Cast Stainless Steel Rod/Bar CK20, ASTM A743

Cast Stainless Steel Rod CK20, ASTM A743 Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel Rod CK20, ASTM A743 Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel CK20, ASTM A743 Product Information -:- For detailed product information, please contact sales. -: ### **Technical Datasheet: Cast Stainless Steel CK20 (ASTM A743)** #### **1. Product Overview** Cast Stainless Steel CK20 under ASTM A743 specification is a high-carbon austenitic stainless steel designed for superior high-temperature performance in general applications. This 25Cr-20Ni alloy offers exceptional oxidation resistance and maintains excellent mechanical properties at temperatures up to 1150°C (2100°F). The elevated carbon content provides enhanced high-temperature strength and creep resistance, making it suitable for demanding high-temperature applications across various industrial sectors. **Key Advantages:** - **Superior High-Temperature Strength:** Excellent mechanical properties maintained at extreme temperatures - **Outstanding Oxidation Resistance:** Exceptional scaling resistance in aggressive atmospheres - **Enhanced Creep Resistance:** Superior performance under sustained loading - **Good Structural Stability:** Resists phase transformation and embrittlement - **Versatile Application Range:** Suitable for various 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 J94224:** Unified Numbering System designation - **ASME SA743:** ASME Boiler and Pressure Vessel Code equivalent - **ISO 11972:** Corrosion-resistant cast steels for general applications - **EN 10295:** Heat-resistant cast steels --- #### **3. Chemical Composition (Heat Analysis, %)** The chemical composition features controlled carbon content for optimal high-temperature performance. | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.20-0.40 | | Manganese (Mn) | 2.00 max | | Silicon (Si) | 0.75-1.50 | | Phosphorus (P), max | 0.04 | | Sulfur (S), max | 0.04 | | Chromium (Cr) | 23.0-27.0 | | Nickel (Ni) | 19.0-22.0 | | Iron (Fe) | Balance | *Note: The balanced composition with elevated carbon content provides optimal high-temperature strength and oxidation resistance for general applications.* --- #### **4. Mechanical Properties** Mechanical properties meet ASTM A743 requirements for high-temperature service. **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):** 25.0% min **Elevated Temperature Properties (Typical):** - **At 870°C (1600°F):** Tensile Strength: 120-150 MPa (17-22 ksi) - **At 980°C (1800°F):** Tensile Strength: 80-100 MPa (12-14.5 ksi) - **Creep Strength:** Excellent performance up to 1150°C (2100°F) - **Stress Rupture:** Good resistance under sustained loading --- #### **5. Physical Properties (Typical Values)** - **Density:** 7.92 g/cm³ (0.286 lb/in³) - **Modulus of Elasticity:** 200 GPa (29,000 ksi) at 21°C - **Poisson's Ratio:** 0.28 - **Thermal Conductivity:** 14.2 W/m·K (at 100°C) - **Specific Heat Capacity:** 510 J/kg·K (at 0-100°C) - **Coefficient of Thermal Expansion:** 15.8 × 10⁻⁶/°C (20-100°C) - **Electrical Resistivity:** 0.90 μΩ·m - **Magnetic Permeability:** Essentially non-magnetic --- #### **6. Heat Treatment** **Solution Annealing Treatment:** - **Temperature Range:** 1145-1205°C (2095-2200°F) - **Soak Time:** 1-2 hours per inch of thickness, minimum 1 hour - **Cooling Method:** Rapid water quench or air cool - **Objective:** To achieve homogeneous austenitic structure and optimal properties **Stabilization Treatment (Optional):** - **Temperature:** 870-925°C (1600-1700°F) - **Purpose:** To enhance dimensional stability for high-temperature service --- #### **7. High-Temperature Performance** CK20 demonstrates excellent performance in high-temperature applications: - **Oxidation Resistance:** Outstanding scaling resistance up to 1150°C (2100°F) - **Creep Strength:** Superior resistance to deformation under prolonged stress - **Thermal Fatigue:** Excellent performance under thermal cycling conditions - **Carburization Resistance:** Good performance in carburizing atmospheres - **Structural Stability:** Good resistance to embrittlement phases formation --- #### **8. Product Applications** CK20 cast stainless steel is widely used in demanding high-temperature applications: **Heat Treatment Industry:** - Furnace radiant tubes - Heat treatment fixtures - Annealing retorts - Carburizing equipment **Petrochemical Industry:** - Process heater components - Reform furnace parts - High-temperature piping - Reactor internals **Power Generation:** - Boiler components - Heat exchanger parts - High-temperature ducting - Burner nozzles **Other Applications:** - Ceramic kiln furniture - Glass manufacturing equipment - Incinerator components - Thermal processing fixtures --- #### **9. Fabrication & Welding Characteristics** **Casting Characteristics:** - Good castability with proper foundry practices - Pattern shrinkage: 25-30 mm/m - Requires adequate feeding for sound castings - Suitable for complex high-temperature components **Machining:** - Moderate machinability in annealed condition - Work hardens during machining operations - Use carbide tools with positive rake geometry - Recommended cutting speeds: 15-20 m/min (50-65 SFM) **Welding:** - **Weldability:** Good with proper procedures - **Preheating:** 150-200°C (300-400°F) recommended - **Interpass Temperature:** 200-250°C (400-480°F) - **Filler Metals:** ENiCrFe-3 or equivalent nickel-base alloys - **Post-weld Heat Treatment:** Stress relief annealing recommended --- #### **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 - **High-Temperature Testing:** - Oxidation resistance testing per ASTM G54 - Creep testing available upon request - **Certification:** Full traceability with comprehensive mill test certificates --- **Disclaimer:** This technical datasheet provides general information for reference purposes only. CK20 stainless steel under ASTM A743 is designed for high-temperature applications and requires careful consideration of service conditions. The material's performance may vary based on specific operating conditions, casting design, and manufacturing processes. Always consult the complete ASTM A743 standard and work with qualified materials engineers for critical applications. Proper design considerations for thermal expansion, creep behavior, and atmospheric compatibility are essential for successful long-term performance in elevated temperature service. -:- For detailed product information, please contact sales. -: Cast Stainless Steel CK20, ASTM A743 Specification Dimensions Size： Diameter 20-1000 mm Length <4208 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 CK20, ASTM A743 Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel Rod CK20, ASTM A743 -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel Rod CK20, ASTM A743 -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel Rod CK20, ASTM A743 -:- 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 Rod 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 679 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