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

High-Chromium Iron, heat-resistant gray iron Product Information -:- For detailed product information, please contact sales. -: ## **Product Introduction: High-Chromium Heat-Resistant Gray Iron** High-Chromium Heat-Resistant Gray Iron is a premium, alloyed cast iron engineered to withstand severe thermal environments, offering exceptional performance at service temperatures **exceeding 850°C (1560°F) and up to 1150°C (2100°F)**. Its defining characteristic is a high chromium content, which fundamentally transforms its microstructure and surface chemistry. Chromium promotes the formation of a stable, iron-chromium carbides (e.g., (Fe,Cr)₇C₃, (Fe,Cr)₂₃C₆) and, most critically, enables the development of a dense, tightly adherent chromium oxide (Cr₂O₃) scale on the surface. This scale acts as a highly effective barrier against oxidation, carburization, and sulfur attack, making this material the cast iron of choice for the most demanding high-temperature applications. This alloy represents the pinnacle of heat resistance within the gray iron family, bridging the gap between lower-alloy irons and fully austenitic stainless steels or nickel-based alloys. --- ### **1. Chemical Composition** Heat and corrosion resistance at extreme temperatures are achieved through high chromium content, often supplemented with silicon and nickel. The composition is tightly controlled to balance hardness, castability, and thermal stability. **Typical Composition Ranges for Common Grades:** | Element | Standard Grade | High-Performance Grade | Primary Function in Heat Resistance | | :--- | :--- | :--- | :--- | | **Chromium (Cr)** | **15.0 - 20.0%** | **25.0 - 35.0%** | **Core alloying element.** Forms protective **Cr₂O₃ scale**; creates hard, thermally stable chromium carbides; raises the A₁ transformation temperature; provides excellent resistance to oxidation, sulfidation, and carburization. | | **Carbon (C)** | 1.50 - 2.20% | 1.20 - 2.00% | Combines with Cr to form stable carbides, providing high-temperature strength and wear resistance. Lower C improves ductility and weldability. | | **Silicon (Si)** | 1.00 - 3.00% | 1.50 - 3.00% | Synergizes with Cr to improve oxidation resistance, stabilizes ferrite, and improves fluidity. | | **Nickel (Ni)** | 0 - 2.0% | 0 - 15.0% | Added in some grades to improve toughness, thermal shock resistance, and to stabilize austenite in the highest-temperature grades. | | **Manganese (Mn)** | 0.30 - 1.00% | 0.30 - 1.00% | General deoxidizer and mild solid solution strengthener. | | **Molybdenum (Mo)** | 0 - 1.5% | 0 - 2.0% | Enhances high-temperature strength and creep resistance. | | **Iron (Fe)** | Balance | Balance | Base metal. | **Microstructural Note:** The microstructure is complex, typically consisting of a **martensitic, ferritic, or austenitic matrix** (depending on Cr/Ni ratio) with a network of **primary and eutectic chromium carbides**, and graphite flakes. The high carbide content makes it inherently hard and abrasion-resistant. --- ### **2. Physical & Mechanical Properties at Room & Elevated Temperature** These materials are optimized for hot service, often at the expense of room-temperature machinability and ductility. | Property | Typical Value / Description | | :--- | :--- | | **Microstructure** | Carbide-rich matrix (martensitic/ferritic) with graphite flakes and complex chromium carbides (M₇C₃, M₂₃C₆). | | **Density** | ~7.2 - 7.5 g/cm³ | | **Tensile Strength (Room Temp)** | **300 - 550 MPa (44 - 80 ksi)** – Can be significantly higher than standard gray irons due to carbide strengthening. | | **Compressive Strength** | **Very High** – Excellent for load-bearing applications at temperature. | | **Hardness (Room Temp)** | **300 - 600 HB** – Very hard and wear-resistant, but challenging to machine. | | **Elongation** | **Negligible (<0.5%)** – Brittle at room temperature. | | **Maximum Service Temperature** | **900°C - 1150°C (1650°F - 2100°F)**, depending on Cr content and atmosphere. Continuously oxidizing: up to 1150°C. Cyclic conditions: lower. | | **Oxidation/Scaling Resistance** | **Outstanding.** The Cr₂O₃ scale is highly protective in oxidizing, carburizing, and sulfur-containing atmospheres. | | **Growth Resistance** | **Excellent.** The stable carbides and high A₁ temperature prevent pearlite-related growth. | | **Thermal Conductivity** | Moderate to Low – Lower than standard gray iron due to alloying. | | **Thermal Shock Resistance** | **Fair to Good.