ASTM A131 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 A131 Steel Flange, grade A Product Information -:- For detailed product information, please contact sales. -: ASTM A131 Steel Flange, grade A Synonyms -:- For detailed product information, please contact sales. -:

ASTM A131 Steel, grade A Product Information -:- For detailed product information, please contact sales. -: ### **Technical Data Sheet: ASTM A131 / A131M Steel, Grade A** **Product Overview** ASTM A131 / A131M is a standard specification for structural steel used in ship construction. Grade A is a general-purpose mild carbon steel grade designed for various marine structural applications. This steel exhibits good weldability, formability, and toughness at ambient temperatures, making it suitable for ship hulls and marine structures where moderate strength is required. --- #### **1. International Standards & Designations** | Standard Organization | Designation | | :--- | :--- | | **ASTM International** | **A131 / A131M Grade A** | | **UNS (Unified Numbering System)** | **K02502** | | **ABS (American Bureau of Shipping)** | **Grade A** | | **European Norm (EN)** | **EURONORM 177** (Equivalent) | | **Japanese (JIS)** | **KA Class** | --- #### **2. Chemical Composition (Weight %)** | Element | Composition (%) | | :--- | :--- | | **Carbon (C)** | 0.21 max | | **Manganese (Mn)** | 2.5 x C (min), 0.80-1.20 (typical) | | **Phosphorus (P)** | 0.035 max | | **Sulfur (S)** | 0.035 max | | **Silicon (Si)** | 0.10-0.35 | | **Copper (Cu)** | 0.35 min (when specified) | | **Iron (Fe)** | Balance | **Key Composition Features:** - **Low Carbon Content**: Ensures good weldability and formability - **Manganese-Carbon Ratio**: Provides adequate strength and toughness - **Controlled Impurities**: Low phosphorus and sulfur for improved ductility --- #### **3. Typical Physical & Mechanical Properties** **Physical Properties:** - **Density**: 7.85 g/cm³ (0.284 lb/in³) - **Melting Point**: ~1425-1540°C (2600-2800°F) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Poisson's Ratio**: 0.29 - **Coefficient of Thermal Expansion**: 11.5 × 10⁻⁶ /K (20-100°C) - **Thermal Conductivity**: 51.9 W/m·K **Mechanical Properties (Per ASTM A131):** - **Tensile Strength**: 400-490 MPa (58-71 ksi) - **Yield Strength**: 235 MPa (34 ksi) min - **Elongation**: 22% min in 200 mm, 25% min in 50 mm - **Charpy V-Notch Impact**: 20 J (15 ft-lb) min at 0°C (32°F) --- #### **4. Product Applications** **Shipbuilding Industry:** - Ship hull structures - Deck plating - Bulkheads - Framing components **Marine Structures:** - Offshore platforms - Dock gates - Floating structures - Harbor equipment **General Construction:** - Marine-grade structural components - Coastal building structures - Bridge components in marine environments --- #### **5. Manufacturing & Fabrication** **Heat Treatment:** - Typically supplied in as-rolled condition - Normalizing available when specified - Stress relieving when required **Welding Characteristics:** - Excellent weldability using all standard processes - No pre-heat required for most thicknesses - Post-weld heat treatment optional **Forming & Machining:** - Good cold forming properties - Excellent shearability and punchability - Suitable for bending and rolling operations --- #### **6. Quality Assurance & Testing** ASTM A131 mandates: - Chemical analysis for each heat - Tensile testing - Charpy V-notch impact testing - Non-destructive testing when specified - Dimensional verification --- #### **7. Corrosion Performance** - **Atmospheric Corrosion**: Good resistance in marine environments - **Corrosion Rate**: Approximately 0.1-0.2 mm/year in seawater - **Protection**: Typically used with coating systems or cathodic protection --- **Technical Notes:** - Grade A is the most commonly used grade for general shipbuilding - Suitable for service temperatures down to 0°C (32°F) - Requires proper corrosion protection in marine environments - Compatible with most marine coating systems *This information is for reference purposes. For complete requirements, consult the latest ASTM A131/A131M specification and applicable regulatory body rules (ABS, DNV, LR, etc.).* -:- For detailed product information, please contact sales. -: ASTM A131 Steel, grade A Specification Dimensions Size： Diameter 20-1000 mm Length <4220 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 A131 Steel, grade A Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A131 Steel Flange, grade A -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A131 Steel Flange, grade A -:- For detailed product information, please contact sales. -:

Packing of ASTM A131 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 691 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