ASTM A710 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 A710 Steel Flange, grade A, class 3 Product Information -:- For detailed product information, please contact sales. -: ASTM A710 Steel Flange, grade A, class 3 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A710 Steel, grade A, class 3 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A710 Steel, Grade A, Class 3** #### **1. Overview** ASTM A710/A710M is the standard specification for **Age-Hardening, Low-Carbon Nickel-Copper-Chromium-Molybdenum-Columbium (Niobium) Alloy Structural Steel**. **Grade A, Class 3** represents a specific processing variant of this advanced high-strength, low-alloy (HSLA) steel, supplied in the **as-rolled (normalized) and precipitation hardened (aged) condition**. This thermomechanical processing route yields a material with a well-balanced combination of **high strength, excellent low-temperature toughness, superior weldability, and cost-effectiveness**, making it suitable for a broad range of structural and pressure applications. #### **2. International Standard** The primary governing standard is **ASTM A710/A710M - Standard Specification for Age-Hardening, Low-Carbon Nickel-Copper-Chromium-Molybdenum-Columbium Alloy Structural Steel**. The "Class 3" designation explicitly denotes material that has undergone **precipitation heat treatment (aging) following hot rolling**. This differentiates it from the solution-treated Class 2 and other classes. Other relevant standards include: * **ASTM A435/A435M:** Standard Specification for Straight-Beam Ultrasonic Examination of Steel Plates. * **ASTM A578/A578M:** Standard Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications. * **AWS D1.1/D1.1M:** Structural Welding Code - Steel. * **ASME Boiler and Pressure Vessel Code, Section II, Part A:** Often references this grade for pressure vessel construction. #### **3. Chemical Composition (Heat Analysis)** The chemical composition for Grade A, Class 3 is identical to other Grade A classes, centered on a very low carbon base with strategic alloying additions to facilitate precipitation hardening. *Typical Composition Ranges (Weight %):* | Element | Grade A, Class 3 | | :--- | :--- | | Carbon (C) | ≤ 0.07 | | Manganese (Mn) | 0.40 - 0.70 | | Phosphorus (P) | ≤ 0.025 | | Sulfur (S) | ≤ 0.025 | | Silicon (Si) | 0.15 - 0.35 | | Nickel (Ni) | 0.70 - 1.00 | | Copper (Cu) | 1.00 - 1.30 | | Chromium (Cr) | 0.40 - 0.80 | | Molybdenum (Mo) | 0.15 - 0.25 | | Columbium (Cb/Nb) | 0.02 - 0.10 | | **Carbon Equivalent (CE)** | **Exceptionally low (~0.34-0.38 per IIW formula), ensuring excellent weldability.** | #### **4. Mechanical & Physical Properties** The as-rolled (normalized) structure, followed by aging, provides a fine-grained microstructure that delivers the required strength and toughness. *Guaranteed Minimum Mechanical Properties (Per ASTM A710/A710M):* | Property | Value (Typical for Plate) | | :--- | :--- | | Yield Strength (min) | 70 ksi (485 MPa) | | Tensile Strength (min) | 85 ksi (585 MPa) | | Elongation in 2 in (min) | 18% | | **Charpy V-Notch Impact Energy** | | | Test Temperature | **-100°F (-73°C)** | | Minimum Avg. Energy | **40 ft-lbf (54 J)** | *Note: Like other Grade A classes, Class 3 is required to meet the same minimum impact toughness of 40 ft-lbf at -100°F, indicating excellent low-temperature performance.* *Typical Physical Properties:* * Density: ~0.284 lb/in³ (7.85 g/cm³) * Modulus of Elasticity: 29,000 ksi (200 GPa) * Poisson's Ratio: 0.29 * Coefficient of Thermal Expansion: 6.5 x 10⁻⁶ /°F (11.7 x 10⁻⁶ /°C) #### **5. Product Applications** ASTM A710 Grade A, Class 3 is utilized in applications where the combination of moderate-high strength, exceptional toughness, and ease of fabrication is critical, but where the full solution heat treatment of Class 2 may not be required for all property aspects. * **Pressure Vessels:** Widely used for pressure vessels and heat exchangers in petrochemical, refining, and power generation industries, especially for low-temperature service. * **Structural Components:** Heavy construction, mining equipment, and offshore platform components (non-node applications) that benefit from its high strength-to-weight ratio and good toughness. * **Shipbuilding:** Hull structures, decks, and bulkheads for commercial and naval vessels, particularly those operating in cold climates. * **Storage Tanks:** For storage of chemicals and gases at moderate to low temperatures. * **General Fabricated Machinery:** Components requiring high strength and good impact resistance without complex post-forming heat treatments. #### **6. Key Characteristics & Advantages** * **Excellent Weldability:** The ultra-low carbon content and low Carbon Equivalent (CE) allow this steel to be welded with minimal preheat requirements in most thicknesses, reducing fabrication costs and complexity. * **Good Low-Temperature Toughness:** Maintains high impact energy down to -100°F, making it suitable for a wide range of sub-zero temperature applications. * **Cost-Effective Production:** The Class 3 (as-rolled + aged) processing is generally more economical than the full solution heat treatment of Class 2, offering a favorable balance of properties and cost. * **Age-Hardening Simplicity:** Achieves its final strength through a relatively simple precipitation hardening treatment, which minimizes distortion compared to quench and temper processes. * **Good Corrosion Resistance:** Copper and chromium additions provide enhanced atmospheric corrosion resistance compared to plain carbon steels. **Conclusion:** ASTM A710 Grade A, Class 3 is a versatile and high-performance age-hardening steel that offers an optimal balance of **strength, toughness, weldability, and manufacturing economy**. By leveraging a hot-rolled microstructure subsequently strengthened by precipitation hardening, it provides a robust and fabricator-friendly material solution. It is an excellent choice for engineers and fabricators involved in pressure equipment, structural projects, and marine applications where reliable performance at low temperatures and simplified welding procedures are key drivers for project success and cost management. -:- For detailed product information, please contact sales. -: ASTM A710 Steel, grade A, class 3 Specification Dimensions Size： Diameter 20-1000 mm Length <5702 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 A710 Steel, grade A, class 3 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A710 Steel Flange, grade A, class 3 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A710 Steel Flange, grade A, class 3 -:- For detailed product information, please contact sales. -:

Packing of ASTM A710 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 2173 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