ASTM A537 Carbon Steel Flange, Class 1

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 A537 Carbon Steel Flange, Class 1 Product Information -:- For detailed product information, please contact sales. -: ASTM A537 Carbon Steel Flange, Class 1 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A537 Carbon Steel, Class 1 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A537 Class 1: Heat-Treated Carbon-Manganese-Silicon Steel Plate** #### **1. Overview** ASTM A537 Class 1 is a **heat-treated carbon-manganese-silicon steel plate** specifically designed for **pressure vessel applications** requiring improved notch toughness and higher strength than provided by as-rolled carbon steels. This class covers plates that are typically supplied in the **normalized heat treatment condition**, offering an excellent balance of strength, toughness, and weldability for moderate and low-temperature service. #### **2. Chemical Composition** The chemical composition is optimized for normalized heat treatment: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.24 max | | Manganese (Mn) | 0.70 - 1.60 | | Phosphorus (P) | 0.035 max | | Sulfur (S) | 0.035 max | | Silicon (Si) | 0.15 - 0.50 | | Copper (Cu) | 0.35 max (when specified) | **Key Composition Features:** - **Moderate Carbon Content**: Provides good strength while maintaining excellent weldability - **Manganese Enhancement**: Improves hardenability and strength-toughness relationship - **Silicon Control**: Ensures proper deoxidation and strength development - **Low Residual Elements**: Promote better impact toughness and fabricability #### **3. Physical & Mechanical Properties** **Mechanical Properties (Normalized Condition):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 65 - 85 ksi (450 - 585 MPa) | | **Yield Strength** | 45 ksi min (310 MPa min) | | **Elongation in 2 inches** | 24% min | | **Charpy V-Notch Impact** | 20 ft-lb min at -60°F (-51°C) | **Thickness Limitations:** - **Maximum thickness**: 2½ inches (65 mm) for normalized treatment - **Thickness effect**: Properties may vary with section size - **Testing requirements**: Based on nominal thickness **Physical Properties (Typical):** - **Density**: 0.284 lb/in³ (7,850 kg/m³) - **Modulus of Elasticity**: 29,000 ksi (200 GPa) - **Poisson's Ratio**: 0.29 - **Thermal Conductivity**: 45 W/m·K at 100°C - **Thermal Expansion**: 6.5 × 10⁻⁶/°F (11.7 × 10⁻⁶/°C) #### **4. Product Applications** ASTM A537 Class 1 is widely specified for various pressure vessel and structural applications: **Pressure Vessel Applications:** - Storage tanks for petroleum products - Chemical process vessels - Heat exchangers and boiler components - Industrial pressure containers **Structural Components:** - Building and bridge construction - Offshore structure components - Heavy equipment manufacturing - Mining and material handling systems **Low-Temperature Service:** - Refrigerated storage tanks - Cold climate structural applications - Low-temperature process equipment - Cryogenic service components #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-2** | P355NH | Similar normalized steel grade | | **Europe** | **EN 10028-3** | P355NH | Normalized fine grain steel | | **Japan** | **JIS G3115** | SPV 355 | Pressure vessel steel equivalent | | **China** | **GB 19189** | 14Cr1MoR | Similar application scope | **Class Comparison within A537:** | Parameter | Class 1 | Class 2 | |-----------|---------|---------| | **Heat Treatment** | Normalized | Normalized or Q&T | | **Yield Strength** | 45 ksi min | 50 ksi min | | **Tensile Strength** | 65-85 ksi | 70-90 ksi | | **Max Thickness** | 2½ inches | 6 inches | #### **6. Fabrication & Quality Assurance** **Welding and Fabrication:** - **Excellent weldability** with conventional processes - **Pre-heat recommended** for thicknesses over 1 inch (25 mm) - **Low-hydrogen practice** advised for critical applications - **Post-weld heat treatment** optional based on design requirements **Heat Treatment:** - **Normalizing temperature**: 1550-1650°F (845-900°C) - **Grain refinement**: Achieved through controlled normalizing - **Property consistency**: Ensured through proper heat treatment - **Certification**: Heat treatment records required **Quality Control:** - **Impact testing**: Required at specified temperatures - **Tension tests**: From each heat and heat treatment charge - **Chemical analysis**: For each melt of steel - **Supplementary testing**: Available as specified --- **Technical Advantages:** - **Improved toughness** over as-rolled carbon steels - **Good strength-to-weight ratio** - **Excellent fabricability** and formability - **Cost-effective** solution for pressure vessel applications **Design Considerations:** - **Minimum service temperature** limitations - **Heat treatment effects** on final properties - **Fabrication sequence** planning - **Quality verification** through testing **Application Guidelines:** - Suitable for **ASME Section VIII** pressure vessel construction - Appropriate for **moderate low-temperature service** - Compatible with **various welding processes** - Adaptable to **multiple fabrication methods** **Disclaimer:** This information is for technical reference only. For pressure vessel applications, consult the latest ASTM A537 specification and applicable construction codes. Material selection and fabrication procedures should be approved by qualified engineers and comply with all relevant regulatory requirements. -:- For detailed product information, please contact sales. -: ASTM A537 Carbon Steel, Class 1 Specification Dimensions Size： Diameter 20-1000 mm Length <4436 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 A537 Carbon Steel, Class 1 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A537 Carbon Steel Flange, Class 1 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A537 Carbon Steel Flange, Class 1 -:- For detailed product information, please contact sales. -:

Packing of ASTM A537 Carbon Steel Flange, Class 1 -:- 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 907 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