As an alloy additive, ferrochrome nitride is mainly used in the production of nitrogen-containing stainless steel. Its main components include nitrides such as CrN, Cr2N, Fe4N, and may also contain ferrochrome complex nitrides (Cr,Fe)2N(1-x). The addition method and effect of ferrochrome nitride mainly depend on the nitriding medium and nitriding temperature.
During the smelting process, ferrochrome nitride is widely used in electric furnaces and oxygen converters to smelt nitrogen-containing steel. Nitrogen, as an austenite-forming element, can replace the scarce nickel and reduce production costs. The addition of ferrochrome nitride can be achieved by changing the nitrogen partial pressure, temperature, and adding ferrochrome nitride alloy to smelt high-nitrogen nickel-free stainless steel. Among them, the nitrogen-increasing effect of increasing the nitrogen partial pressure is more obvious than that of changing the temperature.
In the specific smelting operation, ferrochrome nitride is added after the vacuum reduction of the LF+VOD refining operation is completed to carry out nitrogen addition. At the same time, the original nitrogen content in the molten steel is taken into account, and the chemical composition is fine-tuned, and finally final deoxidation and pouring are carried out.
