Cast Stainless Steel Flange CF8C, ASTM A451

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. -: Cast Stainless Steel Flange CF8C, ASTM A451 Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel Flange CF8C, ASTM A451 Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel CF8C, ASTM A451 Product Information -:- For detailed product information, please contact sales. -: ### **Technical Datasheet: Cast Stainless Steel CF8C (ASTM A451)** #### **1. Product Overview** Cast Stainless Steel CF8C under ASTM A451 specification is a stabilized austenitic stainless steel specifically designed for high-temperature service applications. This chromium-nickel alloy contains columbium (niobium) stabilization, which provides enhanced resistance to intergranular corrosion and improved high-temperature strength properties. As a centrifugally cast product, CF8C offers superior mechanical properties and microstructural uniformity, making it particularly suitable for pressure-containing parts in elevated temperature service. **Key Advantages:** - **Stabilized Composition:** Columbium addition prevents sensitization and intergranular corrosion - **High-Temperature Strength:** Excellent creep and rupture properties at elevated temperatures - **Superior Microstructure:** Centrifugal casting provides dense, uniform grain structure - **Good Oxidation Resistance:** Suitable for continuous high-temperature service - **Pressure-Containing Capability:** Meets stringent requirements for high-temperature pressure applications --- #### **2. International Standard** This product conforms to the latest edition of: - **ASTM A451/A451M:** Standard Specification for Centrifugally Cast Austenitic Steel Pipe for High-Temperature Service Additional applicable standards: - **UNS J92710:** Unified Numbering System designation - **ASME SA451:** ASME Boiler and Pressure Vessel Code equivalent - **ASTM A608:** Additional specification for high-temperature centrifugally cast alloys - **ISO 11972:** Corrosion-resistant cast steels for general applications --- #### **3. Chemical Composition (Heat Analysis, %)** The chemical composition is carefully balanced with stabilization elements for high-temperature performance. | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.08 max | | Manganese (Mn) | 1.50 max | | Silicon (Si) | 2.00 max | | Phosphorus (P), max | 0.04 | | Sulfur (S), max | 0.04 | | Chromium (Cr) | 18.0-21.0 | | Nickel (Ni) | 8.0-11.0 | | Columbium (Cb) [Niobium] | 8 × %C min, 1.00 max | *Note: The columbium content must be at least 8 times the carbon content but not exceeding 1.00%.* --- #### **4. Mechanical Properties** Mechanical properties are determined in the heat-treated condition as specified in ASTM A451. **Minimum Required Values (Solution Annealed Condition):** - **Tensile Strength:** 485 MPa (70 ksi) min - **Yield Strength (0.2% Offset):** 205 MPa (30 ksi) min - **Elongation in 2" (50 mm):** 35% min **Elevated Temperature Properties (Typical):** - **Creep Strength:** Excellent at temperatures up to 815°C (1500°F) - **Rupture Strength:** Maintains good properties under prolonged stress at high temperatures - **Stress Rupture:** Meets ASME Section I requirements for power boiler applications --- #### **5. Physical Properties (Typical Values)** - **Density:** 7.90 g/cm³ (0.285 lb/in³) - **Modulus of Elasticity:** 193 GPa (28,000 ksi) at 21°C (70°F) - **Thermal Conductivity:** 16.2 W/m·K (at 100°C) - **Specific Heat Capacity:** 500 J/kg·K (at 0-100°C) - **Coefficient of Thermal Expansion:** 16.5 × 10⁻⁶/°C (20-100°C) - **Electrical Resistivity:** 0.72 μΩ·m - **Magnetic Permeability:** Essentially non-magnetic --- #### **6. Heat Treatment** **Solution Annealing Treatment:** - **Temperature Range:** 1040-1150°C (1900-2100°F) - **Soak Time:** Appropriate time for wall thickness, minimum 1 hour - **Cooling Method:** Rapid cool by quenching in water or rapid air cooling - **Objective:** To dissolve carbides and achieve homogeneous austenitic structure with columbium in solution **Stabilization Annealing (Optional):** - **Temperature:** 870-925°C (1600-1700°F) - **Purpose:** To precipitate columbium carbides and enhance stabilization --- #### **7. High-Temperature Performance** CF8C offers excellent performance in high-temperature applications: - **Oxidation Resistance:** Good resistance to scaling up to 870°C (1600°F) - **Creep Resistance:** Maintains strength under prolonged stress at high temperatures - **Thermal Fatigue Resistance:** Good resistance to thermal cycling - **Microstructural Stability:** Columbium stabilization prevents sensitization during high-temperature service - **Carbide Precipitation:** Controlled precipitation of columbium carbides enhances high-temperature properties --- #### **8. Product Applications** CF8C centrifugally cast stainless steel is primarily used in high-temperature pressure applications: **Power Generation Industry:** - Superheater and reheater tubes - Steam headers and piping systems - High-temperature pressure vessels - Turbine casing components **Petrochemical Industry:** - Reform furnace tubes - Heater tubes and coils - Catalytic reactor components - High-temperature process piping **Other High-Temperature Applications:** - Heat treatment furnace components - High-temperature heat exchangers - Process industry high-temperature equipment - Nuclear power plant components --- #### **9. Fabrication & Welding Characteristics** **Casting Characteristics:** - Specifically designed for centrifugal casting process - Excellent fluidity and casting characteristics - Produces dense, homogeneous wall structure - Suitable for large diameter pipe and tubular components **Machining:** - Good machinability in solution annealed condition - Work hardens during machining operations - Use positive rake tools and adequate cooling - Recommended cutting speeds: 20-35 m/min (65-115 SFM) **Welding:** - **Weldability:** Good with proper procedures - **Filler Metals:** E347 or ER347 stabilized grades - **Preheating:** Generally not required - **Post-weld Heat Treatment:** Solution annealing recommended for optimal corrosion resistance --- #### **10. Quality Assurance & Testing** - **Chemical Analysis:** Per ASTM A751 requirements - **Mechanical Testing:** Tensile tests per ASTM A370 - **Hardness Testing:** Multiple location verification - **Non-Destructive Examination:** - Radiographic examination per ASTM E94 - Liquid penetrant examination per ASTM E165 - Ultrasonic examination for wall thickness verification - **High-Temperature Testing:** Creep and rupture testing available - **Hydrostatic Testing:** Required per specification requirements - **Certification:** Full traceability with comprehensive mill test certificates --- **Disclaimer:** This technical datasheet provides general information for reference purposes only. CF8C stainless steel under ASTM A451 is specifically designed for centrifugally cast high-temperature applications and requires strict control of chemical composition, heat treatment, and manufacturing processes. The material's performance may vary based on specific service conditions, casting parameters, and operating environments. Always consult the complete ASTM A451 standard and work with qualified materials engineers for critical high-temperature applications. Proper design considerations for thermal expansion, creep, and high-temperature corrosion are essential for successful performance in elevated temperature service. -:- For detailed product information, please contact sales. -: Cast Stainless Steel CF8C, ASTM A451 Specification Dimensions Size： Diameter 20-1000 mm Length <4186 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. -: Cast Stainless Steel CF8C, ASTM A451 Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel Flange CF8C, ASTM A451 -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel Flange CF8C, ASTM A451 -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel Flange CF8C, ASTM A451 -:- 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 657 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