Alloy 330,Incoloy 330,,E FORU

### **Alloy 330 / Incoloy 330 (UNS N08330) - Product Introduction** **Overview** **Incoloy 330** (UNS N08330) is a high-performance, nickel-iron-chromium austenitic alloy renowned for its exceptional resistance to oxidation, carburization, and thermal cycling at high temperatures. Unlike many other alloys in the Incoloy family, its primary strength is not resistance to aqueous corrosion, but its ability to retain strength and resist degradation in high-temperature environments up to 1177°C (2150°F). The alloy is stabilized with silicon, which forms a tight, adherent oxide scale that protects the underlying metal from further oxidation and prevents carburization. This combination of properties makes Alloy 330 a premier choice for high-temperature furnace components, heat treatment equipment, and industrial heating systems. --- #### **1. Chemical Composition** The chemical composition (in weight %) is carefully balanced for high-temperature service. | Element | Content (%) | Role & Benefit | | :--- | :--- | :--- | | **Nickel (Ni)** | 34.0 - 37.0 | Provides fundamental austenitic phase stability, resistance to oxidation, and carburization. | | **Chromium (Cr)** | 17.0 - 20.0 | Forms a protective chromium oxide scale (Cr₂O₃) for resistance to oxidation and sulfidation. | | **Iron (Fe)** | Balance | The base element of the alloy. | | **Silicon (Si)** | 0.75 - 1.50 | **Critical element.** Enhances resistance to carburization and oxidation by promoting a stable, protective silica-rich surface scale. | | **Manganese (Mn)** | ≤ 2.00 | Aids in deoxidation during melting and improves hot workability. | | **Carbon (C)** | 0.05 - 0.10 | Provides high-temperature strength through solid solution strengthening. | | **Phosphorus (P)** | ≤ 0.030 | Impurity element, controlled to prevent embrittlement. | | **Sulfur (S)** | ≤ 0.030 | Impurity element, controlled to improve hot workability. | *Note: "Incoloy" is a registered trademark of Special Metals Corporation (now part of Haynes International). "Incoloy 330" is their specific brand of UNS N08330.* --- #### **2. Physical Properties** These properties are critical for thermal and mechanical design in high-temperature applications. | Property | Typical Value | | :--- | :--- | | **Density** | 8.08 g/cm³ (0.292 lb/in³) | | **Melting Range** | 1371 - 1427 °C (2500 - 2600 °F) | | **Specific Heat (20°C)** | 460 J/kg·K | | **Thermal Conductivity** | 12.5 W/m·K (at 100°C) | | **Mean Coefficient of Thermal Expansion (20-1000°C)** | 16.5 μm/m·°C | | **Modulus of Elasticity (Tensile)** | 196 GPa (28.4 x 10⁶ psi) at 21°C | | **Magnetic Permeability (Annealed)** | Typically < 1.05 (Essentially non-magnetic) | --- #### **3. Mechanical Properties (Typical for Annealed Condition)** Alloy 330 maintains good strength at both room and elevated temperatures. **Room Temperature Properties:** | Property | Value | | :--- | :--- | | **Tensile Strength** | 620 MPa (90 ksi) min. | | **Yield Strength (0.2% Offset)** | 310 MPa (45 ksi) min. | | **Elongation (in 2 inches / 50mm)** | 30% min. | | **Hardness (Rockwell B)** | ≤ 85 HRB | **Elevated Temperature Strength:** Alloy 330 retains a significant portion of its strength at high temperatures, with a typical yield strength of around 120 MPa (17 ksi) at 1000°C (1830°F). --- #### **4. Product Applications** Incoloy 330 is the material of choice for a wide range of high-temperature thermal processing equipment. * **Heat Treating Industry:** * Radiant tubes, muffles, retorts, and baskets for carburizing, nitriding, and carbonitriding furnaces. * Lead pots and fixture components. * **Industrial Furnaces:** * Rollers, rails, and conveyor belts for continuous strip annealing and sintering furnaces. * Heat exchanger components and internals for reformer and cracking furnaces. * **Petrochemical Processing:** * Tube hangers, supports, and internals in ethylene cracking furnaces where resistance to carburization and thermal cycling is critical. * **Glass Manufacturing:** Support hooks, frames, and parts in glass molding and annealing lehrs. * **Calciners and Incinerators:** Internal components exposed to cyclic heating and corrosive gases. --- #### **5. International Standards** Incoloy 330 (UNS N08330) is specified in various international standards for different product forms. | Product Form | Standard Specification | | :--- | :--- | | **Plate, Sheet, and Strip** | ASTM B536, ASME SB536 | | **Seamless Pipe and Tube** | ASTM B535, ASME SB535, ASTM B163, ASME SB163 | | **Welded Pipe and Tube** | ASTM B546, ASME SB546, ASTM B517, ASME SB517 | | **Bar, Rod, and Wire** | ASTM B511, ASME SB511, ASTM B512 | | **Forgings** | ASTM B564, ASME SB564 | | **European Material Designation** | **EN 1.4864** (X15NiCrSi35-16) | --- **Summary** **Incoloy 330 (Alloy 330 / UNS N08330)** is a premier, nickel-iron-chromium alloy engineered specifically for extreme high-temperature service. Its optimized composition, particularly the deliberate addition of silicon, provides outstanding resistance to oxidation, carburization, and thermal cycling. While not designed for aqueous corrosion, its ability to maintain structural integrity and resist environmental degradation in temperatures up to 1177°C makes it an indispensable material for furnace components, heat treatment fixtures, and critical hardware in the thermal processing, petrochemical, and glass industries. Governed by ASTM and other international standards, it is a benchmark for reliability in high-temperature applications.

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 1705 gallon liquid totes Special package is available on request.