ASTM A308 Coated Steel Flange

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 A308 Coated Steel Flange Product Information -:- For detailed product information, please contact sales. -: ASTM A308 Coated Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

ASTM A308 Coated Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A308 Coated Steel** **ASTM A308** is a specification for rectangular and square **zinc-coated (galvanized)** steel products, primarily used for applications requiring corrosion protection. This standard covers steel that has been hot-dip coated with zinc to provide a protective barrier against environmental corrosion, making it suitable for outdoor and corrosive environments. --- #### **1. International Standards & Classification** **Primary Standard:** **ASTM A308** - "Standard Specification for Steel, Rectangular and Square Zinc-Coated (Galvanized) for Applications Requiring Corrosion Resistance" **Coating Classification:** - **Commercial Coating**: Standard zinc coating thickness - **Heavy Coating**: Enhanced zinc coating for severe environments **International Equivalents:** - **EN 10346**: DX51D+Z - **JIS G 3302**: SGCC - **GB/T 2518**: DX51D+Z - **ISO 3575**: Commercial Quality (CQ) --- #### **2. Base Material Chemical Composition** The typical base steel composition for ASTM A308: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.15 | | Manganese (Mn) | 0.60 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.040 | | Silicon (Si) | 0.30 | **Key Composition Features:** - **Low Carbon Steel**: Base material for formability and weldability - **Zinc Coating**: Primary corrosion protection mechanism - **Commercial Quality**: Balanced for general applications - **Formability Focused**: Optimized for post-coating fabrication --- #### **3. Physical & Mechanical Properties** **Base Material Mechanical Properties:** | Property | Value | |---|---| | **Tensile Strength** | 310-450 MPa (45-65 ksi) | | **Yield Strength (min.)** | 230 MPa (33 ksi) | | **Elongation (min.)** | 20% | **Coating Properties:** - **Coating Weight**: 100-550 g/m² (typical) - **Coating Adherence**: Must withstand bending without flaking - **Coating Uniformity**: Consistent coverage required - **Surface Finish**: Spangled appearance typical **Physical Properties:** - **Density**: 7.85 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Thermal Conductivity**: 60.5 W/m·K (zinc coating affects overall) - **Coefficient of Thermal Expansion**: 23.0 × 10⁻⁶/°C (zinc) --- #### **4. Product Applications** **Construction and Building:** - Structural framing members - Roofing and siding supports - Building hardware components - Architectural elements **Industrial Applications:** - Equipment guards and enclosures - Support brackets and frames - Machinery components - Industrial platform components **Agricultural Equipment:** - Farm building components - Equipment structural members - Storage facility structures - Outdoor agricultural applications **Infrastructure:** - Highway signage supports - Guard rail components - Utility pole brackets - Outdoor structural applications --- #### **5. Fabrication Characteristics** **Forming Performance:** - **Good Formability**: Suitable for bending and moderate forming - **Coating Integrity**: Must maintain coating during fabrication - **Bend Radius**: Typically 1-2t depending on coating thickness - **Cutting Considerations**: Coating may affect tool life **Welding Characteristics:** - **Weldable with Care**: Requires proper ventilation due to zinc fumes - **Recommended Processes**: GMAW, GTAW with proper technique - **Precautions**: Zinc coating may cause porosity if not properly handled - **Post-Weld Treatment**: May require touch-up of damaged coating **Coating Performance:** - **Corrosion Protection**: Zinc provides sacrificial protection - **Coating Durability**: Resistant to handling and moderate impact - **Environmental Resistance**: Suitable for outdoor exposure - **Maintenance**: Generally low maintenance requirements **Quality Assurance:** - **Coating Weight Tests**: Measurement of zinc coating mass - **Adherence Testing**: Bend tests to verify coating bond - **Visual Inspection**: Surface quality and coating uniformity - **Dimensional Checks**: Compliance with specified tolerances --- ### **Technical Summary** ASTM A308 coated steel represents a cost-effective solution for applications requiring reliable corrosion protection in various environmental conditions. The hot-dip galvanized coating provides both barrier protection and sacrificial cathodic protection, significantly extending the service life of steel components exposed to corrosive environments. The specification covers commercial quality steel that has been optimized for post-coating fabrication, allowing for moderate forming and welding operations while maintaining coating integrity. The zinc coating not only provides corrosion resistance but also offers a clean, attractive appearance suitable for both industrial and architectural applications. This material is particularly valuable for outdoor structures, agricultural equipment, and industrial components where regular maintenance painting is impractical or uneconomical. The self-healing properties of zinc coating (through sacrificial protection) ensure continued corrosion resistance even at cut edges or minor coating damage areas. ASTM A308 galvanized steel has established itself as a versatile and reliable material across multiple industries, offering an optimal balance between corrosion performance, mechanical properties, fabrication characteristics, and cost-effectiveness for applications requiring durable, low-maintenance steel components in corrosive service environments. -:- For detailed product information, please contact sales. -: ASTM A308 Coated Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4357 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 A308 Coated Steel Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A308 Coated Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A308 Coated Steel Flange -:- For detailed product information, please contact sales. -:

Packing of ASTM A308 Coated Steel Flange -:- 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 828 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