N06200 is a nickel-chromium-molybdenum corrosion-resistant alloy with a deliberate copper addition. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
Introduced in 1995, N06200 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 C-276. 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, typical values for UNS N06200.
| Condition | Property | Value |
|---|---|---|
| Solution annealed | Tensile strength (UTS) | ≥690 MPa (100 ksi) |
| Solution annealed | 0.2% yield strength | ≥310 MPa (45 ksi) |
| Solution annealed | Elongation at break | ≥45 % |
| As-welded | Corrosion resistance | Retained (low carbon) |
| — | Elastic modulus | 207 GPa |
Confirm against the mill test report. The very low carbon content preserves corrosion resistance in the weld heat-affected zone.
| 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 |
| 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 (2050 °F) 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 (ERNiCrMo-17), 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 C-2000 filler (ERNiCrMo-17) |
| GMAW / MIG | Good | Matching filler |
| SMAW / stick | Good | Matching electrode (ENiCrMo-17) |
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; similar to C-276; work-hardens |
| 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 | ASTM Standard | ASME |
|---|---|---|
| Plate, sheet and strip | ASTM B575 | ASME SB-575 |
| Bar, rod and forgings | ASTM B574 / B564 | ASME SB-574 |
| Seamless pipe and tube | ASTM B622 | ASME SB-622 |
| Welded pipe and tube | ASTM B619 / B626 | ASME SB-619 |
Nickel-chromium-molybdenum corrosion-resistant alloy with copper. UNS N06200.
| UNS | Cr % | Mo % | Cu % | Best Used For |
|---|---|---|---|---|
| N06200 | 22–24 | 15–17 | 1.3–1.9 | Ni-Cr-Mo-Cu; broadest acid resistance, sulfuric acid, mixed media |
| N06022 | 20–22.5 | 12.5–14.5 | — | Versatile Ni-Cr-Mo-W; oxidizing + reducing media (C-22) |
| N10276 | 14.5–16.5 | 15–17 | — | Family standard; reducing media, wet chlorine (C-276) |
| N06625 | 20–23 | 8–10 | — | General Ni-Cr-Mo-Nb corrosion / strength (625) |
| N10675 | 1–3 | 27–32 | — | Ni-Mo alloy for hydrochloric acid (B-3) |




