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Martensitic antibacterial stainless steel and its heat treatment method and application

A technology of antibacterial stainless steel and heat treatment method, applied in the field of martensitic antibacterial stainless steel, can solve the problems of reducing the strength and hardness of martensitic stainless steel, increasing the process flow and complexity, unfavorable large-scale production, etc., achieving excellent corrosion resistance, Effects of enhanced application value, excellent strength and antimicrobial properties

Active Publication Date: 2019-07-16
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the temperature of martensitic antibacterial stainless steel during aging treatment is high (about 500-800 ° C), which will reduce the strength and hardness of martensitic stainless steel, greatly affecting its application value
In order to improve this problem, the industry usually performs a short-term solution quenching treatment (such as CN102330022A) after martensitic antibacterial stainless steel is subjected to aging treatment, but this increases the process flow and complexity, which is not conducive to large-scale production

Method used

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  • Martensitic antibacterial stainless steel and its heat treatment method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A kind of martensitic antibacterial stainless steel, by weight percentage, the chemical composition of described stainless steel is as follows:

[0046] C: 0.9%; Cr: 17.0%; Mo: 1.0%; V: 0.4%; Cu: 3.0%; Si: ≤1%; Mn: ≤1%; S: ≤0.01%; P: ≤0.01%; The amount is Fe.

[0047] The above-mentioned martensitic antibacterial stainless steel is forged into rods at 1120° C. after vacuum induction smelting. The heat treatment process of martensitic antibacterial stainless steel after smelting is:

[0048] First perform solution treatment at a solution temperature of 970°C for 30 minutes, and then cool it to room temperature with oil; then perform aging treatment at 250°C, keep it warm for 1 hour, and cool it with oil to room temperature to obtain a martensitic antibacterial stainless steel after heat treatment .

Embodiment 2

[0064] A kind of martensitic antibacterial stainless steel, by weight percentage, the chemical composition of described stainless steel is as follows:

[0065] C: 0.8%; Cr: 16.0%; Mo: 1.05%; V: 0.3%; Cu: 2.5%; Si: ≤1%; Mn: ≤1%; S: ≤0.01%; P: ≤0.01%; The amount is Fe.

[0066] The above-mentioned martensitic antibacterial stainless steel is cast at 1455° C. after vacuum induction smelting. The heat treatment process of the above-mentioned martensitic antibacterial stainless steel after smelting is:

[0067] First perform solution treatment at a solution temperature of 940°C for 40 minutes, and then cool it to room temperature with oil; then perform aging treatment at 200°C, keep it warm for 2 hours, and cool it to room temperature with oil to obtain heat-treated martensitic antibacterial stainless steel .

[0068] In Example 2, the bactericidal rate of martensitic antibacterial stainless steel after heat treatment to Escherichia coli was 99.99%, and the bactericidal rate to ...

Embodiment 3

[0070] A kind of martensitic antibacterial stainless steel, by weight percentage, the chemical composition of described stainless steel is as follows:

[0071] C: 1.0%; Cr: 18.0%; Mo: 0.95%; V: 0.5%; Cu: 3.5%; Si: ≤1%; Mn: ≤1%; S: ≤0.01%; P: ≤0.01%; The amount is Fe.

[0072] The above-mentioned martensitic antibacterial stainless steel is cast at 1460° C. after vacuum induction smelting. The heat treatment process of martensitic antibacterial stainless steel after smelting is:

[0073] First, solution treatment was carried out at a solution temperature of 960°C for 20 minutes, and air-cooled to room temperature; then, aging treatment was carried out at 300°C, kept for 1.5 hours, and air-cooled to room temperature to obtain heat-treated martensitic antibacterial stainless steel.

[0074] In Example 3, the heat-treated martensitic antibacterial stainless steel has a bactericidal rate of 99.99% for Escherichia coli and 99.99% for Staphylococcus aureus; its Rockwell hardness is...

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Abstract

The invention provides a martensitic antibacterial stainless steel and its preparation method and application. Its chemical composition is as follows by weight percentage: C: 0.8‑1.0%; Si: ≤0.01%; Mn: ≤0.01%; S: ≤ 0.01%; P: ≤0.01%; Cr: 16.0‑18.0%; Mo: 0.95‑1.05%; V: 0.3‑0.5%; Cu: 2.5‑3.5%; the balance is Fe. Its heat treatment method is to carry out solid solution treatment for 20-60min first, oil cooling or air cooling to room temperature; wherein, the solid solution temperature is higher than its Ac3 critical temperature 20-50°C; then aging treatment is carried out at 200-300°C for 1- After 2 hours, oil cooling or air cooling to room temperature, after being treated by the method of the present invention, the obtained martensitic antibacterial stainless steel can have both excellent mechanical properties, strong antibacterial properties and corrosion resistance, and can be applied to various fields.

Description

technical field [0001] The invention relates to the technical field of martensitic antibacterial stainless steel, in particular to a martensitic antibacterial stainless steel and its heat treatment method and application. Background technique [0002] Antibacterial stainless steel refers to a new stainless steel material with antibacterial function. It generally adds an appropriate amount of metal elements (such as copper, etc.) with bactericidal effect to the existing stainless steel matrix. New functional materials with high performance and antibacterial properties. Among the existing copper-containing antibacterial stainless steels, there are mainly austenitic, ferritic, and martensitic antibacterial stainless steels. Among them, martensitic stainless steel is widely used in mechanical fields such as knives due to its high hardness. [0003] At present, the heat treatment process of martensitic antibacterial stainless steel generally includes solution treatment and aging...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22C22C38/24C22C38/20C22C38/02C22C38/04C21D6/00
CPCC21D6/002C21D2211/008C22C38/02C22C38/04C22C38/20C22C38/22C22C38/24
Inventor 潘浩波梁涛杨柯赵颖
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI