Chromium is the most important raw material for stainless steel, mainly used in the production of stainless steel, ball bearing steel, tool steel, nitrided steel, heat strength steel, injection steel, carbon steel, and hydrogen resistant steel. Because chromium is the decisive factor in determining the element of stainless steel, that is, high carbon chromium iron powder, each stainless steel must contain a certain amount of chromium.

Nickname: High carbon chromium, also known as large eye chromium

Natural attributes: Natural blocks, each weighing no more than 15 kilograms, and chromium iron blocks weighing no more than 5% of the total weight of chromium.

Number: High chromium, with 50% chromium content as the reference unit for evaluation

Attention: Material, particle size (chromium iron is used as a reference unit for evaluation).

Application field: The corrosion resistance of stainless steel mainly comes from chromium. Experiments have shown that when chromium content exceeds 12%, only the corrosion resistance of steel is greatly improved, so the amount of chromium in stainless steel is usually not less than 12%. Therefore, the supply and demand of chromite is closely related to the supply and demand situation of the stainless steel market.

High carbon chromium iron powder is mainly used for the production of stainless steel, with stainless steel from 200 channels containing about 16% chromium, 300 strands containing about 25% chromium, and 400 stainless steels containing about 14% chromium. The 300 series stainless steel has the largest proportion of products with the highest chromium content among stainless steels.

Used as an alloying agent for high carbon ball steel, tool steel, and high-speed steel, it improves the hardenability of the steel, increases its wear resistance and hardness; Used as an additive for cast iron to improve its wear resistance and hardness, cast iron has good heat resistance; A chromium containing demolding method for producing chromium containing raw materials, used as a silicon chromium alloy and medium, for low and micro carbon chromium iron; Used as a chromium containing material for the production of metallic chromium; Used as a raw material for smelting stainless steel using oxygen blowing method.

Smelting process: High carbon ferrochromium smelting methods include blast furnace method, electric furnace method, and plasma furnace method. The use of blast furnaces can only be produced using special pig iron and special pig iron. As of 2012, the majority of high carbon chromium containing high chromium was melted in ore furnaces.

The basic principle of the electric furnace method for melting high carbon chromium is carbon reduction of chromium ore. The initial temperature for carbon reduction of chromium oxide is 1373K, and the reaction temperature for producing CR7C3 is 1403K. The reaction temperature for chromium reduction is 1523K, so the carbon carbide obtained in carbon reduction of chromium is not metallic chromium. The amount of carbon content containing chromium depends on the reaction temperature. It is easier to produce carbides with high carbon content than carbides with low carbon content.