Fe-x-c grain refiner and preparation method thereof

A grain refiner, fe-x-c technology, applied in the field of grain refiner and its preparation, can solve problems such as easy segregation, and achieve the effects of simple preparation, low cost and grain refinement

Inactive Publication Date: 2011-12-14
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively small size of TiN particles, it is difficult to add it to the melt by blowing and wire feeding, and it is easy to segregate

Method used

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  • Fe-x-c grain refiner and preparation method thereof
  • Fe-x-c grain refiner and preparation method thereof
  • Fe-x-c grain refiner and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] As shown in Table 1, the preparation process of this embodiment includes the following steps:

[0029] Step 1, mixing Fe-C alloy with metal Ti, melting the mixture in a vacuum intermediate frequency induction furnace to obtain a melt; the mixing needs to make the mass percentage of each element in the obtained mixture: Fe 99.4%, Ti 0.5% , C 0.1%;

[0030] Step 2, when the temperature of the melt is 1650°C, feed argon into the melt, the flow rate of the argon is 1000ml / min, and the time is 3h;

[0031] Step 3: Stop feeding the argon gas, cut off the power, and obtain the steel grain refiner.

[0032] The TiC particle size in the grain refiner prepared in this example is mainly concentrated in 0.5-5 μm, and the TiC density is 10 4 piece / mm 3 .

[0033] After heating 409L ferritic stainless steel to 1530°C in a vacuum intermediate frequency induction furnace, the molten steel is cast. The macrostructure of 409L steel without adding refiner is as follows figure 2 As ...

Embodiment 2

[0035] As shown in Table 1, the preparation process of this embodiment includes the following steps:

[0036] Step 1, mixing Fe-C alloy with metal Ti, metal V and metal Nb, melting the mixture in a vacuum intermediate frequency induction furnace to obtain a melt; the mixing needs to make the mass percentage of each element in the obtained mixture: Fe 35%, Ti 25%, Nb 25%, C 15%;

[0037] Step 2, when the temperature of the melt is 1600°C, argon is introduced into the melt, the flow rate of the argon is 500ml / min, and the time is 1.5h;

[0038] Step 3: Stop feeding the argon gas, cut off the power, and obtain the steel grain refiner.

[0039] The particle density of XC in the grain refiner prepared in this embodiment is 10 7 piece / mm 3 . The grain refiner prepared in this embodiment can refine the grains of the steel, so that the proportion of equiaxed grain regions in the as-cast structure of the billet can be increased.

Embodiment 3

[0041] As shown in Table 1, the preparation process of this embodiment includes the following steps:

[0042] Step 1, mix pure iron, graphite with metal Ti, metal V and metal Nb, and melt the mixture in a vacuum intermediate frequency induction furnace to obtain a melt; the mixing needs to make the mass percentage of each element in the obtained mixture: Fe 67.5%, Ti 10%, V 5%, Nb 10%, C 7.5%;

[0043] Step 2, when the temperature of the melt is 1550°C, feed argon into the melt, the flow rate of the argon is 100ml / min, and the time is 10s;

[0044] Step 3: Stop feeding the argon gas, cut off the power, and obtain the steel grain refiner.

[0045] The XC density in the grain refiner prepared in this embodiment is 10 8 piece / mm 3 . The grain refiner prepared in this embodiment can refine the grains of the steel, so that the proportion of equiaxed grain regions in the as-cast structure of the billet can be increased.

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Abstract

An Fe-X-C grain refiner in the technical field of metal materials and a preparation method thereof. Fe-X-C grain refiner, its composition and mass percentage are: Fe 35-99.4%, C 0.1-15%, X 0.5-50%; wherein, X is one or more of Ti, V and Nb kind. The preparation method of Fe-X-C grain refiner comprises the following steps: step 1, take Fe-C alloy, mix with metal X; Or, take pure iron and graphite, mix with metal X afterwards; The melt is melted in the furnace; in the mixture, Fe is 35-99.4%, C is 0.1-15%, and the balance is X; step 2, when the temperature of the melt is 1550-1650°C, feed argon into the melt , the time is 10s ~ 3h; Step 3, stop feeding argon, cut off the power, and get the Fe-X-C grain refiner. The grain refiner of the invention is easy to prepare; adding the grain refiner of the invention to the steel melt can refine the grains of the steel and increase the ratio of the equiaxed grain area of ​​the as-cast structure of the billet to more than 60%.

Description

[0001] The present invention is based on the patent application number: 200910307631.7, the patent application name is: "Fe-X-C grain refiner and its preparation method", the patent applicant is: Shanghai Jiaotong University, Baoshan Iron and Steel Co., Ltd., and the patent application date is: Divisional patent application on September 24, 2009. technical field [0002] The invention relates to a grain refiner in the technical field of metal materials and a preparation method thereof, in particular to an Fe-X-C grain refiner and a preparation method thereof. Background technique [0003] The structure of steel determines its performance, especially its strength and toughness. The finer the grain, the higher the strength and toughness of the steel. In the continuous casting process, if it is only cooled from the outside, the cooling rate inside the wide and thick billet is slow, and the nucleation core is less, and it will mainly grow in the form of columnar grains, resulti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/10C22C1/02B22D11/11
Inventor 高海燕阮晓明沈建国王超孙宝德郑庆王俊刘自立
Owner SHANGHAI JIAO TONG UNIV
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