Latrobe,CBS-600™ VIM-VAR Carburizing Bearing and Gear Steel Sheet,Plate

Latrobe CBS-600™ VIM-VAR Carburizing Bearing and Gear Steel Sheet/Plate Product Information -:- For detailed product information, please contact sales. -: Latrobe CBS-600™ VIM-VAR Carburizing Bearing and Gear Steel Sheet/Plate Synonyms -:- For detailed product information, please contact sales. -:

Latrobe CBS-600™ VIM-VAR Carburizing Bearing and Gear Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Datasheet: Latrobe CBS-600™ VIM-VAR Carburizing Bearing and Gear Steel** ## **1. Product Overview** **Latrobe CBS-600™ VIM-VAR** is an advanced **high-temperature carburizing steel** engineered specifically for extreme-duty aerospace bearing and gear applications. Manufactured through **Vacuum Induction Melting (VIM) followed by Vacuum Arc Remelting (VAR)**, this material delivers exceptional **elevated-temperature strength retention, superior fatigue resistance, and deep hardenability**. Designed to operate reliably at temperatures where conventional carburizing steels (such as CBS-50™ NiL or 9310) lose their mechanical edge, CBS-600™ represents the pinnacle of performance for next-generation turbine engines and high-speed transmissions. --- ## **2. Key Advantages & Characteristics** * **Exceptional High-Temperature Performance:** Maintains high surface hardness and core strength at operating temperatures exceeding **315°C (600°F)**, with useful strength up to approximately **480°C (900°F)**. * **Superior Rolling Contact Fatigue (RCF) Life:** The combination of a hard, wear-resistant case and a tough, high-strength core provides exceptional resistance to surface pitting and sub-surface fatigue failure under heavy loads. * **Deep and Uniform Case Hardenability:** Capable of achieving very deep effective case depths (>4.0 mm / 0.160"), making it ideal for large-section components like main shaft bearings and planet gears in planetary gearboxes. * **Unmatched Steel Cleanliness:** The dual VIM-VAR process ensures ultra-low levels of non-metallic inclusions (oxides, sulfides), dramatically reducing sites for fatigue crack initiation and improving overall component reliability. * **Excellent Fracture Toughness & Impact Resistance:** The alloying balance provides a high-strength core with good ductility and toughness to withstand shock loads and bending stresses. * **Optimized for Vacuum Carburizing:** The chemistry is tailored for compatibility with modern, precise vacuum carburizing processes, ensuring consistent case quality and minimal distortion. --- ## **3. Chemical Composition (Typical, wt.%)** The composition is a sophisticated balance of deep-hardenability elements and strong carbide formers for high-temperature stability. | Element | Content Range (Typical) | Metallurgical Function | | :--- | :--- | :--- | | **Carbon (C)** | 0.10 - 0.15 | Provides base hardenability; surface is enriched to ~0.8-1.0% during carburizing. | | **Chromium (Cr)** | 1.40 - 1.80 | Enhances hardenability, corrosion/oxidation resistance, and forms carbides for wear. | | **Nickel (Ni)** | 3.00 - 3.50 | **Primary toughener:** Significantly increases core toughness, ductility, and hardenability without compromising machinability. | | **Molybdenum (Mo)** | 4.75 - 5.25 | **Key high-temperature element:** Provides solid solution strengthening, enhances hardenability, and promotes secondary hardening for elevated temperature strength. | | **Vanadium (V)** | 0.40 - 0.70 | Forms fine, stable carbides for grain refinement, improving toughness and wear resistance. | | **Tungsten (W)** | 1.25 - 1.75 | Contributes to hot hardness and secondary hardening, synergizing with Molybdenum. | | **Manganese (Mn)** | 0.20 - 0.40 | Aids hardenability and acts as a deoxidizer. | | **Silicon (Si)** | 0.20 - 0.35 | Deoxidizer, provides solid solution strengthening. | | **Sulfur (S)** | ≤ 0.003 | Ultra-low to maximize transverse ductility, impact strength, and cleanliness. | | **Phosphorus (P)** | ≤ 0.012 | Ultra-low impurity control. | | **Iron (Fe)** | Balance | Matrix. | **VIM-VAR Process Benefits:** Oxygen typically <10 ppm, Hydrogen <2 ppm. Inclusion rating per ASTM E45 Method A is typically ≤0.5 (Thin/Heavy series). --- ## **4. Physical & Mechanical Properties** *Properties are achieved after full carburizing, quenching, and tempering heat treatment.* ### **A. Core Properties (After Heat Treatment)** * **Core Hardness:** 40 - 50 HRC (depends on tempering temperature) * **Ultimate Tensile Strength:** 1380 - 1655 MPa (200 - 240 ksi) * **Yield Strength (0.2% Offset):** 1170 - 1520 MPa (170 - 220 ksi) * **Elongation:** 8 - 12% * **Reduction in Area:** 30 - 45% * **Fracture Toughness (K_IC):** 25 - 32 MPa√m ### **B. Case Properties** * **Surface Hardness:** **60 - 65 HRC** (after tempering) * **Effective Case Depth (at 50 HRC):** Capable of **3.0 mm to >5.0 mm** (0.120" to >0.200"), customizable per application. * **Case Microstructure:** Fine, tempered martensite with a controlled amount of dispersed alloy carbides. ### **C. High-Temperature Performance** * **Surface Hardness Retention at 425°C (800°F):** ≥ 58 HRC * **Core Strength Retention at 425°C (800°F):** > 70% of room temperature strength ### **D. Physical Properties** * **Density:** ~7.85 