AISI 8622 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 8622 Steel Flange, heat treated, machined to 25 mm (1 in.) rounds, pseudocarburized, 775°C (1430°F) reheat, 150°C (300°F) temper Product Information -:- For detailed product information, please contact sales. -: AISI 8622 Steel Flange, heat treated, machined to 25 mm (1 in.) rounds, pseudocarburized, 775°C (1430°F) reheat, 150°C (300°F) temper Synonyms -:- For detailed product information, please contact sales. -:

AISI 8622 Steel, heat treated, machined to 25 mm (1 in.) rounds, pseudocarburized, 775°C (1430°F) reheat, 150°C (300°F) temper Product Information -:- For detailed product information, please contact sales. -: ## **Product Specification: AISI 8622 Low-Alloy Steel - Simulated Core & Tempered Martensite Condition** ### **Product Designation** * **Standard Name:** AISI 8622 / SAE 8622 * **UNS Number:** G86220 * **Condition:** **Heat Treated, Machined, Pseudocarburized, Reheated & Tempered** * **Key Thermal Cycle:** 1. **Pseudocarburizing:** Simulated case-hardening thermal exposure (neutral atmosphere) 2. **Reheat:** **775°C (1430°F)** - Intercritical Anneal/Austenitization 3. **Final Temper:** **150°C (300°F)** - Low-Temperature Stress Relief * **Product Form:** **25 mm (1 inch) diameter round**, machined to final test specimen dimensions. * **Metallurgical State:** Represents a **refined, high-strength core microstructure** achievable after a specific heat treatment variant of a carburized part. ### **Overview** AISI 8622 is a low-carbon nickel-chromium-molybdenum steel, similar to 8620 but with slightly lower carbon for enhanced core toughness. The specified complex heat treatment creates a highly controlled material state for advanced engineering evaluation. Unlike a standard pseudocarburizing treatment that quenches directly from the high carburizing temperature, this process includes a **critical reheat to 775°C (1430°F)**. This temperature is typically within the **intercritical range** (ferrite + austenite phase field), allowing for refinement of the prior austenite grains and microstructure before final quenching and tempering. The result is a test material that provides data on a core with optimized strength-toughness balance for the highest-performance applications. --- ### **1. Chemical Composition (Typical % by Weight, AISI/SAE Standard)** | Element | Content (%) | Role & Effect | | :--- | :--- | :--- | | **Carbon (C)** | 0.20 - 0.25 | Slightly higher than 8620, providing a stronger core base while maintaining good toughness. | | **Manganese (Mn)** | 0.70 - 0.90 | Enhances hardenability. | | **Phosphorus (P)** | ≤ 0.035 | Impurity; kept low. | | **Sulfur (S)** | ≤ 0.040 | Impurity; kept low. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer and solid solution strengthener. | | **Nickel (Ni)** | 0.40 - 0.70 | Improves core toughness and hardenability. | | **Chromium (Cr)** | 0.40 - 0.60 | Enhances hardenability and contributes to strength. | | **Molybdenum (Mo)** | 0.15 - 0.25 | Provides grain refinement, increases hardenability and tempering resistance. | | **Iron (Fe)** | Balance | | --- ### **2. Physical & Mechanical Properties (After Specified Thermal Cycle)** **A. Physical Properties (Estimated)** * **Density:** 7.85 g/cm³ * **Elastic Modulus (E):** ~205 GPa (29.7 x 10⁶ psi) **B. Mechanical Properties (Representative for this Specific Condition)** * **Process Sequence:** 1. Machine to 25 mm round test specimen. 2. **Pseudocarburize:** High-temperature soak (e.g., 925°C / 1700°F) to simulate carburizing cycle. 3. **Reheat to 775°C (1430°F):** This step **refines the microstructure**. It dissolves some carbides and creates a finer, more uniform austenite grain structure compared to the coarse grains from the pseudocarburizing step alone. 4. **Oil Quench** from 775°C. 5. **Temper at 150°C (300°F).** * **Core Hardness:** **45 - 52 HRC**. Higher than a standard pseudocarburized 8620 core due to the higher carbon content of 8622 and the refined martensite from the reheat. * **Ultimate Tensile Strength:** **1450 - 1650 MPa (210 - 239 ksi)** * **Yield Strength (0.2% Offset):** **1250 - 1450 MPa (181 - 210 ksi)** * **Elongation:** **~5 - 10%** * **Reduction of Area:** **~20 - 30%** * **Impact Toughness (Charpy V-notch):** **20 - 35 J (15 - 26 ft-lbf)**. **Expected to be superior** to a direct pseudocarburized & tempered condition due to the grain-refining effect of the 775°C reheat. * **Microstructure:** Fine, tempered martensite with a refined prior austenite grain size. --- ### **3. Product Applications** This is a **specialized test material condition** used for advanced research, development, and qualification of ultra-high-performance components. * **Aerospace & Defense Gear Development:** * **Process Optimization:** Studying the benefits of intercritical reheats (sometimes called "refine heats" or "intermediate quenching") on the core properties of critical gearing for helicopter transmissions and jet engine accessories. * **High-Cycle Fatigue Testing:** Generating core fatigue data (S-N curves) for components where weight savings demand the highest possible strength with adequate toughness. * **High-Performance Motorsports:** * **Material & Process Benchmarking:** Evaluating non-standard heat treatment cycles for transmission and differential gears in Formula 1, IndyCar, or endurance racing to push the limits of core performance. * **Advanced Bearing Research:** * **Core-Initiated Fatigue Studies:** Understanding failure mechanisms in large, heavily loaded bearings where core properties are limiting, and improved heat treatments are sought. * **Academic & Industrial Research:** * **Microstructure-Property Relationships:** Fundamental studies on the effect of intercritical heat treatments on the toughness of low-alloy steel martensite. --- ### **4. International Standards & Designations** | Standard System | Designation | Notes / Key Comparison | | :--- | :--- | :--- | | **SAE / AISI (USA)** | **SAE 8622** | The base grade designation. The thermal cycle is an experimental or proprietary specification. | | **UNS (USA)** | **G86220** | Unified Numbering System. | | **ASTM (USA)** | **ASTM A534** | Relevant standard for carburizing bearing steels, though this specific cycle is non-standard. | | **DIN / EN (Germany/EU)** | **~1.6523 (20NiCrMo2-2)** or **1.6562 (17NiCrMo6-4)** | Similar base grades. The 775°C reheat process may be analogous to a *"Zwischenstufenvergütung"* (intermediate quenching) practice. | | **JIS (Japan)** | **SNC822** | Similar Japanese grade. | | **GB (China)** | **20CrNiMo** or **22CrNiMo** | Similar Chinese grades. | --- ### **Technical Significance of the 775°C Reheat** 1. **Grain Refinement:** The primary purpose. Quenching directly from the pseudocarburizing temperature (~925°C) results in coarse prior austenite grains, which can harm toughness. The 775°C reheat starts from a finer, partially transformed structure, leading to a much finer final austenite grain size upon reheating. 2. **Carbide Modification:** Helps dissolve and redistribute coarse carbides that may have formed during the slow cool from the pseudocarburizing temperature or during the reheat itself. 3. **Strength/Toughness Optimization:** This specific thermal path aims to achieve a higher strength level than standard treatment while **preserving more toughness** than would be possible with a direct high-temperature quench and low temper. It represents a tailored, high-performance heat treatment strategy. ### **Summary** **AISI 8622 steel, processed to the specified "pseudocarburize + 775°C reheat + 150°C temper" condition in 25 mm rounds, represents a sophisticated, non-standard heat treatment state for advanced engineering evaluation.** It is not a commercial product but a **research and development artifact**. This process simulates an optimized core condition that prioritizes both high strength and improved toughness through microstructural refinement. Its use is confined to laboratories and qualification programs for the most demanding applications—such as aerospace gearing and elite motorsports—where incremental gains in core performance are critical and justify complex thermal processing. This condition highlights the nuanced interplay between heat treatment path and final properties in high-performance alloy steels. -:- For detailed product information, please contact sales. -: AISI 8622 Steel, heat treated, machined to 25 mm (1 in.) rounds, pseudocarburized, 775°C (1430°F) reheat, 150°C (300°F) temper Specification Dimensions Size： Diameter 20-1000 mm Length <4150 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 8622 Steel, heat treated, machined to 25 mm (1 in.) rounds, pseudocarburized, 775°C (1430°F) reheat, 150°C (300°F) temper Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8622 Steel Flange, heat treated, machined to 25 mm (1 in.) rounds, pseudocarburized, 775°C (1430°F) reheat, 150°C (300°F) temper -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8622 Steel Flange, heat treated, machined to 25 mm (1 in.) rounds, pseudocarburized, 775°C (1430°F) reheat, 150°C (300°F) temper -:- For detailed product information, please contact sales. -:

Packing of AISI 8622 Steel Flange, heat treated, machined to 25 mm (1 in.) rounds, pseudocarburized, 775°C (1430°F) reheat, 150°C (300°F) temper -:- 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 621 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