ASTM A312 TP 321 Seamless Pipes

ASTM A312 TP 321 Seamless Pipes

ASTM A312 TP 321 Seamless Pipes are titanium-stabilized austenitic stainless steel pipes designed for enhanced resistance to intergranular corrosion after welding or exposure to high temperatures. Manufactured without welded joints, these pipes provide excellent strength and structural reliability.

Grade 321 contains titanium, which stabilizes the material against chromium carbide formation, making it suitable for elevated temperature applications and continuous service conditions.

Specifications

Standard	ASTM A312 / ASME SA312
Grade	TP 321
Manufacturing Process	Hot Rolled / Cold Drawn Seamless
Size Range	1/8" NB to 24" NB
Wall Thickness	Schedule 5S to Schedule XXS
Length	6 Meters Standard / Custom Length
Surface Finish	Annealed & Pickled, Polished, Bright Finish
End Type	Plain End, Beveled End, Threaded

Key Benefits

• Stabilized Against Intergranular Corrosion: Titanium prevents carbide precipitation.
• High-Temperature Resistance: Suitable for continuous elevated temperature service.
• Excellent Weldability: Maintains strength and corrosion resistance after welding.
• Good Oxidation Resistance: Performs well in heat-exposed environments.
• Strong Mechanical Properties: Seamless construction ensures pressure handling capability.

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

Applications

• Heat Exchangers
• Boilers and Pressure Vessels
• Petrochemical Industry
• Oil & Gas Industry
• Power Generation Plants
• High-Temperature Piping Systems

Quality Testing

• Hydrostatic Testing
• Ultrasonic Testing (UT)
• Radiographic Testing (RT)
• PMI Testing
• Dimensional Inspection

Conclusion

ASTM A312 TP 321 Seamless Pipes provide excellent resistance to intergranular corrosion and superior performance in high-temperature environments. Their titanium-stabilized composition and seamless structure make them a reliable choice for critical industrial piping applications.