High-Aluminum Iron Flange, heat-resistant gray 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. -: High-Aluminum Iron Flange, heat-resistant gray Iron Flange Product Information -:- For detailed product information, please contact sales. -: High-Aluminum Iron Flange, heat-resistant gray Iron Flange Synonyms -:- For detailed product information, please contact sales. -:

High-Aluminum Iron, heat-resistant gray iron Product Information -:- For detailed product information, please contact sales. -: ## **Product Introduction: High-Aluminum Heat-Resistant Gray Iron** High-Aluminum Heat-Resistant Gray Iron is a unique and highly specialized class of cast iron, differentiated by its exceptionally high aluminum content. This alloy is engineered to provide supreme oxidation and scaling resistance in extreme high-temperature environments, particularly under cyclic heating and cooling conditions where thermal shock is a primary concern. Its performance is fundamentally derived from the formation of a continuous, tenacious, and self-regenerating alumina (Al₂O₃) oxide layer on the surface, which acts as an outstanding barrier against oxygen penetration. This material excels in service temperatures ranging from **900°C to 1100°C (1650°F to 2010°F)**, offering a cost-effective alternative to some nickel-based superalloys in specific oxidizing atmospheres. While offering unmatched oxidation resistance for a cast iron, its high aluminum content introduces distinct challenges in casting and machining, making it a niche material for applications where its specific advantages are paramount. --- ### **1. Chemical Composition** The extraordinary heat resistance is primarily imparted by aluminum, which drastically alters the microstructure and surface behavior of the iron. **Typical Composition Ranges:** | Element | Standard Grade (Moderate Al) | High-Performance Grade (High Al) | Primary Function in Heat Resistance | | :--- | :--- | :--- | :--- | | **Aluminum (Al)** | **18.0 - 22.0%** | **22.0 - 28.0%** | **Core alloying element.** Forms a highly stable, continuous, and adherent **Al₂O₃ (alumina) surface scale** with extremely low oxygen diffusivity. This provides exceptional protection against oxidation, carburization, and sulfur attack. Dissolved Al also stabilizes a ferritic matrix. | | **Carbon (C)** | **1.50 - 2.20%** | **1.20 - 1.80%** | Exists primarily as fine graphite flakes or as complex carbides (e.g., κ-carbide, (Fe,Al)₃C). Lower carbon improves ductility and castability in high-Al grades. | | **Silicon (Si)** | 1.00 - 3.00% | 1.00 - 2.50% | Improves fluidity, enhances oxidation resistance synergistically with Al, and promotes ferrite stability. | | **Chromium (Cr)** | 0 - 2.0% (Optional) | 0 - 3.0% (Optional) | Sometimes added to further enhance scaling resistance and high-temperature strength. | | **Iron (Fe)** | Balance | Balance | Base metal. | **Microstructural Note:** The microstructure is characterized by an **aluminum-rich ferritic matrix** (α-Fe(Al) solid solution) containing a dispersion of **graphite and/or complex iron-aluminum carbides (κ-carbide)**. The high Al content suppresses pearlite formation entirely, ensuring a fully ferritic structure with excellent growth resistance but limited room-temperature strength. --- ### **2. Physical & Mechanical Properties at Room & Elevated Temperature** This material sacrifices some room-temperature properties for unparalleled high-temperature stability and surface protection. | Property | Typical Value / Description | | :--- | :--- | | **Microstructure** | Ferritic matrix (α-Fe(Al)) with fine graphite flakes and/or κ-carbide precipitates. | | **Density** | ~6.5 - 6.8 g/cm³ (Significantly lower than other cast irons due to light Al). | | **Tensile Strength (Room Temp)** | **150 - 250 MPa (22 - 36 ksi)** – Relatively low due to the soft ferritic matrix. | | **Compressive Strength** | Moderate. | | **Hardness (Room Temp)** | **180 - 250 HB** | | **Elongation** | **Very Low (<1%).** Remains brittle at room temperature. | | **Maximum Service Temperature** | **900°C - 1100°C (1650°F - 2010°F)** in oxidizing atmospheres. Performs well in cyclic service. | | **Oxidation/Scaling Resistance** | **Exceptional.** The Al₂O₃ scale is one of the most stable and protective oxides, offering oxidation resistance superior to high-chromium irons in pure oxidizing conditions. | | **Growth Resistance** | **Excellent.** The stable ferritic matrix and absence of phase transformations up to the melting point prevent growth. | | **Thermal Conductivity** | **Low (~20-25 W/m·K).** Lower than other gray irons, which can affect heat transfer but may reduce thermal stress gradients. | | **Thermal Shock Resistance** | **Very Good to Excellent.** The low modulus of elasticity, moderate strength, and stable microstructure provide good resistance to crack initiation from thermal cycling. | | **Abrasion/Wear Resistance at RT** | Poor to Fair. The soft ferritic matrix offers little wear resistance. | | **Machinability** | **Poor.