AISI 8620 Steel Seamless tube

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

AISI 8620 Steel, annealed 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 8620 Steel, Annealed 13 mm (0.5 in.) Round Bar** #### **1. Overview** AISI 8620 is a widely used low-carbon **nickel-chromium-molybdenum alloy steel**, classified as a **case-hardening or carburizing steel**. In the **annealed** condition and supplied as a **13 mm (0.5 inch) diameter round bar**, it is in its softest, most ductile state, optimized for **machinability, cold forming, and subsequent heat treatment**. This form serves as the primary raw material stock for manufacturing components that will later undergo carburizing to achieve a hard, wear-resistant surface while maintaining a tough, ductile core. #### **2. International Standards & Designations** AISI 8620 is recognized under numerous global standards, with the annealed condition specified for procurement and machining. | Region/System | Standard Designation | Title / Purpose | | :--- | :--- | :--- | | **USA (AISI/SAE)** | **AISI 8620, SAE J404** | Standard Chemical Composition | | **USA (ASTM)** | **ASTM A322** | Standard Specification for Steel Bars, Alloy, Standard Grades | | **UNS Number** | **G86200** | Unified Numbering System | | **Europe (EN)** | **1.6523 (20NiCrMo2-2)** | Equivalent Material Designation | | **Germany (DIN)** | **21NiCrMo2** | Equivalent Material Designation | | **Japan (JIS)** | **SNCM220** | Equivalent Material Designation | #### **3. Chemical Composition** The composition is balanced to provide good hardenability for the core after carburizing, with nickel for core toughness and chromium/molybdenum for hardenability and grain refinement. | 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 | #### **4. Mechanical & Physical Properties (Annealed Condition)** The **full anneal** process (typically heated to ~845-870°C / 1550-1600°F and slowly cooled) produces a soft, coarse pearlitic and ferritic microstructure ideal for machining. **Typical Mechanical Properties (13 mm round, Annealed):** * **Hardness:** **149 - 179 HB** (Brinell) or **83 - 88 HRB** (Rockwell B). This is the key property for machinability. * **Ultimate Tensile Strength:** **520 - 655 MPa** (75 - 95 ksi) * **Yield Strength (0.2% Offset):** **385 - 515 MPa** (56 - 75 ksi) * **Elongation in 2 inches:** **22% - 28%** (High ductility) * **Reduction of Area:** **50% - 60%** * **Machinability Rating:** **~65%** (Compared to 100% for B1112 free-machining steel). Good chip formation with proper tools. **Physical Properties:** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Modulus of Elasticity (Young's):** 205 GPa (29,700 ksi) * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** ~45 W/m·K (at 100°C) * **Coefficient of Thermal Expansion:** 12.5 x 10⁻⁶/°C (20-100°C) #### **5. Product Applications** The 13 mm (0.5 in.) annealed round bar is a versatile stock form used across industries to manufacture small to medium-sized precision components destined for case hardening. * **Automotive:** Gears (transmission, differential), pinions, camshafts, shafts, studs, and fasteners. * **Industrial Machinery:** Bushings, couplings, spindles, clutch components, and low-stress shafts. * **Aerospace:** Non-critical linkage components, fittings, and actuator parts. * **Oil & Gas:** Valve components, small tool parts. * **General Fabrication:** Pins, dowels, rollers, and guide rods that require a hard wear surface after machining. #### **6. Key Characteristics & Advantages (as Annealed Stock)** * **Excellent Machinability:** The controlled annealed hardness (HB 149-179) allows for high-speed machining, good surface finish, and extended tool life. * **Superior Formability:** Can be readily cold-drawn, headed, or forged to shape prior to final machining and heat treatment. * **Uniform Consistency:** The round bar form and controlled annealing ensure consistent material properties throughout the length and cross-section. * **Predictable Response to Heat Treatment:** As a standard AISI grade, its response to subsequent carburizing, quenching, and tempering is well-documented and reliable, producing a hard case (up to 60-63 HRC) and a tough core (~25-40 HRC). * **Good Weldability (Pre-HT):** Can be welded with standard techniques, though preheating and post-weld heat treatment are recommended for critical applications. **Conclusion:** **AISI 8620 in the annealed condition, supplied as a 13 mm (0.5 in.) round bar, is the quintessential "blank canvas" for manufacturing high-performance case-hardened components.** Its primary value lies in its **exceptional combination of machinability and predictable response to carburizing heat treatment**. This makes it an economical and reliable choice for engineers and manufacturers producing high-volume, precision parts that must withstand surface wear and contact fatigue while retaining core strength and toughness. The 0.5-inch diameter is particularly suited for automated machining of smaller, intricate parts common in the automotive and general machinery sectors. -:- For detailed product information, please contact sales. -: AISI 8620 Steel, annealed 13 mm (0.5 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <5708 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, annealed 13 mm (0.5 in.) round Properties -:- For detailed product information, please contact sales. -:

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

Packing of AISI 8620 Steel Seamless tube, annealed 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 Seamless tube 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 2179 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