ASTM A213 T5 5Cr-0.5Mo Steel Seamless tube TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 25)

ASTM A213 T5 5Cr-0.5Mo Steel Seamless tube TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 25) Product Information -:- For detailed product information, please contact sales. -: ASTM A213 T5 5Cr-0.5Mo Steel Seamless tube TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 25) Synonyms -:- For detailed product information, please contact sales. -:

ASTM A213 T5 5Cr-0.5Mo STEEL TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 25) Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A213 T5 / 5Cr-0.5Mo Alloy Steel Tube (STBA 25)** **Product Overview** ASTM A213 T5, commercially known as **5Cr-0.5Mo** steel, is a **medium-chromium alloy steel** seamless tube specifically engineered for service in highly **oxidizing and sulfidizing atmospheres** at elevated temperatures. With a nominal composition of 5% chromium and 0.5% molybdenum, this grade bridges the performance gap between the lower Cr-Mo steels (T22, 2.25Cr-1Mo) and the higher chromium, ferritic stainless steels. Its primary advantage is significantly improved **resistance to oxidation, hot corrosion (sulfidation), and steam-side exfoliation** compared to T22, while maintaining better thermal conductivity and lower thermal expansion than austenitic stainless steels. It is a critical material for superheater and reheater sections in boilers burning corrosive fuels and for process heater tubes in severe refinery service. Its Japanese Industrial Standard (JIS) designation is **STBA 25**. **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 T5** within ASTM A213. * **ASME Designation:** **SA-213 T5** - The mandatory ASME Boiler and Pressure Vessel Code (BPVC) designation. * **Commercial/Alternate Designations:** * **5Cr-0.5Mo** (Common industry name) * **JIS G 3462 STBA 25** (Japanese Standard) * **DIN 17175 12CrMo195** * **Heat Treatment:** Supplied in the **annealed or normalized and tempered** condition to ensure a soft, ductile, and stable microstructure. **Chemical Composition (Weight % - ASTM A213 T5 Requirements)** | Element | ASTM A213 T5 Requirement | Typical Range / Aim (STBA 25) | | :--- | :--- | :--- | | **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)** | 0.50% max | 0.25 - 0.50% | | **Chromium (Cr)** | **4.00 - 6.00%** | 4.50 - 5.50% | | **Molybdenum (Mo)** | **0.45 - 0.65%** | 0.45 - 0.60% | | **Carbon Equivalent (C.E. IIW)** | -- | Typically 0.50 - 0.60 | **Physical & Mechanical Properties (Room Temperature)** | Property | Requirement (ASTM A213 T5) | 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)** | -- | ~150-200 HB | | **Maximum Recommended Metal Temperature** | -- | **Up to ~1200°F (649°C)** for prolonged service. The 5% Cr provides a step-change in oxidation and corrosion resistance, making it suitable for environments where T22 would suffer excessive scaling or sulfidation. | | **Key Feature** | **Corrosion-Resistant Elevated Temperature Alloy:** Provides a cost-effective solution for high-temperature tubing in corrosive environments where austenitic stainless steels are over-specified or problematic due to stress corrosion cracking (SCC) or thermal expansion issues. | **Product Applications** ASTM A213 T5 / STBA 25 tubes are specified for heat transfer services where high-temperature corrosion is the primary life-limiting factor. * **Superheater & Reheater Tubes:** In boilers firing **high-sulfur coal**, **biomass**, **waste**, or **heavy oil** where sulfidation and oxidation are accelerated. * **Process Heater Tubes:** In refinery heaters processing **high-sulfur crudes** or where combustion gases are corrosive (e.g., coker heaters, vacuum heaters). * **Catalytic Reformer Heater Tubes:** Where both high temperature and some sulfur resistance are required. * **Steam Methane Reformer (SMR) Tubes:** For certain sections exposed to less severe process conditions. * **Heat Exchanger Tubes** in high-temperature corrosive gas services. **Advantages & Fabrication Notes** * **Challenging Welding Requirements:** The higher chromium content increases hardenability and the risk of cold cracking. Welding requires strict procedure control. * **Preheat:** Mandatory, typically **400-550°F (204-288°C)**. * **Low-Hydrogen Practice:** Essential. Matching filler metals (e.g., AWS ER502, E502-XX) are used. * **Post-Weld Heat Treatment (PWHT):** **Always required.** Standard range is **1350-1450°F (732-788°C)**. **Slow cooling is necessary to prevent excessive hardening and cracking.** * **Superior Oxidation & Sulfidation Resistance:** The ~5% Cr content forms a dense, chromium-rich oxide scale that is much more protective against both oxygen and sulfur penetration than scales formed on lower-chromium steels. * **Good Creep Strength:** The molybdenum addition provides reasonable creep resistance, though generally lower than that of T22 (2.25Cr-1Mo) at very high stress levels. * **Thermal Fatigue Resistance:** Its thermal expansion coefficient is closer to that of carbon steel than austenitic stainless steels, reducing thermal stress in systems with temperature cycling. * **Code Compliance:** Fully recognized in the **ASME BPVC, Section I** and **Section VIII**, with published allowable stresses up to 1200°F (649°C). **Disclaimer:** This datasheet provides general information on **ASTM A213 T5 (5Cr-0.5Mo) / STBA 25** alloy steel tubes. For procurement, specify the complete standard and grade (T5). **Design must be based on ASME BPVC allowable stress values.** Welding and PWHT require qualified procedures per ASME Section IX. Due to its air-hardening tendency, uncontrolled cooling after welding or PWHT can lead to brittle, crack-prone structures. Material selection should be based on a detailed analysis of the service environment (fuel/process gas composition, metal temperature). It is not a direct replacement for T22 in high-stress creep applications but is superior in corrosive atmospheres. Fabrication should be overseen by personnel experienced with medium-chromium alloy steels. -:- For detailed product information, please contact sales. -: ASTM A213 T5 5Cr-0.5Mo STEEL TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 25) Specification Dimensions Size： Diameter 20-1000 mm Length <4707 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 T5 5Cr-0.5Mo STEEL TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 25) Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A213 T5 5Cr-0.5Mo Steel Seamless tube TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 25) -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A213 T5 5Cr-0.5Mo Steel Seamless tube TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 25) -:- For detailed product information, please contact sales. -:

Packing of ASTM A213 T5 5Cr-0.5Mo Steel Seamless tube TUBES FOR BOILERS AND HEAT EXCHANGERS (STBA 25) -:- 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 1178 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