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Heat-resistant alloy steel powder for MIM, preparation method and equipment thereof

A powder preparation and alloy steel technology, applied in the field of alloy steel powder, can solve problems such as intergranular corrosion, and achieve the effects of good sphericity, controllable oxygen content, and high high temperature strength

Inactive Publication Date: 2021-08-13
江苏萌达新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the commonly used 304L, 316L and other powder products are sensitized and precipitated chromium carbide at high temperature, resulting in intergranular corrosion.

Method used

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  • Heat-resistant alloy steel powder for MIM, preparation method and equipment thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A heat-resistant alloy steel powder for MIM, comprising the following mass percentages: Si0.7-1.2%, Cr24-27%, Mn0.2-1.2%, Nb1.0-1.5%, Ni19-22%, C0.3- 0.7%, Ti0.2-0.6%, the balance is Fe; and the laser particle size is between 7.0-9.0μm, the oxygen content is less than 0.4%, and the tap density is ≥4.8g / cm 3 .

[0020] According to the mass ratio of the above components, the heat-resistant alloy steel powder for MIM is prepared, which specifically includes the following steps:

[0021] S1. Mix 9 kinds of raw materials such as monocrystalline silicon, micro-carbon ferrochrome, high-carbon ferrochrome, ferromanganese, electrolytic nickel, carbon sheet, ferro-niobium, sponge titanium, and industrial pure iron in proportion, and put them into a 250Kg intermediate frequency furnace for smelting. The raw materials are melted in the intermediate frequency furnace, and then the molten steel is heated to 1600-1650°C and poured into the tundish. The molten steel enters the atomiz...

Embodiment 2

[0024] A heat-resistant alloy steel powder equipment for MIM. The equipment is an atomizer, which includes a tundish 1, a nitrogen gas furnace 2 and a high-pressure water furnace 3 from top to bottom. The top of the tundish is open and used for pouring molten steel; The outer ring of furnace 2 is provided with several nitrogen gas inlets 21, and the nitrogen gas inlets are at an angle of 10-20 degrees; the outer ring of high-pressure water furnace 3 is provided with a plurality of high-pressure water inlets 31, and the high-pressure water inlets are in two An included angle, the upper angle is 35-60 degrees, and the lower angle is 20-35 degrees. Melt the raw materials in an intermediate frequency furnace, then heat the molten steel to 1600-1650°C, pour it into the tundish 1, the molten steel enters the atomizer from the tundish 1, and the low-pressure nitrogen enters from the nitrogen gas inlet 21, and the molten steel first It is torn into a brush shape by 1Mpa-5Mpa low-press...

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Abstract

The invention discloses heat-resistant alloy steel powder for MIM, a preparation method and equipment thereof. The heat-resistant alloy steel powder comprises the following components in percentage by by mass: 0.7 to 1.2 percent of Si, 24 to 27 percent of Cr, 0.2 to 1.2 percent of Mn, 1.0 to 1.5 percent of Nb, 19 to 22 percent of Ni, 0.3 to 0.7 percent of C, 0.2 to 0.6 percent of Ti and the balance Fe. The laser particle size is 7.0-9.0 [mu] m, the oxygen content is less than 0.4 percent, and the tap density is greater than or equal to 4.8 g / cm < 3 >. The powder provided by the invention is uniform in alloy component, controllable in oxygen content, low in impurity content and high in tap density, and the powder obtained through the method is similar to a sphere and is high in sintering density, high in high-temperature strength and good in corrosion resistance; the powder provided by the invention contains carbon-philic elements such as Ti and Nb, so that precipitation of chromium carbide is inhibited at high temperature, and meanwhile, the powder is resistant to acid and high in high-temperature strength; the powder prepared through water-gas combined atomization is low in oxygen content, fine and beneficial to sintering, and the product is high in density and good in appearance; and meanwhile, the powder sphericity is good, feeding is facilitated, shrinkage in the product sintering process is small, and the size precision is high.

Description

technical field [0001] The invention relates to the technical field of alloy steel powder, in particular to a heat-resistant alloy steel powder for MIM, a preparation method and equipment thereof. Background technique [0002] MIM powder is mostly made of stainless steel powder, low-alloy steel powder, etc., and is a small component made by feeding, injection, degreasing, sintering, and post-processing. The composition is uniform, the impurity content is low, the shape is complex, the cost is low, the efficiency is high, and the size accuracy is high. It is widely used in medical, electronic, military and other fields. However, the commonly used 304L, 316L and other powder products are sensitized and precipitated chromium carbide at high temperature, resulting in intergranular corrosion. Because the powder of the present invention contains carbon-loving elements such as Ti and Nb, it can inhibit the formation and precipitation of chromium carbide at high temperature, and at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/22B22F9/08C22C38/02C22C38/04C22C38/48C22C38/50
CPCB22F1/0003B22F3/225B22F9/082C22C38/02C22C38/04C22C38/48C22C38/50
Inventor 赵军喜
Owner 江苏萌达新材料科技有限公司
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