Ovako 100Cr6 803F Steel

Ovako 100Cr6 803F Steel, Q/T (bainite) Product Information -:- For detailed product information, please contact sales. -: Ovako 100Cr6 803F Steel, Q/T (bainite) Synonyms -:- For detailed product information, please contact sales. -:

Ovako 100Cr6 803F Steel, Q/T (bainite) Product Information -:- For detailed product information, please contact sales. -: # **Ovako 100Cr6 803F Steel – Q/T (Quenched & Tempered to Bainitic Structure)** ## **Product Overview** Ovako 100Cr6 803F Q/T (Bainite) represents a **premium-grade engineered material** that synergistically combines the **fatigue-optimized foundation of the 803F grade** with the **superior mechanical properties of a lower bainitic microstructure**. By subjecting the enhanced-cleanliness 100Cr6 base to a precise isothermal heat treatment, this product achieves a final state that offers an **exceptional balance of high strength, outstanding toughness, and maximum fatigue resistance**. It is engineered for the most demanding applications where component reliability, damage tolerance, and extended service life under severe cyclic loading are paramount. ## **Key Features & Benefits** * **Maximum Fatigue Performance:** The 803F substrate provides improved micro-cleanliness, directly reducing stress-concentrating inclusions. When combined with the crack-arresting properties of the fine, acicular bainitic structure, the result is **exceptional Rolling Contact Fatigue (RCF) and bending fatigue life**—among the highest attainable for this alloy class—with minimal performance scatter. * **Superior Toughness at High Hardness:** Achieving a hardness of **58-62 HRC**, this bainitic variant delivers **significantly higher impact toughness and fracture resistance** than its martensitic counterpart (803F Q/T Martensite). This dramatically reduces the risk of brittle fracture under shock loads or overload conditions. * **Enhanced Dimensional Stability:** The isothermal transformation process generates lower internal stresses than conventional martensitic quenching, resulting in **minimal distortion and highly predictable dimensional changes**. This allows for the manufacture of large or complex precision components with tight geometric tolerances. * **Optimal Damage Tolerance:** The combination of a tough bainitic matrix and a cleaner steel substrate creates a material with excellent resistance to damage from handling, surface defects, or incidental impact, ensuring greater robustness throughout the component's lifecycle. * **Reliable Performance Under Stress:** This material is specifically designed to provide a **wide safety margin** in high-stress applications, offering reliable performance even under variable or unpredictable loading conditions where both wear and shock resistance are required. ## **International Standards & Designations** This is a high-performance, process-specific material typically governed by stringent application requirements. | Base Material Standard | Metallurgical Condition | Ovako Designation | Comparable/Related Specifications | | :--- | :--- | :--- | :--- | | **EN 1.3505 (100Cr6)** | Quenched & Tempered to Bainite (Fatigue-Optimized) | **100Cr6 803F Q/T (Bainite)** | Represents a **top-tier performance grade** often specified for **mission-critical components** in heavy industry, advanced energy, and transportation sectors. It fulfills requirements where both material cleanliness and advanced microstructure are mandated. | ## **Chemical Composition (Typical - %)** The core composition is that of the fatigue-optimized 803F grade, providing the necessary foundation. | Element | Content (%) | Role in Bainitic Condition | | :--- | :--- | :--- | | **Carbon (C)** | 0.98 - 1.10 | Provides solid solution strengthening in bainitic ferrite and enables fine carbide precipitation. Uniform distribution is critical. | | **Chromium (Cr)** | 1.35 - 1.60 | Delays transformation, facilitating the bainitic process; contributes to the formation of fine, stable alloy carbides for wear resistance. | | **Manganese (Mn)** | 0.25 - 0.45 | Provides sufficient hardenability to avoid pearlite formation during controlled cooling. | | **Silicon (Si)** | 0.15 - 0.35 | **Crucial element.