ASTM A213 T22 2.25Cr-1Mo Steel Seamless tube FOR BOILER AND HEAT EXCHANGER SEAMLESS TUBES (STBA 24)

ASTM A213 T22 2.25Cr-1Mo Steel Seamless tube FOR BOILER AND HEAT EXCHANGER SEAMLESS TUBES (STBA 24) Product Information -:- For detailed product information, please contact sales. -: ASTM A213 T22 2.25Cr-1Mo Steel Seamless tube FOR BOILER AND HEAT EXCHANGER SEAMLESS TUBES (STBA 24) Synonyms -:- For detailed product information, please contact sales. -:

ASTM A213 T22 2.25Cr-1Mo STEEL FOR BOILER AND HEAT EXCHANGER SEAMLESS TUBES (STBA 24) Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A213 T22 / 2.25Cr-1Mo Alloy Steel Tube (STBA 24)** **Product Overview** ASTM A213 T22, commercially known as **2.25Cr-1Mo** steel, is a high-performance **chromium-molybdenum (Cr-Mo) low-alloy steel** specifically formulated for seamless tubes in the most demanding **high-temperature and high-pressure service**. Recognized as a workhorse alloy for advanced power generation and petrochemical processing, it offers an exceptional balance of **creep strength, oxidation resistance, microstructural stability, and resistance to hydrogen attack**. With a nominal composition of 2.25% chromium and 1% molybdenum, it provides superior performance to lower Cr-Mo grades (T11, T12) in superheater/reheater sections and refinery heater tubes. Its Japanese Industrial Standard (JIS) designation is **STBA 24**. **Key International Standards** * **Primary Standard:** **ASTM A213 / A213M** - Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes. * **Governing Specification:** This product conforms to the requirements for **Grade T22** within ASTM A213. * **ASME Designation:** **SA-213 T22** - The mandatory ASME Boiler and Pressure Vessel Code (BPVC) designation. * **Commercial/Alternate Designations:** * **2.25Cr-1Mo** (Common industry name) * **JIS G 3462 STBA 24** (Japanese Standard for alloy steel boiler and heat exchanger tubes) * **DIN 17175 10CrMo9-10** * **EN 10216-2 10CrMo9-10** * **Heat Treatment:** Supplied in the **annealed, normalized and tempered, or full-annealed** condition to ensure optimal ductility, toughness, and stability for subsequent fabrication and service. **Chemical Composition (Weight % - ASTM A213 T22 Requirements)** | Element | ASTM A213 T22 Requirement | Typical Range / Aim (STBA 24) | | :--- | :--- | :--- | | **Carbon (C)** | 0.05 - 0.15% | 0.08 - 0.12% | | **Manganese (Mn)** | 0.30 - 0.60% | 0.40 - 0.60% | | **Phosphorus (P)** | 0.025% max | ≤ 0.020% | | **Sulfur (S)** | 0.025% max | ≤ 0.015% | | **Silicon (Si)** | 0.50% max | 0.25 - 0.50% | | **Chromium (Cr)** | **1.90 - 2.60%** | 2.00 - 2.30% | | **Molybdenum (Mo)** | **0.87 - 1.13%** | 0.90 - 1.05% | | **Carbon Equivalent (C.E. IIW)** | -- | Typically 0.45 - 0.55 | **Physical & Mechanical Properties (Room Temperature)** | Property | Requirement (ASTM A213 T22) | Typical Performance / Notes | | :--- | :--- | :--- | | **Tensile Strength** | 60 ksi (415 MPa) min | 65 - 85 ksi (448 - 586 MPa) | | **Yield Strength (0.2% Offset)** | 30 ksi (205 MPa) min | 35 - 50 ksi (241 - 345 MPa) | | **Elongation in 2" (Min)** | 30% | 30 - 35% | | **Hardness (Approx., HB)** | -- | ~140-190 HB | | **Maximum Recommended Continuous Metal Temperature** | -- | **Up to ~1150°F (621°C)**. The higher Cr content provides excellent oxidation resistance, and the Mo provides superior creep strength, making it suitable for the hottest sections of fossil-fired boilers and high-severity process heaters. | | **Key Feature** | **Optimized High-Temperature Alloy:** Represents the optimal balance of chromium (for oxidation/H₂ resistance) and molybdenum (for creep strength) in a widely used, cost-effective ferritic alloy tube, enabling efficient operation at the upper limits of steam conditions for many