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
NiCr25FeAlY is a high-carbon nickel–chromium–iron alloy with deliberate additions of aluminium (1.8–2.4%) and the reactive elements yttrium and zirconium. The "CA" denotes its defining metallurgy: a self-healing alumina (Al₂O₃) surface layer combined with grain-boundary reinforcement by stable chromium carbides (M₂₃C₆ / M₇C₃). This datasheet presents the material within the European (DIN / EN / Werkstoff-Nummer) standard system.
It is among the most oxidation-resistant and creep-resistant wrought nickel alloys commercially available, with excellent service capability up to 1200 °C (2192 °F) even under cyclic heating and cooling. The tightly adhering alumina scale resists spalling, giving the alloy the lowest mass loss under cyclic oxidation of common high-temperature materials. The high carbon content and carbide precipitation give outstanding high-temperature creep strength.
The alloy is not age-hardened in the conventional sense; it is supplied solution-annealed (typically at 1220 °C to develop a coarse grain size ≥70 µm for maximum creep strength). It offers very good resistance in carburising and oxidising/chlorinating media and good resistance in sulphur-containing oxidising atmospheres. Note: solution-annealed material is sensitive to stress-relaxation cracking between 600–750 °C and should be stabilisation-annealed for long-term service in that range.
Values per VDM Metals official Material Data Sheet No. 4137 (Rev. 04, 2022), solution-annealed condition.
| Property | Value | Unit |
|---|---|---|
| Density (25 °C) | 7.93 | g/cm³ |
| Melting range | 1340–1400 | °C |
| Elastic modulus (20 °C) | 215 | GPa |
| Thermal conductivity (20 °C) | 10.4 | W/m·K |
| Coefficient of thermal expansion (20–100 °C) | 14.15 | µm/m·°C |
| Specific heat capacity (20 °C) | 447 | J/kg·K |
| Electrical resistivity (20 °C) | 1.23 | µΩ·m |
| Magnetic permeability (20 °C) | 1.01 max | Essentially non-magnetic |
| Maximum service temperature (oxidation) | ~1200 | °C |
| Crystal structure | Face-centred cubic (FCC) | — |
Composition per EN 10302 (W.Nr. 2.4633, NiCr25FeAlY).
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance | — | Austenitic FCC matrix |
| Chromium | Cr | 24.0 | 26.0 | Oxidation resistance |
| Iron | Fe | 8.0 | 11.0 | Balance element |
| Aluminium | Al | 1.8 | 2.4 | Oxidation resistance (alumina-forming) |
| Carbon | C | 0.15 | 0.25 | Carbide strengthening (creep) |
| Titanium | Ti | 0.1 | 0.2 | Carbide former |
| Zirconium | Zr | 0.01 | 0.1 | Grain-boundary strengthening |
| Yttrium | Y | 0.05 | 0.12 | Oxide-scale adherence (rare earth) |
| Silicon | Si | — | 0.5 | Deoxidiser |
| Manganese | Mn | — | 0.5 | Deoxidiser |
| Copper | Cu | — | 0.1 | Residual |
| Phosphorus | P | — | 0.02 | Residual impurity |
| Sulphur | S | — | 0.01 | Residual impurity |
Nominal: Ni-25Cr-9.5Fe-2Al-Y. The high carbon (0.15-0.25%), aluminium and yttrium give exceptional creep strength and oxidation resistance to ~1200 °C.
Solution-annealed (+AT) condition, per EN 10302 for W.Nr. 2.4633.
| Property | Value | Unit |
|---|---|---|
| Tensile strength (Rm) | ≥680 | MPa |
| 0.2% proof strength (Rp0.2) | ≥270 | MPa |
| Elongation at fracture (A) | ≥30 | % |
Values per EN 10302 (creep-resisting alloys). Confirm against the inspection certificate (EN 10204).
Typical long-term creep values, solution-annealed (1220 °C), per VDM Material Data Sheet No. 4137.
| Temperature | Creep strength Rm/10⁴ h | Creep strength Rm/10⁵ h |
|---|---|---|
| 650 °C | 215 MPa | 140 MPa |
| 700 °C | 155 MPa | 100 MPa |
| 800 °C | 42 MPa | 20 MPa |
| 900 °C | 18 MPa | 9.7 MPa |
| 1000 °C | 9.0 MPa | 4.5 MPa |
| 1100 °C | 4.4 MPa | 2.1 MPa |
| 1200 °C | 2.2 MPa | 0.8 MPa |
The outstanding creep strength derives from primary M₂₃C₆ / M₇C₃ carbide precipitation, which is the primary reason for selecting this alloy over Alloy 600 / 601 in load-bearing furnace components above 1000 °C.
