ASTM A302 Alloy Steel Flange, Grade D

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 A302 Alloy Steel Flange, Grade D Product Information -:- For detailed product information, please contact sales. -: ASTM A302 Alloy Steel Flange, Grade D Synonyms -:- For detailed product information, please contact sales. -:

ASTM A302 Alloy Steel, Grade D Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A302 Alloy Steel, Grade D** **ASTM A302 Grade D** is a premium manganese-molybdenum-nickel alloy steel plate designed for the most demanding pressure vessel applications requiring superior strength and enhanced toughness. This grade represents the highest strength level in the A302 specification, offering exceptional mechanical properties for critical pressure-containing components in severe service conditions. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A302/A302M** - "Standard Specification for Pressure Vessel Plates, Alloy Steel, Manganese-Molybdenum and Manganese-Molybdenum-Nickel" **Grade Classification:** - **Grade D** - Premium manganese-molybdenum-nickel alloy steel - Other grades: A, B, C with varying strength levels **International Equivalents:** - **EN 10028-2**: 13MnNi6-3 - **JIS G3119**: SPV 450 - **GB/T 713**: 18MnMoNbR - **ISO 9328-2**: 13MnNi6-3 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A302 Grade D: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.23 | | Manganese (Mn) | 1.20-1.60 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.040 | | Silicon (Si) | 0.15-0.40 | | Molybdenum (Mo) | 0.45-0.60 | | Nickel (Ni) | 0.40-0.70 | **Key Composition Features:** - **Enhanced Manganese**: 1.20-1.60% for superior solid solution strengthening - **Optimized Nickel**: 0.40-0.70% for improved toughness - **Molybdenum Content**: 0.45-0.60% for elevated temperature strength - **Carbon Control**: Maximum 0.23% balanced for strength and weldability --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thicknesses ≤ 50 mm):** | Property | Value | |---|---| | **Tensile Strength** | 620-795 MPa (90-115 ksi) | | **Yield Strength (min.)** | 415 MPa (60 ksi) | | **Elongation in 2" (min.)** | 16% | | **Elongation in 8" (min.)** | 18% | **Enhanced Toughness Properties:** - **Charpy V-Notch Test Temperature**: -50°F (-45°C) - **Minimum Impact Energy**: 25 ft-lbf (34 J) - **Superior Toughness**: Enhanced fracture resistance **Physical Properties:** - **Density**: 7.86 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Thermal Conductivity**: 48.0 W/m·K - **Coefficient of Thermal Expansion**: 11.7 × 10⁻⁶/°C - **Specific Heat Capacity**: 465 J/kg·K --- #### **4. Product Applications** **Critical Pressure Vessel Applications:** - High-pressure thick-walled vessels - Nuclear component supports - Critical process reactors - High-capacity storage tanks **Power Generation:** - Nuclear power plant components - High-pressure steam drums - Critical heat exchangers - Advanced power system vessels **Petrochemical Industry:** - High-pressure reactors - Critical refinery vessels - Severe service process equipment - High-temperature pressure components **Defense and Aerospace:** - Specialized pressure systems - Military equipment components - Aerospace pressure vessels - Research facility equipment --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Controlled Weldability**: Requires stringent procedure qualification - **Preheat Requirements**: 300-400°F (150-200°C) mandatory - **Post-Weld Heat Treatment**: Essential at 1100-1200°F (595-650°C) - **Recommended Processes**: GTAW, GMAW, FCAW (low-hydrogen) - **Filler Metals**: E10018-G, ER100S-G or equivalent **Forming & Machining:** - **Limited Formability**: Hot forming required for complex shapes - **Machinability**: Poor (approximately 45% of B1112 steel) - **Cutting Methods**: Waterjet and laser cutting preferred - **Tooling Requirements**: Premium carbide tooling essential **Heat Treatment:** - Supplied in normalized and tempered condition - Normalizing temperature: 1600-1700°F (870-925°C) - Tempering temperature: 1150-1250°F (620-675°C) - Strict thermal cycle control **Quality Assurance:** - **Enhanced Testing Protocol**: Multiple test locations required - **Comprehensive Impact Testing**: Stringent toughness requirements - **Advanced NDT**: Ultrasonic and radiographic examination - **Full Traceability**: Complete documentation and certification --- ### **Technical Summary** ASTM A302 Grade D represents the premium grade in the manganese-molybdenum-nickel alloy steel series, offering the highest strength level (60 ksi minimum yield strength) combined with enhanced toughness properties. This grade is specifically engineered for the most demanding pressure vessel applications where both superior strength and reliable fracture resistance are critical design requirements. The optimized chemistry, featuring enhanced manganese content and balanced nickel addition, provides exceptional mechanical properties while maintaining adequate toughness at temperatures down to -50°F (-45°C). The 20% strength advantage over Grade A and 10% advantage over Grade B make this material particularly valuable for weight-sensitive designs and high-pressure applications. While requiring the most stringent fabrication controls and comprehensive quality assurance measures, Grade D delivers unmatched performance in critical pressure vessel service. The material's proven reliability in nuclear, power generation, and petrochemical applications has established it as the material of choice for engineers designing pressure-containing components where maximum safety margins and performance reliability are paramount considerations. ASTM A302 Grade D bridges the gap between conventional alloy steels and more advanced materials, providing an optimal solution for applications demanding premium mechanical properties while maintaining reasonable fabrication characteristics within the capabilities of qualified pressure vessel manufacturers. -:- For detailed product information, please contact sales. -: ASTM A302 Alloy Steel, Grade D Specification Dimensions Size： Diameter 20-1000 mm Length <4356 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 A302 Alloy Steel, Grade D Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A302 Alloy Steel Flange, Grade D -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A302 Alloy Steel Flange, Grade D -:- For detailed product information, please contact sales. -:

Packing of ASTM A302 Alloy Steel Flange, Grade D -:- 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 827 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