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What is the role of low carbon ferro chrome?

Release Time: 2024-03-19
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The chromium content of low carbon ferro chrome can range from approximately 12% to 42%, depending on the type of product. For example, the chromium content of Cr15 low carbon ferro chrome is about 12% to 16%, while the chromium content of Cr40 low carbon ferro chrome is about 38% to 42%.


Low carbon ferro chrome is an iron alloy composed of iron and silicon. Low carbon ferro chrome is an iron-silicon alloy made of coke, steel chips, quartz (or silica) as raw materials and smelted by electric furnace. Since silicon and oxygen are easy to combine into silicon dioxide, low carbon ferro chrome is often used as a deoxidizer in steelmaking, due to the release of a lot of heat when SiO2 is generated, at the same time, it is also beneficial to improve the temperature of molten steel. At the same time, low carbon ferro chrome can also be used as alloying element additive, widely used in low alloy structural steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel, low carbon ferro chrome in ferro alloy production and chemical industry, commonly used as reducing agent.


Application of low carbon ferro chrome in various industries

(1) Used as deoxidizer and alloying agent in steelmaking industry.

In order to obtain the chemical composition of qualified steel and ensure the quality of steel, in the final stage of steelmaking must be deoxidized, the chemical affinity between silicon and oxygen is very large, so low-carbon ferrochrome is a strong deoxidizer for precipitation and diffusion in steelmaking. Adding a certain amount of silicon to steel can significantly improve the strength, hardness and elasticity of steel, so when smelting structural steel (containing silicon 0.40-1.75%), tool steel (including SiO.30-1.8%), spring steel (including SiO.40-2.8%) and transformer silicon steel (containing silicon 2.81-4.8%), Low carbon ferro chrome is also used as an alloying agent.

At the same time, improving the shape of inclusions and reducing the content of gas elements in molten steel is an effective new technology to improve steel quality, reduce cost and save iron. It is especially suitable for continuous casting steel deoxidation requirements. Practice has proved that low-carbon ferro chrome not only meets the deoxidation requirements of steelmaking, but also has desulfurization performance and has the advantages of heavy ratio and strong penetration.


In addition, in the steelmaking industry, the use of low carbon ferro chrome powder at high temperature can release a lot of heat, which is often used as ingot cap heating agent to improve the quality and recovery of ingot.


(2) Used as inoculant and nodulator in the cast iron industry.

Cast iron is an important metal material in modern industry, it is cheaper than steel, easy to melt and smelt, has excellent casting performance and much better earthquake resistance than steel. In particular, ductile iron, its mechanical properties reach or approach the mechanical properties of steel. Adding a certain amount of low-carbon ferro chrome to cast iron can prevent the formation of carbides in iron, promote the precipitation and spheroidization of graphite, so in the production of ductile iron, low-carbon ferro chrome is an important inoculant (to help precipitate graphite) and spheroidization agent.


(3) Used as a reducing agent in the production of ferro alloy.

Not only the chemical affinity between silicon and oxygen is very large, but also the carbon content of high-silicon low-carbon ferro chrome is very low. Therefore, high silicon and low carbon ferro chrome (or silicon alloy) is a common reducing agent in the ferroalloy industry when producing low carbon ferro alloys.


75# low carbon ferro chrome is often used in the high temperature smelting process of magnesium metal in the Pijiang process, replacing the magnesium in CaO.MgO, and consuming about 1.2 tons of low carbon ferro chrome per ton of magnesium metal, which plays a great role in the production of magnesium metal.


(4) For other purposes.

The low carbon ferro chrome powder, which has been milled or atomized, can be used as a suspended phase in the mineral processing industry. In the welding rod manufacturing industry can be used as welding rod coating. High silicon and low carbon ferro chrome can be used in the chemical industry to make products such as silicone.


Among these uses, the steelmaking industry, the casting industry and the ferro alloy industry are large users of low-carbon ferro chrome. Together, they consume more than 90% of the low carbon ferro chrome. In a variety of different grades of low-carbon ferro chrome, the most widely used is 75% low-carbon ferro chrome. In the steelmaking industry, about 3-5 kg 75% low-carbon ferro chrome is consumed per 1T of steel produced. Low carbon ferro chrome is widely used in steel industry, casting industry and other industrial production.


Low carbon ferro chrome content index

  1. Chromium content

The chromium content in low-carbon ferro chrome is one of its most important components, usually in the form of chromium oxide. According to different types of low-carbon ferro chrome products, the chromium content requirements are also different. In general, the content of chromium in low-carbon ferro chrome should not be less than 60%.


  1. Carbon content

Low-carbon ferro chrome has a lower carbon content, usually less than 0.05%. The level of carbon content directly affects the strength and toughness of low-carbon ferro chrome. In the production process of low-carbon ferro chrome, the amount of carbon added should be strictly controlled to ensure the performance of the product.


    3. Phosphorus and sulfur content

Phosphorus and sulfur are harmful elements in steel smelting, and the lower the content, the better the performance of steel. In low-carbon ferro chrome, the content of phosphorus and sulfur should be lower than 0.03% and 0.02%, respectively. In order to achieve this standard, it is necessary to strictly control the composition of raw materials and smelting process in the smelting process.


  1. Residue content

Residue refers to impurities that are not completely dissolved in the smelting process, including lime, dolomite, etc. Low carbon ferro chrome with high residue content will affect the quality and performance of the product. Therefore, the content of residue should be reduced as much as possible in the production process to ensure the purity of the product.

In short, the content index of low-carbon ferro chrome includes chromium, carbon, phosphorus, sulfur and residue components. The content of these ingredients should be strictly controlled in the production process to ensure the quality and performance of the product.


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