decades. | **Product Applications** ASTM A213 T22 / STBA 24 tubes are specified for the most severe high-temperature heat transfer services. * **Superheater & Reheater Tubes:** Final-stage, highest-temperature sections in utility and industrial power boilers. * **Process Heater Tubes:** Radiant tubes in refinery heaters (e.g., coker, crude, vacuum, reformer heaters) where resistance to high-temperature hydrogen attack (HTHA) and creep is paramount. * **Heat Exchanger Tubes:** In high-temperature, high-pressure exchangers in petrochemical and refining services, such as hydroprocessing units. * **Steam Piping & Headers** for high-temperature steam lines. * **Catalytic Reformer & Hydroprocessor Piping/Transfer Lines.** **Advantages & Fabrication Notes** * **Demanding Welding & Heat Treatment:** Welding T22 requires the highest level of procedure control among common Cr-Mo grades due to its higher alloy content and susceptibility to reheat cracking. * **Preheat:** Mandatory, typically **450-550°F (232-288°C)** or higher. * **Low-Hydrogen Practice:** Essential (e.g., E9018-B3/B3L electrodes for SMAW). * **Post-Weld Heat Treatment (PWHT):** **Always required.** Standard range is **1250-1350°F (677-732°C)**. **Extremely slow cooling (often ≤ 100°F/hr / 56°C/hr) through the 1200-800°F (649-427°C) range is critical to prevent reheat cracking.** * **Superior HTHA and Oxidation Resistance:** The 2.25% Cr content provides excellent resistance to hydrogen attack per API RP 941 and forms a highly protective, stable oxide scale. * **Excellent Creep Strength:** The 1% Mo content provides outstanding long-term creep rupture strength, allowing for higher design stresses at elevated temperatures. * **Formability:** Good hot formability. Cold bending requires caution and subsequent PWHT. * **Code Compliance:** Fully recognized in the **ASME BPVC, Section I** and **Section VIII**, with published allowable stresses up to 1150°F (621°C). **Disclaimer:** This datasheet provides general information on **ASTM A213 T22 (2.25Cr-1Mo) / STBA 24** alloy steel tubes. For procurement, specify the complete standard, grade (T22), and required condition. **Design must be based on ASME BPVC allowable stress values.** Welding and PWHT of T22 are specialized operations; WPS/PQR per ASME Section IX is mandatory and should be developed with expert consultation. **Reheat cracking is a major, well-documented risk;** uncontrolled cooling after PWHT can lead to catastrophic failure. For hydrogen service, a **formal HTHA assessment per API RP 941 is required**. Material selection, fabrication, and inspection must be overseen by qualified personnel with specific experience in 2.25Cr-1Mo steels. Always adhere to the tube manufacturer's recommendations and applicable construction codes. -:- For detailed product information, please contact sales. -: ASTM A213 T22 2.25Cr-1Mo STEEL FOR BOILER AND HEAT EXCHANGER SEAMLESS TUBES (STBA 24) Specification Dimensions Size： Diameter 20-1000 mm Length <4704 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: ASTM A213 T22 2.25Cr-1Mo STEEL FOR BOILER AND HEAT EXCHANGER SEAMLESS TUBES (STBA 24) Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A213 T22 2.25Cr-1Mo Steel Seamless tube FOR BOILER AND HEAT EXCHANGER SEAMLESS TUBES (STBA 24) -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A213 T22 2.25Cr-1Mo Steel Seamless tube FOR BOILER AND HEAT EXCHANGER SEAMLESS TUBES (STBA 24) -:- For detailed product information, please contact sales. -:

Packing of ASTM A213 T22 2.25Cr-1Mo Steel Seamless tube FOR BOILER AND HEAT EXCHANGER SEAMLESS TUBES (STBA 24) -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Seamless tube drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1175 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition