Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
Inconel 725 is an age-hardenable nickel-chromium-molybdenum-niobium alloy combining very high strength with outstanding corrosion resistance. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
Inconel 725 has essentially the same corrosion resistance as the widely used alloy 625, but is age-hardenable to develop strength of the order of twice that of annealed alloy 625. High nickel and chromium give resistance in both reducing and oxidizing environments, while the substantial molybdenum content provides strong resistance to pitting and crevice corrosion, and the niobium and titanium drive the γ″ (and γ′) precipitation that strengthens the alloy. Because the strength is developed by heat treatment rather than cold work, ductility and toughness remain high and strength can be imparted to large or non-uniform sections. The alloy resists hydrogen embrittlement and stress-corrosion cracking and is supplied in the solution-annealed and aged condition.
Typical applications include downhole sour-gas equipment — hangers, landing nipples, side-pocket mandrels and polished bore receptacles — and high-strength fasteners and components for marine and subsea service.
| Property | Value | Unit |
|---|---|---|
| Density | 8.31 | g/cm³ |
| Melting range | 1271–1343 | °C |
| Elastic modulus | 204 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 12.8 | µm/m·°C |
| Thermal conductivity (20 °C) | 9.4 | W/m·K |
| Specific heat (20 °C) | 435 | J/kg·K |
| Structure | Austenitic (FCC) | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | 55.0 | 59.0 | Austenite former; γ′/γ″ matrix |
| Chromium | Cr | 19.0 | 22.5 | Pitting / oxidation resistance |
| Molybdenum | Mo | 7.00 | 9.50 | Pitting / crevice / reducing-acid resistance |
| Niobium | Nb (+Ta) | 2.75 | 4.00 | γ″ (Ni₃Nb) precipitation strengthening |
| Titanium | Ti | 1.00 | 1.70 | γ′ (Ni₃Ti) precipitation strengthening |
| Iron | Fe | — | Balance | Solid-solution element (~9%) |
| Aluminium | Al | — | 0.35 | γ′ formation |
| Manganese | Mn | — | 0.35 | Deoxidiser |
| Silicon | Si | — | 0.20 | Deoxidiser |
| Carbon | C | — | 0.03 | Residual |
Solution-annealed and aged condition, typical values for UNS N07725 (120 ksi minimum yield grade).
| Condition | Property | Value |
|---|---|---|
| Solution annealed & aged | Tensile strength (UTS) | ≥1240 MPa (180 ksi) |
| Solution annealed & aged | 0.2% yield strength | ≥827 MPa (120 ksi) |
| Solution annealed & aged | Elongation at break | ≥20 % |
| Solution annealed & aged | Reduction of area | ≥40 % |
| Solution annealed & aged | Hardness | ≤43 HRC |
Confirm against the mill test report. Aged strength is of the order of twice that of annealed alloy 625.
| Environment | Performance | Notes |
|---|---|---|
| Sour gas (H₂S / CO₂ / chlorides) | Excellent | Qualified to NACE MR0175 / ISO 15156 |
| Chlorides (pitting / crevice) | Excellent | High Cr + Mo; 625-level resistance |
| Reducing acids | Excellent | Molybdenum-bearing |
| Seawater | Excellent | Resists pitting and crevice attack |
| Stress-corrosion cracking / hydrogen | Very Good | Resistant in sour / chloride media |
The alloy delivers corrosion resistance essentially equal to alloy 625 together with roughly double the strength, making it a leading choice for high-strength sour-service oilfield hardware.
An age-hardenable corrosion-resistant alloy; strengthened by solution annealing followed by ageing.
Solution Treatment Solution anneal at approximately 1040 °C (1900 °F) and air cool.
Precipitation Hardening (Ageing) For sour-service product, age at approximately 730 °C (1350 °F) / 8 h, furnace cool at ~56 °C/h to about 620 °C (1150 °F) / 8 h, air cool — a dual age that precipitates γ″ (Ni₃Nb) and γ′ to develop strength while preserving toughness and corrosion resistance.
Good weldability; welding is performed in the solution-annealed condition with post-weld ageing. The matching welding product is INCO-WELD Filler Metal 725NDUR, a higher-strength alternative to alloy 625 wire. GTAW and GMAW are preferred.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | Filler Metal 725NDUR |
| GMAW / MIG | Good | Filler Metal 725NDUR (≤180 A standard) |
| EBW / laser | Good | Autogenous or matching filler |
Weld in the solution-annealed condition; apply post-weld solution and ageing to develop properties.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Preferred condition | Solution-annealed for machining, then age |
| Machinability | Difficult; rigid setups, carbide tooling, slow speeds |
| Coolant | Ample coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | In the annealed condition; work-hardens rapidly |
| Hot forming | Readily forged; solution and age afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Oil & gas (downhole) | Hangers, landing nipples, side-pocket mandrels | Strength + sour-service corrosion resistance |
| Subsea | Fasteners, mandrels, polished bore receptacles | Strength + seawater / H₂S resistance |
| Marine | High-strength fasteners | Pitting / crevice resistance |
| Wellhead | Completion and production equipment | NACE MR0175 compliance |
| Product Form | ASTM Standard | ASME / Other |
|---|---|---|
| Bar and wire | ASTM B805 | ASME Code Case 2217 |
| Bar and forging stock | SMC Spec HA91 | ASME Code Case 2217 |
| Sour-service qualification | NACE MR0175 / ISO 15156 | — |
| Material designation | UNS N07725 | FMC Spec M40504 |
Nickel-chromium-molybdenum-niobium age-hardenable corrosion-resistant alloy. UNS N07725.
| Alloy | Cr % | Mo % | Strengthening | Best Used For |
|---|---|---|---|---|
| Inconel 725 | 19–22.5 | 7–9.5 | γ′ + γ″ (Nb, Ti) | Age-hardened 625; high strength + sour-service corrosion resistance |
| Inconel 716 | 19–22 | 7–9.5 | γ′ + γ″ (Nb, Ti) | Closely related age-hardened 625 derivative (625+) |
| Inconel 625 | 20–23 | 8–10 | Solid solution | Corrosion-resistant base alloy (annealed) |
| Inconel 718 | 17–21 | 2.8–3.3 | γ′ + γ″ (Nb, Ti) | High-strength workhorse superalloy |
| Inconel 925 | 19.5–23.5 | 2.5–3.5 | γ′ (Ti, Al) | Moderate-strength sour-service alloy |
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