ASTM A213 / ASME SA213 Grade T11 is a seamless chromium‑molybdenum (Cr‑Mo) low‑alloy steel tube, widely used in high‑temperature and high‑pressure environments such as boilers, superheaters, and heat exchangers.
With a nominal composition of approximately 1.25% chromium and 0.50% molybdenum, T11 offers excellent oxidation resistance, sustained creep strength, and good weldability, making it a cost‑effective choice for many elevated‑temperature applications in power generation, petrochemical processing, and industrial heating systems.
Technical Specifications
1. Chemical Composition (ASTM A213 / ASME SA213)
| Element | Composition (%) |
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Silicon (Si) | 0.50 – 1.00 |
| Chromium (Cr) | 1.00 – 1.50 |
| Molybdenum (Mo) | 0.44 – 0.65 |
2. Mechanical Properties
| Property | Value |
| Tensile Strength, min | 415 MPa (60 ksi) |
| Yield Strength, min | 205 MPa (30 ksi) |
| Elongation (in 2″ or 50 mm), min | 0.3 |
| Hardness (HBW), max | 163 |
| Hardness (HRB), max | 85 |
Equivalent post‑heat‑treatment values may reach tensile strength ≥450 MPa and yield strength ≥220 MPa.
3. Dimensional Range
ASTM A213 T11 tubes are typically furnished in the following dimensions:
| Dimension | Range |
| Inside Diameter (ID) | 3.2 mm – 127 mm (1/8″ – 5″) |
| Outside Diameter (OD) | 12.7 mm – 762 mm (customizable) |
| Wall Thickness (WT) | 0.4 mm – 12.7 mm (0.015″ – 0.500″) |
| Length | 6 – 12 m (standard), or as specified |
Standard tolerance for wall thickness is ±10%. Special sizes can be customized upon request, provided all other ASTM A213 requirements are met.
4. Heat Treatment Requirements
| Grade | UNS Number | Heat Treat Type | Tempering Temp (min) |
| T11 | K11597 | Full/isothermal anneal, or normalize & temper | 650°C (1200°F) |
5.Equivalent Standards and Materials
| UNS | ASTM | EN | DIN | JIS | GB |
|---|---|---|---|---|---|
| K11597 | P11 / A213 T11 | 10CrMo5-5 | 1.7338 | STBA23 | 12Cr1MoV |
Note: T11 refers to tube form under ASTM A213; P11 refers to pipe form under ASTM A335, though chemical compositions are identical for most applications.
Comparison with Other Common Grades :
| Grade | Cr (%) | Mo (%) | Max Service Temp (short‑term) | Typical Applications |
| T11 | 1.00–1.50 | 0.44–0.65 | ~565°C | Moderate‑temp superheaters, economizers, boiler tubes |
| T22 | 1.90–2.60 | 0.87–1.13 | ~593°C | High‑temp superheaters, reheaters |
| T9 | 8.0–10.0 | 0.90–1.10 | ~593°C | High‑corrosion hot services |
T11 vs. T22: T22 offers higher oxidation resistance and creep strength at elevated temperatures but comes at a higher cost. T11 provides a more economical solution for applications below ~550°C.
Applications
ASTM A213 T11 seamless tubes are primarily used in:
Power Generation
Superheater and reheater tubes in power plant boilers; water wall tubes in corrosive fuel service; headers and main steam ducts.
Petrochemical & Refinery
Heat exchanger tubes in refinery and petrochemical plants; high‑temperature heating furnaces.
Chemical Processing
Transfer of corrosive substances at elevated temperatures; process equipment under high‑pressure conditions.
Industrial Boilers & Pressure Vessels
Heat exchange components in industrial boiler systems and pressure vessels.
Nuclear Power Equipment
Suitable for boilers, superheaters, and heat exchangers in nuclear service (with applicable ASME Code compliance).
Export Markets
ASTM A213 T11 seamless tubes are exported worldwide to major industrial markets, including:
North America: USA, Canada
Europe: Germany, UK, Spain, Italy, France
Middle East: Saudi Arabia, Kuwait, Jordan, Oman, UAE, Qatar
Asia Pacific: Singapore, Australia, Japan, South Korea, India
South America: Brazil, Columbia, Argentina;Ecuador;Chile;Peru
Africa: South Africa, Tanzania, Uganda, Algeria, Ghana, Sudan,Nigeria
Other: Israel, Turkey
Many global suppliers export over 150,000 tons of steel pipes annually to more than 150 countries, with T11 being a consistently high‑demand product.
FAQ – Frequently Asked Questions
Q1: What does "T11" stand for?
A: "T" indicates Tube under ASTM A213 (compared to "P" for Pipe under ASTM A335). T11 refers to the specific low‑alloy steel grade with approximately 1.25% chromium and 0.50% molybdenum. The chemical composition is essentially the same as P11 under ASTM A335.
Q2: What is the difference between ASTM A213 T11 and ASTM A335 P11?
A: The chemical composition is identical. The key difference is the product form: A213 applies to tubes (specified by OD and wall thickness) used in boilers and heat exchangers, whereas A335 applies to pipes (specified by NPS and schedule) used for high‑temperature piping systems. T11 tubes typically have tighter dimensional tolerances.
Q3: Can T11 tubes be welded?
A: Yes. T11 has good weldability. Recommended practices:
Preheat to approximately 300°C before welding.
Perform post‑weld stress relief treatment.
Use appropriate filler metals compatible with the Cr‑Mo composition.
Avoid rapid cooling to prevent cold cracking.
Q4: What heat treatment is required for T11?
A: ASTM A213 requires T11 to be supplied in a heat‑treated condition:
Normalizing + Tempering (tempering ≥650°C), OR
Full or isothermal annealing.
Heat treatment must not be combined with thermoforming operations.
Q5: How does T11 compare to carbon steel for high‑temperature service?
A: Under long‑term service at 550°C, T11 alloy tubes demonstrate a strength increase of over 30% compared to standard carbon steel tubes (e.g., Grade 20#). Oxidation and flue‑gas corrosion resistance are significantly enhanced, and the designed service life can be 1.5–2 times that of carbon steel tubes.
Q6: What certifications are available?
A: Typical certifications include:
ISO 9001:2015
ASME BPVC Section II, Part D
EN 10204 Type 3.1 / 3.2 (Mill Test Certificates)
PED 2014/68/EU (for European markets)
API 5L / API 5CT (when specified)
Third‑party inspection by BV, SGS, TUV, or Lloyds upon request.
Q7: What non‑destructive tests (NDT) are performed?
A: Standard tests include:
Ultrasonic Testing (UT) for internal defects.
Eddy Current Testing (ECT) for surface defects.
Hydrostatic Test for pressure integrity.
Flattening and flaring tests for ductility verification
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