ASTM A269 precision stainless steel pipe is manufactured to the
strict requirements of the ASTM A269 standard, which covers seamless and welded austenitic stainless steel
tubing for general corrosion-resistant and high-temperature
service. This pipe offers excellent dimensional accuracy, clean internal surfaces, and
reliable mechanical properties, making it ideal for instrumentation, medical, and other precision
applications.
Key Features:
- Compliant with ASTM A269 standard
- Seamless or welded & drawn construction
- Tight tolerance: OD up to ±0.05mm (precision grades available)
- Smooth internal surface – no scale or contamination
- Bright annealed finish
- Suitable for bending, flaring, and swaging
Product Specifications
| Parameter | Details |
|---|
| Applicable Standard | ASTM A269 (also compliant with ASME SA269) |
| Common Grades | TP304 / 304L, TP316 / 316L, TP321, TP310S |
| Construction Type | Seamless (SMLS) or Welded & Drawn (W&D) |
| OD Range | 1.6mm – 50.8mm (1/16″ to 2″) |
| Wall Thickness Range | 0.5mm – 5mm (0.020″ to 0.200″) |
| Length | Up to 6m straight lengths, or custom cut |
| Tolerance | Standard: ±0.08mm / Precision: ±0.03mm – ±0.05mm |
| Process | Cold drawn / Cold rolled + Bright annealing |
| Surface Finish | Bright annealed (internal & external) |
| Delivery Condition | Annealed – ready for bending and fabrication |
Chemical Composition (Typical, % per ASTM A269)
| Grade | C | Si | Mn | P | S | Cr | Ni | Mo |
|---|
| TP304 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 18.0-20.0 | 8.0-11.0 | – |
| TP304L | ≤0.035 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 18.0-20.0 | 8.0-12.0 | – |
| TP316 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
| TP316L | ≤0.035 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
| TP321 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 17.0-19.0 | 9.0-12.0 | – |
ASTM A269 requires lower carbon content in “L" grades for improved
weldability and corrosion resistance.
Mechanical Properties (Annealed, per ASTM A269)
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRB / HV) |
|---|
| TP304 | ≥515 | ≥205 | ≥35 | ≤90 HRB |
| TP304L | ≥485 | ≥170 | ≥35 | ≤90 HRB |
| TP316 | ≥515 | ≥205 | ≥35 | ≤90 HRB |
| TP316L | ≥485 | ≥170 | ≥35 | ≤90 HRB |
| TP321 | ≥515 | ≥205 | ≥35 | ≤90 HRB |
Additional Requirements per ASTM A269
| Test | Requirement |
|---|
| Flattening Test | No cracks after flattening to specified height |
| Flaring Test | No cracks after flaring |
| Hydrostatic Test | Leak-free at specified pressure |
| Eddy Current Test | NDT – no defects |
Applications
ASTM A269 precision stainless steel pipe is specified for
applications requiring cleanliness, corrosion resistance, and dimensional precision:
| Industry | Typical Uses |
|---|
| Instrumentation | Pressure gauges, temperature sensors, analytical instruments |
| Medical Devices | Surgical instruments, endoscope tubing, catheters |
| Semiconductor | High-purity gas lines, wafer handling equipment |
| Food & Beverage | Hygienic process lines, dairy equipment |
| Pharmaceutical | Clean steam lines, WFI (water for injection) systems |
| Aerospace | Hydraulic and fuel lines |
| General Industrial | Heat exchangers, condensers, chemical processing lines |
Why ASTM A269?
| Advantage | Benefit |
|---|
| Strict chemical limits | Better corrosion resistance and weldability |
| Annealed condition | Ready for bending, flaring, and swaging |
| Internal cleanliness | No contamination in sensitive systems |
| Wide acceptance | Recognized globally in specification sheets |
| Traceability | Full mill test reports (MTR) available |
Contact Us
For samples, mill test reports (MTR), technical datasheets, or a
custom quote, please contact us.