| Environment | Performance | Notes |
|---|---|---|
| High-temperature oxidation (air) | Outstanding | Adherent Al₂O₃ scale; service to 1200 °C; better than Alloy 601 across the whole range |
| Cyclic oxidation | Outstanding | Lowest mass loss of common high-temperature alloys under cyclic stress |
| Carburisation | Excellent | High Cr + Al; better than Alloy 601 |
| Metal dusting | Very Good | Improved resistance vs Alloy 601 |
| Oxidising sulphur-containing atmospheres | Very Good | Cr + Al provide resistance at elevated temperature |
| Oxidising / chlorinating media | Very Good | Good resistance reported by manufacturer |
| Reducing, low-oxygen atmospheres | Limited | Alumina scale requires oxidising conditions to self-heal |
Supplied in the solution-annealed state. Not a conventional age-hardening alloy; strength derives from carbide precipitation and solution-annealed grain size.
Solution Anneal Temperature: 1220 °C Purpose: Develops coarse grain size (≥70 µm) for maximum creep strength. Retention time scales with section thickness; accelerated cooling (water or compressed air) if further processing follows.
Stabilisation Anneal Temperature: 950 °C, minimum 3 hours Purpose: Required before or after welding, and before long-term (>100 h) service in the 600–750 °C range, to prevent stress-relaxation cracking.
Hot working: 900–1200 °C, followed by rapid cooling; reheat if temperature falls below the lower limit. Post-forming heat treatment recommended.
Weldable by conventional processes (TIG, plasma, GMAW). Owing to lower thermal conductivity and higher thermal expansion than carbon steel, use root gaps of 1–3 mm and included angles of 60–70°. Interpass temperature should not exceed 120 °C; stringer-bead technique recommended.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Excellent | VDM FM 602 CA (W.Nr. 2.4649) / S Ni 6025 |
| Plasma | Excellent | S Ni 6025 (NiCr25Fe10AlY) |
| GMAW / MAG | Good | DIN EN ISO 18274 S Ni 6025; multicomponent shielding gas |
Stabilisation anneal at 950 °C may be required before/after welding for service in the 600–750 °C range. Preheating is generally not required.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Preferred condition | Solution-annealed |
| Work hardening | Higher than austenitic stainless; keep tool engaged at all times |
| Cutting speed | Low cutting speed, moderate feed; cut below the strain-hardened zone |
| Coolant | Ample water-based emulsion (as for stainless steels) |
Forming Processes
| Process | Notes |
|---|---|
| Hot forming | 900–1200 °C; rapid cool; reheat if below lower limit |
| Cold forming | Higher work hardening than stainless; intermediate/solution anneal if deformation >7% |
| Bending | Inner radius > 3× sheet thickness to avoid damage |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Thermal processing / heat treatment | Radiant tubes, furnace muffles, rotary and shaft furnaces, kiln rollers, furnace installations | Creep strength + cyclic oxidation resistance to 1200 °C |
| Chemical / petrochemical | Reformers, methanol and ammonia synthesis, hydrogen production | High-temperature strength + carburisation resistance |
| Power / energy | Components for E-fuel syngas cooling, high-temperature ducting | Creep and oxidation resistance |
| Automotive | Exhaust system components, diesel glow plugs | Cyclic oxidation resistance |
| Nuclear / waste | Glass pots for melting radioactive waste | Extreme-temperature stability |
| Product Form | DIN / EN Standard | VdTÜV |
|---|---|---|
| Rod, bar | DIN 17742 / 17752 · DIN EN 10302 | VdTÜV-Wb 540 |
| Sheet, plate | DIN 17742 / 17750 · DIN EN 10302 | VdTÜV-Wb 540 |
| Strip | DIN 17742 / 17750 · DIN EN 10302 | VdTÜV-Wb 540 |
| Wire | DIN 17742 | — |
| Welding consumable | DIN EN ISO 18274 S Ni 6025 | — |
VdTÜV material data sheet 540: pressure-vessel approval from –10 to 1150 °C.
| EN Symbol | Ni % | Cr % | Fe % | UTS (annealed) | Max Temp. | Best Used For |
|---|---|---|---|---|---|---|
| NiCr25FeAlY | bal | 24–26 | 8–11 | ≥675 MPa | ~1200 °C | Extreme oxidation + creep; furnace rolls, radiant tubes |
| NiCr23Fe | 58–63 | 21–25 | balance | ≥550 MPa | ~1250 °C(ox) | Cyclic oxidation; radiant tubes |
| NiCr15Fe | ≥72 | 14–17 | 6–10 | ~655 MPa | ~1095 °C | General high-temp; carburisation/nitriding |
| NiCr22Mo9Nb | ≥58 | 20–23 | ≤5 | ~830 MPa | ~980 °C | Universal corrosion resistance; seawater |
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