ASTM A213 T11 SEAMLESS TUBES

ASTM A213 T11 SEAMLESS TUBES

ASTM A213 T11 Seamless Tubes are high-temperature chromium-molybdenum alloy steel tubes manufactured in accordance with ASTM A213 / ASME SA213 standards. These tubes are primarily designed for boiler, superheater, and heat exchanger applications operating under high pressure and elevated temperature conditions.

Grade T11 is a 1.25% Chromium – 0.5% Molybdenum (Cr-Mo) alloy steel offering excellent strength, oxidation resistance, and creep resistance at elevated temperatures. The seamless manufacturing process ensures uniform structure, superior pressure handling capability, and enhanced reliability in critical thermal service applications.

Specifications of ASTM A213 T11 Seamless Tubes

Standard	ASTM A213 / ASME SA213
Grade	T11
Material Type	Alloy Steel (1.25Cr – 0.5Mo)
Manufacturing Process	Seamless (Hot Finished / Cold Drawn)
Size Range	1/8" OD to 5" OD (Custom Sizes Available)
Wall Thickness	As per ASTM A213 Specification
Length	Single Random / Cut Length / U-Bend Tubes Available
Surface Finish	Annealed & Pickled / Black Finish
End Types	Plain End (PE) / Beveled End (On Request)

Key Benefits

• High Temperature Strength: Suitable for continuous service in elevated temperature environments.
• Good Creep Resistance: Maintains structural integrity during long-term heat exposure.
• Oxidation & Scaling Resistance: Chromium improves resistance to high-temperature corrosion.
• Excellent Pressure Handling: Designed for boiler and heat exchanger systems.
• Seamless Construction: Ensures uniform strength without weld defects.
• Reliable Thermal Performance: Ideal for critical heat transfer applications.

Chemical Composition (Typical)

Element	Composition (%)
Carbon (C)	0.05 – 0.15
Chromium (Cr)	1.00 – 1.50
Molybdenum (Mo)	0.44 – 0.65
Manganese (Mn)	0.30 – 0.60
Silicon (Si)	0.50 – 1.00

Applications

• Boiler Tubes
• Superheater & Reheater Tubes
• Heat Exchangers
• Power Plant Equipment
• Petrochemical Processing Units
• High-Temperature Steam Service

Quality Assurance

• Chemical Analysis: Verification of alloy composition.
• Mechanical Testing: Tensile and hardness testing.
• Hydrostatic or NDT Testing: Ensures leak-proof performance.
• Ultrasonic Testing (UT): Detection of internal defects.
• Dimensional Inspection: OD and wall thickness verification.
• Mill Test Certificates (MTC): Supplied with each batch.

Conclusion

ASTM A213 T11 Seamless Tubes offer excellent high-temperature strength, oxidation resistance, and dependable performance in boiler and heat transfer applications. With their 1.25Cr–0.5Mo alloy composition and seamless construction, these tubes are widely used in power generation and petrochemical industries requiring safe and efficient thermal systems.