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
NiCr23Mo16Cu is the EN symbol designation for a nickel-chromium-molybdenum corrosion-resistant alloy with a deliberate copper addition. This datasheet presents the material within the EN symbol designation system.
NiCr23Mo16Cu is unique among the versatile nickel-chromium-molybdenum materials in containing a deliberate copper addition, which together with its high molybdenum content gives greatly enhanced resistance to sulfuric acid and other reducing media. Its high chromium content maximises resistance to oxidizing chemicals and to process streams contaminated with ferric ions and dissolved oxygen, so the alloy performs well in both reducing and oxidizing environments — extending corrosion resistance across both regimes rather than being optimised for one. It is ductile, easy to form and weld, has exceptional resistance to chloride stress-corrosion cracking, and offers pitting and crevice resistance comparable to or better than the family-standard Ni-Mo-Cr-W grade. It is a single-phase, solid-solution alloy supplied in the solution-annealed condition.
Typical applications include chemical-process reactors, heat exchangers, valves and pumps handling mixed and contaminated acids, sulfuric and hydrochloric acid service, desalination, and marine equipment.
| Property | Value | Unit |
|---|---|---|
| Density | 8.50 | g/cm³ |
| Melting range | 1330–1400 | °C |
| Elastic modulus | 207 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 12.4 | µm/m·°C |
| Thermal conductivity (20 °C) | 8.6 | W/m·K |
| Specific heat (20 °C) | 428 | 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 | 22.0 | 24.0 | Oxidizing-media / pitting resistance |
| Molybdenum | Mo | 15.0 | 17.0 | Reducing-media / crevice resistance |
| Copper | Cu | 1.30 | 1.90 | Enhanced sulfuric-acid resistance |
| Iron | Fe | — | 3.0 | Residual |
| Cobalt | Co | — | 2.0 | Residual |
| Manganese | Mn | — | 0.50 | Deoxidiser |
| Carbon | C | — | 0.010 | Very low; minimises carbide precipitation |
Solution-annealed condition, per EN reference data for W.Nr. 2.4675.
| 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 | 207 GPa |
Values per EN reference data; the very low carbon content preserves corrosion resistance in the weld heat-affected zone. Confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| Sulfuric acid | Excellent | Copper + molybdenum; key advantage |
| Reducing acids (HCl, HF) | Excellent | High molybdenum |
| Oxidizing acids / ferric, cupric ions | Excellent | High chromium (23%) |
| Pitting / crevice corrosion | Excellent | Equal or better than C-276-type |
| Chloride stress-corrosion cracking | Excellent | High nickel content |
The combination of high chromium, high molybdenum and a copper addition gives outstanding resistance across both oxidizing and reducing media — including sulfuric, hydrochloric and hydrofluoric acids, and oxidizing streams with ferric or cupric ions — making it one of the most versatile corrosion-resistant alloys available.
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 very 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, heat exchangers, valves, pumps | Mixed oxidizing + reducing acid resistance |
| Acid production | Sulfuric / hydrochloric acid equipment | Sulfuric-acid resistance |
| Desalination | Components in seawater / brine | Chloride + crevice resistance |
| Marine | Fixtures, pump and mixer shafts | Seawater resistance |
| Product Form | DIN / EN Standard | Notes |
|---|---|---|
| Plate, sheet and strip | DIN 17750 · W.Nr. 2.4675 | NiCr23Mo16Cu |
| Bar, rod and forgings | DIN 17752 · W.Nr. 2.4675 | — |
| Seamless pipe and tube | DIN 17751 · W.Nr. 2.4675 | — |
| Inspection documents | EN 10204 | — |
Nickel-chromium-molybdenum corrosion-resistant alloy with copper. W.Nr. 2.4675 (NiCr23Mo16Cu).
| EN Symbol | Cr % | Mo % | Cu % | Best Used For |
|---|---|---|---|---|
| NiCr23Mo16Cu | 22–24 | 15–17 | 1.3–1.9 | Ni-Cr-Mo-Cu; broadest acid resistance, sulfuric acid, mixed media |
| NiCr21Mo14W | 20–22.5 | 12.5–14.5 | — | Versatile Ni-Cr-Mo-W; oxidizing + reducing media (C-22) |
| NiMo16Cr15W | 14.5–16.5 | 15–17 | — | Family standard; reducing media, wet chlorine (C-276) |
| NiCr22Mo9Nb | 20–23 | 8–10 | — | General Ni-Cr-Mo-Nb corrosion / strength (625) |
| NiMo28 | 1–3 | 27–32 | — | Ni-Mo alloy for hydrochloric acid (B-3) |
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