ASTM A572 Steel Flange, grade 45

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 A572 Steel Flange, grade 45 Product Information -:- For detailed product information, please contact sales. -: ASTM A572 Steel Flange, grade 45 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A572 Steel, grade 45 Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A572 / A572M Grade 45 Steel** **Product Overview** ASTM A572 Grade 45 is a **high-strength low-alloy (HSLA) structural steel** strengthened primarily through **columbium (niobium) or vanadium microalloying**. It offers a guaranteed **minimum yield strength of 45 ksi (310 MPa)** along with excellent weldability and improved atmospheric corrosion resistance compared to plain carbon steels. As a versatile and economical alternative to ASTM A36, Grade 45 provides approximately 25% higher yield strength, enabling lighter, more efficient structural designs while maintaining good fabricability. It is produced to precise chemical and mechanical property requirements and is available in plates, bars, and structural shapes in various heat-treated conditions. **Key International Standards** * **Primary Standard:** **ASTM A572 / A572M** - Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel. * **Governing Specification:** This product conforms to all requirements for **Grade 45**. * **Microalloying System:** Achieves strength via fine grain refinement and precipitation strengthening from controlled additions of **Columbium (Cb/Nb)** or **Vanadium (V)**, or a combination of both. * **Heat Treatment:** Typically supplied in the **as-rolled** condition for shapes and bars, and **as-rolled, normalized, or stress-relieved** for plates, depending on thickness and producer practice. * **Related Standards:** Widely accepted in international specifications. Comparable to **JIS G3141 SPFC 45** and aligns with the performance requirements of **EN 10025-4 S355N/NL** for normalized material. **Chemical Composition (Weight % - ASTM A572 Grade 45 Requirements)** Chemistry is tightly controlled to ensure consistent performance and weldability. | Element | Requirement (Max, unless noted) | Purpose & Note | | :--- | :--- | :--- | | **Carbon (C)** | 0.26% | Controlled for weldability. | | **Manganese (Mn)** | 1.35% | Solid solution strengthening. | | **Phosphorus (P)** | 0.04% | Impurity control. | | **Sulfur (S)** | 0.05% | Impurity control. | | **Silicon (Si)** | 0.40% | Deoxidizer. | | **Columbium (Cb/Nb)** | 0.05% Max (if added) | Primary microalloy for grain refinement. | | **Vanadium (V)** | 0.15% Max (if added) | Alternative/co-microalloy for precipitation strengthening. | | **Carbon Equivalent (C.E. IIW)** | -- | Typically 0.40 - 0.46, indicating good weldability. | **Physical & Mechanical Properties** | Property | Requirement (ASTM A572 Grade 45) | Typical Performance / Notes | | :--- | :--- | :--- | | **Yield Strength (Min)** | 45 ksi (310 MPa) | Typically 50 - 60 ksi (345 - 414 MPa) | | **Tensile Strength** | 60 ksi (415 MPa) min | Typically 65 - 75 ksi (448 - 517 MPa) | | **Elongation in 2" (Min)** | 21% | Good ductility for forming. | | **Yield-to-Tensile Ratio** | Not specified, but favorable. | Typically 0.70 - 0.80. | | **Modulus of Elasticity** | ~29,000 ksi (200 GPa) | Standard for steel. | | **Atmospheric Corrosion Resistance** | Approximately **2x that of carbon steel (A36)** due to Cu content (0.20% min when specified). | Optional but common. | | **Key Feature** | **Optimized Microalloyed Value Grade:** Delivers a reliable 45 ksi yield point with superior consistency, weldability, and toughness compared to older carbon-manganese grades like A440/A441, thanks to modern microalloying technology. | **Product Applications** ASTM A572 Grade 45 is a preferred material for a wide range of structural applications where enhanced performance over A36 is desired. * **Building Construction:** Columns, beams, trusses, and base plates in commercial and industrial buildings. * **Bridge Construction:** Girders, floor beams, and secondary members. * **Transmission & Communication Towers:** Lattice structures and poles. * **Heavy Equipment:** Frames, booms, and structural members for agricultural and construction machinery. * **Transportation:** Truck frames, trailer components, and railcar structures. * **General Fabrication:** For any component where upgrading from A36 allows for weight savings or increased load capacity. **Advantages & Fabrication Notes** * **Excellent Weldability:** The controlled carbon content and microalloying result in a moderate carbon equivalent. Standard welding processes (SMAW, GMAW, FCAW) with low-hydrogen practices are suitable. Preheating is generally not required for thin to moderate sections under normal conditions. * **Good Formability & Toughness:** The fine-grained microstructure provides good cold bending characteristics and better notch toughness than equivalent-strength carbon steels. * **Cost-Effective Strength:** Provides a significant strength increase over A36 at a minimal cost premium, offering excellent value in structural design. * **Consistent Properties:** Microalloying ensures uniform mechanical properties and fine grain size, leading to predictable performance in fabrication and service. * **Surface & Condition:** Available in standard mill finishes. Plates can be specified as normalized for thicker sections to ensure through-thickness properties. **Disclaimer:** This datasheet describes **ASTM A572 Grade 45**, a modern, widely available HSLA steel. For procurement, specify the **standard (A572), grade (45), product form (plate, bar, shape)**, and any supplementary requirements such as **impact testing (ASTM A6 S1)** or **fine austenitic grain practice (ASTM A6 S5)** if needed for low-temperature service or critical applications. This grade has largely replaced older grades like A440 and A441 for new construction. Always confirm with the supplier the available delivery conditions (as-rolled vs. normalized) for plates, as this can affect properties in thicker sections. Design values should be taken from the appropriate governing code (e.g., AISC Manual). -:- For detailed product information, please contact sales. -: ASTM A572 Steel, grade 45 Specification Dimensions Size： Diameter 20-1000 mm Length <4716 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 A572 Steel, grade 45 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A572 Steel Flange, grade 45 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A572 Steel Flange, grade 45 -:- For detailed product information, please contact sales. -:

Packing of ASTM A572 Steel Flange, grade 45 -:- 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 1187 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