阅读说明：本技术 一种低振实密度316粉末及其制备方法 (Low-tap-density 316 powder and preparation method thereof ) 是由 赵军喜 于 2020-04-27 设计创作，主要内容包括：本发明公开一种低振实密度316粉末,所述低振实密度316粉末的合金元素质量百分比为Si0.3-1.0％、Cr16-18％、Mn0.3-1.2％、Ni12-14％、余量为Fe。本发明粉末氧含量可控,杂质含量低,C元素质量分数小于等于0.03％；此方法粉末呈不规则形貌,压制烧结后成品机械强度高,透气性好,耐高温,过滤精度范围较广；激光粒度在20～30μm之间,氧含量小于0.28％,振实密度≤3.8g/cm<Sup>3</Sup>。(The invention discloses low tap density 316 powder, which comprises, by mass, 0.3-1.0% of Si, 16-18% of Cr, 0.3-1.2% of Mn, 12-14% of Ni and the balance of Fe. The oxygen content of the powder is controllable, the impurity content is low, and the mass fraction of the C element is less than or equal to 0.03 percent; the powder is in irregular shape, and the pressed and sintered product has high mechanical strength, good air permeability, high temperature resistance and wider filtration precision range; the laser granularity is between 20 and 30 mu m, the oxygen content is less than 0.28 percent, and the tap density is less than or equal to 3.8g/cm 3 。)

1. A low tap density 316 powder characterized by: the low tap density 316 powder comprises, by mass, 0.3-1.0% of Si, 16-18% of Cr, 0.3-1.2% of Mn, 12-14% of Ni and the balance of Fe.

2. A method for preparing the low tap density 316 powder of claim 1, comprising the steps of:

(1) the preparation method comprises the steps of proportioning 5 raw materials of Si, Cr, Mn, Ni and Fe according to a proportion, putting the raw materials into a 250Kg intermediate frequency furnace for smelting, melting for about 1 hour, heating to 1600-1650 ℃ after molten steel is molten and cleared, and atomizing the molten steel into powder by high-pressure water of 110Mpa at 100-1650 ℃;

(2) and drying, screening and batching the atomized powder to obtain a finished product.

Technical Field

The invention relates to the technical field of stainless steel powder, in particular to low tap density 316 powder and a preparation method thereof.

Background

The stainless steel powder sintered filter material is a micro-filter element which is prepared by taking 316 powder and the like as raw materials and carrying out sieving, molding and sintering. High filtering precision, good air permeability and high mechanical strength, and can be widely used in the fields of chemical industry, environmental protection and the like. However, the existing 316 powder has high impurity content, small mass fraction of C element and poor air permeability.

Disclosure of Invention

The invention aims to provide a low tap density 316 powder and a preparation method thereof, aiming at the defects and shortcomings of the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: a low tap density 316 powder is characterized in that: the low tap density 316 powder comprises, by mass, Si 0.3-1.0%, Cr 16-18%, Mn 0.3-1.2%, Ni 12-14%, and the balance Fe, and has a laser particle size20-30 μm, oxygen content less than 0.28%, tap density less than or equal to 3.8g/cm³。

The preparation method of the low tap density 316 powder is characterized by comprising the following specific steps:

(1) the preparation method comprises the steps of proportioning 5 raw materials of Si, Cr, Mn, Ni and Fe according to a proportion, putting the raw materials into a 250Kg intermediate frequency furnace for smelting, melting for about 1 hour, heating to 1600-1650 ℃ after molten steel is molten and cleared, and atomizing the molten steel into powder by high-pressure water of 110Mpa at 100-1650 ℃;

(2) and drying, screening and batching the atomized powder to obtain a finished product.

The invention has the beneficial effects that:

the oxygen content of the powder is controllable, the impurity content is low, and the mass fraction of the C element is less than or equal to 0.03 percent; the powder prepared by the method has irregular shape, and the pressed and sintered product has high mechanical strength, good air permeability, high temperature resistance and wider filtration precision range.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail with reference to the following embodiments. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.