Steel making nitriding silicon-manganese alloy and preparation method thereof

A technology of silicon-manganese nitride alloy and silicon-manganese nitride, which is applied in the field of alloys, can solve problems such as low utilization rate, low alloy density, and high density, and achieve stable product quality, reduce steelmaking costs, and increase utilization rate. Effect

Inactive Publication Date: 2010-01-06
郸城财鑫特种金属有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that existing nitriding alloys for steelmaking have low nitrogen content and little application value or low utilization rate due to low alloy density, and provide a high nitrogen content, high density, Silicon nitride manganese alloy with low melting point
Contents of the invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) With silicon content as 18%, manganese content as 68% silicon manganese alloy, silicon content as 75% ferrosilicon alloy as raw material, weigh 760kg of silicon manganese alloy, 240kg of silicon ferrosilicon alloy, pass through 60 orders after crushing Sieve, after mixing evenly, add polyvinyl alcohol aqueous solution that accounts for 7% (70kg) mass concentration of material weight 7% and be that 8% polyvinyl alcohol aqueous solution is carried out wet mixing as binding agent, makes the spherical thing that particle diameter is 10mm;

[0019] (2) Put the sphere obtained in step (1) into a crucible and send it into a pusher kiln, feed high-purity nitrogen, and keep a positive pressure of 10Pa in the kiln, and react and sinter at 1000°C for 7 hours;

[0020] (3) Gradually cool to below 100°C and release from the furnace to obtain a high-nitrogen silicon-manganese alloy.

[0021] The obtained alloy composition: Mn: 44.37%, si: 22.91%, N: 25.58%, C: 9.8%, P: 0.147%, S:...

Embodiment 2

[0023] (1) With silicon content as 18%, manganese content as 68% silicon manganese alloy, silicon content as 75% ferrosilicon alloy as raw material, weigh 660kg of silicon manganese alloy, 440kg of silicon ferrosilicon alloy, pass through 60 orders after crushing Sieve, after mixing evenly, add 7.5% (88kg) polyvinyl alcohol aqueous solution that accounts for 7.5% of the mass concentration of the material as a binder and carry out wet mixing to make a spherical object with a particle size of 20mm;

[0024] (2) Put the sphere obtained in step (1) into a crucible and send it into a pusher kiln, feed high-purity nitrogen gas, and keep a positive pressure of 20 Pa in the kiln, and react and sinter at 1200 ° C for 6.5 hours;

[0025] (3) Gradually cool to below 100°C and release from the furnace to obtain a high-nitrogen silicon-manganese alloy.

[0026] The obtained alloy composition: Mn: 32.18%, si: 34.37%, N: 33.13%, C: 0.31%, P: 0.076%, S: 0.03%, and the balance is Fe.

Embodiment 3

[0028] (1) With silicon content as 18%, manganese content as 68% silicon manganese alloy, silicon content as 75% ferrosilicon alloy as raw material, take by weighing 480kg of silicon manganese alloy, 520kg of silicon ferrosilicon alloy, pass through 60 orders after crushing Sieve, after mixing evenly, add 9% (99kg) polyvinyl alcohol aqueous solution that accounts for material weight 9% (99kg) and be that the mass concentration is 8% polyvinyl alcohol aqueous solution and carry out wet mixing as binding agent, make the spherical thing that particle diameter is 30mm;

[0029] (2) Put the sphere obtained in step (1) into a crucible and send it into a pusher kiln, feed high-purity nitrogen gas, and keep a positive pressure of 30 Pa in the kiln, and react and sinter at 1150 ° C for 6 hours;

[0030] (3) Gradually cool to below 100°C and release from the furnace to obtain a high-nitrogen silicon-manganese alloy.

[0031] The obtained alloy composition: Mn: 25.3%, si: 60.4%, N: 10.5%...

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Abstract

The invention relates to a steel making nitriding silicon-manganese alloy and a preparation method thereof, belonging to the alloy technical field; the steel making nitriding silicon-manganese alloy comprises the following compositions by weight percent: 25-75% of Mn, 10-60% of Si, 10-38% of N and the balance Fe and other trace elements. The preparation method comprises the following steps: (1) using ordinary silicomanganese and ferrosilicon or ordinary silicomanganese and manganese as raw materials to grind, sieving with a 60 meshes of sieve, mixing the materials evenly, adding 7-9wt% of polyving alcohol water solution used as binder of which the weight percent of polyving alcohol is 8% and then preparing 10-40mm of spheres by wet mixing; (2) placing the spheres in a crucible, sending the crucible into a pusher kiln, injecting high purity nitrogen, keeping 10-70Pa of positive pressure in the kiln to reaction sintering at 1000-1250 DEG C for 5-7h; (3) gradually cooling to under 100 DEG C and finally discharging to obtain the high-nitrogen silicon-manganese alloy.

Description

technical field [0001] The invention belongs to the technical field of alloys, and in particular relates to a silicon-manganese alloy used for steelmaking and microalloying and a preparation method thereof. Background technique [0002] In the production of HRB400 and above rebar, the general method is to add vanadium, niobium or titanium elements to strengthen the steel grades by microalloying. Vanadium-nitrogen alloys, vanadium-iron alloys, or niobium-iron alloys are commonly used in the microalloying process. In the past, vanadium-nitrogen alloy was mostly used. This alloy uses nitrogen to protect vanadium, so that the yield of vanadium is greatly increased. However, due to limited vanadium resources, the production of vanadium-nitrogen alloy is difficult and the price has been high. Therefore, steel mills have adopted niobium. Instead of vanadium-nitrogen alloy, the use of ferroniobium requires higher rolling temperature, which is difficult for rolling equipment to meet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21C7/00
Inventor 仵树仁徐基民周钦堂钱丰收朱瑞青
Owner 郸城财鑫特种金属有限责任公司
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