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Microalloy and preparation method thereof

A technology of microalloying and vanadium compounds, applied in the field of microalloying, can solve the problems of obtaining vanadium-titanium-nitrogen microalloys and the like, and achieve the effect of stable composition

Active Publication Date: 2015-05-13
胡力
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, microalloys such as vanadium nitrogen, vanadium iron, and titanium iron have been prepared by existing methods. There is no method to directly obtain vanadium titanium nitrogen microalloys, and there is no method that can be used to prepare vanadium nitrogen microalloys and For the preparation of vanadium-titanium-nitrogen microalloys

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0015] The invention provides a method for preparing a microalloy, wherein the method comprises pressing a mixed raw material containing a vanadium-containing compound, a carbonizing agent and a catalyst to obtain a microalloy blank, and then calcining the microalloy blank in a nitrogen atmosphere , the calcination includes sequentially performing 3-7h at 400-800°C, 4-7h at 800-1200°C, 7-15h at 1200-1600°C, and reducing the temperature of the calcined product to 100°C within 6-9h Below; the catalyst is one or more of ammonium salt, iron salt, iron powder and calcium compound.

[0016] According to the preparation method of the microalloy provided by the present invention, as long as the microalloy blank is sequentially calcined at 400-800°C for 3-7h in a nitrogen atmosphere, calcined at 800-1200°C for 4-7h, and calcined at 1200-1600°C for 7-15h, and If the temperature of the calcined product is lowered to below 100°C within 6-9 hours, a microalloy with a higher apparent densit...

Embodiment 1

[0036] Put -140 purpose V 2 o 5 1000kg, 310kg of graphite powder, 120kg of anatase titanium dioxide, 6kg of ferrous carbonate, mix evenly, then add 140kg of polyvinyl alcohol aqueous solution with a concentration of 8% by weight and wet mix for 60 minutes, and apply a pressure of 9MPa to the mixed raw materials after wet mixing. Finally, the microalloy billet is obtained, and the microalloy billet is dried at 180°C for 14 hours and then sent into a double-channel pusher kiln with a nitrogen pressure of 101650Pa. The double-channel pusher kiln is divided into three heating sections and one non-heating section. The section temperature is 400-800°C, 800-1200°C, 1200-1600°C in sequence, the microalloy blank is calcined at 400-800°C for 5 hours, at 800-1200°C for 5 hours, at 1200-1600°C for 12 hours, and In the non-heating section, it is cooled to 50°C within 9 hours and discharged from the kiln to obtain a vanadium-titanium-nitrogen microalloy. The main composition of the obtain...

Embodiment 2

[0039] Put -140 purpose V 2 o 3 1000kg, 260kg of graphite powder, 100kg of rutile titanium dioxide, 4kg of ammonium bicarbonate and mix evenly, then add 120kg of polyvinyl alcohol aqueous solution with a concentration of 8% by weight and wet mix for 60 minutes, and apply a pressure of 9MPa to the mixed raw materials after wet mixing. To obtain the microalloy billet, dry the microalloy billet at 180°C for 18 hours and then send it into a double-channel pusher kiln with a nitrogen pressure of 101725Pa. The double-channel pusher kiln is divided into three heating sections and one non-heating section. The heating section The temperature is 400-800°C, 800-1200°C, 1200-1600°C, the microalloy blank is calcined at 400-800°C for 5 hours, at 800-1200°C for 5 hours, at 1200-1600°C for 12 hours, and In the non-heating section, cool to 30°C within 9 hours and leave the kiln to obtain a vanadium-titanium-nitrogen microalloy. The main composition of the obtained vanadium-titanium-nitrogen ...

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PUM

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Abstract

The invention discloses a preparation method for microalloy. The method comprises the steps of: performing compression moulding on mixed raw materials containing vanadium compound, carburizing agent and catalyst to obtain microalloy blank, then calcining the microalloy blank in a nitrogen atmosphere, wherein the calcining is performed for 3-7h at 400-800 DEG C, for 4-7h at 800-1200 DEG C, and for 7-15h at 1200-1600 DEG C in sequence, and the temperature of the product obtained by calcining is reduced to 100 DEG C below within 6-9h, and the catalyst is one or more of ammonium salt, ferric salt, ferrous powder and calcium compound. The invention further discloses a microalloy prepared by using the method. The invention further discloses a microalloy. The preparation method for the microalloy not only can be used for preparing vanadium-nitrogen microalloy, but also can be used for preparing vanadium-titanium-nitrogen microalloy, and the prepared microalloy has larger apparent density, and the microalloys in different batches are stable in ingredients.

Description

technical field [0001] The invention relates to a method for preparing a microalloy, a microalloy prepared by the method and a microalloy. Background technique [0002] Microalloyed steel is to add trace elements such as vanadium and titanium to the steel, so that its performance is significantly improved compared with ordinary carbon steel. While meeting the higher performance requirements for steel, the use of microalloyed steel can also greatly save the amount of steel used, reduce environmental pollution, and improve the safety of structures. [0003] CN1483843A discloses a kind of method of producing high ferrotitanium, is to be raw material with rutile, aluminum grain, lime and potassium chlorate, adopts the method for producing high ferrotitanium by the method outside the furnace, wherein: (1) the added rutile contains TiO 2 ≥87%; C<0.10%, S<0.03%, P<0.04%, the amount of particle size is 0.1-0.5mm>85%; the aluminum content of aluminum powder>98%, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C35/00
Inventor 胡力
Owner 胡力