ASTM A572 Steel Flange, grade 50

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 50 Product Information -:- For detailed product information, please contact sales. -: ASTM A572 Steel Flange, grade 50 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A572 Steel, grade 50 Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A572 / A572M Grade 50 Steel** **Product Overview** ASTM A572 Grade 50 is a **high-strength low-alloy (HSLA) structural steel** that is the **industry standard** for modern construction requiring enhanced strength and reliability. Strengthened through **columbium (niobium) or vanadium microalloying**, it offers a guaranteed **minimum yield strength of 50 ksi (345 MPa)** alongside excellent weldability, improved toughness, and superior consistency compared to older carbon-manganese steels like A36 or A440. As the most commonly specified grade in the A572 family, Grade 50 provides approximately 40% higher yield strength than A36, enabling significant material savings, lighter structures, and more efficient designs across virtually all structural applications. It is available in plates, structural shapes (beams, channels, angles), and bars. **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 50**, the most widely used grade in the standard. * **Microalloying System:** Achieves its strength through controlled additions of **Columbium (Cb/Nb)**, **Vanadium (V)**, or a combination. These elements refine the grain structure and provide precipitation strengthening. * **Heat Treatment:** Typically supplied in the **as-rolled** condition for shapes and bars, and **as-rolled or normalized** for plates. Normalizing is often applied to thicker plates to ensure uniform through-thickness properties. * **Related & Interchangeable Standards:** * **A992 for Wide-Flange Shapes:** In the United States, **ASTM A992** (Fy = 50 ksi) is the preferred specification for rolled structural wide-flange shapes, superseding A572 Grade 50 for that product form due to stricter toughness and maximum yield-to-tensile ratio limits. * Internationally comparable to grades like **JIS G3106 SM490** and **EN 10025-2 S355JR** (though S355JR has a slightly lower nominal yield of 355 MPa). **Chemical Composition (Weight % - ASTM A572 Grade 50 Requirements)** Chemistry is balanced to achieve strength while maintaining excellent fabricability. | Element | Requirement (Max, unless noted) | Purpose & Note | | :--- | :--- | :--- | | **Carbon (C)** | 0.23% | Low for good 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 grain refiner. | | **Vanadium (V)** | 0.15% Max (if added) | Precipitation strengthener. | | **Copper (Cu)** | 0.20% min (when atmospheric corrosion resistance is specified) | Optional. | | **Carbon Equivalent (C.E. IIW)** | -- | Typically 0.38 - 0.45, indicating **excellent weldability**. | **Physical & Mechanical Properties** | Property | Requirement (ASTM A572 Grade 50) | Typical Performance & Significance | | :--- | :--- | :--- | | **Yield Strength (Min)** | 50 ksi (345 MPa) | Typically 55 - 65 ksi (380 - 450 MPa) | | **Tensile Strength** | 65 ksi (450 MPa) min | Typically 70 - 80 ksi (483 - 552 MPa) | | **Elongation in 2" (Min)** | 21% | Good ductility. | | **Yield-to-Tensile Ratio (Max for A992)** | 0.85 (per A992) | Controlled for seismic ductility in modern shapes. | | **Modulus of Elasticity** | ~29,000 ksi (200 GPa) | Standard for steel. | | **Atmospheric Corrosion Resistance** | ~2x carbon steel (if Cu ≥ 0.20% specified). | An optional but beneficial feature. | | **Key Feature** | **The Modern Structural Workhorse:** Represents the optimal balance of strength (50 ksi yield), fabricability (excellent weldability/formability), consistent quality, and cost-effectiveness for the vast majority of structural steel applications. | **Product Applications** ASTM A572 Grade 50 is the default material for primary structural framing in countless projects worldwide. * **Building Construction:** Columns, beams, girders, trusses, and base plates in commercial, industrial, and institutional buildings. * **Bridge Construction:** Primary girders, floor beams, truss members, and diaphragms. * **Heavy Equipment & Machinery:** Frames, booms, chassis, and structural supports for construction, mining, and agricultural equipment. * **Transmission & Communication Towers:** Primary structural members. * **Transportation:** Truck and trailer frames, railcar underframes, and shipping container corner posts. * **Industrial Structures:** Platforms, walkways, stair towers, and pipe supports. **Advantages & Fabrication Notes** * **Superior Weldability:** Its low carbon equivalent makes it one of the most weldable structural steels available. Standard procedures (SMAW, GMAW, FCAW, SAW) with low-hydrogen consumables are used. **Preheat is generally not required** for material less than 1 inch thick under normal conditions, per AWS D1.1. * **Excellent Formability & Toughness:** The fine-grained microstructure from microalloying provides good cold bending capability and improved notch toughness over older steels, making it suitable for a wide range of fabrication processes. * **Proven Reliability & Availability:** As the industry standard, it is produced by mills worldwide, ensuring consistent quality, comprehensive design data, and extensive fabrication experience. * **Cost Performance:** Offers the best value for achieving 50 ksi yield strength, with minimal premium over A36 but significant structural benefits. **Disclaimer:** This datasheet describes **ASTM A572 Grade 50**, the preeminent structural steel grade. For procurement: * For **plates and bars**, specify **ASTM A572 Grade 50**. * For **rolled wide-flange, channel, and angle shapes**, specify **ASTM A992** (which has tighter controls on chemistry and properties for seismic performance). * Always include any required supplementary requirements, such as **impact testing (ASTM A6 S1)** for low-temperature service or fracture-critical members, and **ultrasonic testing (ASTM A6 S4)** for thick plates. * Verify with the mill/supplier whether plates are supplied as-rolled or normalized, especially for thicknesses over 1.5 inches. This material has completely superseded obsolete grades like A440 and A441. Its properties and design values are comprehensively covered in all major design codes (AISC, AASHTO). -:- For detailed product information, please contact sales. -: ASTM A572 Steel, grade 50 Specification Dimensions Size： Diameter 20-1000 mm Length <4717 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 50 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A572 Steel Flange, grade 50 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A572 Steel Flange, grade 50 -:- For detailed product information, please contact sales. -:

Packing of ASTM A572 Steel Flange, grade 50 -:- 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 1188 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