ASTM A533 Low Alloy Steel Flange, Grade A, 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 A533 Low Alloy Steel Flange, Grade A, Class 3 Product Information -:- For detailed product information, please contact sales. -: ASTM A533 Low Alloy Steel Flange, Grade A, Class 3 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A533 Low Alloy Steel, Grade A, Class 3 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A533 Grade A Class 3: High-Strength Quenched and Tempered Alloy Steel Plate** #### **1. Overview** ASTM A533 Grade A Class 3 represents the **highest strength level** within the Grade A classification of ASTM A533 specification for pressure vessel plates. This class provides **maximum strength** while maintaining adequate toughness for critical applications, particularly in **heavy-wall pressure vessels** where weight reduction and high pressure containment are essential design considerations. The material is supplied in quenched and tempered condition to achieve its superior mechanical properties. #### **2. Chemical Composition** The chemical composition matches other Grade A classes but is processed to achieve higher strength: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.25 max | | Manganese (Mn) | 0.95 - 1.30 | | Phosphorus (P) | 0.035 max | | Sulfur (S) | 0.035 max | | Silicon (Si) | 0.15 - 0.40 | | Nickel (Ni) | 0.70 - 1.00 | | Molybdenum (Mo) | 0.45 - 0.60 | **Heat Treatment Requirements:** - **Quenching:** Rapid cooling from austenitizing temperature - **Tempering:** Typically at lower temperatures than Class 1 and 2 - **Grain Size:** Fine austenitic grain size 5 or finer required #### **3. Physical & Mechanical Properties** **Mechanical Properties (Up to 2½ inches / 63 mm thickness):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 100 - 115 ksi (690 - 795 MPa) | | **Yield Strength** | 85 ksi min (585 MPa min) | | **Elongation in 2 inches** | 14% min | | **Reduction of Area** | 35% min | | **Charpy V-Notch Impact** | 35 ft-lb min at -75°F (-60°C) | **Thickness Limitations and Property Adjustment:** - Maximum thickness: 12 inches (305 mm) - Properties decrease with increasing thickness - For thickness 2½-4 inches: Yield strength min 80 ksi (550 MPa) - For thickness 4-6 inches: Yield strength min 75 ksi (515 MPa) **Physical Properties (Typical):** - **Density:** 0.284 lb/in³ (7,850 kg/m³) - **Modulus of Elasticity:** 29,000 ksi (200 GPa) - **Poisson's Ratio:** 0.29 - **Thermal Expansion:** 6.3 × 10⁻⁶/°F (11.3 × 10⁻⁶/°C) at 68-212°F #### **4. Product Applications** ASTM A533 Grade A Class 3 is specified for the most demanding applications where maximum strength is required: **Nuclear Power Industry:** - Reactor pressure vessel shells - Closure heads and flanges - Steam generator components - Pressurizer shells **Petrochemical Industry:** - Heavy-wall hydrocracking reactors - High-pressure synthesis converters - Large-diameter high-pressure vessels - Critical heat exchangers **Special Applications:** - High-pressure gas storage systems - Research reactor components - Special military applications - Advanced energy systems #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-2** | 13MnNiMo5-6 | Higher strength equivalent | | **Europe** | **EN 10028-2** | 13MnNiMo5-6 | Similar strength level | | **Japan** | **JIS G3120** | SOV 3A | Comparable nuclear grade | | **Germany** | **AD 2000** | 13MnNiMo54 | Pressure vessel standard | **Mechanical Property Comparison by Class:** | Property | Class 1 | Class 2 | Class 3 | |----------|---------|---------|---------| | **Yield Strength Min** | 50 ksi | 70 ksi | 85 ksi | | **Tensile Range** | 80-100 ksi | 90-110 ksi | 100-115 ksi | | **Elongation Min** | 18% | 16% | 14% | #### **6. Fabrication & Welding Considerations** **Welding Requirements:** - **Pre-heating:** 300-400°F (150-200°C) minimum - **Interpass temperature:** 400-600°F (200-315°C) - **Post-weld heat treatment:** 1100-1150°F (595-620°C) - **Electrode type:** Low-hydrogen, high-toughness grades **Special Fabrication Considerations:** - **Forming:** May require hot forming due to high strength - **Machining:** Requires appropriate tooling and techniques - **Heat treatment control:** Critical for maintaining properties - **Repair welding:** Strict procedure control required **Quality Assurance Requirements:** - **Ultrasonic examination:** Mandatory for critical applications - **Impact test frequency:** Increased for thick sections - **Tensile testing:** Multiple orientations for anisotropic assessment - **Hardness survey:** Often required in HAZ regions --- **Key Design Considerations:** - **Strength-toughness balance** at design temperature - **Fracture mechanics analysis** for critical applications - **Environmental effects** on material performance - **Fatigue and creep behavior** for cyclic service **Nuclear Application Notes:** - **Radiation embrittlement** monitoring required - **Surveillance programs** for life extension - **Fabrication per ASME Section III** - **Enhanced NDE requirements** **Disclaimer:** This information is for reference purposes. For nuclear and other critical applications, consult the latest ASTM A533 standard and applicable construction codes. Material selection and fabrication procedures must be approved by qualified engineers and regulatory bodies. -:- For detailed product information, please contact sales. -: ASTM A533 Low Alloy Steel, Grade A, Class 3 Specification Dimensions Size： Diameter 20-1000 mm Length <4425 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 A533 Low Alloy Steel, Grade A, Class 3 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A533 Low Alloy Steel Flange, Grade A, Class 3 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A533 Low Alloy Steel Flange, Grade A, Class 3 -:- For detailed product information, please contact sales. -:

Packing of ASTM A533 Low Alloy Steel Flange, Grade A, 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 896 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