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Inconel 725 Nickel-chromium-molybdenum-niobium Alloy Forgings

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About alloy 725

Alloy 725 was developed from Alloy 625 by adding strengthening elements to enhance its mechanical properties. The properties of Nickel alloy 725 are useful for a wide range of applications that require outstanding corrosion resistance along with high strength. The alloy is used in sour gas service where it resists the effects of hydrogen sulfide, chlorides and carbon dioxide.

Alloy 725 is also attractive for high strength fasteners in marine applications, where it resists corrosion, pitting and crevice attack in sea water.

Chemical Composition of alloy inconel 725

Carbon (C): ≤ 0.03%

Silicon (Si): ≤ 0.50%

Manganese (Mn): ≤ 0.35%

Phosphorus (P): ≤ 0.015%

Sulfur (S): ≤ 0.015%

Nickel (Ni): 55.0~59.0%

Chromium (Cr): 19.00-22.5%

Molybdenum (Mo): 7.0-9.5%

Iron (Fe): surplus

Aluminum (Al): ≤ 0.35%

Titanium (Ti): 1.0~1.7%

Nb: 2.75-4.0%

Properties of alloy inconel 725

Density:8.31 g/cm³

Melting Range:1271 - 1343 °C

Hardness*:36 HRC

Specific Heat Capacity:J/kg.°C

Electrical Resistivity:1.144 µΩ.m

Poisson's Ratio:0.31

Features and applications of inconel 725 alloy forgings

A nickel-chromium-molybdenum-niobium aged hardenable grade, Alloy 725 has extremely high strength.

With addition of aluminium and titanium, Alloy 725 has high strength, ductility and toughness. In addition, the alloy has high corrosion resistance including resistance to hydrogen embrittlement and stress corrosion cracking.Used for pipe fittings, joints, and bearings in acid resistant equipment. It is also widely used in marine ship equipment.

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