ASTM A269 TP 321 Seamless Tubes

ASTM A269 TP 321 Seamless Tubes

ASTM A269 TP 321 Seamless Tubes are titanium-stabilized austenitic stainless steel tubes designed for improved resistance to intergranular corrosion, especially after exposure to high temperatures. The addition of titanium helps prevent carbide precipitation, making TP 321 suitable for elevated temperature service.

These seamless tubes are commonly used in heat exchangers, boiler components, and instrumentation systems where strength, oxidation resistance, and corrosion resistance are critical.

Specifications

Standard	ASTM A269
Grade	TP 321
Manufacturing Process	Seamless (Cold Drawn)
Outside Diameter	6 mm to 50.8 mm
Wall Thickness	0.5 mm to 6 mm
Length	Up to 6 Meters / Custom Length
Surface Finish	Annealed & Pickled, Bright Annealed
End Type	Plain End

Key Benefits

• Titanium Stabilization: Excellent resistance to intergranular corrosion.
• High-Temperature Strength: Suitable for elevated temperature applications.
• Good Oxidation Resistance: Performs well in high heat environments.
• Reliable Weldability: Reduced risk of sensitization during welding.
• Durable & Long-Lasting: Ideal for critical industrial operations.

Chemical Composition (Typical)

Element	321 (%)
Carbon	0.08 Max
Chromium	17.0 – 19.0
Nickel	9.0 – 12.0
Titanium	5 x (C + N) Min
Manganese	2.0 Max

Applications

• Heat Exchangers
• Boiler Tubes
• Petrochemical Plants
• Oil & Gas Processing
• Power Generation
• Instrumentation Systems

Quality Testing

• Hydrostatic or Air Underwater Testing
• Ultrasonic Testing (UT)
• Eddy Current Testing
• Tensile & Hardness Testing
• Dimensional & Visual Inspection

Conclusion

ASTM A269 TP 321 Seamless Tubes provide reliable performance in high-temperature and corrosive environments. Their titanium stabilization ensures resistance to intergranular corrosion, making them a dependable choice for heat-intensive industrial applications requiring strength and durability.