ATI Allvac® M-50 Specialty Steel, Heat Treatment: 1107°C (2025°F) Q+T

ATI Allvac® M-50 Specialty Steel, Heat Treatment: 1107°C (2025°F) Q+T Product Information -:- For detailed product information, please contact sales. -: ATI Allvac® M-50 Specialty Steel, Heat Treatment: 1107°C (2025°F) Q+T Synonyms -:- For detailed product information, please contact sales. -:

ATI Allvac® M-50 Specialty Steel, Heat Treatment: 1107°C (2025°F) Q+T Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: ATI Allvac® M-50 High Temperature Bearing Steel (Q+T Condition)** **ATI Allvac® M-50** is a high-carbon, high-chromium molybdenum secondary hardening martensitic stainless steel. It is specifically engineered for demanding applications requiring exceptional high-temperature hardness, wear resistance, and fatigue strength. The **1107°C (2025°F) Quench and Temper (Q+T)** heat treatment process optimizes these properties, making it a premier material for aerospace and high-performance bearing components. #### **1. Key Characteristics & Advantages** * **Excellent High-Temperature Performance:** Maintains high hardness and mechanical strength at operating temperatures up to ~425°C (800°F), surpassing conventional bearing steels like 52100. * **Superior Wear Resistance & Contact Fatigue Life:** Ideal for rolling contact applications under high stress. * **Good Corrosion Resistance:** Offers better corrosion resistance than standard tool steels due to its chromium content, though it is not a fully stainless grade. * **Deep Hardenability:** Air hardening capability minimizes distortion during heat treatment. * **Secondary Hardening:** Achieves peak hardness after tempering due to the formation of fine alloy carbides. #### **2. Standard Specifications & International Designations** * **UNS:** K88195 * **AISI/ASTM:** M50 * **AMS:** 6491 (Steel Bars, Forgings, and Rings) * **EURONORM:** 1.3541 (Similar, not identical) * **ISO:** Not directly standardized under a common ISO number, but specified in aerospace and bearing standards worldwide (e.g., SAE AS 2301). #### **3. Chemical Composition (Typical, Weight %)** | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Carbon (C)** | 0.80 - 0.85 | **Molybdenum (Mo)** | 4.00 - 4.50 | | **Chromium (Cr)** | 3.75 - 4.25 | **Vanadium (V)** | 0.90 - 1.10 | | **Manganese (Mn)** | 0.20 - 0.35 | **Silicon (Si)** | 0.20 - 0.35 | | **Sulfur (S)** | ≤ 0.010 | **Phosphorus (P)** | ≤ 0.020 | | **Iron (Fe)** | Balance | #### **4. Heat Treatment: 1107°C (2025°F) Quench & Temper** This specific thermal processing route is critical for achieving the desired microstructure and properties: * **Austenitizing:** Heat to **1107°C (2025°F)** and hold to dissolve carbides and achieve solution saturation. * **Quenching:** Cool in **air or positive pressure gas** (air hardening) to form a martensitic structure with minimal distortion. * **Tempering (Double or Triple Temper):** Typically performed at **510°C to 595°C (950°F to 1100°F)**. The steel exhibits **secondary hardening**, where hardness increases during the first temper due to precipitation of fine alloy carbides (Mo, V). Subsequent tempers relieve stresses and ensure stability. * **Final Hardness:** Typically **HRC 60-65** after proper tempering. #### **5. Typical Physical & Mechanical Properties (After Q+T)** * **Density:** 7.83 g/cm³ (0.283 lb/in³) * **Modulus of Elasticity:** 210 - 215 GPa (30 - 31 x 10⁶ psi) * **Thermal Expansion Coefficient:** 11.0 x 10⁻⁶/°C (20-100°C) * **Hardness:** **62 - 65 HRC** * **Ultimate Tensile Strength:** ~ 2,240 MPa (325 ksi) * **Yield Strength (0.2% Offset):** ~ 2,070 MPa (300 ksi) * **Fracture Toughness:** Good for its high hardness level. #### **6. Primary Applications** ATI Allvac® M-50 in the Q+T condition is predominantly used in critical aerospace and high-performance industrial components: * **Aircraft Engine Main Shaft Bearings:** Especially in the high-temperature zones of jet engines. * **Auxiliary Power Unit (APU) Bearings** * **High-Speed Machine Tool Spindles** * **Precision Gears and Shafts** requiring high wear resistance. * **Critical Components in Helicopter Transmissions.** * **Specialized Rolling Contact Components** in extreme environments. #### **7. Availability & Processing Notes** * **Forms Available:** Premium melted (VIM-VAR) billets, bars, forgings, and rings. * **Machining:** Best performed in the annealed condition (~ 200 HB). Grinding after heat treatment is standard for final dimensional and surface finish accuracy. * **ATI Allvac® Expertise:** ATI offers this material with guaranteed cleanliness levels and tailored processing to meet stringent aerospace specifications for fatigue-critical applications. --- **Disclaimer:** The information provided is for reference purposes. Properties are typical and can vary based on processing, section size, and final heat treatment parameters. For critical applications, consult ATI Allvac technical data sheets and specifications. -:- For detailed product information, please contact sales. -: ATI Allvac® M-50 Specialty Steel, Heat Treatment: 1107°C (2025°F) Q+T Specification Dimensions Size： Diameter 20-1000 mm Length <6839 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. -: ATI Allvac® M-50 Specialty Steel, Heat Treatment: 1107°C (2025°F) Q+T Properties -:- For detailed product information, please contact sales. -:

Applications of ATI Allvac® M-50 Specialty Steel, Heat Treatment: 1107°C (2025°F) Q+T -:- For detailed product information, please contact sales. -: Chemical Identifiers ATI Allvac® M-50 Specialty Steel, Heat Treatment: 1107°C (2025°F) Q+T -:- For detailed product information, please contact sales. -:

Packing of ATI Allvac® M-50 Specialty Steel, Heat Treatment: 1107°C (2025°F) Q+T -:- 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 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 3310 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