A method for preparing high nitrogen steel with micro-carbon ferrochrome

Abstract

The invention provides a method for preparing high-nitrogen steel from micro-carbon ferrochrome. First, micro-carbon ferrochrome powder is subjected to nitrogen addition, high-nitrogen ferrochrome intermediates are prepared, and then the high-nitrogen ferrochrome intermediates are employed to prepare high-nitrogen steel. In the method, micro-carbon ferrochrome powder is employed to prepare high-nitrogen ferrochrome intermediates self, the quality is good, the material quality is controllable, which is helpful for smooth and steady smelting of high-nitrogen alloy and high-nitrogen steel melt, chemical components of high-nitrogen steel can be controlled effectively, and high-quality high-nitrogen steel bases and castings can be obtained. Micro-carbon ferrochrome powder is employed as a main raw material for preparing high-nitrogen steel, the source is wide, the quality is reliable, the preparation cost of high-nitrogen steel bases and castings can be lowered when the method is compared with a method employing nitride ferrochrome and high-nitrogen ferrochrome raw materials directly.

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 gradually expanded its application range and has been applied in wider and more complex conditions due to its excellent properties such as nickel saving, corrosion resistance, high strength, and high plasticity. High-nitrogen steel is mainly composed of iron (Fe), chromium (Cr), manganese (Mn), nitrogen (N) and other chemical elements. The difficulty in smelting high-nitrogen steel is that nitrogen is difficult to add and easily escapes from the melt to form Nitrogen, some documents have proposed the method that can smelt high-nitrogen steel under normal pressure or near normal pressure, make such as CN103451508A have proposed that high-nitrogen alloy melt flow limit is mixed into Fe-Cr-Mn melt, and ...