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
NiCr15Fe7TiAl is the EN symbol designation for a precipitation-hardenable nickel-chromium superalloy offering high strength and excellent corrosion and oxidation resistance over a wide temperature range. This datasheet presents the material within the EN symbol designation system.
Essentially a corrosion- and oxidation-resistant nickel-chromium base made precipitation-hardenable by additions of aluminium and titanium, NiCr15Fe7TiAl develops its strength from the gamma-prime (γ′, Ni₃(Al,Ti)) phase during ageing. It provides very high creep-rupture strength up to about 700 °C, with useful strength retained to higher temperatures, together with excellent cryogenic properties and good relaxation resistance for springs. It is used in the solution-treated and aged condition, the schedule chosen for the application.
Typical applications include gas-turbine components, high-temperature springs and fasteners, nuclear-reactor internals, bolts and aerospace hardware.
| Property | Value | Unit |
|---|---|---|
| Density | 8.28 | g/cm³ |
| Melting range | 1390–1430 | °C |
| Elastic modulus | 214 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 12.6 | µm/m·°C |
| Thermal conductivity (20 °C) | 12.0 | W/m·K |
| Specific heat (20 °C) | 431 | J/kg·K |
| Structure | Austenitic (FCC) | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | 70.0 | — | Base element; γ′ matrix |
| Chromium | Cr | 14.0 | 17.0 | Oxidation / corrosion resistance |
| Iron | Fe | 5.00 | 9.00 | Solid-solution element |
| Titanium | Ti | 2.25 | 2.75 | γ′ (Ni₃Ti) precipitation strengthening |
| Niobium | Nb (+Ta) | 0.70 | 1.20 | γ′ / carbide strengthening |
| Aluminium | Al | 0.40 | 1.00 | γ′ formation |
| Manganese | Mn | — | 1.00 | Deoxidiser |
| Silicon | Si | — | 0.50 | Deoxidiser |
| Carbon | C | — | 0.08 | Carbide formation |
| Cobalt | Co | — | 1.00 | Residual |
| Copper | Cu | — | 0.50 | Residual |
Solution-treated and aged condition, per EN reference data for W.Nr. 2.4669.
| Condition | Property | Value |
|---|---|---|
| Solution treated & aged | Tensile strength (Rm) | ≥1100 MPa |
| Solution treated & aged | 0.2% proof strength (Rp0.2) | ≥690 MPa |
| Solution treated & aged | Elongation (A5) | ≥20 % |
| Solution treated & aged | Reduction of area (Z) | ≥25 % |
| Solution treated & aged | Hardness | ~30–40 HRC |
Values per EN reference data; properties depend on the solution and ageing schedule. Confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| High-temperature oxidation | Excellent | Passivating chromium oxide |
| Aqueous / general | Good | Chromium-bearing |
| Steam / reactor water | Good | Note SCC risk in high-temperature pure water |
| Cryogenic | Excellent | Retains strength and toughness |
| Relaxation (springs) | Excellent | Maintains spring force at temperature |
Corrosion and oxidation resistance is good across a wide temperature range; in high-temperature pure water, attention must be given to intergranular stress-corrosion cracking and the appropriate heat treatment selected.
A γ′ precipitation-hardenable superalloy; strengthened by solution treatment followed by ageing. The schedule is chosen for the application.
Solution Treatment Solution anneal at approximately 1095–1150 °C (for maximum creep-rupture strength) or ~980 °C for spring and general grades, then cool.
Precipitation Hardening (Ageing) Age to precipitate γ′ (Ni₃(Al,Ti)) — for example a single age near 730 °C, or an equalised/double age (~885 °C then ~705 °C) for high-temperature service; spring tempers use ~650–730 °C.
Weldable by inert-gas processes; welding is generally done in the solution-annealed condition with post-weld solution and ageing. As a γ′ alloy it requires care to avoid strain-age cracking.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Acceptable | Matching or compatible filler |
| GMAW / MIG | Acceptable | Matching filler |
| Resistance / spot | Good | — |
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; spring tempers cold-coiled |
| Hot forming | Performed hot; solution and age afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Gas turbine | Blades, discs, rings, bolts | Strength + oxidation resistance |
| Springs / fasteners | High-temperature springs, bolts | Strength + relaxation resistance |
| Nuclear | Reactor internals, springs | Strength + controlled SCC behaviour |
| Aerospace / cryogenic | Hardware, cryogenic parts | Strength across temperature range |
| Product Form | DIN / EN Standard | Notes |
|---|---|---|
| Bar, rod and wire | DIN 17752 · W.Nr. 2.4669 | NiCr15Fe7TiAl |
| Sheet, strip and plate | DIN 17750 · W.Nr. 2.4669 | — |
| Forgings | DIN 17742 · W.Nr. 2.4669 | — |
| Inspection documents | EN 10204 | — |
Nickel-chromium precipitation-hardenable superalloy. W.Nr. 2.4669 (NiCr15Fe7TiAl).
| EN Symbol | Ni % | Cr % | Strengthening | Best Used For |
|---|---|---|---|---|
| NiCr15Fe7TiAl | ≥70 | 14–17 | γ′ (Al, Ti) | Springs, bolts, fasteners; corrosion + high strength to ~700 °C |
| NiCr15Fe | ≥72 | 14–17 | Solid solution | General-purpose Ni-Cr-Fe alloy (600, X-750 base) |
| NiCr19Fe19Nb5Mo3 | 50–55 | 17–21 | γ′ + γ″ (Nb, Ti) | Most-used high-strength superalloy (718) |
| NiCr20Co18Ti | Balance | 18–21 | γ′ (Al, Ti) | Gas-turbine blades and rings (Nimonic 90) |
| NiCr15Fe7TiAl (751) | ≥70 | 14–17 | γ′ (Al, Ti) | Higher-Ti X-750 variant; exhaust valves (751) |
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