AISI 4118 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 4118 Steel Flange, Product Information -:- For detailed product information, please contact sales. -: AISI 4118 Steel Flange, Synonyms -:- For detailed product information, please contact sales. -:

AISI 4118 Steel, Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 4118 Steel** **Overview** AISI 4118 is a versatile, low-carbon case-hardening chromium-molybdenum (Cr-Mo) alloy steel. It is designed to combine a tough, ductile core with an extremely hard, wear-resistant surface layer after carburizing or carbonitriding heat treatment. This “hard shell, soft core” characteristic makes it an ideal choice for components subjected to high surface contact stress, rolling, sliding wear, and fatigue, while requiring good impact resistance and core strength. It offers a favorable balance of performance, processability, and cost-effectiveness. **Key International Standards & Designations** * **AISI / SAE:** 4118 * **UNS:** G41180 * **Germany (DIN):** 1.7139 / 16MnCr5 (slightly different composition, but similar application) * **Europe (EN):** 1.7139 / 16MnCr5 * **Japan (JIS):** SCr415 / SCr420 (closest equivalents) * **Note:** While AISI 4118 is a standardized grade, its closest functional equivalents in different standards may have minor compositional variations. For precise sourcing, UNS G41180 is the universal identifier. **Chemical Composition (Typical, Weight %)** The low carbon content is key for core toughness after case hardening. | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Carbon (C)** | 0.17 - 0.22 | **Molybdenum (Mo)** | 0.08 - 0.15 | | **Manganese (Mn)** | 0.70 - 0.90 | **Phosphorus (P)** | ≤ 0.035 | | **Silicon (Si)** | 0.15 - 0.35 | **Sulfur (S)** | ≤ 0.040 | | **Chromium (Cr)** | 0.40 - 0.60 | **Iron (Fe)** | Balance | *Composition is per AISI/SAE specification. Controlled sulfur (re-sulfurized) versions may exist for improved machinability.* **Physical & Mechanical Properties (Core - in Normalized Condition)** *Properties before case hardening.* * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Melting Point:** Approx. 1420 - 1520 °C (2590 - 2770 °F) * **Modulus of Elasticity:** 205 GPa (29.7 x 10⁶ psi) * **Thermal Conductivity:** ~42.6 W/m·K (at 100°C) * **Typical Mechanical Properties (Normalized or Annealed):** * **Tensile Strength:** 500 - 700 MPa (73 - 102 ksi) * **Yield Strength (0.2% Offset):** 320 MPa min (46 ksi min) * **Elongation:** 20% min * **Hardness:** 150 - 200 HB * **Hardenability:** Good. The chromium and molybdenum provide sufficient core hardenability for medium-sized parts. **Properties After Case Hardening** * **Surface Hardness:** 58 - 63 HRC (after carburizing/quenching) * **Effective Case Depth:** Variable, typically 0.5 mm to 1.5 mm (0.020" to 0.060") based on process time/temperature. * **Core Hardness:** 25 - 40 HRC (after quenching from carburizing temperature, providing strong support for the hard case). **Product Forms & Applications** AISI 4118 is commonly supplied in the hot-rolled, cold-drawn, or annealed condition for optimal machinability prior to heat treatment. * **Available Forms:** * Round, Hex, and Square Bars * Wire Rods and Coils * Forging Billets * Tubing * **Primary Applications:** (Focused on case-hardened components) * **Automotive & Transportation:** **Gears** (transmission, differential, timing), **sprockets**, **camshafts**, **axle shafts**, **pins**, **bushings**, and clutch components. * **Power Transmission:** Light to medium-duty **gear sets**, **splined shafts**, and drive components in machinery. * **General Machinery:** **Cams**, **rollers**, **liners**, and various **wear-resistant parts** requiring a tough core. * **Fasteners:** High-strength bolts, studs, and special fasteners that benefit from a hardened surface. **Heat Treatment** The primary process for AISI 4118 is **Case Hardening**: 1. **Carburizing or Carbonitriding:** The part is heated (typically 900-950°C / 1650-1740°F) in a carbon-rich atmosphere, allowing carbon to diffuse into the surface, creating a high-carbon steel layer. 2. **Quenching:** Rapidly cooled (usually in oil) from the carburizing temperature or a slightly lower temperature. This transforms the high-carbon surface into hard martensite, while the low-carbon core forms a tougher, lower-hardness martensite/bainite structure. 3. **Tempering:** Typically performed at 150-200°C (300-400°F) to relieve quenching stresses without significantly reducing surface hardness. For carbonitriding, the process is similar but uses an atmosphere containing both carbon and nitrogen, often at a slightly lower temperature, resulting in a harder, more distortion-resistant case. **Why Choose AISI 4118?** * **Excellent Case Hardening Response:** Reliably produces a deep, hard, and wear-resistant surface. * **Strong & Tough Core:** Provides excellent resistance to bending and impact, preventing the hard case from cracking under load. * **Good Machinability (in annealed condition):** Allows for economical production of complex part geometries. * **Good Balance of Performance and Cost:** A widely available and cost-effective choice for a vast range of medium-duty hardened components. * **Good Hardenability:** Suitable for parts with moderate cross-sectional sizes. For detailed information on specific processing guidelines, machinability data, or case depth charts, please consult our technical data sheets or contact our engineering team. -:- For detailed product information, please contact sales. -: AISI 4118 Steel, Specification Dimensions Size： Diameter 20-1000 mm Length <4031 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 4118 Steel, Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4118 Steel Flange, -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4118 Steel Flange, -:- For detailed product information, please contact sales. -:

Packing of AISI 4118 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 502 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