Compacted Graphite Cast Iron Flange (CG)

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. -: Compacted Graphite Cast Iron Flange (CG) Product Information -:- For detailed product information, please contact sales. -: Compacted Graphite Cast Iron Flange (CG) Synonyms -:- For detailed product information, please contact sales. -:

Compacted Graphite Cast Iron (CG) Product Information -:- For detailed product information, please contact sales. -: **Product Technical Data Sheet: Compacted Graphite Iron (CGI / CG Cast Iron)** **1. Product Overview** Compacted Graphite Iron (CGI), also known as Vermicular Graphite Iron, is an advanced engineering material that uniquely bridges the performance gap between conventional gray iron (GI) and ductile iron (DI). It is characterized by a distinctive graphite morphology where the graphite particles are interconnected, appearing as "worm-like" or vermicular shapes under a microscope. This structure is neither fully flake-like (as in gray iron) nor spheroidal (as in ductile iron), but a controlled intermediate form. CGI delivers a superior combination of high tensile strength, good ductility and toughness, excellent thermal conductivity, and reliable fatigue performance. It is increasingly specified for high-integrity, high-stress components, particularly in the automotive and heavy machinery sectors, where it offers an optimal balance of performance, castability, and cost. **2. Governing International Standards** The classification and testing of CGI are defined by several key international standards: * **Primary Standard: ASTM A842** - *Standard Specification for Compacted Graphite Iron Castings*. This is the main ASTM specification, classifying CGI by grade based on tensile strength (e.g., Grade 350, 400, 450). * **Testing Standard: ASTM E8/E8M** - *Standard Test Methods for Tension Testing of Metallic Materials*. * **Microstructure Evaluation: ASTM A247** - *Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings*. It defines the compacted (vermicular) graphite shapes (Type III, IV). * **International Standards:** * **ISO 16112** - *Compacted (vermicular) graphite cast irons — Classification*. Defines grades (e.g., JV/JVH 350, 400, 450, 500, 600). * **EN 16079:2011** - *Founding — Compacted (vermicular) graphite cast irons*. * **GB/T 26655-2022** (China) - *Compacted (vermicular) graphite cast irons*. * **Foundry Process Control: GFA (German Foundrymen's Association) Guidelines** are often referenced for process best practices due to the tight control required. **3. Typical Chemical Composition** Achieving the compacted graphite structure requires precise control of composition and the use of specialized magnesium- or cerium-based inoculants (compacting agents). The key is to maintain a residual level of "compacting elements" (Mg, Ce, Ti) within a very narrow "processing window"—enough to prevent flake graphite but insufficient to form spheroids. | Element | Target Range (%) | Critical Role in CGI | | :--- | :--- | :--- | | **Carbon Equivalent (CE)** | 4.2 - 4.6 | Ensures castability and graphite formation. | | **Carbon (C)** | 3.5 - 3.9 | High carbon for fluidity and damping. | | **Silicon (Si)** | 1.8 - 2.7 | Promotes ferrite; adjusted for desired matrix (pearlite/ferrite ratio). | | **Magnesium (Mg)** | **0.010 - 0.025** | The most critical element. Must be tightly controlled within this "CG window". Too low → Flake Graphite; Too high → Spheroidal Graphite. | | **Cerium (Ce) / Rare Earths** | Often used with/without Mg to widen the processing window and counteract detrimental elements. | | **Sulfur (S)** | Low, < 0.02 | Must be low and stable; high S consumes Mg, making control difficult. | | **Copper (Cu)** | 0 - 1.0 | Primary pearlite promoter for strength. | | **Tin (Sn)** | 0 - 0.1 | Strong pearlite stabilizer. | | **Molybdenum (Mo)** | 0 - 0.8 | Used for increased strength, hardenability, and high-temperature stability. | **4. Physical & Mechanical Properties (Typical As-Cast or Heat-Treated)** CGI offers a unique property profile, making it a true hybrid material. | Property | Typical Range | Comparison & Notes | | :--- | :--- | :--- | | **Tensile Strength** | 350 - 600 MPa (Grades 350 - 600) | **~75% higher than equivalent gray iron**, approaching lower-grade ductile iron. | | **Yield Strength (0.2% Offset)** | 250 - 450 MPa | Excellent yield-to-tensile ratio. | | **Elongation (%)** | **3 - 10%** | **Key advantage:** Has measurable ductility (unlike brittle gray iron), though lower than high-ductility DI. | | **Modulus of Elasticity** | 140 - 165 GPa | ~20-25% higher than gray iron, closer to ductile iron and steel. Provides greater stiffness. | | **Hardness (Brinell)** | 170 - 270 HBW | Depends on matrix (ferritic, pearlitic, or austempered). | | **Thermal Conductivity** | ~36 - 42 W/m·K | **~75% of Gray Iron, but ~2x higher than Ductile Iron.** Critical for managing heat in engines. | | **Fatigue Strength (Rotating Bending)** | 200 - 260 MPa (40-50% of UTS) | **Superior to both GI and DI** at comparable tensile strength. Excellent for cyclic loading. | | **Damping Capacity** | Good | Better than DI, but lower than flake graphite GI. | | **Machinability** | Challenging | Generally more difficult than GI and ferritic DI (similar to pearlitic DI) due to its toughness and abrasive graphite shape. Requires optimized tooling and parameters. | **5. Product Applications** CGI is the material of choice for demanding applications where a combination of strength, stiffness, fatigue resistance, and thermal management is required. * **Automotive Powertrain (Primary Market):** * **Engine Blocks & Cylinder Heads:** For high-performance diesel and increasingly for gasoline engines. Superior strength allows for thinner walls (lightweighting) and higher cylinder pressures. Excellent thermal conductivity reduces hot spots and thermal fatigue. * **Exhaust Manifolds & Turbocharger Housings:** For its excellent thermal fatigue and oxidation resistance at elevated temperatures. * **Brake Discs & Drums:** For heavy-duty vehicles, offering better thermal cracking resistance than gray iron. * **Heavy-Duty & Industrial Machinery:** * **Large Gearboxes & Housings** * **Hydraulic Valve Bodies & Pump Housings** * **Press Frames & Machine Tool Bases** (where damping is still beneficial but higher stiffness is needed). * **Wind Energy:** **Gearbox Housings** for large turbines, where its high fatigue strength and stiffness under complex loading are critical. * **Railway:** **Brake Discs** and engine components. **6. Ordering & Specification Information** When specifying CGI, it is crucial to define: * **Material Grade:** Per **ASTM A842 (e.g., Grade 450)** or **ISO 16112 (e.g., JV 450)**. * **Microstructure Requirements:** Minimum percentage of compacted graphite (typically >80% CGI, with limits on nodule and flake graphite). * **Matrix Structure:** As-cast ferritic/pearlitic, or specified heat-treated condition (e.g., austempered for maximum strength and wear resistance). * **Key Performance Criteria:** E.g., minimum tensile, yield, elongation, and often a required fatigue strength or stiffness (Young's Modulus) value. -:- For detailed product information, please contact sales. -: Compacted Graphite Cast Iron (CG) Specification Dimensions Size： Diameter 20-1000 mm Length <6515 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. -: Compacted Graphite Cast Iron (CG) Properties -:- For detailed product information, please contact sales. -:

Applications of Compacted Graphite Cast Iron Flange (CG) -:- For detailed product information, please contact sales. -: Chemical Identifiers Compacted Graphite Cast Iron Flange (CG) -:- For detailed product information, please contact sales. -:

Packing of Compacted Graphite Cast Iron Flange (CG) -:- 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 2986 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