Chromium silicon

Used as a deoxidizer (instead of ferrosilicon) and chromium additive in steelmaking. Generally, it contains Cr>30%, Si>35%, and the remaining amount is iron and a small amount of impurities. Classification based on carbon content, such as carbon content ≤ 0.06%, ≤ 0.10%, ≤ 1.0%, etc. 

Alloys of iron, chromium, and silicon with a chromium content of not less than 30.0% and a silicon content of not less than 35.0%. The production process is divided into two types: one-step method (usually referred to as "slag method" or "ore method") and two-step method (usually referred to as "slag free method"). The raw materials used for one-step smelting include silica, chromium ore, and coke. The raw materials used for two-step smelting include silica, carbon chromium iron, and steel filings. Both smelting methods use coke as a reducing agent.

Due to the phase composition of silicon chromium alloy determining the carbon reduction effect outside the furnace, the Si content in silicon chromium alloy is generally controlled to be greater than 40% in industrial production. The silicon chromium alloy produced from the furnace generally has a C content of 0.2-0.8%, which is difficult to use directly. It must undergo external carbon reduction treatment, and the C content of the alloy can be reduced to below 0.02%. Different grades of silicon chromium alloy can be refined according to user requirements. In addition, ferrosilicon is added to liquid high carbon ferrochromium to produce silicon chromium alloys.

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