Overview and Properties
Ferrotungsten is used as an additive for tungsten in steelmaking and casting. Tungsten is one of the most important alloying elements in the production of special steel. Tungsten can not only reduce the elongation of steel to a small extent, but also increase the strength limit and yield point of steel, and improve the hardness and wear resistance of steel. Of particular importance is the good influence of tungsten on the high-temperature mechanical properties of steel, which improves heat resistance and tempering stability.
Production Method
The most common method of producing ferrotungsten is the agglomeration method, which uses carbon to reduce the oxides in the concentrate in an electric furnace and then removes the solidified metal blocks from the furnace. There are also iron extraction methods and the thermite method.
Delivery Quality Specifications
Ferrotungsten is delivered in blocks with a block size ranging from 10 to 130 mm; the amount of broken pieces below 10 by 10 mm should not exceed 5 percent of the total weight of the batch. The maximum size of individual blocks allowed in one direction is 150 mm. The surface of the tungsten iron block should be smooth and clean, with no obvious non-metallic inclusions and rust spots on the cross section and surface.
Required Testing Elements
The elements that must be measured in ferrotungsten are the content of W, C, P, S, Si, and Mn; the rest are guaranteed elements.
Frequently Asked Questions
What does tungsten do in special steel? It increases strength limit, yield point, hardness, wear resistance, and high-temperature properties.
How is ferrotungsten produced? Mainly by the agglomeration method, reducing concentrate oxides with carbon in an electric furnace.
What is the delivery block size? 10 to 130 mm, with broken pieces below 10 by 10 mm not exceeding 5 percent of the batch weight.
Q: Why is tungsten one of the most important alloying elements in special steel?
Tungsten increases the strength limit and yield point of steel, improves hardness and wear resistance, and has a particularly good influence on high-temperature mechanical properties, improving heat resistance and tempering stability.
Q: How is ferrotungsten most commonly produced?
The most common method is the agglomeration method, which uses carbon to reduce the oxides in the concentrate in an electric furnace; iron extraction and thermite methods also exist.
Q: What is the delivery block size specification of ferrotungsten?
Ferrotungsten is delivered in blocks of 10 to 130 mm; broken pieces below 10 by 10 mm should not exceed 5 percent of the total batch weight, and the maximum size in one direction is 150 mm.
Q: Which elements must be measured in ferrotungsten?
The content of W, C, P, S, Si, and Mn must be measured; the rest are guaranteed elements.
Q: What surface quality is required for ferrotungsten blocks?
The surface should be smooth and clean, with no obvious non-metallic inclusions and rust spots on the cross section and surface.
