A kind of method for manufacturing high nitrogen steel with chromium concentrate powder

Abstract

The invention provides a method for preparing high-nitrogen steel from chromium concentrate powder. In the method, chromium concentrate is employed to replace carbon reduced chrome oxide as a main raw material for preparing intermediates of high-nitrogen steel and preparing high-nitrogen steel directly. The raw material source is wide and reliable, the operation of calcination of carbon-reduced chrome oxide by utilization of high-carbon ferrochrome is omitted, the production cost is lowered, the production efficiency is raised, smoke pollution is reduced, a low carbon content and a high and controllable nitrogen content can be ensured, melting of high-nitrogen steel with different component requirement can be controlled to ensure a low carbon content and a high and controllable nitrogen content, and high-quality high-nitrogen steel bases and castings can be obtained.

Description

technical field [0001] The invention relates to a method for smelting high-strength stainless steel, which belongs to the field of iron and steel smelting. Background technique [0002] High-nitrogen austenitic stainless steel (hereinafter referred to as high-nitrogen steel) has attracted the attention of the manufacturing industry and application fields for its excellent properties such as nickel saving, corrosion resistance, high strength, and high plasticity. It has gradually expanded its application range and can be used in wider application fields and It can be applied in more complex environmental conditions. [0003] High-nitrogen steel is mainly composed of chemical elements such as iron (Fe), chromium (Cr), manganese (Mn), nitrogen (N), and the nitrogen content is generally 0.6wt% to 1.0wt%. When smelting high-nitrogen steel at atmospheric pressure, nitrogen is difficult to add and easily escapes from the melt to form nitrogen gas, so it is generally smelted under ...

AI Technical Summary

Problems solved by technology

When smelting high-nitrogen steel at atmospheric pressure, nitrogen is difficult to add and easily escapes from the melt to form nitrogen gas, so it is generally smelted under high pressure, which limits the output

Some documents have proposed the method that can smelt high-nitrogen steel under normal pressure or near normal pressure, such as CN103451508A has proposed that the high-nitrogen alloy melt is flow-limited and blended into Fe-Cr-Mn melt, and CN103436768A has proposed that Fe-Cr- Mn melt is slowly blended into high-nitrogen alloy melt, CN103451509A proposes to add basic steel materials etc. in high-nitrogen alloy melt, and the main raw materials for adding Cr and N are all ferrochrome nitride and a small amount of high-nitrogen ferrochrome, and This kind of ferrochromium nitride and high nitrogen ferrochromium raw materials has a small output and high price, especially it cannot guarantee stable useful chemical composition requirements and impurity element restriction requirements, cannot meet the needs of mass production of high nitrogen steel, and cannot guarantee high High quality mass production of nitrogen steel

The use of carbon-reduced chromium oxide raw materials to prepare nitrogen-containing ferrochrome to directly manufacture high-nitrogen steel can have a stable source of raw materials and lower manufacturing costs and ensure product quality, but carbon-reduced chromium oxide is generally roasted with high-carbon ferrochrome To prepare, it needs energy consumption and there is smoke pollution and raw material loss