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High-speed steel powder material and preparation method thereof

A powder material and high-speed steel technology, applied in the field of powder metallurgy high-speed steel, can solve the problems of unable to meet the production requirements of powder metallurgy high-speed steel, low bulk density, low oxygen content, etc. Effect of reducing carbide segregation and reducing oxidation in furnace

Active Publication Date: 2017-12-22
铸金科技(天津)有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] However, because the quality of powder materials has a great influence on powder metallurgy high-speed steel, high-quality powder metallurgy high-speed steel products cannot be discussed without high-quality powder materials. The traditional water atomized powder, due to its uneven shape (non-spherical ), high oxygen content, low bulk density, etc., cannot meet the production requirements of powder metallurgy high-speed steel
[0006] In order to solve the problems existing in the prior art, we propose a high-speed steel powder material with high spheroidization rate, low oxygen content, and high bulk density and its preparation method, so as to meet the needs of powder metallurgy high-speed steel production

Method used

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  • High-speed steel powder material and preparation method thereof
  • High-speed steel powder material and preparation method thereof
  • High-speed steel powder material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A high-speed steel powder material, including the following raw materials in weight percentage, C 1.0%, Cr 3.8%, Mo 4.4%, W 6.2%, V 2.2%, Co 6.0%, Hf 0.5%, and the rest is Fe.

[0065] Milling process:

[0066] 1) Raw material screening and pretreatment: the surface of the selected raw material is dry and clean, and the raw material of the above weight percentage is weighed;

[0067] 2) Drying and roasting: The raw materials are dried and roasted at 600°C to remove the adsorbed water and crystal water.

[0068] 3) Feeding and compacting: Put the raw materials into the induction furnace, compact and cover the furnace cover;

[0069] 4) Rapid temperature rise, 150kg / furnace can be heated to 1580°C within 30 minutes;

[0070] 5) Precipitation deoxidation: use Al, Si, Mn combined precipitation deoxidation, sedation treatment for 6 minutes;

[0071] 6) Final deoxidation: after sedation, raise the temperature to 1580°C and keep it warm, and add 0.05-0.1% mixed rare earth f...

Embodiment 2

[0093] A high-speed steel powder material, including the following raw materials in weight percentage, C 0.9%, Cr 4.0%, Mo 5.0%, W 6.0%, V 2.8%, Co 7.0%, Hf 0.2%, and the rest is Fe.

[0094] Flour making process is with embodiment 1.

[0095] test results:

[0096] 1. Determination of oxygen content:

[0097] The American Leco TC400 nitrogen and oxygen analyzer was used to measure the oxygen content of the prepared powder material, and 10 positions in a batch of powder were randomly selected for testing. The test results are shown in Table 5, and the average oxygen content is 201.3ppm.

[0098] Table 5 Example 2 oxygen content test data

[0099]

[0100] 2. Liquidity test:

[0101] The flowability of the prepared powder material was measured by using the Malvern MS3000 laser particle size analyzer in the United Kingdom, and 10 locations in a batch of powder were randomly selected for testing. The test results are shown in Table 6, and the average flowability reached 15....

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Abstract

The invention belongs to the technical field of powder metallurgy high-speed steel, in particular to a high-speed steel powder material. The high-speed steel powder material comprises the following metal raw materials, by weight percent, 0.8%-1.0% of C, 3.8%-4.2% of Cr, 4.5%-5.2% of Mo, 6%-6.5% of W, 1.6%-2.2% of V, 6%-8% of Co, 0.1%-1% of Hf and the balance Fe. The invention further relates to a preparation method of the high-speed steel powder material. According to the preparation method, rapid temperature rising is adopted, the time that the temperature of 150 kilograms of materials in a furnace reaches 1,580 DEG C can be reduced to 30 minutes from 45 minutes, the time of air suction in the furnace is shortened, and oxidation in the furnace is reduced; a 3-3 deoxidizing agent, namely Al-Si-Mn combined deoxidation is adopted, standing treatment is adopted, and tests prove that the deoxidization effect is better; before molten steel enters a casting ladle, 0.5% sodium fluoroaluminate and calcium fluoride are put into the casting ladle, volatile matters are generated to prevent oxidation in the ladle while the powder is promoted to be refined; and the atomization temperature is strictly controlled to be 1,540 DEG C+ / -15 DEG C, the condition for guaranteeing atomization smoothness is low as much as possible, the granulation rate is advantageously increased, and the powder particle cooling rate is increased.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy high-speed steel, in particular relates to a high-speed steel powder material, and also relates to a preparation method of the above-mentioned high-speed steel split material. Background technique [0002] High-speed steel is a tool steel with high hardness, high wear resistance and high heat resistance, also known as high-speed tool steel or front steel, commonly known as white steel. High-speed steel has good process performance, good strength and toughness, so it is mainly used to manufacture complex thin blades and impact-resistant metal cutting tools, as well as high-temperature bearings and cold extrusion dies. [0003] There are two manufacturing methods of high-speed steel: one is manufactured by traditional smelting and casting ingot method, and the other is manufactured by powder metallurgy method. Traditional smelting and manufacturing are usually divided into secondary refin...

Claims

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Application Information

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IPC IPC(8): C22C38/30C22C38/24C22C38/22B22F1/00B22F9/08C21C7/06C21C7/00
CPCB22F1/0003B22F9/082B22F2009/0848C21C7/00C21C7/0006C21C7/06C22C38/002C22C38/22C22C38/24C22C38/30
Inventor 钱铸
Owner 铸金科技(天津)有限公司
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