PRODUCTS

NICHROME

FECRAL

NICHROME WITH INSULATION

TITANIUM

TUNGSTEN

MOLYBDENUM

COBALT

THERMOCOUPLES

HEAT-RESISTING THERMOCOUPLES

NICKEL

MONEL

CONSTANTAN

CUPRONICKEL

HARD ALLOYS

METAL POWDERS

STAINLESS STEEL

HEAT-RESISTANT ALLOYS

FERROALLOYS

TIN

TANTALUM

NIOBIUM

VANADIUM

CHROMIUM

RHENIUM

PRECISION ALLOYS

ZIRCONIUM


 
Attention! If you found an error on the site please select it and press Ctrl + Enter.

 

+7 (495) 366-00-24 logo
+7 (495) 366-00-24
e-mail: metoteh@gmail.com

Ferrotungsten

This ferroalloy plays a very important role in industrial production. It is essential for melting high-speed and instrument steel that are subject to high stress (as well as under high temperatures). Tungsten in ferroalloy form added to steel during melting improves its properties significantly.

Metotechnics offers ferrotungsten. It can be ordered on the Prices page, via e-mail or by phone.

See the corresponding sections of this page for the product grades, production methods and application recommendations.

Grades

According to ferroalloy designation principles, the ferrotungsten grade should begin with Fe. Tungsten (W) is the main element. The number in the grade means its percentage. Other letters that can be present mean the content of other chemical elements.

Examples of ferrotungsten grades: FeW80(а), FeW75(а), FeW70, FeW65. The number means the minimum W content (%). Also, the described ferroalloys always contain a slight amount of molybdenum (Mo) as this element is present in ore materials. Thus, the Mo content in the above-mentioned grades is 6%, 7%, 2% and 6% correspondingly. Letter (а) means that the material contains aluminum. Its percentage depends on the grade and varies from 3 to 6%. Iron (Fe) is an essential part of all ferroalloys including ferrotungsten. Its amount is not regulated.

The most adverse admixtures are sulphur (S) and phosphorus (P). Their amount is rather small (basis point). The content of carbon (C) and manganese (Mn) is higher.

Ferrotungsten chemical composition is regulated by GOST 17293-93.

Production

Ferrotungsten so as other ferroalloys are reduced. Aluminum (A), carbon (C) and silicon (Si) can be used as reducing reagents.

Tungsten (W) content in the Earth crust is rather low. Usually, tungsten minerals contain 0.5-1% of tungsten oxide (WO3), but not more than 3%. As W percentage in the ore is rather small, it can not be used for melting ferroalloys directly. Previously it is dressed for making a tungsten concentrate that contains 55-65% of WO3. It serves as primary raw materials for further FeW melting.

Usually, metallic minerals are used for dressing:
  • wolframite (Fe, Mn)WO4 - with a high content of manganese oxides (MnO) and iron oxides (FeO);
  • scheelite CaWO4 - calcium oxide (CaO);
  • molybdenum scheelite Ca(W, Mo)O4 - calcium oxide (CaO) and molybdenum oxide (MoO).
There are several industrial methods of melting ferrotungsten. The most common are:
  • “block” smelting;
  • melting with alloy scooping-out.
The first method involves two electric furnaces that consume a lot of electricity, but the amount of extracted tungsten is rather low, if compared with the second technology. The first method allows making solid ferrotungsten blocks that are subject to further grinding.

For implementing the second method three-phase electric furnaces with a rotating bath are applied. A special machine with steel spoons is used for alloy scooping-out. This allows making ferrotungsten ingots that are subject to further grinding for making slugs.

FeW is supplied in form of slugs or ground screened particles with sizes that depend on the alloy class.

Supply condition, batch selection principles and other requirements toward ferrotungsten are given in GOST 17293-93.

Application

Ferrotungsten main application (so as of most ferroalloys) is alloying steel and alloy building. So useful properties of tungsten are transited to melted materials. Refractoriness and hardness are the most peculiar W properties. They allow increasing the material high-temperature strength so as other mechanical properties (as well as under high temperatures). This is especially important for making high-speed and other instrument steel.

Prices

See the Cost page for availability of certain ferrotungsten grades, forms and prices.

"Metotechnics"
e-mail: metoteh@gmail.com

Tel:
+7 (495) 366-00-24

Nichrome :: Fecral :: Nichrome with insulation :: Titanium :: Tungsten :: Molybdenum :: Cobalt :: Thermocouples :: Heat-resisting thermocouples :: Nickel :: Monel :: Constantan :: Cupronickel :: Hard alloys :: Metal powders :: Stainless steel :: Heat-resistant alloys :: Ferroalloys :: Tin :: Tantalum :: Niobium :: Vanadium :: Chromium :: Rhenium :: Precision alloys :: Zirconium