ASTM A312 TP 321H ERW Pipes

ASTM A312 TP 321H ERW Pipes

ASTM A312 TP 321H ERW Pipes are titanium-stabilized, high carbon austenitic stainless steel welded pipes specifically designed for elevated temperature and high-pressure service. The higher carbon content in 321H improves creep resistance and enhances strength at temperatures above 500°C.

These pipes are widely used in boilers, heat exchangers, pressure vessels, refinery equipment, and thermal processing systems where high-temperature stability and resistance to intergranular corrosion are essential.

Specifications

Standard	ASTM A312 / ASME SA312
Grade	TP 321H
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

• Enhanced High-Temperature Strength: Higher carbon improves creep resistance.
• Titanium Stabilized: Prevents intergranular corrosion after welding.
• Excellent Oxidation Resistance: Performs reliably in elevated thermal conditions.
• Good Structural Stability: Maintains mechanical properties at high temperatures.
• Long Service Life: Suitable for continuous high-heat operations.

Chemical Composition (Typical)

Element	321H (%)
Carbon	0.04 – 0.10
Chromium	17.0 – 19.0
Nickel	9.0 – 12.0
Titanium	5 x (C+N) Min – 0.70 Max

Applications

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

Quality Testing

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

Conclusion

ASTM A312 TP 321H ERW Pipes offer superior high-temperature strength, excellent resistance to intergranular corrosion, and long-term durability, making them ideal for critical heat-intensive industrial applications.