Stainless Steel 316 Welded Capillary Tubes Manufacturer, Supplier and Exporter in India
Amardeep Steel Centre specialises in manufacturing and supplying Stainless Steel 316 welded capillary tubes for precision applications requiring corrosion resistance, dimensional accuracy, and consistent performance. Manufactured to ASTM A269 standards, these fine-bore tubes are available in outer diameters from 0.3 mm to 10 mm and can be supplied in straight lengths or coils. SS 316 offers enhanced resistance to chloride-containing and corrosive environments due to its molybdenum content, making it suitable for instrumentation, laboratory equipment, chemical processing, marine applications, and other demanding systems. We supply welded capillary tubes with material traceability and EN 10204 3.1 Mill Test Certificates and export our products to customers in more than 40 countries.
Technical Data
ASTM A269 and ASTM A249 SS 316 Welded Capillary Tube Specifications
| Specification | Detail |
|---|---|
|
Standard |
ASTM A269, ASTM A213, ASTM A249, EN 10216 5 |
|
Grade |
SS 316, UNS S31600, Werkstoff 1.4401 / 1.4436, JIS SUS 316 |
|
Outer diameter |
0.3 mm to 10 mm, larger sizes on request |
|
Wall thickness |
0.08 mm to 1.5 mm |
|
Length |
Cut length, fixed length, single random, double random or continuous coil |
|
Type |
Welded, with seamless also available on the same page range |
|
Form |
Round, straight or coiled |
|
End finish |
Plain end or bevelled end |
|
Surface finish |
Bright annealed, pickled, polished or electropolished |
|
Certification |
EN 10204 3.1 Mill Test Certificate standard, 3.2 on request |
For raw material specifications used during processing, examine our technical sheet for stainless steel 316 plates, sheets, and coils.
Chemical Composition of Stainless Steel 316 Capillary Tubes
| Grade | UNS | C max | Mn max | Si max | P max | S max | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|---|
|
TP316 |
S31600 |
0.08 |
2.00 |
1.00 |
0.045 |
0.030 |
16.0 to 18.0 |
10.0 to 14.0 |
2.0 to 3.0 |
Mechanical Properties of SS 316 Capillary Tubes
| Property | Value |
|---|---|
|
Tensile strength, minimum |
515 MPa (75000 psi) |
|
Yield strength, 0.2 percent proof, minimum |
205 MPa (30000 psi) |
|
Elongation in 50 mm, minimum |
35 percent |
|
Hardness, maximum |
95 HRB |
|
Solution annealing temperature |
Approximately 1040 C, followed by rapid cooling |
|
Maximum continuous service temperature |
Approximately 925 C in oxidising atmospheres |
Equivalent Grades for Stainless Steel 316 Capillary Tube
| Standard | UNS | Werkstoff | AFNOR | EN name | JIS | Old BS |
|---|---|---|---|---|---|---|
|
SS 316 |
S31600 |
1.4401 / 1.4436 |
Z7CND17 11 02 |
X5CrNiMo17 12 2 |
SUS 316 |
316S31 / 316S33 |
Stainless Steel 316 Capillary Tubes Dimension Chart
| Outer diameter (mm) | Wall thickness (mm) | Inner diameter (mm) |
|---|---|---|
|
0.30 |
0.08 |
0.14 |
|
0.50 |
0.10 |
0.30 |
|
0.80 |
0.15 |
0.50 |
|
1.00 |
0.20 |
0.60 |
|
1.50 |
0.25 |
1.00 |
|
2.00 |
0.30 |
1.40 |
|
3.00 |
0.50 |
2.00 |
|
4.00 |
0.50 |
3.00 |
|
6.00 |
1.00 |
4.00 |
|
8.00 |
1.00 |
6.00 |
|
10.00 |
1.50 |
7.00 |
Dimensional Tolerances for Stainless Steel 316 Capillary Tube
| Size range | Outer diameter tolerance | Wall thickness tolerance | Length tolerance |
|---|---|---|---|
|
Up to 2 mm OD |
Plus or minus 0.02 mm |
Plus or minus 10 percent |
Plus 3 mm, minus 0 mm |
|
2 mm to 6 mm OD |
Plus or minus 0.05 mm |
Plus or minus 10 percent |
Plus 3 mm, minus 0 mm |
|
6 mm to 10 mm OD |
Plus or minus 0.08 mm |
Plus or minus 10 percent |
Plus 3 mm, minus 0 mm |
Frequently Asked Questions
What is a stainless steel 316 welded capillary tube?
It is a fine-bore precision tube, generally under about 10 mm outer diameter, formed from strip of grade 316 stainless steel that is welded along the seam and drawn down to final size. It is made to ASTM A269, ASTM A213 or ASTM A249 under UNS S31600 and is used wherever a system needs a corrosion-resistant, small, accurately sized channel rather than a general-purpose pipe.
What is the difference between SS 316 capillary tubes and normal SS 316 tubes?
A capillary tube is generally under about 10 mm outer diameter with a thin wall and very tight dimensional tolerance, built for accurate low-volume flow in sensing and measurement duty. A normal tube or pipe is larger, carries heavier wall thickness for the same duty and is intended for general fluid or gas transport rather than precision measurement.
What is the difference between seamless and welded SS 316 capillary tubes?
A seamless tube is drawn from a solid billet with no weld line, giving a more uniform wall, a smoother bore and a higher pressure rating for a given size. Welded tube is formed from strip and welded before being drawn to final size, and it is a more economical option that suits the great majority of instrumentation and sensing duty.
What sizes are available for SS 316 capillary tubes?
We stock outer diameters from around 0.3 mm up to 10 mm, with wall thicknesses from about 0.08 mm to 1.5 mm, in cut lengths or continuous coil, across both welded and seamless construction. Larger sizes and custom combinations are available on request.
Which industries commonly use SS 316 capillary tubes?
Medical and surgical instruments, chromatography and laboratory equipment, instrumentation and pressure sensing, high-pressure hydraulic lines, chemical and petrochemical processing, marine and offshore applications, heat exchangers, and aerospace and defence all rely on SS 316 capillary tube where chloride resistance is important.
Get a Competitive Quote for Stainless Steel 316 Welded Capillary Tubes
Amardeep Steel Centre supplies stainless steel 316 welded capillary tubes with complete documentation, including the EN 10204 3.1 Mill Test Certificate. Request a quote or contact our Mumbai office with your outer diameter, wall thickness, and quantity.
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316 family: SS 316 Pipes & Tubes, SS 316 Micro Tubing, SS 316 Coil Tube Manufacturer, SS 316 Flanges, SS 316 Buttweld Fittings
