ASME SA213 T22 Alloy Steel Boiler Tube
ASME SA213 T22 Alloy Steel Boiler Tube: Complete Material Data and Global Equivalents
Explore the authoritative data sheet for ASME SA213 T22 seamless ferritic alloy steel boiler tube, including chemical composition, mechanical properties, thermal conductivity, and international equivalent standards such as 10CrMo9-10 and STBA24, ideal for high-temperature applications.
Hot finished or cold finished, followed by normalizing and tempering. Cold working may require subsequent heat treatment.
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ASME SA213 T22 Alloy Steel Boiler Tube Introduction
ASME SA213 T22 is a seamless ferritic alloy steel tube with a nominal composition of 2.25% chromium and 1% molybdenum, specifically designed for high-temperature service in boilers, superheaters, and heat exchangers. This grade exhibits excellent creep strength, oxidation resistance, and weldability, making it suitable for prolonged operation at temperatures up to approximately 580°C. It is supplied in the normalized and tempered condition to achieve a balanced microstructure of bainite or ferrite-pearlite, ensuring stable mechanical properties under cyclic thermal loads. The material conforms to the rigorous chemical and mechanical requirements of ASME SA213/SA213M, which is harmonized with ASTM A213. T22 steel is widely used in power generation, petrochemical refining, and industrial processing where reliable high-temperature performance is critical. Its combination of moderate alloy content, good fabricability, and long-term durability positions it as a cost-effective solution for superheater and reheater tubing.
ASME SA213 T22 Alloy Steel Boiler Tube Chemical Composition
The chemical composition conforms to ASME SA213 T22, which is a 2.25Cr-1Mo nominal analysis. The specified elements ensure adequate hardenability, high-temperature strength, and oxidation resistance. Residual elements such as phosphorus and sulfur are tightly controlled to enhance weldability and prevent hot cracking.Key alloying effects:
- Chromium (Cr) 1.90–2.60%: Provides oxidation and corrosion resistance, increases high-temperature strength.
- Molybdenum (Mo) 0.87–1.13%: Contributes to elevated temperature creep strength by solid solution strengthening and carbide stabilization.
- Carbon (C) 0.05–0.15%: Maintains ductility while promoting hardenability during heat treatment.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | 0.05–0.15 | Per heat analysis |
| Manganese (Mn) | 0.30–0.60 | — |
| Phosphorus (P) | ≤ 0.025 | — |
| Sulfur (S) | ≤ 0.025 | — |
| Silicon (Si) | 0.25–1.00 | — |
| Chromium (Cr) | 1.90–2.60 | — |
| Molybdenum (Mo) | 0.87–1.13 | — |
| Other Elements (Nickel, Copper, etc.) | Not specified (trace) | Unless otherwise agreed, residuals are typically <0.30% Ni and <0.30% Cu |
ASME SA213 T22 Alloy Steel Boiler Tube Thermal and Electrical Physical Properties
Physical properties of SA213 T22 are representative of 2.25Cr-1Mo steel in the normalized and tempered condition. These values are temperature-dependent and are provided for engineering design calculations. Thermal conductivity and expansion data are critical for thermal stress analysis in boiler tube applications. Disclaimer: The figures are typical values gathered from published literature; they are not specification requirements but serve as reliable design data.
