High Silicon Ductile Iron Flange at RT 4Si nominal alloy content

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. -: High Silicon Ductile Iron Flange at RT 4Si nominal alloy content Product Information -:- For detailed product information, please contact sales. -: High Silicon Ductile Iron Flange at RT 4Si nominal alloy content Synonyms -:- For detailed product information, please contact sales. -:

High Silicon Ductile Iron at RT 4Si nominal alloy content Product Information -:- For detailed product information, please contact sales. -: ### **Product Technical Data Sheet: High Silicon Ductile Iron – RT Series (Nominal 4% Si)** --- #### **1. Product Overview** **High Silicon Ductile Iron (HSDI) with nominal 4% Silicon (Si)**, commonly referred to under development or proprietary designations such as **RT-4 (Room Temperature)**, represents an **advanced ferritic ductile iron alloy** engineered to overcome the traditional trade-off between strength and ductility in conventional grades. By significantly increasing the silicon content (to approximately 4.0 wt.%) while maintaining full nodularity, this alloy achieves **substantial solid solution strengthening of the ferritic matrix** without forming embrittling phases at room temperature. This results in a unique combination of **significantly elevated tensile and yield strengths, excellent high-temperature oxidation resistance, and retained good ductility and thermal conductivity**, making it ideal for elevated temperature service and high-integrity structural applications. --- #### **2. Governing Standards & Specifications** As an advanced engineering alloy, it is often covered by proprietary or emerging standards rather than generic international ones. * **Primary References:** * **Proprietary/Development Alloys:** Often designated as **SiMo (e.g., SiMo 4.0-1.0)** or under research codes like **RT-4 (Room Temperature - 4% Si)**. It is a subset of **Si-Enhanced Ductile Irons**. * **Industry & Research Standards:** * **ISO 1083 / EN 1563** for ductile iron provides a framework, but specific high-Si grades are often negotiated. * **ASTM A897/A897M (ADI)** may be referenced if the alloy is subsequently austempered. * **SAE J434** does not have a direct equivalent; these are typically custom-engineered materials. * **Key Testing Standards:** ASTM E8 (Tensile), E10 (Hardness), E21 (Elevated Temp Tensile), G54 (Oxidation Testing). --- #### **3. Typical Chemical Composition (Nominal 4% Si)** The hallmark is the high silicon content, with other elements tightly controlled. | Element | Target Range (wt.%) | Critical Role & Rationale | | :--- | :--- | :--- | | **Carbon (C)** | 2.8 - 3.4 | **Lowered** to compensate for high Si's graphitizing power and to prevent excessive carbon equivalent, which can lead to graphite flotation. | | **Silicon (Si)** | **3.8 - 4.2 (Nominal 4.0)** | **Primary Alloy.** Provides **solid solution strengthening** of ferrite, raises Ac1 transformation temperature, and dramatically improves oxidation resistance by forming a protective SiO₂ layer. | | **Manganese (Mn)** | **≤ 0.20** | **Very low.** Essential to prevent the formation of brittle Mn-Si-rich phases at cell boundaries, which would severely embrittle the alloy. | | **Molybdenum (Mo)** | **0 - 1.0** (Common: 0.5-1.0) | Frequently added to **improve elevated temperature strength and creep resistance** by solid solution and carbide strengthening. | | **Magnesium (Mg)** | 0.03 - 0.06 | Ensures full spheroidization of graphite in the high-Si matrix. | | **Cerium (Ce)/Rare Earths** | Often used | Aids in counteracting any minor interfering elements and refining the graphite structure. | | **Copper (Cu)** | ≤ 0.10 | Minimized, as it can promote pearlite and is not synergistic with the high-Si ferritic matrix goal. | | **Phosphorus (P)** | **≤ 0.03** | **Extremely low.** Critical due to high Si's tendency to promote severe phosphide segregation and embrittlement. | --- #### **4. Physical & Mechanical Properties** Properties are defined by the solid-solution-strengthened ferritic matrix. | Property | Typical Value (Room Temp, As-Cast/Ferritized) | Key Characteristics & Notes | | :--- | :--- | :--- | | **Tensile Strength** | **550 - 650 MPa (80 - 94 ksi)** | **~40-50% higher than standard 60-40-18 ferritic DI**, due to Si solid solution strengthening. | | **Yield Strength (0.2%)** | **400 - 500 MPa (58 - 73 ksi)** | **Significantly increased**, providing excellent resistance to deformation. | | **Elongation** | **10 - 18%** | **Retains good ductility** despite high strength, a key advantage over pearlitic grades. | | **Hardness (HBW)** | 200 - 250 HBW | Higher than standard ferritic grades, reflecting increased strength. | | **Modulus of Elasticity** | ~155 - 165 GPa | Slightly reduced compared to lower-Si DI due to lattice effects. | | **Charpy Impact (Room Temp)** | 8 - 15 J (V-Notch) | Impact toughness is moderate; the alloy is not designed for low-temperature impact service. | | **High-Temperature Performance** | **Excellent.