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Precipitation-hardening martensitic stainless steel for surgical operation and heat treatment process thereof

A martensitic stainless steel, precipitation hardening technology, applied in the field of stainless steel materials, can solve problems such as bacterial infection, and achieve the effect of strong antibacterial performance, excellent mechanical properties and corrosion resistance

Active Publication Date: 2014-06-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a precipitation hardening martensitic stainless steel with antibacterial function for surgery and its heat treatment process, so as to solve the problem of bacterial infection caused by medical instruments in the existing surgery

Method used

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  • Precipitation-hardening martensitic stainless steel for surgical operation and heat treatment process thereof
  • Precipitation-hardening martensitic stainless steel for surgical operation and heat treatment process thereof
  • Precipitation-hardening martensitic stainless steel for surgical operation and heat treatment process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Calculate the bactericidal rate of precipitation hardened martensitic antibacterial stainless steel and control samples (ordinary stainless steel or other solid materials without bactericidal ability) to common infectious bacteria (Escherichia coli, Staphylococcus aureus, etc.) according to the following formula:

[0022] Bactericidal rate (%)=[(number of viable bacteria in control sample-number of viable bacteria in antibacterial stainless steel) / number of viable bacteria in control sample]×100 where the number of viable bacteria in control sample refers to the number of viable bacteria after bacterial culture on the control sample The number of live bacteria in antibacterial stainless steel refers to the number of live bacteria after bacterial culture on precipitation hardening martensitic antibacterial stainless steel.

[0023] In this embodiment, the chemical composition of the precipitation hardening martensitic antibacterial stainless steel is (% by weight):

[00...

Embodiment 2

[0031] In this embodiment, the chemical composition of the precipitation hardening martensitic antibacterial stainless steel is (% by weight):

[0032] C: 0.03%, Cr: 15.90%, Ni: 3.55%, Nb: 0.22%, Cu: 4.8%, N: 0.08%, and the rest is Fe.

[0033] The heat treatment process of above-mentioned precipitation hardening martensitic antibacterial stainless steel is:

[0034] Insulate at 1050°C for 1 hour, and cool to room temperature with water to make the copper in the steel in a supersaturated state; then keep it at minus 70°C for 0.5 hours to completely transform the retained austenite into martensite in the steel; finally, at 480°C, Heat at 550°C, 580°C and 620°C for 10 hours to precipitate a sufficient volume fraction of copper-rich phase in the steel, then air-cool or water-cool to room temperature.

[0035] The mechanical properties of the precipitation hardened martensitic antibacterial stainless steel after these four aging temperature treatments are as follows: figure 2 s...

Embodiment 3

[0038] In this embodiment, the chemical composition of the precipitation hardening martensitic antibacterial stainless steel is (% by weight):

[0039] C: 0.02%, Cr: 16.10%, Ni: 3.47%, Nb: 0.26%, Cu: 5.2%, N: 0.12%, and the rest is Fe.

[0040] The heat treatment process of above-mentioned precipitation hardening martensitic antibacterial stainless steel is:

[0041] Insulate at 1050°C for 1 hour, and cool to room temperature with water to make the copper in the steel in a supersaturated state; then keep at -70°C for 0.5 hours to completely transform the retained austenite into martensite in the steel; finally hold at 620°C for 10 hours , to precipitate the copper-rich phase in the steel, air-cooled or water-cooled to room temperature.

[0042]Using conventional electrochemical three-electrode system method to test the polarization curve of the above stainless steel on PRINCETON273A electrochemical comprehensive analyzer and SOLATRON1287 potentiostat, the reference electrode ...

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Abstract

The invention discloses precipitation-hardening martensitic stainless steel for a surgical operation and a heat treatment process thereof, and belongs to the technical field of stainless steel material. The stainless steel comprises the following chemical composition: not more than 0.07 wt% of C, not more than 1.00 wt% of Si, not more than 1.00 wt% of Mn, not more than 0.040 wt% of P, not more than 0.030 wt% of S, 3.00-5.00 wt% of Ni, 15.0-17.5 wt% of Cr, 3.5-5.5 wt% of Cu, 0.05-0.15 wt% of N, 0.15-0.45 wt% of Nb, and the balance Fe. After the stainless steel is subjected to special heat treatment, a copper-rich phase can be precipitated evenly and dispersedly in a stainless steel matrix, and thus the stainless steel is endowed with an antibacterial function. The stainless steel solves the problem of bacterial infection caused by the use of stainless steel tools in a conventional surgical operation, is widely applied in various stainless steel appliances such as scalpels, surgical scissors, surgical forceps, intestinal forceps and curettes used in the surgical operation in the medical clinical field.

Description

technical field [0001] The invention relates to the field of stainless steel materials, in particular to a precipitation hardening martensitic stainless steel for surgery and a heat treatment process thereof. The stainless steel has a unique antibacterial function, and has good mechanical properties and corrosion resistance, and can be widely used in various stainless steel instruments used in surgical operations in the medical clinical field. Background technique [0002] Surgical instruments are usually made of stainless steel, and martensitic stainless steel has an obvious advantage in the selection of surgical instrument materials due to its excellent strength and toughness. Precipitation-hardening martensitic stainless steel has been widely used because of its good mechanical properties, such as surgical knives (surgical blades, skin blades, razors, pedicures), surgical scissors (surgical scissors, tissue scissors, dissecting scissors) ), surgical forceps (hemostatic f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C21D6/00C21D6/04
Inventor 杨春光王帅任玲南黎卢志江杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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