Brief modification treatment of inclusions in molten steel treated with magnesium-cored wire
Update time:2022-06-16 Focus on:229
Obtaining products with higher purity and higher uniformity is the current hot spot of iron and steel production and research, as well as the development direction of metallurgical technology. As far as the current production technical conditions are concerned, the control of impurity element content in steel has reached a high level (total amount of impurities in steel: S+P+N+H+T•O≤100×10-6), and with the increase in molten steel The further reduction of the impurity element content, the more obvious the adverse effect of the inclusions in the steel on the iron and steel products. Therefore, it is particularly important to control and improve the properties of the inclusions in the steel according to the different quality requirements of the products.
The feeding process of magnesium-core cored wire has been developed and successfully applied in the production of ductile iron. At the same time, great progress has been made in the research on the modification treatment of molten steel inclusions. The outer layer is 0.3 mm thick ordinary steel strip, the core is magnesium or magnesium alloy core wire, and the powder layer with heat insulation function is in between. The magnesium core-wrapped wire with the above structure can adjust its thermal conductivity by adjusting the thickness and physical properties of the powder layer, so as to adjust the temperature of the magnesium-cored wire during the wire feeding process to prevent it from melting and vaporizing in advance, so as to achieve the feeding of magnesium into The purpose of the predetermined depth of molten steel, so that the magnesium treatment process can be stabilized and a higher absorption rate can be obtained, so that the current problems can be better solved.
The denaturation of inclusions was studied by using magnesium-fed cored wire, and the experimental research was carried out on a 500kg intermediate frequency induction furnace and achieved good results. Not only the treatment process is much smoother than that of magnesium-containing alloy cored wire with ordinary structure, but the magnesium content in the steel is stable. Above 0.003%, the denaturation effect of inclusions in steel is obvious.