AISI 9840 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 9840 Steel Flange, 540°C (1000°F) temper, 25 mm (1 in.) round Product Information -:- For detailed product information, please contact sales. -: AISI 9840 Steel Flange, 540°C (1000°F) temper, 25 mm (1 in.) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 9840 Steel, 540°C (1000°F) temper, 25 mm (1 in.) round Product Information -:- For detailed product information, please contact sales. -: # **Product Datasheet: AISI 9840 Alloy Steel - Quenched & Tempered Condition** ## **1. Product Overview** **AISI 9840** is a nickel-chromium-molybdenum alloy steel known for its excellent combination of high strength, good toughness, and superior hardenability. This datasheet specifies the material in a **fully heat-treated condition**: oil quenched and tempered at **540°C (1000°F)**, supplied as **25 mm (1 inch) diameter round bars**. This specific tempering temperature produces an optimal balance of strength and ductility, making it suitable for high-stress structural components. The 25 mm round form factor ensures predictable through-hardening characteristics with minimal section sensitivity. ## **2. International Standards & Designations** | System/Authority | Designation | Specification / Standard | | :--- | :--- | :--- | | **UNS** | G98400 | Unified Numbering System | | **AISI / SAE** | 9840 | Standard Alloy Steel Designation | | **ASTM** | A322 | Standard Specification for Steel Bars, Alloy, Standard Grades | | **ASTM** | A29/A29M | General Specification for Steel Bars, Alloy | | **SAE** | J404, J412 | Chemical Composition Standards | | **AMS** | 6324 (similar) | Aerospace Material Specification | | **DIN** | 36CrNiMo4 (similar) | German Standard (approximate equivalent) | | **JIS** | SNCM439 (similar) | Japanese Industrial Standard | ## **3. Chemical Composition (% by Weight)** The nickel-chromium-molybdenum system provides deep hardenability and good core properties in medium-to-large sections. | Element | AISI 9840 Specification Range | Typical % | | :--- | :--- | :--- | | **Carbon (C)** | 0.38 - 0.43 | 0.40 | | **Manganese (Mn)** | 0.70 - 0.90 | 0.80 | | **Phosphorus (P)** | ≤ 0.035 | 0.020 | | **Sulfur (S)** | ≤ 0.040 | 0.025 | | **Silicon (Si)** | 0.20 - 0.35 | 0.25 | | **Nickel (Ni)** | 0.85 - 1.15 | 1.00 | | **Chromium (Cr)** | 0.70 - 0.90 | 0.80 | | **Molybdenum (Mo)** | 0.20 - 0.30 | 0.25 | | **Iron (Fe)** | Balance | Balance | ## **4. Mechanical & Physical Properties (Q&T @ 540°C / 1000°F)** Properties listed are typical for **25 mm (1 inch) diameter round bars**, oil quenched and tempered at 540°C. Larger diameters will exhibit lower core hardness and strength. | Property | Typical Value / Range | Test Standard | Notes | | :--- | :--- | :--- | :--- | | **Condition** | Oil Quenched & Tempered @ 540°C | -- | Ready for use | | **Surface Hardness** | 40 - 44 HRC | ASTM E18 | Measured on bar surface | | **Core Hardness** | 38 - 42 HRC | ASTM E18 | At center of 25mm round | | **Tensile Strength** | 1240 - 1380 MPa (180 - 200 ksi) | ASTM A370 | | | **Yield Strength (0.2%)** | 1100 - 1240 MPa (160 - 180 ksi) | ASTM A370 | | | **Elongation (in 50mm)** | 12% - 16% | ASTM A370 | | | **Reduction of Area** | 40% - 50% | ASTM A370 | | | **Impact Toughness** | 40 - 55 J (30 - 40 ft·lb) | ASTM E23 | Charpy V-notch, room temp | | **Modulus of Elasticity** | 205 GPa (29.7 × 10⁶ psi) | -- | | | **Fatigue Strength** | ~550 - 620 MPa (80 - 90 ksi) | -- | Rotating beam, polished | | **Density** | 7.85 g/cm³ (0.284 lb/in³) | -- | | ## **5. Key Characteristics & Advantages** * **Excellent Strength-Toughness Balance:** The 540°C temper provides an optimal combination for many structural applications. * **Good Through-Hardenability:** Nickel-chromium-molybdenum alloying ensures minimal property gradient in 25mm sections. * **Good Fatigue Resistance:** Suitable for dynamically loaded components. * **Moderate Wear Resistance:** Can be used for sliding/wearing applications with proper lubrication. * **Predictable Machinability (in annealed state):** Typically machined before final heat treatment. ## **6. Primary Applications** This material in the Q&T 540°C condition is ideal for: * **High-Stress Fasteners:** Large bolts, studs, and connecting rods requiring high tensile strength. * **Power Transmission Components:** Gears, shafts, and pinions in automotive and industrial gearboxes. * **Oil & Gas Equipment:** Valve parts, mandrels, and downhole tool components. * **Aerospace Components:** Landing gear parts, actuator components (subject to specific aerospace specifications). * **Heavy Machinery:** Axles, pivot pins, and high-load structural components. * **Tooling Applications:** Jigs, fixtures, and die components requiring high strength with moderate toughness. ## **7. Processing & Fabrication Notes** **Important:** This product is supplied in final heat-treated condition. No further heat treatment is recommended. * **Machining & Grinding:** * Use carbide or ceramic tooling with adequate cooling. * Grinding should use light passes with ample coolant to prevent local overheating. * Stress relieving may be required after heavy machining. * **Welding:** * **Not recommended** in this hardened condition. * If absolutely necessary, use pre-heat (200-300°C) and post-weld tempering. * Consider using annealed material for fabrication, then heat treat. * **Surface Treatments:** * Suitable for plating, phosphating, or nitriding. * Nitriding can significantly improve surface hardness without affecting core properties. ## **8. Heat Treatment History & Assumptions** * **Assumed Austenitizing:** 830-850°C (1525-1560°F) in controlled atmosphere * **Quenching Medium:** Oil * **Tempering:** 540°C (1000°F) for 1-2 hours per inch of thickness * **Microstructure:** Tempered martensite with fine carbide dispersion ## **9. Quality Assurance** Material should be supplied with certification including: * Chemical analysis * Mechanical test results (tensile, hardness) * Heat treatment records * Traceability to original melt --- **Note:** Properties are typical for the specified condition and size. Actual properties may vary based on manufacturer's processing parameters. For critical applications, verification testing on actual material is recommended. -:- For detailed product information, please contact sales. -: AISI 9840 Steel, 540°C (1000°F) temper, 25 mm (1 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <6399 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 9840 Steel, 540°C (1000°F) temper, 25 mm (1 in.) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 9840 Steel Flange, 540°C (1000°F) temper, 25 mm (1 in.) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 9840 Steel Flange, 540°C (1000°F) temper, 25 mm (1 in.) round -:- For detailed product information, please contact sales. -:

Packing of AISI 9840 Steel Flange, 540°C (1000°F) temper, 25 mm (1 in.) 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 2870 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