ASTM A543 Low Alloy Steel Flange, Grade B, Class 3

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. -: ASTM A543 Low Alloy Steel Flange, Grade B, Class 3 Product Information -:- For detailed product information, please contact sales. -: ASTM A543 Low Alloy Steel Flange, Grade B, Class 3 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A543 Low Alloy Steel, Grade B, Class 3 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A543 Grade B Class 3: Ultra-High Strength Nickel-Chromium-Molybdenum Alloy Steel Plate** #### **1. Overview** ASTM A543 Grade B Class 3 is an **ultra-high strength nickel-chromium-molybdenum alloy steel plate** supplied in the **quenched and tempered condition**. Representing the highest strength level within the Grade B classification, this premium material is engineered for the most demanding pressure vessel applications where maximum strength must be combined with exceptional low-temperature toughness. Class 3 delivers superior mechanical performance for critical cryogenic and high-pressure services. #### **2. Chemical Composition** The chemical composition features enhanced controls for ultra-high strength applications: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.20 max | | Manganese (Mn) | 0.20 - 0.60 | | Phosphorus (P) | 0.020 max | | Sulfur (S) | 0.015 max | | Silicon (Si) | 0.15 - 0.40 | | Nickel (Ni) | 2.00 - 3.50 | | Chromium (Cr) | 1.00 - 1.90 | | Molybdenum (Mo) | 0.40 - 0.60 | **Premium Composition Features:** - **Enhanced Nickel Content (2.00-3.50%)**: Maintains exceptional toughness at ultra-high strength levels - **Optimized Chromium-Molybdenum Balance**: Provides maximum hardenability and strength retention - **Tighter Impurity Control**: Maximum 0.020% P and 0.015% S for improved fracture resistance - **Advanced Alloy Design**: Ensures consistent performance in the most demanding applications #### **3. Physical & Mechanical Properties** **Mechanical Properties (Quenched & Tempered Condition):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 125 - 155 ksi (860 - 1070 MPa) | | **Yield Strength** | 105 ksi min (725 MPa min) | | **Elongation in 2 inches** | 14% min | | **Reduction of Area** | 35% min | | **Charpy V-Notch Impact** | 40 ft-lb min at -100°F (-73°C) | **Ultra-High Performance Characteristics:** - **Maximum Strength Capability**: Highest mechanical properties within Grade B classification - **Exceptional Low-Temperature Toughness**: Maintains premium impact values at cryogenic temperatures - **Superior Hardenability**: Excellent through-thickness properties in heavy sections - **Enhanced Fatigue Resistance**: Superior performance under cyclic loading conditions **Physical Properties (Typical):** - **Density**: 0.285 lb/in³ (7,890 kg/m³) - **Modulus of Elasticity**: 29,000 ksi (200 GPa) - **Thermal Expansion Coefficient**: 6.2 × 10⁻⁶/°F (11.2 × 10⁻⁶/°C) - **Thermal Conductivity**: 25.5 W/m·K at 212°F (100°C) - **Poisson's Ratio**: 0.29 #### **4. Product Applications** Grade B Class 3 is reserved for the most critical applications requiring maximum strength and toughness: **Advanced Cryogenic Systems:** - Ultra-high pressure LNG storage vessels - Cryogenic process equipment - Advanced low-temperature containment systems - Specialized cryogenic research facilities **Nuclear and Power Generation:** - Nuclear reactor pressure vessels - Advanced power plant components - High-pressure energy systems - Critical power generation equipment **Aerospace and Defense:** - Rocket motor cases - High-pressure aerospace components - Defense pressure systems - Advanced propulsion systems #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-2** | 12Ni14 | Ultra-high strength variant | | **Europe** | **EN 10028-4** | 12Ni14 | Premium quality equivalent | | **Japan** | **JIS G3127** | SL3N255 | Special high-strength grade | | **Germany** | **DIN 17280** | 12Ni14 | High-performance nickel steel | **Complete Grade B Performance Spectrum:** | Parameter | Class 1 | Class 2 | Class 3 | |-----------|---------|---------|---------| | **Yield Strength Minimum** | 85 ksi | 95 ksi | 105 ksi | | **Tensile Strength Range** | 105-135 ksi | 115-145 ksi | 125-155 ksi | | **Impact Energy** | 40 ft-lb | 40 ft-lb | 40 ft-lb | | **Typical Hardness** | 240-300 HBW | 260-320 HBW | 280-340 HBW | #### **6. Fabrication & Quality Excellence** **Advanced Welding Technology:** - **Critical pre-heat protocol**: 350-450°F (177-232°C) minimum - **Precision interpass control**: 450-550°F (232-288°C) maximum - **Optimized PWHT**: 1150-1250°F (621-677°C) with advanced monitoring - **Premium welding consumables**: Specially formulated for ultra-high strength applications - **Advanced NDE requirements**: 100% volumetric examination mandatory **State-of-the-Art Heat Treatment:** - **Precision austenitizing**: 1550-1650°F (845-900°C) with strict uniformity control - **Enhanced quenching technology**: Optimized cooling rate management - **Multiple-stage tempering**: 1200-1400°F (649-760°C) for property optimization - **Real-time process monitoring**: Comprehensive digital verification systems **Uncompromising Quality Assurance:** - **Advanced ultrasonic examination**: Phased array or TOFD methods per ASTM A578 Level III - **Comprehensive mechanical testing**: Including advanced fracture mechanics characterization - **Metallurgical verification**: Sophisticated microstructural analysis - **Complete digital traceability**: Advanced documentation systems --- **Breakthrough Technical Advantages:** - **Ultimate strength capability** within nickel-chromium-molybdenum steel family - **Exceptional low-temperature performance** maintained at maximum strength levels - **Superior resistance to brittle fracture** - **Premium quality consistency** for critical applications **Engineering Excellence Requirements:** - **Advanced ASME Section VIII Division 2** design methodology - **Comprehensive fracture mechanics analysis** using latest methodologies - **Sophisticated fatigue assessment** for cyclic service conditions - **State-of-the-art non-destructive evaluation** **Service Performance Guidelines:** - **Minimum design temperature**: -100°F (-73°C) - **Maximum service temperature**: 700°F (371°C) - **Welding integrity**: Critical procedure control and verification - **Quality assurance**: Enhanced testing and documentation requirements **Disclaimer:** This information represents the highest standard of technical reference for ASTM A543 Grade B Class 3. For ultra-critical pressure vessel applications involving cryogenic service and high-pressure conditions, absolute adherence to the latest ASTM specifications and applicable ASME Code requirements is mandatory. All design, material selection, fabrication, and testing activities must be directed by exceptionally qualified engineers and subject to the most rigorous quality assurance protocols and regulatory oversight. -:- For detailed product information, please contact sales. -: ASTM A543 Low Alloy Steel, Grade B, Class 3 Specification Dimensions Size： Diameter 20-1000 mm Length <4455 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. -: ASTM A543 Low Alloy Steel, Grade B, Class 3 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A543 Low Alloy Steel Flange, Grade B, Class 3 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A543 Low Alloy Steel Flange, Grade B, Class 3 -:- For detailed product information, please contact sales. -:

Packing of ASTM A543 Low Alloy Steel Flange, Grade B, Class 3 -:- 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 926 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