100Cr6 803P Steel Rod/Bar

Ovako 100Cr6 803P Steel Rod, Spheroidize annealing Product Information -:- For detailed product information, please contact sales. -: Ovako 100Cr6 803P Steel Rod, Spheroidize annealing Synonyms -:- For detailed product information, please contact sales. -:

Ovako 100Cr6 803P Steel, Spheroidize annealing Product Information -:- For detailed product information, please contact sales. -: # **Ovako 100Cr6 803P Steel – Spheroidize Annealed Condition** ## **Product Overview** Ovako 100Cr6 803P is a premium-grade, high-carbon chromium bearing steel supplied in a **spheroidize annealed condition**, specifically engineered for applications demanding **exceptional dimensional stability and predictable heat treatment response**. The **"803P"** designation represents Ovako's highest tier of dimensional precision and microstructural consistency, achieved through specialized processing that refines the steel's behavior during subsequent hardening operations. Unlike grades optimized for machinability or extreme cleanliness, the 803P grade focuses on minimizing distortion and ensuring uniform property distribution, making it the ideal choice for manufacturing large, complex, or thin-walled precision components where shape retention is critical. ## **Key Features & Benefits** * **Superior Dimensional Stability:** The core value proposition of 803P steel lies in its exceptional ability to maintain shape and dimensions during heat treatment. Through precise control of chemical segregation and a homogeneous spheroidized microstructure, this grade exhibits **minimal and predictable distortion** during quenching, reducing scrap rates and the need for extensive post-hardening machining. * **Homogeneous Microstructure:** The spheroidize annealing process produces a highly uniform distribution of fine, globular carbides within a soft ferrite matrix. This uniformity ensures **consistent hardenability and transformation behavior** throughout the entire component cross-section, eliminating soft spots and irregular property gradients. * **Excellent Grindability & Polishability:** The consistent carbide structure and controlled hardness in the annealed state (~200 HB) provide excellent conditions for machining and, more importantly, for subsequent grinding operations after hardening. This results in better surface finish, reduced grinding time, and lower risk of thermal damage during finishing. * **Predictable Heat Treatment Response:** Engineers can rely on highly consistent transformation characteristics (Ms temperature, hardenability) from batch to batch, enabling more accurate simulation of heat treatment processes and reliable prediction of final component dimensions. * **Optimized for Large/Complex Components:** Particularly valuable for manufacturing large bearing rings, thin-section components, and asymmetrical parts where differential cooling during quenching would normally cause unacceptable distortion in standard grades. ## **International Standards & Designations** The 803P grade represents a premium variant within standard bearing steel specifications, emphasizing dimensional control. | Region/Standard | Standard Designation | Equivalent / Similar Grade | Key Characteristic | | :--- | :--- | :--- | :--- | | **EUR (EN)** | **1.3505** (100Cr6) | Base material standard with enhanced processing. | Premium dimensional stability grade. | | **ISO** | **ISO 683-17: 100Cr6** | Standard for through-hardening bearing steel. | Special quality with dimensional focus. | | **USA (AISI/ASTM)** | **52100** (Premium Grade) | Often referred to as "52100 with low distortion characteristics". | | | **Japan (JIS)** | **SUJ2** (Special quality) | | | | **Germany (DIN / W-Nr.)** | **100Cr6 / 1.3505** | With special processing designations. | | | **Ovako Designation** | **803P** | "P" denotes optimized dimensional precision and stability during heat treatment. | | ## **Chemical Composition (Typical - %)** The composition maintains strict 100Cr6 specifications with enhanced control over homogeneity. | Element | Content (%) | Role & Special Characteristic | | :--- | :--- | :--- | | **Carbon (C)** | 0.98 - 1.10 | Provides high hardness and wear resistance through martensite and carbide formation upon hardening. | | **Chromium (Cr)** | 1.35 - 1.60 | Improves hardenability, promotes fine carbide formation, and enhances wear resistance. | | **Manganese (Mn)** | 0.25 - 0.45 | Increases hardenability while maintaining good dimensional stability when properly controlled. