AISI 6118 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 6118 Steel Flange Product Information -:- For detailed product information, please contact sales. -: AISI 6118 Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

AISI 6118 Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 6118 Low-Alloy Case-Hardening Steel** **Overview** AISI 6118 is a low-alloy, chromium-vanadium case-hardening steel known for its excellent **core toughness and good surface hardenability**. It is primarily designed for **carburizing (case hardening)** processes, which create a hard, wear-resistant outer layer ("case") while maintaining a ductile and impact-resistant inner core. This combination makes it ideal for high-strength, high-fatigue components subjected to heavy loads, shock, and surface wear. It is often supplied in the cold-drawn or annealed condition for optimal machinability prior to heat treatment. --- ### **1. Chemical Composition (Typical % by Weight, AISI Standard)** The balanced alloying elements in 6118 provide the necessary hardenability for both the case and core, while vanadium contributes to grain refinement and toughness. | Element | Content (%) | Role & Effect | | :--- | :--- | :--- | | **Carbon (C)** | 0.16 - 0.21 | Provides base strength. Low enough for good core toughness after carburizing, but sufficient for core hardening. | | **Manganese (Mn)** | 0.50 - 0.70 | Increases hardenability, aids in deoxidation, and improves strength. | | **Phosphorus (P)** | ≤ 0.035 | Impurity; kept low to prevent embrittlement. | | **Sulfur (S)** | 0.08 - 0.13 | **Intentionally added** to form manganese sulfides, which improve machinability (a "resulturized" grade). | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer and strengthens the ferrite matrix. | | **Chromium (Cr)** | 0.50 - 0.70 | Enhances hardenability (particularly for the case depth), promotes formation of hard carbides in the case, and improves tempering resistance. | | **Vanadium (V)** | 0.10 - 0.15 | Strong grain refiner. Inhibits grain growth during high-temperature carburizing, resulting in a finer core microstructure and improved toughness/impact strength. | | **Iron (Fe)** | Balance | | --- ### **2. Physical & Mechanical Properties** **A. Physical Properties (Annealed State)** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Elastic Modulus (Young's Modulus):** ~205 GPa (29.7 x 10⁶ psi) * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** ~51.9 W/m·K * **Coefficient of Thermal Expansion:** 11.5 x 10⁻⁶ /K (20-100°C) **B. Mechanical Properties (Typical, After Carburizing & Heat Treatment)** *Note: Properties vary significantly with exact case depth, carburizing cycle, and final tempering.* * **Surface Hardness (Case):** 58 - 63 HRC (after carburizing and quenching) * **Core Hardness:** 25 - 40 HRC (dependent on part size and quench severity) * **Core Tensile Strength:** 550 - 850 MPa (80 - 123 ksi) * **Core Yield Strength (0.2% Offset):** 400 - 700 MPa (58 - 102 ksi) * **Core Elongation:** 15% - 25% * **Impact Strength (Charpy V-notch, Core):** Good to excellent, a key advantage over higher-carbon through-hardening steels. --- ### **3. Product Applications** AISI 6118 is chosen for components that require a hard, wear-resistant surface coupled with a tough, shock-absorbing core. Common applications include: * **Automotive & Trucking:** * **Gears:** Differential gears, transmission gears, synchronizer hubs, pinions. * **Shafts:** Axle shafts, drive shafts, splined shafts. * **Critical Components:** Crankshafts, steering components, universal joint yokes. * **Heavy Machinery & Off-Highway:** * Heavy-duty gear sets for construction and mining equipment. * Sprockets, rollers, and track links. * High-strength pins and bushings. * **Aerospace & Defense:** * Gears and power transmission components in actuators and auxiliary systems. * **Industrial Equipment:** * High-load, high-cycle gears in gearboxes and reducers. * Camshafts, eccentric shafts, and clutch parts. --- ### **4. International Standards & Designations** AISI 6118 has close equivalents in several international standards systems. The **intentional sulfur content for machinability** is a key distinguishing feature. | Standard System | Designation | Notes / Key Comparison | | :--- | :--- | :--- | | **AISI / SAE (USA)** | **SAE/AISI 6118** | The standard designation. The "61" series indicates chromium-vanadium steels. | | **UNS (USA)** | **G61180** | Unified Numbering System equivalent. | | **ASTM (USA)** | **ASTM A322** (Grade 6118) | Standard specification for hot-rolled or cold-finished alloy steel bars. | | **DIN / EN (Germany/EU)** | **~1.7131 (16MnCr5)** or **1.6523 (18CrMo4)** | *Not a direct equivalent.* The sulfurized version of 6118 is a specific North American grade. For properties, 16MnCr5 or 18CrMo4 are similar but with lower/no S. | | **JIS (Japan)** | **No direct equivalent** | Similar case-hardening grades exist (e.g., SCM series), but the specific 6118 composition with S is not standardized. | | **GB (China)** | **No direct equivalent** | Similar grades like 20CrMnTi serve a comparable purpose but have different alloying. | **Important Note on Equivalents:** While 6118 belongs to the family of Cr-V case-hardening steels (like the former **AISI 6115**), its **resulturized (S-added)** version is less common internationally. Its primary use is in North American manufacturing. Engineers looking for a direct functional substitute in other regions often select a standard case-hardening grade (e.g., **SAE 8620, 4320, or 4118**) or the European grades mentioned above, based on the required core hardenability and size of the part. --- ### **Summary** AISI 6118 is a specialized, resulturized case-hardening steel that offers an excellent balance of **machinability in the annealed state** and **superior performance after carburizing**. The addition of **vanadium** for grain refinement gives it a toughness advantage over many standard case-hardening grades, making it a premium choice for demanding, high-impact applications such as heavy-duty automotive and off-highway gear components. Its specification reflects a need for durability, reliability, and manufacturing efficiency in high-stress mechanical systems. -:- For detailed product information, please contact sales. -: AISI 6118 Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4134 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 6118 Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 6118 Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 6118 Steel Flange -:- For detailed product information, please contact sales. -:

Packing of AISI 6118 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 605 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