Method for remelting high-strength stainless steel

Abstract

The invention relates to a method for remelting high-strength stainless steel. The method is characterized by including the steps that Fe-Mn-Cr nitrogen absorption alloy melt containing manganese and chromium is first smelted, then, high-nitrogen steel waste material is added to the nitrogen absorption alloy melt step by step at low melt temperature, nitrogen-containing alloy is added in proportion according to the designed composition proportion of high-nitrogen steel, and after being completely melted and homogenized, the nitrogen-containing alloy is discharged for pouring. The method solves the problem that the nitrogen content is insufficient in the recovering and remelting processes of the high-nitrogen steel waste material and can control the nitrogen content of new high-nitrogen steel smelted by the high-nitrogen steel waste material to be close to or not lower than that of the original high-nitrogen steel waste material.

Description

technical field

[0001] The invention relates to a method for remelting high-strength stainless steel, which is a method for smelting high-nitrogen stainless steel by atmospheric pressure remelting, 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. As a new type of steel with high strength, toughness and corrosion resistance, it can be obtained in wider and more complex fields. widely used.

[0003] High-nitrogen steel (N≥0.6wt%) is difficult to add nitrogen during smelting and easily escapes from the melt to form nitrogen gas, so it is generally smelted under high pressure. Similarly, remelting high-nitrogen steel back into the melt requires Remelting under high pressure is used, otherwise a large amount of nitrogen in the melt will...