Medium-Silicon Ductile Iron Flange, heat-resistant ductile Iron 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. -: Medium-Silicon Ductile Iron Flange, heat-resistant ductile Iron Flange Product Information -:- For detailed product information, please contact sales. -: Medium-Silicon Ductile Iron Flange, heat-resistant ductile Iron Flange Synonyms -:- For detailed product information, please contact sales. -:

Medium-Silicon Ductile Iron, heat-resistant ductile iron Product Information -:- For detailed product information, please contact sales. -: ## **Product Introduction: Medium-Silicon Heat-Resistant Ductile Iron (Ferritic Si-Mo Ductile Iron)** Medium-Silicon Heat-Resistant Ductile Iron, most notably represented by **Silicon-Molybdenum (Si-Mo) ductile iron**, is a high-performance ferritic grade specifically engineered to deliver an exceptional combination of high-temperature strength, oxidation resistance, and thermal fatigue resistance. By alloying with elevated silicon and strategic additions of molybdenum, this material stabilizes a fully ferritic matrix while dramatically improving its performance at elevated temperatures, typically in the range of **600°C to 800°C (1110°F to 1470°F)**. Unlike standard ductile iron, which rapidly loses strength and suffers from growth and scaling above 400°C, Si-Mo ductile iron maintains its structural integrity, making it a preferred material for complex, load-bearing components in demanding thermal environments. This alloy successfully bridges the gap between standard ductile iron and expensive high-nickel austenitic grades, offering a cost-effective solution with superior room and elevated temperature toughness compared to gray iron counterparts. --- ### **1. Chemical Composition** Heat resistance is achieved through a ferrite-stabilizing, solid-solution strengthening approach with silicon, augmented by molybdenum for high-temperature strength. **Typical Composition Range (e.g., Common Si-Mo Grade):** | Element | Content (%) | Primary Function in Heat Resistance | | :--- | :--- | :--- | | **Silicon (Si)** | **3.50 - 4.50** | **Primary alloying element.** Raises the ferrite-to-austenite transformation temperature (A₁ point), stabilizing a fully ferritic matrix up to higher temperatures. This eliminates pearlite decomposition and associated growth. It also promotes a protective SiO₂-rich surface scale. | | **Molybdenum (Mo)** | **0.40 - 1.00** | **Key strengthener.** Provides potent solid solution strengthening and forms stable carbides, significantly improving high-temperature tensile strength, yield strength, and creep resistance without promoting pearlite. | | **Carbon (C)** | 3.00 - 3.80 | Ensures full nodularization for ductility. Higher carbon can improve castability but is balanced against carbide formation. | | **Manganese (Mn)** | **≤ 0.30** | **Kept deliberately low.** High Mn stabilizes pearlite, which is detrimental to long-term growth resistance. Low Mn is critical for stabilizing ferrite. | | **Chromium (Cr)** | ≤ 0.10 (Optional, trace) | Typically avoided or minimized, as it can promote pearlite and harmful chromium carbides, reducing toughness and thermal conductivity. | | **Magnesium (Mg)** | 0.03 - 0.06 | Essential nodularizing element for spheroidal graphite formation. | | **Iron (Fe)** | Balance | Base metal. | **Microstructural Note:** The ideal microstructure is a **fully ferritic matrix** with a uniform distribution of **well-nodularized, spheroidal graphite (Type VI, >80% nodularity)**. The absence of pearlite, carbides (except fine Mo-carbides), and free ferrite in the as-cast condition is crucial and is often achieved through a ferritizing annealing heat treatment. --- ### **2. Physical & Mechanical Properties at Room & Elevated Temperature** This material is characterized by its excellent property retention at high temperatures, stemming from its stable ferritic-nodular structure. | Property | Typical Value / Description | | :--- | :--- | | **Microstructure** | Fully ferritic matrix with spheroidal graphite. | | **Density** | ~7.0 - 7.1 g/cm³ | | **Tensile Strength (Room Temp)** | **450 - 600 MPa (65 - 87 ksi)** | | **Yield Strength (0.2% Offset, Room Temp)** | **350 - 500 MPa (51 - 73 ksi)** | | **Elongation (Room Temp)** | **10 - 20%** – Maintains significant ductility. | | **Hardness (Room Temp)** | **170 - 230 HB** | | **Impact Resistance (Charpy V-Notch)** | **12 - 20 J (9 - 15 ft-lbf)** at room temperature. | | **Maximum Service Temperature** | **Up to 800°C (1470°F)** in air for long-term service. Short-term peaks to 850°C are possible. | | **Growth Resistance** | **Excellent.** Dimensional change after 1000 hours at 700°C is typically <0.1%. | | **Oxidation/Scaling Resistance** | **Very Good.** Forms a protective, adherent silicon-rich oxide scale. Superior to unalloyed ductile iron. | | **Thermal Conductivity** | Good (~30 W/m·K). Lower than low-Si ductile iron but better than austenitic grades. Aids in heat dissipation. | | **Thermal Shock Resistance** | **Excellent.