ASTM A213 T11 Cr-Mo Alloy Seamless Tube for 580°C+ High-Temperature & High-Pressure Boiler and Heat Exchanger
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ASTM A213 T11 Cr-Mo Alloy Seamless Tube for 580°C+ High-Temperature & High-Pressure Boiler and Heat Exchanger
ASTM A213 T11 is a chromium-molybdenum (Cr-Mo) low-alloy ferritic seamless steel tube, with the nominal composition of 1.25Cr-0.5Mo-Si. It is in minimum wall thickness or, if specified in the order, average wall thickness. T11 alloy steel offers good weldability, requiring preheating to 300°C prior to welding and post-weld stress relief treatment. The product is widely utilized in high-pressure, ultra-high-pressure, and subcritical power station boiler superheaters, reheaters, headers, and main steam pipelines, as well as nuclear power heat exchangers and petrochemical cracking unit furnace tubes.
| ASTM / ASME | UNS | JIS | EN | GB | DIN |
| T11 | K11597 | STBA23 | 10CrMo5-5 | 12Cr1MoV | 1.7338 |
Chemical & Mechanical Properties
| ASTM A213 T5 Chemical Composition (%) | ||||||
| C | Mn | P | S | Si | Cr | Mo |
|
0.05-0.15 |
0.30-0.60 | ≤0.025 |
≤0.025 |
0.50-1.00 |
1.0-1.50 |
0.44~0.65 |
Mechanical Properties
| Tensile Strength |
Yield Strength (0.2% offset) |
Elongation |
Hardness |
|
|
Brinell/Vickers
|
Rockwell
|
|||
| ≥415 MPa (60 ksi) | ≥205 MPa (30 ksi) | ≥30% | ≤163 HBW / 170 HV | 85 HRB |
*Heat treatment
The ASTM A213 T11 seamless tubes shall be made by the hot-rolling or cold-drawn seamless process. The tubes may be furnished in two heat treated conditions: full or isothermal annealed; or normalized and tempered (N+T). Especially, if N+T is adopted, the tempering temperature shall be no less than 650°C [1200°F].
Tolerance
| Outside Diameter | OD Tolerance | WT Tolerance | Ovality Tolerance | Cut Length Tolerance |
| OD≤ 12, 7 mm | ± 0, 13 mm | ± 15 % | – | + 3, 18 mm, – 0 mm |
| 12, 7 mm < OD ≤ 38, 1 mm | ± 0, 13 mm | ± 10 % | max, 1, 65 mm | + 3, 18 mm, – 0 mm |
| 38, 1 mm < OD ≤ 88, 9 mm | ± 0, 25 mm | ± 10 % | max, 2, 41 mm | + 4, 76 mm, – 0 mm |
*Permissible variations from the specified minimum wall thickness shall be in accordance with Specification A1016/A1016M.
Key Adventages
- High Strength: Superior tensile and yield strength for high-stress conditions.
- Thermal Stability: Handles rapid temperature changes, reducing thermal fatigue risks.
- Seamless Design: Provides improved strength and reliability, reducing the risk of leaks and failures.
- Corrosion Resistance: Enhanced resistance to oxidation and corrosion for extended life in aggressive environments.
Key Applications
- Power Plants: Widely used in boilers and heat exchangers for steam generation.
- Oil and Gas Industry: Utilized in pipelines and process equipment operating under high-pressure conditions.
- Chemical Processing: Suitable for transferring corrosive substances at elevated temperatures.
- Petrochemical Refineries: Employed in various applications where high strength and corrosion resistance are critical.
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