Cast Stainless Steel CF8, ASTM A744

Cast Stainless Steel CF8, ASTM A744 Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel CF8, ASTM A744 Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel CF8, ASTM A744 Product Information -:- For detailed product information, please contact sales. -: ### **Technical Datasheet: Cast Stainless Steel CF8 (ASTM A744)** #### **1. Product Overview** Cast Stainless Steel CF8 under ASTM A744 specification is an austenitic stainless steel casting alloy specifically designed for severe service conditions. As the cast equivalent of wrought 304 stainless steel, this chromium-nickel alloy offers reliable performance in demanding corrosive environments. The material is characterized by its excellent combination of corrosion resistance, mechanical properties, and fabrication characteristics, making it suitable for pressure-containing parts and critical components in aggressive service conditions. **Key Advantages:** - **Severe Service Capability:** Meets stringent requirements for demanding applications - **Good Corrosion Resistance:** Reliable performance in various corrosive environments - **Pressure-Containing Design:** Suitable for pressure vessel and valve applications - **Excellent Fabricability:** Good casting and welding characteristics - **Cost-Effective Solution:** Economical choice for many severe service applications --- #### **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 J92600:** 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) | 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 | | Iron (Fe) | Balance | *Note: The composition may include residual elements within specified limits to ensure consistent performance in severe service.* --- #### **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):** 35.0% min - **Reduction of Area:** 50.0% 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:** Good 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 when properly annealed --- #### **6. Heat Treatment** **Solution Annealing Treatment (Mandatory):** - **Temperature Range:** 1040-1120°C (1900-2050°F) - **Soak Time:** 1 hour per inch of thickness, minimum 1 hour - **Cooling Method:** Rapid water quench or rapid air cool - **Microstructure:** Homogeneous austenitic structure **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 applications --- #### **7. Corrosion Resistance** CF8 offers reliable corrosion resistance for severe service applications: - **General Corrosion:** Good resistance to a wide range of corrosive media - **Intergranular Corrosion:** Adequate resistance when properly heat treated - **Oxidizing Environments:** Good resistance to nitric acid and other oxidizers - **Organic Acids:** Good resistance to acetic, citric, and tartaric acids - **Atmospheric Conditions:** Excellent resistance to industrial atmospheres - **Fresh Water:** Very good resistance to potable water and steam --- #### **8. Product Applications** CF8 under ASTM A744 is specified for severe service applications across multiple industries: **Chemical Processing Industry:** - Pressure vessels and reactors - Heat exchangers and condensers - Process piping and valve bodies **Oil and Gas Applications:** - Wellhead components - Valve bodies and fittings - Process equipment **Power Generation:** - Pump casings and components - Valve bodies for utility service - Heat exchanger components **Other Severe Service Applications:** - Food and pharmaceutical processing equipment - Water treatment system components - Marine and offshore 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 pressure-containing parts **Machining:** - Good machinability in solution annealed condition - Work hardens rapidly during machining - 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:** E308 or ER308 - **Post-weld Heat Treatment:** Generally not required for most applications --- #### **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 - **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. CF8 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. Proper quality control and adherence to specified procedures are essential for ensuring optimal performance in severe service environments. -:- For detailed product information, please contact sales. -: Cast Stainless Steel CF8, ASTM A744 Specification Dimensions Size： Diameter 20-1000 mm Length <4185 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 CF8, ASTM A744 Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel CF8, ASTM A744 -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel CF8, ASTM A744 -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel CF8, 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 656 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