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 Specification: AISI 8620 Low-Alloy Case-Hardening Steel (Annealed Condition)** ### **Product Designation** * **Standard Name:** AISI 8620 / SAE 8620 * **UNS Number:** G86200 * **Condition:** **Annealed** (typically spheroidize annealed for optimal machinability) * **Product Form:** Hot-rolled or cold-finished steel bar * **Specified Size:** **13 mm (0.5 inch) diameter round** * **Global Synonym:** Often referred to as the "workhorse" of case-hardening steels. ### **Overview** AISI 8620 is one of the most widely used and versatile **nickel-chromium-molybdenum low-alloy case-hardening steels** globally. Supplied in the **annealed condition** as a 13 mm (0.5 in.) round, it offers excellent machinability and formability prior to heat treatment. After carburizing (case hardening), it develops an exceptionally hard, wear-resistant surface (case) while maintaining a strong, remarkably tough, and ductile core. This balance of properties makes it the default choice for a vast array of high-strength, high-fatigue components subjected to shock, impact, and bending stresses, particularly in the automotive and general machinery sectors. --- ### **1. Chemical Composition (Typical % by Weight, AISI/SAE Standard)** The Ni-Cr-Mo "triple alloy" system provides an outstanding synergy of core toughness, hardenability, and wear resistance. | Element | Content (%) | Role & Effect | | :--- | :--- | :--- | | **Carbon (C)** | 0.18 - 0.23 | Provides a solid base for core strength while maintaining excellent core toughness. Optimized for carburizing response. | | **Manganese (Mn)** | 0.70 - 0.90 | Increases hardenability and contributes to core strength. | | **Phosphorus (P)** | ≤ 0.035 | Impurity; kept low. | | **Sulfur (S)** | ≤ 0.040 | Impurity; standard low level ensures good transverse ductility and fatigue properties. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer and strengthens the ferrite matrix. | | **Nickel (Ni)** | 0.40 - 0.70 | **The key to superior core toughness.** Enhances ductility and impact strength, especially at low temperatures, and improves hardenability. | | **Chromium (Cr)** | 0.40 - 0.60 | Enhances case hardenability, promotes the formation of hard, wear-resistant carbides in the case, and contributes to core strength. | | **Molybdenum (Mo)** | 0.15 - 0.25 | **Critical for grain control and hardenability.** Refines the grain structure during carburizing, increases core hardenability and strength, and improves tempering resistance. | | **Iron (Fe)** | Balance | | --- ### **2. Physical & Mechanical Properties (Annealed Condition - 13 mm round)** **A. Physical Properties** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Elastic Modulus (E):** ~205 GPa (29.7 x 10⁶ psi) * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** ~51.5 W/m·K * **Coefficient of Thermal Expansion:** 11.5 x 10⁻⁶ /K (20-100°C) **B. Mechanical Properties (As-Annealed)** *Typical for a spheroidize-annealed 13 mm round, ready for machining.* * **Hardness (Brinell):** 149 - 179 HB * **Hardness (Rockwell):** ~80 - 88 HRB * **Tensile Strength:** 500 - 655 MPa (73 - 95 ksi) * **Yield Strength (0.2% Offset):** 365 MPa (53 ksi) min. * **Elongation in 50 mm:** 25% min. * **Machinability:** **Excellent (Good)**. Rated at approximately **65%** of the machinability of a 1.0% carbon steel (1006). The annealed structure allows for good chip breaking and surface finish. * **Surface Finish:** Smooth, suitable for direct machining if cold-drawn; hot-rolled bars may have light scale. **C. Typical Properties After Carburizing & Heat Treatment** *For reference, after carburizing (0.8-1.0mm case depth), quenching, and tempering:* * **Surface Hardness (Case):** 58 - 63 HRC * **Core Hardness:** 25 - 40 HRC (providing a very tough, shock-absorbing support) * **Core Tensile Strength:** 750 - 950 MPa (109 - 138 ksi) * **Core Impact Strength:** Excellent, a defining characteristic of 8620. --- ### **3. Product Applications** The annealed 13 mm round of 8620 is a fundamental stock item for manufacturing a vast range of small to medium-sized precision components. * **Automotive (Highest Volume Use):** * **Gears:** Transmission gears (synchro hubs, sleeves), differential gears and pinions, starter gears, timing gears. * **Shafts:** Camshafts, small axle shafts, transmission shafts, pump shafts. * **Fasteners & Pins:** High-strength bolts, studs, dowel pins, and valve train components. * **Industrial Machinery:** * Gears, pinions, and shafts in gearboxes, reducers, and power tools. * Chain pins, bushings, rollers, and cam followers. * **Aerospace:** * Non-critical gears, actuation system components, and landing gear parts. * **Oil & Gas:** * Valve parts, small tool joints, and drilling equipment components. * **General Engineering:** * Any component requiring a combination of a hard, wear-resistant surface and a tough, durable core. --- ### **4. International Standards & Designations** AISI 8620 is a globally recognized grade with very close equivalents in all major standards. | Standard System | Designation | Notes / Key Comparison | | :--- | :--- | :--- | | **SAE / AISI (USA)** | **SAE 8620** | The universal industry designation. | | **UNS (USA)** | **G86200** | Unified Numbering System. | | **ASTM (USA)** | **ASTM A322** (Grade 8620) | Standard for alloy steel bars. **ASTM A29** covers general requirements. | | **DIN / EN (Germany/EU)** | **1.6523 (20NiCrMo2-2 / 18CrNiMo7-6)** | The **direct equivalent** is **20NiCrMo2-2** (material number 1.6523). 18CrNiMo7-6 is also similar with slightly higher alloy content. | | **JIS (Japan)** | **SNC822** | The **direct Japanese equivalent** (JIS G4102). Slightly different Ni range but functionally identical. | | **GB (China)** | **20CrNiMo** | The **direct Chinese equivalent** (GB/T 3077). | | **ISO** | **ISO 683-11: Type 6** | Designation for Ni-Cr-Mo case-hardening steels. | --- ### **Processing & Advantages of 13 mm Annealed Round** 1. **Optimal Machinability:** The small diameter and soft annealed condition make it ideal for high-speed machining (turning, milling, drilling) on both CNC and manual equipment with excellent chip control. 2. **Versatile Stock Size:** The 13 mm (0.5 in.) round is a standard inventory size, perfect for manufacturing a wide variety of pins, shafts, and small gear blanks. 3. **Predictable Heat Treatment:** The consistent cross-section ensures uniform heating and quenching during subsequent carburizing, leading to reliable case depth and core properties. 4. **Cost-Effectiveness:** Its widespread availability and balanced properties offer the best overall value for a vast majority of case-hardening applications. ### **Summary** **AISI 8620 in annealed 13 mm (0.5 inch) round** is the **quintessential, ready-to-machine form of the world's most popular case-hardening steel**. It provides designers and manufacturers with a reliable, cost-effective, and versatile material that, after carburizing, delivers an exceptional performance combination: a hard, wear-resistant surface backed by one of the toughest cores available in low-alloy steels. Its universal recognition and availability under nearly identical international codes (DIN 1.6523, JIS SNC822, GB 20CrNiMo) make it a truly global engineering standard for durable, high-strength mechanical components. -:- 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 <4148 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 619 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