100CrMo7-4 826B Steel Capillary

Ovako 100CrMo7-4 826B Steel Capillary, Q/T (bainite) Product Information -:- For detailed product information, please contact sales. -: Ovako 100CrMo7-4 826B Steel Capillary, Q/T (bainite) Synonyms -:- For detailed product information, please contact sales. -:

Ovako 100CrMo7-4 826B Steel, Q/T (bainite) Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: Ovako 100CrMo7-4 (826B) Steel – Quenched & Tempered to Bainitic Microstructure** **1. Product Overview** Ovako 100CrMo7-4 (commercial designation: 826B) is a high-quality, low-alloy through-hardening bearing steel. Its distinguishing feature is the specialized heat treatment process known as *Austempering* or *Quenching & Tempering to Bainite* (Q/T Bainite). This process yields a uniform microstructure of lower bainite, providing a superior combination of high strength, exceptional toughness, and good dimensional stability compared to conventional quenched and tempered martensitic structures. It is an ideal material for demanding applications subject to heavy loads, shock, and stress. **2. Key Advantages & Characteristics** * **Enhanced Toughness:** The bainitic microstructure offers significantly higher impact strength and fracture toughness than martensitic steels of similar hardness, reducing the risk of catastrophic failure. * **High Strength & Wear Resistance:** Maintains very high hardness and load-bearing capacity, ensuring excellent resistance to wear and rolling contact fatigue. * **Good Dimensional Stability:** Low distortion during heat treatment and stable performance under varying operational conditions. * **Improved Fatigue Life:** The fine bainitic structure can lead to extended component service life under cyclic loading. * **Favorable Residual Stress Profile:** The austempering process often induces beneficial compressive surface stresses. **3. Chemical Composition (Typical, wt.%)** The composition is balanced to ensure hardenability and the formation of optimal bainite. | Element | Carbon (C) | Chromium (Cr) | Molybdenum (Mo) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **Content** | 0.90 - 1.05 | 1.70 - 2.00 | 0.25 - 0.35 | 0.60 - 0.80 | 0.15 - 0.35 | ≤ 0.020 | ≤ 0.015 | *Note: Iron (Fe) constitutes the remainder. Ovako's clean steelmaking process ensures low levels of oxides and sulfides, enhancing fatigue properties.* **4. Physical & Mechanical Properties (After Q/T to Bainite)** Typical properties for a standard bainitic heat treatment (hardness range 58-62 HRC): * **Hardness:** 58 - 62 HRC (typical), 55 - 63 HRC (customizable range) * **Tensile Strength (Rm):** > 2,200 MPa * **Yield Strength (Rp0.2):** > 1,800 MPa * **Impact Toughness (KV):** ~25 - 40 J (significantly higher than martensitic grades at same hardness) * **Modulus of Elasticity (E):** ~210 GPa * **Density:** 7.83 g/cm³ * **Thermal Expansion Coefficient:** 11.5 x 10⁻⁶ /K (20-100°C) **5. International Standards & Cross-References** Ovako 100CrMo7-4 (826B) corresponds to several international standard grades, though the *bainitic heat treatment* is a specific processing addition. * **EN / DIN:** **100CrMo7-4** (1.3537) * **ISO:** **100CrMo7-4** * **ASTM:** Similar to **A485-3 (Grade 4)** or modified **52100** with Mo addition. * **JIS:** **SUJ 4** (similar, not exact) * **Ovako Proprietary Designation:** **826B** (specifically denotes the bainitic quality). **6. Product Applications** This steel is specified for highly stressed components where reliability, durability, and shock resistance are critical: * **Heavy-Duty Bearings:** Large spherical roller bearings, slewing rings, wind turbine bearings, rolling mill bearings. * **Automotive & Off-Highway:** Critical gears, transmission components, pivot pins, and high-stress bearings in demanding environments. * **Industrial Machinery:** Components in construction, mining, and agriculture equipment subject to impact and variable loads. * **Aerospace & Defense:** High-performance gears, landing gear components, and other safety-critical parts. * **Tooling:** Dies, punches, and forming tools requiring a combination of hardness and toughness. **7. Available Product Forms (from Ovako)** * Hot-rolled or forged bars * Cold-drawn bars * Tubes and rings * Custom-forged components **8. Heat Treatment Note** The unique value of this product lies in the controlled austempering process performed by Ovako. This involves: 1. Austenitizing 2. Quenching into a molten salt bath at a temperature above the martensite start (Ms) point. 3. Holding at this temperature to allow complete transformation to lower bainite. 4. Cooling to room temperature. This requires specialized equipment and expertise, making Ovako a qualified supplier for ready-to-use bainitic steel components. --- **Disclaimer:** This datasheet provides typical information. For precise specifications, technical advice, or data sheets for a specific product form, please consult Ovako's official technical documentation or contact their sales and engineering team directly. -:- For detailed product information, please contact sales. -: Ovako 100CrMo7-4 826B Steel, Q/T (bainite) Specification Dimensions Size： Diameter 20-1000 mm Length <5311 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 100CrMo7-4 826B Steel, Q/T (bainite) Properties -:- For detailed product information, please contact sales. -:

Applications of Ovako 100CrMo7-4 826B Steel Capillary, Q/T (bainite) -:- For detailed product information, please contact sales. -: Chemical Identifiers Ovako 100CrMo7-4 826B Steel Capillary, Q/T (bainite) -:- For detailed product information, please contact sales. -:

Packing of Ovako 100CrMo7-4 826B Steel Capillary, 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 Capillary 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 1782 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