AISI 8655 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 8655 Steel Flange Product Information -:- For detailed product information, please contact sales. -: AISI 8655 Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

AISI 8655 Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: AISI 8655 Alloy Steel** --- #### **1. Material Overview** **AISI 8655** is a **medium-carbon, nickel-chromium-molybdenum (Ni-Cr-Mo) alloy steel** belonging to the **"86xx" series** in the SAE/AISI system. The designation indicates a nominal composition of **0.55% carbon**, **0.50% nickel**, **0.50% chromium**, and **0.20% molybdenum**. This specific combination of alloying elements makes it a **versatile, deep-hardening steel** offering an outstanding balance of **high strength, excellent toughness, good fatigue resistance, and moderate wear resistance** after proper heat treatment. It is particularly valued for its ability to maintain good core properties in moderately large sections, making it a preferred choice for critical, high-stress components subjected to shock and impact loading. #### **2. Key Material Concept** The performance of AISI 8655 is derived from the synergistic effect of its multi-alloy system: - **Carbon (C ~0.55%)**: Provides the fundamental capacity for high hardness and tensile strength. - **Nickel (Ni ~0.50%)**: Primarily enhances **toughness and impact strength**, especially at low temperatures. It also contributes to hardenability and strengthens the ferrite matrix. - **Chromium (Cr ~0.50%)**: Increases hardenability, improves wear and corrosion resistance, and enhances response to tempering. - **Molybdenum (Mo ~0.20%)**: A potent hardenability enhancer that also **increases high-temperature strength, promotes fine grain structure, and most importantly, reduces susceptibility to temper embrittlement**. This allows the steel to be tempered in the critical 370-570°C (700-1060°F) range without significant loss of toughness. This combination results in a steel with **superior through-hardening characteristics and a much better strength-toughness balance** than simpler alloy or carbon steels like 5155 or 1060. #### **3. International Standard & Cross-References** - **Primary Standard:** **SAE J404** (Chemical Compositions of SAE Alloy Steels) / **AISI 8655** - **UNS Designation:** **G86550** - **ASTM Standards:** Commonly supplied under **ASTM A322** (Standard Specification for Steel Bars, Alloy, Standard Grades) or the general requirements of **ASTM A29/A29M**. - **AMS (Aerospace Material Specification):** Not a common aerospace grade, but used in demanding industrial applications. - **European Approximate Equivalent:** **1.6546 (34CrNiMo6)** is a close match, though it typically has higher Ni (~1.50%) and Cr (~1.50%). A closer European analogue might be a steel specified to a similar performance profile rather than exact chemistry. - **Japanese Approximate Equivalent:** **SNC236** (JIS G4102) or **SNCM439** (JIS G4103) are similar Ni-Cr-Mo steels, though compositions vary. - **"H" Grade Variant:** **8655H** is available, conforming to **ASTM A304** for controlled hardenability. #### **4. Chemical Composition (% by Weight, per SAE J404)** | Element | Content Range (%) | Key Role | | :--- | :--- | :--- | | **Carbon (C)** | **0.51 – 0.59** | Primary hardening element; determines attainable strength and hardness. | | **Manganese (Mn)** | **0.75 – 1.00** | Enhances hardenability and strength. | | **Phosphorus (P)** | **≤ 0.035** | Impurity; kept low. | | **Sulfur (S)** | **≤ 0.040** | Impurity; kept low. | | **Silicon (Si)** | **0.15 – 0.30** | Deoxidizer; strengthens ferrite. | | **Nickel (Ni)** | **0.40 – 0.70** | **Key for toughness** and impact resistance; improves hardenability. | | **Chromium (Cr)** | **0.40 – 0.60** | Increases hardenability, wear resistance, and tempering resistance. | | **Molybdenum (Mo)** | **0.15 – 0.25** | **Critical:** Enhances hardenability, refines grain, increases high-temperature strength, and **resists temper embrittlement**. | | **Iron (Fe)** | **Balance** | Base metal. | #### **5. Typical Physical & Mechanical Properties** *Properties are highly dependent on heat treatment. Values below are typical ranges.