ASTM A269 316L Welded Capillary Tube: Precision Stainless Tubing for Critical Applications
For instrumentation, chromatography, medical devices, and chemical injection systems, tubing quality defines system reliability. ASTM A269 316L welded capillary tubing combines the molybdenum-enhanced corrosion resistance of 316L stainless steel with the precision dimensional control of welded-and-drawn manufacturing.
Why 316L Stainless Steel?
316L (UNS S31603) adds 2–3% molybdenum to the standard 304L chemistry, providing superior resistance to pitting and crevice corrosion in chloride environments. Its low carbon content (0.030% max) prevents intergranular corrosion after welding. These properties make it the material of choice for saline, chemical, and high-purity fluid handling applications.
The ASTM A269 Standard
ASTM A269 governs welded austenitic stainless steel tubing for corrosion-resistant service. It mandates tighter dimensional tolerances, mechanical testing, and surface quality requirements than structural tube specifications — ensuring suitability for pressure containment and precision fluid transport.
316L Welded Tube Specifications
|
Grade |
TP316L |
|
Standard |
ASTM A269 |
|
Outside Diameter |
3.18-38.1mm |
|
Wall Thickness |
0.4-2.54mm |
|
Length |
≤12m |
|
Inspection |
Appearance / Size / PMI Inspection |
|
Certificates |
ISO / PED |
|
Package |
End protection / Woven bags / Wooden cases |
Key Physical Properties at a Glance
|
Steel grade |
Physical Property |
|||
|
Y.S |
T.S |
EL. |
HRB |
|
|
316L |
≥480 |
≥177 |
≥40 |
≤90 |
|
304 |
≥205 |
≥515-1035 |
≥40 |
≤92 |
|
304L |
≥205 |
≥520 |
≥40 |
≤90 |
|
316 |
≥620 |
≥310 |
≥30 |
≤95 |
|
321 |
≥205 |
≥515 |
≥40 |
≤95 |
|
347 |
≥205 |
≥515 |
≥40 |
≤92 |
What's Inside Your Tube? Exact Composition Matters
|
Material |
Chemical Composition % Max ASTM A269 |
|||||||||
|
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Mo |
Nb |
Ti |
|
|
TP316L |
0.035 |
2 |
0.045 |
0.03 |
1 |
16.0-18.0 |
10.0-15.0 |
2.00-3.00 |
- |
- |
|
TP304 |
0.08 |
2 |
0.045 |
0.03 |
1 |
18.0-20.0 |
8.0-11.0 |
- |
- |
- |
|
TP304L |
0.035 |
2 |
0.045 |
0.03 |
1 |
18.0-20.0 |
8.0-12.0 |
- |
- |
- |
|
TP316 |
0.08 |
2 |
0.045 |
0.03 |
1 |
16.0-18.0 |
10.0-14.0 |
2.00-3.00 |
- |
- |
|
TP321 |
0.08 |
2 |
0.045 |
0.03 |
1 |
17.0-19.0 |
9.0-12.0 |
- |
- |
5C -0.70 |
|
TP347 |
0.08 |
2 |
0.045 |
0.03 |
1 |
17.0-19.0 |
9.0-12.0 |
- |
10C -1.10 |
- |
Key Features of Welded Capillary Tube
-
OD Range: Typically 0.5 mm to 6.35 mm, with custom diameters available
-
Tight Tolerances: OD held to ±0.025 mm for critical instrumentation use
-
Smooth Internal Bore: Consistent ID supports predictable flow and low carryover
-
Full Traceability: Every tube traceable to mill heat number and production lot
Primary Applications
-
Analytical Instrumentation: GC/HPLC sample lines requiring inert, smooth surfaces
-
Medical Devices: Biocompatible tubing for surgical instruments and drug delivery
-
Chemical Injection: Corrosion inhibitor and inhibitor delivery in oil & gas systems
-
Hydraulic/Pneumatic Control: Sensing and impulse lines in process control
ZYTC Alloy Quality Assurance
Every shipment includes full MTRs documenting chemistry, mechanical properties, and dimensional conformance. Optional testing — PMI, hydrostatic, eddy current, surface roughness — available on request. ZYTC Alloy is certified to ISO 9001 and AS 9120B.
Request a quote or technical data:
📧 daisy@zytcsteel.com
📲 +86 17335753350 (WhatsApp/WeChat)
FAQ
Q1: What is the difference between ASTM A269 316L and ASTM A213 TP316L? Which standard should be primarily referenced?
Q2: Can you provide custom cutting services beyond standard lengths?
Q3: Can you supply material compliant with NACE MR0175/ISO 15156 standards for acidic environments?
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