Cast Stainless Steel Tube,Pipe HK30, ASTM A351M

Cast Stainless Steel Tube HK30, ASTM A351M Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel Tube HK30, ASTM A351M Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel HK30, ASTM A351M Product Information -:- For detailed product information, please contact sales. -: ### **Technical Datasheet: Cast Stainless Steel HK30 (ASTM A351M)** #### **1. Product Overview** Cast Stainless Steel HK30 under ASTM A351M specification is a high-carbon austenitic heat-resistant stainless steel designed for pressure-containing parts in high-temperature service. As a 25Cr-20Ni type alloy, HK30 offers exceptional oxidation resistance and maintains excellent mechanical properties at temperatures up to 1150°C (2100°F). The elevated carbon content significantly enhances high-temperature strength and creep resistance, making it particularly suitable for demanding applications in petrochemical, power generation, and heat processing industries. **Key Advantages:** - **Superior High-Temperature Strength:** Excellent mechanical properties maintained under sustained thermal exposure - **Outstanding Creep Resistance:** Superior performance under prolonged stress at elevated temperatures - **Excellent Oxidation Resistance:** Outstanding scaling resistance in aggressive atmospheres - **Good Structural Stability:** Resists phase transformation and embrittlement - **Pressure-Containing Capability:** Suitable for high-temperature pressure applications --- #### **2. International Standard** This product conforms to the latest edition of: - **ASTM A351/A351M:** Standard Specification for Castings, Austenitic, Austenitic-Ferritic (Duplex), for Pressure-Containing Parts Additional applicable standards: - **UNS J94202:** Unified Numbering System designation - **ASME SA351:** ASME Boiler and Pressure Vessel Code equivalent - **ASTM A297/A297M:** Standard Specification for Steel Castings, Iron-Chromium, Iron-Chromium-Nickel, Heat-Resistant - **ISO 11972:** Corrosion-resistant cast steels for general applications --- #### **3. Chemical Composition (Heat Analysis, %)** The chemical composition features controlled high carbon content for enhanced high-temperature strength. | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.25-0.35 | | 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 elevated carbon content (0.25-0.35%) provides enhanced high-temperature strength and creep resistance while maintaining good oxidation resistance.* --- #### **4. Mechanical Properties** Mechanical properties meet ASTM A351M requirements for high-temperature pressure-containing parts. **Minimum Required Values (Solution Annealed Condition):** - **Tensile Strength:** 485 MPa min - **Yield Strength (0.2% Offset):** 205 MPa min - **Elongation in 50 mm:** 25.0% min **Elevated Temperature Properties (Typical):** - **At 815°C:** Tensile Strength: 130-160 MPa - **At 980°C:** Tensile Strength: 85-110 MPa - **Creep Strength:** Excellent performance up to 1150°C - **Stress Rupture:** Superior resistance under sustained loading --- #### **5. Physical Properties (Typical Values)** - **Density:** 7.92 g/cm³ - **Modulus of Elasticity:** 200 GPa 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:** 1140-1200°C - **Soak Time:** 1-2 hours per 25 mm thickness, minimum 1 hour - **Cooling Method:** Rapid water quench - **Objective:** To dissolve carbides and achieve homogeneous austenitic structure **Stabilization Treatment (Optional):** - **Temperature:** 870-925°C - **Purpose:** To enhance dimensional stability for high-temperature service --- #### **7. High-Temperature Performance** HK30 demonstrates excellent performance in high-temperature pressure applications: - **Oxidation Resistance:** Outstanding scaling resistance up to 1150°C - **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 - **Pressure Containment:** Reliable performance under combined thermal and mechanical stresses --- #### **8. Product Applications** HK30 cast stainless steel is extensively used in demanding high-temperature pressure applications: **Petrochemical Industry:** - Ethylene cracking furnace tubes - Reform furnace components - High-temperature reactors - Process heater tubes **Heat Treatment Industry:** - Radiant tubes - Heat treatment fixtures - Carburizing equipment - Annealing retorts **Power Generation:** - Superheater components - High-temperature headers - Boiler parts - Heat exchanger components **Other Applications:** - Chemical processing equipment - Incinerator components - Thermal oxidizer systems - High-temperature valve bodies --- #### **9. Fabrication & Welding Characteristics** **Casting Characteristics:** - Good castability with proper foundry practices - Pattern shrinkage: 25-30 mm/m - Requires adequate feeding for sound pressure-containing 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 **Welding:** - **Weldability:** Good with proper procedures - **Preheating:** 150-200°C recommended - **Interpass Temperature:** 200-250°C - **Filler Metals:** ENiCrFe-3 or equivalent nickel-base 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 from cast-on coupons - **Hardness Testing:** Multiple location verification - **Non-Destructive Testing:** - Radiographic examination per ASTM E94 - Liquid penetrant examination per ASTM E165 - **High-Temperature Testing:** - Creep and stress rupture testing - Oxidation resistance evaluation - **Pressure Testing:** Hydrostatic testing as required - **Certification:** Full traceability with comprehensive mill test certificates --- **Disclaimer:** This technical datasheet provides general information for reference purposes only. HK30 stainless steel under ASTM A351M is specifically designed for high-temperature pressure-containing applications and requires careful consideration of service conditions. Always consult the complete ASTM A351M 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 HK30, ASTM A351M Specification Dimensions Size： Diameter 20-1000 mm Length <4212 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 HK30, ASTM A351M Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel Tube HK30, ASTM A351M -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel Tube HK30, ASTM A351M -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel Tube HK30, ASTM A351M -:- 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 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 683 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