** The combination of good ductility, moderate strength, good conductivity, and the nodular graphite structure provides outstanding resistance to cracking from thermal cycles. | | **Creep & Rupture Strength** | **Very Good.** Mo addition provides excellent resistance to deformation under load at high temperatures. | | **Fatigue Strength** | High, both at room and elevated temperatures. | --- ### **3. Key Product Advantages & Characteristics** * **High Strength & Ductility at Temperature:** Uniquely combines useful tensile/creep strength with good toughness up to 800°C. * **Exceptional Thermal Fatigue Resistance:** The premier choice for components subjected to severe thermal cycling (e.g., exhaust manifolds). * **Stable Microstructure:** Fully ferritic matrix ensures no detrimental phase changes during heating/cooling, preventing growth. * **Good Castability and Machinability:** Easier to cast than high-alloy grades and can be machined with standard tools. * **Cost-Performance Leader:** Offers the best balance of high-temperature performance, room-temperature properties, and cost among heat-resistant ductile irons. --- ### **4. Product Applications** This material is the industry standard for high-integrity, thermally cycled, load-bearing components in automotive and industrial sectors. * **Automotive & Truck:** **Turbocharger housings** and **exhaust manifolds** for gasoline and diesel engines, especially for high-performance and heavy-duty applications. EGR coolers and components. * **Power Generation:** Components for exhaust gas recirculation systems, turbine housings, and heat shields. * **Industrial Furnaces:** Fixtures, jigs, and handling components subject to both load and thermal cycles. * **Hydraulics & Machinery:** High-pressure valve bodies and pumps operating in hot environments. --- ### **5. International Standards** While not as universally codified as some grades, Si-Mo ductile iron is recognized in major automotive and general engineering standards. | Standard | Title / Scope | Common Designations / Notes | | :--- | :--- | :--- | | **ISO 1083** | *Austenitic cast irons – Classification* (General) | Often specified under **ISO 1083/JS/600-10** with the requirement of Si>3.4% and Mo addition, designated as a **special grade**. | | **EN 1563** | *Founding – Spheroidal graphite cast irons* (European) | **EN-GJS-SiMo 4-1** or **EN-GJS-SiMo 5-1** (e.g., GJS-500-14 with SiMo). The material number system allows for specification of Si and Mo ranges. | | **SAE J1887** | *Heat Resistant Ferritic Si-Mo Ductile Iron Castings for Turbocharger Housings* | The key **automotive standard**. Defines grades like **SiMo 4.0-1.0** and **SiMo 5.0-1.0** with strict chemical and mechanical property requirements for turbo applications. | | **ASTM A897/A897M** | *Standard Specification for Austempered Ductile Iron* | While for ADI, its compositional guidelines often overlap. Si-Mo grades are typically specified by proprietary or customer specifications in the US, referencing **SAE J1887**. | | **GB/T 26656** | *Silicon Molybdenum Heat Resistant Spheroidal Graphite Cast Iron* (Chinese) | Directly standardizes grades like **RQTSi4Mo** and **RQTSi5Mo**. | **Specification Note:** For critical applications like turbochargers, the **SAE J1887** standard is predominant. Procurement typically requires specification of the **grade (e.g., SiMo 4.0-1.0)**, mechanical properties at room temperature, and often **high-temperature property validation** (e.g., tensile strength at 700°C). --- ### **Conclusion** Medium-Silicon (Si-Mo) Heat-Resistant Ductile Iron is a metallurgically sophisticated, ferritic-grade material that sets the benchmark for **high-temperature mechanical performance in thermally cycled components**. Its **fully ferritic matrix, stabilized by high silicon and strengthened by molybdenum**, delivers an unparalleled combination of **thermal fatigue resistance, growth resistance, and retained strength/ductility** in the 600-800°C range. As the **material of choice for modern high-performance exhaust manifolds and turbocharger housings**, it demonstrates how alloy design in ductile iron can meet the extreme demands of advanced thermal-mechanical engineering, offering a reliable and cost-optimized alternative to more expensive cast steels or nickel alloys. -:- For detailed product information, please contact sales. -: Medium-Silicon Ductile Iron, heat-resistant ductile iron Specification Dimensions Size： Diameter 20-1000 mm Length <6486 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. -: Medium-Silicon Ductile Iron, heat-resistant ductile iron Properties -:- For detailed product information, please contact sales. -:

Applications of Medium-Silicon Ductile Iron Flange, heat-resistant ductile Iron Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers Medium-Silicon Ductile Iron Flange, heat-resistant ductile Iron Flange -:- For detailed product information, please contact sales. -:

Packing of Medium-Silicon Ductile Iron Flange, heat-resistant ductile Iron 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 2957 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