AISI 8615 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 8615 Steel Flange, heat treated, 150°C (300°F) temper, 25 mm bar Product Information -:- For detailed product information, please contact sales. -: AISI 8615 Steel Flange, heat treated, 150°C (300°F) temper, 25 mm bar Synonyms -:- For detailed product information, please contact sales. -:

AISI 8615 Steel, heat treated, 150°C (300°F) temper, 25 mm bar Product Information -:- For detailed product information, please contact sales. -: ## **Product Specification: AISI 8615 Case-Hardening Steel, Heat Treated Condition** ### **Product Designation** * **Standard Name:** AISI 8615 / SAE 8615 * **UNS Number:** G86150 * **Condition:** **Heat Treated (Through-Hardened & Tempered)** * **Tempering Temperature:** **150°C (300°F) - Low-Temperature Temper** * **Product Form & Size:** **25 mm (1 inch) diameter bar** * **Core Microstructure:** Tempered martensite (high-strength, moderate toughness) * **Surface Condition:** May be descaled or machined post-treatment; suitable for final grinding or as-is for certain applications. ### **Overview** AISI 8615 is a low-carbon, **nickel-chromium-molybdenum low-alloy steel** renowned for its excellent core toughness and case hardenability. Supplied in this specific **heat-treated condition—through-hardened and tempered at 150°C (300°F)**—the 25 mm bar possesses a very high-strength, wear-resistant core throughout its entire cross-section. This low-temperature temper primarily relieves quenching stresses while retaining maximum hardness and strength, making the product ideal for applications demanding extreme core strength and moderate toughness, often prior to or without a subsequent case-hardening (carburizing) process. --- ### **1. Chemical Composition (Typical % by Weight, AISI/SAE Standard)** The Ni-Cr-Mo combination provides a superb balance of strength, hardenability, and toughness. | Element | Content (%) | Role & Effect | | :--- | :--- | :--- | | **Carbon (C)** | 0.13 - 0.18 | Provides base core strength. This level allows for good through-hardenability in a 25mm section while retaining superior toughness compared to higher-carbon steels. | | **Manganese (Mn)** | 0.70 - 0.90 | Enhances 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 | **Significantly improves core toughness and ductility**, especially at low temperatures. Also enhances hardenability. | | **Chromium (Cr)** | 0.40 - 0.60 | Increases hardenability and wear resistance. Contributes to solid solution strengthening. | | **Molybdenum (Mo)** | 0.15 - 0.25 | **Key element.** Increases hardenability (particularly for core strength), improves tempering resistance, and enhances strength at elevated temperatures. | | **Iron (Fe)** | Balance | | --- ### **2. Physical & Mechanical Properties (25 mm Bar, 150°C Tempered)** **A. Physical Properties (Estimated)** * **Density:** 7.85 g/cm³ * **Elastic Modulus (E):** ~205 GPa (29.7 x 10⁶ psi) * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** ~42 W/m·K (lower due to hardened state) * **Coefficient of Thermal Expansion:** 11.5 x 10⁻⁶ /K **B. Mechanical Properties (Typical for Specified Condition)** * **Heat Treatment Process:** Austenitized (~850-870°C / 1560-1600°F), **Oil Quenched**, Tempered at **150°C / 300°F**. * **Core Hardness:** **50 - 55 HRC** (Very high, characteristic of a low temper). * **Ultimate Tensile Strength:** **1650 - 1850 MPa (239 - 268 ksi)** * **Yield Strength (0.2% Offset):** **1400 - 1600 MPa (203 - 232 ksi)** * **Elongation in 50 mm:** **~8 - 12%** (Limited ductility due to high hardness). * **Reduction of Area:** **~25 - 35%** * **Impact Toughness (Charpy V-notch):** **20 - 35 J (15 - 26 ft-lbf)** at room temperature. While lower than in a toughened state, this is relatively good for this hardness level due to the Ni-Cr-Mo alloying. * **Key Characteristic:** Extremely high strength and good wear resistance, with acceptable toughness for its hardness, suitable for high-stress, non-impact applications. --- ### **3. Product Applications** This specific high-strength condition of AISI 8615 is used for components that require a very hard, strong core that is often finished by grinding, or used as-is for wear parts. * **Tooling & Machine Components:** * **Shanks & Collets:** For tool holders, arbors, and