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

High-Nickel Iron, heat-resistant gray iron Product Information -:- For detailed product information, please contact sales. -: ## **Product Introduction: High-Nickel Heat-Resistant Gray Iron (Ni-Resist Heat-Resistant Grades)** High-Nickel Heat-Resistant Gray Iron, a specialized subgroup within the Ni-Resist family, is an austenitic cast iron engineered to provide exceptional long-term stability and oxidation resistance at elevated temperatures. Unlike standard high-nickel corrosion-resistant grades, these alloys are specifically optimized for service in high-temperature oxidizing, reducing, and thermal cycling environments, typically ranging from **650°C to 950°C (1200°F to 1740°F)**. The key to its performance lies in the stable austenitic matrix formed by high nickel content, which effectively eliminates harmful phase transformations upon heating and cooling, thus preventing growth and distortion while forming a tenacious, self-healing oxide layer. This material offers a unique combination of excellent high-temperature strength, resistance to thermal fatigue, good castability, and relative ease of machining, making it a preferred choice for complex, load-bearing components in severe thermal service. --- ### **1. Chemical Composition** Heat resistance is achieved by balancing nickel, chromium, and silicon to create a stable, oxidation-resistant austenitic structure. Carbon content is carefully controlled for strength and graphite formation. **Typical Composition of Key Heat-Resistant Grades:** | Element | Grade D-5S / Type 4 (High Temp) | Grade D-5S / Type 5 (High Temp, High Strength) | Primary Function in Heat Resistance | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | **13.5 - 17.5%** | **34.0 - 36.0%** | **Primary austenite stabilizer.** Prevents ferrite formation and the associated alpha-gamma phase change, eliminating growth. Provides fundamental strength and toughness at temperature. | | **Chromium (Cr)** | **1.75 - 2.50%** | **1.75 - 2.50%** | **Critical for oxidation resistance.** Forms a durable Cr₂O₃-rich surface scale, protecting against scaling and carburization. Increases elevated temperature strength. | | **Silicon (Si)** | **5.00 - 6.00%** | **5.00 - 6.00%** | **Synergistic oxidant.** Promotes formation of a dense, adherent SiO₂-Cr₂O₃ complex scale. Significantly increases scaling temperature and growth resistance. | | **Carbon (C)** | **2.40 - 3.00%** | **1.60 - 2.40%** | Provides graphite for thermal shock resistance and machinability. Lower carbon in high-Ni grades increases alloy stability and strength. | | **Manganese (Mn)** | 0.40 - 1.00% | 0.40 - 1.00% | Counteracts sulfur and provides solid solution strengthening. | | **Copper (Cu)** | ≤ 0.50% | ≤ 0.50% | May be present in some grades for added corrosion resistance. | | **Iron (Fe)** | Balance | Balance | Base metal. | **Microstructural Note:** The target microstructure is a **fully austenitic matrix** with a uniform distribution of **Type A flake graphite**. No pearlite or ferrite should be present in the heat-treated condition, ensuring dimensional stability. --- ### **2. Physical & Mechanical Properties at Room & Elevated Temperature** Properties are defined by remarkable retention of strength and resistance to degradation under thermal exposure. | Property | Typical Value / Description | | :--- | :--- | | **Microstructure** | **Austenitic matrix with flake graphite** (critical for growth resistance). | | **Density** | ~7.1 - 7.3 g/cm³ | | **Tensile Strength (Room Temp)** | **170 - 310 MPa (25 - 45 ksi)** – Varies by grade; higher Ni grades offer greater strength. | | **Yield Strength (0.2% Offset)** | **140 - 260 MPa (20 - 38 ksi)** | | **Elongation** | 1 - 3% | | **Hardness (Room Temp)** | **140 - 210 HB** | | **Maximum Service Temperature** | **Type 4: Up to 815°C (1500°F)**
