Cast Stainless Steel Capillary CK20, ACI

Cast Stainless Steel Capillary CK20, ACI Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel Capillary CK20, ACI Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel CK20, ACI Product Information -:- For detailed product information, please contact sales. -: ### **Technical Datasheet: Cast Stainless Steel CK20 (ACI)** #### **1. Product Overview** Cast Stainless Steel CK20 under ACI (Alloy Casting Institute) specification is a premium heat-resistant austenitic stainless steel designed for the most severe high-temperature service conditions. This high-performance alloy belongs to the HP series (25Cr-35Ni-Nb) and offers exceptional resistance to oxidation, carburization, and thermal cycling at temperatures up to 1200°C (2190°F). The material demonstrates outstanding creep rupture strength and microstructural stability, making it ideal for critical components in high-temperature processing industries. **Key Advantages:** - **Exceptional High-Temperature Strength:** Superior mechanical properties maintained under extreme thermal conditions - **Outstanding Creep Resistance:** Excellent performance under sustained loading at elevated temperatures - **Superior Oxidation Resistance:** Outstanding scaling resistance in aggressive atmospheres - **Enhanced Microstructural Stability:** Niobium stabilization prevents sensitization and embrittlement - **Excellent Carburization Resistance:** Superior performance in carburizing environments --- #### **2. International Standard** This product conforms to the following international standards: - **ACI Standard:** Alloy Casting Institute specification for HP-type modified heat-resistant alloys - **ASTM A297/A297M:** Standard Specification for Steel Castings, Iron-Chromium, Iron-Chromium-Nickel, Heat-Resistant - **UNS J94204:** Unified Numbering System designation - **ASME SA297:** ASME Boiler and Pressure Vessel Code equivalent - **ISO 11972:** Corrosion-resistant cast steels for general applications --- #### **3. Chemical Composition (Heat Analysis, %)** The chemical composition features niobium stabilization for enhanced high-temperature performance. | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.35-0.45 | | Manganese (Mn) | 2.00 max | | Silicon (Si) | 1.00-2.00 | | Phosphorus (P), max | 0.04 | | Sulfur (S), max | 0.04 | | Chromium (Cr) | 24.0-28.0 | | Nickel (Ni) | 33.0-37.0 | | Niobium (Nb) | 0.80-1.20 | | Iron (Fe) | Balance | *Note: The high nickel and chromium content combined with niobium stabilization provides exceptional high-temperature strength and microstructural stability for severe service conditions.* --- #### **4. Mechanical Properties** Mechanical properties are guaranteed in the heat-treated condition. **Minimum Required Values (Solution Annealed Condition):** - **Tensile Strength:** 485 MPa (70 ksi) min - **Yield Strength (0.2% Offset):** 240 MPa (35 ksi) min - **Elongation in 2" (50 mm):** 8.0% min **Elevated Temperature Properties (Typical):** - **At 870°C (1600°F):** Tensile Strength: 150-180 MPa (22-26 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:** 7.95 g/cm³ (0.287 lb/in³) - **Modulus of Elasticity:** 200 GPa (29,000 ksi) at 21°C - **Poisson's Ratio:** 0.29 - **Thermal Conductivity:** 14.0 W/m·K (at 100°C) - **Specific Heat Capacity:** 520 J/kg·K (at 0-100°C) - **Coefficient of Thermal Expansion:** 15.5 × 10⁻⁶/°C (20-100°C) - **Electrical Resistivity:** 0.95 μΩ·m - **Magnetic Permeability:** Essentially non-magnetic --- #### **6. Heat Treatment** **Solution Annealing Treatment:** - **Temperature Range:** 1175-1225°C (2150-2235°F) - **Soak Time:** 2-4 hours depending on section size - **Cooling Method:** Rapid water quench - **Objective:** To achieve complete solutionizing and carbide dissolution **Stabilization Treatment:** - **Temperature:** 900-950°C (1650-1740°F) - **Soak Time:** 4-8 hours - **Purpose:** To precipitate secondary carbides for enhanced stability --- #### **7. High-Temperature Performance** CK20 demonstrates exceptional performance in severe high-temperature environments: - **Oxidation Resistance:** Outstanding scaling resistance up to 1200°C (2190°F) - **Carburization Resistance:** Excellent performance in carburizing atmospheres - **Sulfidation Resistance:** Good resistance to sulfur-containing environments - **Thermal Fatigue:** Exceptional resistance to thermal cycling and shock - **Creep Rupture:** Superior long-term performance under stress - **Microstructural Stability:** Excellent resistance to sigma phase formation --- #### **8. Product Applications** CK20 cast stainless steel is extensively used in the most demanding high-temperature applications: **Ethylene and Petrochemical Industry:** - Pyrolysis furnace tubes and fittings - Transfer line exchangers - Cracking furnace components - Quench boiler tubes **Heat Treatment Industry:** - Radiant tubes and retorts - Furnace rolls and rollers - Heat treatment fixtures - Carburizing and annealing equipment **Power Generation:** - Superheater and reheater components - Boiler hangers and supports - High-temperature headers - Waste heat recovery systems **Other Applications:** - Ceramic kiln furniture - Glass tank components - Incinerator parts - Reform furnace tubes --- #### **9. Fabrication & Welding Characteristics** **Casting Characteristics:** - Good castability with proper foundry techniques - Pattern shrinkage: 20-25 mm/m - Requires careful gating and risering - 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: 10-20 m/min (35-65 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:** ENiCrCoMo-1 or equivalent high-temperature alloys - **Post-weld Heat Treatment:** Full solution annealing recommended --- #### **10. Quality Assurance & Testing** - **Chemical Analysis:** Complete chemical composition verification - **Mechanical Testing:** Comprehensive mechanical property testing - **High-Temperature Testing:** - Creep and stress rupture testing - Oxidation resistance testing per ASTM G54 - Cyclic oxidation testing - **Non-Destructive Testing:** - Radiographic examination - Liquid penetrant testing - Dimensional verification - **Metallurgical Analysis:** - Microstructure evaluation - Carbide morphology analysis - **Certification:** Full material traceability with comprehensive test reports --- **Disclaimer:** This technical datasheet provides general information for reference purposes only. CK20 stainless steel under ACI specification is specifically designed for severe high-temperature applications and requires careful consideration of service conditions. The information contained herein is based on typical industry data and should be verified for specific applications. Always consult relevant standards and work with qualified materials engineers for critical high-temperature applications. Performance characteristics may vary based on specific manufacturing processes, heat treatment parameters, and service conditions. Proper design considerations for thermal expansion, creep behavior, and atmospheric compatibility are essential for successful long-term performance in demanding high-temperature service environments. -:- For detailed product information, please contact sales. -: Cast Stainless Steel CK20, ACI Specification Dimensions Size： Diameter 20-1000 mm Length <4209 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, ACI Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel Capillary CK20, ACI -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel Capillary CK20, ACI -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel Capillary CK20, ACI -:- 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 Capillary 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 680 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