CY-40 Cast UNS N06040 Severe Corrosion and Heat Resistant Alloy,1

### **Product Introduction: CY-40 (Cast UNS N06040) Severe Corrosion and Heat Resistant Alloy** **Overview** CY-40, designated as UNS N06040 in the cast form, is a nickel-chromium-iron casting alloy renowned for its exceptional resistance to high-temperature oxidation and corrosion. It is the cast equivalent of the widely used wrought alloy UNS N06045 (also known as Alloy 45TM). CY-40 is specifically designed to withstand oxidizing, carburizing, and sulfur-bearing atmospheres at temperatures up to 1200°C (2200°F). Its excellent structural stability, good creep rupture strength, and superior resistance to thermal fatigue make it a cost-effective and reliable choice for a wide range of industrial heating and thermal processing applications. --- #### **Chemical Composition (Typical % by Weight, per ASTM A494)** The composition of CY-40 is balanced to provide optimal high-temperature performance and fabricability. | Element | Content (%) | Role & Benefit | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Forms the stable austenitic matrix, providing the fundamental resistance to oxidation and carburization. | | **Chromium (Cr)** | 24.0 - 26.0 | The key element for oxidation resistance. Forms a durable, self-healing chromium oxide (Cr₂O₃) scale on the surface, protecting the base metal from further degradation at high temperatures. | | **Iron (Fe)** | 21.0 - 25.0 | Provides solid-solution strengthening and helps control cost while maintaining good high-temperature properties. | | **Manganese (Mn)**| 1.0 - 2.0 | Aids in castability and helps control sulfur content. | | **Silicon (Si)** | 0.50 - 1.50 | Enhances resistance to oxidation and carburization by promoting the formation of a stable, protective scale. | | **Carbon (C)** | 0.20 - 0.40 | Provides strengthening through carbide formation, primarily at grain boundaries, which enhances high-temperature creep strength. | | **Copper (Cu)** | 0.20 max | A residual element. | | **Sulfur (S)** | 0.03 max | A detrimental element kept to a minimum to prevent hot cracking and maintain ductility. | *Note: "Alloy 45TM" is a trademark of a specific manufacturer.* --- #### **Physical & Mechanical Properties (Typical)** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.08 g/cm³ (0.292 lb/in³) | | **Melting Range** | 1350 - 1400 °C (2460 - 2550 °F) | | **Specific Heat** | 460 J/kg·K (0.110 BTU/lb·°F) @ 20°C | | **Thermal Conductivity**| 12.5 W/m·K (86.6 BTU·in/hr·ft²·°F) @ 100°C | | **Thermal Expansion** | 13.5 μm/m·°C (7.5 μin/in·°F) @ 20-100°C | | **Tensile Strength** | 483 MPa (70 ksi) min | | **Yield Strength (0.2% Offset)** | 241 MPa (35 ksi) min | | **Elongation** | 10% min | --- #### **International Standards and Specifications** CY-40 is recognized and specified by key international standards for cast components. * **Cast Product Standards:** * **ASTM A494 / A494M:** Standard Specification for Castings, Nickel and Nickel Alloy. (Grade CY-40) * **UNS N06040:** Unified Numbering System designation for the cast alloy. * **Wrought Equivalent:** * **UNS N06045:** The standard wrought form of this alloy (e.g., plate, sheet, bar). * **ASTM B166:** Standard Specification for Nickel-Chromium-Iron Alloy Rod, Bar, and Wire. --- #### **Product Applications** CY-40 cast components are extensively used in applications where resistance to heat and oxidation is the primary requirement. 1. **Industrial Furnaces & Heat Treating:** * Furnace muffles, retorts, and radiant tubes. * Heat treatment baskets, trays, and fixtures. * Rollers and rails for roller hearth furnaces. * Components for carburizing and carbonitriding furnaces. 2. **Petrochemical Processing:** * Tube hangers and supports in steam methane reformers and ethylene cracking furnaces. * Process components exposed to high-temperature hydrocarbon atmospheres. 3. **Power Generation:** * Heat exchanger components and supports in boiler systems. * Burner nozzles and other high-temperature fixtures. 4. **Glass Manufacturing:** * Support hooks, brackets, and hardware used in glass annealing and tempering lehrs. #### **Key Advantages** * **Excellent Oxidation Resistance:** The high chromium content provides superior protection against scaling and oxidation at temperatures up to 1150°C (2100°F). * **Good Carburization & Sulfidation Resistance:** Performs well in atmospheres that would rapidly degrade standard stainless steels. * **Good Structural Stability:** Maintains its microstructure and mechanical properties after long-term exposure to high temperatures. * **Cost-Effectiveness:** Offers a favorable balance of performance and cost compared to more highly alloyed nickel-base superalloys, providing excellent value for many high-temperature applications. **Conclusion** CY-40 (UNS N06040) is a proven and highly reliable nickel-chromium casting alloy specifically designed for high-temperature service in oxidizing and corrosive atmospheres. Its robust combination of oxidation resistance, structural stability, and good creep strength makes it an ideal material for critical components in industrial heating, heat treating, and petrochemical processing. As a cost-effective solution backed by the international standard ASTM A494, CY-40 continues to be a trusted choice for extending the service life of equipment operating under severe thermal conditions.

Packing of Standard Packing: 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 3399 gallon liquid totes Special package is available on request.