ASTM A213 TP 321 Seamless Tubes

ASTM A213 TP 321 Seamless Tubes

ASTM A213 TP 321 Seamless Tubes are titanium-stabilized austenitic stainless steel tubes designed for high-temperature service applications. The addition of titanium improves resistance to intergranular corrosion after welding and exposure to elevated temperatures.

Grade 321 is particularly suitable for continuous service in temperatures up to 870°C, offering excellent oxidation resistance and long-term structural stability in demanding industrial environments.

Specifications

Standard	ASTM A213 / ASME SA213
Grade	TP 321
Manufacturing Process	Seamless (Cold Drawn / Hot Finished)
Outside Diameter	6 mm to 114.3 mm
Wall Thickness	0.5 mm to 12 mm
Length	Up to 6 Meters / Custom Length
Surface Finish	Annealed & Pickled, Bright Annealed
End Type	Plain End / Beveled End

Key Benefits

• Stabilized Against Intergranular Corrosion: Titanium addition prevents carbide precipitation.
• Excellent High-Temperature Strength: Suitable for continuous elevated temperature service.
• Good Oxidation Resistance: Performs well in high-heat environments.
• Superior Weldability: Maintains structural integrity after welding.
• Long-Term Durability: Reliable performance in heat exchangers and boiler systems.

Chemical Composition (Typical)

Element	321 (%)
Carbon	0.08 Max
Chromium	17.0 – 19.0
Nickel	9.0 – 12.0
Titanium	5x(C) Min – 0.70 Max

Applications

• Boilers & Superheaters
• Heat Exchangers
• Petrochemical Processing Equipment
• Power Generation Plants
• High-Temperature Piping Systems

Quality Testing

• Hydrostatic Testing
• Ultrasonic Testing (UT)
• Eddy Current Testing
• Flattening & Flaring Tests
• Dimensional Inspection

Conclusion

ASTM A213 TP 321 Seamless Tubes provide excellent high-temperature performance, resistance to intergranular corrosion, and reliable mechanical strength. They are widely used in heat-intensive industrial applications where long-term durability and stability are essential.