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Sintering process capable of reducing magnetic conductivity of 316L stainless steel material

A technology of stainless steel and magnetic permeability, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problem of magnetic permeability reduction, achieve reduced magnetic permeability, low magnetic permeability performance, and reduce The effect of iron content

Pending Publication Date: 2021-05-28
SHENZHEN SHINDY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the Ni content of the national standard or American standard 316L material is 10-14%, but when the Ni content is between 10-11%, the sintered product is easy to have a magnetic permeability > 1.02ut. Therefore, the sintered product magnetic Conductivity reduction has become a technical problem to be solved urgently by those skilled in the art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The following technical solutions provided in this embodiment:

[0025] A kind of sintering process that can reduce the magnetic permeability of 316L stainless steel material, comprises the following steps:

[0026] S1. Feed the stainless steel plastic base first and make a sample blank through injection molding equipment;

[0027] S2. Putting the sample blank prepared in S1 into a high-temperature furnace for high-temperature calcination, and continuously feeding nitrogen gas during the calcination process;

[0028] S3, after the high-temperature calcination is completed, let it stand still to room temperature, and then put it into cold water for soaking;

[0029] S4, removing the surface impurities precipitated on the surface of the sample blank after the soaking treatment;

[0030] S5. For the products sintered in S4, use Hengpu sintering furnace to perform nitriding heat treatment, and then quickly cool down to room temperature;

[0031] S6. Carry out a magnetic ...

Embodiment 2

[0039] The following technical solutions provided in this embodiment:

[0040] A kind of sintering process that can reduce the magnetic permeability of 316L stainless steel material, comprises the following steps:

[0041] S1. Feed the stainless steel plastic base first and make a sample blank through injection molding equipment;

[0042] S2. Putting the sample blank prepared in S1 into a high-temperature furnace for high-temperature calcination, and continuously feeding nitrogen gas during the calcination process;

[0043] S3, after the high-temperature calcination is completed, let it stand still to room temperature, and then put it into cold water for soaking;

[0044] S4, removing the surface impurities precipitated on the surface of the sample blank after the soaking treatment;

[0045] S5. For the products sintered in S4, use Hengpu sintering furnace to perform nitriding heat treatment, and then quickly cool down to room temperature;

[0046] S6. Carry out a magnetic ...

Embodiment 3

[0054] The following technical solutions provided in this embodiment:

[0055] A kind of sintering process that can reduce the magnetic permeability of 316L stainless steel material, comprises the following steps:

[0056] S1. Feed the stainless steel plastic base first and make a sample blank through injection molding equipment;

[0057] S2. Putting the sample blank prepared in S1 into a high-temperature furnace for high-temperature calcination, and continuously feeding nitrogen gas during the calcination process;

[0058] S3, after the high-temperature calcination is completed, let it stand still to room temperature, and then put it into cold water for soaking;

[0059] S4, removing the surface impurities precipitated on the surface of the sample blank after the soaking treatment;

[0060] S5. For the products sintered in S4, use Hengpu sintering furnace to perform nitriding heat treatment, and then quickly cool down to room temperature;

[0061] S6. Carry out a magnetic ...

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Abstract

The invention relates to the technical field of stainless steel sintering, in particular to a sintering process capable of reducing the magnetic conductivity of a 316L stainless steel material. The equipment comprises the following steps: S1, firstly taking a stainless steel plastic-based feed and preparing the stainless steel plastic-based feed into a sample blank through injection molding equipment; S2, putting the sample blank prepared in the step S1 into a high-temperature furnace for high-temperature calcination, and continuously introducing nitrogen in the calcination process; S3, after the high-temperature calcination is finished, standing to room temperature, and then putting into cold water for soaking treatment; S4, removing surface impurities separated out from the surface of the sample blank subjected to soaking treatment; S56, carrying out nitriding heat treatment on the product sintered in the step S4 by adopting a constant-ordinary sintering furnace, and then rapidly cooling to room temperature; and S6, carrying out magnetic conductivity test on the product subjected to heat treatment in the step S5. According to the sintering heating treatment nitriding process, the nitrogen atmosphere is adopted in the heat treatment process, the magnetic conductivity of the product can be effectively reduced, and the magnetism of the product is guaranteed.

Description

technical field [0001] The invention relates to the technical field of stainless steel sintering, in particular to a sintering process capable of reducing the magnetic permeability of 316L stainless steel materials. Background technique [0002] Metal Injection Molding (MIM for short) is a new type of powder metallurgy near-net forming technology derived from the plastic injection molding industry. The basic process steps of metal injection molding are: first, select the metal powder that meets the requirements of MIM and Binder, and then use appropriate method to mix the powder and binder at a certain temperature to form a uniform feed, after granulation, injection molding, the obtained formed body is sintered and densified after degreasing treatment to become the final product. At present, the main material of MIM is stainless steel, and the non-magnetic stainless steel material is mainly austenitic stainless steel, among which 316L accounts for more than 80% of the market...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F3/10B22F3/24C23C8/26
CPCB22F3/225B22F3/1007B22F3/24C23C8/26B22F2201/02B22F2998/00B22F2003/248B22F2998/10C21D2211/001
Inventor 李继坪
Owner SHENZHEN SHINDY TECH
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