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Boron-containing alloy smelting process with high yield

A smelting method and yield technology, applied in the field of boron-containing alloy smelting and boron-containing alloy smelting, can solve the problems of low boron yield and achieve the effects of improving hardenability, hardness, and hardenability

Inactive Publication Date: 2010-06-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low boron yield in the existing boron-containing alloy smelting process, and to provide a new process for smelting boron-containing alloys under atmospheric conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A 500 kg intermediate frequency induction furnace is used to smelt boron-containing high-speed steel materials with a boron content exceeding 0.5%. The specific process steps are as follows:

[0018] (1) Add raw materials such as steel scrap, ferrochrome, ferromolybdenum, ferrotungsten, pig iron, and ferrovanadium into the electric furnace, and then smelt with electricity. When the temperature of the alloy is higher than the liquidus temperature of 183°C, add 0.2% silicon Calcium alloy pre-deoxidation (mass percentage of calcium-silicon alloy: 29.37% Ca, 0.30% C, 1.16% Fe, 0.73% Al, balance Si), then add 0.18% aluminum for final deoxidation, and then add 0.3% ferrotitanium (Mass percentage of ferro-titanium is: 30.69% Ti, 0.72% Al, 1.18% Si, 0.63% Mn, 0.06% C, 0.11% Cu, balance Fe.) Nitrogen in molten metal is fixed.

[0019] (2) Preheat ferboron (mass percentage of ferroboron: 22.07% B, 0.04% C, 1.08% Si, 1.25% Al, 0.03% Cu, balance Fe.) to 350°C, add For the ferro-ti...

Embodiment 2

[0022] A 750 kg intermediate frequency induction furnace is used to smelt boron-containing wear-resistant cast steel alloys with a boron content exceeding 0.5%. The specific process steps are as follows:

[0023] (1) Add raw materials such as steel scrap, pig iron, ferrochrome, ferrosilicon and ferromanganese into the electric furnace, and then smelt with electricity. When the temperature of the alloy is 229°C above the liquidus temperature, add 0.5% silicon calcium alloy to Deoxidation (mass percentage of silicon-calcium alloy is: 29.37% Ca, 0.30% C, 1.16% Fe, 0.73% Al, balance Si), then add 0.12% aluminum for final deoxidation, then add 0.2% ferrotitanium (ferro-titanium The mass percentages are: 30.69% Ti, 0.72% Al, 1.18% Si, 0.63% Mn, 0.06% C, 0.11% Cu, and the balance Fe.) to fix nitrogen in molten metal.

[0024](2) Preheat ferboron (mass percentage of ferroboron: 22.07% B, 0.04% C, 1.08% Si, 1.25% Al, 0.03% Cu, balance Fe.) to 250°C, add The ferro-titanium, which accou...

Embodiment 3

[0027] A 500 kg intermediate frequency induction furnace is used to smelt boron-containing cast steel materials with a boron content of less than 0.5%. The specific process steps are as follows:

[0028] (1) Add raw materials such as steel scrap, ferrochromium, ferromolybdenum, pig iron, nickel plate, ferrosilicon and ferromanganese into the electric furnace, and then smelt with electricity. When the temperature of the alloy is 217°C above the liquidus temperature, add 0.4 % silicon-calcium alloy pre-deoxidation (mass percentage of silicon-calcium alloy: 29.37% Ca, 0.30% C, 1.16% Fe, 0.73% Al, balance Si), then add 0.15% aluminum for final deoxidation, then add 0.2% Ferro-titanium (mass percentage of ferro-titanium: 30.69% Ti, 0.72% Al, 1.18% Si, 0.63% Mn, 0.06% C, 0.11% Cu, balance Fe.) fixes nitrogen in molten metal.

[0029] (2) Preheat ferboron (mass percentage of ferroboron: 22.07% B, 0.04% C, 1.08% Si, 1.25% Al, 0.03% Cu, balance Fe.) to 300°C, add For the ferro-titaniu...

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Abstract

The invention discloses a boron-containing alloy smelting process with high yield. The process is characterized in that firstly boron-containing alloy is smelted in an electric furnace, when the temperature of the alloy is 180-230 DEG C higher than liquidus temperature, 0.2-0.5 % of calcium-silicon is added for preliminary deoxygenation, then 0.12-0.18% of aluminium is added for final deoxygenation, and then 0.2-0.3% of ferrotitanium is added for fixing nitrogen in metal solution, and finally ferrotitanium and ferroboron tightly wrapped by an aluminium plate are added into metal liquid together, when the temperature of boron-containing alloy is 200-260 DEG C higher than the liquidus temperature, boron-containing alloy liquid is discharged and can be used for pouring of cast or cast ingot. The invention is adopted to smelt boron-containing alloy, yield of boron element is over 90%, consumption of boron element can be obviously reduced, and boron-containing alloy production cost can be reduced, thus the invention has better economic and social benefits.

Description

technical field [0001] The invention relates to a method for smelting a boron-containing alloy, in particular to a method for smelting a boron-containing alloy with a high boron yield, and belongs to the technical field of metal smelting. technical background [0002] When boron is added to iron and steel materials, part of boron is dissolved in the matrix, which can improve the hardenability and hardenability of the matrix, and part of boron and iron combine to form high-hardness iron-boron compounds. Therefore, adding boron to iron and steel materials can greatly improve the hardness of iron and steel materials. hardness and improved wear resistance. However, boron is a very active element, and when added to iron and steel materials, the burning loss is large and the yield is low, resulting in a huge waste of resources. In order to increase the yield of boron in the smelting process of boron-containing alloys, Chinese invention patent CN1600884 discloses a method for dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/06C21C7/00
CPCY02P10/20
Inventor 符寒光邢建东雷永平侯建强
Owner BEIJING UNIV OF TECH
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