* **A. Physical Properties:** - **Density:** 7.85 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity (E):** 205 GPa (29.7 x 10⁶ psi) - **Poisson’s Ratio:** 0.29 - **Thermal Conductivity:** ~42 W/m·K (at 20°C) **B. Mechanical Properties by Condition:** * **Annealed Condition (for machining):** * **Hardness:** 187 – 229 HBW * **Tensile Strength:** ~650 MPa (94 ksi) * **Heat-Treated Condition (Quenched & Tempered - Example):** * **Tensile Strength:** 1000 – 1300 MPa (145 – 189 ksi) * **Yield Strength (0.2% Offset):** 850 – 1150 MPa (123 – 167 ksi) * **Elongation:** 12% – 18% * **Reduction in Area:** 45% – 60% * **Hardness:** 30 – 45 HRC (Widely adjustable via tempering) * **Impact Toughness (Charpy V-notch):** **40 – 80 J (30 – 59 ft-lb)** at room temperature – notably high for its strength level. #### **6. Processing & Fabrication Characteristics** - **Hardenability:** **Very High (High H-Band).** The combination of Ni, Cr, and Mo provides excellent depth of hardening, suitable for through-hardening of sections up to **~75-100 mm (3-4 inches)** with an effective oil quench. - **Machinability (Annealed State):** **Fair.** The alloy content makes it tougher to machine than carbon steels. Requires appropriate tooling and speeds/feeds. - **Weldability:** **Poor.** The medium carbon content and alloying elements give it a high carbon equivalent. Welding requires **strict procedures**: high preheat (200-315°C / 400-600°F), low-hydrogen electrodes, and **mandatory Post-Weld Heat Treatment (PWHT)**. - **Forging Temperature:** 1150 – 900°C (2100 – 1650°F). Do not forge below 900°C. - **Heat Treatment:** * **Annealing:** Heat to ~830-850°C (1525-1560°F), slow cool. * **Hardening (Quenching):** Austenitize at 830-850°C (1525-1560°F), quench in oil. * **Tempering:** Temper between **425-650°C (800-1200°F)**. The molybdenum content allows tempering in the traditional "embrittlement range" with less risk, enabling a good combination of strength and toughness. #### **7. Primary Applications** AISI 8655 is selected for demanding, high-integrity components where a combination of strength, toughness, and fatigue life is critical: - **Heavy-Duty Gears & Pinions:** Large gears, pinions, and shafts in industrial gearboxes, mining equipment, and heavy vehicles. - **High-Strength Axles & Shafts:** Critical axle shafts, drive shafts (especially for heavy trucks and off-road equipment), and crankshafts. - **Oil & Gas Drilling Components:** Drill collar subs, tool joints, and other high-strength downhole tools. - **Forged Industrial Components:** Connecting rods, piston rods, crankshafts, and other high-stress forgings. - **Defense Applications:** Track links, suspension components, and other armored vehicle parts. - **Large Fasteners:** High-strength bolts and studs for critical structural connections. #### **8. Available Forms** - **Most Common:** Hot-rolled or forged rounds, squares, and billets. Often supplied in the annealed or normalized & tempered condition for machining. - **Other Forms:** Flats and occasionally plates from specialty mills. **Disclaimer:** This datasheet provides characteristic information for material selection. **AISI 8655 is a high-performance engineering steel.** Actual properties are determined by the final manufacturing process, section size, and specific heat treatment. For engineering design, always consult certified material test reports (CMTRs) and consider the specific application requirements. For applications requiring consistent through-hardening, specify the **8655H** grade to **ASTM A304**. Collaboration with a metallurgist is recommended for critical components. -:- For detailed product information, please contact sales. -: AISI 8655 Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5183 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 8655 Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8655 Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8655 Steel Flange -:- For detailed product information, please contact sales. -:

Packing of AISI 8655 Steel Flange -:- 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 1654 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