Alloy 700，Inconel 700 ，

British Specs:，American Specs:，German Specs:

Alloy 700 and Inconel 700 Wire - Introduction with Composition, Properties, Applications and Product Forms

Alloy 700, commercially designated as Inconel 700, is a nickel-chromium-based superalloy celebrated for its outstanding high-temperature mechanical strength, reliable oxidation resistance, and consistent performance in harsh operational environments. This adaptable material is supplied in an extensive range of forms to address diverse industrial needs, including Bar (Round bar, Flat bar), Ribbon, Wire, Rods, Tube, Pipe, Foil, Plate, Sheet, Strip, and Forging Stock. Inconel 700 Wire, with its inherent flexibility, is especially well-suited for intricate high-temperature applications where precision and formability are paramount. Below is a comprehensive analysis of its chemical composition, key properties, practical applications, and available product forms.

Chemical Composition

The meticulously balanced chemical composition of Alloy 700 (Inconel 700) is the cornerstone of its superior performance in high-temperature settings. The typical composition (by weight) is as follows:

Nickel (Ni): 68-72% (acts as the primary matrix element, delivering a stable foundation for high-temperature operations and inherent corrosion resistance)

Chromium (Cr): 15-18% (a critical component for oxidation resistance, forming a protective chromium oxide layer at elevated temperatures to prevent material degradation)

Cobalt (Co): 7-10% (enhances high-temperature strength and creep resistance, contributing significantly to the alloy's durability under sustained mechanical stress)

Molybdenum (Mo): 2-3% (improves the alloy's overall strength and enhances resistance to creep deformation at high temperatures)

Titanium (Ti): 1.5-2.5% (facilitates precipitation hardening by forming intermetallic phases that boost the alloy's mechanical properties)

Aluminum (Al): 0.5-1.5% (works synergistically with titanium to promote precipitation strengthening, thereby enhancing high-temperature stability)

Carbon (C): 0.05-0.10% (forms carbides at grain boundaries, improving the alloy's creep resistance and overall structural integrity)

Silicon (Si): ≤ 0.5% (assists in the formation of a stable oxide layer, further enhancing oxidation resistance in high-temperature environments)

Manganese (Mn): ≤ 0.5% (aids in the manufacturing process by improving deoxidation and enhancing fabricability)

Trace elements: Sulfur (S) ≤ 0.015%, Phosphorus (P) ≤ 0.02% (strictly controlled to ensure good weldability and maintain grain boundary strength)

This harmonious composition collectively delivers the alloy's distinctive combination of high-temperature strength, oxidation resistance, and formability.

Key Properties

Alloy 700 and its various forms, including Inconel 700 Wire, exhibit a set of impressive properties that make them highly suitable for high-temperature applications:

Mechanical Properties (room temperature, heat-treated condition):

Tensile strength: 1100-1300 MPa (159,500-188,500 psi)

Yield strength (0.2% offset): 750-900 MPa (108,800-130,500 psi)

Elongation (in 50 mm): 12-18% (providing adequate ductility for fabrication into complex components)

Hardness: 32-38 HRC (indicating high strength and good wear resistance)

High-Temperature Performance:

Thermal stability: Maintains significant mechanical strength up to 900°C (1652°F), with tensile strength remaining above 500 MPa at 800°C (1472°F)

Oxidation resistance: Demonstrates good resistance to oxidation in air and combustion gases up to 1000°C (1832°F), forming a protective oxide layer that slows down material degradation

Creep resistance: Exhibits excellent creep resistance at temperatures ranging from 650°C to 850°C (1202°F to 1562°F), making it suitable for long-term service under sustained high-temperature stress

Corrosion Resistance:

Good resistance to high-temperature oxidation and sulfidation, making it suitable for use in furnace environments and combustion systems

Moderate resistance to aqueous corrosion in mild industrial environments, including freshwater and certain chemical solutions

Resists stress corrosion cracking in specific high-temperature, high-pressure environments

Physical Properties:

Density: 8.2 g/cm³ (0.296 lb/in³)

Thermal conductivity: 14 W/(m·K) at 20°C (68°F), increasing to 22 W/(m·K) at 900°C (1652°F)

