Medical high-nitrogen nickel-free austenitic stainless steel and preparing method thereof

An austenitic stainless steel and austenitic technology, which is applied in the field of medical stainless steel material preparation, can solve the problems of human health hazards, high nickel price, singleness, etc., and achieve the effects of being beneficial to growth, saving resources and solving allergic reactions.

Inactive Publication Date: 2017-07-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a medical high-nitrogen nickel-free austenitic stainless steel, in particular to a medical implant medical high-nitrogen nickel-free austenitic stainless steel replacing compact bone tissue and its preparation method, to solve the problem of nickel-containing stainless steel. Due to the high price of nickel and the harm of medical nickel-containing stainless steel to human health, a single austenite structure has been obtained, which is a resource-saving nickel-free stainless steel material with high biomechanical compatibility and reduces process costs.

Method used

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  • Medical high-nitrogen nickel-free austenitic stainless steel and preparing method thereof
  • Medical high-nitrogen nickel-free austenitic stainless steel and preparing method thereof
  • Medical high-nitrogen nickel-free austenitic stainless steel and preparing method thereof

Examples

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Embodiment 1

[0037] A preparation method of medical high-nitrogen nickel-free austenitic stainless steel, comprising the steps of:

[0038] 1) Nitrogen-containing nickel-free duplex stainless steel powder X15CrMn with a particle size of -500 mesh and pore-forming agent NH 4 HCO 3 According to the mass fraction of 70:30, mix it in a V-type powder mixer for 24 hours until the powder is fully mixed and poured into the steel mold. The chemical composition of the nitrogen-containing nickel-free duplex stainless steel powder X15CrMn (wt.%) It is: Mn: 10.84, Cr: 17.5, Mo: 3.400, N: 0.44, Ni: 0.36, C: 0.059, O: 0.134, and the rest is Fe.

[0039] 2) Then press the mixed powder into a green body with a diameter of about 15 mm and a height of about 5 mm on a CMT5105 electronic universal testing machine 10 with a pressure of 200 MPa (see figure 1 ).

[0040] 3) if figure 2 As shown, the green body is placed in the tube furnace 3 for pre-sintering, the furnace tube is protected by flowing hydroge...

Embodiment 2

[0048] A method for preparing medical high-nitrogen nickel-free austenitic stainless steel, comprising the steps of:

[0049] 1) Nitrogen-containing nickel-free duplex stainless steel powder X15CrMn with a particle size of -500 mesh and pore-forming agent NH 4 HCO 3 According to the mass fraction of 50:50, mix it in a V-type powder mixer for 12 hours until the powder is fully mixed and poured into the steel mold. The chemical composition of the nitrogen-containing nickel-free duplex stainless steel powder X15CrMn (wt.%) It is: Mn: 10.84, Cr: 17.5, Mo: 3.400, N: 0.44, Ni: 0.36, C: 0.059, O: 0.134, and the rest is Fe.

[0050] 2) Then press the mixed powder into a green body with a diameter of about 15 mm and a height of about 5 mm on a CMT5105 electronic universal testing machine with a pressure of 374 MPa.

[0051] 3) Place the green body in a tube furnace for pre-sintering, flow hydrogen protection through the furnace tube, the gas flow rate is 300ml / min, and then o C / min ...

Embodiment 3

[0057] A preparation method of medical high-nitrogen nickel-free austenitic stainless steel, comprising the steps of:

[0058] 1) Nitrogen-containing nickel-free duplex stainless steel powder X15CrMn with a particle size of -600 mesh and pore-forming agent NH 4 HCO 3 According to the mass fraction of 70:30, mix in a V-type powder mixer for 48 hours until the powder is fully mixed and uniform, and the mixed powder is poured into a steel mold. The chemical composition of the nitrogen-containing nickel-free duplex stainless steel powder X15CrMn (wt.%) It is: Mn: 10.84, Cr: 17.5, Mo: 3.400, N: 0.44, Ni: 0.36, C: 0.059, O: 0.134, and the rest is Fe.

[0059] 2) Then press the mixed powder into a green body with a diameter of about 15 mm and a height of about 5 mm on a CMT5105 electronic universal testing machine 10 with a pressure of 500 MPa (see figure 1 ).

[0060] 3) Place the green body in a tube furnace for pre-sintering, the furnace tube is protected by flowing hydrogen ga...

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Abstract

The invention discloses medical high-nitrogen nickel-free austenitic stainless steel. The material is a single-phase austenite structure and includes, by weight percent, 13%-18% of Cr, 8%-12% of Mn, 2%-4% of Mo, 0.6%-2.5% of N, smaller than or equal to 0.36% of Ni and the balance iron and inevitable impurities, wherein smaller than or equal to 0.43% of the inevitable impurities exist. The invention further discloses a preparing method of the medical high-nitrogen nickel-free austenitic stainless steel. The medical high-nitrogen nickel-free austenitic stainless steel is very suitable for being used as medical implant materials, medical tool materials, jewelries and other stainless steel products, wherein the human body frequently makes contact with the stainless steel products; and in addition, the medical high-nitrogen nickel-free austenitic stainless steel can also be used for chemical engineering and environment friendliness aspects such as high-temperature liquid or gas solid particle filters, sewage treatment and fluid distribution devices and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of medical stainless steel materials, and in particular relates to a medical high-nitrogen nickel-free austenitic stainless steel based on high-temperature nitriding and a preparation method thereof. Background technique [0002] Stainless steel is the earliest medical metal material, which has been used clinically for more than half a century. In recent decades, due to the harm of nickel ions to the human body, many countries have banned nickel in medical materials, which has promoted the research and development of high-nitrogen nickel-free austenitic stainless steel, a new type of medical material. Nitrogen is an austenite-forming element. Nitrogen can strongly promote the formation of austenite, stabilize and expand the austenite phase region, and significantly improve the strength of austenitic stainless steel while maintaining its fracture toughness and improving resistance. corrosion p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/44C22C38/38C22C38/22C22C33/02B22F3/11C21D1/18
CPCC22C38/58B22F3/1134C21D1/18C21D2211/001C22C33/0285C22C38/001C22C38/22C22C38/38C22C38/44
Inventor 李烈军胡玲倪东惠彭政务彭翰林周峰熊超
Owner SOUTH CHINA UNIV OF TECH
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