ASTM A662 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 A662 Carbon Steel Flange, Grade A Product Information -:- For detailed product information, please contact sales. -: ASTM A662 Carbon Steel Flange, Grade A Synonyms -:- For detailed product information, please contact sales. -:

ASTM A662 Carbon Steel, Grade A Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ASTM A662/A662M Carbon-Manganese-Silicon Steel Plate, Grade A** ## **1. Overview & International Standard** **ASTM A662/A662M Grade A** is a carbon-manganese-silicon steel plate designed specifically for **moderate and lower temperature service** in welded pressure vessels and other critical structures. Unlike high-strength low-alloy (HSLA) steels, it relies on a balanced carbon-manganese composition to achieve its properties and is supplied in the **normalized** heat treatment condition to ensure consistent microstructure and enhanced toughness, particularly at sub-zero temperatures. **Primary Standard:** **ASTM A662/A662M** - *Standard Specification for Pressure Vessel Plates, Carbon-Manganese-Silicon Steel, for Moderate and Lower Temperature Service.* Grade A is one of several grades (A, B, C) defined by different mechanical property levels. **Key International Equivalents & References:** * **EN 10028-4: P275NL2 / P275NL1** (European standard for normalized fine grain pressure vessel steels for low-temperature service). * **ISO 9328-2:** Steel flat products for pressure purposes. * It is frequently adopted and approved for construction under the **ASME Boiler and Pressure Vessel Code, Section II** as **SA-662 Grade A**. * **JIS G 3115: SMA 410 C** (Japanese standard for carbon steel plates for pressure vessels for intermediate and moderate temperature service). **Core Manufacturing & Heat Treatment:** Grade A plates are **normalized**. This involves heating the steel above its critical temperature (typically around 1650°F / 900°C) and air cooling. This process refines the grain structure, homogenizes the microstructure, and significantly improves toughness, especially impact resistance at lower service temperatures. --- ## **2. Chemical Composition (Weight %, Ladle Analysis)** The composition is designed to provide good weldability and respond effectively to normalizing heat treatment. It is a relatively simple, lean alloy. | Element | Composition (%) - Grade A | | :--- | :--- | | Carbon (C) | 0.17 - 0.22 | | Manganese (Mn) | 0.70 - 1.00 | | Phosphorus (P) | 0.025 max | | Sulfur (S) | 0.025 max | | Silicon (Si) | 0.15 - 0.40 | | **Carbon Equivalent (CE IIW)** | **~0.35 - 0.42** (Calculated as C + Mn/6) | *Note:* The balanced **carbon and manganese** provide solid strength and hardenability. The **silicon** acts primarily as a deoxidizer ("killed steel"), ensuring a sound internal structure. The carbon equivalent is moderate, indicating fair weldability, but preheating is still often required for thicker sections. --- ## **3. Mechanical & Physical Properties** ### **A. Mandatory Mechanical Properties (Normalized Condition):** | Property | Value - Grade A | | :--- | :--- | | **Minimum Yield Strength (0.2% offset)** | 50 ksi (345 MPa) | | **Tensile Strength** | 70 - 85 ksi (485 - 585 MPa) | | **Minimum Elongation in 2-in (50 mm)** | 22% | | **Charpy V-Notch Impact Toughness (Key Requirement)** | **Mandatory.** Specimen must meet minimum energy absorption at a specified low temperature. For **Grade A**, the standard test temperature is **-50°F (-46°C)**.
• **Minimum Average for 3 specimens:** 15 ft-lbf (20 J)
• **Minimum Single specimen:** 12 ft-lbf (16 J) | ### **B. Key Features & Advantages:** * **Guaranteed Low-Temperature Toughness:** The normalized condition and specified chemistry ensure reliable impact resistance down to -50°F, making it suitable for refrigerated and低温service. * **Good Weldability:** Its moderate carbon content and carbon equivalent allow for good weldability using common arc welding processes with standard precautions. * **Cost-Effective for Service Range:** Provides a reliable, economical material solution for a wide range of moderate and低温pressure vessel applications where high-alloy steels are not necessary. * **Established Performance:** Long history of safe and reliable use in coded pressure equipment. ### **C. Typical Physical Properties:** * **Density:** 0.284 lb/in³ (7,850 kg/m³) * **Modulus of Elasticity:** 29 x 10⁶ psi (200 GPa) * **Coefficient of Thermal Expansion:** 6.5 x 10⁻⁶/°F (11.7 x 10⁻⁶/°C) * **Thermal Conductivity:** ~45 W/m·K (approx., at room temperature) * **Specific Heat:** ~450 J/kg·K --- ## **4. Product Forms & Availability** * **Form:** Rolled steel plates. * **Thickness Range:** Commonly available from about 0.25 inches (6 mm) up to 4 inches (100 mm) or more, as the normalizing process is effective across thick sections. * **Condition:** Supplied in the **normalized heat treatment condition**. This is a mandatory requirement to achieve the specified mechanical properties, particularly the impact toughness. --- ## **5. Primary Applications** ASTM A662 Grade A is predominantly used in the construction of pressure vessels and storage tanks for services where metal temperatures fall within its certified range. * **Pressure Vessels for Petrochemical & Gas Industries:** * Separators, scrubbers, and receivers operating at moderate to低温. * Vessels in ammonia, urea, and methanol plants. * **Low-Temperature Storage & Transportation:** * Tanks for storing liquefied gases such as **ammonia (NH₃)**, propane, and butane. * Transportation tanks (railcar, truck) for pressurized gases that are not deeply cryogenic (i.e., not LNG or LIN). * **Power Generation:** * Feedwater heaters, deaerators, and other vessels in power plants. * **General Process Industry:** * Various coded pressure vessels for food processing, pharmaceuticals, and chemical processing where operating temperatures may occasionally fall below ambient. --- ## **6. Fabrication Considerations** * **Welding:** Standard welding processes (SMAW, GMAW, SAW) are applicable. Use of low-hydrogen electrodes and practices is strongly recommended. **Preheating** is required for thicker sections (typically > ¾ inch or 19 mm) to prevent hydrogen-induced cracking and to control cooling rates. Post-Weld Heat Treatment (PWHT/stress relieving) is often specified for finished vessels. * **Forming:** Exhibits good hot-forming characteristics. Cold forming is possible but may require subsequent stress relief if deformation is severe. * **Cutting:** Can be cut by all conventional methods (oxy-fuel, plasma, waterjet). For oxy-fuel cutting, preheating may be necessary on thicker plates to prevent cracking. * **Machining:** Has good machinability typical of normalized carbon-manganese steels. --- ## **Summary** **ASTM A662 Grade A** is a **standardized, normalized carbon-manganese steel** that provides a reliable and **cost-effective solution for moderate and lower temperature pressure vessel applications**. Its primary value lies in its **guaranteed Charpy impact toughness at -50°F**, a property ensured by the mandatory normalizing heat treatment. While not as strong as HSLA steels nor as tough as nickel-alloy steels for cryogenic service, it fills a vital niche in industrial equipment design, offering a proven balance of **adequate strength, good fabricability, and certified low-temperature performance** for a wide range of process and storage applications. It is a fundamental material in the toolkit of pressure vessel engineers. -:- For detailed product information, please contact sales. -: ASTM A662 Carbon Steel, Grade A Specification Dimensions Size： Diameter 20-1000 mm Length <4511 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 A662 Carbon Steel, Grade A Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A662 Carbon Steel Flange, Grade A -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A662 Carbon Steel Flange, Grade A -:- For detailed product information, please contact sales. -:

Packing of ASTM A662 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 982 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