Ferro Chrome
Your Professional Ferro Chrome Manufacturer
We are a professional manufacturer in Ferroalloy and Metal industries, we have many complete production lines! The factory covers an area of 95,000 square meters, Our common products are Silicon Metal, Ferro Silicon, Silicon Calcium alloy, Ferro Manganese, Silicon Manganese, Cored Wire, etc.
Why Choose Us
Our factory
We have our own processing factory and cooperate with many professional manufacturers to ensure the smooth production of products and product quality assurance.
Team Advantage
We have a professional management team to provide customers with product services and support in all aspects from production, sales, logistics, etc.
Production Scale
TF Industrial Co.,Ltd further expanded its factory scale and now has a complete modern production line consisting of 6 submerged arc furnaces and 10 intermediate frequency furnaces.
Sale Market
We have established long-term and stable cooperative relationships with customers in many countries and regions around the world, and our products are exported to Europe, North America, India, Japan and other places.
Classification of Ferro Chrome
Ferrochrome is divided into high-carbon ferrochrome according to different carbon content, including charging grade ferrochrome (C≦10%), medium carbon ferrochrome (C≦4.0%), low-carbon ferrochrome (C≦0.5%), and micro-carbon Ferrochrome (C≦0.15%), etc. Also commonly used are silicon-chromium alloys and ferrochromium nitrides. Ferrochrome is mainly used as an alloy additive for steelmaking, and it was added in the later stage of steelmaking in the past. To smelt low-carbon steels such as stainless steel, low-carbon and micro-carbon ferrochrome must be used, so the production of refined ferrochrome has been developed on a large scale. Due to the improvement of the steelmaking process, when the AOD method (see out-of-furnace refining) is used to produce stainless steel and other steel grades, carbon ferrochrome (mainly charging-grade ferrochrome) is used to charge the furnace, so it is only necessary to reduce the The composition of micro-carbon ferrochrome is adjusted, so now the focus of ferrochrome production is to make carbon ferrochrome.
Low carbon ferro chrome alloy is typically composed of 60-70% chromium, 1.5-2.5% carbon, and the remainder is iron and other elements. The carbon content of LCFC alloy is significantly lower than that of high carbon ferro chrome alloy, which typically contains 4-6% carbon. The low carbon content of LCFC alloy makes it more cost-effective and environmentally friendly than high carbon ferro chrome alloy.
One of the most significant properties of LCFC alloy is its high corrosion resistance. Chromium, the primary component of LCFC alloy, is highly resistant to corrosion and oxidation, making LCFC alloy ideal for use in harsh environments. LCFC alloy also has excellent wear resistance, making it suitable for use in high-wear applications.
Stainless Steel Production: One of the primary applications of ferrochrome is in the production of stainless steel. Chromium imparts stainless steel with corrosion resistance, strength, and durability, making it suitable for use in construction, automotive manufacturing, household appliances, and other sectors.
Alloy Production: Ferrochrome is also utilized in the production of alloy steels. Adding ferrochrome to steel alloys enhances their resistance to corrosion, oxidation, and wear, making them suitable for specialized applications in machinery, tools, and equipment.
Refractory Materials: Ferrochrome finds application in the manufacturing of refractory materials, which are resistant to high temperatures and chemical corrosion. These materials are essential for lining furnaces and other high-temperature industrial processes.
Chemical Industry: In the chemical industry, ferrochrome serves as a catalyst in certain chemical reactions, contributing to the production of various chemicals and intermediates.
The chemical composition of ferro chrome can vary depending on the specific grade and the intended industrial application. The percentage of chromium in ferro chrome typically ranges from 50% to 70% or more, depending on the grade. The carbon content is another significant factor, with high carbon, medium carbon, and low carbon ferrochrome grades available. Other alloying elements may include silicon (Si), aluminium (Al), and manganese (Mn), among others, depending on the specific requirements of the alloy being produced.
Specification of Ferro Chrome
|
Grade |
Chemical Composition% |
||||
|
Cr |
C |
Si |
P |
S |
|
|
≥ |
≤ |
||||
|
Low Carbon (LC FeCr) |
60.0 |
0.25 |
3.0 |
0.06 |
0.05 |
|
60.0 |
0.50 |
3.0 |
0.06 |
0.05 |
|
|
Medium Carbon (MC FeCr) |
60.0 |
1.0 |
3.0 |
0.06 |
0.05 |
|
60.0 |
2.0 |
3.0 |
0.06 |
0.05 |
|
|
60.0 |
4.0 |
3.0 |
0.06 |
0.05 |
|
|
High Carbon (HC FeCr) |
60.0 |
8.5 |
5.0 |
0.06 |
0.06 |
Smelting Method of Ferro Chrome
● Ferrochrome is an important raw material of stainless steel production, so it is mainly used in the field of stainless steel production, today to introduce the production of ferrochrome leaf bright method:
The medium, low and micro carbon ferrochrome is generally made of silicon-chromium alloy, chromite and lime as raw materials. The desilication is refined in an electric furnace with 1500~6000 kva and operated with high basicity slag (CaO/SiO2 is 1.6~1.8).Low - and micro-carbon ferrochrome is also produced by heat mixing on a large scale.Two electric furnaces are used in production, one to smelt the silicon-chromium alloy and the other to melt the slag composed of chromium ore and lime.
