24 July 2021 Precision Alloys
3J60 precision alloy steel bar
3j60 precision alloy is a low - frequency soft magnetic material with high magnetic permeability and low coercivity in a weak magnetic field. Early precision alloy for telephone communication, followed by a heat treatment process and vacuum smelting method to make the alloy characteristics have been greatly improved. Ni-based Ni-Ag alloy has a magnetic permeability of about 10 to 20 times higher than that of silicon steel, and is widely used in sensitive relays, magnetic shields, telephones and radio transformers, precision AC and DC meters, current transformers Transformer). In the precision alloy by adding molybdenum, manganese, cobalt, copper, chromium and other elements, can be obtained with greater initial permeability μi and permeability of the ternary, four-precision alloy.
Precision alloy with narrow and steep hysteresis loop, in the weak magnetic field has a large permeability and very small coercivity, but its resistivity is not large, only suitable for 1 MHz below the frequency range of work, otherwise Eddy current loss is too large. Iron-nickel alloy processing performance, can be made into a variety of complex shapes, size requirements of accurate components. But its magnetic properties are more sensitive to mechanical stress, process factors on the magnetic properties of a greater impact, such as stamping will μb decline, and thus product performance consistency is not easy to meet. The cost of iron-nickel alloy is high. Commonly used precision alloy properties and uses listed in the table.
Precision alloy / permalloy they can have high permeability, but also can be reasonable with iron and nickel content, to obtain a relatively high permalloy saturated magnetic induction. However, this permalloy resistivity is low, mechanical properties are not good, so the actual application is not a lot. At present, a large number of applications of permalloy is based on iron and nickel to add some other elements, such as molybdenum, copper and so on. The purpose of adding these elements is to increase the resistivity of the material to reduce the eddy current loss after making the core. At the same time, adding elements can also improve the hardness of the material, which is particularly beneficial as a head and other wear applications.