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
2.4733 is a nickel–chromium–tungsten–molybdenum alloy with a small lanthanum addition, combining excellent high-temperature strength, outstanding oxidation resistance and exceptional long-term thermal stability. This datasheet presents the material within the European (DIN / EN / Werkstoff-Nummer) standard system.
The nickel base with ~22% chromium and a lanthanum micro-addition gives outstanding resistance to oxidising environments for prolonged exposure to about 1149 °C (2100 °F), together with premier resistance to nitriding atmospheres. Tungsten (~14%) and molybdenum (~2%) provide solid-solution strengthening, while the alloy also offers lower thermal expansion than most high-temperature alloys and a pronounced resistance to grain coarsening with prolonged high-temperature exposure. A key attribute is its long-term stability: it does not form embrittling sigma or mu phases even after 16,000 hours of exposure between 649 and 870 °C, retaining excellent ductility.
It is readily fabricated, formed, welded and castable. It may be forged or hot-worked from ~1177 °C (2150 °F), and is readily cold-formed owing to its good ductility. Typical applications include gas-turbine combustion hardware and transition ducts, petrochemical and thermal-processing equipment, nitric-acid production, and other components requiring a balance of strength, oxidation/nitridation resistance and stability.
Values per manufacturer ( / Ulbrich) data, solution-annealed condition.
| Property | Value | Unit |
|---|---|---|
| Density | 8.97 | g/cm³ |
| Melting range | 1301–1371 | °C |
| Young's modulus (20 °C) | 211 | GPa |
| Specific heat capacity (21 °C) | 397 | J/kg·K |
| Thermal conductivity (20 °C) | 8.9 | W/m·K |
| Coefficient of thermal expansion (20–100 °C) | 12.7 | µm/m·°C |
| Electrical resistivity (20 °C) | 1.25 | µΩ·m |
| Maximum oxidation-resistance temperature | ~1149 | °C |
| Structure | Austenitic (FCC) | — |
Composition per DIN 17744 (W.Nr. 2.4733, NiCr22W14Mo).
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance | — | Base; FCC matrix |
| Chromium | Cr | 20.0 | 24.0 | Oxidation resistance |
| Tungsten | W | 13.0 | 15.0 | Solid-solution strengthening |
| Molybdenum | Mo | 1.0 | 3.0 | Solid-solution strengthening |
| Iron | Fe | — | 3.0 | Residual |
| Cobalt | Co | — | 5.0 | Residual |
| Manganese | Mn | 0.30 | 1.0 | Deoxidiser |
| Silicon | Si | 0.25 | 0.75 | Oxidation resistance |
| Aluminium | Al | 0.20 | 0.50 | Oxidation resistance |
| Carbon | C | 0.05 | 0.15 | Carbide strengthening |
| Lanthanum | La | 0.005 | 0.05 | Oxide-scale adherence |
| Boron | B | — | 0.015 | Grain-boundary strengthening |
Nominal: Ni-22Cr-14W-2Mo-La ( 230). Tungsten/molybdenum solid-solution-strengthened Ni-Cr alloy with excellent high-temperature strength, oxidation resistance to ~1150 °C and long-term thermal stability.
Solution-annealed condition, per DIN 17744 for W.Nr. 2.4733.
| Property | Value | Unit |
|---|---|---|
| Tensile strength (Rm) | ≥760 | MPa |
| 0.2% proof strength (Rp0.2) | ≥310 | MPa |
| Elongation at fracture (A) | ≥40 | % |
| Brinell hardness | ~210–250 | HB |
Values per EN/DIN; confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| High-temperature oxidation | Outstanding | To ~1149 °C (2100 °F) prolonged; La-stabilised scale |
| Nitriding atmospheres | Premier | A key advantage of alloy 230 |
| Long-term thermal stability | Outstanding | No sigma/mu phase after 16,000 h at 649–870 °C |
| Thermal cycling | Excellent | Low expansion; scale adhesion |
| Grain coarsening | Resistant | Stable grain size at high temperature |
| High-temperature strength / creep | Excellent | W + Mo solid-solution + carbides |
| Carburisation | Good | Typical of high-Ni-Cr |
A solid-solution nickel-base alloy; strengthened by solid solution, carbides and cold work. Heat treatment is solution annealing.
