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Tape, round, wire 80НМ
general characteristics
The alloy 80NM according to GOST-19693−74 is magnetically soft, has no more than 4 kA / m coercive force by induction. The precision mark of 80MM has a low coercive force with the induction of saturation of 0.65−0.75 T in weak fields and a very high magnetic permeability. At the end of heat treatment with gradual cooling starting from + 600 ° C, there is a slight change in the characteristics in the climatic temperature range. Magnetically soft materials have a high value of magnetic initial permeability, they can be magnetized to saturation and in weak fields. In addition to iron, they include cobalt, nickel, and molybdenum. The class of magnetically soft materials also includes especially pure ferromagnetic iron, low-carbon electrotechnical steels (undoped, siliceous), precision low-coercivity alloys with iron-nickel, iron base, ferrimagnetic and ferromagnetic powder, composite. Such alloys are melted in metallurgical special furnaces to obtain the required shapes, followed by forging or rolling ingots. Magnetic soft alloys are widely used in the production of transformer cores, in microphones, memory components for computers, magnetic circuits that are designed for operation in seawater, parts for electric machines, magnetic antennas.
Relevance
The 80NM alloy is used, as a rule, in electrical machine building, in the production of magnetic field magnetic flux cores, in transformer engineering, in the radio engineering, electrical engineering industries, in automation systems, telemechanics, and computer measuring equipment.
| Welding: | |
|---|---|
| Bounded welding | — welding is possible during heating up to the tempo. 100−120 oC and thermal further processing |
| Compostable | — In order to obtain welded quality joints, it is necessary to perform additional operations: during welding, heating to temper. 200−300 ° C, heat treatment (annealing) after welding. |
| Welded without restrictions | — welding is carried out without thermal further processing and preheating. |
Chemical composition of 80NM in percent
| Mn | Cr | C | Si | S | Co | Ni | P |
|---|---|---|---|---|---|---|---|
| 0.2 — 0.4 | 0.3 — 0.6 | Up to 0.04 | Up to 0.25 | Up to 0.015 | 26.5 — 28 | Up to 0.3 | Up to 0.015 |
The physical characteristics of the brand are 80NM.
| L | R | C | T | R 10 9 | E 10−5 | A 10 6 |
|---|---|---|---|---|---|---|
| 100 | 10.7 | |||||
| W / (m · deg) | Kg / m3 | J / (kg · deg) | Grad | Ohm · m | MPa | 1 / Grad |
| 7980 | 20 | 200 | 2.2 |
Notation:
| The physical characteristics of this grade of alloy: | |
|---|---|
| — the first kind of modulus of elasticity, [MPa] | — E |
| — Heat capacity of the material (or coefficient of heat conductivity), in [W / (m · deg)] | -l |
| — The temperature required to obtain these properties, [Grad] | — T |
| — linear coefficient. Temper. Expansion in [1 / Grad] (temp. Interval 20 ° C), | -a |
| — electrical resistivity, in [Ohm · m] | -R |
| — The density of this material, [kg / m3] | -r |
| — Specific heat of specific material in [J / (kg · deg)] (temp. Interval 20 ° C) | -C |
Magnetic characteristics:
| — force coercive (not higher), in [A / m] | Hc |
|---|---|
| — permeability is magnetic (not higher), in [MH / m] | Umax |
| — loss of specific (not higher) frequency 50 Hz, magnetic induction 1.0 T, in [W / kg] | P1.0 / 50 |
| — Magnetic Tl induction, the magnetic field strength is not less than 100, in a magnetic field, in [A / m] | B100 |
Mechanical characteristics of 80NM at temperatures of 20oC.
| Assortment | D5 | For example. | Heat treatment. | ST | The size | Sv | Y | KCU | Y |
|---|---|---|---|---|---|---|---|---|---|
| Hardened. Tape, according to GOST 10160−75 | 2 | 1080 | |||||||
| Tape, according to GOST 10160−75 | 20 | 295 | 590 | ||||||
| - | % | - | - | MPa | Mm | MPa | % | KJ / m2 | % |
| Mechanical characteristics: | |
|---|---|
| — Strength of short-term, in [MPa] | Sv |
| — Yield limit (proportionality limit) for deformation of residual, in [MPa] | ST |
| — at break, the relative elongation, in [%] | D5 |
| — the restriction is relative, in [%] | Y |
| — Impact viscosity, in [kJ / m2] | KCU |
| — Brinell hardness, in [MPa] | HB |
Application
The 80NM alloy is actual in the production of cores of small-sized transformers, relays and chokes, which work in weak fields of magnetic screens; In the manufacture of non-contact relays of small thicknesses (0.05−0.02 mm) of magnetic amplifiers and cores of pulse transformers.
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