Production method of vanadium-titanium iron powder

Abstract

The invention provides a production method of vanadium-titanium iron powder. The production method includes the following steps that (1), waste steel is smelted in a medium frequency furnace, then steel is tempered with a vanadium-titanium alloy, and thus smelted vanadium-titanium molten steel is prepared from the chemical compositions of 0.1-0.5% of V, 0.06-0.6% of Ti, 0.4% of C, 0.40% or the less of Si, 0.4% or the less of Mn, 0.005% or the less of P and 0.005% or the less of S; (2) the smelted vanadium-titanium molten steel in the step (1) is injected into an atomized feeding tank, and thecompositions are constantly adjusted to be controlled as 0.1-0.5% of V, 0.06-0.6% of Ti, 0.15-0.4% of C, 0.4% or the less of Si, 0.4% or the less of Mn, 0.005% or the less of P and 0.001% or the lessof S, and the temperature is 1650-1680 DEG C; (3), the vanadium-titanium molten steel in the step (2) enters an atomizer for atomization; and (4), after atomization and hopper, the vanadium-titanium molten steel is sent to a magnetic separation drying line for magnetic separation, drying, annealing, screening and packaging to obtain atomized vanadium-titanium iron powder. According to the production method of the vanadium-titanium iron powder, production of the vanadium-titanium atomized iron powder with various performance standards can be achieved, the production process is simple, the quality of the obtained base powder is improved compared with the prior art, and a good raw material for downstream production is provided.

Description

technical field [0001] The invention relates to a water atomization process in the field of powder metallurgy, in particular to a production method of vanadium-titanium iron powder. Background technique [0002] Vanadium-titanium-iron powder is used to produce parts, and has the advantages of corrosion resistance and high strength. At present, it is mainly prepared by smelting vanadium-titanium magnetite, such as a low-grade vanadium-titanium magnetite powder of CN106987672A to produce natural micro-alloyed reduced iron powder The method is to transfer vanadium-titanium-magnetite powder, sodium sulfate, fluorite and semi-coke into a mixer and mix them evenly to obtain reducing materials, which are put into a refractory tank together with a reducing agent, and then put into a tunnel kiln for reduction after filling the tank. The reduced vanadium-titanium-magnetite powder is ground, and after magnetic separation, enters the shaking table for re-election, and the iron concentra...

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Problems solved by technology

The method adopts vanadium-titanium magnetite to produce micro-alloyed reduced iron powder through smelting methods, and has the following problems: 1. The production process is complicated, and the concentrated ore-rich vanadium-titanium material must be produced first; 2. The composition and proportion of the obtained iron powder are unique. , the production of parts that cannot meet different performance requirements; atomized iron powder is produced by atomizing molten iron or steel with high-pressure water, because no impurities are mixed in the production process, it is relatively pure, and the iron powder and mist produced by the atomization method Chemical steel powder, with high bulk density and excellent compression performance, is the best raw material for pressing mechanical parts. Therefore, water atomization technology is a common technology in industrial production in the field of powder metallurgy. The method is to melt molten steel or molten steel at high temperature, adjust The content of each component of molten steel, the steel flow from the furnace is passed through a special nozzle with high-pressure atomized water, strong impact, external cooling, high-temperature molten steel or steel flow is beaten into extremely fine powder, and then passed through magnetic separation, drying, annealing, screening, Packaging, complete industrial production to produce iron powder or steel powder

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