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
N07716 is a precipitation-hardenable nickel-chromium-molybdenum superalloy developed for high-strength service in severely corrosive oil-and-gas environments. This datasheet presents the material within the American (ASTM / API / UNS) standard system.
Also known as alloy 625 Plus (625+), N07716 is an age-hardenable derivative of the corrosion-resistant alloy 625: a titanium addition allows strengthening through γ′ and γ″ precipitation while the high chromium and molybdenum content preserves the outstanding pitting, crevice and chloride resistance of the 625 base. The result combines strength approaching that of alloy 718 with corrosion resistance comparable to alloy 625. It is closely related to, and largely interchangeable with, alloy 725. Because its strength is developed by heat treatment rather than cold work, ductility and toughness remain high. It is qualified for sour service under NACE MR0175 / ISO 15156 and is supplied in the solution-annealed and aged condition.
Typical applications include downhole and wellhead components — hangers, packers, landing nipples and safety valves — high-strength fasteners and connectors for subsea production systems, and flanges and couplings for high-pressure sour-gas service.
| Property | Value | Unit |
|---|---|---|
| Density | 8.32 | g/cm³ |
| Melting range | 1300–1370 | °C |
| Elastic modulus | 204 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 13.0 | µm/m·°C |
| Thermal conductivity (20 °C) | 9.6 | W/m·K |
| Specific heat (20 °C) | 435 | J/kg·K |
| Structure | Austenitic (FCC) | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | 59.0 | 63.0 | Austenite former; γ′/γ″ matrix |
| Chromium | Cr | 19.0 | 22.0 | Pitting / oxidation resistance |
| Molybdenum | Mo | 7.0 | 9.5 | Pitting / crevice / reducing-acid resistance |
| Niobium | Nb | 2.75 | 4.00 | γ″ (Ni₃Nb) precipitation strengthening |
| Titanium | Ti | 1.00 | 1.60 | γ′ (Ni₃Ti) precipitation strengthening |
| Iron | Fe | — | Balance | Solid-solution element |
| Aluminium | Al | — | 0.35 | γ′ formation |
| Manganese | Mn | — | 0.20 | Deoxidiser |
| Silicon | Si | — | 0.20 | Deoxidiser |
| Carbon | C | — | 0.03 | Residual |
Solution-annealed and aged condition, typical values for UNS N07716 (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 | ≥855 MPa (120 ksi) |
| Solution annealed & aged | Elongation at break | ≥20 % |
| Solution annealed & aged | Reduction of area | ≥40 % |
| Solution annealed & aged | Hardness | ≤40 HRC |
Confirm against the mill test report. The hardness limit and microstructure are controlled for sour-service qualification.
| Environment | Performance | Notes |
|---|---|---|
| Chlorides (pitting / crevice) | Excellent | High Cr + Mo; 625-level resistance |
| Sour gas (H₂S / CO₂) | Excellent | Qualified to NACE MR0175 / ISO 15156 |
| Reducing acids | Excellent | Molybdenum-bearing |
| Seawater | Excellent | Resists pitting and crevice attack |
| Stress-corrosion cracking | Very Good | Resistant in chloride / sour media |
The alloy delivers corrosion resistance comparable to alloy 625 together with high strength. Note that, in common with related precipitation-hardened nickel alloys, heat treatment must be controlled to avoid detrimental grain-boundary phases that can reduce resistance to hydrogen stress cracking under cathodic protection.
A precipitation-hardenable superalloy; strengthened by solution annealing followed by ageing. Heat treatment must be carefully controlled to avoid intergranular η and δ phases.
Solution Treatment Solution anneal at approximately 1010–1040 °C and cool (typically air or faster) to retain a clean solid solution.
Precipitation Hardening (Ageing) Age at approximately 730–760 °C for several hours and air cool, precipitating γ′ (Ni₃Ti) and γ″ (Ni₃Nb). A single-step age is common for sour-service product; the schedule is controlled to meet the strength and hardness limits while avoiding grain-boundary phases.
Weldable by inert-gas processes; welding is performed in the solution-annealed condition with post-weld solution and ageing to develop properties. Matching or alloy 625/725-type fillers are used.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | Matching or alloy 625-type filler |
| GMAW / MIG | Good | Matching filler |
| EBW / laser | Good | Autogenous or matching filler |
Weld in the solution-annealed condition; apply post-weld solution and ageing treatment to restore 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, packers, landing nipples, safety valves | Strength + sour-service corrosion resistance |
| Subsea | Fasteners, connectors, structural components | Strength + seawater / H₂S resistance |
| High-pressure service | Flanges, couplings, connection components | Strength to high pressure ratings |
| Wellhead | Wellhead and completion equipment | API 6A compliance |
| Product Form | Standard | Notes |
|---|---|---|
| Forged bar and stock | API 6A / 6ACRA | UNS N07716 |
| Round bar | UNS N07716 | 120 ksi minimum yield grade |
| Sour-service qualification | NACE MR0175 / ISO 15156 | — |
| Material designation | UNS N07716 | Alloy 625 Plus (625+) |
Nickel-chromium-molybdenum precipitation-hardenable superalloy. UNS N07716.
| UNS | Cr % | Mo % | Strengthening | Best Used For |
|---|---|---|---|---|
| N07716 | 19–22 | 7–9.5 | γ′ + γ″ (Nb, Ti) | Age-hardened 625 (625+); high strength + sour-service corrosion resistance |
| N07725 | 19–22.5 | 7–9.5 | γ′ + γ″ (Nb, Ti) | Closely related age-hardened 625 derivative (725) |
| N06625 | 20–23 | 8–10 | Solid solution | Corrosion-resistant base alloy, annealed (625) |
| N07718 | 17–21 | 2.8–3.3 | γ′ + γ″ (Nb, Ti) | High-strength workhorse superalloy (718) |
| N09925 | 19.5–23.5 | 2.5–3.5 | γ′ (Ti, Al) | Moderate-strength sour-service alloy (925) |
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