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
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[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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