Ovako 100CrMnSi4-4 831B Steel, Spheroidize annealing

Ovako 100CrMnSi4-4 831B Steel, Spheroidize annealing Product Information -:- For detailed product information, please contact sales. -: Ovako 100CrMnSi4-4 831B Steel, Spheroidize annealing Synonyms -:- For detailed product information, please contact sales. -:

Ovako 100CrMnSi4-4 831B Steel, Spheroidize annealing Product Information -:- For detailed product information, please contact sales. -: # **Ovako 100CrMnSi4-4 831B Steel – Spheroidize Annealed Condition** ## **Product Overview** Ovako 100CrMnSi4-4 831B is a **high-carbon, silicon-enhanced bearing steel** supplied in a **spheroidize annealed condition**, engineered to provide a unique combination of **high strength, excellent wear resistance, and improved toughness**. This alloy distinguishes itself from standard 100Cr6 through a **significantly elevated silicon content** and balanced chromium-manganese levels, which enhance its solid solution strengthening and tempering resistance. The **"831B"** designation represents Ovako's premium quality grade for this specific chemistry, characterized by controlled processing and micro-cleanliness. The spheroidize annealed microstructure ensures optimal machinability and a homogeneous foundation for subsequent through-hardening heat treatment, making it ideal for components demanding superior mechanical performance under high stress. ## **Key Features & Benefits** * **Enhanced Strength and Toughness Balance:** The high silicon content (up to 0.70%) provides potent solid solution strengthening of the ferritic matrix, which translates to **higher core strength and improved toughness** in the hardened state compared to standard 100Cr6 at equivalent hardness levels. Silicon also suppresses the formation of brittle cementite, further benefiting ductility. * **Excellent Wear Resistance and Hardness Potential:** With a carbon content similar to 100Cr6 and sufficient chromium, the steel can achieve high hardness (**60-64 HRC**) after quenching and tempering, providing excellent resistance to abrasive wear and rolling contact fatigue. * **Improved Temper Resistance and Stability:** Silicon markedly increases the steel's resistance to softening during tempering. This allows components to **retain higher hardness at elevated operating temperatures** or permits the use of slightly higher tempering temperatures to improve toughness without excessive loss of hardness. * **Superior Machinability in Annealed State:** The spheroidize annealed condition provides a uniform hardness of ~200 HB and a fine globular carbide structure, ensuring **good chip formation, extended tool life, and efficient machining** of complex geometries prior to heat treatment. * **Good Hardenability:** The balanced chromium and manganese content provides adequate hardenability for through-hardening of moderately sized components, ensuring uniform properties. ## **International Standards & Designations** This steel corresponds to a specific silicon-enhanced bearing steel grade within European standards. | Region/Standard | Standard Designation | Common Name / Equivalent | | :--- | :--- | :--- | | **EUR (EN)** | **1.3537** | The direct standard designation. The name **100CrMnSi4-4** describes its chemistry (C~1%, Cr~1%, Mn~1%, Si~0.7%). | | **Germany (DIN / W-Nr.)** | **100CrMnSi4-4 / 1.3537** | | | **ISO** | **ISO 683-17: 100CrMnSi4** | Recognized variant within the bearing steel standard. | | **USA (AISI/ASTM)** | **No direct equivalent.** | Functionally similar to a modified **52100 with high silicon**. | | **Ovako Designation** | **831B** | "831" correlates with the material number 1.3537; **"B"** denotes a specific, controlled quality level within Ovako's production. | ## **Chemical Composition (Typical - %)** The composition is defined by its elevated silicon and balanced alloying. | Element | Content (%) | Role | | :--- | :--- | :--- | | **Carbon (C)** | 0.95 - 1.10 | Provides the carbon necessary for high-carbon martensite and carbide formation upon hardening. | | **Chromium (Cr)** | 0.90 - 1.20 | Enhances hardenability and promotes the formation of wear-resistant chromium carbides. | | **Manganese (Mn)** | 0.90 - 1.20 | Increases hardenability and strength. Works in tandem with silicon. | | **Silicon (Si)** | **0.50 - 0.70** | **Key differentiating element.