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Ferrosilicon

Ferrosilicium, or ferrosilicon – it is an alloy of silicon and iron is used as a deoxidant of steel and for alloying thereof. Ferrosilicon is used as a deoxidizing agent in different alloys and metals production by way of silicon reduction.

It is broadly used smelting of spring steels, heat-resistant and rust resisting steels, electrotechnical steels, thermite mixtures.

Silicon that is included in ferrosilicon contributes to increasing of ultimate stress limit, plasticity and resilience. It also reduces impact value and improves an oxidative stability. Silicon steel is widely used in shock absorber springs, and electrical transformer steel with silicon is a beautiful base for electrotechnical goods production.

The following shows how ferrosilicon influences upon steels:

it increases hardness penetration;

it normalizes annealing temperature;

it improves hardness and strength;

it reduces plasticity;

it increases oxidation resistance grade.

it increases the grain dimension of the material, the more substance, the better grain fineness;

There is about 0,35% of Si in steel mostly. Is there more of silicon, the steel can be determined as an extrinsic silicon composition.

1.30–2% of Si. Such percentage increases elasticity limit and flow index. It also increases compressibility and expansive properties during a high impact resistance. Such a percentage of the ferrosilicon allows to get constructional steel.

2.5–4.2% Si and carbon less than 1%. The main characteristic feature is a low magnetics level which allows to use it in electric generators and transformers production.

This alloy is used to increase material strength properties of readymade steel. It also an effective deoxidant and alloying addition of different alloys. Due to this component material is heat and rust resistant, elasticity and flow strength, as well as a resistance to tensile strain.

Different silicon content:

FeSi 45

FeSi 58

FeSi 65

FeSi 70

FeSi 75

Granulometry

Fractions: 0–5 mm, 10–50 mm, 10–80 mm, 10–100 mm, 0–300 mm.

Granulometry of ferrosilicon should correspond to the grain size category from the table below:

Grain-size fraction	Size of pieces of ferrosilicon, mm	Mass fraction of pieces in order of size in a shipment, %		The maximum size of oversize lumps for the average measurements in three dimensions, mm
		no more than
		oversized	undersized
1	From 20 to 200 inclusive	10	10	300
2	From 20 to 100 inclusive	10	10	200
3	From 5 to 100 inclusive	10	10	200
4	From 5 to 50 inclusive	10	10	100
5	From 5 to 25 inclusive	10	15	50
6	From 1 to 300 inclusive	10	–	350

Chemical parameters:

Alloy grade	Mass / weight percentage, %
	Silicon	Carbon	Sulphur	Phosphorus	Aluminium	Manganese	Chrome
	Silicon	No more
FeSi 75	over 74 « 80 «	0,2	0,02	0,05	3,0	0,5	0,5
FeSi 70	over 68 « 74 «	0,2	0,02	0,05	2,5	0,5	0,5
FeSi 65	from 63 « 68 «	0,2	0,02	0,05	2,5	0,5	0,5
FeSi 45	from 41 « 47 «	0,2	0,02	0,05	2,0	1,0	0,5