** The material is gummy and abrasive, causing severe tool wear. Special tools and techniques are required. | --- ### **3. Key Product Advantages & Characteristics** * **Unrivaled Oxidation Resistance:** The alumina (Al₂O₃) scale provides arguably the best protection against high-temperature oxidation available in any cast iron system. * **Excellent Resistance to Thermal Cycling:** Low thermal expansion coefficient and stable structure yield superb resistance to thermal fatigue and spalling. * **Light Weight:** Significantly lower density than other heat-resistant alloys, beneficial for moving parts or where weight is a factor. * **Good Sulfidation Resistance:** Performs well in sulfur-containing atmospheres where nickel-based alloys may suffer. * **Cost-Effectiveness for High-Temp Oxidizing Service:** A lower-cost alternative to heat-resistant steels and nickel alloys in applications where its specific oxidation resistance is the primary requirement. --- ### **4. Product Applications** This material is used in specialized, high-temperature oxidizing environments where scaling is the primary failure mechanism. * **Heat Treatment Furnaces:** Components such as trays, pots, and fixtures for annealing, normalizing, and tempering, especially where clean, scale-free work is required. * **Ceramic & Powder Metallurgy:** Sintering trays, boats, and setters for firing ceramics and metal powders at high temperatures. * **Chemical Processing:** Components exposed to high-temperature oxidizing gases or molten salts. * **Glass Manufacturing:** Certain tools and handling equipment for molten glass. * **Energy Sector:** Parts for heat recuperators and air preheaters in high-temperature flue gas streams. --- ### **5. International Standards** High-Aluminum Iron is a highly specialized material and is not as uniformly standardized as other heat-resistant cast irons. It is often covered by proprietary specifications or national standards. | Standard / Basis | Title / Scope | Common Designations / Notes | | :--- | :--- | :--- | | **Proprietary Alloys** | Manufacturer-specific grades | Often designated as **Fe-Al alloys** or **Aluminum Iron** with specified Al content (e.g., Fe-24Al-2C). | | **GB/T 27748** | *Heat resistant austenitic cast iron* (Chinese) | While focused on austenitic, related standards or appendices may reference high-Al ferritic grades. Specific grades like **RQA** (Heat Resisting Aluminum Iron) may be defined in older or industry standards. | | **ASTM A297** | *Standard Specification for Heat-Resistant Iron-Chromium and Iron-Chromium-Nickel Alloy Castings* | While primarily for steels (HK, HP, etc.), the compositional philosophy for high-Al alloys is similar, though not explicitly listed. | | **JIS G5152** | *Heat-resistant ferritic alloy castings for high-temperature service* (Japanese) | May encompass high-Al cast irons under broad categories for ferritic heat-resistant materials. | | **Technical Literature** | Research papers & foundry catalogs | Often referred to as **High-Aluminum Cast Iron (HAI)** or **Al-Alloyed Gray Iron**. | **Specification Note:** Due to the lack of ubiquitous international standards, procurement is typically based on **detailed technical agreements between supplier and user**, specifying exact chemical composition ranges (especially Al, C, Si), required high-temperature performance tests (e.g., oxidation weight gain after 100 hours at 1000°C), and accepted casting quality standards. --- ### **Conclusion** High-Aluminum Heat-Resistant Gray Iron is a niche but powerful engineering material that leverages the unparalleled protective qualities of an **alumina (Al₂O₃) surface scale**. Its primary domain is in **severe, high-temperature oxidizing environments up to 1100°C**, where its resistance to scaling outperforms even high-chromium irons. The trade-offs—including **lower room-temperature strength, poor machinability, and challenging casting characteristics**—define its specialized application scope. For components like sintering trays and furnace fixtures where long-term oxidation resistance under cycling conditions is the sole critical criterion, it provides a uniquely effective and often cost-optimized solution. -:- For detailed product information, please contact sales. -: High-Aluminum Iron, heat-resistant gray iron Specification Dimensions Size： Diameter 20-1000 mm Length <6485 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-Aluminum Iron, heat-resistant gray iron Properties -:- For detailed product information, please contact sales. -:

Applications of High-Aluminum Iron Flange, heat-resistant gray Iron Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers High-Aluminum Iron Flange, heat-resistant gray Iron Flange -:- For detailed product information, please contact sales. -:

Packing of High-Aluminum Iron Flange, heat-resistant gray 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 2956 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