Ferro Alloys

Ferro Alloy serves as an important source of various metallic elements in the production of alloy steels. The principal bulk Ferro Alloys used in steel making are Ferro Manganese(FeMn), Ferrochromium(FeCr), Ferrosilicon (FeSi), Silico Manganese(SiMn). These are brittle and unsuitable for direct use in fabricating products but they are useful sources for the alloy steels. Ferro alloys usually have lower melting ranges than the pure elements and can be incorporated more readily in the liquid steel. They are added to liquid steel to achieve a specified chemical composition and provide properties to achieve the desired degree of corrosion resistance, heat resistance, tensile strength, yield strength and other qualities which are needed to make the particular product as per standards.

Ferro Manganese

Ferro Manganese is used mainly to counteract the bad effects of sulphur. It imparts metallurgical properties such as increased strength, hardness, toughness and hardenability. High - manganese alloys provide a favourable combination and balance of properties like ductility, formability, strain hardening, and strength level parameters which enables reducing the weight of vehicles and at the same time improves resistance against the effects of accidents.

Steel usually contain from 0.2 % to 2 % Mn depending on grades as Mn is the cheapest alloying element among those which enhances some key mechanical properties like strength and toughness. In the specific case of stainless steel it can substitute expensive nickel in some austenitic grades called 200 series.

Silicon Manganese

Silicon manganese is a chemical compound made by mixing natural silicon with manganese, an element found naturally on the earth. When combined, these elements can be used to produce a number of specialty steel alloys. Silico manganese enhances the natural properties of steel, giving it increased strength and function as well as improved aesthetic appeal.

Silico Manganese may be used alone or combined with other substances to create various alloys. The ratio of silicon to manganese can also be adjusted to provide steel the desired properties. Standard silicon manganese steel alloys contain 14 % - 16 % silicon and as much as 68 % manganese. They also include small amounts of carbon, which is required for the steel to undergo a chemical reaction with these compounds. In making stainless / specialty steel products, the silicon content can be as high as up to 30 %.

Ferro Silicon

Ferrosilicon is a Ferro Alloy - an alloy of iron and silicon. It contains a high proportion of iron silicides. Ferro Silicon is produced by reduction of silica or sand with coke in presence of iron.

Ferro Silicon is known to possess good resistance to abrasion, good resistance to corrosion, high specific gravity, and high magnetism that allows easy magnetic recovery. The melting point and density of Ferro Silicon depends on its silicon content.

Ferro Chrome

Ferro chrome is manufactured by conducting carbothermic reduction of Iron Magnesium Chromium oxide under high temperatures. Iron-chromium alloy is produced by the reduction of Chromium Ore by the application of coal and coke. This reduction process requires heat which comes from the electric arc of the furnace.

Most of the ferrochrome produced worldwide is used in manufacturing stainless steel. The chromium content present in stainless steel provides resistance to corrosion as well as gives stainless steel its customary appearance. Around 18% of chrome is used in per unit content of stainless steel.

Ferro Chrome is also used when more chromium is needed to be added to carbon steel.

High carbon Ferro Chrome is used in the manufacturing of ball-bearing steels, tool steels as well as other alloy steels.

High Carbon Ferromanganese Chemical Composition
Grades (%)
Mn C Si S P
(min)   (max) (max) (max)
(i) 65 6 - 8 1.5 0.05 0.25
(ii) 70 6 - 8 1.5; 0.05 0.25
(iii) 73 6 - 8 1.2 0.05 0.25
(iv) 75 6 - 8 1.5 0.05 0.25
(v) 76 6 - 8 1.5 0.05 0.25

High Carbon Silicomanganese Chemical Composition
Grades (%)
Mn Si C S P
(min) (min) (max) (max) (max)
(i) 40 10 3.5 0.05 0.25
(ii) 50 12 3.5 0.05 0.25
(iii) 60 14 2.5 0.05 0.25
(iv) 65 15 2.0 0.05 0.25
(v) 65 16 2.0 0.05 0.25

Medium Carbon Silicomanganese
Grades (%)
Mn Si C S P
(min) (min) (max) (max) (max)
(i) 53 21 - 22 0.5 0.15 0.03
(ii) 55 22 0.5 0.05 0.25

Medium Carbon Silicomanganese
Grades (%)
Mn Si C S P
(min) (min) (max) (max) (max)
(i) 55 25 0.20 0.10 0.01
(ii) 55 27 0.10 0.15 0.03