Cast Stainless Steel Sheet,Plate CF8C, ASTM A744

Cast Stainless Steel Sheet/Plate CF8C, ASTM A744 Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel Sheet/Plate CF8C, ASTM A744 Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel CF8C, ASTM A744 Product Information -:- For detailed product information, please contact sales. -: ### **Technical Datasheet: Cast Stainless Steel CF8C (ASTM A743)** #### **1. Product Overview** Cast Stainless Steel CF8C under ASTM A743 specification is a columbium-stabilized austenitic stainless steel designed to provide superior resistance to intergranular corrosion. This alloy represents the cast equivalent of wrought Type 347 stainless steel, offering enhanced performance in applications involving welding or high-temperature service where carbide precipitation could be a concern. The addition of columbium (niobium) effectively stabilizes the material against sensitization, making it particularly suitable for components that undergo welding or operate in the carbide precipitation temperature range. **Key Advantages:** - **Stabilized Composition:** Columbium addition prevents sensitization during welding and high-temperature exposure - **Excellent Intergranular Corrosion Resistance:** Superior performance in corrosive environments - **Good High-Temperature Strength:** Maintains mechanical properties at elevated temperatures - **Enhanced Weldability:** Suitable for fabricated structures requiring welding - **Versatile Application Range:** Performs well in both corrosive and high-temperature environments --- #### **2. International Standard** This product conforms to the latest edition of: - **ASTM A743/A743M:** Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, and Nickel-Base Corrosion-Resistant Alloys for General Application Additional applicable standards: - **UNS J92710:** Unified Numbering System designation - **ASME SA743:** ASME Boiler and Pressure Vessel Code equivalent - **ISO 11972:** Corrosion-resistant cast steels for general applications - **EN 10283:** Corrosion resistant steel castings --- #### **3. Chemical Composition (Heat Analysis, %)** The chemical composition includes controlled columbium content for effective stabilization. | 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) | 9.0-12.0 | | Columbium (Cb) [Niobium] | 8 × %C min, 1.00 max | *Note: The columbium content must be at least eight times the carbon content but not exceeding 1.00% to ensure effective stabilization.* --- #### **4. Mechanical Properties** Mechanical properties are guaranteed in the solution-annealed condition. **Minimum Required Values:** - **Tensile Strength:** 485 MPa (70 ksi) min - **Yield Strength (0.2% Offset):** 205 MPa (30 ksi) min - **Elongation in 2" (50 mm):** 35.0% min - **Reduction of Area:** 35.0% min **Typical Achievable Properties:** - **Tensile Strength:** 515-620 MPa (75-90 ksi) - **Yield Strength:** 240-310 MPa (35-45 ksi) - **Elongation:** 40-55% - **Hardness:** 140-170 HBW - **Impact Strength:** Excellent at cryogenic temperatures --- #### **5. Physical Properties (Typical Values)** - **Density:** 7.90 g/cm³ (0.285 lb/in³) - **Modulus of Elasticity:** 193 GPa (28,000 ksi) - **Poisson's Ratio:** 0.28 - **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:** 1 hour per inch of thickness, minimum 1 hour - **Cooling Method:** Rapid water quench or rapid air cool - **Objective:** To dissolve carbides and achieve homogeneous austenitic structure **Stabilization Heat Treatment (Optional):** - **Temperature:** 870-900°C (1600-1650°F) - **Purpose:** To precipitate columbium carbides preferentially --- #### **7. Corrosion Resistance** CF8C offers enhanced corrosion resistance characteristics: - **Intergranular Corrosion:** Excellent resistance due to columbium stabilization - **General Corrosion:** Good resistance to a wide range of corrosive media - **Oxidizing Environments:** Excellent resistance to nitric acid and other oxidizers - **Organic Acids:** Good performance in organic acid environments - **Chloride Environments:** Moderate resistance comparable to standard CF8 alloy - **High-Temperature Oxidation:** Good scaling resistance up to 870°C (1600°F) --- #### **8. Product Applications** CF8C cast stainless steel is specified for applications requiring stabilization against sensitization: **Chemical Processing Industry:** - Welded pressure vessels and reactors - Heat exchangers and condensers - Process piping systems requiring welding - Column internals and distributors **Power Generation:** - Pump casings and valve bodies - Steam system components - High-temperature piping accessories **Food and Pharmaceutical Industry:** - Processing equipment requiring frequent sanitization - Welded vessels and storage tanks - Sanitary piping systems **Other Applications:** - Pollution control equipment - Marine components - Architectural applications requiring welding --- #### **9. Fabrication & Welding Characteristics** **Casting Characteristics:** - Good castability with proper foundry practices - Pattern shrinkage: 20-25 mm/m - Low hot tearing tendency - Suitable for complex geometries **Machining:** - Good machinability in solution annealed condition - Work hardens during machining operations - Use positive rake tools and rigid setups - Recommended cutting speeds: 20-35 m/min (65-115 SFM) **Welding:** - **Weldability:** Excellent - **Preheating:** Generally not required - **Interpass Temperature:** Maintain below 150°C (300°F) - **Filler Metals:** E347 or ER347 stabilized grades - **Post-weld Heat Treatment:** Generally not required --- #### **10. Quality Assurance & Testing** - **Chemical Analysis:** Per ASTM A751 requirements - **Mechanical Testing:** Tensile tests per ASTM A370 - **Hardness Testing:** Multiple location verification - **Non-Destructive Testing:** - Radiographic examination per ASTM E94 - Liquid penetrant examination per ASTM E165 - **Corrosion Testing:** - Intergranular corrosion testing per ASTM A262 - Optional corrosion tests per customer 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 A743 is specifically designed for applications requiring stabilization against sensitization during welding or high-temperature service. The material's performance may vary based on specific service conditions, casting design, heat treatment parameters, and manufacturing processes. Always consult the complete ASTM A743 standard and work with qualified materials engineers for critical applications. Proper stabilization through adequate columbium content and appropriate heat treatment is essential for achieving optimal intergranular corrosion resistance. -:- For detailed product information, please contact sales. -: Cast Stainless Steel CF8C, ASTM A744 Specification Dimensions Size： Diameter 20-1000 mm Length <4188 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 A744 Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel Sheet,Plate CF8C, ASTM A744 -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel Sheet,Plate CF8C, ASTM A744 -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel Sheet/Plate CF8C, ASTM A744 -:- 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 Sheet/Plate 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 659 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