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
Alloy W is a nickel-molybdenum-chromium solid-solution-strengthened superalloy developed primarily as a filler metal for welding dissimilar alloys. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
Developed primarily as a filler metal, Alloy W displays excellent dissimilar-welding characteristics and is widely used for joining dissimilar solid-solution-strengthened nickel alloys in the gas-turbine and aerospace industries. Its high molybdenum content provides solid-solution strength and good resistance to reducing media, while the chromium addition contributes oxidation resistance; the low carbon content minimises grain-boundary precipitation, so reliable welds can be made without post-weld heat treatment. The properties of dissimilar weld joints made with alloy W depend on the alloys being joined but are generally acceptable for a wide variety of combinations. It is supplied in the solution heat-treated condition.
Typical applications include filler metal for gas-metal-arc and gas-tungsten-arc welding of dissimilar nickel alloys and stainless steels in gas-turbine, aerospace and chemical-process industries, and a limited number of wrought ring-type components in older gas-turbine engines.
| Property | Value | Unit |
|---|---|---|
| Density | 9.03 | g/cm³ |
| Melting range | 1300–1360 | °C |
| Elastic modulus | 218 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 11.3 | µm/m·°C |
| Thermal conductivity (20 °C) | 11.4 | W/m·K |
| Specific heat (20 °C) | 381 | J/kg·K |
| Structure | Austenitic (FCC), single phase | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance | — | Base element |
| Molybdenum | Mo | 23.0 | 26.0 | Solid-solution strengthening; reducing-media resistance |
| Chromium | Cr | 4.0 | 6.0 | Oxidation resistance |
| Iron | Fe | 4.0 | 7.0 | Solid-solution |
| Cobalt | Co | — | 2.50 | Residual |
| Vanadium | V | — | 0.60 | Minor |
| Manganese | Mn | — | 1.0 | Deoxidiser |
| Silicon | Si | — | 1.0 | Residual |
| Carbon | C | — | 0.12 | Carbide formation |
Solution heat-treated condition, typical values for UNS N10004.
| Condition | Property | Value |
|---|---|---|
| Solution annealed | Tensile strength (UTS) | ≥795 MPa (115 ksi) |
| Solution annealed | 0.2% yield strength | ≥360 MPa (52 ksi) |
| Solution annealed | Elongation at break | ≥30 % |
| Dissimilar weld joint | Properties | Depend on alloys joined |
| — | Elastic modulus | 218 GPa |
Confirm against the mill test report. As a filler metal, the alloy's value lies in the integrity of dissimilar weld joints rather than wrought-product strength.
| Environment | Performance | Notes |
|---|---|---|
| Reducing media | Good | High molybdenum content |
| High-temperature oxidation | Good | Chromium-bearing |
| Dissimilar weld-joint service | Very Good | Wide variety of nickel-alloy combinations |
| Radiation exposure | Good | Suitable for some nuclear applications |
| Strong oxidizing acids | Moderate | Lower chromium than C-type alloys |
The high molybdenum content gives good resistance to reducing media, while the chromium addition provides oxidation resistance; the alloy is most valued for the soundness and general acceptability of the dissimilar weld joints it produces rather than for service as a primary corrosion-resistant alloy.
A single-phase solid-solution alloy; not hardenable by precipitation. Properties are set by solution annealing.
Solution Anneal Solution anneal at approximately 1175 °C (2150 °F) and rapidly quench (water or rapid air cool) to dissolve secondary phases and retain a uniform structure. The alloy is not strengthened by heat treatment; cold work raises strength.
Excellent dissimilar-welding characteristics; this is the alloy's primary purpose. Used as filler metal for gas-metal-arc and gas-tungsten-arc welding of dissimilar solid-solution-strengthened nickel alloys and stainless steels. The low carbon content minimises grain-boundary precipitation, so welds are reliable without post-weld heat treatment.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Excellent | Alloy W filler (ERNiMo-3) |
| GMAW / MIG | Excellent | Alloy W filler (ERNiMo-3) |
| As filler metal | Primary use | Dissimilar nickel-alloy joints |
The alloy is itself a filler metal (AWS A5.14 ERNiMo-3); welds are reliable without post-weld heat treatment.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Difficult; work-hardens, rigid setups, sharp tooling |
| Speeds | Slow speeds, positive feeds, no dwelling |
| Coolant | Ample coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Limited; primarily supplied as wire / filler |
| Hot forming | ~1175 °C; solution anneal afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Aerospace / gas turbine | Dissimilar-alloy weld filler | Sound dissimilar joints |
| Gas turbine | Ring-type components (older engines) | High-temperature strength |
| Chemical process | Dissimilar nickel-alloy welds | Reducing-media resistance |
| Nuclear | Components under radiation | Structural stability |
| Product Form | Standard | Notes |
|---|---|---|
| Welding wire / filler | AWS A5.14 ERNiMo-3 | ASME SFA-5.14; primary form |
| Bar and forgings | ASTM B564 | AMS 5786 |
| Sheet and plate | UNS N10004 | Limited |
| Material designation | UNS N10004 | Dissimilar-welding filler |
Nickel-molybdenum-chromium solid-solution alloy. UNS N10004.
| Alloy | Mo % | Cr % | Primary Role | Best Used For |
|---|---|---|---|---|
| Alloy W | 23–26 | 4–6 | Dissimilar-weld filler | Filler metal for dissimilar nickel-alloy joints; turbine, aerospace |
| Alloy X | 8–10 | 20.5–23 | Wrought high-temp | Gas-turbine combustors, furnace parts |
| Alloy S | 14–16.5 | 14.5–17 | Wrought high-temp | Seal rings, dissimilar filler |
| Alloy B-3 | 27–32 | 1–3 | Wrought corrosion | Hydrochloric acid; reducing media |
| Alloy N | 15–18 | 6–8 | Wrought corrosion | Molten fluoride salts; reactors |
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