** Strongly suppresses cementite formation, promoting carbon enrichment of austenite and the formation of **toughness-enhancing interlath retained austenite** films. | | **Sulfur (S)** | **≤ 0.008** | **Low sulfur content** is a hallmark of the F-grade. This minimizes MnS inclusions, which are detrimental to fatigue performance. The cleaner matrix allows the full benefits of the bainitic microstructure to be realized. | | **Phosphorus (P)** | **≤ 0.015** | Kept very low to prevent grain boundary embrittlement and maximize toughness. | | **Oxygen [O]** | **< 12 ppm** | Controlled low oxygen minimizes oxide inclusions, preserving the integrity of the high-stress subsurface zone. | | **Iron (Fe)** | Balance | | ## **Physical & Mechanical Properties (Bainitic Q/T Condition)** * **Hardness:** **58 - 62 HRC** (Typical target: **60-61 HRC**) * **Ultimate Tensile Strength (UTS):** ~2000 - 2250 MPa * **Yield Strength (0.2% offset):** ~1600 - 1850 MPa * **Fracture Toughness (KIC):** **High**, typically **25-35 MPa√m**. * **Impact Toughness (Charpy V-notch):** Typically **15-25 J** at room temperature. * **Rolling Contact Fatigue (RCF) Life:** **Exceptional.** Exhibits one of the highest L10 lives achievable with 100Cr6 chemistry, characterized by a very narrow statistical scatter band. * **Dimensional Stability:** Excellent, with very low distortion (typically < 0.05% dimensional change on critical features). * **Microstructure:** Fine, acicular **lower bainite** with intra-lath carbides, interlath films of **stable retained austenite**, and a uniform dispersion of primary carbides. ## **Typical Applications** This material is reserved for the most critical components in systems where failure carries severe consequences. * **Critical Wind Turbine Components:** Main shaft and gearbox bearings in multi-megawatt offshore turbines, where reliability and minimum maintenance are essential. * **Heavy-Duty Mining & Minerals Processing:** Critical bearings in large crushers, grinding mills, and high-capacity conveyors. * **Aerospace Gearbox & Transmission Components:** Gears and bearing races in auxiliary power units and rotorcraft transmissions. * **High-Performance Defense & Racing Applications:** Drivetrain components subjected to extreme and variable loads where durability is critical. * **Advanced Industrial Machinery:** Bearings and rolls in high-speed paper machines, steel processing lines, and other continuous process equipment requiring maximum uptime. ## **Processing Guidelines** * **Supply Condition:** Supplied as **finished or semi-finished precision components** in the final bainitic condition. **Absolutely no further heat treatment is permitted.** * **Component Design:** The excellent toughness and fatigue resistance allow for optimized designs that can withstand more severe operating conditions or enable weight reduction with maintained safety factors. * **Machining (Post-Heat Treatment):** Limited to **precision finishing operations**: **Grinding, honing, lapping, and superfinishing**. The material's stability permits efficient stock removal. * **Handling & Inspection:** Standard practices for high-value precision components apply. The high toughness makes them less sensitive to handling damage. ## **Summary** **Ovako 100Cr6 803F Steel in the Q/T Bainitic condition** is a **pinnacle material solution for extreme durability**. It achieves a powerful synergy by applying the transformative benefits of a bainitic microstructure to a steel substrate already engineered for superior fatigue resistance. This combination delivers unparalleled performance in terms of **fatigue life, fracture toughness, and operational reliability**. For engineers designing against catastrophic failure in the world's most demanding mechanical systems—where downtime costs are exorbitant and safety is imperative—this material provides the ultimate confidence, offering extended service life and robust performance under the most severe operating conditions. -:- For detailed product information, please contact sales. -: Ovako 100Cr6 803F Steel, Q/T (bainite) Specification Dimensions Size： Diameter 20-1000 mm Length <5274 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. -: Ovako 100Cr6 803F Steel, Q/T (bainite) Properties -:- For detailed product information, please contact sales. -:

Applications of Ovako 100Cr6 803F Steel, Q/T (bainite) -:- For detailed product information, please contact sales. -: Chemical Identifiers Ovako 100Cr6 803F Steel, Q/T (bainite) -:- For detailed product information, please contact sales. -:

Packing of Ovako 100Cr6 803F Steel, Q/T (bainite) -:- 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 1745 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