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Low-tap-density 316 powder and preparation method thereof

A technology of tap density and powder, which is applied in the field of low tap density 316 powder and its preparation, can solve the problems of high impurity content of 316 powder, small mass fraction of C element, poor air permeability, etc., and achieve a wide range of filtration accuracy and low oxygen content Controllable, mechanically robust effect

Inactive Publication Date: 2020-09-25
江苏萌达新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current 316 powder has a high impurity content, a small mass fraction of C element, and poor air permeability.

Method used

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  • Low-tap-density 316 powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A kind of preparation method of low tap density 316 powder, concrete steps are as follows:

[0013] (1) Mix Si0.3%, Cr16%, Mn0.3%, Ni12%, and Fe5 raw materials in proportion, put them into a 250Kg intermediate frequency furnace for smelting, and melt for about 1 hour. After the steel is liquefied and cleared, the temperature is raised to 1600°C and passed through 100Mpa. High-pressure water atomization into powder;

[0014] (2) After atomization, the powder is dried, sieved, and batched together to obtain the finished product.

Embodiment 2

[0016] A kind of preparation method of low tap density 316 powder, concrete steps are as follows:

[0017] (1) Mix Si1.0%, Cr18%, Mn1.2%, Ni14%, and Fe5 raw materials in proportion, put them into a 250Kg intermediate frequency furnace for smelting, melt for about 1 hour, and heat up to 1650°C after the steel is liquefied and cleared, passing through 110Mpa High-pressure water atomization into powder;

[0018] (2) After atomization, the powder is dried, sieved, and batched together to obtain the finished product.

Embodiment 3

[0020] A kind of preparation method of low tap density 316 powder, concrete steps are as follows:

[0021] (1) Mix Si0.7%, Cr17%, Mn0.9%, Ni13%, and Fe5 raw materials in proportion, put them into a 250Kg intermediate frequency furnace for smelting, melt for about 1 hour, and heat up to 1625°C after the steel is liquefied and cleared, passing through 105Mpa High-pressure water atomization into powder;

[0022] (2) After atomization, the powder is dried, sieved, and batched together to obtain the finished product.

[0023] Table I

[0024]

[0025] It can be seen from the above table that the low tap density 316 powder C element mass fraction produced by the present invention is less than or equal to 0.03%, and the powder has an irregular shape. After pressing and sintering, the finished product has high mechanical strength, good air permeability, and high temperature resistance. Wide range of filtration accuracy.

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Abstract

The invention discloses low-tap-density 316 powder. The low-tap-density 316 powder consists of the following alloy elements in percentage 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 powder is controllable in powder oxygen content, is low in impurity content, and has an element C with mass fraction smaller than or equal to 0.03%. The powder has anirregular morphology, is high in finished product mechanical strength after being pressed and sintered, is good in gas permeability, is resistant to a high temperature, and is wider in filter precision range. Moreover, a laser particle size is 20-30[mu]m, oxygen content is smaller than 0.28%, and tap density is smaller than or equal to 3.8 g / cm<3>.

Description

technical field [0001] The invention relates to the technical field of stainless steel powder, in particular to a low tap density 316 powder and a preparation method thereof. Background technique [0002] Stainless steel powder sintered filter material is a micro-filter element made of 316 powder as raw material, which is screened, formed and sintered. High filtration precision, good air permeability, high mechanical strength, widely used in chemical industry, environmental protection and other fields. However, the current 316 powder has a high impurity content, a small mass fraction of C element, and poor air permeability. Contents of the invention [0003] The object of the present invention is to provide a kind of low tap density 316 powder and its preparation method aiming at the defects and deficiencies of the prior art. [0004] In order to achieve the above object, the technical solution adopted in the present invention is: a low tap density 316 powder, and its in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/40C22C38/04C22C38/02B22F1/00B22F9/08
CPCB22F1/0003B22F9/082B22F2009/0828C22C38/02C22C38/04C22C38/40
Inventor 赵军喜
Owner 江苏萌达新材料科技有限公司
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