The production and application of soft magnetic alloys have a history of more than 100 years.
In 1890, the company began to produce pure thermal-magnetic iron (or low carbon steel), which is used to make motors and transformer cores.
In 1900, ferrosilicon alloy (silicon steel sheet) was introduced, which quickly replaced pure iron and has been the most productive soft magnetic material.
With the development and need of telephone system, American g.w. men invented nickel-iron alloy (permo alloy) in 1913, which has better magnetism than silicon steel under weak and medium magnetic field.
From 1929 to 1931, fe-co alloy and fe-si-al alloy with different magnetic properties appeared successively to meet special needs. In the early 1970s, an amorphous soft magnetic alloy was developed which was completely different from the traditional soft magnetic alloy in structure and production mode.
At the end of 1980s, the development of soft magnetic alloys with fast quenching microcrystalline and nanocrystalline has entered a new stage.
China began to produce hot-rolled silicon steel sheets in the 1950s, and various soft magnetic alloys mainly composed of fe-ni and fe-co alloys in the 1960s. In the 1970s, cold-rolled oriented silicon steel sheets were produced. In the mid-to-late 1980s, large quantities of amorphous soft magnetic alloys were produced, and microcrystalline and nanocrystalline soft magnetic alloys were developed in the 1990s.
Since the 1980s, China has formulated and promulgated national standards for technical conditions for the production of soft magnetic alloys.