Method for preparing fine spherical stainless steel powder

A stainless steel powder and spherical technology, applied in the field of preparation of fine spherical stainless steel powder, can solve the problems of restricting the popularization and application of gas atomized stainless steel powder, affecting the performance of stainless steel products, coarse powder particle size, etc., achieving easy automatic control and widening the scope of application , the effect of uniform distribution of elements

Inactive Publication Date: 2014-12-24
SUZHOU ZHIYAN NEW MATERIAL TECH CO LTD
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Problems solved by technology

[0004] The traditional preparation methods of fine spherical stainless steel powder are water atomization method and gas atomization method, but there are great differences in the quality, performance and cost of stainless steel powder prepared by these two methods, which are mainly reflected in the following aspects: (1 ) Water atomization powder has certain advantages in powder fineness and cost, but the powder is basicall

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  • Method for preparing fine spherical stainless steel powder
  • Method for preparing fine spherical stainless steel powder

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Example Embodiment

[0018] The preparation method of the fine spherical stainless steel powder of the present invention includes the following steps:

[0019] First, directly select 316L stainless steel powder or use C, Si, S, P, Fe, Cr, Ni, Mo, Mn elements to form an alloy feed. Since the raw materials can be prepared according to the material requirements and the appropriate ratio of elements can be selected, the element design can be carried out according to the material requirements, which broadens the scope of application of the raw materials, and can select relatively cheap and inexpensive raw materials.

[0020] Then, hydrogen or argon is used as a carrier gas to send the above alloy feed or 316L stainless steel powder into a plasma torch for vaporization and smelting to form an alloy body. The high-frequency plasma equipment used in this step is such as figure 1 As shown, it mainly includes a feeder, a plasma torch, an RF generator (radio frequency generator), a heat exchange chamber and a gas...

Example Embodiment

[0023] Example one

[0024] This embodiment provides a method for preparing fine spherical stainless steel powder, which includes the following steps:

[0025] (A) Select 316L stainless steel powder;

[0026] (B) Using argon as the carrier gas, the stainless steel powder is sent to the plasma torch for vaporization and smelting to form an alloy body. The flow rate of the carrier gas is 0.5m 3 / h, the feed rate is 5g / min, the power of the plasma torch is 50kW, and the gas flow rate is 1m 3 / h of argon gas, side gas flow rate 1m 3 / h of argon, the pressure is negative pressure 200mm Hg;

[0027] (C) Introduce the alloy body into a heat exchange room with a temperature of 150℃, and use a flow rate of 1m for heat exchange 3 / h of argon;

[0028] (D) Introduce the fine spherical stainless steel powder into the gas-solid separation chamber to collect the solid powder.

Example Embodiment

[0029] Example two

[0030] This embodiment provides a method for preparing fine spherical stainless steel powder, which includes the following steps:

[0031] (A) Select C, Si, S, P, Fe, Cr, Ni, Mo, Mn elements to form an alloy feed in proportion, where C≤0.03%, Si≤1%, Mn≤2%, P≤0.035% , S≤0.03%, Ni is 10%~14%, Cr is 16%~18%, Mo is 2%~3%, the balance is Fe (mass ratio);

[0032] (B) Using hydrogen as the carrier gas to feed the alloy feed into the plasma torch for vaporization and smelting to form an alloy body, the flow of the carrier gas is 5m 3 / h, the feeding rate is 100g / min, the power of the plasma torch is 5kW, and the gas flow rate is 3m 3 / h of argon gas, side gas flow rate 20m 3 / h of argon, the pressure is negative pressure 50mm Hg;

[0033] (C) Introduce the alloy body into the heat exchange room at a temperature of 150℃, and use a flow rate of 1 m for heat exchange 3 / h of hydrogen;

[0034] (D) Introduce the fine spherical stainless steel powder into the gas-solid separat...

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Abstract

The invention relates to a method for preparing fine spherical stainless steel powder. The method comprises the following steps of (a) selecting stainless steel powder or preparing C, Si, S, P and other elements into an alloy feed; (b) sending the stainless steel powder or the alloy feed into a plasma torch for vaporization smelting by using hydrogen or argon as carrier gas so as to obtain an alloy body; (c) performing heat exchange on the alloy body to obtain the fine spherical stainless steel powder; (d) introducing the fine spherical stainless steel powder into a gas-solid separation chamber to collect solid powder. According to the method, the stainless steel powder is utilized, or C, Si, S, P and other elements are prepared into the alloy feed, a raw material can be prepared by an element mixing method, and the application range of the raw material is widened; the carrier gas is utilized to feed the raw material into the plasma torch, and the fine spherical stainless steel powder is formed through heat exchange, so that the raw material scattering uniformity is improved, and the stainless steel powder with uniformly distributed elements and uniformly distributed particle size is formed.

Description

technical field [0001] The invention relates to a preparation method of stainless steel powder, in particular to a preparation method of fine spherical stainless steel powder. Background technique [0002] With the development of 3D printing and modern powder metallurgy technology, there are more and more types of stainless steel products, and they are developing in the direction of high strength, high density and high precision. [0003] 316L stainless steel is widely used in aviation, aerospace, marine engineering, automobile industry, bioengineering and other fields because of its low density, high specific strength, good corrosion resistance, and excellent heat resistance. It is an important foundation Industrial raw materials. The fine spherical 316L stainless steel powder shows unique advantages in chemical activity, mechanical properties, fluidity, bulk density, etc., and is often used in laser rapid prototyping and other fields. With the continuous development of ...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 方鹏
Owner SUZHOU ZHIYAN NEW MATERIAL TECH CO LTD
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