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.
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
|
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 |
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