Nickel 200 vs Nickel 201
Same resistivity, same density, same drawing route. One number separates them, and it only matters above 315 °C.
| Nickel 200 (N6) | Nickel 201 (N4) | |
|---|---|---|
| Carbon | ≤ 0.15 % | ≤ 0.02 % |
| Nickel + cobalt | ≥ 99.0 % | ≥ 99.0 % |
| Resistivity | ≈ 0.069 µΩ·m | ≈ 0.069 µΩ·m |
| Max service in air | ≈ 315 °C | ≈ 600 °C |
| Relative cost | Lower | Higher |
| Weld zone ductility | Adequate | Better |
What carbon actually does
Above roughly 315 °C, carbon in Nickel 200 precipitates as graphite at the grain boundaries. The wire does not fail in service immediately — it fails when the assembly is bent, or when the furnace cycles. This is why the temperature limit exists and why it is a hard line rather than a recommendation.
The decision, in one line
Below 315 °C: buy Nickel 200 and put the saving into diameter control. Above 315 °C: buy Nickel 201 and ask for the carbon figure on the certificate, not just the grade name.
"Carbon content to be reported on the inspection report for each lot." That sentence does more for you than specifying the grade alone, because it makes the number auditable.
Are N4 and N6 the same as 201 and 200?
Does the higher carbon affect drawing?
Send the specification — diameter, grade, temper, quantity.
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