** Powerful solid solution strengthener; significantly increases tempering resistance; improves toughness by suppressing brittle cementite; raises the elastic limit. | | **Sulfur (S)** | ≤ 0.010 | Kept low to ensure good transverse toughness and fatigue properties. | | **Phosphorus (P)** | ≤ 0.020 | Kept low. | | **Iron (Fe)** | Balance | | ## **Physical & Mechanical Properties (Spheroidize Annealed Condition)** * **Delivery Hardness:** **190 - 220 HB** (Typical aim: ~205 HB) * **Microstructure:** **Spheroidized carbides** in a ferritic matrix. * **Tensile Strength:** ~700 - 850 MPa * **Yield Strength (Rp0.2):** ~450 - 600 MPa * **Elongation (A5):** ≥ 15% * **Machinability:** Good, comparable to other annealed alloy steels of similar hardness. ## **Properties After Hardening & Tempering (Typical Process)** * **Austenitizing:** 830-850°C (Note: Si can slightly raise Ac1 temperature). * **Quenching:** Oil quench. * **Tempering:** 150-200°C. Due to high Si, tempering resistance is high. * **Final Hardness:** **60 - 64 HRC** * **Tensile Strength:** ~2100 - 2400 MPa * **Toughness:** Better than standard 100Cr6 at equivalent hardness due to Si benefit. ## **Typical Applications** This material is specified for high-performance components requiring a superior strength-toughness balance. * **High-Stress Bearings:** Bearings for applications with high dynamic loads and demanding fatigue life requirements, such as in gearboxes, heavy-duty pumps, and high-speed spindles. * **Precision Machine Components:** Gears, shafts, and rollers requiring high wear resistance and good impact tolerance. * **Tooling and Wear Parts:** Dies, guides, and fixtures where resistance to deformation and wear is critical. * **Automotive Performance Components:** High-stress transmission parts, camshafts, and valve train components. * **Aerospace and Defense Components:** Critical bearing and gear applications where reliability under varied loads is essential. ## **Processing Guidelines** * **Machining:** Perform all machining in the soft, spheroidize annealed condition. * **Heat Treatment (Customer Process):** 1. **Preheating:** Recommended, especially due to higher alloy content. 2. **Austenitizing:** 830-850°C in a controlled atmosphere. Soaking time should be sufficient for carbide dissolution. 3. **Quenching:** Agitated oil quench. 4. **Tempering:** Double tempering is recommended. The high Si content allows for effective tempering in the 180-220°C range to optimize toughness without significant hardness loss. * **Grinding:** Perform after hardening to achieve final dimensions. ## **Summary** **Ovako 100CrMnSi4-4 831B Steel in the Spheroidize Annealed condition** is a **specialized, high-performance bearing steel** that leverages silicon alloying to achieve a superior property profile. It offers an excellent compromise between the high hardness/wear resistance of classic 100Cr6 and the improved toughness and tempering stability provided by its elevated silicon content. For engineers seeking to push the performance limits of through-hardened components—where increased strength, better thermal stability, or enhanced damage tolerance are required—the 831B grade provides a proven and reliable material solution with distinct metallurgical advantages. -:- For detailed product information, please contact sales. -: Ovako 100CrMnSi4-4 831B Steel, Spheroidize annealing Specification Dimensions Size： Diameter 20-1000 mm Length <5289 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 100CrMnSi4-4 831B Steel, Spheroidize annealing Properties -:- For detailed product information, please contact sales. -:

Applications of Ovako 100CrMnSi4-4 831B Steel, Spheroidize annealing -:- For detailed product information, please contact sales. -: Chemical Identifiers Ovako 100CrMnSi4-4 831B Steel, Spheroidize annealing -:- For detailed product information, please contact sales. -:

Packing of Ovako 100CrMnSi4-4 831B Steel, 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 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 1760 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