g/cm³ * **Modulus of Elasticity:** ~205 GPa (30 x 10⁶ psi) * **Thermal Expansion Coefficient:** ~12.0 x 10⁻⁶ /°C (20-100°C) * **Thermal Conductivity:** ~28.0 W/m·K (at 100°C) --- ## **5. International Standards & Specifications** CBS-600™ is a proprietary, high-performance alloy. Its closest publicly documented equivalents are within aerospace specifications. * **Primary Aerospace Specification:** While proprietary, its performance aligns with and exceeds the intent of high-temperature carburizing steel requirements. * **Similar/Reference Standards:** * **AMS 6265:** Often referenced for high-temperature gear steels (though chemistry differs, performance philosophy is similar). * **AMS 2301:** **Premium** or **Special Cleanliness** grade is typically specified for CBS-600™ applications. * **AMS 2759/3:** Governs the carburizing and hardening heat treatment processes. * **Cross-Reference / Conceptually Similar:** * **AISI/SAE:** No direct equivalent. It is a more advanced evolution of high-temperature steels like **Pyrowear® 675** or **CSS-42L®**, with a chemistry optimized for the most demanding VIM-VAR applications. * **Aerospace Designations:** Used in programs requiring materials capable of **MIL-DTL-5000** or **GE**, **Pratt & Whitney**, **Rolls-Royce** material specifications for high-temperature gears and bearings. * **Industry Compliance:** Manufactured under **AS9100** quality systems and processes compatible with **NADCAP** accreditation for heat treating and testing. --- ## **6. Product Applications** CBS-600™ is specified for the most critically stressed, high-temperature components in advanced aerospace and industrial systems. * **Next-Generation Jet Engines:** **Fan Drive Gear System (FDGS)** sun gears, planet gears, and ring gears; turbine shaft bearings operating in hot sections. * **Advanced Helicopter Transmissions:** Main and tail rotor gearbox planet carriers, spiral bevel gears, and high-speed shaft bearings. * **Turboprop & Turboshaft Engines:** High-power reduction gearbox components. * **Industrial Gas Turbines (IGT):** Heavy-duty power generation drive train gears and bearings in high-temperature environments. * **High-Performance Racing:** Transmission gears and differential components in top-tier motorsports where power density and reliability are paramount. * **Advanced Defense Systems:** Critical gears in tiltrotor drives, unmanned aerial vehicle (UAV) transmissions, and other high-integrity platforms. --- ## **7. Heat Treatment & Processing Notes** Optimal performance is achieved through a controlled, multi-step thermal process: 1. **Carburizing:** **Vacuum Carburizing** is strongly preferred. Process temperatures range from **925°C to 1040°C (1700°F to 1900°F)** to achieve the required deep case. 2. **Diffusion:** A critical step to ensure a gradual carbon gradient from case to core. 3. **High-Temperature Austenitizing & Quenching:** Austenitizing is performed at high temperatures **(1065°C - 1120°C / 1950°F - 2050°F)** followed by oil or high-pressure gas quenching. 4. **Sub-Zero Treatment:** Commonly used to minimize retained austenite in the high-carbon case. 5. **Multiple Tempering:** **Double or triple tempering** within the range of **205°C to 595°C (400°F to 1100°F)** is essential. Higher tempering temperatures (e.g., 540°C+) are used to optimize the **secondary hardening response** for high-temperature applications, trading some room-temperature hardness for vastly improved hot hardness. **Machinability:** In the annealed condition, machinability is fair but requires more power and appropriate tooling (carbide) compared to lower-alloy steels due to its high alloy content and inherent strength. --- **Disclaimer:** This datasheet contains general information based on the performance characteristics of the CBS-600™ family of steels. **Latrobe Specialty Metals'** exact proprietary specifications, heat treatment protocols, and certified mechanical data are controlled documents. The successful application of CBS-600™ requires rigorous engineering analysis, prototype testing, and **direct collaboration with Latrobe's technical team** to define the precise material and processing specifications for any given component. Performance is critically dependent on exact chemistry, melting practice, and component-specific heat treatment. -:- For detailed product information, please contact sales. -: Latrobe CBS-600™ VIM-VAR Carburizing Bearing and Gear Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5324 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. -: Latrobe CBS-600™ VIM-VAR Carburizing Bearing and Gear Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Latrobe CBS-600™ VIM-VAR Carburizing Bearing and Gear Steel Sheet,Plate -:- For detailed product information, please contact sales. -: Chemical Identifiers Latrobe CBS-600™ VIM-VAR Carburizing Bearing and Gear Steel Sheet,Plate -:- For detailed product information, please contact sales. -:

Packing of Latrobe CBS-600™ VIM-VAR Carburizing Bearing and Gear Steel Sheet/Plate -:- 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 Sheet/Plate 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 1795 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