Cast Stainless Steel CB7Cu-2, ASTM A747

Cast Stainless Steel CB7Cu-2, ASTM A747 Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel CB7Cu-2, ASTM A747 Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel CB7Cu-2, ASTM A747 Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: Cast Stainless Steel CB7Cu-2, ASTM A747** #### **1. Product Overview** Cast Stainless Steel CB7Cu-2 under ASTM A747 specification is a precipitation-hardening martensitic stainless steel designed to provide an optimal balance of high strength, good corrosion resistance, and excellent mechanical properties. As an enhanced version of the CB7Cu series, this alloy offers improved performance characteristics through optimized chemical composition and heat treatment response. The material is particularly suitable for applications requiring superior strength-to-weight ratio and resistance to corrosive environments. **Key Advantages:** - **Enhanced Strength Properties:** Higher strength capabilities compared to standard precipitation-hardening grades - **Good Corrosion Resistance:** Excellent performance in various corrosive environments - **Precipitation Hardening Capability:** Achieves high strength through simple aging treatment - **Excellent Fatigue Strength:** Superior resistance to dynamic loading conditions - **Good Dimensional Stability:** Minimal distortion during heat treatment --- #### **2. International Standard** This product conforms to the latest edition of: - **ASTM A747/A747M:** Standard Specification for Steel Castings, Stainless, Precipitation Hardening Additional applicable standards: - **UNS J92180:** Unified Numbering System designation (shared with CB7Cu-1) - **ASME SA747:** ASME Boiler and Pressure Vessel Code equivalent - **AMS 5355:** Aerospace Material Specification --- #### **3. Chemical Composition (Heat Analysis, %)** The chemical composition is carefully balanced to enhance precipitation hardening response and mechanical properties. | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.07 max | | Manganese (Mn) | 1.00 max | | Silicon (Si) | 1.00 max | | Phosphorus (P), max | 0.04 | | Sulfur (S), max | 0.03 | | Chromium (Cr) | 14.0-15.5 | | Nickel (Ni) | 4.5-5.5 | | Copper (Cu) | 2.5-3.5 | | Columbium + Tantalum (Cb+Ta) | 0.15-0.35 | | Molybdenum (Mo) | 0.5-1.0 | *Note: The modified composition provides enhanced strength and corrosion resistance properties.* --- #### **4. Mechanical Properties** Mechanical properties are achieved through specific aging treatments as defined in ASTM A747. **Condition H1150 (Aged at 1150°F/620°C):** - **Tensile Strength:** 1100 MPa (160 ksi) min - **Yield Strength (0.2% Offset):** 950 MPa (138 ksi) min - **Elongation in 2" (50 mm):** 10% min - **Reduction of Area:** 35% min - **Hardness:** 311-375 HBW **Condition H1100 (Aged at 1100°F/595°C):** - **Tensile Strength:** 1200 MPa (174 ksi) min - **Yield Strength:** 1100 MPa (160 ksi) min - **Elongation:** 8% min - **Hardness:** 352-401 HBW **Condition H1075 (Aged at 1075°F/580°C):** - **Tensile Strength:** 1275 MPa (185 ksi) min - **Yield Strength:** 1170 MPa (170 ksi) min - **Elongation:** 6% min - **Hardness:** 388-444 HBW --- #### **5. Physical Properties (Typical Values)** - **Density:** 7.78 g/cm³ (0.281 lb/in³) - **Modulus of Elasticity:** 200 GPa (29,000 ksi) - **Poisson's Ratio:** 0.27-0.30 - **Thermal Conductivity:** 19.5 W/m·K (at 100°C) - **Specific Heat Capacity:** 460 J/kg·K (at 0-100°C) - **Coefficient of Thermal Expansion:** 10.9 × 10⁻⁶/°C (20-100°C) - **Magnetic Permeability:** Magnetic in all heat-treated conditions --- #### **6. Heat Treatment** **Standard Heat Treatment Sequence:** **Solution Annealing:** - Temperature: 1040-1060°C (1900-1940°F) - Soak time: 1-2 hours per inch of thickness - Cooling: Air cool or forced air cool **Precipitation Hardening (Aging):** - **Condition H1150:** 620°C ± 10°C (1150°F ± 20°F) for 4 hours - **Condition H1100:** 595°C ± 10°C (1100°F ± 20°F) for 4 hours - **Condition H1075:** 580°C ± 10°C (1075°F ± 20°F) for 4 hours - Cooling: Air cool to room temperature --- #### **7. Corrosion Resistance** - **Atmospheric:** Excellent resistance to industrial and marine environments - **Aqueous Solutions:** Good performance in fresh water, steam, and mild chemical solutions - **Chemical Media:** - Good resistance to organic acids and alkaline solutions - Moderate resistance to dilute mineral acids - Enhanced pitting resistance due to molybdenum content - **Stress Corrosion Cracking:** Improved resistance compared to standard martensitic grades - **Oxidation Resistance:** Good scaling resistance up to 600°C (1112°F) --- #### **8. Product Applications** CB7Cu-2 under ASTM A747 is utilized in high-performance applications requiring superior mechanical properties and corrosion resistance. **Primary Applications Include:** - **Aerospace Components:** Structural fittings, actuator components, and engine parts - **Defense Industry:** Weapon systems components, armored vehicle parts - **Marine Technology:** Propeller shafts, submarine components, naval hardware - **Oil & Gas Equipment:** Valve bodies, wellhead components, downhole tools - **Chemical Processing:** Pump shafts, mixer components, reactor parts - **Power Generation:** Turbine blades, compressor components, fasteners - **High-Performance Automotive:** Racing components, turbocharger parts --- #### **9. Fabrication & Welding Characteristics** **Casting Characteristics:** - Good castability with proper foundry techniques - Pattern shrinkage: 20-22 mm/m - Requires adequate feeding system design - Suitable for complex geometries and thin sections **Machining:** - Recommended in solution-treated condition - Use carbide tools with positive rake geometry - Cutting speeds: 15-25 m/min (50-80 SFM) - Adequate cooling and lubrication essential **Welding:** - **Weldability:** Good with proper procedures - Preheating: 150-200°C (300-400°F) recommended - Post-weld heat treatment: Full solution and aging treatment required - Filler metals: Matching composition or AWS E/ER630 --- #### **10. Quality Assurance & Testing** - **Chemical Analysis:** Per ASTM A751 specifications - **Mechanical Testing:** Tensile tests according to ASTM A370 - **Hardness Testing:** Multiple location verification - **Non-Destructive Examination:** - Radiographic testing per ASTM E94 - Liquid penetrant testing per ASTM E165 - Magnetic particle testing per ASTM E709 - **Heat Treatment Documentation:** Complete traceability of thermal cycles - **Certification:** Comprehensive mill test certificates with full traceability --- **Disclaimer:** This technical datasheet provides general information for reference purposes only. CB7Cu-2 stainless steel requires specific heat treatment to achieve the desired mechanical properties. Performance characteristics may vary based on casting design, heat treatment parameters, and service conditions. Always consult the complete ASTM A747 standard and qualified materials engineers for critical applications. Proper selection of aging condition is crucial for achieving the required balance of strength, toughness, and corrosion resistance. -:- For detailed product information, please contact sales. -: Cast Stainless Steel CB7Cu-2, ASTM A747 Specification Dimensions Size： Diameter 20-1000 mm Length <4173 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 CB7Cu-2, ASTM A747 Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel CB7Cu-2, ASTM A747 -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel CB7Cu-2, ASTM A747 -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel CB7Cu-2, ASTM A747 -:- 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 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 644 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