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Medical high-nitrogen nickel-free austenitic stainless steel material and preparation method

A stainless steel and austenitic technology, applied in the field of medical high nitrogen nickel-free austenitic stainless steel materials and preparation, can solve the problems of undiscussed cytotoxicity and short development time, and achieve good cytotoxicity and pyrogenicity determination performance , excellent mechanical properties, high strength effect

Active Publication Date: 2016-11-16
CHONGQING MATERIALS RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, high-nitrogen nickel-free biomedical stainless steel has not been developed in China for a long time, and its types are under development. In recent years, many domestic scientific research institutes are also researching and developing new biomedical high-nitrogen stainless steel, in terms of composition ratio and preparation method It is still in the development stage, and the current medical austenitic stainless steel has not discussed and involves the issue of cytotoxicity

Method used

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  • Medical high-nitrogen nickel-free austenitic stainless steel material and preparation method

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Effect test

Embodiment 1

[0029] See Table 1 for the weight percentage of each component of the medical high-nitrogen nickel-free stainless steel material.

[0030] Table 1 Chemical composition of medical high-nitrogen nickel-free stainless steel materials (the following are mass percentages)

[0031] serial number

Embodiment 2

[0033] Get the ingredient formula of Example 1, and obtain the medical high-nitrogen nickel-free stainless steel material of the present invention by the following method.

[0034] The medical high-nitrogen nickel-free stainless steel of the present invention is smelted in a vacuum induction furnace and refined in an electroslag furnace, and processed into stainless steel in different product forms through forging, rolling, drawing and other processes. The processing and heat treatment processes are as follows:

[0035] Melting: Vacuum induction smelting and electroslag furnace remelting and refining are adopted. During vacuum induction smelting, the refining temperature is 1450-1500°C. During the refining process, the pressure of nitrogen protection is kept at 0.25-0.35MPa, and the pouring temperature is 1420-1440°C. Vacuum ingots are refined by electroslag remelting; homogenization treatment: heat treatment at 1050-1120°C for 4-6 hours, and then forging billets; forging: forg...

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Abstract

The invention relates to a medical high-nitrogen nickel-free austenitic stainless steel material and a production method thereof. The material is a single-phase austenite structure and comprises the following components by weight percent: 15-18% of Cr, 10-16% of Mn, 1.5-2.5% of Mo, 0.4-0.7% of N, 0.02-0.08% of RE, less than or equal to 0.06% of unavoidable impurities and the balance of Fe. The material is free of toxic nickel, has good cytotoxicity and pyrogenic testing performances, excellent mechanical performance, higher abrasion resistance and good corrosion resistance, especially spot corrosion resistance and intergranular corrosion resistance.

Description

technical field [0001] The invention relates to a medical stainless steel material, in particular to a medical high-nitrogen nickel-free austenitic stainless steel material and a preparation method thereof. Background technique [0002] Medical stainless steel is the most widely used material in medical biomaterials, but because it contains toxic nickel elements, it has a greater impact on the organisms using this type of material. For example, currently clinically used medical stainless steel 316L contains 12% to 15% nickel by mass, and 317L contains 11% to 15% nickel. Nickel may inhibit the phagocytosis and bactericidal effect of macrophages in the body, and can destroy intracellular organelles. , to change the cell state and reduce the number of cells. When nickel ions are in high concentrations, they can induce toxic effects, lead to cell destruction and inflammation, and are teratogenic and carcinogenic to organisms. The most common damage to humans caused by nickel a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C33/04C21D8/00A61L27/04
Inventor 邹兴政王宏李方张十庆郭卫民唐锐赵安中王东哲
Owner CHONGQING MATERIALS RES INST
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