Stainless steel slagging and degassing refining agent

Abstract

This invention relates to a rustless steel slag-forming and degassing agent, which is specifically a casting accessory material to clean up rustless steel molten steel surface and improve rustless steel quality, and belong to metal surface treatment technique area in foundry industry. This agent mainly comprises 70-80 wt% of dolomite, 10-15 wt% of aluminum dust and 6-15 wt% of fluor. The components are mixed completely in normal temperature and packed to completed product. This invention possesses the properties of increasing life of brasque to more than 200 times; improving slag-forming ability to decrease endermic points, decrease surface points and pocks of buffing surface and increase rate of finished products and improving thermal insulation and degasification by floating constantly on the surface of molten steel, in which molten steel is prevented to contact with air and oxygenized, suck in hydrogen and nitrogen and interfused with foreign substance, so as to ensure cleaner molten steel higher property.

Description

technical field [0001] The invention relates to a stainless steel slagging and degassing refining agent, in particular to a casting auxiliary material used for purifying molten stainless steel and improving the quality of stainless steel, belonging to the technical field of foundry metallurgy. Background technique [0002] Before the present invention was made, in the prior art, the following three schemes were usually adopted for the slagging and degassing refining agent for molten steel surface treatment in the stainless steel foundry industry: 1, adopt lime (CaO), fluorite (CaF ) to mix and 2. It is made by mixing lime (CaO), magnesium oxide (MgO) and fluorite (CaF2); 3. It is made by mixing lime (CaO), fluorite (CaF2) and aluminum powder (Al2O3). These slag-forming and degassing refining agents are mainly used in large steel mills, and less used in foundries. The main reasons are: 1. The use effect is not obvious, and the subcutaneous black spots of the workpiece, black...

AI Technical Summary

Problems solved by technology

The main reasons are: 1. The use effect is not obvious, and the subcutaneous black spots of the workpiece, black spots and pitting on the surface of the polished piece cannot be reduced, thereby greatly reducing the yield of the product; 2. The effect of heat preservation and degassing is not ideal, and the slag removal Trouble, there are still a lot of slag inclusions; 3. The furnace wall is severely eroded. Since the furnace lining is made of magnesia (MgO), the molten steel rolls in the furnace lining, which will wash the furnace lining, and a small amount of magnesia will fall into the molten steel, causing the furnace lining Under normal circumstances, a furnace lining can be used for 150-180 times, but after using slagging agent, it can only be used within 100 times