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Low-cost MIM manufacturing process for high-nitrogen and non-magnetic high-strength stainless steel part

A manufacturing process, stainless steel technology, applied in the field of metal powder injection molding, powder metallurgy, can solve the problems of poor products, high prices, unable to reach the level of mass production, etc.

Inactive Publication Date: 2018-12-18
SHANGHAI FUTURE HIGH-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, almost all MIM manufacturers adopt the feeding system and technical solutions of BASF in Germany, which is not only expensive (about 300 yuan / Kg), but also has the risk of overall defective products due to raw material problems.
If self-made feed is used, the conventional process provided in the literature, especially the sintering process, will have extremely poor dimensional stability and cannot reach the level of mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The mobile phone camera ring produced by this technical solution has a density of 7.6g / cm 3 More than 10,000 products in a full furnace, the standard deviation of the total length of 34mm is 0.03, the neutral salt spray test at 35°C after solid solution is greater than 48H, the relative magnetic permeability is less than 1.01, the microhardness is HV280-320, and the yield strength is 600-630MPa.

[0021] The specific implementation plan is as follows:

[0022] 1) Feed material preparation: use domestic gas atomization-500 mesh Fe17Cr11Mn3Mo powder and binder in a mass ratio of 92:8 to knead and granulate on a kneading and extruding integrated machine, wherein the content of each component in the binder system is as follows : polyoxymethylene (POM): high-density polyethylene (HDPE): polypropylene (PP): stearic acid (SA): other additives = 70:5:20:2:3.

[0023] 2) Forming: Form the feed material prepared in 1) on the injection machine according to a suitable process to f...

Embodiment 2

[0028] The difference from Example 1 is that in step 1), the binder system is composed of 60wt.% polyoxymethylene (POM), 10wt.% high-density polyethylene (HDPE), 20% polypropylene (PP), 5 % stearic acid (SA) and 5% other additives; the mass fraction that described binding agent accounts for feeding is 8%.

Embodiment 3

[0030] The difference from Example 1 is: in step 1), the binder system is composed of 80wt.% polyoxymethylene (POM), 5wt.% high-density polyethylene (HDPE), 10% polypropylene (PP), 2% stearic acid (SA) and 3% other additives; the mass fraction of the binder in the feed is 8%.

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PUM

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Abstract

The invention discloses a low-cost MIM manufacturing process for a high-nitrogen and non-magnetic high-strength stainless steel part. The low-cost MIM manufacturing process comprises the steps of rawmaterial preparation, forming, degreasing, sintering and solid solution; in the step of sintering, a billet after catalytic degreasing is sintered to be dense by adopting a vacuum batch furnace, the sintering process is conducted under the whole-process nitrogen atmosphere, and the nitrogen atmosphere sintering is mainly carried out in two steps of the first low pressure sintering for being denseand the second high-pressure nitriding for ensuring the performance; and the low-pressure sintered nitrogen pressure is 10-30 kpa, the intake flow is 20-50 L / min, the sintering temperature is 1150-1250 DEG C, the heat insulation time is 90-360 min, the high-pressure nitriding nitrogen pressure is 60-90 kpa, the intake flow is 20-50 L / min, the sintering temperature is 1280-1320 DEG C, and the heatinsulation time is 90-120 min. By means of the low-cost MIM manufacturing process, the mass production feasibility of the self-made feeding which is cheaper than BASF feeding is achieved, and the shortcomings that the dimensional stability is poor, and the performance is difficult to guarantee when the self-made feeding adopts a conventional sintering process for mass production are overcome.

Description

technical field [0001] The invention relates to a low-cost MIM manufacturing process of high-nitrogen, non-magnetic and high-strength stainless steel parts, in particular to a manufacturing process of Fe17Cr11Mn3Mo material, belonging to the fields of powder metallurgy and metal powder injection molding. Background technique [0002] Nickel-free high-nitrogen austenitic stainless steel is a new type of steel developed this year that uses nitrogen instead of nickel to stabilize the austenite structure. The nitrogen content in this type of stainless steel is greater than 0.4wt.%, thereby significantly improving the mechanical properties of the steel And corrosion resistance, the composition characteristics of nickel-free also solve the human nickel allergic reaction caused by traditional nickel-containing stainless steel used as wearable products or human implants, so nickel-free high-nitrogen austenitic stainless steel is widely used in industrial and biomedical fields All ha...

Claims

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Application Information

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IPC IPC(8): B22F3/22
CPCB22F3/225B22F2999/00B22F2998/10B22F3/1007B22F2201/02B22F1/107B22F2003/248B22F3/1021
Inventor 王明月邓忠勇段满堂
Owner SHANGHAI FUTURE HIGH-TECH CO LTD
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