Alloy 330，Incoloy 330 Fittings，

British Specs:，American Specs: AMS 5716 Sheet and Strip，German Specs:

Alloy 330 (Incoloy 330 Wire) - Introduction with Composition, Properties, Applications and Product Forms

Alloy 330, commercially known as Incoloy 330, is a nickel-iron-chromium alloy celebrated for its exceptional high-temperature oxidation resistance and excellent strength retention in thermal cycling environments. This high-performance alloy is specifically engineered to withstand prolonged exposure to temperatures up to 1150°C (2102°F), making it a preferred choice for extreme heat applications. It is available in a comprehensive range of forms to meet diverse industrial needs, including Bar (Round bar, Flat bar), Ribbon, Wire, Rods, Tube, Pipe, Foil, Plate, Sheet, Strip, and Forging Stock. Incoloy 330 Wire, in particular, is valued for its flexibility, high-temperature stability, and resistance to carburization, making it ideal for intricate components in heat treatment, industrial heating, and aerospace industries. Below is a detailed overview of its chemical composition, key properties, practical applications, and available product forms.

Chemical Composition

The precisely balanced chemical composition of Alloy 330 (Incoloy 330) is the foundation of its exceptional high-temperature performance and oxidation resistance. The typical composition (by weight) is as follows:

Nickel (Ni): 34-37% (primary matrix element, providing high-temperature stability and corrosion resistance)

Iron (Fe): 32-36% (enhances mechanical strength and fabricability)

Chromium (Cr): 17-20% (critical for oxidation resistance, forming a protective chromium oxide layer at elevated temperatures)

Carbon (C): 0.08-0.15% (improves high-temperature strength and resistance to carburization)

Manganese (Mn): ≤ 2.0% (aids in deoxidation during manufacturing and improves weldability)

Silicon (Si): 0.5-1.0% (assists in forming a stable oxide layer, enhancing oxidation resistance)

Copper (Cu): ≤ 0.75% (improves resistance to sulfur-containing environments)

Sulfur (S): ≤ 0.03% (kept at low levels to ensure good ductility and weldability)

Phosphorus (P): ≤ 0.03% (controlled to maintain corrosion resistance and avoid embrittlement)

Nickel + Iron + Chromium: ≥ 95% (ensuring the alloy’s core high-temperature properties)

This composition, with its high nickel and chromium content, delivers the alloy's signature resistance to oxidation, carburization, and thermal shock, making it suitable for the most demanding high-heat industrial environments.

Key Properties

Alloy 330 (Incoloy 330 Wire) and its various forms exhibit a robust set of properties that make them indispensable in high-temperature, corrosive, and thermally cycled applications:

Mechanical Properties (room temperature, annealed condition):

Tensile strength: 550-690 MPa (79,800-100,100 psi)

Yield strength (0.2% offset): 240-310 MPa (34,800-44,900 psi)

Elongation (in 50 mm): 30-40% (excellent ductility, enabling complex forming and welding across all product forms)

Hardness: 150-190 HB (Brinell hardness, indicating good machinability and workability)

High-Temperature Performance:

Thermal stability: Maintains significant strength up to 1150°C (2102°F), with tensile strength remaining above 140 MPa at 1000°C (1832°F)

Creep resistance: Exhibits good creep resistance at 800-1000°C (1472-1832°F), suitable for long-term service under sustained stress in high-temperature systems

Oxidation resistance: Exceptional resistance to oxidation in air and combustion gases up to 1150°C (2102°F), forming a dense, self-healing chromium oxide layer that prevents further degradation

Thermal shock resistance: Superior resistance to thermal cycling, making it ideal for applications with rapid temperature fluctuations (e.g., from ambient to 1000°C and back)

Carburization resistance: Resistant to carburization in carbon-rich environments, such as industrial furnaces, due to its controlled carbon content

Corrosion Resistance:

High-temperature corrosion: Resistant to sulfidation in sulfur-containing gases, making it suitable for fossil fuel combustion environments

General corrosion resistance: Good resistance to atmospheric corrosion, freshwater, and steam, ensuring durability in industrial settings

Wet corrosion: Resistant to mild acids and alkaline solutions at ambient temperatures, though primarily designed for high-temperature dry corrosion resistance

Scale adherence: The oxide layer formed at high temperatures adheres strongly to the alloy surface, preventing spallation during thermal cycling

Physical Properties:

Density: 8.1 g/cm³ (0.292 lb/in³)

Thermal conductivity: 15.0 W/(m·K) at 20°C (68°F), increasing to 28.0 W/(m·K) at 1000°C (1832°F)

Melting point: 1370-1425°C (2500-2597°F)

Coefficient of thermal expansion: 16.0 μm/(m·K) (20-100°C), rising to 21.0 μm/(m·K) at 1000°C (1832°F)

Modulus of elasticity: 200 GPa (29,000 ksi) at room temperature, decreasing to 140 GPa (20,300 ksi) at 1000°C (1832°F)

Product Forms

Alloy 330 (Incoloy 330) is manufactured in a diverse range of forms to accommodate specialized high-temperature industrial processes across heat treatment, aerospace, and power generation sectors:

Bar: Available as Round bar (diameters from 8 mm to 300 mm) and Flat bar (thickness 6 mm to 150 mm, width 20 mm to 600 mm), ideal for machining into furnace components, fasteners, and high-temperature hardware.

