General Description

Inconel 725 (UNS N07725) is a nickel based alloy which is highly resistant to many aqueous environments and is age hardenable for extremely high strength. It has essentially the same corrosion resistance as Inconel 625, which is widely used in a broad range of severaly corrosive environments.

Inconel 725 is especially resistant to media containing carbon dioxide, chlorides, and hydrogen sulfide, such as those encountered in deep sour gas wells. In such environments, it resists general corrosion, pitting, sulfide stress cracking (hydrogen embrittlement), and stress-corrosion cracking. Inconel 725 also displays resistance to corrosion in brines and seawater.

Inconel 725 fills the need for greater environmental cracking resistance at high temperatures in deep, extremely hostile, oil and gas production environments. It offers better cracking resistance at elevated temperatures in higher levels of H2S due to the higher content of molybdenum.

Age-hardenable alloy 725 is used for hangers, landing nipples, side pocket mandrels, and polished bore receptacles in sour gas service. Also used for high-strength fasteners in marine applications. Its combined high strength and hardness make alloy 725 a suitable choice for polymer extrusion dies.

Chemical Composition

Grade Ni% Cr% Fe% Mo% Nb% Ti% Al% Mn% Si% P% C% S%
Inconel 725 55.0-59.0 19.0-22.5 Bal. 7.0-9.5 2.75-4.0 1.0-1.7 Max 0.35 Max 0.35 Max 0.20 Max 0.015 Max 0.03 Max 0.010


Grade UNS
Inconel 725 N07725

Physical Properties

Grade Density Melting Point
Inconel 725 8.31 g/cm3 1271°C-1343 °C

Mechanical Properties (Room temperature)

Form Condition Tensile Strength Yield Strength (0.2%) Elongation Hardness (HRC)
Round Age Hardened 1137 MPa 827 MPa 20% 35

Size Range

Inconel 725 Bar available

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