ASTM A312 TP 321 ERW Pipes

ASTM A312 TP 321 ERW Pipes

ASTM A312 TP 321 ERW Pipes are titanium-stabilized austenitic stainless steel welded pipes designed for high-temperature service and applications where resistance to intergranular corrosion is critical. The addition of titanium prevents carbide precipitation, making Grade 321 ideal for elevated temperature environments.

These pipes are widely used in heat exchangers, boilers, pressure vessels, petrochemical processing, and aerospace applications where thermal stability and long-term corrosion resistance are required.

Specifications

Standard	ASTM A312 / ASME SA312
Grade	TP 321
Manufacturing Process	Electric Resistance Welded (ERW)
Size Range	1/2" NB to 24" NB
Wall Thickness	Schedule 5S to Schedule 80S
Length	6 Meters Standard / Custom Length
Surface Finish	Annealed & Pickled, Polished, Matte Finish
End Type	Plain End, Beveled End, Threaded

Key Benefits

• Titanium Stabilized: Prevents intergranular corrosion after welding.
• Excellent High-Temperature Strength: Performs reliably in elevated temperature environments.
• Improved Oxidation Resistance: Suitable for thermal cycling conditions.
• Good Weldability: Maintains structural integrity without post-weld annealing.
• Long Service Life: Durable performance in demanding industrial applications.

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 – 0.70 Max

Applications

• Heat Exchangers
• Boilers & Pressure Vessels
• Petrochemical Processing
• Refinery Equipment
• Aerospace Components

Quality Testing

• Hydrostatic Testing
• Ultrasonic Testing (UT)
• Eddy Current Testing
• PMI Testing
• Dimensional Inspection

Conclusion

ASTM A312 TP 321 ERW Pipes offer excellent resistance to intergranular corrosion, superior thermal stability, and reliable performance in high-temperature environments, making them ideal for critical industrial and thermal processing applications.