Ribbon: Thin, flat strips (thickness 0.1 mm to 2 mm, width 5 mm to 100 mm) used in electrical heating elements, furnace seals, and thermocouple protection sleeves.

Wire: Incoloy 330 Wire (diameters 0.05 mm to 10 mm) offers excellent flexibility and high-temperature stability, making it suitable for heating coils, thermocouple leads, and woven mesh in furnace applications.

Rods: Solid cylindrical rods (diameters 3 mm to 50 mm) suitable for structural supports in industrial furnaces, kilns, and high-temperature machinery.

Tube and Pipe: Seamless and welded options (outer diameter 6 mm to 200 mm, wall thickness 0.5 mm to 20 mm) for transporting hot gases, including flue gases and combustion products, in industrial heating systems.

Foil: Ultra-thin sheets (thickness 0.01 mm to 0.1 mm) used in lightweight thermal barriers, furnace liners, and precision components in high-temperature instruments.

Plate and Sheet: Flat forms (plate: thickness 5 mm to 100 mm; sheet: 0.3 mm to 5 mm) for fabricating furnace walls, heat exchanger panels, and kiln liners.

Strip: Narrow, flat strips (thickness 0.1 mm to 3 mm, width 10 mm to 200 mm) for precision manufacturing in heating elements, springs, and seals for high-temperature equipment.

Forging Stock: Billets and ingots for hot forging into complex shapes such as furnace door components, valve bodies, and aerospace heat shields.

Applications

The exceptional high-temperature and oxidation resistance properties of Alloy 330 (Incoloy 330 Wire) across its various forms make it a critical material in industries requiring performance in extreme heat environments:

Heat Treatment and Industrial Furnaces:

Furnace components: Liners, baskets, trays, and rails (from plate, sheet, and bar) for annealing, brazing, and sintering furnaces, withstanding continuous exposure to high temperatures.

Heating elements: Coils and ribbons (from wire and ribbon) for electric furnaces, leveraging high-temperature oxidation resistance.

Thermocouple protection: Sleeves and leads (from wire and tube) for temperature measurement in furnaces, ensuring accurate readings in harsh environments.

Aerospace and Aviation:

Exhaust systems: Components such as exhaust liners and heat shields (from sheet and plate) for jet engines, resisting high-temperature oxidation and thermal shock.

Aerospace furnaces: Parts for ground-based aerospace component heat treatment, including baskets and fixtures (from wire mesh and bar).

Rocket test facilities: Structural components for high-temperature test chambers (from plate and forging stock) exposed to extreme heat during engine testing.

Power Generation:

Boiler components: Superheater and reheater supports (from bar and rod) in fossil fuel power plants, resisting sulfidation and oxidation.

Waste incineration: Liners and ash handling components (from plate and tube) for waste-to-energy plants, withstanding corrosive high-temperature environments.

Gas turbine exhaust: Transition pieces and ducting (from sheet and plate) for industrial gas turbines, handling hot exhaust gases.

Metallurgical Processing:

Annealing equipment: Rolls and fixtures (from bar and forging stock) for annealing steel and other metals at high temperatures.

Molten metal handling: Components for handling molten metals, such as crucible supports (from bar and rod), resisting heat and minor metal splash.

Galvanizing lines: Parts exposed to high temperatures during zinc coating processes (from sheet and strip), resisting oxidation and zinc attack.

Specialized Applications by Form:

Wire: Heating coils in industrial furnaces, thermocouple leads, and woven mesh baskets for heat treatment.

Tube/Pipe: Exhaust gas ducts, thermocouple protection tubes, and hot gas transport lines.

Plate/Sheet: Furnace liners, heat shields, and large structural components in high-temperature systems.

Bar/Forging Stock: Furnace rails, fasteners, and custom-shaped components for industrial heating equipment.

In summary, Alloy 330 (Incoloy 330 Wire) — available in forms from Bar and Wire to Plate and Forging Stock — delivers exceptional high-temperature oxidation resistance, thermal shock resistance, and formability. Its diverse product forms enable tailored solutions across heat treatment, aerospace, and power generation sectors, establishing it as a critical material in extreme heat industrial 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 2711 gallon liquid totes Special package is available on request.