Inconel high-temperature alloy

Inconel is a high-performance nickel-based superalloy known for its exceptional resistance to high temperatures, oxidation and corrosion. The alloy is primarily composed of nickel (Ni), chromium (Cr) and iron (Fe), making it indispensable in extreme conditions such as high temperatures, pressures and aggressive chemical environments. Unlike ordinary steel, although the melting point of steel may be higher than that of nickel, it will quickly lose strength and corrosion resistance at high temperatures; nickel-chromium iron alloys can still maintain excellent mechanical properties in a hot state and form a dense protective oxide layer to effectively resist high-temperature corrosion.

With excellent mechanical strength, thermal stability and durability, Inconel is widely used in aerospace, energy, chemical and marine engineering fields.

Inconel 625 – Inconel High-Temperature Alloy

Inconel 625 (GH3625) is a nickel-based high-temperature alloy solid-solution strengthened with the addition of molybdenum and niobium to improve its strength and corrosion resistance at high temperatures. The alloy exhibits excellent oxidation resistance and maintains excellent tensile and fatigue strength from cryogenic temperatures to 980°C. It is also extremely resistant to stress corrosion cracking in salt water environments, making it ideal for extreme industrial applications. Inconel 625 has good processability, weldability and plasticity, ensuring ease of component manufacturing. Jiangsu DZX Technology Co., Ltd. provides factory direct sales and ships from Jiangsu Province.

Nickel-Chromium-Molybdenum-Niobium Alloy

Inconel 625 – Inconel High-Temperature Alloy

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Inconel 625 is a solid solution strengthened nickel-based superalloy, reinforced with molybdenum and niobium for enhanced high-temperature strength and corrosion resistance. It exhibits exceptional oxidation resistance, maintaining excellent tensile and fatigue strength from cryogenic temperatures up to 980°C. The alloy also demonstrates superior resistance to stress corrosion in salt-laden environments, making it ideal for harsh industrial applications. Inconel 625 offers good workability, weldability, and formability, ensuring ease of fabrication.

Specifications

Plate / Sheet
Thickness: 0.5mm-100mm
Width: 500mm-2000mm
Length: 1000mm-6000mm
Rod
Diameter: 5mm-500mm
Length: 500mm-6000mm
Tube
Outer Diameter: 6mm-273mm
Wall Thickness: 0.5mm-50mm
Length: ≤ 12000mm
Wire
Diameter: 0.1mm-10mm
Delivery Forms: Coiled wire or straight wire

Chemical Composition

Nickel (Ni): Rest

Chromium (Cr): 20-23

Iron (Fe): ≤5.0

Carbon (C): ≤0.10

Manganese (Mn): ≤0.50

Silicon (Si): ≤0.50

Molybdenum (Mo): 8.0-10.0

Niobium (Nb)+ Tantalum (Ta): 3.15-4.15

Sulfur (S): ≤0.015

Cobalt (Co): ≤1.0

Aluminum (Al): ≤0.4

Titanium (Ti): ≤0.4

Physical & Mechanical Properties

Inconel 625	Solid Solution Strengthened
Tensile Strength (Rm N/mm²)	830
Yield Strength (Rp 0.2N/mm²)	410
Elongation at Break A5 (%)	30
Brinell Hardness (HB)	≤290
Thermal Conductivity λ (W/m·℃)	12.1
Specific Heat (J/kg·°C)	430
Electrical Resistivity (μΩ·m)	1.28
Coefficient of Lines Expansion (α×10⁻⁶/20~600ºC)	12.3
Density (g/cm³)	8.44
Melting Point (°C)	1290-1350°C

Supply Capability

Item	Details
Lead Time	Samples 5-10 days; production 15-30 days
MOQ	Small trial orders accepted
Samples	Available on request
Packaging	Export-standard coil spools / wooden cases
Certificate	COC with chemical composition analysis
Payment	T/T, L/C

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Frequently Asked Questions (FAQ)

What element is Inconel 625 strengthened by? What brand does it correspond to in China?

625 is solid solution strengthened by adding molybdenum 8.0-10.0% and niobium + tantalum 3.15-4.15%. Chromium 20-23%, iron ≤5%, and nickel are the balance. It corresponds to GH3625 in China. The combination of molybdenum and niobium allows it to have both strength and corrosion resistance at high temperatures, with a density of 8.44 g/cm³ and a melting point of 1290-1350°C, which is a high-strength grade within the group.

What is the wide temperature range over which Inconel 625 can be used?

How resistant is Inconel 625 to stress corrosion cracking in salt water environments?

When making heat exchange equipment, what are the thermal conductivity, expansion and other parameters of Inconel 625?

The thermal conductivity of 625 solid solution strengthened state is 12.1 W/m·℃, the specific heat capacity is 430 J/kg·°C, the resistivity is 1.28 Ω·m, the linear expansion coefficient is 12.3×10⁻⁶ at 20~600°C, the density is 8.44 g/cm³, and the melting point is 1290-1350°C. These parameters can be directly used for verification when designing heat exchanger tube bundles and high-temperature pipes.

In what situations is Inconel 625 (GH3625) usually used?

Typical applications are extreme industrial applications that require both high-temperature strength and corrosion resistance: aerospace high-temperature parts, chemical processing equipment, marine engineering components, heat exchangers, reactors, etc. Maintains tensile and fatigue strength from low temperatures to 980°C, resists stress corrosion cracking in salt water environments, and requires hassle-free processing and welding.

Inconel high-temperature alloy

Inconel 625 – Inconel High-Temperature Alloy

Nickel-Chromium-Molybdenum-Niobium Alloy

Inconel 625 – Inconel High-Temperature Alloy

Need this alloy for a demanding application?

Frequently Asked Questions (FAQ)

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