AISI E4340 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 E4340 Steel Flange, annealed, 25 mm round Product Information -:- For detailed product information, please contact sales. -: AISI E4340 Steel Flange, annealed, 25 mm round Synonyms -:- For detailed product information, please contact sales. -:

AISI E4340 Steel, annealed, 25 mm round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI E4340 Alloy Steel Round Bar, Annealed Condition, 25 mm Diameter** **Overview** AISI E4340 is a high-strength, low-alloy steel renowned for its exceptional toughness, good fatigue strength, and high hardenability. Supplied in the **annealed condition**, the 25 mm diameter round bar offers optimal machinability and a uniform, soft microstructure, making it an ideal starting material for parts that will undergo subsequent heat treatment (quenching and tempering) to achieve their final mechanical properties. This grade is a workhorse material for demanding applications in aerospace, automotive, and heavy industry. **Key Advantages** * **Superior Hardenability:** Deep hardening characteristics allow for the development of high strength throughout thick sections. * **Excellent Strength-Toughness Balance:** After heat treatment, it achieves an outstanding combination of tensile strength and impact resistance. * **Good Machinability (in Annealed State):** The soft, annealed structure facilitates easier turning, milling, and drilling compared to its hardened state. * **Fatigue Resistance:** Well-suited for components subjected to cyclic loading. --- #### **1. Chemical Composition (Standard Conformity)** The composition adheres to standard specifications, ensuring consistent performance. | Element | Content (%) | Standard Reference | | :--- | :--- | :--- | | **Iron (Fe)** | Balance | - | | **Nickel (Ni)** | 1.65 - 2.00 | Primary alloy for toughness & hardenability | | **Chromium (Cr)** | 0.70 - 0.90 | Enhances hardenability and wear resistance | | **Molybdenum (Mo)**| 0.20 - 0.30 | Promotes strength at high temperatures & hardenability | | **Manganese (Mn)** | 0.60 - 0.80 | Aids hardenability and deoxidization | | **Carbon (C)** | 0.38 - 0.43 | Provides core strength and hardness | | **Silicon (Si)** | 0.15 - 0.30 | Deoxidizer and strengthens ferrite | | **Phosphorus (P)** | ≤ 0.035 | Impurity (controlled) | | **Sulphur (S)** | ≤ 0.040 | Impurity (controlled) | **Applicable International/Dimensional Standards:** * **ASTM A29/A29M:** Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished * **AMS 6414:** Aerospace Material Specification (common for 4340) * **SAE J434:** Automotive Standard (covers chemical and hardness ranges) * **Diameter Tolerance:** Typically per ASTM A29, Cold Finished or Hot Rolled tolerance grades. #### **2. Physical & Mechanical Properties (Annealed Condition)** *Note: Properties are for the "as-supplied" annealed condition. Final properties are achieved after quenching and tempering.* | Property | Value / Description | Condition / Note | | :--- | :--- | :--- | | **Hardness** | 197 - 241 HB | Brinell Hardness, typical for annealed state | | **Tensile Strength** | ~ 655 MPa (95 ksi) | Approximate, annealed | | **Yield Strength** | ~ 415 MPa (60 ksi) | Approximate, annealed | | **Elongation** | ~ 22% | In 50 mm, typical | | **Reduction of Area** | ~ 50% | Typical | | **Density** | 7.85 g/cm³ | | | **Modulus of Elasticity** | 190 - 205 GPa | | | **Machinability** | ~ 55% (of 1% C steel) | Good in annealed state | #### **3. Typical Applications** This 25mm round bar is processed into critical components that are later heat-treated. Common applications include: * **Aerospace:** Landing gear components, engine mounts, critical bolts, and airframe parts. * **Automotive & Racing:** High-performance crankshafts, connecting rods, axle shafts, and transmission gears. * **Oil & Gas:** Drill collars, tool joints, and high-strength fasteners for downhole equipment. * **General Engineering:** Heavy-duty gears, pinions, studs, bolts, and machine parts requiring high strength and fatigue resistance. * **Defense:** Components for armored vehicles and artillery. #### **4. Heat Treatment Note** As-supplied in the **annealed condition**, this product is designed for **subsequent heat treatment**: 1. **Austenitizing:** ~ 830°C - 850°C (1525°F - 1560°F), followed by oil quenching. 2. **Tempering:** Typically between 425°C - 650°C (800°F - 1200°F) to achieve the desired strength-toughness balance. *After proper quenching and tempering, tensile strength can exceed 1500 MPa (220 ksi).* --- **Disclaimer:** This information is for reference purposes. Specific properties may vary slightly between melts and manufacturers. Always consult the manufacturer's data sheet and conduct appropriate testing for critical applications. -:- For detailed product information, please contact sales. -: AISI E4340 Steel, annealed, 25 mm round Specification Dimensions Size： Diameter 20-1000 mm Length <4066 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 E4340 Steel, annealed, 25 mm round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI E4340 Steel Flange, annealed, 25 mm round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI E4340 Steel Flange, annealed, 25 mm round -:- For detailed product information, please contact sales. -:

Packing of AISI E4340 Steel Flange, annealed, 25 mm round -:- 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 537 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