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CN-121992306-A - Copper-containing martensitic antibacterial stainless steel and manufacturing method thereof

CN121992306ACN 121992306 ACN121992306 ACN 121992306ACN-121992306-A

Abstract

The invention discloses a martensitic antibacterial stainless steel and a preparation method thereof, wherein the martensitic antibacterial stainless steel comprises the following components ,C 0.3-0.5%;Si≤0.5%;Mn≤0.5%;P≤0.04%;S≤0.01%;Cr 13.0-15.0%;Mo≤1.0%;V≤0.2%;Al 0.2-0.4%;N 0.1-0.2%;Cu 3.0-5.0%; in percentage by weight, the elements satisfy the following quantitative relation that (Cr+3.3xMo)/Cu is less than or equal to 4.0, and the balance is iron and trace impurities which are inevitably introduced in the production process. The martensitic antibacterial stainless steel prepared by the formula and the process has the following performance characteristics of Hardness (HRC) 62, antibacterial rate 99.9%, corrosion resistance 70mv and no defect on the hot-rolled processing surface.

Inventors

  • JIA NAN
  • QIN BIN
  • YAO YUTING

Assignees

  • 浙江吉森金属科技有限公司

Dates

Publication Date
20260508
Application Date
20251219

Claims (10)

  1. 1. A martensitic antibacterial stainless steel is characterized by comprising the following components in percentage by weight, C 0.3-0.5%; Si≤0.5%; Mn≤0.5%; P≤0.04%; S≤0.01%; Cr 13.0-15.0%; Mo≤1.0%; V≤0.2%; Al 0.2-0.4%; N 0.1-0.2%; Cu 3.0-5.0%; And the elements satisfy the following quantitative relation (Cr+3.3xMo)/Cu is less than or equal to 4.0; The balance of iron and trace impurities which are inevitably introduced in the production process.
  2. 2. The martensitic antimicrobial stainless steel according to claim 1, wherein the trace impurities are derived from the environmental contact of the raw material in the process of smelting and processing, the total content of the trace impurities is less than or equal to 0.1%, and the content of single impurity elements is less than or equal to 0.01%.
  3. 3. The martensitic, antibacterial stainless steel according to claim 1, wherein the quantitative relation of 3.0≤Cr+3.3xMo)/Cu≤4.0 is satisfied.
  4. 4. The martensitic, antibacterial stainless steel according to claim 1, wherein the content of the Al component satisfies the following quantitative relationship of 0.25% or less and 0.35% or less.
  5. 5. A process for preparing the martensitic, antimicrobial stainless steel of any one of claims 1-4, comprising the steps of: s1, steelmaking and casting; S2, hot rolling; S3, an antibacterial heat treatment process; S4, quenching treatment process.
  6. 6. The method for processing martensitic, antibacterial stainless steel according to claim 4, wherein the steps S1 and S2 are as follows in detail: s1, steelmaking and casting: Steelmaking by adopting an electric furnace-an AOD furnace-an LF furnace according to the chemical components, continuously casting into billets, protecting molten steel by adopting argon during continuous casting, slowly cooling the billets to normal temperature, and grinding the surfaces of the billets; s2, hot rolling: The alloy heating temperature is 1150-1200 ℃, the heat preservation time is more than 2 hours, the initial hot rolling temperature is 1150-1200 ℃, the reduction of each pass is less than 30%, the final rolling temperature is 900-950 ℃, the water cooling is fast, and the coiling temperature is 600-700 ℃.
  7. 7. The method for processing martensitic, antibacterial stainless steel according to claim 4, wherein the steps S3 and S4 are as follows in detail: s3, an antibacterial heat treatment process: The method can adopt a hood-type annealing furnace, the argon is used for protecting, the alloy is slowly heated, the temperature is 750-800 ℃, the heat preservation time is more than 6 hours, the average size of an antibacterial phase is 5-10 mu m, the excellent antibacterial performance is ensured, the alloy is slowly cooled to normal temperature, and the alloy can be subjected to pickling, cold rolling and annealing after heat treatment; S4, quenching treatment process: And adopting a continuous annealing furnace, wherein the quenching temperature is 1050-1100 ℃, the heat preservation time is 4-6 minutes, the antibacterial performance is ensured not to be lost, and then, the steel is pickled, cleaned and dried.
  8. 8. The method of working a martensitic, antimicrobial stainless steel according to claim 4, wherein the surface of the blank is peeled prior to hot rolling to a thickness of about 1-3mm.
  9. 9. The method for producing a martensitic, antibacterial stainless steel according to claim 4, wherein the hot rolling is performed by using water-soluble rolling oil having a concentration of 6 to 8%.
  10. 10. The method for producing a martensitic, antibacterial stainless steel according to claim 4, wherein the alloy is subjected to an acid pickling pretreatment after quenching, and is rinsed with cold water and dried after pickling for 4-6 minutes at a temperature of 50-60 ℃ with a volume ratio of 1:3 of nitric acid to water.

