	Cr (%)	Ni (%)
304	≤0.08	≤1.00	≤2.00	≤0.045	≤0.030	18.0–20.0	8.0–10.5

Mechanical Properties

Property	Tensile Strength (MPa)	Yield Strength 0.2% (MPa)	Elongation (%)	Hardness (HB)
304	≥515	≥205	≥40	≤201

Possible Alternative Grades

Alternative Grades	Reasons
316 / 316L	It exhibits high corrosion resistance in chloride-rich environments, making it suitable for marine and chemical applications.
317L	It possesses high strength and excellent corrosion resistance, making it suitable for demanding chemical applications.
904L	It has extremely low susceptibility to pitting corrosion, crevice corrosion, and stress corrosion cracking, making it ideal for highly corrosive chemical and petrochemical process lines.