Melting point: 1370-1410°C (2500-2570°F)

Coefficient of thermal expansion: 12.5 μm/(m·K) (20-100°C), rising to 17.0 μm/(m·K) at 900°C (1652°F)

Modulus of elasticity: 205 GPa (29,700 ksi) at room temperature, decreasing to 165 GPa (23,900 ksi) at 900°C (1652°F)

Product Forms

Alloy 700 is produced in a diverse range of forms to cater to various industrial processes and application needs:

Bar: Available as Round bar (diameters from 10 mm to 300 mm) and Flat bar (thickness 8 mm to 150 mm, width 25 mm to 600 mm), ideal for machining into high-temperature fasteners, gears, and structural components.

Ribbon: Thin, flat strips (thickness 0.2 mm to 3 mm, width 10 mm to 150 mm) used in electrical heating elements and thermal insulation applications.

Wire: Inconel 700 Wire (diameters 0.1 mm to 12 mm) offers excellent flexibility for forming high-temperature springs, thermocouple sheaths, and woven mesh for filtration.

Rods: Solid cylindrical rods (diameters 5 mm to 60 mm) suitable for structural supports and small-scale high-temperature parts.

Tube and Pipe: Seamless and welded options (outer diameter 8 mm to 250 mm, wall thickness 0.8 mm to 25 mm) for high-temperature fluid transport in industrial and aerospace systems.

Foil: Ultra-thin sheets (thickness 0.02 mm to 0.15 mm) used in lightweight thermal barriers and precision electronic components.

Plate and Sheet: Flat forms (plate: thickness 6 mm to 120 mm; sheet: 0.4 mm to 6 mm) for fabricating furnace liners, engine casings, and aerospace structural parts.

Strip: Narrow, flat strips (thickness 0.3 mm to 4 mm, width 15 mm to 250 mm) for precision manufacturing in high-temperature machinery.

Forging Stock: Billets and ingots for hot forging into complex shapes such as turbine disks, blades, and other critical aerospace components.

Applications

The exceptional properties of Alloy 700 across its various forms make it a preferred choice in industries that demand reliable performance under high-temperature and high-stress conditions:

Aerospace and Aviation:

Gas turbine engines: Forging stock shaped into turbine blades, vanes, and disks; bars machined into compressor components, leveraging high-temperature strength and creep resistance.

Jet engine parts: Tubes and pipes for fuel and coolant lines; sheets for combustion chamber liners; wire for high-temperature seals and gaskets.

Aircraft structural components: Plates and bars used in high-temperature zones of aircraft, such as exhaust systems.

Power Generation:

Gas and steam turbines: Forged components like turbine wheels; tubes for heat exchangers; bars for valve stems, withstanding high temperatures and pressure.

Nuclear power plants: Pipes for coolant systems; plates for reactor internals, resisting radiation and corrosion in high-temperature environments.

Industrial Processing:

High-temperature furnaces: Plates and sheets for furnace liners; tubes for heating element enclosures; ribbon for heating elements, enduring continuous exposure to high heat.

Petrochemical and chemical industries: Pipes and tubes for catalytic reactors; bars for valve components; wire mesh for high-temperature filtration, resisting corrosion and oxidation.

Specialized Applications by Form:

Wire: Thermocouple sheaths in industrial furnaces, high-temperature springs in aerospace systems, and woven filters in chemical processing.

Tube/Pipe: High-temperature fluid transport in gas turbines, heat exchanger tubes in power plants, and process piping in petrochemical refineries.

Plate/Sheet: Structural components in aerospace engines, furnace walls in industrial heat treatment, and radiation shields in nuclear applications.

Bar/Rod: Machined parts like turbine blades, fasteners, and gears in high-temperature machinery.

In summary, Alloy 700 (Inconel 700) — available in forms from Bar and Wire to Plate and Forging Stock — offers exceptional high-temperature strength, creep resistance, and oxidation resistance. Its diverse product forms enable tailored solutions across aerospace, power generation, and industrial processing sectors, establishing it as a crucial material in high-performance engineering 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 2963 gallon liquid totes Special package is available on request.