| Property | Standard Value (Typical) | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.83 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 207 | GPa | At 20°C |
| Shear Modulus (G) | 79.9 | GPa | Calculated from E and Poisson's ratio |
| Poisson's Ratio (ν) | 0.30 | — | Room temperature |
| Thermal Expansion Coefficient (α) | 11.0 | ×10⁻⁶/K | 20–100°C |
| Thermal Expansion Coefficient (α) | 12.0 | ×10⁻⁶/K | 20–300°C |
| Thermal Expansion Coefficient (α) | 13.0 | ×10⁻⁶/K | 20–500°C |
| Thermal Conductivity (λ) | 42.0 | W/(m·K) | At 100°C |
| Thermal Conductivity (λ) | 38.0 | W/(m·K) | At 300°C |
| Thermal Conductivity (λ) | 34.0 | W/(m·K) | At 500°C |
| Specific Heat Capacity | 460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρe) | 0.35 | µΩ·m | At 20°C |
ASME SA213 T22 Alloy Steel Boiler Tube Mechanical Properties
Mechanical properties are determined on longitudinal test specimens in accordance with ASME SA213. The steel must meet minimum tensile and yield strength requirements while maintaining adequate ductility. Values shown are for tubes in the normalized and tempered condition. Hardness limits apply only when required by the purchaser. Testing conditions: All tensile tests are conducted at room temperature, usually on full-section or strip specimens. Elongation is measured in 2 in. (50 mm) gauge length.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥ 415 | MPa | Room temperature, ASTM A370 |
| Yield Strength (ReH, 0.2% offset) | ≥ 205 | MPa | Room temperature, ASTM A370 |
| Elongation (A) in 2 in. (50 mm) | ≥ 30 | % | Longitudinal specimen, gauge length 50 mm; for wall thickness <7.94 mm, minimum 28%; for heavy walls, values may vary per standard |
| Hardness | ≤ 85 HRB or ≤ 163 HBW (typical) | — | Rockwell or Brinell, when specified by purchaser |
ASME SA213 T22 Alloy Steel Boiler Tube Exact Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe (EN) | EN 10216-2 | 10CrMo9-10 | Seamless steel tubes for pressure purposes; technically identical composition and mechanical properties. |
| Japan | JIS G3462 | STBA24 | Alloy steel boiler and heat exchanger tubes; chemical composition closely matches T22. |
| China | GB/T 5310 | 12Cr2MoG | Seamless steel tubes for high-pressure boilers; equivalent to T22. |
| ISO | ISO 2604-2 | 10CrMo9-10 | International standard; interchangeable with EN grade. |
| Russia | GOST 550-75 | 12Ch2M (12Х2М) | Approximate equivalent; check specific standard for full compliance. |
| India | IS 3602 | Grade 22 | Boiler and superheater tubes; traceable to ASME SA213 T22 requirements. |
ASME SA213 T22 Alloy Steel Boiler Tube Application Introduction
ASME SA213 T22 is engineered for high-temperature, high-pressure environments where long-term creep strength and oxidation resistance are mandatory. Its microstructure stability up to ~580°C makes it ideal for steam-carrying components in thermal power plants and for refinery heater tubes. The steel can be cold bent, swaged, and welded following qualified procedures (typically preheat and post-weld heat treatment are required). Its cost-effectiveness and reliability have made it the workhorse of modern boiler design.
Product Applications: Boiler superheater and reheater tube bundles, Heat exchanger U-tubes and straight tubes, Catalytic reformer furnace tubes, High-pressure steam piping (when fabricated from T22 tube material), Water wall tubes in circulating fluidized bed (CFB) boilers
Processed into products: Superheater and reheater tube panels, Boiler header connections and stubs, Tube-to-tube butt welds in membrane walls, Tube supports and hanger rods, Thermowell assemblies, High-temperature thermocouple protection tubes
Application industries: Conventional and combined-cycle power generation, Petrochemical refineries (e.g., hydrocrackers, reformers), Oil & gas processing plants, Chemical industry (ammonia, methanol synthesis), Waste-to-energy and biomass power plants
ASME SA213 T22 Alloy Steel Boiler Tube Similar or Comparable Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A335 | P22 | Seamless ferritic alloy steel pipe for high-temperature service; similar Cr-Mo composition, but product form is pipe, not tube. Mechanical properties comparable; use for large-diameter piping. |
| USA | ASTM A387 | Grade 22 Class 2 | Alloy steel plate for pressure vessels; similar chemical composition but intended for plate products. Weld metal compatibility with T22. |
| Europe | EN 10028-2 | 10CrMo9-10 | Flat products for pressure purposes; analogous chemistry, suitable for vessel shells where T22 tube connectors are used. |
| Japan | JIS G3203 | SFVAF22 | Alloy steel forgings for pressure vessels; similar composition, often used for tube sheets and headers joined to T22 tubing. |
Notes:
Welding considerations: T22 requires pre-heat temperatures of 200–300°C and post-weld heat treatment (PWHT) at 675–730°C to ensure stress relief and formation of stable carbides. Inspection: Hydrostatic testing and non-destructive examination (e.g., eddy current or ultrasonic) are common per ASTM A450/A450M. Ordering information: Specify ASME SA213 T22, outside diameter, minimum wall thickness, length, and any supplementary requirements (e.g., S1 through S6) such as product analysis, flattening test, or mandatory hardness checks.
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