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
View PDF6 Cites 5 Cited by
  • 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 Chines

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Example Embodiment

[0043] Example 1

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

[0045] (1) Ingredients

[0046] Fe powder and large-grain TiN powder are used as raw materials, and the mass fraction of TiN powder is 0.01%. The particle size of the large-grain TiN powder used is between 4 and 5 μm.

[0047] (2) Preparation of Fe-TiN block

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

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

[0050] (3), smelting

[0051] The ferritic stainless steel is smelted in a low-carbon steel crucible us...

Example Embodiment

[0052] Example 2

[0053] A method for refining the as-cast structure of ferritic stainless steel is 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%.

[0056] (2) Preparation of Fe-TiN block

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

[0058] (3), smelting

[0059] The ferritic stainless steel is smelted in a low-carbon steel crucible using a resistance furnace; after the ferritic stainless steel is melted, pressed into the Fe-TiN block prepared above, where the Fe-TiN block is based on TiN as the total mass of the ferritic stainless ...

Example Embodiment

[0060] Example 3

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

[0062] (1) Ingredients

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

[0064] (2) Preparation of Fe-TiN block

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

[0066] (3), smelting

[0067] The ferritic stainless steel is smelted in a low-carbon steel crucible using a resistance furnace; after the ferritic stainless steel is melted, pressed into the Fe-TiN block prepared above, where the Fe-TiN block is based on TiN as the total mass of the ferritic ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap