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Modifier for grain and structure refinement of cast steel

A technology of modifying agents and grains, which is applied in the field of cast steel smelting, can solve the problems of unsatisfactory refinement effect, small particles of modifying agents, complicated preparation process, etc., and achieve refined morphology, good strength and toughness coordination, and uniform dispersion Effect

Active Publication Date: 2018-03-16
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a modifier for refining grain and structure of cast steel. And then mixed with the set ratio of rare earth ferrosilicon particles to prepare the fine-grain modifier, which overcomes the lack of fine grain and unsatisfactory refinement effect of the modifier particles used in the refinement of cast steel grains and structures in the prior art , complex preparation process and high production cost

Method used

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  • Modifier for grain and structure refinement of cast steel
  • Modifier for grain and structure refinement of cast steel
  • Modifier for grain and structure refinement of cast steel

Examples

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Effect test

Embodiment 1

[0030] The modifying agent used in the refining treatment of cast steel grains and structures in this embodiment is a powder obtained by atomizing ferro-titanium, ferro-vanadium, and ferro-niobium according to the set ratio and then mixed with the set ratio. The fine-grain modifier prepared by mixing rare earth ferrosilicon particles has the following elements by weight: 8% Ti, 8% V, 10% Nb, 15% Si, 8% RE and the rest are Fe elements. Modifiers are prepared by the following methods:

[0031] In the first step, the raw materials of titanium-iron alloy, vanadium-iron alloy and niobium-iron alloy are weighed according to the weight percentage of the elements set above, and these raw materials are prepared into titanium-iron powder, vanadium-iron powder and niobium-iron powder by atomization method, and the process operation The above-mentioned raw materials are heated in an electric furnace to 150-250°C higher than the melting point to melt all the iron alloys, and the molten met...

Embodiment 2

[0037]The modifier used for refining grain and structure of cast steel is a kind of powder obtained by atomizing ferro-titanium, ferro-vanadium and ferro-niobium according to the set ratio and then mixed with the set ratio of rare earth ferrosilicon The fine-grain modifier obtained by mixing the particles has a weight percent composition of elements: 15% Ti, 15% V, 18% Nb, 22% Si, 14% RE and the rest are Fe elements. The modifier is used as follows Method made:

[0038] In the first step, the raw materials of titanium-iron alloy, vanadium-iron alloy and niobium-iron alloy are weighed according to the weight percentage of the elements set above, and these raw materials are prepared into titanium-iron powder, vanadium-iron powder and niobium-iron powder by atomization method, and the process operation The above-mentioned raw materials are heated in an electric furnace to 150-250°C higher than the melting point to melt all the iron alloys, and the molten metal flows out from the ...

Embodiment 3

[0045] The modifier used for refining grain and structure of cast steel is a kind of powder obtained by atomizing ferro-titanium, ferro-vanadium and ferro-niobium according to the set ratio and then mixed with the set ratio of rare earth ferrosilicon The fine-grain modifier obtained by mixing the particles has a composition in percentage by weight of elements: 10% Ti, 10% V, 12.8% Nb, 17% Si, 10% RE and the rest are Fe elements. The modifier is used as follows Method made:

[0046] In the first step, the raw materials of titanium-iron alloy, vanadium-iron alloy and niobium-iron alloy are weighed according to the weight percentage of the elements set above, and these raw materials are prepared into titanium-iron powder, vanadium-iron powder and niobium-iron powder by atomization method, and the process operation The above-mentioned raw materials are heated in an electric furnace to 150-250°C higher than the melting point to melt all the iron alloys, and the molten metal flows o...

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Abstract

The invention discloses a modifier applied to refining treatment of grains and structures of cast steel and relates to smelting of cast steel. The modifier is a fine grain modifier prepared by mixing ferrotitanium powder, ferrovanadium powder and ferroniobium powder obtained by an atomization method according to a set ratio, and mixing the mixed powder with rare earth ferrosilicon particles according a set ratio. The modifier comprises the following elements in percentage by weight: 8-15% of Ti, 8-15% of V, 10-18% of Nb, 15-22% of Si, 8-14% of RE and the balance of Fe. Through the modifier, the defects that particles of the modifier applied to refining treatment of grains and structures of cast steel are not fine enough, the refining effect is not ideal, the preparation process is complex and the preparation cost is high in the prior art are overcome.

Description

technical field [0001] The technical scheme of the invention relates to the smelting of cast steel, in particular to a modifier used for refining grain and structure of cast steel. Background technique [0002] In the as-cast structure of general cast steel, the grains of the matrix structure are relatively coarse, and grain boundary segregation often occurs, and some large or reticular carbides are distributed along the grain boundaries, resulting in a decrease in the strength and toughness of the steel, and it is easy to Cracking or peeling occurs. Refining the as-cast structure of steel, improving the morphology and distribution of carbides, and reducing grain boundary segregation are effective methods to improve the performance of steel. Therefore, refining the grain and structure of steel is the most effective way to improve its performance. [0003] The methods to refine the grain and structure include changing the smelting process, adding inoculants, ultrasonic vibr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/20C22C30/00C22C38/14C22C38/12C22C38/02
CPCB22D27/20C22C30/00C22C38/005C22C38/02C22C38/12C22C38/14
Inventor 刘海明刘金海赵雪勃张建军付彬国董天顺李国禄
Owner HEBEI UNIV OF TECH