Stainless Steel 316 Seamless Micro Tubes are cold drawn without a weld seam to achieve the tight dimensional control small bore instrumentation and high purity systems require. Supplied from 0.20mm to 6.35mm outside diameter in SS 316 and low carbon SS 316L, these tubes offer consistent wall thickness, a smooth bore, and the pitting and crevice corrosion resistance molybdenum provides in chloride bearing environments. Amardeep Steel manufactures and supplies SS 316 seamless micro tubes in cut to length, coiled, and spooled form for aerospace, medical, and analytical instrumentation applications in India.
Technical Data
Specifications of Stainless Steel 316 Seamless Micro Tubes
| Parameter | Specification Details |
|---|---|
| Outside Diameter (OD) | 0.008″ to 0.250″ (0.20 mm to 6.35 mm) |
| Wall Thickness (WT) | 0.002″ to 0.035″ (0.05 mm to 0.88 mm) |
| Dimensional Tolerances | Tight tolerance options down to ±0.0005″ (±0.012 mm) on OD/WT |
| Manufacturing Process | Cold Drawn (CD), Seamless |
| Material Conditions / Tempers | Annealed (Soft), 1/4 Hard, 1/2 Hard, Full Hard |
| Delivery Forms | Cut-to-length straight tubes, continuous coiled tubing, spools |
| Surface Finish Options | Mill finish, Bright Annealed (BA), Mechanically Polished, Electropolished (15 Ra Max / 0.4 µm Ra) |
| End Finishes | Square cut, burr-free, chamfered, closed end, or flared |
| Applicable Specifications | ASTM A213 / A213M, ASTM A269 / A269M, ASTM A632 |
| Material Test Certificates | EN 10204 3.1 / EN 10204 3.2, PMI Test Reports, NDT Reports |
Stainless Steel 316 Seamless Micro Tubes Chemical Compositions
| Grade | Carbon (C) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) | Chromium (Cr) | Molybdenum (Mo) | Nickel (Ni) |
|---|---|---|---|---|---|---|---|---|
| SS TP316 | 0.08 Max | 2.0 Max | 1.0 Max | 0.045 Max | 0.030 Max | 16.0 – 18.0 | 2.0 – 3.0 | 11.0 – 14.0 |
Mechanical Properties of Stainless Steel 316 Seamless Micro Tubes
| Grade | Min. Heat Treatment Temp. (°C) | Tensile Strength (MPa Min.) | Yield Strength 0.2% Offset (MPa Min.) | Elongation (% Min.) | Brinell Hardness (HBW Max) | Rockwell Hardness (HRB Max) | Vickers Hardness (HV Max) |
|---|---|---|---|---|---|---|---|
| SS 316 | 1040 | 515 | 205 | 35% | 192 | 90 | 200 |
ASTM A213 TP316 Stainless Steel Seamless Micro Tubes Equivalent Grades
| Grade | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
|---|---|---|---|---|---|---|---|
| SS 316 | 1.4401 | S31600 | SUS 316 | 316S31 | 08KH16N11M3 | Z6CND17-11 / Z7CND17-11-02 / Z7CND17-12-02 | X5CrNiMo17-12-2 |
Dimensions Chart of Stainless Steel 316 Seamless Micro Tubes
| Gauge | Outer Diameter (in) | Inner Diameter (in) | Wall Thickness (in) | Outer Diameter (mm) | Inner Diameter (mm) | Wall Thickness (mm) |
|---|---|---|---|---|---|---|
| 36 | 0.008 | 0.004 | 0.002 | 0.203 | 0.101 | 0.051 |
| 34 | 0.009 | 0.005 | 0.002 | 0.229 | 0.127 | 0.051 |
| 33 | 0.010 | 0.006 | 0.002 | 0.254 | 0.152 | 0.051 |
| 31 | 0.011 | 0.004 | 0.004 | 0.279 | 0.102 | 0.089 |
| 30 | 0.012 | 0.006 | 0.003 | 0.305 | 0.152 | 0.077 |
| 29 | 0.013 | 0.007 | 0.003 | 0.330 | 0.178 | 0.076 |
| 28 | 0.014 | 0.007 | 0.0035 | 0.356 | 0.178 | 0.089 |
| 27 | 0.016 | 0.008 | 0.004 | 0.406 | 0.203 | 0.102 |
| 26 | 0.018 | 0.010 | 0.004 | 0.457 | 0.254 | 0.102 |
| 25 | 0.020 | 0.010 | 0.005 | 0.508 | 0.254 | 0.127 |
| 24 | 0.022 | 0.012 | 0.005 | 0.559 | 0.305 | 0.127 |
| 23 | 0.025 | 0.013 | 0.006 | 0.635 | 0.330 | 0.152 |
| 22 | 0.028 | 0.016 | 0.006 | 0.711 | 0.406 | 0.152 |
| 21 | 0.032 | 0.020 | 0.006 | 0.813 | 0.508 | 0.152 |
| 20 | 0.035 | 0.023 | 0.006 | 0.889 | 0.584 | 0.152 |
Applications and Industrial Uses of Stainless Steel 316 Seamless Micro Tubes
- Aerospace Fuel and Hydraulic Lines
- Marine and Subsea Equipment
- Heat Exchanger Instrumentation
- Semiconductor Processing Equipment
- Food and Beverage Processing
- Gas Sampling Systems
- High-Purity Fluid Handling Systems
- Automotive Fuel Injection Systems
Frequently Asked Questions
What are Stainless Steel 316 Seamless Micro Tubes?
SS 316 Seamless Micro Tubes are small-diameter tubes made without a welded seam, providing uniform strength, good dimensional accuracy, and corrosion resistance.
What is the difference between SS 316 and SS 316L Seamless Micro Tubes?
SS 316L has lower carbon content than SS 316, giving it better resistance to intergranular corrosion after welding or heat exposure.
Are SS 316 Seamless Micro Tubes suitable for high-pressure applications?
Yes, they are suitable for high-pressure applications when the tube size, wall thickness, material grade, and operating conditions are properly selected.
Why is molybdenum added to SS 316 Micro Tubes?
Molybdenum improves resistance to pitting and crevice corrosion, especially in chloride-rich and marine environments.
Are SS 316 Seamless Micro Tubes corrosion-resistant?
Yes, SS 316 Seamless Micro Tubes offer excellent corrosion resistance, particularly against chlorides, chemicals, and marine environments.
