AISI 8620 Steel Flange

1,We Manufacturing processes are primarily classified into four types: 1:Forging, 2:Casting, 3:Cutting, 4:Rolling. 2,We can manufacture in accordance with these standards. Standards: GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards). Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others. The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500. Flange Classification 1. **According to Chemical Industry Standards:** Flanges are classified as follows: Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)). 2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows: Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation). 3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows: Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange. 4. **According to Connection Method/Type:** Flanges are classified as follows: Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc. 5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges. 6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges. A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts." -:- For detailed product information, please contact sales. -: AISI 8620 Steel Flange, annealed 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: AISI 8620 Steel Flange, 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 Flange, annealed 13 mm (0.5 in.) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8620 Steel Flange, annealed 13 mm (0.5 in.) round -:- For detailed product information, please contact sales. -:

Packing of AISI 8620 Steel Flange, 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 Flange 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