This ferroalloy plays a great role in material industrial production. Molybdenum is added to many structural, heat-resistant and heatproof alloys improving their properties.
Metotechnics Company offers ferromolybdenum. For ordering it call us, send a request via e-mail or make an order on the website on the Price list page.
The detailed description of methods of making these products, their grades and application recommendations are given in the corresponding sections of this page. Also, it contains links to standards that serve as important sources of technical information.
Grades
Grades of ferromolybdenum (so as other ferroalloys) contain Fe. Mo is the main element. The numbers after the letters mean the Mo percentage in the alloy.
The standard regulates several ferromolybdenum grades with different Mo percentage: FeMo60, FeMo58, FeMo55, FeMo50. Molybdenum percentage for these grades is at least 60%, 58%, 55% and 50% correspondingly. All ferroalloys of this type contain a small content of tungsten (W) (less than 1%). This is related to the presence of this component in molybdenum ore. Iron (Fe) is an important ferromolybdenum component so its content is rather high (standards do not regulate its content).
The most significant admixtures are silicon (Si) and sulphur (S). The first one is Mo reducing reagent, the second one is included in most molybdenum ores that serve as the primary raw materials for FMo production.
Ferromolybdenum chemical composition is given in GOST 4759-91.
Molybdenum is a rare metal, its content in natural resources is relatively low. Ores with more than 0.2% are suitable for production needs. Molybdenum concentrate serves as the primary raw materials for producing ferromolybdenum. It is made by ore flotation dressing and further sweet roasting for extracting molybdenum oxide (MoO3). MoO3 content in concentrates is 45-58%.
The following metallic minerals are usually used for dressing:
MoS2 molybdenite; - has a high content of manganese (MnO) and iron oxides (FeO);
copper-molybdenum ores - about 0.7% of copper and 0.01% of molybdenum.
Ladle silicothermal melting is the most common industrial method of ferromolybdenum production. FeSi75 ferrosilicon (with silicon as the main element) and partially aluminum serve as reducing reagents. A furnace is not used as a lot of heat is generated during the reduction. For increasing this energy required for melting aluminum powder is added to the burden that can be replaced with silicoaluminum (38-40% of Si, 60-62% of Al) or aluminum ferrosilicon. The burden also includes molybdenum concentrate from which Mo is reduced; iron ore and steel cuttings that serve as Fe source; fluor spar for liquefying silica that is formed during reducing molybdenum oxides and lime. The product is melted in a cylindrical smelting shaft lined with fire-clay brick. As a result, a block is formed that is ground further.
If needed, refining remelting is made in arc-type furnaces for improving the ferromolybdenum quality.
FeMo is supplied in form of slugs or ground screened particles with size depending on the alloy class.
The supply condition, batch selection principles and other requirements to ferromolybdenum are given in GOST 4759-91.
Application
Ferromolybdenum is mostly used in ferrous metallurgy as Mo is an important alloying agent for many steel, cast irons and alloys. Molybdenum is distributed for producing corresponding materials as follows: alloyed steel - 44%, corrosive-resistant stee - 8%, cast iron and steel rolled products - 6%, ultrastrong and special alloys - 3%, molybdenum - 6%, chemical compounds - 10%, other - 1%.
Molybdenum significantly improves the material mechanical properties so as increases corrosive stability, high-temperature strengthand wear resistance.
Prices
The Cost section includes ferromolybdenum prices and the list of grades available for ordering by phone or on the website.