AISI 8617 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 8617 Steel Flange, heat treated, machined, pseudocarburized, 150°C (300°F) temper Product Information -:- For detailed product information, please contact sales. -: AISI 8617 Steel Flange, heat treated, machined, pseudocarburized, 150°C (300°F) temper Synonyms -:- For detailed product information, please contact sales. -:

AISI 8617 Steel, heat treated, machined, pseudocarburized, 150°C (300°F) temper Product Information -:- For detailed product information, please contact sales. -: ## **Product Specification: AISI 8617 Low-Alloy Steel - Pseudocarburized & Tempered Condition** ### **Product Designation** * **Standard Name:** AISI 8617 / SAE 8617 * **UNS Number:** G86170 * **Condition:** **Heat Treated, Machined, & Pseudocarburized** * **Final Temper:** **150°C (300°F)** * **Metallurgical State:** Core microstructure representative of a carburized part's interior, in a finished machined condition. * **Key Feature:** This material simulates the **core properties** of a fully processed carburized component, allowing for precise testing and qualification of the core's mechanical behavior under high-strength, low-toughness conditions. ### **Overview** AISI 8617 is a low-carbon **nickel-chromium-molybdenum alloy steel** primarily designed for **carburizing (case hardening)**. The specified condition—**heat treated, machined, pseudocarburized, and tempered at 150°C (300°F)**—represents a specialized and controlled state. "Pseudocarburization" is a simulation heat treatment that subjects the steel to the high temperature and duration of a carburizing cycle but in a neutral atmosphere, preventing carbon addition. This process replicates the **grain growth and thermal history** of the core region of a real carburized part. Subsequent oil quenching and low-temperature tempering produce a high-strength, low-toughness core microstructure. This precise condition is essential for material qualification, failure analysis, and research into core-dominated failure modes (e.g., bending fatigue, core yielding) in critical components like gears and shafts. --- ### **1. Chemical Composition (Typical % by Weight, AISI/SAE Standard)** The lean carbon content ensures a tough, ductile core after carburizing. | Element | Content (%) | Role & Effect | | :--- | :--- | :--- | | **Carbon (C)** | 0.15 - 0.20 | Provides base strength. Low enough to ensure excellent core toughness after actual carburizing, but sufficient for core hardening during pseudocarburization. | | **Manganese (Mn)** | 0.70 - 0.90 | Enhances core hardenability and solid solution strengthening. | | **Phosphorus (P)** | ≤ 0.035 | Impurity; kept low. | | **Sulfur (S)** | ≤ 0.040 | Impurity; kept low for good transverse properties. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer and strengthens the ferrite matrix. | | **Nickel (Ni)** | 0.40 - 0.70 | **Crucially improves core toughness** and ductility, mitigating brittleness from the high-temperature cycle. | | **Chromium (Cr)** | 0.40 - 0.60 | Increases hardenability and contributes to core strength. | | **Molybdenum (Mo)** | 0.15 - 0.25 | **Critical element.** Enhances hardenability (especially for core properties), provides good tempering resistance, and refines grain structure. | | **Iron (Fe)** | Balance | | --- ### **2. Physical & Mechanical Properties (Pseudocarburized, 150°C Temper)** **A. Physical Properties (Typical)** * **Density:** 7.85 g/cm³ * **Elastic Modulus (E):** ~205 GPa (29.7 x 10⁶ psi) * **Poisson's Ratio:** 0.29 **B. Mechanical Properties (Representative for this Specific Condition)** * **Process Sequence:** Machined to final test specimen dimensions → **Pseudocarburize** (e.g., 925°C / 1700°F for several hours in neutral atmosphere) → **Oil Quench** → **Temper at 150°C / 300°F**. * **Core Hardness:** **40 - 48 HRC**. (High, due to full martensitic transformation from the pseudocarburizing temperature, but lower than a through-hardening steel due to lower carbon content). * **Ultimate Tensile Strength:** **1300 - 1500 MPa (189 - 218 ksi)** * **Yield Strength (0.2% Offset):** **1100 - 1300 MPa (160 - 189 ksi)** * **Elongation:** **~5 - 10%** (Limited ductility due to low-temperature temper and coarse prior austenite grains from high-temperature exposure). * **Reduction of Area:** **~15 - 25%** * **Impact Toughness (Charpy V-notch):** **10 - 25 J (7 - 18 ft-lbf)** at room temperature. **This is the critical property.