Description

Copper-containing martensitic antibacterial stainless steel and manufacturing method thereof Technical Field The invention relates to the technical field of stainless steel materials, in particular to copper-containing martensitic antibacterial stainless steel and a manufacturing method thereof. Background With the continuous improvement of the living standard of people, people pay attention to health and hygiene problems. Various viruses are abused worldwide, and cause great harm to life health and economic development of people. These events have prompted the growing demand for antimicrobial products, which has also prompted the development and use of antimicrobial stainless steel. The antibacterial stainless steel is prepared by adding metal elements (such as copper, silver and the like) with antibacterial effect into conventional stainless steel, and performing special heat treatment processing to finally produce alloy with good antibacterial performance. The antibacterial stainless steel has excellent broad-spectrum antibacterial performance, good mechanical property and corrosion resistance, and wide application prospect. The copper-containing antibacterial stainless steel has lower cost and is easier to popularize in the market. The prior art discloses: CN101323930a discloses an antibacterial martensitic stainless steel and its application in hardware industry, and an antibacterial martensitic stainless steel and its application in hardware industry. Studies have been made on stainless steel metal materials, on the use of the antibacterial properties of copper, on how to add copper to stainless steel metal materials, and so on. Proper amount of copper is added into martensitic stainless steel, and special heat treatment (high temperature tempering is adopted to obtain a better tissue structure, so that the material has higher strength, good toughness, corrosion resistance and better antibacterial property), epsilon-Cu phase is separated out of the stainless steel in a dispersed way, copper ions are dissolved out of water, and therefore, the martensitic stainless steel has excellent antibacterial property. The addition of copper can refine the stainless steel grains, has higher strength and hardness, reduces passivation interval, and slightly increases corrosion speed. The antibacterial effect of the antibacterial martensitic stainless steel on staphylococcus aureus is more than 99%, and the antibacterial effect on escherichia coli reaches 97%, so that the performance of the stainless steel metal material can be improved, and the breeding of bacteria can be effectively inhibited. The antibacterial martensitic stainless steel is mainly applied to hardware products. CN114000066a discloses an antibacterial antiviral copper-containing stainless steel, its preparation and application, the invention provides an antibacterial antiviral copper-containing stainless steel, its preparation method and application, the copper-containing stainless steel comprises a stainless steel matrix and copper-rich phases uniformly distributed in the stainless steel matrix, wherein the copper content of the copper-containing stainless steel is 6-30wt%. The preparation method comprises a powder metallurgy method or a casting technology with optimized or copper embrittlement free problems. Compared with the traditional copper-containing antibacterial stainless steel, the copper-containing stainless steel product contains enough copper-rich precipitated phase, so that not only can the good killing effect on bacteria be realized, but also the capability of killing viruses comparable to that of pure copper can be achieved, and the copper-containing antibacterial stainless steel can be used for preparing the whole or all of the parts such as cutters, elevator buttons, handrails, door handles, cups and the like, and can effectively kill bacteria and viruses existing on the surfaces of the copper-containing antibacterial stainless steel. In a brief summary of the foregoing, a method of manufacturing a semiconductor device, The copper content range of the traditional copper-containing martensitic antibacterial stainless steel is wider, basically in the range of 1-5%, excellent antibacterial performance cannot be obtained when the copper content is lower, but when the copper content is higher, the hot processing performance of the alloy can be obviously reduced, defects such as surface cracks and the like are generated, the hot processing yield is reduced, the surface quality is influenced, and the production cost is increased. For this reason, it is necessary to add some beneficial elements to improve the hot workability of the alloy. In order to solve the problems in the prior art, it is desirable to provide a copper-containing martensitic antimicrobial stainless steel and a method for manufacturing the same. The copper-containing martensitic antibacterial stainless steel ensures that the alloy has excellent and durable antibacterial