Brief introduction:
Low carbon ferrochrome is a type of chromium iron alloy, mainly composed of chromium (Cr) and iron (Fe), with extremely low carbon (C) content (usually ≤ 0.10%), used in stainless steel, special steel, and other high value-added metallurgical products to meet strict low-carbon requirements.
Chromium is a lustrous gray metal with a density of 7.2, a melting point of 1857 ℃, a boiling point of 2672 ℃. It has ductility, but becomes hard and brittle when it contains impurities such as oxygen, hydrogen, carbon and nitrogen. The chemical property of chromium is not active, and it is stable to oxygen and water vapor at room temperature. Chromium reacts with oxygen when it is higher than 600 ℃. However, when the surface is naturally oxidized, the reaction will be slow. When heated to 1200 ℃, the oxide film will be destroyed and the reaction will be faster again. At high temperature, chromium reacts with nitrogen, carbon and sulfur. Chromium can react with fluorine at room temperature. Chromium can be dissolved in hydrochloric acid, sulfuric acid and perchloric acid. It will be passivated in nitric acid and will not react with acid. Chromium can form alloys with magnesium, titanium, tungsten, zirconium, vanadium, nickel, tantalum and yttrium. Chromium and its alloys have strong corrosion resistance.
L C Ferro Chrome is a ferro-alloy used to regulate the ratio of Chromium in steel production without Carbon and other unwanted ingredients. Due to high quality it is a reliable and economical alternative instead of metallic Chromium in Superalloy production.
Smelting L C Ferro Chrome by electro silicothermic process
Smelting medium and L C Ferro Chrome by electric silicothermic process is carried out in a fixed three-phase electric arc furnace. Self baking electrode can be used, and the furnace lining is made of magnesia brick (dry masonry). Short lining life is an important problem in the production of medium and low carbon ferrochrome. Due to the high smelting temperature (up to 1650 ℃), the lining life is generally short.
The raw materials for smelting medium L C Ferro Chrome include chromite, silicon chromium alloy and lime. Chromium ore should be dry and pure lump ore or concentrate powder. The higher the content of Cr2O3 is, the better, and the lower the impurity content, the better. The phosphorus content in chromite should not be more than 0.03%, and the particle size should be less than 60mm. The silicon chromium alloy should be broken with particle size less than 30mm without slag. The lime should be newly fired and its CaO content should not be less than 85%.
USE
* Adding chromium into steel can significantly improve its oxidation resistance and corrosion resistance.
* Low carbon ferrochrome is used in the production of medium and low carbon structural steel, carburized carbon steel, manufacturing gear, high pressure blower blade, valve plate and so on.
* Low carbon ferrochrome is used in the production of stainless steel, acid resistant steel, heat resistant steel and electrothermal alloys.
|
model |
Chemical composition(%) |
||||||||
|
Cr |
C |
Si |
P |
S |
|||||
|
I |
II |
|
I |
II |
I |
II |
I |
II |
|
|
≥ |
≤ |
||||||||
|
FeCr55C0.5 |
60.0 |
52 |
0.5 |
1.5 |
3.0 |
0.04 |
0.06 |
0.04 |
0.06 |
|
FeCr55C0.25 |
60.0 |
52.0 |
0.25 |
1.5 |
3.0 |
0.04 |
0.06 |
0.04 |
0.06 |
|
FeCr55C0.15 |
60.0 |
52.0 |
0.15 |
1.5 |
2.0 |
0.04 |
0.06 |
0.04 |
0.06 |
|
FeCr55C0.1 |
60.0 |
52.0 |
0.10 |
1.5 |
2.0 |
0.04 |
0.06 |
0.04 |
0.06 |
|
FeCr55C0.06 |
60.0 |
52.0 |
0.06 |
1.5 |
2.0 |
0.04 |
0.06 |
0.04 |
0.06 |
|
FeCr55C0.03 |
60.0 |
52.0 |
0.03 |
1.5 |
2.0 |
0.04 |
0.06 |
0.04 |
0.06 |
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