ASTM A724 Carbon Steel Flange, Grade A

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 A724 Carbon Steel Flange, Grade A Product Information -:- For detailed product information, please contact sales. -: ASTM A724 Carbon Steel Flange, Grade A Synonyms -:- For detailed product information, please contact sales. -:

ASTM A724 Carbon Steel, Grade A Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ASTM A724 Grade A Carbon Steel Plate for Pressure Vessels** **ASTM A724 Grade A** is a specialized **carbon-manganese-silicon steel plate** intended specifically for **welded layered pressure vessels**. It is characterized by a unique manufacturing process: plates are produced to be subsequently **split (divided) into two or more layers** during fabrication. This split-layer construction technique allows for the creation of exceptionally thick-walled vessels with superior through-thickness properties and residual stress management. Grade A is the base strength grade within this specification, offering a robust combination of strength, weldability, and cost-effectiveness for high-pressure applications in the chemical, petrochemical, and power industries. --- ## **International Standard & Key Specifications** * **Primary Standard:** **ASTM A724 / A724M** - Standard Specification for Pressure Vessel Plates, Carbon-Manganese-Silicon Steel, for Quenched-and-Tempered Layered Pressure Vessels. * **Governing Standard:** The standard includes mandatory requirements for simulated post-weld heat treatment (SPWHT) testing to ensure stability of properties after fabrication. * **Key Processing Requirement:** Plates are supplied in the **quenched-and-tempered (Q&T) condition**, providing a uniform, fine-grained tempered martensitic or bainitic microstructure essential for the splitting process and final performance. * **ASME Code Equivalent:** **SA-724 / SA-724M** in ASME Boiler and Pressure Vessel Code, Section II, Part A, for ASME-stamped equipment. --- ## **Chemical Composition (Weight %, max unless range is specified)** The composition is tightly controlled to achieve the required hardenability for quenching and to ensure good weldability and notch toughness. Grade A has the following typical limits: | Element | Composition (%) | | :--- | :--- | | **Carbon (C)** | 0.15 - 0.21 | | **Manganese (Mn)** | 1.00 - 1.35 | | **Phosphorus (P)** | 0.025 | | **Sulfur (S)** | 0.025 | | **Silicon (Si)** | 0.15 - 0.50 | | **Nickel (Ni)** | 0.40 (optional, for enhanced toughness) | | **Chromium (Cr)** | 0.25 | | **Molybdenum (Mo)** | 0.08 | | **Vanadium (V)** | 0.05 | | **Copper (Cu)** | 0.35 | **Key Notes:** * The carbon and manganese ranges are optimized to ensure sufficient hardenability for the Q&T process while maintaining a low carbon equivalent for weldability. * Low levels of Cr, Mo, and V may be present from the base steel; their combined total is limited. --- ## **Typical Physical & Mechanical Properties** Properties are for quenched-and-tempered plates, as tested in the longitudinal direction. | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | 550 - 690 MPa (80,000 - 100,000 psi) | | **Yield Strength (min)** | **345 MPa (50,000 psi)** | | **Elongation in 2-in (50 mm) (min)** | 18% | | **Reduction of Area (min)** | 38% | | **Modulus of Elasticity** | ~200 GPa (29 x 10⁶ psi) | | **Density** | ~7.85 g/cm³ (0.284 lb/in³) | | **Charpy V-Notch Impact Toughness** | **Test Temperature:** **-30°F (-34°C)**. **Minimum Avg. for 3 Specimens:** 20 ft·lbf (27 J). **Minimum Single Value:** 15 ft·lbf (20 J). | | **Simulated PWHT Requirement:** | Mechanical properties must be met **after** a simulated post-weld heat treatment (typically 1150°F ± 25°F / 620°C ± 14°C for a specified time), ensuring stability during vessel fabrication. | --- ## **Product Applications** ASTM A724 Grade A is an engineered material for a specific, high-end fabrication technique: **multilayer (wrapped or layered) pressure vessel construction.** **Primary Applications:** 1. **High-Pressure Process Vessels:** * **Ammonia Converters** and synthesis reactors in fertilizer plants. * **Methanol Synthesis Reactors.** * **Hydrocrackers** and **Hydrotreaters** in oil refineries. * **High-Pressure Separators** and **Scrubbers.** 2. **Gas Storage & Transportation:** * **Large-diameter, high-pressure vessels** for gas storage (e.g., hydrogen, natural gas). * **Tube trailers** and stationary storage banks for industrial gases. 3. **Power Generation:** * **Hydrogen Coolers** and associated high-pressure vessels in power plants. **Advantages of the Split-Layer (A724) Construction:** * **Superior Through-Thickness Properties:** The splitting process creates a fine grain structure on the split faces, improving short-transverse properties. * **Residual Stress Mitigation:** Layered construction results in lower through-thickness residual stresses compared to monolithic thick plates, enhancing resistance to stress corrosion cracking (SCC). * **Fabrication Flexibility:** Allows construction of vessels with diameters and thicknesses that are impractical with forged or rolled monolithic shells. * **Safety:** The layered design can inherently limit crack propagation. --- ## **Advantages and Critical Fabrication Considerations** * **Advantages:** * **Proven Performance for Critical Service:** Designed for severe high-pressure, high-temperature hydrogen service and other demanding environments. * **Excellent Toughness:** Guaranteed CVN properties at -30°F ensure performance in low-temperature startups or upsets. * **Stable Properties:** The mandatory SPWHT requirement guarantees mechanical properties after fabrication heat treatment. * **Critical Fabrication & Welding Considerations:** * **Specialized Fabrication:** Requires fabricators experienced in multilayer vessel techniques (shrink-fitting, layering, banding). * **Stringent Welding Protocols:** **Mandatory use of low-hydrogen processes and procedures.** Welding Procedure Specifications (WPS) must be qualified to account for the Q&T base metal. * **Post-Weld Heat Treatment (PWHT):** A full PWHT cycle is a standard part of vessel fabrication, following the parameters used in the plate's simulation test. * **Not a General-Purpose Plate:** It is a premium, application-specific material. Its cost and processing are justified only for the unique advantages of layered construction. **In summary, ASTM A724 Grade A is a high-performance, quenched-and-tempered carbon steel plate engineered exclusively for the demanding requirements of welded multilayer pressure vessels. Its guaranteed properties after simulated PWHT, combined with the inherent benefits of layered construction, make it a critical material for the safe and reliable containment of high-pressure processes in the energy and chemical industries.** -:- For detailed product information, please contact sales. -: ASTM A724 Carbon Steel, Grade A Specification Dimensions Size： Diameter 20-1000 mm Length <4518 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 A724 Carbon Steel, Grade A Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A724 Carbon Steel Flange, Grade A -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A724 Carbon Steel Flange, Grade A -:- For detailed product information, please contact sales. -:

Packing of ASTM A724 Carbon Steel Flange, Grade A -:- 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 989 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