AISI 8620 Steel, normalized

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

AISI 8620 Steel, normalized, 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 8620 Steel, Normalized, 13 mm (0.5 in.) Round Bar** #### **1. Overview** AISI 8620 is a versatile low-carbon **nickel-chromium-molybdenum alloy steel** classified as a **case-hardening (carburizing) steel**. In the **normalized** condition, supplied as a **13 mm (0.5 inch) diameter round bar**, the material exhibits a refined, uniform microstructure achieved through controlled air cooling from above its critical temperature. This condition provides an optimal balance of **enhanced mechanical properties, good machinability, and dimensional stability**, serving as superior raw material stock for components requiring both precise fabrication and consistent response to subsequent carburizing heat treatment. #### **2. International Standards & Designations** AISI 8620 is recognized globally with equivalent designations; the normalized condition is typically specified for improved consistency in demanding applications. | Region/System | Standard Designation | Specification Focus | | :--- | :--- | :--- | | **USA (AISI/SAE)** | **AISI 8620, SAE J404** | Chemical Composition Standard | | **USA (ASTM)** | **ASTM A322** | Steel Bars, Alloy, Standard Grades | | **UNS Number** | **G86200** | Unified Numbering System | | **Europe (EN)** | **1.6523 / 20NiCrMo2-2** | Equivalent Material Standard | | **Germany (DIN)** | **21NiCrMo2** | Equivalent Designation | | **Japan (JIS)** | **SNCM220** | Equivalent Material Standard | | **Heat Treatment Ref.** | **AMS 2759/1** | Pyrometry Standard for Controlled Processing | #### **3. Chemical Composition** The alloy composition is engineered to provide excellent core hardenability and toughness after final heat treatment, with precise elemental ranges ensuring consistent performance. | Element | Content (% by Weight) | | :--- | :--- | | **Carbon (C)** | 0.18 - 0.23 | | **Manganese (Mn)** | 0.70 - 0.90 | | **Phosphorus (P)** | ≤ 0.035 | | **Sulfur (S)** | ≤ 0.040 | | **Silicon (Si)** | 0.15 - 0.35 | | **Nickel (Ni)** | 0.40 - 0.70 | | **Chromium (Cr)** | 0.40 - 0.60 | | **Molybdenum (Mo)** | 0.15 - 0.25 | | **Iron (Fe)** | Balance | **Key Metallurgical Note:** The molybdenum content inhibits grain growth during normalization and subsequent high-temperature carburizing, ensuring a fine-grained microstructure. #### **4. Mechanical & Physical Properties (Normalized Condition)** The normalization process (typically heated to ~900-925°C / 1650-1700°F and uniformly air-cooled) produces a fine, homogeneous pearlitic-ferritic structure. **Typical Mechanical Properties (13 mm round, Normalized):** * **Hardness:** **179 - 217 HB** (Brinell) or **88 - 95 HRB** (Rockwell B). This provides improved strength over the annealed condition while maintaining good machinability. * **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%** * **Reduction of Area:** **45% - 55%** * **Machinability Rating:** **~60%** (Compared to 100% for B1112 steel). Slightly less machinable than annealed 8620 but offers better consistency and chip control. * **Microstructure:** Fine, uniform distribution of pearlite in a ferrite matrix, typically ASTM grain size 6-8. **Physical Properties:** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Modulus of Elasticity:** 205 GPa (29,700 ksi) * **Shear Modulus:** 80 GPa (11,600 ksi) * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** 46.6 W/m·K (at 100°C) * **Coefficient of Thermal Expansion:** 12.3 × 10⁻⁶/°C (20-100°C) #### **5. Product Applications** The normalized 13 mm round bar is preferred for applications requiring more consistent mechanical properties and better dimensional stability during machining than the annealed condition provides. * **Precision Gearing Systems:** Transmission gears, differential pinions, and timing gears where uniform stock material ensures consistent case depth and minimal distortion during carburizing. * **Automotive Components:** Camshafts, crankshafts, high-strength fasteners, and bearing races requiring reliable core properties. * **Aerospace Fittings:** Linkage components, actuator parts, and mounting brackets where material consistency is critical. * **Hydraulic/Pneumatic Components:** Piston rods, valve spools, and pump gears requiring good machined surface finish. * **Tooling & Fixtures:** Jigs, fixtures, and machine tool components that benefit from the normalized condition's stability and uniformity. #### **6. Key Characteristics & Advantages** * **Superior Microstructural Uniformity:** Normalization eliminates the coarse grain structure sometimes found in as-rolled or annealed material, ensuring consistent machining behavior and heat treatment response across the entire bar length and cross-section. * **Enhanced Mechanical Consistency:** Provides more predictable and uniform tensile strength, yield strength, and hardness compared to as-rolled or annealed conditions, leading to more reliable component performance. * **Optimal Balance for Machining:** Offers improved chip formation and better surface finish over as-rolled material, with less tool wear variation during high-volume production runs. * **Improved Dimensional Stability:** The stress-relieving effect of normalization minimizes subsequent distortion during machining and provides a more stable foundation for final heat treatment. * **Excellent Hardenability Foundation:** The refined grain structure from normalization promotes better and more uniform core properties after carburizing and quenching, enhancing final component fatigue strength and impact resistance. * **Cost-Effective Premium Stock:** Provides many benefits of pre-conditioned material without the significant cost increase of annealed or pre-hardened grades. **Conclusion:** **AISI 8620 in the normalized condition as a 13 mm (0.5 in.) round bar represents the optimal starting material for manufacturers of high-precision, case-hardened components.** It bridges the gap between the superior machinability of annealed stock and the enhanced mechanical consistency required for critical applications. The normalized state ensures **uniform microstructure, predictable machining characteristics, and reliable response to subsequent carburizing**, making it the preferred choice for automotive, aerospace, and industrial components where dimensional accuracy, performance consistency, and production efficiency are paramount. For components requiring the highest level of property uniformity and minimal heat treatment distortion, normalized AISI 8620 provides a technically and economically advantageous solution over conventional annealed material. -:- For detailed product information, please contact sales. -: AISI 8620 Steel, normalized, 13 mm (0.5 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <5709 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 8620 Steel, normalized, 13 mm (0.5 in.) round Properties -:- For detailed product information, please contact sales. -:

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

Packing of AISI 8620 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 2180 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