Cast Stainless Steel Capillary CF8C, ASTM A451

Cast Stainless Steel Capillary CF8C, ASTM A451 Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel Capillary 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 Capillary CF8C, ASTM A451 -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel Capillary CF8C, ASTM A451 -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel Capillary 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 Capillary 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