** The combination of low carbon, high processing temperature (grain coarsening), and low temper results in a **brittle core condition**. This is intentional for testing worst-case scenarios. * **Microstructure:** Tempered martensite, with potentially coarse prior austenite grain boundaries. --- ### **3. Product Applications** This is not a typical "as-purchased" product form. It is a **specially prepared test material or a condition for critical finished components**. * **Research & Development:** * **Core Property Database:** Generating precise S-N (fatigue) curves and fracture toughness data for gear and bearing steel cores. * **Failure Analysis Benchmark:** Providing a baseline material state for investigating field failures where core fatigue or brittle fracture is suspected. * **Aerospace & Automotive Qualification:** * **Material Lot Certification:** Critical aerospace and racing components (e.g., gears, shafts) often require destructive testing of specimens processed identically to the part, including pseudocarburization, to certify core properties meet minimum standards. * **High-Reliability Component Manufacturing:** * **Prototype Testing:** Functional prototypes of safety-critical parts (e.g., helicopter transmission gears) may be manufactured from pre-machined, pseudocarburized stock to validate core performance before final case hardening. * **Test Coupons:** Machined test bars supplied in this condition for customers to perform their own qualification testing. --- ### **4. International Standards & Designations** | Standard System | Designation | Notes / Key Comparison | | :--- | :--- | :--- | | **SAE / AISI (USA)** | **SAE 8617** | The base grade. The specific processing is defined by customer or industry specifications (e.g., AMS, customer drawings). | | **AMS (Aerospace)** | **AMS 6274** (for 8617 steel bars) or similar. | Aerospace standards often govern the required heat treatments and testing for pseudocarburized conditions. | | **ASTM (USA)** | **ASTM A534** | Standard for carburizing steels for anti-friction bearings. Pseudocarburizing is a common test method referenced. | | **DIN / EN (Germany/EU)** | **~1.5752 (15NiCr13)** or **1.6562 (17NiCrMo6-4)** | Similar Ni-Cr-Mo case-hardening steels. The specific "pseudocarburized" condition is a process, not a standard grade. | | **JIS (Japan)** | **SNC815** or **SNC815H** | The closest Japanese equivalents (JIS G4102). | | **GB (China)** | **15CrNiMo** or **20CrNiMo** | Similar Chinese grades. | --- ### **Key Distinctions & Technical Notes** 1. **Pseudocarburizing vs. Actual Carburizing:** Pseudocarburizing exposes the **entire cross-section** to the carburizing temperature and time, resulting in a **uniformly hardened core**. Actual carburizing creates a carbon gradient, leaving a lower-carbon, tougher core than the pseudocarburized condition. 2. **Purpose of Low-Temperature Temper:** The 150°C (300°F) temper is used to relieve quenching stresses with minimal softening, simulating a condition that maximizes core strength (and brittleness) for conservative design testing. 3. **Not a Wear-Resistant Surface:** This condition provides **no effective case**. The surface hardness is the same as the core. It is unsuitable for applications requiring wear resistance unless subsequently case hardened. 4. **Machining Sequence:** The "machined" step occurs *before* pseudocarburizing. This is critical, as the final hardened state is essentially unmachinable. ### **Summary** **AISI 8617 in the heat treated, machined, pseudocarburized, and 150°C tempered condition** is a **highly specialized engineering material state** used for **validation, testing, and research**. It represents the "worst-case" core condition of a carburized component—possessing high strength but significantly reduced ductility and impact toughness due to the thermal cycle. This makes it invaluable for qualifying the performance of safety-critical components in aerospace, automotive, and heavy industry, where understanding and controlling core-driven failure mechanisms is paramount. It is the definitive material for generating reliable design data for bending fatigue and fracture resistance in case-hardened parts. -:- For detailed product information, please contact sales. -: AISI 8617 Steel, heat treated, machined, pseudocarburized, 150°C (300°F) temper Specification Dimensions Size： Diameter 20-1000 mm Length <4146 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 8617 Steel, heat treated, machined, pseudocarburized, 150°C (300°F) temper Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8617 Steel Flange, heat treated, machined, pseudocarburized, 150°C (300°F) temper -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8617 Steel Flange, heat treated, machined, pseudocarburized, 150°C (300°F) temper -:- For detailed product information, please contact sales. -:

Packing of AISI 8617 Steel Flange, heat treated, machined, pseudocarburized, 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 617 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