Solution Anneal Temperature: ~1177–1232 °C (2150–2250 °F), followed by rapid cooling Purpose: dissolves carbides, restores ductility and develops optimum properties.
Hot or cold worked parts are annealed and cooled rapidly to ensure the best balance of properties. Hot working is carried out from ~1177 °C (2150 °F). Owing to its thermal stability, the alloy resists embrittlement during service.
Excellent welding and forming characteristics; welding behaviour is similar to Hastelloy X. Joined by gas-tungsten-arc (GTAW), gas-metal-arc (GMAW), shielded-metal-arc (SMAW) and resistance welding, using matching filler. The alloy is also castable.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG · GMAW / MIG | Excellent | EN ISO 18274 matching Ni-Cr-W-Mo filler |
| SMAW / stick | Good | Matching Ni-Cr-W-Mo electrode |
| Resistance welding | Good | — |
Use matching-composition filler. Anneal and rapidly cool fabricated parts for the best balance of properties.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Work hardening | Moderate-to-high; rigid setup, sharp tooling, positive rake |
| Cutting | Low-to-moderate speed, ample feed; flood coolant |
| Preferred condition | Solution-annealed |
Forming Processes
| Process | Notes |
|---|---|
| Hot working | From ~1177 °C (2150 °F) |
| Cold forming | Readily cold-formed (good ductility); cold-rollable to tempers |
| Casting | Castable by air-melt sand or vacuum methods |
| Solution anneal | ~1177–1232 °C, rapid cool, after forming |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Gas turbines | Combustion cans, transition ducts, hot-section hardware | Oxidation to 1149 °C + strength + stability |
| Petrochemical | Catalyst-grid supports, reformer/cracking hardware | Nitridation + thermal stability |
| Thermal processing | Furnace internals, fixtures, retorts | Oxidation + grain-coarsening resistance |
| Nitric-acid production | High-temperature process hardware | Nitriding-environment resistance |
| Aerospace | High-temperature ducting and structures | Strength + low expansion |
| Power / energy | High-temperature structural components | Long-term thermal stability |
| Product Form | DIN Standard | EN Symbol | Other |
|---|---|---|---|
| Sheet, strip and plate | DIN 17744 | NiCr22W14Mo | VdTÜV-approved |
| Bar, rod and forgings | DIN 17752 / 17754 | NiCr22W14Mo | — |
| Seamless tube | DIN 17751 | NiCr22W14Mo | — |
| Composition / designation | W.Nr. 2.4733 | NiCr22W14Mo | — |
| Welding consumables | EN ISO 18274 matching Ni-Cr-W-Mo filler | — | — |
Nickel-base high-temperature alloy. W.Nr. 2.4733 (NiCr22W14Mo); DIN 17744. Tempers per DIN 17750 (e.g. F76).
| W.Nr. | Ni/Co | Cr % | Other | Best Used For |
|---|---|---|---|---|
| 2.4733 | Ni bal | 20–24 | W 14, Mo 2, La | Oxidation to 1149°C + nitriding + stability |
| 2.4683 | Co bal | 20–24 | W 14, Ni 22, La | Cobalt-base; oxidation to 1095°C |
| 2.4964 | Co bal | 19–21 | W 15, Ni 10 | Cobalt-base; strongest fabricable Co alloy |
| 2.4665 | Ni bal | 20.5–23 | Mo 9, Fe 18 | Ni-base; combustor; oxidation to 1200°C |
| 2.4856 | Ni bal | 20–23 | Mo 9, Nb | Ni-base; aqueous corrosion + strength |
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