AISI 8620H Steel, normalized

AISI 8620H Steel, normalized, 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: AISI 8620H Steel, normalized, 13 mm (0.5 in.) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 8620H Steel, normalized, 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 8620H Steel, Normalized, 13 mm (0.5 in.) Round Bar** #### **1. Overview** AISI 8620H is a **hardenability-controlled (H-grade)** variant of the nickel-chromium-molybdenum case-hardening steel. Supplied as a **normalized 13 mm (0.5 inch) diameter round bar**, this material represents a premium, pre-conditioned stock designed for **high-volume manufacturing of precision components**. The "H" designation guarantees a narrow, specified range of hardenability as defined by end-quench (Jominy) test data. The normalization process refines the grain structure, enhances mechanical uniformity, and provides a superior foundation for machining and subsequent carburizing heat treatment. This combination delivers **exceptional consistency in both manufacturing and final performance** for critical, mass-produced parts. #### **2. International Standards & Designations** This product conforms to strict international standards governing both hardenability and material condition. | Region/System | Standard Designation | Title / Purpose | | :--- | :--- | :--- | | **USA (AISI/SAE)** | **AISI 8620H, SAE J404 & J1268** | Chemical Composition & Hardenability Bands | | **USA (ASTM)** | **ASTM A304** | Alloy Steel Bars Subject to End-Quench Hardenability Requirements | | **UNS Number** | **H86200** | Unified Numbering System for H-Steels | | **Dimensional Standard** | **ASTM A29/A29M** | General Requirements for Steel Bars | | **Heat Treatment Process** | **SAE AMS-H-6875** | Heat Treatment of Steel, General Requirements | | **Europe (EN)** | **1.6523H (20NiCrMo2-2H)** | Hardenability-controlled Equivalent | #### **3. Chemical Composition & Hardenability Guarantee** The composition is tightly controlled to ensure the hardenability falls within the mandated "H-band," guaranteeing predictable core properties after final heat treatment. **Core Composition (% by Weight, AISI 8620H):** | Element | Content Range | Role in Normalized H-Steel | | :--- | :--- | :--- | | **Carbon (C)** | 0.17 - 0.23 | Base strength; forms fine pearlite during normalization. | | **Manganese (Mn)** | 0.60 - 0.95 | Primary hardenability agent; fine-tuned to hit H-band targets. | | **Phosphorus (P)** | ≤ 0.035 | Impurity control. | | **Sulfur (S)** | ≤ 0.040 | Impurity control. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer; strengthens ferrite. | | **Nickel (Ni)** | 0.35 - 0.75 | Enhances core toughness and hardenability. | | **Chromium (Cr)** | 0.35 - 0.65 | Increases hardenability; refines microstructure. | | **Molybdenum (Mo)** | 0.15 - 0.25 | Strong hardenability agent; inhibits grain growth during normalization. | **Guaranteed Hardenability (The "H" Advantage):** The steel is certified to have a Jominy end-quench curve within a specified narrow band. For a 13 mm round, this guarantees that after carburizing and quenching, the **core hardness will be highly predictable and uniform**, regardless of production lot or minor chemistry fluctuations within the range. #### **4. Mechanical & Physical Properties (Normalized Condition)** Normalization (heated to ~900-925°C and air-cooled) produces a fine, homogeneous ferritic-pearlitic structure with enhanced consistency. **Typical As-Normalized Properties:** * **Hardness:** **179 - 217 HB** (Brinell) or **88 - 95 HRB**. Slightly higher and more uniform than annealed stock, providing excellent machinability with better chip control. * **Ultimate Tensile Strength (UTS):** **620 - 795 MPa** (90 - 115 ksi) * **Yield Strength (0.2% Offset):** **415 - 585 MPa** (60 - 85 ksi) * **Elongation in 2 inches:** **18% - 22%** * **Machinability Rating:** **~60%** (of B1112 steel). Offers superior consistency in tool wear and surface finish for automated production. * **Microstructure:** Fine, uniformly distributed pearlite in a ferrite matrix. Prior austenite grain size typically ASTM 7-8. * **Impact Toughness:** Good, providing a reliable base for further processing. **Physical Properties:** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Modulus of Elasticity:** 205 GPa (29,700 ksi) * **Coefficient of Thermal Expansion:** 12.3 x 10⁻⁶/°C #### **5. Product Applications** This material is specified for high-volume, precision components where dimensional stability and core property consistency are critical. * **Automotive Transmission Components:** High-volume gears, synchronizer hubs, and shift forks where uniform core hardness ensures consistent noise performance and fatigue life. * **Precision Bearing Races:** Components for mass-produced bearings requiring predictable load capacity and dimensional stability. * **Fuel System Components:** High-pressure pump gears and injector parts demanding consistent material behavior. * **Fasteners and Critical Pins:** Dowel pins, valve guides, and other precision-fit parts where batch-to-b uniformity is essential for assembly and function. * **Hydraulic and Pneumatic Parts:** Valves and pump components produced in large batches with automated machining. #### **6. Key Characteristics & Advantages** * **Predictable Core Properties Post-HT:** The **primary advantage**. The guaranteed H-band ensures that after carburizing, the core hardness and strength of every part will fall within a narrow, predictable range, leading to uniform performance and extended product life. * **Superior Manufacturing Consistency:** The normalized condition provides more uniform hardness and microstructure than annealed or as-rolled stock, resulting in consistent machining behavior, predictable tool life, and minimal part-to-part variation in CNC operations. * **Optimal Dimensional Stability:** Normalization relieves internal stresses from rolling, providing a stable starting condition that minimizes distortion during rough machining and subsequent heat treatment. * **Enhanced Quality for High-Volume Production:** Dramatically reduces the statistical risk of heat treatment outliers, minimizing scrap and rework in large batch production. * **Streamlined Supply Chain & Process Control:** Allows heat treaters to use standardized recipes with confidence, improving overall process capability (Cpk) and reducing quality inspection overhead. **Conclusion:** **AISI 8620H in the normalized 13 mm round bar condition represents the pinnacle of production-ready material for high-volume, precision case-hardened components.** It synergistically combines the **microstructural benefits of normalization** with the **predictability guarantees of H-grade chemistry**. This product is not merely purchased steel; it is a **manufacturing solution** that de-risks production, enhances quality, and ensures the reliable performance of critical components in automotive, bearing, and hydraulic systems. For engineers and manufacturers seeking to eliminate variability and maximize efficiency in mass production, this material provides a foundational advantage that translates directly to higher quality and lower total cost. -:- For detailed product information, please contact sales. -: AISI 8620H Steel, normalized, 13 mm (0.5 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <5725 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 8620H Steel, normalized, 13 mm (0.5 in.) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8620H Steel, normalized, 13 mm (0.5 in.) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8620H Steel, normalized, 13 mm (0.5 in.) round -:- For detailed product information, please contact sales. -:

Packing of AISI 8620H Steel, normalized, 13 mm (0.5 in.) round -:- 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 2196 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