Classification of Chromite

1.High carbon ferro-chrome

The chromium content of high-carbon chromium iron is generally around 50% to 60%, with a relatively high carbon content, usually ranging from 4% to 8%. It is mainly used to produce some steels that do not have strict requirements for carbon content, such as some low-alloy steels. The production process of high-carbon chromium iron is relatively simple and has a lower cost. For example, when producing some common building steel, adding high-carbon chromium iron can increase the hardness and wear resistance of the steel, making it more suitable for manufacturing the stressed components in building structures.

2.Low-carbon ferrochromium

Low-carbon ferrochrome has a chromium content of approximately 50% to 60%, but its carbon content is relatively low, usually less than 1.5%. Its production cost is higher than that of high-carbon ferrochrome because it requires a special smelting process to reduce the carbon content. Low-carbon ferrochrome is mainly used in the production of some steels with strict requirements for carbon content, such as stainless steel. In the production of stainless steel, adding low-carbon ferrochrome can ensure the corrosion resistance of the steel because excessive carbon will combine with chromium to form chromium carbide, thereby reducing the effective chromium content in the steel and affecting the corrosion resistance of stainless steel.

3.Micro-carbon ferro chrome

The chromium content of micro-carbon chromium iron ranges from 50% to 60%, and its carbon content is extremely low, generally less than 0.05%. This type of chromium iron is mainly used in the production of some steel with special requirements, such as some high-purity stainless steel. In the production of some high-end medical device steel, micro-carbon chromium iron is required because these steel products need to have extremely high corrosion resistance and good biocompatibility. Micro-carbon chromium iron can ensure that the performance of the steel meets the requirements.

The application of chromite

1.Application in steelmaking

Chromium iron is an important alloy additive in the steel-making process. Chromium is a highly oxidizing element that can enhance the oxidation resistance and corrosion resistance of steel. For instance, when producing stainless steel, the addition of chromium iron usually accounts for about 10% to 20% of the total weight of the steel. Chromium can form a dense chromium oxide layer, which can prevent the iron elements inside the steel from coming into contact with the corrosive media outside, thus providing protection. At the same time, chromium can also improve the hardenability of steel, allowing the steel to obtain a deeper hardened layer after quenching, thereby increasing the strength and hardness of the steel. In the production of some alloy tool steels, adding chromium iron can enhance the wear resistance of the steel, making it more suitable for manufacturing cutting tools, etc.

2.Application in casting

Chromium iron is also used in the casting industry. When producing some wear-resistant cast iron parts, such as grinding balls and grinding discs, adding chromium iron can increase the hardness and wear resistance of the cast iron. For example, high-chromium cast iron contains a relatively high chromium content (generally around 10% - 30%), and its hardness can reach HRC 50 - 65, with excellent wear resistance. It is widely used in grinding equipment in industries such as mining and cement.