Cast Stainless Steel Seamless tube CF3MN, ASTM A744

Cast Stainless Steel Seamless tube CF3MN, ASTM A744 Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel Seamless tube CF3MN, ASTM A744 Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel CF3MN, ASTM A744 Product Information -:- For detailed product information, please contact sales. -: ### **Technical Datasheet: Cast Stainless Steel CF3MN (ASTM A744)** #### **1. Product Overview** Cast Stainless Steel CF3MN under ASTM A744 specification is an austenitic stainless steel casting alloy with nitrogen addition, representing the cast equivalent of wrought 316LN stainless steel. This low-carbon chromium-nickel-molybdenum alloy with controlled nitrogen content offers enhanced strength and superior corrosion resistance compared to standard CF3 alloy. The "MN" designation indicates the presence of Molybdenum and Nitrogen, which significantly improve pitting and crevice corrosion resistance, making it particularly suitable for severe service conditions in chloride-containing environments. **Key Advantages:** - **Enhanced Corrosion Resistance:** Superior performance in chloride-containing environments - **Higher Strength:** Nitrogen strengthening provides improved mechanical properties - **Excellent Pitting Resistance:** Molybdenum and nitrogen synergistically enhance pitting resistance - **Good Weldability:** Low carbon content prevents sensitization during welding - **Cryogenic Toughness:** Maintains excellent impact properties at low temperatures --- #### **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 J92800:** Unified Numbering System designation - **ASME SA744:** ASME Boiler and Pressure Vessel Code equivalent - **ISO 11972:** Corrosion-resistant cast steels for general applications --- #### **3. Chemical Composition (Heat Analysis, %)** The chemical composition is precisely controlled to optimize corrosion resistance and mechanical properties. | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.03 max | | Manganese (Mn) | 1.50 max | | Silicon (Si) | 1.50 max | | Phosphorus (P), max | 0.04 | | Sulfur (S), max | 0.04 | | Chromium (Cr) | 17.0-21.0 | | Nickel (Ni) | 9.0-13.0 | | Molybdenum (Mo) | 2.0-3.0 | | Nitrogen (N) | 0.10-0.20 | *Note: Nitrogen content is controlled to enhance strength and pitting corrosion resistance.* --- #### **4. Mechanical Properties** Mechanical properties meet ASTM A744 requirements 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% min - **Reduction of Area:** 50% min **Typical Achievable Properties:** - **Tensile Strength:** 515-655 MPa (75-95 ksi) - **Yield Strength:** 240-345 MPa (35-50 ksi) - **Elongation:** 40-55% - **Hardness:** 150-180 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:** 0.74 μΩ·m - **Magnetic Permeability:** Essentially non-magnetic --- #### **6. Heat Treatment** **Solution Annealing Treatment:** - **Temperature:** 1040-1120°C (1900-2050°F) - **Soak Time:** 1 hour per inch of thickness, minimum 1 hour - **Cooling:** Rapid water quench or rapid air cool - **Objective:** To dissolve carbides and achieve homogeneous austenitic structure **Critical Processing Parameters:** - Rapid cooling through 425-815°C (800-1500°F) range is essential - Prevents chromium carbide precipitation - Ensures optimal corrosion resistance properties --- #### **7. Corrosion Resistance** CF3MN offers exceptional corrosion resistance for severe service applications: - **Pitting Corrosion:** Excellent resistance due to molybdenum and nitrogen content (PREN > 26) - **Crevice Corrosion:** Superior performance in stagnant conditions - **Chloride Stress Corrosion Cracking:** Good resistance in moderate chloride environments - **General Corrosion:** Excellent resistance to a wide range of corrosive media - **Intergranular Corrosion:** Maximum resistance due to low carbon content - **Acid Resistance:** Good performance in sulfuric and phosphoric acids --- #### **8. Product Applications** CF3MN under ASTM A744 is specified for severe service applications requiring enhanced corrosion resistance: **Chemical Processing Industry:** - Reactors and pressure vessels for corrosive chemical service - Heat exchangers and condensers in chloride environments - Piping systems handling aggressive chemicals **Marine and Offshore:** - Seawater handling systems - Pump components and valve bodies - Offshore platform equipment **Oil and Gas:** - Downhole tools and components - Process piping in corrosive service - Wellhead components **Other Applications:** - Pharmaceutical processing equipment - Food processing in corrosive environments - Pollution control equipment --- #### **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 rapidly during machining - Use positive rake tools and rigid setups - Recommended cutting speeds: 20-35 m/min (65-115 SFM) **Welding:** - **Weldability:** Excellent - **Preheating:** 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:** 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 - Ultrasonic examination available as supplementary requirement - **Corrosion Testing:** Optional per customer requirements - **Certification:** Full traceability with comprehensive mill test certificates --- **Disclaimer:** This technical datasheet provides general information for reference purposes only. CF3MN stainless steel under ASTM A744 is designed for severe service applications and requires strict control of chemical composition and heat treatment. 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 CF3MN, ASTM A744 Specification Dimensions Size： Diameter 20-1000 mm Length <4181 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 CF3MN, ASTM A744 Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel Seamless tube CF3MN, ASTM A744 -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel Seamless tube CF3MN, ASTM A744 -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel Seamless tube CF3MN, 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 Seamless tube 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 652 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