BJ molten steel cleaning agent

Abstract

The invention discloses a BJ molten steel cleaning agent. The BJ molten steel cleaning agent comprises a steel belt coating layer and a core, wherein the core is a calcium metal wire with calcium content of higher than 99%, the steel belt coating layer is used for coating the core, a steel belt is of 08AL type, the core comprises the following metal components according to percentage content: higher than or equal to 99% of Ca, less than or equal to 0.8% of Al, less than or equal to 0.5% of Mg, less than or equal to 5% of Mn, less than or equal to 0.5% of Si and less than or equal to 0.5% of Fe, the wire diameter of the core is 7.5+ / -0.05mm, and the thickness of the steel belt coating layer is 0.6+ / -0.05mm. The BJ molten steel cleaning agent has the advantages of improving the degree of purity of molten steel, reducing and eliminating the blockage of continuously cast steel at a water gap, substantially increasing the yield, being capable of effectively reducing steelmaking cost and being energy-saving and environment-friendly. The BJ molten steel cleaning agent is used for replacing a common powder core-spun wire under the condition that the situation of steel industries is poor, so that the smelting cost is further reduced, and the yield of calcium is increased; and the BJ molten steel cleaning agent has a certain positive promotion effect, is also capable of reducing operation intensity and has wide market prospect.

Description

technical field [0001] The invention relates to the technical field of metallurgical auxiliary materials, in particular to a BJ molten steel purifier. Background technique [0002] The key to improving the performance and quality of steel is to improve the purity of steel, minimize the impurity content in steel and control the composition of impurities. Extra-furnace refining technology is an important link and means for iron and steel industries in various countries to improve steel quality. Among them, the wire feeding technology has been accepted by more and more manufacturers. However, there are many defects in domestic common powder calcium-based cored wires: 1. The proportion of iron powder (7.4 g / cm3) and calcium particles (1.54 g / cm3) in the common powder calcium-iron cored wire is too large and uneven 2. Because the inclusions in the ordinary calcium-iron cored wire cannot be precisely controlled, coupled with its own asymmetry, the yield of calcium cannot be...

AI Technical Summary

Problems solved by technology

However, there are many defects in domestic common powder calcium-based cored wires: 1. The proportion of iron powder (7.4 g / cm3) and calcium particles (1.54 g / cm3) in the common powder calcium-iron cored wire is too large and uneven 2. Because the inclusions in the ordinary calcium-iron cored wire cannot be precisely controlled, coupled with its own asymmetry, the yield of calcium cannot be accurate and stable; 3. The calcium-silicon alloy cored wire Calcium silicon alloys are unstable and contain inclusions and oxidized components, so the unstable yield of calcium still exists

The following problems exist in the above technical solutions: 1. Metal calcium wire is reduced calcium with low purity, which will bring impurities into molten steel, which is not conducive to the purity of molten steel; 2. The depth of molten steel entering molten steel after feeding the line is not enough, and gasification and volatilization Seriously, the alloy yield is low, and metallurgical materials cannot be fully utilized; 3. The alloy wire is easily oxidized before entering the molten steel, and a calcium oxide layer is formed on the outer surface of the calcium wire, which prevents the reflection of calcium in the molten steel; 4. After feeding the wire, the molten steel The reaction is severe, the floating rate of molten steel inclusions is slow, and the purification effect of molten steel is not good

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