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Ferrite stainless steel grain refiner, preparation method and application thereof

A grain refiner, stainless steel technology, applied in the field of grain refinement of metal materials, can solve the problems of unsatisfactory use requirements, easy cracking, complicated preparation process, etc., to solve the problem of cracking in forging and rolling process, refine The effect of ferritic stainless steel grains and simple preparation process

Inactive Publication Date: 2018-10-12
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the production process of ferritic stainless steel, there are mainly problems such as hot processing such as forging and rolling process, which are easy to crack. The finished product cannot meet the requirements of use due to coarse grains
"An Investment Casting Ferritic Stainless Steel Grain Refiner and Its Application Method" published by Chinese patent CN 105033181 A uses Fe powder as an inoculant for grain refinement. The method is simple, but its addition method is to flow Evenly added to the mold, it is impossible to accurately add the refiner; the Chinese patent CN101407866 A published "Fe-Ti-N grain refiner for steel and its preparation method" prepares the grain by feeding nitrogen into the Fe-Ti alloy melt. Grain refiner, its preparation process is comparatively complicated; Chinese patent CN 106312026 published "modifying agent for grain and structure refinement of cast steel" overcomes the simplicity of the production process, but the refiner contains 8-10% V, increased cost; and the above patents are all aimed at die casting, and the current grain refiner has not been well applied in the continuous casting process

Method used

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  • Ferrite stainless steel grain refiner, preparation method and application thereof
  • Ferrite stainless steel grain refiner, preparation method and application thereof
  • Ferrite stainless steel grain refiner, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A method for refining the as-cast structure of ferritic stainless steel is carried out as follows:

[0045] (1), ingredients

[0046] Fe powder and large particle TiN powder are used as raw materials, and the mass fraction of TiN powder is 0.01%.

[0047] (2), preparation of Fe-TiN block

[0048] The prepared raw materials were ground and mixed in a planetary ball mill, and the mixing time was 2.5 hours. It should be noted that the ratio of raw materials to the volume of the grinding tank should not exceed 2 / 3.

[0049] The particle size of the ball-milled TiN powder is less than 2 μm. The ball-milled powder is hot-pressed into a block in a mold. The hot-pressing pressure is 27 MPa, the hot-pressing temperature is 1352 ° C, and the holding time is 6 minutes. After cooling, take it out to obtain a Fe-TiN block.

[0050] (3), melting

[0051] Ferritic stainless steel is smelted in a low carbon steel crucible using a resistance furnace; after the ferritic stainless ste...

Embodiment 2

[0053] A method for refining the as-cast structure of ferritic stainless steel is carried out as follows:

[0054] (1), ingredients

[0055] Fe powder and large particle TiN powder are used as raw materials, and the mass fraction of TiN powder is 0.02% for compounding.

[0056] (2), preparation of Fe-TiN block

[0057]The prepared raw materials were ground and mixed in a planetary ball mill, and the mixing time was 3 hours. The particle size of the ball-milled TiN powder is less than 2 μm. The ball-milled powder is hot-pressed into a block in a mold. The hot-pressing pressure is 25 MPa, the hot-pressing temperature is 1374 ° C, and the holding time is 8 minutes. After cooling, take it out to obtain a Fe-TiN block.

[0058] (3), melting

[0059] Ferritic stainless steel is smelted in a low carbon steel crucible using a resistance furnace; after the ferritic stainless steel is melted, it is pressed into the Fe-TiN block prepared above, wherein the Fe-TiN block is 1 / 2 of the t...

Embodiment 3

[0061] A method for refining the as-cast structure of ferritic stainless steel is carried out as follows:

[0062] (1), ingredients

[0063] Fe powder and large particle TiN powder are used as raw materials, and the mass fraction of TiN powder is 0.03% for compounding.

[0064] (2), preparation of Fe-TiN block

[0065] The prepared raw materials were ground and mixed in a planetary ball mill for 3.5 hours. The particle size of the ball-milled TiN powder is less than 2 μm. The ball-milled powder is hot-pressed into a block in a mold. The hot-pressing pressure is 28 MPa, the hot-pressing temperature is 1365 ° C, and the holding time is 8 minutes. After cooling, take it out to obtain a Fe-TiN block.

[0066] (3), melting

[0067] Ferritic stainless steel is smelted in a low carbon steel crucible using a resistance furnace; after the ferritic stainless steel is melted, it is pressed into the Fe-TiN block prepared above, wherein the Fe-TiN block is 1 / 2 of the total mass of the f...

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Abstract

The invention relates to a ferrite stainless steel grain refiner, a preparation method and an application method thereof. The ferrite stainless steel grain refiner comprises TiN and Fe powder in massratio of (0.01-0.06): (99.99-99.94). The ferrite stainless steel grain refiner provided by the invention achieves the effect of refining ferrite stainless steel grains by inducing nucleation of transgranular ferrite, solves a series of problems in production and application processes as the grains of the ferrite stainless steel are thick, and can be applied to die casting and continuous casting processes.

Description

technical field [0001] The invention relates to a grain refiner for ferritic stainless steel, which belongs to the technical field of grain refinement of metal materials. Background technique [0002] Compared with chromium-nickel austenitic stainless steel, ferritic stainless steel has high strength, low tendency of cold work hardening, high thermal conductivity (130% to 150%), low linear expansion coefficient (60% to 70%), Good corrosion resistance and other advantages. Due to the fluctuation of scrap steel and nickel resources, the expansion of chromium-series ferritic stainless steel has become the focus of structural adjustment of global stainless steel varieties. [0003] In the production process of ferritic stainless steel, there are mainly problems such as hot processing such as forging and rolling process, which are easy to crack. The finished product cannot meet the requirements of use due to coarse grains. "An Investment Casting Ferritic Stainless Steel Grain ...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C5/00C22C38/14B22D11/116
CPCC21C7/0006B22D11/116C21C5/005C22C38/001C22C38/14
Inventor 李阳杨光姜周华徐光陈常勇杜鹏飞白璐王琦
Owner NORTHEASTERN UNIV
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