ASTM A269 is a specification for seamless and welded stainless steel tubing for general corrosion-resisting and low- or high-temperature services. The tubes are designed for instrumentation, heat transfer, and other applications where corrosion resistance and high-temperature capabilities are required.
Chemical Composition
The chemical composition of ASTM A269 tubing varies depending on the specific grade, but common grades include:
- 304 (UNS S30400)
- 304L (UNS S30403)
- 316 (UNS S31600)
- 316L (UNS S31603)
- 321 (UNS S32100)
- 347 (UNS S34700)
Mechanical Properties
The mechanical properties of ASTM A269 tubing include:
- Yield Strength: 30,000 psi (205 MPa)
- Tensile Strength: 75,000 psi (517 MPa)
- Elongation: 30-40%
- Hardness: Rockwell B80-90
Dimensions and Tolerances
ASTM A269 tubing is available in a range of dimensions, including:
- Outside Diameter (OD): 1/8 to 48 inches (3 to 1219 mm)
- Wall Thickness: 0.010 to 0.250 inches (0.25 to 6.35 mm)
- Length: Random or cut to length
Tolerances
- OD tolerance: ±0.001 inches (±0.025 mm)
- Wall thickness tolerance: ±0.001 inches (±0.025 mm)
- Length tolerance: ±1/16 inch (±1.5 mm)
Applications
ASTM A269 tubing is used in a variety of applications, including:
- Instrumentation and control systems
- Heat exchangers and condensers
- Chemical processing and storage
- Pulp and paper processing
- Marine environments
- Medical equipment and devices
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