ASTM A131 Steel Flange, Grade AH32

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 AH32 Product Information -:- For detailed product information, please contact sales. -: ASTM A131 Steel Flange, Grade AH32 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A131 Steel, Grade AH32 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A131 Grade AH32 Steel** **ASTM A131 Grade AH32** is a high-strength structural steel specifically designed for marine and offshore applications. As part of the ASTM A131 specification for "Structural Steel for Ships," this grade offers enhanced strength and toughness properties suitable for critical shipbuilding components. The "AH" designation indicates it's a high-strength steel with 32 kg/mm² (315 MPa) minimum yield strength, providing excellent performance in marine environments. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A131/A131M** - "Standard Specification for Structural Steel for Ships" **Grade Classification:** - **Grade AH32** - High-strength steel with 315 MPa minimum yield strength - Other grades in A131 series: A, B, D, DS, E, CS, AH36, DH32, DH36, EH32, EH36 **International Equivalents:** - **EN 10025-4**: S355N - **JIS G3106**: SM490 - **ABS Rules**: AH32 (American Bureau of Shipping) - **LR Standards**: AH32 (Lloyd's Register) --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A131 Grade AH32: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.18 | | Manganese (Mn) | 0.90-1.60 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.035 | | Silicon (Si) | 0.50 | | Aluminum (Al) | 0.015 (min. for fine grain practice) | | Niobium (Nb) | 0.02-0.05 | | Vanadium (V) | 0.05-0.10 | **Key Composition Features:** - **Controlled Carbon**: Ensures good weldability and toughness - **Microalloying Elements**: Niobium and vanadium for precipitation strengthening - **Fine Grain Practice**: Aluminum treatment for improved toughness - **Enhanced Manganese**: Provides solid solution strengthening --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thicknesses ≤ 50 mm):** | Property | Value | |---|---| | **Tensile Strength** | 470-630 MPa (68-91 ksi) | | **Yield Strength (min.)** | 315 MPa (46 ksi) | | **Elongation in 2" (min.)** | 19% | | **Elongation in 8" (min.)** | 22% | **Impact Toughness Properties:** - **Charpy V-Notch Test Temperature**: -20°C (-4°F) - **Minimum Impact Energy**: 34 J (25 ft-lbf) - **Through-Thickness Properties**: Z-quality available when specified **Physical Properties:** - **Density**: 7.85 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Poisson's Ratio**: 0.29 - **Thermal Conductivity**: 50.5 W/m·K - **Coefficient of Thermal Expansion**: 11.8 × 10⁻⁶/°C --- #### **4. Product Applications** **Shipbuilding Applications:** - Hull structural members - Deck plating and supports - Bulkhead components - Ship frame and girder systems **Offshore Structures:** - Offshore platform components - Floating production systems - Drilling rig structures - Marine terminal facilities **Marine Engineering:** - Port and harbor structures - Dock and pier components - Marine crane structures - Shipyard facilities **Specialized Marine Applications:** - Ice-strengthened vessel components - Research vessel structures - Military shipbuilding - Luxury yacht construction --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability**: With proper procedure control - **Preheat Requirements**: 50-150°C depending on thickness - **Recommended Processes**: SMAW, GMAW, FCAW, SAW - **Filler Metals**: E7018, ER70S-6 or equivalent **Forming & Cutting:** - **Good Formability**: Suitable for shipyard forming operations - **Cold Bending**: Possible with appropriate radius - **Cutting Methods**: Plasma, laser, and oxy-fuel cutting - **Edge Preparation**: Important for welding quality **Corrosion Performance:** - **Atmospheric Corrosion**: Good with proper coatings - **Marine Environment**: Requires protective coating systems - **Cathodic Protection**: Compatible with shipboard systems **Quality Assurance:** - **Classification Society Approval**: ABS, LR, DNV, etc. - **Impact Testing**: Mandatory at specified temperatures - **Non-Destructive Testing**: UT, RT, MT as required - **Certification**: Full traceability and test reports --- ### **Technical Summary** ASTM A131 Grade AH32 represents a premium high-strength structural steel specifically engineered for marine applications. The grade's enhanced mechanical properties, combined with excellent toughness characteristics, make it particularly suitable for critical shipbuilding components where safety and reliability are paramount. The microalloyed chemistry, featuring niobium and vanadium additions, provides improved strength through precipitation hardening while maintaining good weldability. The fine grain practice ensures consistent through-thickness properties and reliable performance in dynamic marine environments. Grade AH32's 315 MPa minimum yield strength offers significant advantages in weight reduction and structural efficiency compared to conventional shipbuilding steels. This makes it particularly valuable for modern vessel designs where payload capacity, fuel efficiency, and operational performance are critical considerations. The material's compliance with major classification society requirements, combined with its proven performance in marine service, has established ASTM A131 Grade AH32 as a trusted choice for shipbuilders and marine engineers worldwide. Its balanced combination of strength, toughness, and fabrication characteristics ensures reliable performance in the demanding conditions encountered in marine and offshore applications. -:- For detailed product information, please contact sales. -: ASTM A131 Steel, Grade AH32 Specification Dimensions Size： Diameter 20-1000 mm Length <4325 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 AH32 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A131 Steel Flange, Grade AH32 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A131 Steel Flange, Grade AH32 -:- For detailed product information, please contact sales. -:

Packing of ASTM A131 Steel Flange, Grade AH32 -:- 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 796 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