Alloy 81NMA
Designation
| Name | The value |
|---|---|
| Designation GOST Cyrillic | 81НМА |
| Designation GOST Latin | 81HMA |
| Transliteration | 81NMA |
| By chemical elements | 81NiCu |
Description
Alloy 81NMA used: for the manufacture of cores of magnetic heads, small transformers, chokes, relays, flaw detectors, magnetic shields, ferroprobes for use in electronic equipment of high sensitivity.
Note
The alloy with the highest value of magnetic permeability in weak permanent and variable magnetic fields with low sensitivity to mechanical stress and increased strength. Depending on the final heat treatment σIn can be from 640 N/mm2 (65 kgf/mm2) to 1270 N/mm2 (130 kgf/mm2).
Standards
| Name | Code | Standards |
|---|---|---|
| Classification, nomenclature and General rules | В30 | GOST 10160-75, GOST 10994-74 |
| Bars and shapes | В32 | TU 14-11-245-88 |
Chemical composition
| Standard | C | S | P | Mn | Si | Ni | Fe | Ti | Mo |
|---|---|---|---|---|---|---|---|---|---|
| GOST 10994-74 | ≤0.01 | ≤0.01 | ≤0.01 | ≤0.35 | ≤0.1 | 80.5-81.7 | Rest | 2.5-3.3 | 4.7-5.2 |
Ni is the basis.
