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The material labeled 80NM refers to the magnetically soft type of precision alloys, which ensures its high magnetic permeability, and full saturation even from the action of weak fields. As a result of heat treatment based on the gradual cooling of raw materials from six hundred degrees to normal temperature, some change in the basic performance can be observed with a change in the temperature regime.
Given the important magnetic properties of this material, it is most often used in the process of manufacturing cores for small-sized transformers. Such products are also in demand when manufacturing chokes or various relays operating under the influence of a weak magnetic field field. To date, the scope of such a product as the 80NM alloy is quite diverse and extends from the core of a pulse type transformer to relay devices of small thickness. Therefore, its production is constantly growing and improving.
Features and Production
By its nature, the precision raw material of the magnetically soft type has a sufficiently large exponent of the initial magnetic permeability, so even the action of a small force field can saturate the material completely. Most often this type of alloy includes in its composition, in addition to the ferruginous portion, a certain amount of cobalt and nickel. Due to such parameters, such raw material is very in demand as a semi-finished product for manufacturing magnetic wires with an alternating field.
The process of producing such materials is laborious and complex. It requires the use not only of special equipment, but also a sufficiently high qualification of personnel, as well as strict control over compliance with treatment regimes at each technological repartition. Smelting of this composition takes place in specialized furnaces, with the use of strictly regulated charge, after obtaining ingots, for final finishing of the products they are subjected to pressure treatment.
The percentage composition of 80NM GOST 10994−74 .
Due to the significant nickel content, the 80NM alloy has a high electrical resistance and corrosion resistance.
|Elastic modulus||MPa||E * 10−5||2.2|
|Measurement temperature||◦ C||T||20|
|Density||Kg / m3||R||7980|
|Electrical resistance (specific)||Ohm * m||R * 10 9||200|
|The index of linear temperature expansion (at t = 100 ° C)||1 / deg||A * 10 6||10.7|
|Mechanical properties (at 20 ° C)|
|Name of the characteristic||Tape||Thinning tape|
|Short-term tensile strength, MPa (ss)||590||1080|
|Yield point, MPa (sT)||295|
|Relative elongation at break,% (d5)||20||2|
When forming welded structures, all materials can be divided into three types: difficult welded compounds, alloys without welding restrictions and materials that are limitedly welded. Alloys 80NM due to the large content of nickel belongs to the latter category. For a limited welded alloy, preliminary preparation is required (heating the material to one hundred and one hundred and twenty degrees and heat treatment of the product after the end of the procedure). The alloy not limited to welding is perfectly connected without any preparatory operations and subsequent processing. The material is characterized as being difficult to weld requires serious enough manipulation to obtain a quality welded seam. Preliminary it must be warmed up well (providing a surface temperature from two hundred to three hundred degrees), then annealed and additionally subjected to heat treatment after welding.
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