collets requiring high rigidity and wear resistance. * **Precision Shafts & Spindles:** For high-speed, low-deflection applications in machine tools. * **Wear Parts:** Guides, slides, and non-cutting tool components subject to abrasion. * **Automotive & Racing:** * **High-Stress Pins & Bushings:** Such as king pins, linkage pins, or suspension bushings where wear is critical. * **Valve Train Components:** Pushrods or adjusters in high-performance engines. * **Fluid Power:** * **Hydraulic Cylinder Rods (for specific services):** Where extreme hardness is required for wear and corrosion resistance in non-impact environments. * **Aerospace:** * **Non-Critical High-Strength Fasteners & Pins:** Where weight and strength are key, and the part is not subject to high shock loads. * **Base Material for Further Processing:** This bar can serve as a pre-hardened core material for components that will later undergo **localized surface hardening** (e.g., induction hardening) on specific wear surfaces. --- ### **4. International Standards & Designations** | Standard System | Designation | Notes / Key Comparison | | :--- | :--- | :--- | | **SAE / AISI (USA)** | **SAE 8615** | The base grade designation. The heat-treated condition is a purchase specification. | | **UNS (USA)** | **G86150** | Unified Numbering System. | | **ASTM (USA)** | **ASTM A322** (Grade 8615) | Standard for alloy steel bars. The heat treatment would be a supplementary requirement (SR). | | **DIN / EN (Germany/EU)** | **~1.5752 (15NiCr13)** or **1.6523 (18CrMo4)** | Similar Ni-Cr or Cr-Mo case-hardening steels. A direct equivalent to this specific hardened condition is not standardized. | | **JIS (Japan)** | **SNC815** | The closest Japanese equivalent (JIS G4102). | | **GB (China)** | **15CrNiMo** or **20CrNiMo** | Similar Chinese grades with Ni-Cr-Mo composition. | --- ### **Processing & Design Considerations** 1. **Machinability:** **Very poor in this condition.** Material must be machined prior to heat treatment. Final shaping requires abrasive processes (grinding) or hard turning with appropriate tooling. 2. **Weldability:** **Not recommended.** The high carbon equivalent and existing martensitic structure make it extremely prone to cracking in the HAZ. Any welding would require complete re-austenitization and tempering. 3. **Dimensional Stability:** The low-temperature temper provides minimal stress relief. Subsequent grinding or machining operations must be controlled to avoid distortion or introducing new stresses. 4. **Toughness-Softening Trade-off:** If higher impact toughness is required, the bar must be retempered at a higher temperature (e.g., 425-650°C / 800-1200°F), which will reduce hardness and strength proportionally. ### **Summary** **AISI 8615 steel, heat treated with a 150°C (300°F) temper in 25 mm bar form**, is a **specialized, high-performance material** offering an exceptional combination of **core hardness (50-55 HRC) and ultra-high tensile strength (1650+ MPa)**. It leverages the superior alloy design of the Ni-Cr-Mo system to provide usable toughness at a hardness level where most steels would be brittle. This product is not a general-purpose bar but a precision-engineered solution for demanding applications requiring extreme wear resistance, rigidity, and strength, typically in finished or near-net-shape components where no further heavy machining is required. It represents the high-strength end of the performance spectrum for this versatile case-hardening grade. -:- For detailed product information, please contact sales. -: AISI 8615 Steel, heat treated, 150°C (300°F) temper, 25 mm bar Specification Dimensions Size： Diameter 20-1000 mm Length <4145 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 8615 Steel, heat treated, 150°C (300°F) temper, 25 mm bar Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8615 Steel Flange, heat treated, 150°C (300°F) temper, 25 mm bar -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8615 Steel Flange, heat treated, 150°C (300°F) temper, 25 mm bar -:- For detailed product information, please contact sales. -:

Packing of AISI 8615 Steel Flange, heat treated, 150°C (300°F) temper, 25 mm bar -:- 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 616 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