**Type 5: Up to 950°C (1740°F)** in continuous oxidizing service. | | **Growth Resistance** | **Outstanding.** Exhibits minimal permanent growth (<0.1% after 1000h at 870°C) due to the stable austenite. | | **Oxidation/Scaling Resistance** | **Excellent.** The Si-Cr-Ni alloying promotes a highly protective, adherent, and slow-growing oxide scale. | | **Thermal Conductivity** | Moderate (~12-15 W/m·K). Lower than low-alloy gray iron, but sufficient for many applications. | | **Thermal Shock Resistance** | **Very Good to Excellent.** The austenitic matrix is ductile, and graphite flakes help arrest crack propagation. | | **Creep & Rupture Strength** | Good. Superior to other gray irons at temperatures above 650°C. | | **Machinability** | Good (similar to standard gray iron of equivalent hardness). | --- ### **3. Key Product Advantages & Characteristics** * **Exceptional Growth Resistance:** The invariant austenitic structure is the most stable of all cast irons upon thermal cycling, ensuring dimensional integrity. * **Superior Oxidation & Scaling Resistance:** The combined effect of Ni, Cr, and Si creates a formidable barrier against high-temperature gas corrosion. * **Retained Ductility & Toughness at Temperature:** Maintains better fracture resistance under thermal stress compared to ferritic heat-resistant irons. * **Good Castability and Machinability:** Allows for the production of complex, thin-walled castings that can be readily machined. * **Non-Magnetic:** A valuable characteristic for specific furnace and electrical applications. --- ### **4. Product Applications** This material is specified for complex, high-integrity components subjected to severe and cyclic thermal stresses. * **Heat Treatment & Industrial Furnaces:** Retorts, carburizing boxes, furnace trays, fan blades, radiant tubes, muffles, chain links for conveyor belts. * **Power Generation:** Turbocharger housings for large diesel engines, exhaust manifolds, heat exchanger parts. * **Chemical & Petrochemical:** Reformers, pyrolysis tubes, fittings, and supports in high-temperature process streams. * **Glass Manufacturing:** Mold blocks, plungers, and handling tools for molten glass. * **Engine & Exhaust Systems:** High-performance exhaust manifolds and turbo housings requiring resistance to thermal fatigue. --- ### **5. International Standards** These alloys are covered under standards for austenitic cast irons, with specific grades designated for high-temperature service. | Standard | Title / Scope | Common Designations / Notes | | :--- | :--- | :--- | | **ASTM A436** | *Standard Specification for Austenitic Gray Iron Castings* | **Type 4 (D-5S)** and **Type 5 (D-5S)** are the primary high-temperature, high-silicon grades. This is the key ASTM standard. | | **ISO 2892** | *Austenitic cast irons* | **JLW/HR/ANi20Si5Cr2** (Example: designates a Ni-Resist with ~20% Ni, 5% Si, 2% Cr for heat resistance). | | **EN 13835** | *Founding - Austenitic cast irons* (European) | **EN-GJLA-XNiSiCr20-5-2** (Material Number). This systematic designation clearly shows the Ni-Si-Cr content for heat-resistant types. | | **JIS G5510** | *Austenitic cast irons* (Japanese) | **FCA-Ni20Cr2Si5** or similar notations indicating high silicon. | | **GB/T 27748** | *Heat resistant austenitic cast iron* (Chinese) | **NTK Si5** series, which specifically standardizes high-nickel, high-silicon heat-resistant grades. | **Specification Note:** When ordering, it is critical to specify the **standard and the type/grade (e.g., ASTM A436 Type 5)** to ensure the correct high-temperature chemistry (particularly the high Si content) is supplied, as opposed to standard Ni-Resist corrosion grades. --- ### **Conclusion** High-Nickel Heat-Resistant Gray Iron (Ni-Resist HT) is the premier choice for demanding applications where **dimensional stability under thermal cycling is as critical as oxidation resistance**. Its **stable austenitic matrix, fortified by high silicon and chromium**, provides an unmatched defense against growth, scaling, and thermal fatigue. While representing a higher initial cost than medium-silicon or high-chromium irons, its reliability and longevity in complex, high-stress thermal components—such as furnace retorts and turbocharger housings—make it a cost-effective engineering solution for extreme service conditions. It stands as a testament to the capability of alloyed cast iron to perform in environments approaching those reserved for exotic alloys. -:- For detailed product information, please contact sales. -: High-Nickel Iron, heat-resistant gray iron Specification Dimensions Size： Diameter 20-1000 mm Length <6483 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-Nickel Iron, heat-resistant gray iron Properties -:- For detailed product information, please contact sales. -:

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

Packing of High-Nickel 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 2954 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