ASTM A312 TP 347H ERW Pipes

ASTM A312 TP 347H ERW Pipes

ASTM A312 TP 347H ERW Pipes are high carbon, niobium (columbium) stabilized austenitic stainless steel welded pipes designed for elevated temperature and high-pressure service. The higher carbon content improves creep strength and enhances performance in long-term thermal exposure conditions.

These pipes are widely used in power generation plants, refineries, petrochemical processing units, and high-temperature industrial systems where superior strength, oxidation resistance, and structural stability are required.

Specifications

Standard	ASTM A312 / ASME SA312
Grade	TP 347H
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 Creep Strength: Higher carbon improves performance at elevated temperatures.
• Niobium Stabilized: Prevents intergranular corrosion after welding.
• Excellent Oxidation Resistance: Suitable for continuous high-heat exposure.
• High Pressure Capability: Maintains structural stability in demanding environments.
• Long Service Life: Reliable performance in thermal and chemical industries.

Chemical Composition (Typical)

Element	347H (%)
Carbon	0.04 – 0.10
Chromium	17.0 – 19.0
Nickel	9.0 – 13.0
Niobium (Columbium)	10 x C Min – 1.0 Max

Applications

• Power Generation Plants
• Boilers & Superheaters
• Petrochemical Processing
• Refinery Equipment
• High-Temperature Pressure Systems

Quality Testing

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

Conclusion

ASTM A312 TP 347H ERW Pipes provide superior high-temperature strength, enhanced creep resistance, and long-term corrosion protection, making them ideal for critical industrial applications requiring durability and reliability.