304/316/316L Staintess Steel Capillary Tube For Medical And Precision Instruments
Stainless steel capillary is an ultra-fine, thin-walled precision tube made of stainless steel. Its core features are extremely small inner diameter (usually between 0.1 mm and several millimeters) and strictly controlled dimensional tolerances.
This structure gives it excellent strength, excellent corrosion resistance and high and low temperature resistance, while enabling precise fluid control or as a protective sleeve.
It is widely used in medical devices (such as needles, catheters), analytical instruments (such as chromatographs), aerospace sensors, industrial instruments, and precision fluid systems that require high reliability and cleanliness.
In the medical field, stainless steel capillaries have become core components of high-end medical devices due to their excellent biocompatibility (commonly used 316L medical grade), precise size control (inner diameter can be less than 0.1mm) and sterile surface properties.
Chemical Composition
| Chemical Composition |
201 |
202 |
301 |
304 |
316 |
430 |
| C |
≤0.08 |
≤0.06 |
≤0.06 |
≤0.06 |
≤0.08 |
≤0.12 |
| S |
≤0.02 |
≤0.02 |
≤0.03 |
≤0.03 |
≤0.03 |
≤0.03 |
| P |
≤0.060 |
≤0.060 |
≤0.045 |
≤0.035 |
≤0.045 |
≤0.04 |
| Mn |
8.5-10.5 |
8.5-10.5 |
≤2.00 |
≤2.00 |
≤2.00 |
≤1.00 |
| Si |
≤1.00 |
≤1.00 |
≤1.00 |
≤1.00 |
≤1.00 |
≤1.00 |
| Cr |
14-15 |
14-16 |
16-18 |
17-20 |
16-18 |
16-18 |
| Ni |
0.8-1.2 |
4-6 |
4-7 |
8-12 |
12-16 |
≤0.05 |
Mechanical Property
|
Mechanical
Property
|
Material Item |
201 |
202 |
304 |
316 |
| Tensile Strength |
≥535 |
≥520 |
≥520 |
≥520 |
| Yield Strength |
≥245 |
≥205 |
≥205 |
≥205 |
| Extension |
≥30% |
≥30% |
≥35% |
≥35% |
| Hardness (HV) |
<105 |
<100 |
<90 |
<90 |
Key Properties & Advantages
Corrosion Resistance: Ideal for harsh environments (chemical, marine, medical).
High Strength-to-Weight Ratio: Withstands pressure despite thin walls.
Cleanliness & Hygiene: Non-reactive surface suits medical/food applications.
Temperature Stability: Performs in extreme heat/cold (e.g., cryogenics).
Precision Flow Control: Used in fluid metering due to consistent bore size.
Applications
Industry Use Cases
Medical Hypodermic needles, endoscopes, surgical tools, fluid transfer systems.
Analytical Instruments Chromatography, spectroscopy, sample introduction lines.
Aerospace/Defense Fuel injection, hydraulic systems, pressure sensors.
Industrial Thermocouple sheaths, precision fluidics, pneumatic controls.
Your message must be between 20-3,000 characters!
