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Carbon Content in Different Types of Ferro Chrome
Ferrochrome is an iron alloy composed of chrome and iron, and is an important alloying additive for steelmaking. According to different carbon content, ferro chrome can be divided into high carbon ferrochrome (4~8% carbon), medium carbon ferrochrome (0.5~4% carbon), low carbon ferrochrome (0.15~0.50% carbon) , micro-carbon ferrochrome (carbon content is 0.06%), ultra-micro-carbon ferrochrome (carbon content is less than 0.03%), metal chromium, silicon-chromium alloy, ferrochromium nitride, etc.
Ferrochrome is mainly used as an alloy additive for steelmaking, and low-carbon and micro-carbon ferrochrome must be used to smelt stainless steel and other low-carbon steels, so the production of refined ferrochrome was once developed on a large scale.
Medium, low, and micro-carbon ferrochrome generally use silicon-chromium alloy, chromite and lime as raw materials. They are refined and desiliconized in a 1500-6000 kVA electric furnace, and are operated with high-basic slag (CaO/SiO2 is 1.6-1.8). Low-carbon and micro-carbon ferrochromium is also produced on a large scale by the heat transfer method. During production, two electric furnaces are used, one for smelting silicon-chromium alloy and the other for melting slag composed of chromium ore and lime.
Oxygen blowing method is used to refine medium and low carbon ferrochrome, using liquid carbon ferrochrome as raw material, adding a small amount of lime and fluorite to the molten pool during blowing to form slag, and adding silicon chromium alloy or ferrosilicon to recover the slag before iron tapping chromium. The blowing of micro-carbon ferrochrome is only possible under a certain degree of vacuum.
Vacuum solid-state decarburization refining, using finely ground high-carbon ferrochrome as raw material, wherein a part of the finely ground high-carbon ferrochrome is oxidized and roasted as an oxidant, mixed with water glass or other binders, pressed into agglomerates, and subjected to low temperature After drying, heat reduction for 35 to 50 hours in a vacuum furnace with a vacuum degree of 0.5 to 10 mmHg and a temperature of 1300 to 1400 ° C to obtain micro carbon with a carbon content of less than 0.03% or even less than 0.01%. ferrochrome.
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