Cast Stainless Steel CF8M, ASTM A744

Cast Stainless Steel CF8M, ASTM A744 Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel CF8M, ASTM A744 Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel CF8M, ASTM A744 Product Information -:- For detailed product information, please contact sales. -: ### **Technical Datasheet: Cast Stainless Steel CF8M (ASTM A744)** #### **1. Product Overview** Cast Stainless Steel CF8M under ASTM A744 specification is an austenitic stainless steel casting alloy specifically designed for severe corrosive service conditions. As the cast equivalent of wrought 316 stainless steel, this chromium-nickel-molybdenum alloy offers superior corrosion resistance, particularly in chloride-containing environments. The "M" designation indicates the presence of 2-3% molybdenum, which significantly enhances pitting and crevice corrosion resistance, making it an optimal choice for demanding applications where conventional stainless steels may fail. **Key Advantages:** - **Exceptional Corrosion Resistance:** Superior performance in severe corrosive environments, including chloride-containing media - **Enhanced Pitting Resistance:** Molybdenum addition significantly improves resistance to pitting corrosion - **Excellent Crevice Corrosion Resistance:** Superior performance in stagnant and crevice conditions - **Severe Service Capability:** Meets stringent requirements for demanding applications - **Good Mechanical Properties:** Balanced combination of strength, ductility, and toughness --- #### **2. International Standard** This product conforms to the latest edition of: - **ASTM A744/A744M:** Standard Specification for Castings, Iron-Chromium-Nickel, Iron-Chromium-Nickel-Molybdenum, Corrosion Resistant, for Severe Service Additional applicable standards: - **UNS J92900:** Unified Numbering System designation - **ASME SA744:** 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 is precisely controlled to ensure optimal performance in severe service conditions. | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.08 max | | Manganese (Mn) | 1.50 max | | Silicon (Si) | 1.50 max | | Phosphorus (P), max | 0.04 | | Sulfur (S), max | 0.04 | | Chromium (Cr) | 18.0-21.0 | | Nickel (Ni) | 9.0-12.0 | | Molybdenum (Mo) | 2.0-3.0 | | Iron (Fe) | Balance | *Note: The molybdenum content is critical for enhanced pitting and crevice corrosion resistance in chloride environments encountered in severe service applications.* --- #### **4. Mechanical Properties** Mechanical properties meet the stringent requirements of ASTM A744 for severe service applications. **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):** 30.0% min - **Reduction of Area:** 40.0% min **Typical Achievable Properties:** - **Tensile Strength:** 515-655 MPa (75-95 ksi) - **Yield Strength:** 240-345 MPa (35-50 ksi) - **Elongation:** 35-50% - **Hardness:** 150-180 HBW - **Impact Strength:** Excellent at cryogenic temperatures down to -196°C (-321°F) --- #### **5. Physical Properties (Typical Values)** - **Density:** 7.98 g/cm³ (0.288 lb/in³) - **Modulus of Elasticity:** 193 GPa (28,000 ksi) - **Poisson's Ratio:** 0.28 - **Thermal Conductivity:** 16.3 W/m·K (at 100°C) - **Specific Heat Capacity:** 500 J/kg·K (at 0-100°C) - **Coefficient of Thermal Expansion:** 16.0 × 10⁻⁶/°C (20-100°C) - **Electrical Resistivity:** 0.74 μΩ·m - **Magnetic Permeability:** Essentially non-magnetic --- #### **6. Heat Treatment** **Solution Annealing Treatment (Mandatory):** - **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 achieve homogeneous austenitic structure and optimal corrosion resistance for severe service **Critical Processing Requirements:** - Rapid cooling through 425-815°C (800-1500°F) range is essential - Prevents chromium carbide precipitation at grain boundaries - Ensures maximum corrosion resistance for severe service conditions --- #### **7. Corrosion Resistance** CF8M offers exceptional corrosion resistance for severe service applications: - **Pitting Corrosion:** Excellent resistance due to molybdenum content (PREN ~24-26) - **Crevice Corrosion:** Superior performance in stagnant and crevice conditions - **Chloride Stress Corrosion Cracking:** Good resistance in moderate chloride environments - **General Corrosion:** Excellent resistance to a wide range of corrosive media - **Intergranular Corrosion:** Good resistance when properly heat treated - **Acid Resistance:** Good performance in sulfuric, phosphoric, and organic acids --- #### **8. Product Applications** CF8M under ASTM A744 is specified for severe service applications across multiple industries: **Chemical Processing Industry:** - Reactors and pressure vessels for corrosive chemical service - Heat exchangers and condensers in chloride environments - Process piping systems handling aggressive chemicals **Oil and Gas Industry:** - Wellhead components and Christmas tree parts - Valve bodies and fittings for corrosive service - Process equipment in offshore and onshore facilities **Marine and Offshore Applications:** - Seawater handling systems and components - Pump casings and impellers for marine service - Offshore platform equipment and components **Power Generation:** - FGD system components - Cooling water system parts - Pump components for utility service **Other Severe Service Applications:** - Pharmaceutical processing equipment - Pollution control equipment - Water treatment system components --- #### **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 and severe service components **Machining:** - Good machinability in solution annealed condition - Work hardens rapidly 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:** E316L or ER316L - **Post-weld Heat Treatment:** Generally not required --- #### **10. Quality Assurance & Testing** - **Chemical Analysis:** Comprehensive analysis per ASTM A751 - **Mechanical Testing:** Full suite of tests per ASTM A370 - **Hardness Testing:** Multiple location verification - **Non-Destructive Examination:** - Radiographic testing per ASTM E94/E1032 - Liquid penetrant testing per ASTM E165/E1417 - Additional NDT as required by specification - **Corrosion Testing:** Optional per customer requirements for severe service verification - **Certification:** Full traceability with comprehensive test reports - **Heat Treatment Documentation:** Complete thermal cycle records --- **Disclaimer:** This technical datasheet provides general information for reference purposes only. CF8M stainless steel under ASTM A744 is designed for severe service applications and requires strict adherence to specified chemical composition, heat treatment, and quality assurance procedures. The material's performance may vary based on specific service conditions, casting design, and manufacturing processes. Always consult the complete ASTM A744 standard and work with qualified materials engineers for critical applications in severe service environments. Proper material selection, design, fabrication, and quality control are essential for ensuring reliable performance in demanding corrosive applications. -:- For detailed product information, please contact sales. -: Cast Stainless Steel CF8M, ASTM A744 Specification Dimensions Size： Diameter 20-1000 mm Length <4191 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 CF8M, ASTM A744 Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel CF8M, ASTM A744 -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel CF8M, ASTM A744 -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel CF8M, 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 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 662 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