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A kind of high-purity ferrochrome alloy and preparation method thereof

A ferrochromium alloy and high-purity technology, which is applied in the field of high-purity ferrochromium alloy with high chromium content and its preparation field, can solve the problems of cracks, high oxide inclusion content, low specific gravity of vacuum ferrochromium, etc., and achieves high purity and oxide impurities. The effect of low content and low carbon content

Active Publication Date: 2011-11-30
荥经华盛冶金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calculated by weight percentage, in micro-carbon ferrochromium, the content of Cr is about 60.0%, and the content of C is not more than 0.06%. The content of harmful elements S, P, Si and harmful gas elements H, O, N in iron is relatively high; the Cr content in vacuum ferrochrome can reach 67.0%, which is higher than that of micro-carbon ferrochrome Cr, and some harmful elements The content is also lower than that in micro-carbon ferrochromium, but the specific gravity of vacuum ferrochromium is small, and the content of oxide inclusions is high. When used as an additive for some special steel and high-temperature corrosion-resistant alloy steel, when the steel ingot crystallizes, the inclusions exist in the steel ingot In the middle, it causes structural defects such as cracks during steel rolling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A preparation method of high-purity ferrochromium alloy, comprising the steps of:

[0015] Step 1: Grind high-carbon ferrochrome and chromium oxide green into 400-mesh fine powder respectively with a ray mill, mix and stir high-carbon ferrochrome powder and chromium oxide green powder evenly, control the oxygen-carbon atomic ratio in the mixture to be 1.3, and then Add the polyvinyl alcohol adhesive that accounts for 5% of the mixture weight, continue to stir and mix, use a press to compress the mixture into blocks, then put the pressed block mixture into the drying room, and control the drying room The temperature is 300°C, and the moisture is tested by sampling. After the moisture content in the block mixture is less than 0.5%, the block mixture is transferred to a vacuum resistance furnace, and the temperature is raised by power transmission. The temperature in the vacuum furnace is kept at 1450°C and the vacuum degree is 400Pa. Vacuum decarburization, judge the carb...

Embodiment 2

[0021] A preparation method of high-purity ferrochromium alloy, comprising the steps of:

[0022] Step 1: Grind high-carbon ferrochrome and chromium oxide green into 400-mesh fine powder respectively with a ray mill, mix and stir high-carbon ferrochrome powder and chromium oxide green powder evenly, control the oxygen-carbon atomic ratio in the mixture to be 1.5, and then Add the polyvinyl alcohol adhesive that accounts for 5% of the mixture weight, continue to stir and mix, use a press to compress the mixture into blocks, then put the pressed block mixture into the drying room, and control the drying room The temperature is 310°C, and the moisture is tested by sampling. After the moisture content in the block mixture is less than 0.5%, the block mixture is transferred to a vacuum resistance furnace, and the temperature is raised by power transmission. The temperature in the vacuum furnace is kept at 1500°C and the vacuum degree is 800Pa. Vacuum decarburization, judge the carb...

Embodiment 3

[0028] The present invention also provides a preparation method for the above-mentioned high-purity ferrochrome alloy, comprising the steps of:

[0029] Step 1: Grind the high-carbon ferrochrome and chromium oxide green into 400-mesh fine powder respectively with a ray mill, mix and stir the high-carbon ferrochrome powder and chromium oxide green powder evenly, and control the oxygen-carbon atomic ratio in the mixture to be 1.2, and then Add the polyvinyl alcohol adhesive that accounts for 5% of the mixture weight, continue to stir and mix, use a press to compress the mixture into blocks, then put the pressed block mixture into the drying room, and control the drying room The temperature is 290°C, and the moisture is tested by sampling. After the moisture content in the block mixture is less than 0.5%, the block mixture is transferred to a vacuum resistance furnace, and the temperature is raised by power transmission. The temperature in the vacuum furnace is kept at 1400°C and ...

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Abstract

The invention discloses a high-purity ferrochrome alloy which is composed of the following components in weight ratio: Cr is 85.0-100%, C is 0-0.01%, Si is 0-0.5%, S is 0-0.02%, and P is 0-0.02%. 0.01%, H is 0-0.01%, O is 0-0.1%, N is 0-0.01%, Fe is 0-14.0%, and other oxide impurities are 0-0.34%. The present invention also provides a method for preparing the above-mentioned high-purity ferrochromium alloy. The high-purity ferrochromium alloy provided by the invention has higher purity than ordinary ferrochromium alloy, and has low carbon content, larger specific gravity than ordinary ferrochromium, and low oxide impurity content, and can be used to replace expensive metal chromium under certain conditions, but the cost is reduced 50%; and the preparation method of the high-purity ferrochromium alloy provided at the same time can provide a reference for the preparation of the high-purity ferrochromium alloy.

Description

technical field [0001] The invention relates to a ferrochromium alloy and its preparation method, in particular to a high-purity ferrochrome alloy with high chromium content and a preparation method thereof. Background technique [0002] At present, there are mainly two kinds of ferrochrome alloys with high purity, which are ferrochrome alloys called "micro-carbon ferrochrome" and "vacuum ferrochrome". Vacuum ferrochrome is ferrochrome made by solid-state decarburization in a vacuum resistance furnace. Calculated by weight percentage, in micro-carbon ferrochromium, the content of Cr is about 60.0%, and the content of C is not more than 0.06%. The content of harmful elements S, P, Si and harmful gas elements H, O, N in iron is relatively high; the Cr content in vacuum ferrochrome can reach 67.0%, which is higher than that of micro-carbon ferrochrome Cr, and some harmful elements The content is also lower than that in micro-carbon ferrochromium, but the specific gravity of v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/06C22C1/02C21C7/10C21C7/068C21C7/064C21C7/00
Inventor 郭稳胜何卫星
Owner 荥经华盛冶金科技有限公司