AISI 4820H Steel, direct quenched

AISI 4820H Steel, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth Product Information -:- For detailed product information, please contact sales. -: AISI 4820H Steel, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth Synonyms -:- For detailed product information, please contact sales. -:

AISI 4820H Steel, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth Product Information -:- For detailed product information, please contact sales. -: **Product Datasheet: AISI 4820H Steel, Direct Quenched & Tempered** **1. Product Overview** This datasheet describes a high-performance case-hardening steel, AISI 4820H, processed via a specialized **Direct Quenching** method from the carburizing pot followed by a low-temperature temper. The material features a hardened case depth of **0.99 mm (0.039 inches)**, offering an exceptional combination of a very hard, wear-resistant surface and a tough, ductile core. This process optimizes microstructural refinement and residual stress profiles, enhancing fatigue strength and load-bearing capacity. **2. Key International Standards** * **Material Designation:** AISI 4820H, SAE 4820H (U.S.A.), Corresponds to European EN 20NiCrMo2-2 (1.6523). * **H-Steel Designation:** The "H" suffix indicates steel produced to specific hardenability band requirements as per **ASTM A304**. * **Processing Standard:** The direct quenching practice is often aligned with principles in **AMS 2759/7** (Carburizing and Hardening of Steel Parts) and **SAE J1268**. **3. Chemical Composition (Weight %)** The composition is tightly controlled to ensure consistent hardenability (H-Band). | Element | Min (%) | Max (%) | Typical (%) | Function | | :--- | :--- | :--- | :--- | :--- | | **Carbon (C)** | 0.17 | 0.23 | 0.20 | Core strength & hardenability | | **Manganese (Mn)** | 0.40 | 0.70 | 0.55 | Hardenability, strength | | **Phosphorus (P)** | - | 0.035 max | 0.020 | Residual element | | **Sulfur (S)** | - | 0.040 max | 0.025 | Machinability (forms inclusions) | | **Silicon (Si)** | 0.15 | 0.35 | 0.25 | Deoxidizer, strength | | **Nickel (Ni)** | 3.20 | 3.60 | 3.40 | Core toughness, hardenability | | **Chromium (Cr)** | 0.35 | 0.65 | 0.50 | Hardness, wear resistance | | **Molybdenum (Mo)**| 0.20 | 0.30 | 0.25 | Hardenability, temper resistance | **4. Physical & Mechanical Properties (Typical After Direct Quench & Temper @150°C)** * **Case Depth (CHD):** **0.99 mm** (Effective Case Depth to 550 HV). * **Surface Hardness:** **58-63 HRC** (660-780 HV). * **Core Hardness:** **35-45 HRC** (dependent on part size). * **Core Tensile Strength:** ~ **1150 - 1400 MPa**. * **Core Yield Strength:** ~ **950 - 1200 MPa**. * **Core Elongation:** ~ **12 - 18%**. * **Impact Toughness (Core):** Excellent due to Ni-Mo content and direct quench refinement. **5. Key Characteristics & Advantages** * **Superior Fatigue Performance:** The direct quench process results in a finer prior austenite grain size and favorable compressive residual stresses in the case, significantly improving bending fatigue and contact fatigue resistance. * **Enhanced Dimensional Stability:** Reduced distortion compared to reheat quenching processes, lowering subsequent machining/finishing costs. * **Deep Hardening Capability:** The Ni-Cr-Mo alloy system provides high hardenability, ensuring deep and uniform hardening even in larger cross-sections. * **Optimal Property Gradient:** Provides a seamless transition from the ultra-hard case to the strong, shock-absorbing core. **6. Primary Applications** This material and process combination is engineered for high-stress, heavy-duty components requiring maximum durability: * **Gearboxes:** Heavy-duty transmission gears, pinions, synchronizer hubs (for automotive, trucking, mining, and wind energy). * **Power Transmission:** High-load planetary gears, splined shafts, differential side gears. * **Aerospace:** Critical gears and bearing components in auxiliary systems. * **Industrial Machinery:** Heavy-duty rollers, camshafts, pins, and high-wear components in construction and agricultural equipment. **7. Processing Notes** * **Direct Quench:** The component is quenched directly from the carburizing temperature, eliminating a full reheat cycle. * **Tempering:** A mandatory low-temperature temper at **150°C (300°F)** is performed to relieve quenching stresses without significantly reducing hardness, improving ductility and stability. * **Post-Processing:** Components may undergo finishing processes like grinding or shot peening to achieve final dimensions and further enhance fatigue performance. --- **Disclaimer:** The values provided are typical. For critical applications, specific testing and validation against agreed-upon specifications between supplier and customer are required. -:- For detailed product information, please contact sales. -: AISI 4820H Steel, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth Specification Dimensions Size： Diameter 20-1000 mm Length <4090 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. -: AISI 4820H Steel, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4820H Steel, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4820H Steel, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth -:- For detailed product information, please contact sales. -:

Packing of AISI 4820H Steel, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth -:- 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 561 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