ASTM A737 Steel Flange, Grade B

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 A737 Steel Flange, Grade B Product Information -:- For detailed product information, please contact sales. -: ASTM A737 Steel Flange, Grade B Synonyms -:- For detailed product information, please contact sales. -:

ASTM A737 Steel, Grade B Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ASTM A737 Grade B High-Strength Low-Alloy (HSLA) Steel** **ASTM A737 Grade B** is a high-strength, low-alloy structural steel plate engineered for **welded bridges, buildings, and other structural applications requiring excellent strength-to-weight ratios and good toughness**. This grade offers a **minimum yield strength of 50 ksi (345 MPa)** and is distinguished by its **enhanced atmospheric corrosion resistance** (approximately two times that of carbon steel), making it a preferred choice for exposed structural applications where painting may be undesirable or impractical. The steel achieves its properties through **microalloying with vanadium, niobium, or nitrogen** in combination with controlled rolling practices, typically supplied in the **as-rolled or normalized condition**. --- ## **International Standard & Key Specifications** * **Primary Standard:** **ASTM A737/A737M** - Standard Specification for Pressure Vessel Plates, High-Strength Low-Alloy Steel. * **Note:** Despite its title reference to "pressure vessel plates," A737 is widely specified for **structural applications**, particularly in bridge construction, due to its combination of strength, weldability, and atmospheric corrosion resistance. * **Key Related Standards:** * **AASHTO M222M/M222:** Commonly referenced for bridge construction (Grade 50). * **ASTM A6/A6M:** Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling. * **AWS D1.1/D1.5:** Structural Welding Code – Steel / Bridges. * **Heat Treatment:** Typically supplied in the **as-rolled (AR) or normalized (N)** condition, with mechanical properties verified accordingly. --- ## **Chemical Composition (Weight %, max unless range is specified)** The composition is designed to provide enhanced atmospheric corrosion resistance while achieving the specified strength through microalloying and controlled rolling. | Element | Composition (%) | Role in Performance | | :--- | :--- | :--- | | **Carbon (C)** | 0.20 max | Controls strength and weldability; kept moderate for good fabricability. | | **Manganese (Mn)** | 1.35 max | Primary strengthener and hardenability agent. | | **Phosphorus (P)** | 0.04 max | Enhances atmospheric corrosion resistance but limited for weldability. | | **Sulfur (S)** | 0.05 max | Impurity, controlled for improved ductility and weldability. | | **Silicon (Si)** | 0.15 - 0.50 | Deoxidizer and solid solution strengthener. | | **Copper (Cu)** | **0.20 min (when specified)** | **Primary corrosion-resisting element**; forms protective patina in weathering steels. | | **Nickel (Ni)** | 0.25 - 0.50 (when specified) | Enhances toughness and complements Cu's corrosion resistance. | | **Chromium (Cr)** | 0.40 - 0.70 (when specified) | Contributes to corrosion resistance and hardenability. | | **Vanadium (V)** | 0.02 - 0.10 | **Primary microalloying element** for precipitation strengthening and grain refinement. | | **Columbium (Cb/Nb)** | 0.005 - 0.05 | Alternative microalloy for grain refinement and precipitation strengthening. | | **Nitrogen (N)** | 0.015 max (when V is used) | Combines with V to form strengthening vanadium nitride precipitates. | **Key Distinction:** A737 Grade B is often produced as a **weathering steel** when Cu, Ni, and Cr are specified, developing a protective oxide layer when exposed to atmospheric conditions. --- ## **Typical Physical & Mechanical Properties** Properties are for as-rolled or normalized plates, depending on the ordered condition. | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | 485 - 620 MPa (70,000 - 90,000 psi) | | **Yield Strength (min)** | **345 MPa (50,000 psi)** | | **Elongation in 2-in (50 mm) (min)** | 21% | | **Modulus of Elasticity** | 200 GPa (29,000 ksi) | | **Density** | 7.85 g/cm³ (0.284 lb/in³) | | **Charpy V-Notch Impact Toughness** | **Test Temperature:** Often specified at **40°F (4°C), 0°F (-18°C), or -40°F (-40°C)** depending on service requirements. **Minimum Avg. Energy:** Typically 15-25 ft-lbf (20-34 J) at specified temperature. | | **Atmospheric Corrosion Resistance** | Approximately **2 times** greater than plain carbon steel (when Cu-bearing composition is specified). | | **Brinell Hardness (typical)** | 180 - 220 HBW | --- ## **Product Applications** ASTM A737 Grade B is widely used in structural applications where a combination of strength, durability, and corrosion resistance is valued, particularly in transportation infrastructure. **Primary Structural Applications:** 1. **Bridge Construction:** * **Plate Girders** for highway and railway bridges. * **Truss Members** and **Cross-frames**. * **Support Structures** for signage and lighting. 2. **Building Construction:** * **Structural Framing** for industrial buildings and warehouses. * **Exposed Architectural Elements** where the weathering steel aesthetic is desired. * **Crane Runway Girders** and support structures. 3. **Transportation Infrastructure:** * **Support Structures** for traffic signals and overhead signs. * **Guardrail Posts** and **Bridge Rails**. * **Frame Components** for heavy trucks and trailers. 4. **Industrial Structures:** * **Transmission Towers** and **Power Pole Structures**. * **Material Handling Equipment** frames. * **Unpainted Storage Racks** and support structures. --- ## **Advantages and Fabrication Considerations** * **Advantages:** * **Excellent Strength-to-Weight Ratio:** 50 ksi yield strength enables lighter, more efficient structural designs. * **Enhanced Corrosion Resistance:** Weathering steel version develops a protective patina, reducing maintenance costs for exposed structures. * **Good Weldability:** Moderate carbon content and controlled microalloying result in good weldability with proper procedures. * **Good Toughness:** Available with impact toughness suitable for various climatic conditions. * **Fabrication & Design Considerations:** * **Welding Requirements:** **Low-hydrogen welding practices are recommended** (e.g., SMAW with E7018, FCAW with appropriate wire). Proper preheat is essential for thicker sections. * **Weathering Steel Application:** When used as weathering steel, design must ensure proper drainage and ventilation to allow uniform patina formation and prevent moisture trapping. * **Initial Runoff:** Weathering steel produces rust runoff during the first few years of exposure, which may stain adjacent surfaces; this should be considered in design. * **Not for Continuous Immersion:** Not recommended for constantly wet or submerged applications where the protective patina cannot form properly. * **Galvanic Corrosion:** Must be isolated from dissimilar metals to prevent accelerated corrosion. **In summary, ASTM A737 Grade B is a versatile high-strength low-alloy steel that provides an excellent balance of structural strength, good toughness, and enhanced atmospheric corrosion resistance. Its availability in weathering steel compositions makes it particularly valuable for exposed infrastructure applications where reduced maintenance and distinctive aesthetics are important considerations, though it requires proper design detailing and fabrication practices to achieve optimal performance.** -:- For detailed product information, please contact sales. -: ASTM A737 Steel, Grade B Specification Dimensions Size： Diameter 20-1000 mm Length <4532 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 A737 Steel, Grade B Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A737 Steel Flange, Grade B -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A737 Steel Flange, Grade B -:- For detailed product information, please contact sales. -:

Packing of ASTM A737 Steel Flange, Grade B -:- 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 1003 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