ASTM A533 Low Alloy Steel Flange, Grade A, Class 2

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 2 Product Information -:- For detailed product information, please contact sales. -: ASTM A533 Low Alloy Steel Flange, Grade A, Class 2 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A533 Low Alloy Steel, Grade A, Class 2 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A533 Grade A Class 2: High-Strength Quenched and Tempered Alloy Steel Plate** #### **1. Overview** ASTM A533 Grade A Class 2 is a high-strength, quenched and tempered alloy steel plate within the ASTM A533 specification, specifically designed for **heavy-section pressure vessel applications** requiring superior toughness. This class offers **enhanced strength** compared to Class 1 while maintaining excellent toughness properties, making it suitable for critical applications where both high strength and fracture resistance are paramount. #### **2. Chemical Composition** The chemical composition is identical to Grade A Class 1, carefully balanced for optimal hardenability in thick sections: | 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 | **Microstructural Characteristics:** - **Fine-grained practice** required - **Austenitic grain size:** 5 or finer - **Heat treatment:** Quenched and tempered condition #### **3. Physical & Mechanical Properties** **Mechanical Properties (Up to 2½ inches / 63 mm thickness):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 90 - 110 ksi (620 - 760 MPa) | | **Yield Strength** | 70 ksi min (485 MPa min) | | **Elongation in 2 inches** | 16% min | | **Reduction of Area** | 40% min | | **Charpy V-Notch Impact** | 40 ft-lb min at -75°F (-60°C) | **Thickness Limitations:** - Maximum thickness: 12 inches (305 mm) - Mechanical properties vary with section size - Thicker sections may require modified heat treatment **Physical Properties (Typical):** - **Density:** 0.284 lb/in³ (7,850 kg/m³) - **Modulus of Elasticity:** 29,000 ksi (200 GPa) - **Thermal Conductivity:** 28.5 W/m·K at 100°C - **Specific Heat:** 450 J/kg·K at 100°C #### **4. Product Applications** ASTM A533 Grade A Class 2 is utilized in extremely demanding applications where both strength and toughness are critical: **Nuclear Power Components:** - Reactor pressure vessels (heavy-wall sections) - Nuclear steam supply system components - Pressurizers and steam generators - Primary circuit containment structures **High-Pressure Vessels:** - Hydrocracking reactors - Ammonia converters - Methanol synthesis reactors - High-pressure gas storage vessels **Special Applications:** - Heavy-wall chemical process reactors - Offshore platform components - Critical structural supports in aggressive environments #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-2** | 13MnNiMo5-5 | Similar strength level | | **Europe** | **EN 10028-2** | 13MnNiMo5-5 | Close mechanical properties | | **Japan** | **JIS G3120** | SOV 2B | Comparable nuclear grade | | **Germany** | **SEP 1380** | 13MnNiMo54 | Similar application scope | **Technical Comparison with Class 1:** | Parameter | Class 1 | Class 2 | |-----------|---------|---------| | **Yield Strength** | 50 ksi min | 70 ksi min | | **Tensile Strength** | 80-100 ksi | 90-110 ksi | | **Application Focus** | General pressure vessels | Heavy-section nuclear vessels | #### **6. Fabrication & Quality Assurance** **Welding Considerations:** - **Pre-heat temperature:** 300-400°F (150-200°C) - **Post-weld heat treatment:** 1100-1150°F (595-620°C) - **Welding processes:** SMAW, SAW, GTAW with low-hydrogen electrodes - **Welder qualification:** Per ASME Section IX requirements **Quality Control Requirements:** - **Ultrasonic testing:** Per ASTM A578 Level II or higher - **Impact testing:** Multiple locations for thick sections - **Tension tests:** From each end of thick plates - **Heat treatment records:** Complete documentation required **Special Nuclear Requirements:** - **Supplementary requirements:** S1 to S18 as specified - **Fabrication procedures:** Per ASME Section III - **Material traceability:** Complete from melt to final product --- **Key Advantages:** - **Superior strength-to-toughness ratio** in heavy sections - **Excellent radiation resistance** for nuclear applications - **Proven performance** in critical service conditions - **Well-established fabrication guidelines** **Design Considerations:** - Section size effects on mechanical properties - Proper heat treatment cycle control - Weld procedure qualification for specific applications - Non-destructive examination requirements **Disclaimer:** This information is for reference purposes. For nuclear applications, consult ASME Section III and applicable nuclear regulatory requirements. Material selection should be verified by qualified engineers for specific applications. -:- For detailed product information, please contact sales. -: ASTM A533 Low Alloy Steel, Grade A, Class 2 Specification Dimensions Size： Diameter 20-1000 mm Length <4424 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 2 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A533 Low Alloy Steel Flange, Grade A, Class 2 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A533 Low Alloy Steel Flange, Grade A, Class 2 -:- For detailed product information, please contact sales. -:

Packing of ASTM A533 Low Alloy Steel Flange, Grade A, Class 2 -:- 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 895 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