ASTM A678 Steel Flange, grade C

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 A678 Steel Flange, grade C Product Information -:- For detailed product information, please contact sales. -: ASTM A678 Steel Flange, grade C Synonyms -:- For detailed product information, please contact sales. -:

ASTM A678 Steel, grade C Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A678 Grade C Steel** **ASTM A678 Grade C** is a premium high-strength quenched and tempered carbon steel plate designed for the most demanding structural applications. Representing one of the highest strength levels in the A678 specification, Grade C delivers exceptional mechanical properties combined with reliable toughness, making it suitable for critical components where maximum strength-to-weight ratio and structural efficiency are paramount. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A678/A678M** - "Standard Specification for Quenched-and-Tempered Carbon Steel Plates for Structural Applications" **Grade Classification:** - **Grade C** - Minimum yield strength 70 ksi (485 MPa) - Other grades in A678 series: A, B, D **International Equivalents:** - **EN 10025-6**: S620Q/S620QL - **JIS G3106**: SM570 - **GB/T 16270**: Q620 - **ISO 4950-3**: EQ620 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A678 Grade C: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.25 | | Manganese (Mn) | 1.20-1.60 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.040 | | Silicon (Si) | 0.15-0.50 | | Copper (Cu) | 0.35 (when specified) | **Key Composition Features:** - **Elevated Carbon Content**: Provides maximum strength capabilities - **High Manganese Range**: Ensures deep hardenability and strength - **Optimized Silicon**: Enhances strength and oxidation resistance - **Copper Addition**: Optional for improved corrosion performance --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thicknesses up to 2.5 inches/63 mm):** | Property | Value | |---|---| | **Tensile Strength** | 760-895 MPa (110-130 ksi) | | **Yield Strength (min.)** | 485 MPa (70 ksi) | | **Elongation in 2" (min.)** | 16% | | **Elongation in 8" (min.)** | 18% | **Impact Toughness Properties:** - **Charpy V-Notch Test Temperature**: 70°F (21°C) - **Minimum Impact Energy**: 20 ft-lbf (27 J) **Physical Properties:** - **Density**: 7.85 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Poisson's Ratio**: 0.29 - **Thermal Conductivity**: 46.5 W/m·K - **Coefficient of Thermal Expansion**: 11.9 × 10⁻⁶/°C - **Specific Heat Capacity**: 470 J/kg·K --- #### **4. Product Applications** **Critical Structural Components:** - Bridge tension members - High-rise building structural elements - Long-span roof structures - Seismic-resistant construction **Heavy Mining Equipment:** - Excavator boom and arm sections - Mining shovel structural components - Dragline machine members - Crusher frame structures **Energy Infrastructure:** - Wind turbine tower flanges - Power plant critical supports - Hydroelectric dam components - Nuclear plant structural members **Transportation Systems:** - Railway bridge compression members - Heavy-haul vehicle frames - Port crane structural components - Specialized transport equipment **Industrial Machinery:** - Heavy press frames and platens - Large machine tool structures - Industrial robot base frames - Specialized equipment supports --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Fair Weldability**: Requires strict procedure control - **Preheat Requirements**: 300-400°F (150-200°C) minimum - **Recommended Processes**: SMAW, GMAW, FCAW (low-hydrogen only) - **Filler Metals**: E110XX or E120XX series electrodes **Forming & Machining:** - **Limited Formability**: Restricted to simple bending operations - **Minimum Bend Radius**: 3.5t for 90° bends - **Machinability**: Poor (approximately 40% of B1112 steel) - **Cutting Methods**: Waterjet and laser cutting recommended **Heat Treatment:** - Supplied in quenched and tempered condition - Maximum hardness: 341 HBW - Through-thickness property consistency verified **Quality Assurance:** - Mandatory Charpy V-Notch impact testing - Multiple test locations through thickness - Complete mechanical property certification - Ultrasonic testing available when specified --- ### **Technical Summary** ASTM A678 Grade C represents the pinnacle of quenched and tempered carbon steel plate technology, offering exceptional strength characteristics for the most demanding structural applications. With a minimum yield strength of 70 ksi, this grade provides maximum weight reduction potential while maintaining structural integrity under extreme loading conditions. The advanced heat treatment process ensures optimal combination of high strength and adequate toughness, making Grade C particularly valuable for applications where material efficiency and performance under stress are critical. The carefully controlled chemical composition provides the necessary hardenability while maintaining reasonable weldability with proper procedures. This premium grade is specifically engineered for critical infrastructure projects, heavy mining equipment, and advanced energy applications where failure is not an option. While requiring sophisticated fabrication techniques and rigorous quality control, ASTM A678 Grade C delivers unmatched performance in severe service conditions, establishing it as the material of choice for engineers designing next-generation structural systems where safety, reliability, and performance are paramount considerations. -:- For detailed product information, please contact sales. -: ASTM A678 Steel, grade C Specification Dimensions Size： Diameter 20-1000 mm Length <4308 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 A678 Steel, grade C Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A678 Steel Flange, grade C -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A678 Steel Flange, grade C -:- For detailed product information, please contact sales. -:

Packing of ASTM A678 Steel Flange, grade C -:- 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 779 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