20MnCr5 Carburizing Bearing Steel Wire

20MnCr5 Carburizing Bearing Steel Wire (Composition Spec) Product Information -:- For detailed product information, please contact sales. -: 20MnCr5 Carburizing Bearing Steel Wire (Composition Spec) Synonyms -:- For detailed product information, please contact sales. -:

20MnCr5 Carburizing Bearing Steel (Composition Spec) Product Information -:- For detailed product information, please contact sales. -: # **Product Technical Datasheet: 20MnCr5 (1.7147) Carburizing Bearing Steel** ## **1. Product Overview** **20MnCr5** (material number 1.7147) is a **manganese‑chromium alloyed carburizing steel** widely recognized in European standards. It is engineered to produce components with an exceptionally hard, wear‑resistant surface case and a tough, ductile core through carburizing (case hardening) heat treatment. While not a through‑hardening bearing steel like 100Cr6, it is a premier material for **high‑performance bearings, gears, and transmission components** subjected to high contact stresses, rolling fatigue, and shock loads. The steel is supplied in a soft‑annealed condition to ensure optimal machinability prior to the final thermochemical treatment. ## **2. Governing International Standards** 20MnCr5 is primarily defined by European standards, with direct equivalents in major international specifications: * **DIN / EN:** **EN ISO 683-11: 20MnCr5** (formerly DIN 1.7147) * **SAE / AISI:** **5120** (Very close equivalent; minor compositional differences may exist) * **JIS:** **SCr420** (Similar grade, slightly different Mn/Cr balance) * **GB:** **20MnCr5** or **20CrMn** * **UNI:** **20MnCr5** **Note:** The designation "20MnCr5" follows the European convention: ~0.20% Carbon, Manganese (Mn) alloyed, Chromium (Cr) ~1% (5/4 ≈ 1.25%). ## **3. Chemical Composition** The composition is balanced for good hardenability, core strength, and carburizing response. Standard composition ranges (in weight %) per EN 10084 are: * **Carbon (C):** 0.17 – 0.22% * **Silicon (Si):** 0.15 – 0.40% * **Manganese (Mn):** 1.10 – 1.40% (*Key element for hardenability*) * **Phosphorus (P):** ≤ 0.025% * **Sulfur (S):** ≤ 0.025% (Often controlled to lower levels for improved toughness) * **Chromium (Cr):** 1.00 – 1.30% * **Aluminum (Al):** ≤ 0.05% (for grain size control) * **Residuals:** Cu, Ni, Mo typically limited. **Key Feature:** The **elevated Manganese content (1.1-1.4%)** is a defining characteristic, providing excellent hardenability at a lower cost compared to nickel‑alloyed grades, enabling oil quenching of moderate‑sized parts to achieve a strong core. ## **4. Typical Properties & Heat Treatment Response** ### **As‑Supplied Condition (Soft‑Annealed):** * **Hardness:** 160 – 210 HBW * **Tensile Strength:** ~ 550 – 700 MPa * **Microstructure:** Fine ferrite‑pearlite, optimized for machining. ### **After Carburizing & Heat Treatment:** Standard process: Carburizing (e.g., at 930°C) → Direct Quenching or Re‑heat Quenching → Low‑Temperature Tempering (150‑200°C). * **Case Properties:** * **Surface Hardness:** 58 – 63 HRC (58 – 62 HRC typical after tempering) * **Effective Case Depth (ECD):** Typically specified from 0.5 to 2.0 mm at 550 HV. Excellent carburizing response due to composition. * **Microstructure:** High‑carbon martensite with fine carbides and controlled retained austenite. * **Core Properties:** * **Hardness:** 30 – 45 HRC (Depends on component size and quench) * **Core Tensile Strength:** 1000 – 1300 MPa * **Toughness:** Good impact resistance due to the low‑carbon martensitic/bainitic core structure. ### **Physical Properties:** * **Modulus of Elasticity:** 210 GPa * **Density:** 7.85 g/cm³ * **Coefficient of Thermal Expansion:** ~ 11.5 x 10⁻⁶/K (20–100°C) ## **5. Key Characteristics & Engineering Advantages** * **Excellent Hardenability/Cost Ratio:** The Mn‑Cr alloying provides deep hardenability more cost‑effectively than Ni‑Cr‑Mo grades, making it a preferred choice for high‑volume automotive components. * **Superior Wear & Pitting Resistance:** The hard carburized case offers outstanding resistance to abrasive wear and rolling contact fatigue (pitting). * **High Core Strength & Good Toughness:** Provides robust support for the hard case, capable of withstanding high bending and shock loads without brittle fracture. * **Good Machinability:** In the properly soft‑annealed condition, it allows for high‑productivity machining, grinding, and cold forming. * **Good Dimensional Stability:** Responds well to controlled carburizing and quenching processes, minimizing distortion. * **Wide Process Window:** Forgiving and well‑understood heat treatment response, suitable for mass production. ## **6. Typical Applications** 20MnCr5 is a staple material in the automotive and general machinery sectors for high‑stress, case‑hardened components: * **Bearings:** Needle and roller bearing races, cam followers, slewing ring gears for bearings, and heavy‑duty bearing cages. * **Automotive Gears & Transmissions:** Gear wheels, pinions, synchronizer hubs and rings, sun gears, and planet gears in manual transmissions and differentials. * **Automotive Shafts:** Driveshafts, axle shafts, and input/output shafts requiring a hardened surface. * **Industrial Gearing:** Heavy‑duty gears in industrial gearboxes, wind turbine gearbox components (certain stages), and mining equipment gearing. * **Other Components:** Piston pins, camshafts, and high‑wear machine tool parts. ## **7. Summary** **20MnCr5** is a **high‑performance, cost‑optimized manganese‑chromium carburizing steel** that delivers an exceptional combination of a **super‑hard, wear‑resistant case** and a **strong, tough core**. Its excellent hardenability derived from the Mn‑Cr balance makes it a first‑choice material for mass‑produced, critical automotive and industrial components where reliability, fatigue performance, and cost‑efficiency are paramount. Its standardization under EN ISO 683‑11 ensures consistent quality and global availability for demanding engineering applications. -:- For detailed product information, please contact sales. -: 20MnCr5 Carburizing Bearing Steel (Composition Spec) Specification Dimensions Size： Diameter 20-1000 mm Length <5865 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. -: 20MnCr5 Carburizing Bearing Steel (Composition Spec) Properties -:- For detailed product information, please contact sales. -:

Applications of 20MnCr5 Carburizing Bearing Steel Wire (Composition Spec) -:- For detailed product information, please contact sales. -: Chemical Identifiers 20MnCr5 Carburizing Bearing Steel Wire (Composition Spec) -:- For detailed product information, please contact sales. -:

Packing of 20MnCr5 Carburizing Bearing Steel Wire (Composition Spec) -:- 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 2336 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