Cast Stainless Steel Rod/Bar CK20, ASTM A451

Cast Stainless Steel Rod CK20, ASTM A451 Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel Rod CK20, ASTM A451 Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel CK20, ASTM A451 Product Information -:- For detailed product information, please contact sales. -: ### **Technical Datasheet: Cast Stainless Steel CK20 (ASTM A451)** #### **1. Product Overview** Cast Stainless Steel CK20 under ASTM A451 specification is a centrifugally cast high-temperature austenitic stainless steel pipe designed for extreme service conditions. This high-carbon 25Cr-20Ni alloy offers superior creep resistance and exceptional oxidation resistance at temperatures up to 1150°C (2100°F). The centrifugal casting process ensures a dense, homogeneous microstructure with enhanced mechanical properties, making it particularly suitable for pressure-containing components in severe high-temperature applications. **Key Advantages:** - **Exceptional Creep Resistance:** Superior performance under sustained loading at elevated temperatures - **Outstanding Oxidation Resistance:** Excellent scaling resistance in aggressive atmospheres - **Superior High-Temperature Strength:** Maintains mechanical integrity under extreme thermal conditions - **Enhanced Structural Stability:** Resists microstructural degradation during long-term service - **Optimized for Centrifugal Casting:** Specifically designed for pipe and tubular applications --- #### **2. International Standard** This product conforms to the latest edition of: - **ASTM A451/A451M:** Standard Specification for Centrifugally Cast Austenitic Steel Pipe for High-Temperature Service Additional applicable standards: - **UNS J94224:** Unified Numbering System designation - **ASME SA451:** ASME Boiler and Pressure Vessel Code equivalent - **ASTM A608/A608M:** Specification for High-Alloy Centrifugally Cast Tubing - **ISO 11972:** Corrosion-resistant cast steels for general applications --- #### **3. Chemical Composition (Heat Analysis, %)** The chemical composition is optimized for centrifugal casting and high-temperature performance. | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.35-0.45 | | Manganese (Mn) | 1.50 max | | Silicon (Si) | 1.75 max | | Phosphorus (P), max | 0.04 | | Sulfur (S), max | 0.04 | | Chromium (Cr) | 24.0-28.0 | | Nickel (Ni) | 18.0-22.0 | | Iron (Fe) | Balance | *Note: The elevated carbon content combined with chromium and nickel provides superior high-temperature strength and creep resistance for centrifugally cast pipe applications.* --- #### **4. Mechanical Properties** Mechanical properties meet ASTM A451 requirements for centrifugally cast high-temperature pipe. **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: 140-170 MPa (20-25 ksi) - **At 980°C (1800°F):** Tensile Strength: 90-120 MPa (13-17 ksi) - **Creep Strength:** Exceptional performance up to 1150°C (2100°F) - **Stress Rupture:** Superior 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:** 1150-1205°C (2100-2200°F) - **Soak Time:** Appropriate for wall thickness, minimum 1 hour - **Cooling Method:** Rapid cool suitable for pipe configuration - **Objective:** To achieve complete solutionizing and optimal high-temperature properties **Stabilization Treatment (Recommended):** - **Temperature:** 900-950°C (1650-1740°F) - **Purpose:** To enhance microstructural stability for long-term service --- #### **7. High-Temperature Performance** CK20 demonstrates exceptional performance in severe high-temperature pipe 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:** Excellent resistance to embrittlement phases - **Pressure Containment:** Reliable performance under combined thermal and pressure stresses --- #### **8. Product Applications** CK20 centrifugally cast stainless steel is extensively used in the most demanding high-temperature applications: **Ethylene Production:** - Cracking furnace tubes - Transfer line exchangers - Quench cooler tubes - Pyrolysis coils **Petrochemical Industry:** - Reform furnace tubes - Heater tubes - Steam methane reformer tubes - High-temperature reactors **Power Generation:** - Superheater tubes - Reheater components - High-temperature headers - Boiler pressure parts **Heat Processing Industry:** - Radiant tubes - Heat treatment furnace components - Annealing retorts - Thermal processing equipment --- #### **9. Fabrication & Welding Characteristics** **Casting Characteristics:** - Specifically designed for centrifugal casting process - Excellent fluidity and casting characteristics - Produces dense, homogeneous wall structure - Suitable for various pipe diameters and wall thicknesses **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 high-temperature alloys - **Post-weld Heat Treatment:** Full solution 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 - Ultrasonic examination for wall thickness verification - **High-Temperature Testing:** - Creep and stress rupture testing - Oxidation resistance evaluation - **Hydrostatic Testing:** Required per specification requirements - **Dimensional Inspection:** Comprehensive dimensional verification - **Certification:** Full traceability with comprehensive mill test certificates --- **Disclaimer:** This technical datasheet provides general information for reference purposes only. CK20 stainless steel under ASTM A451 is specifically designed for centrifugally cast high-temperature pressure applications and requires careful consideration of service conditions. Always consult the complete ASTM A451 standard and work with qualified materials engineers for critical applications. The material's performance may be affected by specific operating conditions, and proper design considerations for thermal expansion, creep, and pressure containment are essential for successful long-term performance in elevated temperature service. -:- For detailed product information, please contact sales. -: Cast Stainless Steel CK20, ASTM A451 Specification Dimensions Size： Diameter 20-1000 mm Length <4207 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 A451 Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel Rod CK20, ASTM A451 -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel Rod CK20, ASTM A451 -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel Rod CK20, ASTM A451 -:- 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 678 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