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
NiCr21Mo14W is the EN symbol designation for a nickel-chromium-molybdenum-tungsten corrosion-resistant alloy. This datasheet presents the material within the EN symbol designation system.
One of the most versatile nickel-chromium-molybdenum alloys, NiCr21Mo14W offers a balanced content of molybdenum and tungsten that gives outstanding resistance in both oxidizing and reducing environments: its high chromium content resists oxidizing media such as nitric acid and ferric and cupric chlorides, while its molybdenum and tungsten resist reducing media such as sulfuric and hydrochloric acids. It has exceptional resistance to pitting, crevice corrosion and stress-corrosion cracking, and its low carbon content minimises grain-boundary carbide precipitation during welding, allowing use in the as-welded condition. It is a single-phase, solid-solution alloy supplied in the solution-annealed condition.
Typical applications include chemical and petrochemical processing, flue-gas desulfurisation and pollution control, pulp-and-paper, marine and waste-treatment equipment.
| Property | Value | Unit |
|---|---|---|
| Density | 8.69 | g/cm³ |
| Melting range | 1357–1399 | °C |
| Elastic modulus | 206 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 12.4 | µm/m·°C |
| Thermal conductivity (20 °C) | 10.1 | W/m·K |
| Specific heat (20 °C) | 414 | J/kg·K |
| Structure | Austenitic (FCC), single phase | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance | — | Base element; reducing-media resistance |
| Chromium | Cr | 20.0 | 22.5 | Oxidizing-media / pitting resistance |
| Molybdenum | Mo | 12.5 | 14.5 | Reducing-media / crevice resistance |
| Tungsten | W | 2.50 | 3.50 | Reducing-media resistance |
| Iron | Fe | 2.0 | 6.0 | Residual |
| Cobalt | Co | — | 2.50 | Residual |
| Vanadium | V | — | 0.35 | Residual |
| Carbon | C | — | 0.015 | Low; minimises carbide precipitation |
Solution-annealed condition, per EN reference data for W.Nr. 2.4602.
| Condition | Property | Value |
|---|---|---|
| Solution annealed | Tensile strength (Rm) | ≥690 MPa |
| Solution annealed | 0.2% proof strength (Rp0.2) | ≥310 MPa |
| Solution annealed | Elongation (A5) | ≥45 % |
| As-welded | Corrosion resistance | Retained (low carbon) |
| — | Elastic modulus | 206 GPa |
Values per EN reference data; the low carbon content preserves corrosion resistance in the weld heat-affected zone. Confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| Oxidizing acids (HNO₃, ferric/cupric chloride) | Excellent | High chromium content |
| Reducing acids (H₂SO₄, HCl) | Excellent | Molybdenum + tungsten |
| Pitting / crevice corrosion | Excellent | Superior to stainless steels |
| Stress-corrosion cracking | Excellent | High nickel content |
| Wet chlorine / mixed acids | Excellent | Versatile oxidizing/reducing performance |
The balanced chromium, molybdenum and tungsten content gives outstanding resistance across both oxidizing and reducing environments — including wet chlorine, mixed and contaminated acids, seawater and brines — with exceptional resistance to localized attack, making it suitable for "upset" and multipurpose process conditions.
A single-phase solid-solution alloy; not hardenable by precipitation. Properties are set by solution annealing.
Solution Anneal Solution anneal at approximately 1120 °C and rapidly quench (water or rapid air cool) to dissolve secondary phases and retain maximum corrosion resistance. The alloy is not strengthened by heat treatment; cold work raises strength.
Excellent weldability; readily welded by the gas-tungsten-arc and gas-metal-arc processes with matching filler, and used in the as-welded condition owing to its low carbon content. No post-weld heat treatment is normally required.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Excellent | Matching filler |
| GMAW / MIG | Good | Matching filler |
| SMAW / stick | Good | Matching electrode |
Weld with matching filler and clean surfaces; the alloy may be used as-welded 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 | Good; work-hardens, anneal between heavy operations |
| Hot forming | 1010–1175 °C; solution anneal afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Chemical / petrochemical | Reactors, columns, heat exchangers | Oxidizing + reducing acid resistance |
| Pollution control | Flue-gas desulfurisation (FGD) systems | Wet-corrosion + chloride resistance |
| Pulp & paper | Bleaching equipment | Chloride / acid resistance |
| Marine / waste | Components, waste-treatment hardware | Seawater + mixed-media resistance |
| Product Form | DIN / EN Standard | Notes |
|---|---|---|
| Plate, sheet and strip | DIN 17744 · W.Nr. 2.4602 | NiCr21Mo14W |
| Bar, rod and section | W.Nr. 2.4602 | — |
| Seamless pipe and tube | DIN 17751 · W.Nr. 2.4602 | — |
| Inspection documents | EN 10204 | — |
Nickel-chromium-molybdenum-tungsten corrosion-resistant alloy. W.Nr. 2.4602 (NiCr21Mo14W).
| EN Symbol | Cr % | Mo % | W % | Best Used For |
|---|---|---|---|---|
| NiCr21Mo14W | 20–22.5 | 12.5–14.5 | 2.5–3.5 | Versatile Ni-Cr-Mo-W; oxidizing + reducing media, mixed acids |
| NiCr16Mo16W | 14.5–16.5 | 15–17 | 3–4.5 | Reducing-media-oriented Ni-Cr-Mo-W (C-276) |
| NiMo16Cr16Ti | 14–18 | 14–17 | — | Thermally stable Ni-Cr-Mo alloy (C-4) |
| NiCr22Mo9Nb | 20–23 | 8–10 | — | General Ni-Cr-Mo-Nb corrosion / strength (625) |
| NiCr23Mo16Cu | 22–24 | 15–17 | — | Ni-Cr-Mo-Cu; broadest acid resistance (C-2000) |
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