Ferrovanadium Grades and Where They Are Used
Ferrovanadium is supplied mainly as FeV50 and FeV80, meaning roughly 50 percent and 80 percent vanadium by mass, with the balance largely iron and a small controlled amount of aluminium. The alloy is added to steel to raise strength through precipitation of vanadium carbonitride, to improve hardenability in tool and die steels, and to raise creep resistance in power plant steels. Specifications such as GB/T 4139 and ASTM A102 set the vanadium content, the aluminium, carbon, silicon and phosphorus limits and the size band. Because vanadium is added in very small amounts, typically 0.05 to 0.20 percent in high strength low alloy steel, the delivered cost of the alloy per kilogram matters less than the cost per kilogram of contained vanadium.
Feedstock: Vanadium Pentoxide and Vanadium Slag
The dominant feedstock is vanadium pentoxide, produced from vanadium bearing titanomagnetite ores or from oil residues and spent catalysts, and it is quoted internationally on a per pound of contained vanadium pentoxide basis. Vanadium bearing slag from steelmaking is the other major feed, and its vanadium content and impurity profile determine how much refining is needed. The pentoxide price is the single largest element of ferrovanadium cost and is the reason the alloy price tracks the oxide market closely, with a lag that reflects the time needed to convert and ship material. Buyers who watch the oxide quotation can usually anticipate the direction of the ferrovanadium market before published alloy assessments react.
Reduction Route and Conversion Cost
Most ferrovanadium is produced by aluminothermic reduction, in which vanadium pentoxide or a vanadium rich melt is reduced by aluminium, generating enough heat to produce a molten alloy and a calcium aluminate slag. Aluminium is therefore a significant consumable cost alongside the vanadium units, and the energy used for crushing, blending, melting and casting adds a further layer. The process yields a relatively low carbon product, which is important for steels that must remain free of carbon pickup, and it gives control over the residual aluminium that remains in the alloy. Plants that also operate electric furnaces may use a two stage route, and the route chosen influences both the carbon level and the cost of the finished alloy.
Comparing Offers on a Contained Vanadium Basis
A quotation for FeV50 and a quotation for FeV80 cannot be compared directly by weight. The correct comparison converts each offer to a cost per kilogram of contained vanadium by dividing the alloy price by its vanadium fraction, and then adds the cost of the extra alloy weight that has to be handled, stored and charged. FeV80 delivers more vanadium per kilogram shipped, so it reduces freight, packaging and handling cost per unit of vanadium, which is why it often shows a higher alloy price but a competitive vanadium price. Buyers should also account for recovery: the aluminium and carbon content of the alloy, and the size band supplied, influence how much vanadium actually dissolves in the steel.
Specification Limits That Justify a Premium
Grade premiums reflect the cost of meeting tighter limits. Low aluminium grades are needed where the steel specification restricts residual aluminium or where inclusions are a concern. Low carbon and low silicon grades are required for certain tool and special steels. Tight limits on phosphorus and sulphur, a controlled size band, low moisture, and dry packed material in sealed drums all add cost but reduce the risk of rework. For critical applications the buyer should ask for the certified analysis of the actual lot, confirm traceability to the production batch, and agree what happens if the vanadium content falls outside the stated band, since an out of specification lot can force a costly realloying correction in the steelmaking shop.
Frequently Asked Questions
Q: Why is ferrovanadium priced per kilogram of vanadium rather than per kilogram of alloy?
Because the useful element is vanadium, and FeV50 and FeV80 contain very different amounts of it, so only the contained vanadium basis allows a fair comparison between offers.
Q: What is the main feedstock for ferrovanadium?
Vanadium pentoxide is the dominant feedstock, supplemented by vanadium bearing slag, and the pentoxide price is quoted internationally per pound of contained vanadium pentoxide.
Q: What are the common ferrovanadium grades?
FeV50 and FeV80 are the standard commercial grades, containing about 50 percent and about 80 percent vanadium respectively, with controlled aluminium, carbon and silicon.
Q: How is ferrovanadium produced?
Most material is made by aluminothermic reduction of vanadium pentoxide, a route that gives low carbon content and controlled residual aluminium in the alloy.
Q: Does FeV80 cost more per kilogram than FeV50?
The alloy price is usually higher, but the cost per kilogram of contained vanadium can be lower once freight, packaging and handling are counted, because less material moves per unit of vanadium.
Q: Which limits drive a grade premium?
Low aluminium, low carbon, low silicon and tight phosphorus and sulphur limits, together with controlled sizing, dry packing and lot certification, all add conversion cost that appears as a premium.