** High strength helps, but lower conductivity and brittleness can be limiting. Nickel additions improve this property. | | **Abrasion/Wear Resistance** | **Exceptional** at all temperatures, due to the hard chromium carbides. | --- ### **3. Key Product Advantages & Characteristics** * **Unmatched Heat & Oxidation Resistance:** Capable of continuous service in air where most other cast irons fail. Resists scaling, growth, and deformation. * **Excellent Environmental Resistance:** Superior performance in carburizing, sulfidizing, and chlorine-containing atmospheres compared to nickel-based alloys in certain ranges. * **Outstanding Abrasion & Wear Resistance:** The high volume of hard carbides provides exceptional resistance to mechanical wear, even at high temperatures. * **High Hot Strength & Creep Resistance:** Maintains load-bearing capability under stress at extreme temperatures. * **Cost-Effective for Specific Duties:** Often more economical than heat-resistant steels or superalloys for applications where its unique combination of wear and heat resistance is required. --- ### **4. Product Applications** This material is specified for the most severe high-temperature service where oxidation, wear, and stability are paramount. * **Furnace & Heat Treatment:** Radiant tubes, burner nozzles, recuperator tubes, furnace trays, skid rails, rolls for reheating furnaces. * **Cement, Lime & Ceramics Industry:** Kiln burners, cooler grates, cyclone liners, nozzle blocks, sintering pallets. * **Power Generation & Waste Incineration:** Grate bars for waste-to-energy plants, ash conveyor parts, boiler components exposed to high erosion/corrosion. * **Chemical & Petrochemical:** Reformers, pyrolysis tubes, and fixtures for high-temperature chemical processes. * **Glass Manufacturing:** Molds, plungers, and orifice rings for handling molten glass. --- ### **5. International Standards** High-chromium heat-resistant cast irons are covered by specialized standards focused on their high-temperature performance. | Standard | Title / Scope | Common Designations / Notes | | :--- | :--- | :--- | | **ASTM A532/A532M** | *Standard Specification for Abrasion-Resistant Cast Irons* | **Class III Type A (15% Cr, 3% Mo)** and other high-Cr white irons. While focused on abrasion, these are often used for combined heat/wear service. | | **JIS G5151** | *Heat resistant castings for high-temperature service* (Japanese) | **SCH 1, SCH 2, SCH 3, etc.** SCH grades (e.g., SCH 13: ~30% Cr) specifically denote high-Cr heat-resistant cast steels and irons. | | **DIN EN 10295** | *Heat-resistant cast steels and cast alloys* (European) | **G-X 40CrSi 27, G-X 300CrMo 15 3** – Material numbers define specific high-Cr, heat-resistant compositions. | | **GB/T 8492** | *Heat resistant cast steels and alloys* (Chinese) | **RTCr16, RTCr20, RTCr28** – The "RT" series explicitly defines high-chromium heat-resistant cast irons. | | **ISO 11973** | *Heat-resistant castings for general applications* | Provides general guidelines and classification for heat-resistant castings, including high-chromium types. | **Specification Note:** Due to the specialized nature of these alloys, procurement typically requires specifying a **detailed chemical composition** and the relevant **performance standards (e.g., oxidation resistance at 1000°C for 500 hours)**. The distinction between "high-chromium cast iron" and "heat-resistant cast steel" can blur at higher chromium levels. --- ### **Conclusion** High-Chromium Heat-Resistant Gray Iron is a specialized, high-performance material designed for survival in extreme thermal and abrasive environments. Its efficacy is derived from a **chromium-rich, carbide-strengthened microstructure** and the formation of a **self-regenerating chromium oxide protective scale**. While characterized by high hardness and limited room-temperature ductility, its value is unparalleled in applications demanding **long-term stability under load at temperatures above 900°C**, particularly where oxidation, carburization, or wear are concurrent challenges. It remains an essential engineering material for aggressive industrial thermal processes. -:- For detailed product information, please contact sales. -: High-Chromium Iron, heat-resistant gray iron Specification Dimensions Size： Diameter 20-1000 mm Length <6482 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-Chromium Iron, heat-resistant gray iron Properties -:- For detailed product information, please contact sales. -:

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

Packing of High-Chromium 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 2953 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