** Maintains a higher percentage of its room-temperature strength and has **superior oxidation resistance** up to **800°C (1472°F)** compared to standard DI. | | **Thermal Conductivity** | **~30-35 W/m·K** | **Lower than standard DI (~36-42)** due to increased lattice scattering from high Si, but still acceptable for many thermal applications. | | **Coefficient of Thermal Expansion** | ~11.5 x 10⁻⁶ /K | Similar to standard ductile iron. | | **Microstructure** | **100% Ferritic Matrix** with fine, well-dispersed **Spheroidal Graphite**. Free of pearlite and carbides in properly processed material. | --- #### **5. Product Applications** This alloy is tailored for demanding applications where high temperature, wear, or a combination of strength and oxidation resistance are critical. * **Exhaust Systems & Turbocharging:** **Exhaust manifolds, turbocharger housings, and exhaust gas recirculation (EGR) components.** Its superior oxidation and thermal fatigue resistance are paramount. * **Industrial Furnace & Heat Treatment:** **Furnace fixtures, trays, chains, and radiant tubes** operating in oxidizing atmospheres up to 900°C. * **Engine & Power Generation:** **Cylinder heads for high-performance engines, piston crowns, and certain valve train components** subject to thermal cycling. * **Chemical & Process Industry:** **Components for reactors and piping** handling corrosive media at elevated temperatures, where Si content improves corrosion resistance. * **Alternative to More Expensive Alloys:** As a cost-effective replacement for **high-alloy austenitic ductile irons (e.g., D5S, Ni-Resist)** or some stainless steel castings in specific temperature ranges. --- #### **6. Fabrication & Processing Notes** * **Melting & Casting:** Requires careful control of charge materials and melting practice to achieve target Si without excessive oxidation. Fluidity is good, but shrinkage behavior differs from standard DI. * **Heat Treatment:** Typically used in the **as-cast or subcritically annealed** condition to ensure full ferritization. **It is generally NOT austenitized for quenching** due to its high Ac1 temperature and the risk of forming detrimental high-temperature phases. * **Machinability:** **Fair to Difficult.** The high hardness and abrasiveness of the solid solution-strengthened ferrite lead to higher tool wear than standard ferritic DI. Carbide tooling is recommended. * **Weldability:** **Very Poor.** The high Si content and specific microstructure make it highly susceptible to cracking. Welding is generally not recommended and requires extreme specialization if attempted. --- #### **7. Ordering Information** **Specify:** **"High Silicon Ductile Iron Castings, Nominal 4% Si Alloy (SiMo-type), As-Cast/Ferritized per [Proprietary Specification or Customer Drawing]."** **Critical Details to Provide:** * **Alloy Designation/Composition:** Specify target Si, Mo, and other key element ranges. * **Required Mechanical Properties** at room temperature and, if applicable, at elevated service temperatures. * **Application & Service Conditions** (max temperature, atmosphere). * **Certification Requirements:** Full chemical analysis and mechanical test reports. Microstructure validation (ferrite content, graphite shape) is crucial. * **Special Testing:** High-temperature tensile, oxidation resistance tests (e.g., ASTM G54), or thermal fatigue testing may be required for validation. **High Silicon (4% Si) Ductile Iron is a sophisticated engineering material that redefines the performance envelope of ferritic ductile iron, offering a compelling solution for high-temperature, high-strength applications where traditional materials fall short.** -:- For detailed product information, please contact sales. -: High Silicon Ductile Iron at RT 4Si nominal alloy content Specification Dimensions Size： Diameter 20-1000 mm Length <6543 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. -: High Silicon Ductile Iron at RT 4Si nominal alloy content Properties -:- For detailed product information, please contact sales. -:

Applications of High Silicon Ductile Iron Flange at RT 4Si nominal alloy content -:- For detailed product information, please contact sales. -: Chemical Identifiers High Silicon Ductile Iron Flange at RT 4Si nominal alloy content -:- For detailed product information, please contact sales. -:

Packing of High Silicon Ductile Iron Flange at RT 4Si nominal alloy content -:- 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 3014 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