Cast Stainless Steel Rod/Bar CH20, ASTM A743

Cast Stainless Steel Rod CH20, ASTM A743 Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel Rod CH20, ASTM A743 Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel CH20, ASTM A743 Product Information -:- For detailed product information, please contact sales. -: ### **Technical Datasheet: Cast Stainless Steel CH20 (ASTM A743)** #### **1. Product Overview** Cast Stainless Steel CH20 under ASTM A743 specification is a heat-resistant austenitic stainless steel designed for general high-temperature applications. This 25Cr-12Ni type alloy offers excellent oxidation resistance and maintains good mechanical properties at elevated temperatures up to 1150°C (2100°F). CH20 is particularly suitable for various industrial applications requiring resistance to oxidation, thermal cycling, and moderate corrosive environments at high temperatures. **Key Advantages:** - **Excellent High-Temperature Strength:** Maintains mechanical integrity under prolonged high-temperature exposure - **Superior Oxidation Resistance:** Outstanding scaling resistance in oxidizing atmospheres - **Good Thermal Fatigue Resistance:** Withstands repeated thermal cycling - **Versatile Application Range:** Suitable for various high-temperature environments - **Good Corrosion Resistance:** Performs well in moderate corrosive conditions --- #### **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 J93402:** 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 is balanced for optimal high-temperature performance in general applications. | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.20 max | | Manganese (Mn) | 2.00 max | | Silicon (Si) | 0.75-1.50 | | Phosphorus (P), max | 0.04 | | Sulfur (S), max | 0.04 | | Chromium (Cr) | 22.0-26.0 | | Nickel (Ni) | 12.0-15.0 | | Iron (Fe) | Balance | *Note: The high chromium content provides superior oxidation resistance, while nickel ensures austenitic structure stability at elevated temperatures.* --- #### **4. Mechanical Properties** Mechanical properties are determined in the heat-treated condition as required by ASTM A743. **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: 85-100 MPa (12-14.5 ksi) - **At 980°C (1800°F):** Tensile Strength: 65-80 MPa (9.4-11.6 ksi) - **Creep Strength:** Good performance up to 1150°C (2100°F) - **Stress Rupture:** Maintains integrity under sustained loading --- #### **5. Physical Properties (Typical Values)** - **Density:** 7.90 g/cm³ (0.285 lb/in³) - **Modulus of Elasticity:** 195 GPa (28,300 ksi) at 21°C - **Poisson's Ratio:** 0.28 - **Thermal Conductivity:** 14.5 W/m·K (at 100°C) - **Specific Heat Capacity:** 500 J/kg·K (at 0-100°C) - **Coefficient of Thermal Expansion:** 16.0 × 10⁻⁶/°C (20-100°C) - **Electrical Resistivity:** 0.85 μΩ·m - **Magnetic Permeability:** Essentially non-magnetic --- #### **6. Heat Treatment** **Solution Annealing Treatment:** - **Temperature Range:** 1120-1170°C (2050-2140°F) - **Soak Time:** 1-2 hours per inch of thickness, minimum 1 hour - **Cooling Method:** Rapid water quench or air cool - **Objective:** To achieve complete solutionizing and homogeneous austenitic structure **Stress Relieving (Optional):** - **Temperature:** 870-925°C (1600-1700°F) - **Purpose:** To relieve casting and fabrication stresses --- #### **7. High-Temperature Performance** CH20 offers excellent performance in high-temperature applications: - **Oxidation Resistance:** Excellent scaling resistance up to 1150°C (2100°F) - **Creep Strength:** Good resistance to deformation under prolonged stress - **Thermal Fatigue:** Excellent resistance to thermal cycling - **Carburization Resistance:** Good performance in carburizing atmospheres - **Sulfidation Resistance:** Moderate resistance to sulfur-containing environments - **Microstructural Stability:** Resists embrittlement phases formation --- #### **8. Product Applications** CH20 cast stainless steel is widely used in high-temperature applications across various industries: **Heat Treatment Industry:** - Furnace radiant tubes - Heat treatment fixtures - Annealing covers - Carburizing equipment components **Petrochemical Industry:** - Reform furnace components - Process heater parts - High-temperature piping - Reactor internals **Power Generation:** - Boiler components - Heat exchanger parts - Burner nozzles - High-temperature ducting **Other Applications:** - Ceramic kiln furniture - Glass manufacturing equipment - Incinerator components - Thermal processing equipment --- #### **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 angles - Recommended cutting speeds: 15-25 m/min (50-80 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 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. CH20 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 CH20, ASTM A743 Specification Dimensions Size： Diameter 20-1000 mm Length <4203 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 CH20, ASTM A743 Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel Rod CH20, ASTM A743 -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel Rod CH20, ASTM A743 -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel Rod CH20, 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 674 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