ASTM A213 TP 347L Seamless Tubes

ASTM A213 TP 347L Seamless Tubes

ASTM A213 TP 347L Seamless Tubes are niobium (columbium)-stabilized low-carbon austenitic stainless steel tubes designed for high-temperature service applications. The low carbon content minimizes carbide precipitation, ensuring superior resistance to intergranular corrosion after welding.

Grade 347L offers excellent oxidation resistance and improved creep strength, making it ideal for continuous service in elevated temperature environments where long-term structural stability is required.

Specifications

Standard	ASTM A213 / ASME SA213
Grade	TP 347L
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

• Low Carbon Content: Reduces risk of intergranular corrosion after welding.
• Niobium Stabilization: Prevents chromium carbide precipitation at high temperatures.
• Excellent High-Temperature Strength: Performs reliably under elevated heat and pressure.
• Good Oxidation Resistance: Suitable for continuous high-temperature service.
• Superior Weldability: Maintains mechanical integrity after fabrication.
• Long-Term Durability: Ideal for boilers, superheaters, and heat exchangers.

Chemical Composition (Typical)

Element	347L (%)
Carbon	0.035 Max
Chromium	17.0 – 19.0
Nickel	9.0 – 13.0
Niobium (Columbium)	10x(C) Min – 1.0 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 347L Seamless Tubes provide excellent resistance to intergranular corrosion, high-temperature strength, and dependable mechanical performance. Their stabilized low-carbon composition makes them a reliable choice for critical heat-intensive industrial applications.