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer, increases strength and tempering resistance. Content optimized for minimal distortion. | | **Phosphorus (P)** | ≤ 0.015 | Kept very low to improve toughness and reduce distortion sensitivity. | | **Sulfur (S)** | ≤ 0.008 | Low sulfur content minimizes MnS inclusions that can cause uneven transformation and distortion. | | **Residual Elements (Ni, Cu, Mo)** | Tightly controlled | Minimal variation to ensure consistent transformation behavior. | | **Segregation Index** | Exceptionally low | Key to dimensional stability - ensures uniform chemistry throughout the cross-section. | | **Iron (Fe)** | Balance | | ## **Physical & Mechanical Properties (Spheroidize Annealed Condition)** * **Delivery Hardness:** **190 - 215 HB** (Tighter range than standard grades) * **Microstructure:** Exceptionally uniform **spheroidized carbide** distribution in ferrite matrix. Carbide size distribution is narrow and controlled. * **Tensile Strength:** ~650 - 750 MPa * **Yield Strength (Rp0.2):** ~400 - 500 MPa * **Elongation (A5):** ~20 - 30% * **Reduction of Area (Z):** ~50 - 65% * **Distortion Factor:** Significantly lower than standard 100Cr6 grades during quenching (typically 30-50% improvement in dimensional stability) * **Density:** 7.83 g/cm³ * **Thermal Conductivity:** ~46 W/(m·K) at 20°C * **Coefficient of Thermal Expansion:** ~11.5 x 10⁻⁶/K (20-100°C) ## **Properties After Hardening & Tempering (Indicative)** * **Final Hardness (Quenched & Tempered):** **60 - 64 HRC** (with excellent uniformity) * **Dimensional Change:** Highly predictable, typically within ±0.05% for properly designed components * **Residual Stress Distribution:** More uniform and symmetric than standard grades * **Grinding Performance:** Excellent due to uniform carbide distribution and consistent hardness ## **Typical Applications** This premium spheroidize annealed material is specified for precision components where dimensional control is paramount. * **Large Precision Bearing Rings:** Main bearings for wind turbines, large industrial gearboxes, and aerospace applications where post-hardening machining is limited or impossible. * **Thin-Walled & Complex Components:** Bearing cages, special washers, and complex-shaped precision parts susceptible to distortion. * **Machine Tool Components:** High-precision spindles, arbors, and tool holders requiring minimal runout after heat treatment. * **Aerospace Bearing Components:** Critical bearing elements where dimensional precision directly affects performance and reliability. * **Medical Device Components:** Surgical tool bearings and precision instrumentation parts requiring exact dimensions. * **Automotive Transmission Components:** High-precision gears and bearing races for premium automotive applications. ## **Processing Guidelines** * **Machining:** Perform all machining in the soft, spheroidize annealed condition. The uniform hardness and microstructure ensure consistent cutting forces and predictable tool wear. For optimal dimensional stability, consider stress-relief annealing after rough machining for highly complex parts. * **Heat Treatment Best Practices:** 1. **Preheating:** Essential - use stepped preheating (450°C, then 650°C) to minimize thermal gradients. 2. **Austenitizing:** 830-850°C in precisely controlled atmosphere or vacuum furnace. Uniform temperature distribution is critical. 3. **Quenching:** Use agitated oil with controlled temperature. For large/thin parts, consider high-pressure gas quenching for more uniform cooling. 4. **Tempering:** Minimum double tempering at 150-200°C for stress relief and dimensional stabilization. * **Grinding:** After hardening, the uniform microstructure allows for stable grinding with reduced risk of thermal distortion or cracking. Still employ proper grinding techniques with adequate coolant. ## **Quality Assurance** * **Dimensional Monitoring:** Components should be measured at multiple stages (after machining, after heat treatment) to establish distortion patterns. * **Microstructure Analysis:** Regular checks of carbide distribution and size in annealed condition. * **Hardness Mapping:** Verify uniformity of hardness in annealed state and after heat treatment. ## **Summary** **Ovako 100Cr6 803P Steel in the Spheroidize Annealed condition** represents the **pinnacle of dimensional control** in bearing steel technology. It transforms the challenge of heat treatment distortion from an unpredictable variable into a manageable, predictable parameter. By offering exceptional microstructural homogeneity and consistent transformation behavior, this grade enables manufacturers to produce precision components with tighter tolerances, reduced rework, and higher reliability. For applications where "form" is as critical as "function"—where the precise shape of a hardened component determines its performance—803P provides an engineering solution that balances material performance with manufacturing precision. It is the definitive choice when every micron of dimensional accuracy matters in the final hardened component. -:- For detailed product information, please contact sales. -: Ovako 100Cr6 803P Steel, Spheroidize annealing Specification Dimensions Size： Diameter 20-1000 mm Length <5263 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 803P Steel, Spheroidize annealing Properties -:- For detailed product information, please contact sales. -:

Applications of Ovako 100Cr6 803P Steel Rod, Spheroidize annealing -:- For detailed product information, please contact sales. -: Chemical Identifiers Ovako 100Cr6 803P Steel Rod, Spheroidize annealing -:- For detailed product information, please contact sales. -:

Packing of Ovako 100Cr6 803P Steel Rod, Spheroidize annealing -:- 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 Rod 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 1734 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