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

AISI 8620H Steel, annealed 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 8620H Steel, Annealed 13 mm (0.5 in.) Round Bar** #### **1. Overview** AISI 8620H is a **hardenability-controlled (H-grade)** variant of the standard AISI 8620 low-carbon nickel-chromium-molybdenum alloy steel. Supplied as an **annealed 13 mm (0.5 inch) diameter round bar**, this material represents a premium-grade raw stock engineered for **exceptional consistency in mass production**. The "H" designation guarantees that the steel's hardenability—its ability to form martensite to a certain depth upon quenching—falls within a specified, narrow range as defined by end-quench (Jominy) test data. In the annealed state, it offers **optimal machinability and formability**, providing manufacturers with a highly predictable material that will yield uniform core properties in finished, case-hardened components. #### **2. International Standards & Designations** AISI 8620H is defined by standards that specifically govern its hardenability, ensuring batch-to-batch consistency. | Region/System | Standard Designation | Title / Purpose | | :--- | :--- | :--- | | **USA (AISI/SAE)** | **AISI 8620H, SAE J404 & J1268** | Chemical Composition & Hardenability Bands | | **USA (ASTM)** | **ASTM A304** | Standard Specification for Carbon and 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 | | **Europe (EN)** | **1.6523H (20NiCrMo2-2H)** | Equivalent Material Designation (Hardenability-controlled) | | **Heat Treatment Ref.** | **SAE AMS-H-6875** | Heat Treatment of Steel, General Requirements | #### **3. Chemical Composition & Hardenability Guarantee** The chemical composition range for 8620H is similar to standard 8620 but is more tightly controlled to ensure the hardenability falls within the mandated "H-band." The key value is the predictable Jominy curve. **Core Composition (% by Weight, Typical AISI 8620H):** | Element | Content Range | Role in H-Steel | | :--- | :--- | :--- | | **Carbon (C)** | 0.17 - 0.23 | Provides base strength; content controlled to fine-tune hardenability. | | **Manganese (Mn)** | 0.60 - 0.95 | Major hardenability agent; range adjusted to hit H-band targets. | | **Phosphorus (P)** | ≤ 0.035 | Impurity control. | | **Sulfur (S)** | ≤ 0.040 | Impurity control. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer. | | **Nickel (Ni)** | 0.35 - 0.75 | Enhances core toughness and hardenability. | | **Chromium (Cr)** | 0.35 - 0.65 | Increases hardenability; range optimized for band control. | | **Molybdenum (Mo)** | 0.15 - 0.25 | Strong hardenability agent; refines grain. | **Guaranteed Hardenability (Key Feature):** The steel is purchased against a guaranteed range of hardness values at specific distances on the Jominy end-quench test bar. For 8620H, a typical hardness range at the standard Jominy positions (e.g., J6, J10, J20) is specified, ensuring that the **core hardness after carburizing and quenching will be predictable and consistent**, regardless of the production heat. #### **4. Mechanical & Physical Properties (Annealed Condition, 13 mm round)** The full anneal process provides a soft, uniform microstructure ideal for precision machining. **Typical As-Annealed Properties:** * **Hardness:** **149 - 179 HB** (Brinell) or **83 - 88 HRB** (Rockwell B). Consistent with standard 8620 for excellent machinability. * **Ultimate Tensile Strength (UTS):** **520 - 655 MPa** (75 - 95 ksi) * **Yield Strength (0.2% Offset):** **385 - 515 MPa** (56 - 75 ksi) * **Elongation in 2 inches:** **22% - 28%** * **Machinability Rating:** **~65%** (of B1112 steel). Offers excellent chip control and surface finish for a low-alloy steel. * **Microstructure:** Coarse pearlite and ferrite. **Physical Properties:** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Modulus of Elasticity:** 205 GPa (29,700 ksi) * **Poisson's Ratio:** 0.29 * **Coefficient of Thermal Expansion:** 12.5 x 10⁻⁶/°C (20-100°C) #### **5. Product Applications** The 13 mm (0.5 in.) annealed 8620H round bar is specified for high-volume, precision components where **consistency in final heat-treated properties is non-negotiable**. * **High-Volume Automotive Components:** Transmission gears, pinions, camshafts, and fuel injection components where thousands of parts must have identical core hardness and case depth after processing. * **Precision Bearing Components:** Races and rollers for mass-produced bearings requiring uniform load-bearing capacity. * **Fasteners and Pins:** Critical dowel pins, bolts, and studs in engines and transmissions where consistent strength is vital for clamping force and fatigue life. * **Hydraulic and Pneumatic Parts:** Pump gears, valve spools, and piston rods produced in large batches. * **Consumer Appliances and Power Tools:** High-stress gearing and shafts where reliable performance is expected from every unit. #### **6. Key Characteristics & Advantages (as Annealed H-Grade Stock)** * **Unmatched Consistency in Final Properties:** The primary advantage. Guarantees that the core hardness after carburizing and quenching will be uniform from part-to-part and batch-to-batch, leading to predictable performance and fatigue life. * **Reduced Production Scrap and Rework:** Eliminates the risk of a whole heat of steel falling outside acceptable core hardness limits after heat treatment, a common risk with standard grades. * **Optimized for Automated, High-Volume Machining:** The consistent annealed hardness ensures predictable tool wear, chip formation, and cycle times in CNC machining centers, maximizing production efficiency. * **Superior Quality for Critical Designs:** Enables engineers to design to tighter safety margins, knowing the material's response to heat treatment is guaranteed. * **Simplified Heat Treatment Process Control:** With hardenability variation minimized, heat treaters can use more consistent time-temperature parameters, improving overall process capability (Cpk). **Conclusion:** **AISI 8620H in the annealed 13 mm round bar form is the choice of discerning manufacturers for high-volume, critical component production.** It transcends being merely a raw material to become a **reliability and consistency engineering solution**. While chemically similar to standard 8620, the "H" designation and its guaranteed hardenability band provide an essential layer of quality assurance, **dramatically reducing variability in the final hardened product**. For applications in the automotive, bearing, and other high-volume precision industries, the use of 8620H is a strategic investment that pays dividends in reduced scrap, fewer processing issues, and ultimately, more reliable end products. The 0.5-inch diameter is perfectly suited for automated machining of a vast array of small, high-precision parts that form the backbone of modern mechanical systems. -:- For detailed product information, please contact sales. -: AISI 8620H Steel, annealed 13 mm (0.5 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <5724 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, annealed 13 mm (0.5 in.) round Properties -:- For detailed product information, please contact sales. -:

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

Packing of AISI 8620H 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 2195 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