100CrMnSi6-4 837S Steel Wire

Ovako 100CrMnSi6-4 837S Steel Wire Product Information -:- For detailed product information, please contact sales. -: Ovako 100CrMnSi6-4 837S Steel Wire Synonyms -:- For detailed product information, please contact sales. -:

Ovako 100CrMnSi6-4 837S Steel Product Information -:- For detailed product information, please contact sales. -: # **Ovako 100CrMnSi6-4 837S Steel** ## **Product Overview** Ovako 100CrMnSi6-4 837S is a **premium-grade, silicon-enhanced bearing steel** engineered for applications demanding **exceptional micro-cleanliness, homogeneity, and fatigue performance**. This alloy represents a high-quality variant within the 100CrMnSi6-4 family, where the **"S"** suffix denotes **Superior or Special quality**, characterized by stringent control over non-metallic inclusions, reduced segregation, and optimized processing. With its balanced chromium, manganese, and elevated silicon content, this steel delivers a superior combination of **high strength, excellent toughness, and outstanding rolling contact fatigue life** compared to standard bearing steels, making it ideal for the most critical and heavily loaded components. ## **Key Features & Benefits** * **Superior Micro-Cleanliness & Fatigue Performance:** The "S" quality grade ensures **extremely low levels of oxides and sulfides**, significantly reducing stress concentration sites that initiate fatigue cracks. This results in **exceptional and predictable Rolling Contact Fatigue (RCF) life** with minimal statistical scatter, providing maximum reliability for bearing applications. * **Enhanced Strength-Toughness Synergy:** The elevated silicon content (typically 0.5-0.7%) provides potent solid solution strengthening of the matrix, leading to **higher tensile and yield strength at equivalent hardness levels**. Simultaneously, silicon improves toughness by suppressing the formation of brittle cementite, creating an optimal balance for high-stress applications. * **Excellent Temper Resistance & Dimensional Stability:** Silicon markedly increases resistance to softening during tempering, allowing components to **retain hardness at elevated operating temperatures** or enabling higher tempering temperatures to improve toughness without compromising performance. The clean, homogeneous structure also promotes excellent dimensional stability during heat treatment. * **Consistent and Predictable Hardenability:** The controlled chemistry and homogeneous microstructure of the 837S grade ensure uniform and predictable response to heat treatment, guaranteeing **consistent through-hardness and mechanical properties** in the final component, batch after batch. * **Ideal for Demanding and Safety-Critical Applications:** This material is specifically designed for components where failure is not an option, offering an extra margin of safety and performance in aerospace, energy, high-performance automotive, and advanced industrial machinery. ## **International Standards & Designations** This is a premium quality variant of a standardized silicon-bearing steel. | Region/Standard | Standard Designation | Common Name / Equivalent | | :--- | :--- | :--- | | **EUR (EN)** | **1.3538** (or similar) | Base material standard. The "S" quality exceeds standard requirements. | | **ISO** | **ISO 683-17: 100CrMnSi6-4** | Recognized variant. | | **Germany (DIN / W-Nr.)** | **100CrMnSi6-4 / ~1.3538** + special quality designations (e.g., EP) | | | **Ovako Designation** | **837S** | **"837"** correlates with the base material number; **"S"** denotes **Superior/Special quality** with enhanced cleanliness and consistency. | ## **Chemical Composition (Typical - %)** The composition is tightly controlled to achieve the "S" grade performance. | Element | Content (%) | Role & Quality Implication | | :--- | :--- | :--- | | **Carbon (C)** | 0.95 - 1.10 | Basis for hardness. Tight control ensures consistency. | | **Chromium (Cr)** | 1.40 - 1.70 | Enhances hardenability and wear resistance. | | **Manganese (Mn)** | 0.60 - 1.00 | Increases hardenability. | | **Silicon (Si)** | **0.50 - 0.70** | **Key element.** Provides solid solution strengthening and tempering resistance. | | **Sulfur (S)** | **≤ 0.003** | **Extremely low.** Hallmark of "S" quality. Minimizes MnS inclusions to maximize fatigue life and transverse toughness. | | **Phosphorus (P)** | **≤ 0.012** | Kept at ultra-low levels. | | **Oxygen [O]** | **< 10 ppm** | Very low total oxygen content to minimize oxide inclusions. | | **Iron (Fe)** | Balance | | ## **Physical & Mechanical Properties (After Optimal Heat Treatment)** * **Hardness (Hardened & Tempered):** **60 - 64 HRC** (Typical aim: 61-62 HRC for bearings) * **Ultimate Tensile Strength (UTS):** **2050 - 2350 MPa** * **Yield Strength (0.2% offset):** **1650 - 1950 MPa** * **Fracture Toughness (KIC):** **Good to Very Good**, improved over standard grades due to Si and cleanliness. * **Impact Toughness (Charpy V-notch):** Typically superior to standard 100Cr6 at equivalent hardness. * **Rolling Contact Fatigue Life (L10):** **Excellent.** Demonstrates one of the highest achievable lives for through-hardened bearing steels, with a very narrow scatter band. ## **Typical Applications** This premium material is specified for the most critical components across advanced industries. * **Aerospace & Defense Bearings:** Main shaft bearings for jet engines, critical bearings in flight control systems, and helicopter transmissions. * **High-Performance Automotive Racing Components:** Bearings and transmission gears in Formula 1, endurance racing, and high-end supercars. * **Critical Wind Turbine Components:** Main shaft and gearbox bearings for multi-megawatt offshore turbines where reliability and longevity are paramount. * **Precision Machine Tool Spindles:** High-speed and high-stiffness spindles for grinding and milling machines. * **Advanced Medical & Scientific Equipment:** Bearings in MRI scanners, high-speed centrifuges, and precision instruments. ## **Processing Guidelines** * **Supply Condition:** Typically supplied in a **soft-annealed or spheroidize annealed condition** (~200 HB) for machining. * **Heat Treatment (Customer Process):** 1. **Austenitizing:** 830-850°C in a **vacuum or high-purity controlled atmosphere furnace** to preserve surface integrity. The clean steel is less prone to intergranular oxidation. 2. **Quenching:** Oil or high-pressure gas quenching. 3. **Tempering:** **Double or triple tempering** at 160-220°C is recommended to achieve optimal stability and toughness. * **Grinding & Finishing:** The clean microstructure allows for excellent grindability and the potential to achieve superior surface finishes. ## **Summary** **Ovako 100CrMnSi6-4 837S Steel** is not merely a material but a **performance-guaranteed engineering solution** for the most demanding applications. It elevates the inherent advantages of silicon-alloyed bearing steel by incorporating the highest standards of micro-cleanliness and process control ("S" grade). This results in a component that offers **unmatched fatigue life, superior strength, and exceptional reliability**. For engineers designing systems where performance limits are constantly being pushed and where material failure carries extreme consequences, the 837S grade provides the ultimate confidence, representing the pinnacle of through-hardened bearing steel technology. -:- For detailed product information, please contact sales. -: Ovako 100CrMnSi6-4 837S Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5291 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 100CrMnSi6-4 837S Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Ovako 100CrMnSi6-4 837S Steel Wire -:- For detailed product information, please contact sales. -: Chemical Identifiers Ovako 100CrMnSi6-4 837S Steel Wire -:- For detailed product information, please contact sales. -:

Packing of Ovako 100CrMnSi6-4 837S Steel Wire -:- 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 Wire 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 1762 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