SU241682A1 - MAGNETIC SOFT IRON - Google Patents

Description

The invention relates to materials with special magnetic properties, more precisely to alloys with high magnetic permeability.

The known cast iron containing 1.75-2 carbon and 2.2-4 o / o silicon, to ensure high magnetic properties, must have a low content of sulfur and phosphorus (0.0080 / 0 and 0.050 / 0, respectively). Therefore, the production of such pig iron requires the use of charge materials with a low concentration of these elements.

A disadvantage of the known cast iron is an increased tendency to shrinkage defects and cracks during casting.

In order to increase the magnetic properties, it is proposed to cast iron to additionally alloy with aluminum in the following ratio of components (in o / o):

1.8-2.3

carbon 3.6-4.5

silicon 0.5-1.5

aluminum

up to 0.5

manganese

phosphorus

up to 0.15

up to 0.05

sulfur

iron

rest.

The alloy has a specific electrical resistance of 1.1-1.3 ohm-mm2 / m, an initial permeability of 250-300 gf / e, a maximum permeability of 1000-1,200 gf / e, a coercive force of 2.0-2.8 e. The tensile strength of cast iron is 28- 32 kg / mm, an elongation of 0.8-1.5 e / o. In the cast state, the alloy has a ferritic or ferritic-pearlitic structure with a meladendritic arrangement of graphite.

Subject invention

Magnetic soft iron containing carbon, silicon and manganese, characterized in that, in order to increase the magnetic properties, it is additionally doped with aluminum at

Wo):

o, the following ratio of components (in carbon 1.8-2.3

silicon3,6-4,5

aluminum0.5-1.5

manganese to 0.5

phosphorus 0.15

serado 0.05

iron ostal