Method for preparing composite deoxidant silicon aluminium barium calcium manganese iron ally used for steel making

Abstract

The invention relates to a composite deoxidizer for steelmaking-silicon-aluminum-barium-calcium-manganese-ferroalloy and a preparation method thereof, belonging to the technical field of steelmaking. The chemical composition (% by weight) of the composite deoxidizer for steelmaking is: 10-35% of Si, 5-15% of Al, 4-14% of Ba, 4-14% of Ca, 2-10% of Mn, and the balance For Fe and unavoidable impurities. The preparation method is as follows: use an intermediate frequency furnace or a power frequency furnace, take a certain proportion of scrap steel and 3 / 2 aluminum ingots and put them into the bottom of the furnace, then add silicon-barium alloy, silicon-calcium alloy, medium-carbon ferromanganese, and ferrosilicon alloy. Add the rest of the aluminum ingots after all the melting, fully stir and melt, and then get out of the furnace to obtain the composite deoxidizer for steelmaking with the required chemical composition—silicon-aluminum-barium-calcium-manganese-ferroalloy. The deoxidizer has specific gravity (3.5~4.5g / cm 3 ), low melting point (1050-1200°C), fine and hard crystallization, especially when using this composite deoxidizer when smelting low-alloy structural steel and carbon steel, it can effectively improve the comprehensive performance of steel.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a composite deoxidizer for steelmaking-silicon-aluminum-barium-calcium-manganese-ferroalloy and a preparation method thereof. Background technique [0002] The process of steelmaking is the process of decarburizing molten iron and removing harmful impurities such as phosphorus and sulfur by blowing oxygen or adding oxidants. The progress of this process, although the pig iron is smelted into steel, the [O] content in the steel increases. Especially like IF steel, in order to make the carbon content reach 0.02-0.03%, the oxygen in the steel will increase to 0.08-0.1%. [O] generally exists in the form of [FeO] and its oxides in molten steel. If it cannot be purified in time before casting the slab, it will affect the fatigue characteristics, processing performance, ductility, toughness, welding performance and HIC resistance of steel. , corrosion resistance, etc. ...

AI Technical Summary

Problems solved by technology

Some aluminum content is still very high (30-40%), and some grain refinement is not ideal

Some are easy to pulverize, have poor desulfurization and dephosphorization effects, and most deoxidizer manufacturers use submerged arc furnaces for production, because the one-time production cost of submerged arc furnaces is low, but the composition of the alloy is difficult to control accurately, often Can't achieve the expected effect