Nitrogen-containing nickel-free stainless steel and metallurgy forming process for powder thereof

A powder metallurgy and forming process technology, applied in the field of nitrogen-containing nickel-free stainless steel and its powder metallurgy preparation process, can solve the problems of medical nickel-containing stainless steel human health hazards, expensive nickel and other problems, saving resources, reducing product costs, high The effect of compactness

Inactive Publication Date: 2009-01-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a nitrogen-containing nickel-free stainless steel material and its powder metallurgy forming process, which solves the problems of high nickel price in nickel-containing stainless steel and the harm of medical nickel-containing stainless steel to human health, and obtains a high degree of densification. Resource-saving nickel-free stainless steel material with excellent mechanical properties and corrosion resistance, reducing process costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: particle size is -400 purpose nitrogen-containing stainless steel powder and multi-component binder

[0018] The main chemical composition of -400 mesh gas atomized nitrogen-containing nickel-free stainless steel powder is Cr 17.1%, Mn 11.7%, Mo2.41%, N 0.46%, C 0.019%, Si 0.5%, P+S 0.024% and trace impurities element, and the balance is Fe; the mass proportioning of binder paraffin (PW), high-density polyethylene (HDPE), stearic acid (SA) three kinds of polymers is determined as PW: HDPE: SA=70: 29: 1 .

[0019] The binder and the raw material powder were mixed on a double-roll rubber mixer according to the volume fraction of 64%. The mixing temperature was 140°C and the mixing time was 90 minutes. After mixing evenly, it was broken into injection feed, and then the The molded blank is obtained by injection on the feeding injection machine, the injection temperature (at the nozzle) is 170°C, and the injection pressure is 100MPa. The injection blank has ...

Embodiment 2

[0024] Embodiment 2: particle size is -500 purpose nitrogen-containing stainless steel powder and multi-component binder

[0025] The chemical composition of -500 mesh gas-atomized stainless steel powder is Cr 17.0%, Mn 11.3%, Mo 2.30%, N 0.42%, C 0.018%, Si 0.5%, P+S 0.020%, and trace impurity elements, and the balance is Fe; binder paraffin wax (PW), high-density polyethylene (HDPE), stearic acid (SA) three polymer mass ratio determined as PW: HDPE: SA = 68:29:3.

[0026] The binder and the raw material powder are mixed on a double-roll rubber mixer according to the volume fraction of 65% of the loading, the mixing temperature is 140 ° C, and the time is 90 minutes to ensure uniform mixing, and then crushed into injection feed, and then The molded blank is obtained by injection on the feeding injection machine, the injection temperature (at the nozzle) is 165° C., and the injection pressure is 100 MPa. The injection blank has a smooth surface and no internal defects. The i...

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Abstract

The invention provides a nitrogenous nickel-free stainless steel and a powder-metallurgical molding technology, relating to the field of stainless steel production. Nitrogenous stainless steel powder and a prepared cementing agent are mixed evenly in a mixing machine and then crashed to injection molding feedstock; injection molding blanks with smooth surfaces and without macro defects are obtained by an injection molder under appropriate injection temperature and injection pressure; after degreasing by chlorylene solvent, thermal degreasing and presintering are carried out to the injection molding blanks, thermal degreasing blanks with certain strength and without defects are obtained; the thermal degreasing blanks are sintered and densified in nitrogen based atmosphere, therefore, products with higher density and more excellent performance can be obtained. The nitrogenous nickel-free stainless steel of the invention can solve the problems that resource price of the nickel-contained stainless steel is expensive and the contained nickel thereof is harmful to human health and the like, extends the application scope of nitrogenous austenitic stainless steel. The materials prepared by using the nitrogenous nickel-free stainless steel of the invention are better than traditionally smelted austenitic stainless steel in terms of performance and the nitrogenous nickel-free stainless steel of the invention is resource saving and environmentally friendly.

Description

technical field [0001] The invention relates to the field of stainless steel production, in particular to a nitrogen-containing nickel-free stainless steel and a powder metallurgy preparation process thereof. Background technique [0002] The nickel-chromium austenitic stainless steel widely used at present has the following main problems: (1) the hardness is low, phase transformation strengthening cannot be carried out, and the wear resistance is poor; (2) the rapid growth of stainless steel output and the unreasonable variety structure, This has led to a serious shortage of nickel resources, rising prices, and increased cost pressures; (3) nickel-containing stainless steel as human implants and various devices that directly contact the human body will produce a "nickel-sensitivity" effect, which will cause damage to human health. These unfavorable factors limit the application of nickel-containing stainless steel. Therefore, the study of replacing nickel with other elemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38B22F3/10
Inventor 贾成厂徐自伟王栋梁况春江
Owner UNIV OF SCI & TECH BEIJING
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