A method for preparing high-strength stainless steel from high-alloy melt

Abstract

The invention relates to a method for the preparation of high-strength stainless steel by using high alloy melt. The method is characterized by comprising the following steps: firstly, preparing high nitrogen alloy melt and Fe-Cr-Mn melt respectively; then adding the Fe-Cr-Mn melt slowly into the high nitrogen alloy melt; discharging for pouring after temperature controlling and uniform stirring. According to the method, smooth and steady fusing of the high nitrogen alloy melt and the Fe-Cr-Mn melt is facilitated, the escape of nitrogen is obviously reduced, high nitrogen steel melt with higher nitrogen content and better stability can be obtained so as to obtain high nitrogen billet steel with less bubble and high nitrogen content, and the detection for the nitrogen content of the high nitrogen billet steel can be up to 1.0 wt%.

Description

technical field [0001] The invention relates to a method for preparing high-strength stainless steel with high-alloy melt, which is a method for smelting high-nitrogen stainless steel under normal pressure, and belongs to the field of iron and steel smelting. Background technique [0002] High-nitrogen stainless steel (hereinafter referred to as high-nitrogen steel) has attracted attention for its excellent properties such as nickel saving, corrosion resistance, high strength, and high plasticity. widely used. [0003] The main chemical elements of high nitrogen steel are iron (Fe), chromium (Cr), manganese (Mn), nitrogen (N) and a small amount of molybdenum (Mo), copper (Cu), silicon (Si), niobium (Nb), vanadium (V), titanium (Ti), etc., wherein the content of nitrogen element should be ≥ 0.6wt%. In the smelting of high nitrogen steel, it is difficult to add nitrogen and easily escape from the melt to form nitrogen, so it is generally smelted under high pressure, which li...

AI Technical Summary

Problems solved by technology

When smelting high-nitrogen steel, 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

The 200810050792.8 patent application proposed the method of adding high-nitrogen ferrochrome to Fe-Mn melt to smelt high-nitrogen steel under normal pressure, and the 201210458675.1 patent application also proposed the method of adding manganese nitride to Fe-Cr melt to smelt high-nitrogen steel under normal pressure. method, making it possible to produce high nitrogen steel under normal pressure

However, experiments have shown that simply mixing low-carbon molten steel into nitrogen-containing alloy liquid will still cause a large amount of nitrogen to escape, making it difficult to obtain high-nitrogen steel with high nitrogen content.