ASTM A148 Grade 80-50 Cast 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 A148 Grade 80-50 Cast Steel Flange Product Information -:- For detailed product information, please contact sales. -: ASTM A148 Grade 80-50 Cast Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

ASTM A148 Grade 80-50 Cast Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Technical Datasheet: ASTM A148 Grade 80-50 Cast Steel** ## **1. Product Overview** **ASTM A148 Grade 80-50** is a **medium-strength carbon steel casting** and one of the most commonly specified grades within the ASTM A148 standard series. As the lowest strength grade in this specification, it offers an excellent balance of strength, ductility, weldability, and machinability, making it a versatile and cost-effective choice for a wide range of structural and general engineering applications. The grade designation "80-50" indicates minimum tensile strength (**80 ksi / 550 MPa**) and minimum yield strength (**50 ksi / 345 MPa**) requirements. Castings are typically supplied in the normalized, normalized and tempered, or annealed condition. ## **2. Governing International Standard** This grade is fully defined under **ASTM A148 / A148M – Standard Specification for Steel Castings, High Strength, for Structural Purposes**. It serves as the baseline grade within this multi-grade standard, which primarily classifies cast steels by their mechanical properties. ## **3. Typical Chemical Composition** ASTM A148 emphasizes mechanical properties over strict chemical composition for this grade, allowing foundries flexibility. A typical, economical composition is as follows (in weight %, maximum unless range is given): * **Carbon (C):** 0.25 - 0.35% * **Manganese (Mn):** 0.60 - 1.00% * **Silicon (Si):** 0.30 - 0.60% * **Phosphorus (P):** 0.035% max * **Sulfur (S):** 0.035% max * **Residual Alloys:** Generally a plain carbon steel; may contain residual amounts of Cr, Ni, Mo (<0.50% total) but is not intentionally highly alloyed. **Note:** Chemistry can be adjusted by the foundry to achieve the required mechanical properties in the relevant casting section size. ## **4. Physical & Mechanical Properties** * **Minimum Mechanical Properties (as per ASTM A148):** * **Tensile Strength:** 80 ksi (550 MPa) * **Yield Strength (0.2% Offset):** 50 ksi (345 MPa) * **Elongation in 2" (50 mm):** 22% * **Reduction of Area:** 35% * **Typical Achieved Properties (After Normalizing or Annealing):** * **Hardness:** 156 - 207 HBW (Brinell Hardness) * **Modulus of Elasticity:** 29 x 10⁶ psi (200 GPa) * **Poisson's Ratio:** 0.29 * **Density:** 7.85 g/cm³ * **Charpy V-Notch Impact Energy:** Typically >20 J at room temperature. * **Common Heat Treatments:** **Normalizing** is the most common treatment to refine the grain structure and achieve consistent properties. **Annealing** may be used for maximum machinability and stress relief. **Normalizing and Tempering** can provide an optimized balance of strength and toughness. ## **5. Key Characteristics & Engineering Advantages** * **Excellent Ductility and Toughness:** Its high elongation and reduction of area values make it resistant to brittle fracture and suitable for components with moderate impact loads. * **Good Weldability:** This is one of its most significant advantages. It can be readily welded using common arc welding processes (SMAW, GMAW, FCAW) with standard low-carbon steel filler metals. Preheating (150-300°F / 65-150°C) is recommended for thick sections, but post-weld heat treatment is not always mandatory. * **Excellent Machinability:** Its moderate hardness and carbon content make it one of the easiest grades within the A148 series to machine, allowing for good surface finishes and higher production rates. * **Cost-Effectiveness:** As a plain carbon steel with simple heat treatment requirements, it is generally the most economical grade in the A148 series. * **Balance of Properties:** Provides a reliable combination of strength, ductility, and manufacturability for non-critical or moderately stressed components. ## **6. Typical Applications** Grade 80-50 is widely used across industries for structural components that do not require the ultra-high strength of the premium grades: * **General Machinery & Equipment:** Gearbox housings, pump casings, machine tool bases, support brackets, and frames. * **Material Handling:** Pulleys, sheaves, hoist components, conveyor system frames, and medium-duty hooks. * **Construction & Infrastructure:** Bridge bearing components, construction machinery housings, and structural supports. * **Railroad:** Coupler yokes, draft lugs, and other non-wearing structural parts. * **Valves & Piping:** Medium-pressure valve bodies and flanges (for non-corrosive services). * **Marine & Offshore:** Deck machinery components, non-critical structural fittings. ## **7. Summary** **ASTM A148 Grade 80-50** is the fundamental, workhorse grade of the high-strength structural cast steel family. It is selected not for ultimate strength, but for its superior combination of **fabricability, toughness, and cost-effectiveness**. Its excellent weldability and machinability make it ideal for complex fabrications and components requiring significant post-casting machining. When design requirements call for reliable performance at moderate stress levels with an emphasis on manufacturability and total cost, Grade 80-50 is often the optimal and most practical choice. -:- For detailed product information, please contact sales. -: ASTM A148 Grade 80-50 Cast Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5855 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 A148 Grade 80-50 Cast Steel Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A148 Grade 80-50 Cast Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A148 Grade 80-50 Cast Steel Flange -:- For detailed product information, please contact sales. -:

Packing of ASTM A148 Grade 80-50 Cast 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 2326 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