Designation
| Name |
The value |
| Designation GOST Cyrillic |
79НМ |
| Designation GOST Latin |
79HM |
| Transliteration |
79NM |
| By chemical elements |
79NiCu |
| Name |
The value |
| Designation GOST Cyrillic |
80НМ |
| Designation GOST Latin |
80HM |
| Transliteration |
80NM |
| By chemical elements |
80NiCu |
Description
Alloy 79NM used: for the manufacture of small cores of transformers, chokes and relays, working in weak magnetic fields, screens; small thickness (0,05−0,02 mm) — for the cores of pulse transformers, magnetic amplifiers and contactless relays.
Note
Alloy with high magnetic permeability in weak fields at saturation induction of 0.65−0.75 T.
Alloy after heat treatment with slow cooling from +600 °C is characterized by a slight change of properties in the climatic temperature range.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and General rules |
В30 |
GOST 10160-75, GOST 10994-74 |
| Sheets and strips |
В33 |
TU 14-1-1204-74 |
| Tape |
В34 |
TU 14-1-1306-75, TU 14-1-1708-76, TU 14-1-1740-75, TU 14-1-2664-79 |
| Processing of metals by pressure. Forgings |
В03 |
TU 14-1-1530-75 |
| Blanks. Of the workpiece. Slabs |
В31 |
TU 14-1-1833-76, TU 14-1-2545-78, TU 14-1-3904-84 |
| Bars and shapes |
В32 |
TU 14-1-2830-79, TU 14-131-851-92, TU 14-11-245-88 |
| Wire, steel, alloy |
В73 |
TU 14-1-468-73 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Si |
Ni |
Fe |
Cu |
Al |
Ti |
Mo |
| TU 14-131-851-92 |
≤0.03 |
≤0.02 |
≤0.02 |
0.6-1.1 |
0.3-50 |
78.5-80 |
Rest |
≤0.2 |
≤0.15 |
≤0.15 |
3.8-4.1 |
| TU 14-1-1708-76 |
≤0.03 |
≤0.006 |
≤0.02 |
0.4-0.6 |
≤0.25 |
79.4-80.6 |
Rest |
- |
- |
- |
5-5.4 |
Ni is the basis.
According to GOST 10994-74 the chemical composition is given for the alloy 79NM.
According to TU 14-1-1708-76 the chemical composition is given for the alloy 80NM.
According to TU 14-1-2830-79 the chemical composition is given for the alloy grade 79NM-IP.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
HB, MPa |
| The tape is in delivery condition (transverse specimens) |
|
≥980 |
≥1030 |
120-210 |
Description mechanical marks
| Name |
Description |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σU |
Limit short-term strength |
| HB |
Brinell hardness number |
Physical characteristics
| Temperature |
r, kg/m3 |
| 20 |
8600 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
Technological properties
| Name |
The value |
| Particularities of production of goods |
Tape on the other 14-1-1708-76 supplied in cold-worked condition without heat treatment. |
