Inconel 725
Alloy: Inconel 725 (UNS N07725)
Form: Bar, Wire, Forging, Plate, Tubing
Condition: Annealed, Aged (Solution Treated & Precipitation Hardened)
Size Range: Custom sizes available
Certification:ISO 9001, SGS test report, material certificate (MTC)
BAOHUI STEEL supplies Inconel 725 (UNS N07725), a precipitation-hardenable nickel-chromium-molybdenum-niobium alloy designed for extreme service conditions in corrosive oil and gas environments. This alloy offers exceptional resistance to sulfide stress cracking, chloride-induced stress corrosion cracking, and pitting corrosion while achieving very high strength levels through age-hardening treatment. Its optimized composition makes it particularly suitable for critical components in sour well applications.
Key Features
Exceptional Corrosion Resistance
Outstanding performance in H₂S, CO₂, and chloride environments
Very High Strength
Achieves up to 1100 MPa yield strength after aging
Excellent Sulfide Stress Cracking Resistance
Superior to most nickel alloys in sour service
Age-Hardenable
Can be precipitation hardened for maximum mechanical properties
Good Fabricability
Can be welded and formed using appropriate techniques
Long-Term Stability
Maintains properties in prolonged high-temperature service
Technical Specifications
|
Parameter |
Specification |
|
Standard |
ASTM B805, AMS 5959 |
|
Alloy |
Inconel 725 (UNS N07725) |
|
Form |
Bar, Wire, Forging, Plate, Tubing |
|
Condition |
Annealed, Aged (Solution Treated & Precipitation Hardened) |
|
Size Range |
Custom sizes available |
Chemical Composition (%)
|
Element |
Requirements |
Typical Value |
|
Nickel (Ni) |
55.0-59.0 |
57.0 |
|
Chromium (Cr) |
19.0-22.5 |
21.0 |
|
Molybdenum (Mo) |
7.0-9.5 |
8.0 |
|
Iron (Fe) |
5.0-9.0 |
7.0 |
|
Niobium (Nb) |
2.75-4.00 |
3.4 |
|
Titanium (Ti) |
1.00-1.70 |
1.5 |
|
Aluminum (Al) |
0.35 max |
0.2 |
|
Carbon (C) |
≤ 0.03 |
0.01 |
|
Manganese (Mn) |
≤ 0.35 |
0.2 |
|
Silicon (Si) |
≤ 0.20 |
0.1 |
Mechanical Properties
|
Property |
Annealed Condition |
Aged Condition |
|
Tensile Strength |
790-930 MPa |
1170-1380 MPa |
|
Yield Strength (0.2% Offset) |
380-550 MPa |
1030-1170 MPa |
|
Elongation |
30-40% |
15-25% |
|
Hardness (HB) |
200-250 |
330-400 |
Physical Properties
|
Property |
Value |
|
Density |
8.31 g/cm³ |
|
Melting Point |
1350-1400°C |
|
Electrical Resistivity |
128 μΩ·cm |
|
Thermal Conductivity |
10.8 W/m·K |
|
Coefficient of Thermal Expansion |
13.2 × 10⁻⁶/°C |
Heat Treatment
Solution Treatment
Temperature: 1020-1060°C
Rapid cooling (water quench)
Aging Treatment
Two-step aging process:
Primary aging: 730-750°C for 8 hours
Secondary aging: 620-650°C for 8 hours
Air cool after each step
Applications
Inconel 725 is almost exclusively used in the most demanding applications where other high-performance alloys fail.
Oil & Gas Industry
Wireline Cables & Logging Tools
Downhole Equipment
Production tubing, casing, packers, hangers, and valve components for ultra-deep, high-pressure/high-temperature (HPHT), and sour service wells.
Offshore
High-strength tie-down bolts, fasteners, and subsea components exposed to high chloride environments and stress.
Aerospace
High-stress fasteners and critical engine components.
Marine Engineering
Components for submarines and high-performance propulsion systems.
Comparison with Similar Alloys
|
Property |
Inconel 725 |
Inconel 925 |
Inconel 718 |
Inconel 625 |
|
Primary Strengthening Mechanism |
γ' + γ'' Precipitation Hardening |
γ' Precipitation Hardening |
γ'' Precipitation Hardening |
Solid Solution (Mo, Nb) |
|
Typical Yield Strength |
Highest (~175+ ksi / 1200+ MPa) |
High (~120-150 ksi / 827-1034 MPa) |
High (~130-150 ksi / 896-1034 MPa) |
Moderate (~60-80 ksi / 414-552 MPa) |
|
SSC Resistance |
Superior (NACE Region 3) |
Excellent |
Good (with restrictions) |
Good (with restrictions) |
|
Relative Cost |
Highest |
High |
Moderate-High |
Moderate |
Request a Quote Now
Benefits of contacting us now:
Free Inconel 725 sample (with full test report)
24-hour quote response
Customized technical proposal
Volume discounts (10
% off for orders ≥500kg)
WhatsApp: 8613468954786
Email:baohui@bhsteelpipe.com
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