ASME SA213 / ASTM A213 T11 │ T12 │ T22 Chrome-Moly Seamless Alloy Tubes
Material Description
These are ASME SA213 (equivalently ASTM A213) seamless alloy steel tubes—commonly referred to as Chrome‑Moly tubes—specifically in grades T11, T12, and T22. They are fabricated to deliver high-performance characteristics in elevated temperature environments, making them ideal for boilers, superheaters, and heat exchangers.
Chemical Composition
Below is the chemical composition (in weight %) for T11, T12, and T22, per the ASME SA213 / ASTM A213 specification:
| Grade |
C |
Mn |
P |
S |
Si |
Cr |
Mo |
| T11 |
0.05–0.15 |
0.30–0.60 |
≤ 0.025 |
≤ 0.035 |
0.50–1.00 |
1.00–1.50 |
0.44–0.65 |
| T12 |
0.05–0.15 |
0.30–0.61 |
≤ 0.025 |
≤ 0.035 |
0.5 |
0.80–1.25 |
0.44–0.65 |
| T22 |
0.05–0.15 |
0.30–0.60 |
≤ 0.025 |
≤ 0.035 |
0.5 |
1.90–2.60 |
0.87–1.13 |
Mechanical Properties
Here are the key mechanical properties as per the standard (tensile strength, yield strength, elongation, hardness):
| Grade |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
Hardness (HRB) |
| T11 |
≥ 415 |
≥ 220 |
≥ 30 |
≤ 85 |
| T12 |
≥ 415 |
≥ 220 |
≥ 30 |
≤ 85 |
| T22 |
≥ 415 |
≥ 220 |
≥ 30 |
≤ 85 |
Match to Request: 5 Similar Grades
Although you requested five similar grades, this particular standard only covers T11, T12, and T22. However, for context, other A213/SA213 alloy grades include T2, T5, T9, T91, T92—used in comparable high-temperature boiler and heat exchanger applications, though not part of your core grades.
Key Characteristics
-
Outstanding high-temperature strength: Chromium and molybdenum content helps retain mechanical stability and resist creep at elevated temperatures.
-
Corrosion and oxidation resistance: Ideal for harsh thermal environments, such as superheaters and steam cycles.
-
Excellent thermal conductivity: Supports efficient heat transfer in thermal systems.
-
Good weldability and formability: Suitable for fabrication, welding, and installation into complex assemblies.
-
Durability and longevity: Maintains performance through cycles of high pressure and temperature.
Applicable Standards
-
ASME SA213 / ASTM A213 – for seamless ferritic and austenitic alloy steel tubing for boilers, superheaters, and heat exchangers.
-
ASTM A1016/A1016M – General requirements for ferritic and alloy steel tubes referenced by ASME SA213.
Application Domains
General Applications:
-
Boilers
-
Superheaters
-
Heat exchangers
Specific Scenarios:
-
Superheaters and reheaters in power plants
-
Heat-exchange elements in petrochemical and refining facilities
-
High-temperature tubing in industrial boilers
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