● The refining reaction is carried out in two stages in two buckets:
After the slag of slag furnace is injected into the first bucket, the silicon chromium alloy which has been preliminarily desilicated in the other bucket is added. Due to the large surplus of oxidant in slag and sufficient desilication, the micro-carbon ferrochrome with silicon content less than 0.8% and carbon content less than 0.02% can be obtained.
The first bucket after the reaction slag (containing About 15% Cr2O3) moved to the second bucket, the silicon chromium alloy (containing 45% silicon) made in the silicon chromium electric furnace is hot mixed into the slag, after the reaction to get a preliminary desilication of silicon chromium alloy (containing about 25% silicon), mixed into the first bucket for further desilication, the slag containing Less than 2~3% Cr2O3 can be abandoned.
Oxygen blowing method refining medium and low carbon ferrochrome, using liquid carbon ferrochrome as raw material, blowing into the molten pool to add a small amount of lime, fluorite slag, before adding silicon chromium alloy or ferrosilicon to recover the chromium in the slag.The blowing of micro - carbon ferrochrome is possible under a certain vacuum.
Vacuum solid decarburization refining, using finely ground high carbon ferric chromium as raw material, which is a part of the finely ground high carbon ferric chromium oxide roasting as an oxidant, with water glass or other adhesive, pressed into a mass, after low temperature drying, in the car type vacuum furnace, in the vacuum degree of 0.5~10 mm hg, temperature 1300~1400℃ heating reduction 35~50 hours,Microcarbon ferric chromium with carbon content less than 0.03% or even less than 0.01% can be obtained.
Selection Of Raw Materials In High Carbon Ferrochrome
The raw materials for smelting high carbon ferrochrome are chrome ore, coke and silica. Among them coke and silica are used as reducing agents.
Principle of beneficiation: Chromium is the most widely used metal and ranks first among the “strategic metals”. Today many countries are stepping up the study of chrome ore beneficiation, the normal selection methods are as follows:
Re-selection: Such as jigging, shaking table, spiral chute, heavy media cyclone, and so on.
Magnetic-election: Including high-intensity field magnetic separation, high voltage election.
Flotation and flocculation flotation.
Combined selection: Such as re-selection – magnetic selection.
Chemical beneficiation: Processing of very fine-grained poor chrome ore difficult to be selected.
Principle of chrome ore matching: In the actual production of high-carbon ferrochrome often needs to choose the right type of ore matching and matching ratio. The main principles of chrome ore matching are.
The appropriate chromium-iron ratio (Cr2O3/∑FeO): Generally speaking, smelting chromium content greater than 50% of the alloy required to enter the furnace integrated ore Cr2o3 / ∑ FeO ratio greater than 2.0; and smelting chromium content greater than 60% of the alloy requires that this ratio is greater than 2.6.
The appropriate MgO/Al2O3 ratio: It not only affects the conductivity of the slag and reducing properties but also affects the alloy's carbon disk. In actual production, the use of MgO/Al2O3, the ratio of low chrome ore needs to be matched with a sufficient amount of coke to increase the thickness of the coke layer, on the one hand, to ensure that the bottom of the furnace is not easy to damage, on the other hand, it is also to increase the unreduced ore nuclei in the coke layer of the retention time. Reduce the chromium running in the slag.
Suitable block size matching: When using powdered ore alone, it is easy to cause powdered ore sintering, which makes the material surface less permeable and seriously damages the smelting atmosphere; the use of chrome ore with a large block size is easy to increases the thickness of the refining layer, resulting in a low carbon content of the alloy.
Suitable melting performance: Simply using fusible chrome ore will cause slag too early, so that the melting speed is faster than the reduction speed, easily causing the slag to run high chromium phenomenon; Simply using refractory chrome ore will thicken the refining layer, a large number of unreduced nuclei and the alloy carbon content is low and other phenomena, the normal smelting has brought great difficulties. Reasonable matching of chrome ore so that the slag has a reasonable melting point, it is very important to improve the economic indicators.
Ferrochrome is an alloy comprised of iron and chromium used primarily in the manufacturing of stainless steel. The chemical substance can be stored in the following containing systems:
Octo-Box containers
Steel or fiber drums
Multiple paper bags
Bulk bags
Pails
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