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
2.4952 is a wrought, age-hardenable nickel–chromium alloy strengthened by additions of titanium, aluminium and carbon, developed for high-strength service at temperatures up to 815 °C (1500 °F). This datasheet presents the material within the European (DIN / EN / Werkstoff-Nummer / BS) standard system.
It is essentially alloy 75 made precipitation-hardenable: titanium and aluminium form a gamma-prime [Ni₃(Al,Ti)] phase during aging that gives high tensile and creep-rupture strength, while the 18–21% chromium content forms a protective Cr₂O₃ scale providing good oxidation and scaling resistance to about 1000 °C. It also resists sulphur compounds in combustion gases, making it suitable for exhaust valves in heavy-oil engines, and offers good resistance to nitric and other acids.
It is produced by high-frequency melting (for extruded forms), electroslag-refined material (for forgings) and vacuum-refined versions. Typical applications include gas-turbine components (blades, rings and discs), high-temperature bolts and fasteners, nuclear boiler tube supports, die-casting inserts and cores, and automobile exhaust valves. A prerequisite for welding is that the material be in the solution-treated condition; strength is developed by a subsequent age-hardening treatment.
Values per manufacturer data, solution-treated and aged condition.
| Property | Value | Unit |
|---|---|---|
| Density | 8.19 | g/cm³ |
| Melting range | 1320–1365 | °C |
| Young's modulus (20 °C) | 222 | GPa |
| Specific heat capacity (20 °C) | 448 | J/kg·K |
| Thermal conductivity (20 °C) | 11.2 | W/m·K |
| Electrical resistivity (20 °C) | 1.24 | µΩ·m |
| Coefficient of thermal expansion (20–100 °C) | 12.7 | µm/m·°C |
| Maximum oxidation-resistance temperature | ~1000 | °C |
| Useful strength to | ~815 | °C |
Composition per DIN 17742 / EN 10269 (W.Nr. 2.4952 / 2.4631, NiCr20TiAl).
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel (+ Co) | Ni | Balance | — | Base; FCC matrix |
| Chromium | Cr | 18.0 | 21.0 | Oxidation / corrosion resistance |
| Titanium | Ti | 1.8 | 2.7 | γ′ Ni₃(Ti,Al) precipitation strengthening |
| Aluminium | Al | 1.0 | 1.8 | γ′ precipitation strengthening |
| Iron | Fe | — | 1.5 | Residual |
| Cobalt | Co | — | 1.0 | Residual |
| Manganese | Mn | — | 1.0 | Deoxidiser |
| Silicon | Si | — | 1.0 | Deoxidiser |
| Copper | Cu | — | 0.2 | Residual |
| Carbon | C | 0.04 | 0.10 | Carbide strengthening |
| Boron | B | — | 0.008 | Grain-boundary strengthening |
| Phosphorus | P | — | 0.02 | Residual impurity |
| Sulphur | S | — | 0.015 | Residual impurity |
Nominal: Ni-20Cr-2.4Ti-1.4Al. An age-hardenable Ni-Cr alloy strengthened by γ′ Ni₃(Ti,Al); creep-resistant and sulphur-resistant for service to ~815 °C. (W.Nr. 2.4952 and 2.4631 both designate this grade.)
Solution-treated and aged condition (1080 °C/8h AC + 700 °C/16h AC), per DIN 17742 for W.Nr. 2.4952.
| Property | Value | Unit |
|---|---|---|
| Tensile strength (Rm) | ≥1000 | MPa |
| 0.2% proof strength (Rp0.2) | ≥600 | MPa |
| Elongation at fracture (A) | ≥20 | % |
| Brinell hardness | ~250–350 | HB |
Values per EN/DIN; confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| High-temperature oxidation / scaling | Good | Protective Cr₂O₃ scale to ~1000 °C |
| Creep / stress-rupture (to 815 °C) | Excellent | γ′ strengthening; primary selling point |
| Sulphur-bearing combustion gases | Good | Suitable for exhaust valves (heavy-oil engines) |
| Nitric / phosphoric acids | Good | Ni-Cr base |
| Chloride stress-corrosion cracking | Good | High nickel content |
| General corrosion | Good | Comparable to alloy 75 |
A precipitation-hardening alloy. Strength is developed by solution treatment followed by aging.
