ASTM A213 T9 9Cr-1Mo Steel Wire TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 26)

ASTM A213 T9 9Cr-1Mo Steel Wire TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 26) Product Information -:- For detailed product information, please contact sales. -: ASTM A213 T9 9Cr-1Mo Steel Wire TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 26) Synonyms -:- For detailed product information, please contact sales. -:

ASTM A213 T9 9Cr-1Mo STEEL TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 26) Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A213 T9 / 9Cr-1Mo Alloy Steel Tube (STBA 26)** **Product Overview** ASTM A213 T9, commercially designated as **9Cr-1Mo** steel, is a **high-chromium ferritic/martensitic alloy steel** seamless tube engineered for **ultra-high temperature service** in aggressive environments. With a nominal composition of 9% chromium and 1% molybdenum, this grade represents a major advancement in elevated temperature performance, offering exceptional **creep strength, oxidation resistance, and microstructural stability** at temperatures up to 1200°F (650°C). It bridges the gap between conventional low-alloy steels and austenitic stainless steels, providing superior thermal fatigue resistance and lower thermal expansion than austenitics. T9 is a critical material for advanced superheater/reheater sections in high-efficiency power plants and for high-severity process heater tubes. Its Japanese Industrial Standard (JIS) designation is **STBA 26**. **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 T9** within ASTM A213. * **ASME Designation:** **SA-213 T9** - The mandatory ASME Boiler and Pressure Vessel Code (BPVC) designation. * **Commercial/Alternate Designations:** * **9Cr-1Mo** (Common industry name) * **JIS G 3462 STBA 26** (Japanese Standard) * **DIN 17175 X12CrMo9-1** * **EN 10216-2 X11CrMo9-1** * **Heat Treatment:** Supplied in the **normalized and tempered** condition to develop a fine, tempered martensitic microstructure, which is essential for its high-temperature properties. **Chemical Composition (Weight % - ASTM A213 T9 Requirements)** | Element | ASTM A213 T9 Requirement | Typical Range / Aim (STBA 26) | | :--- | :--- | :--- | | **Carbon (C)** | 0.15% max | 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)** | 0.25 - 1.00% | 0.50 - 0.80% | | **Chromium (Cr)** | **8.00 - 10.00%** | 8.50 - 9.50% | | **Molybdenum (Mo)** | **0.90 - 1.10%** | 0.95 - 1.05% | | **Carbon Equivalent (C.E. IIW)** | -- | Typically 0.55 - 0.65 | **Physical & Mechanical Properties (Room Temperature)** | Property | Requirement (ASTM A213 T9) | Typical Performance / Notes | | :--- | :--- | :--- | | **Tensile Strength** | 60 ksi (415 MPa) min | 75 - 95 ksi (517 - 655 MPa) | | **Yield Strength (0.2% Offset)** | 30 ksi (205 MPa) min | 45 - 60 ksi (310 - 414 MPa) | | **Elongation in 2" (Min)** | 30% | 25 - 30% | | **Hardness (Approx., HB)** | -- | ~180-230 HB | | **Maximum Recommended Metal Temperature** | -- | **Up to ~1200°F (650°C)** for prolonged service. The high chromium content provides outstanding oxidation and hot corrosion resistance, while the martensitic structure offers excellent creep strength. | | **Key Feature** | **High-Temperature Martensitic Alloy:** Combines the oxidation resistance of a high-chromium steel with the thermal conductivity and low thermal expansion of a ferritic/martensitic alloy, making it ideal for advanced high-temperature heat exchangers and boilers where thermal cycling is a concern. | **Product Applications** ASTM A213 T9 / STBA 26 tubes are specified for the most severe high-temperature services in power and process industries. * **Superheater & Reheater Tubes:** Final-stage, highest-temperature sections in **advanced supercritical and ultra-supercritical (USC) coal-fired boilers**. * **Process Heater Tubes:** Radiant and convection tubes in high-temperature refinery heaters (e.g., ethylene cracking furnaces, reformer heaters). * **Heat Exchanger Tubes:** For high-temperature gas-to-gas or gas-to-liquid exchangers in syngas, hydrogen, and chemical processing. * **Steam Piping & Headers** for high-temperature steam lines. * **Waste-to-Energy and Biomass Boiler Tubes** where chloride and alkali corrosion are concerns. **Advantages & Fabrication Notes** * **Critical Welding & Heat Treatment:** Welding T9 is a specialized operation due to its high hardenability and martensitic structure. It is prone to cold cracking and requires precise thermal control. * **Preheat:** Mandatory and high, typically **450-600°F (232-316°C)**. * **Low-Hydrogen Practice:** Essential. Matching filler metals (e.g., AWS ER505, E505-XX) are required. * **Post-Weld Heat Treatment (PWHT):** **Always required.** Temperatures are typically **1350-1450°F (732-788°C)**. **Controlled heating and cooling rates are critical** to achieve proper tempering of the martensitic HAZ and base metal without causing excessive grain growth or re-hardening. * **Exceptional Oxidation & Creep Resistance:** The 9% Cr content provides a highly protective, stable oxide layer, offering superior resistance to steam-side oxidation and exfoliation compared to lower alloys. Its creep rupture strength surpasses that of T22 and T91 at temperatures above ~1050°F (566°C). * **Good Thermal Fatigue Resistance:** Lower coefficient of thermal expansion compared to austenitic stainless steels reduces thermal stresses during startup/shutdown cycles. * **Potential for Temper Embrittlement:** Can be susceptible if improperly heat-treated or if residual elements are not controlled. Proper PWHT and chemistry control are essential. * **Code Compliance:** Fully recognized in the **ASME BPVC, Section I** and **Section VIII**, with published allowable stresses up to 1200°F (650°C). **Disclaimer:** This datasheet provides general information on **ASTM A213 T9 (9Cr-1Mo) / STBA 26** alloy steel tubes. For procurement, specify the complete standard and grade (T9). **Design must be based on ASME BPVC allowable stress values.** Welding and PWHT of T9 require expert knowledge; procedures **must be rigorously qualified per ASME Section IX**, often involving advanced techniques like temper bead welding for repairs. The material's high hardenability makes it crack-sensitive; improper handling will lead to failure. Material selection should be validated for the specific service environment, considering both temperature and corrosivity. Fabrication must be overseen by personnel with specialized experience in high-chromium martensitic steels. This material is a precursor to the more advanced **T91/P91 (9Cr-1Mo-V-Nb)** grade, which offers enhanced creep strength. -:- For detailed product information, please contact sales. -: ASTM A213 T9 9Cr-1Mo STEEL TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 26) Specification Dimensions Size： Diameter 20-1000 mm Length <4708 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 T9 9Cr-1Mo STEEL TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 26) Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A213 T9 9Cr-1Mo Steel Wire TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 26) -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A213 T9 9Cr-1Mo Steel Wire TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 26) -:- For detailed product information, please contact sales. -:

Packing of ASTM A213 T9 9Cr-1Mo Steel Wire TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 26) -:- 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 Wire 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 1179 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