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Inconel 725 Nickel Alloy

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  • Inconel 725 Nickel Alloy
  • Inconel 725 Nickel Alloy
  • Inconel 725 Nickel Alloy
  • Inconel 725 Nickel Alloy
  • Inconel 725 Nickel Alloy

›

Inconel 725 Nickel Alloy
Phone : +86 13791102120
WhatsApp : +86 13791102120
Email : admin@dongtesteelgroup.com
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Product Description
Inconel 725 (UNS N07725) is a premium, age-hardenable nickel-chromium-molybdenum alloy specifically engineered to deliver exceptional strength and unparalleled corrosion resistance in the world's most challenging environments, particularly sour gas wells containing H₂S.

Unmatched Strength Through Age Hardening

Unlike many alloys that derive strength from cold working, Inconel 725 achieves its remarkable mechanical properties—approximately double the strength of annealed Alloy 625—through a precise thermal age-hardening treatment. This process precipitates the gamma double-prime (ϒ") phase throughout the microstructure.

This method offers critical advantages:

  • High Strength in Thick Sections: Achieves uniform, ultra-high strength throughout large, complex, or non-uniform components that cannot be strengthened by cold working.
  • Retained Ductility and Toughness: Unlike cold-worked materials, which can become brittle, age-hardened Alloy 725 maintains excellent ductility and impact resistance, essential for critical safety components like wellhead equipment.
  • Superior Stress Corrosion Cracking (SCC) Resistance: The combination of high strength and inherent corrosion resistance makes it highly resistant to SCC, a common failure mode in high-stress, corrosive environments.

Chemical Composition


CrNiMoCoNb (+Ta)TiWCuCMnNSiPSFeAl
Min19.0055.007.00
2.751.00









Max22.5059.009.50
4.001.70

0.030.35
0.200.0150.01Bal0.35

Mechanical Properties


Bars up to 3” (76mm) diameter or sectionBars greater than 10” (254mm) diameter or sectionBars greater than 10” (254mm) diameter or section
0.2% Proof Stress, min827 N/mm2120 ksi827 N/mm2120 ksi827 N/mm2120 ksi
Tensile strength, min1034 N/mm2150 ksi1034 N/mm2150 ksi1034 N/mm2150 ksi
Elongation, 5.65√S0 and 4D20%
20%
20%

Reduction of Area35%
35%
35%

Hardness (Rockwell C)<43
<43
<43

Impact Strength (-60oC) Longitudinal, Typical54J av (47J min)40 ft.lb av (35 ft.lb min)




Impact Strength (-60oC) Transverse, Typical

50J av (43J min)37 ft.lb av (32 ft.lb min)43J av (37J min)32 ft.lb av (27 ft.lb min)

Notes:

  1. Tensile testing shall be carried out in accordance with ASTM A370 or EN10002-1
  2. Minimum properties quoted (tested at room temperature in a longitudinal direction)
  3. Testing performed on each melt of material per heat treatment batch

Physical Properties

Density (Kg.m-1)8310
Magnetic Permeability (20°C)< 1.001
Young’s Modulus (kN/mm2)204
Poissons Ration0.31
Specific Heat, 20°C (J/(g.K))0.43
Electrical Resistivity, 20°C (µΩ-m)1.144
Thermal conductivity, 20°C (W/(m.K))10.6
Mean coefficient of thermal expansion, 20-100°C (/K)13 x 10-6

Key Specifications & Approvals

ASTM B637: Standard Specification for Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock for High-Temperature Service
UNS N07725
API 6CRA (725): Standard for Age-Hardened Nickel-Based Alloys for Corrosive and High-Temperature Service

Critical Applications Across Industries

The unique properties of Inconel 725 make it the material of choice for:
  • Oil & Gas Downhole Equipment: Tubing hangers, subsurface safety valves, mandrels, and connectors for sour service.
  • Fasteners:High-strength bolts, studs, and nuts for offshore platforms, subsea systems, and chemical reactors requiring corrosion resistance.
  • Valve Components: Valve stems, trim, and shafts in severe service.
  • Chemical Processing: Agitators, shafts, and components exposed to mixed acids and chlorides.
  • Marine Engineering: Critical components for seawater systems that demand high strength and resistance to pitting.
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