Solution Treatment Temperature: ~1080 °C (1975 °F), ~8 h, air cool
Aging Temperature: ~700 °C (1290 °F), ~16 h, air cool Purpose: precipitates γ′ [Ni₃(Al,Ti)] for high tensile and creep-rupture strength.
Anneal (softening): ~1040 °C (1904 °F), water quench or air cool. Welding must be carried out in the solution-treated condition, with age-hardening applied afterwards to develop full properties.
Weldable by MMA/SMAW, GTAW/TIG and GMAW/MIG using a matching filler metal. As a γ′-strengthening alloy it can be susceptible to strain-age cracking, so a prerequisite for welding is that the material be in the solution-treated condition; age-hardening is applied after welding.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG · GMAW / MIG | Good (solution-treated) | EN ISO matching Ni-Cr-Ti filler (solution-treated base) |
| SMAW / MMA | Good | Matching Ni-Cr electrode |
Post-weld solution treatment + aging is recommended to restore full strength; minimise restraint to avoid strain-age cracking.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Preferred condition | Solution-treated (machine before final aging where possible) |
| Work hardening | High rate; rigid setup, positive rake, sharp tooling |
| Cutting | Low-to-moderate speed, ample feed, generous coolant |
Forming Processes
| Process | Notes |
|---|---|
| Hot forming | Above the solution range; ESR material for forgings |
| Cold forming | In solution-treated condition; high work-hardening rate |
| Final aging | After forming/machining to develop full strength |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Gas turbines | Blades, rings, discs | High creep-rupture strength to 815 °C |
| Aerospace | Fasteners, bolts, turbine hardware | High strength + oxidation resistance |
| Automotive | Exhaust valves (incl. heavy-oil engines) | Sulphur + high-temperature strength |
| Nuclear | Boiler tube supports | Creep strength + stability |
| Tooling | Die-casting inserts and cores | Hot strength + thermal fatigue |
| Marine / offshore | High-strength high-temperature hardware | Strength + corrosion resistance |
| Product Form | DIN Standard | BS / Other |
|---|---|---|
| Rod and bar | DIN 17742 | BS 3076 NA20 · BS HR1 / HR201 / HR401 / HR601 |
| Forgings | DIN 17754 | MSRR 7011 |
| Wire | DIN 17742-related | — |
| Plate, sheet and strip | DIN 17742-related | BS 3072 / 3073 NA20 |
| Composition / designation | W.Nr. 2.4631 / 2.4952 · NiCr20TiAl | AFNOR NC20TA |
| Welding consumables | EN ISO matching Ni-Cr-Ti filler | — |
W.Nr. 2.4631 / 2.4952 (NiCr20TiAl); BS 3076 NA20; DIN 17742.
| W.Nr. | Ni % | Cr % | Other | Best Used For |
|---|---|---|---|---|
| 2.4952 | bal | 18–21 | Ti 1.8–2.7, Al 1.0–1.8 | Age-hardened Ni-Cr; high strength to 815°C |
| 2.4951 | bal | 18–21 | Ti 0.2–0.6 | Solution-strengthened (base); oxidation to 1100°C |
| 1.4980 | 24–27 | 13.5–16 | Ti+Al (Fe-base γ′) | Iron-base age-hardened; to 704°C |
| 2.4654 | bal | 18–21 | Co 12–15, Mo, Ti+Al | Higher-strength γ′; sustained >700°C |
| 2.4668 | 50–55 | 17–21 | Nb+Ti+Al | Highest strength; turbine discs to 650°C |
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