High-carbon silicon alloy is an alloy composed of silicon and carbon, also known as high-carbon silicon, that is, ferrosilicon with a large carbon content.
High carbon silicon alloy is a new type of alloy for converter. It can completely replace the recarburizer and deoxidizer ferrosilicon, and it can be added at the bottom of the ladle or along with the steel flow. Due to the high specificity of high-carbon silicon alloy, it can play a role in deoxidation, so that the recovery rate of carbon is greatly improved (the recovery rate of carbon can reach more than 98%).
High-carbon silicon alloy can improve the quality of molten steel, improve product quality, improve product performance, reduce alloy addition, reduce steelmaking costs, increase economic benefits, greatly improve environmental conditions, and reduce labor intensity of workers.
The high-carbon silicon alloy includes the following components, which are prepared by smelting according to the weight ratio: silicon 50-68%, carbon 15-20%, phosphorus ≤ 0.05%, sulfur ≤ 0.05%.
A method for preparing a high-carbon silicon alloy, that is, the process steps are steel preparation-smelting-slagging-removing-ingot-casting-testing-composition adjustment-remelting-aluminum ingot input-stirring-slagging-inoculation-pour into blocks.
When the composition of the prepared steel is relatively certain, the remelting process may not be required, and its preparation method is steel selection-smelting-putting in aluminum ingots-stirring-removing slag-inoculation-casting.
The steel used in the production method of the high-carbon silicon alloy can be scrap steel, and an appropriate amount of ferrosilicon is added. Scrap steel should be trusted by shot blasting before smelting.
The positive effects of high-carbon silicon alloy are 1. Since the content of silicon in high-carbon silicon alloy is more than 50%, it has a strong deoxidation effect, and the deoxidizer does not contain manganese and other elements, so it has wide applicability; 2. High-carbon silicon alloy The specific gravity is large, and it is easy to enter the molten steel and combine with oxygen when it is put into the molten steel so that the molten steel can be fully deoxidized, and the utilization rate is high. The deoxidation rate is high. 3. Compared with pure aluminum, the production cost is greatly reduced, and the use of scrap steel can further reduce the cost; 4. With high carbon content, the deoxidizer has strong fluidity during casting and good filling performance; 5. Remelting can be used in the preparation process The process adjusts the composition of high-carbon silicon alloy to ensure the reliable determination of its chemical composition and avoid the mixing of harmful elements and other inclusions. 6. Inoculate with an inoculant before it comes out of the oven, so that it is not easy to pulverize. Example 1 The equipment is a 160KW thyristor intermediate frequency induction furnace with a melting capacity of 150kg.
Preparation process A. Mix 88kg of steel scrap and 1kg of 75SiFe. Scrap steel has been shot blasted to remove rust. b. Put the steel scrap into the furnace to melt to >1570℃, and then put it in ferrosilicon. , d, detect the steel ingot, adjust its composition to C 0.40%, Si 1.20%, P 0.05%, S 0.04%, Fe balance, e, put the steel ingot into the furnace for remelting, and adjust the material f by adding and removing materials, when the molten steel rises to >1600°C, add 71kg of semi-coke after slagging and deslagging, g, degas, deoxidize, incubate after stirring, and pour quickly, the pouring temperature is 1250-1280°C. A high-carbon silicon alloy deoxidizer was obtained through furnace tests.