TWI472628B - A method for manufacturing an antiseptic nitrogen-contained stainless steel - Google Patents

Description

Method for producing antibacterial nitrogen-containing stainless steel alloy

The present invention relates to a stainless steel alloy and a method of manufacturing the same, and more particularly to an antibacterial nitrogen-containing stainless steel alloy and a method of manufacturing the same.

At present, the known antibacterial products are classified into the following four types according to the manufacturing method: 1. surface coating antibacterial stainless steel 2. metal composite antibacterial stainless steel 3. surface modified antibacterial stainless steel 4. antibacterial stainless steel surface coating antibacterial stainless steel with antibacterial elements.

In the case of surface-coated antibacterial stainless steel, Japan Metal Industry Co., Ltd. has developed two kinds of photocatalytic painted stainless steel plates, one is an inorganic painted stainless steel plate, and the other is an organic painted stainless steel plate. The inorganic lacquered stainless steel plate is mainly sprayed and fixed on the surface of the stainless steel plate by spraying a cerium-based inorganic coating having a certain particle size of titanium oxide powder, and the coating thickness is about 2 to 4 μm. The organic/inorganic composite coating in which the titanium oxide powder is dispersed is applied to the surface of the stainless steel by a roll coating method. The manufacturing process of the organic painted stainless steel sheet is indistinguishable from the conventional painted stainless steel sheet, and the color is white, yellowish and Gray 3 basic colors, excellent antibacterial effect on E. coli and Staphylococcus aureus, but also anti-mildew effect. But these two products are not able to maintain their antibacterial effect for a long time.

In the case of metal composite antibacterial stainless steel, this market demand is mainly for the demand for antibacterial kitchen knives and scissors, etc., Japan Aichi Steel Co., Ltd. to solve the antibacterial requirements of steel materials in this respect, and Japanese deep sea metal In cooperation with a rolling mill that produces stainless steel and composite steel sheets for tools, we have developed a composite stainless steel sheet with excellent antibacterial properties. The composite tool has the following features: (1) The copper ion is partially eluted from the exposed copper layer to exert a strong antibacterial property. (2) The surface material is soft and easy to be compounded and ground. (3) The toughness of the composite steel plate is high. (4) The different colors exposed by the multi-layer composite structure have certain aesthetics. (5) The quenching hardness of the core material forming the knife edge portion is further improved due to the cooling effect of the copper layer. The disadvantage is that the addition of copper antibacterial stainless steel must undergo a heat treatment process, which also increases the manufacturing cost.

In the case of surface-modified antibacterial stainless steel, an antibacterial layer is formed on the surface of the stainless steel by means of sputtering, physical vapor deposition (PVD) or chemical vapor deposition (CVD). If the Cu-based preparation process is mainly infiltrated into the surface layer by a copper infiltrant, and obtained by an antibacterial heat treatment. Further, a target containing Ag or Cu may be used, and a thin layer containing Ag or Cu may be formed on the surface of the stainless steel by vacuum sputtering. At present, the Aichi Industrial Technology Center of Japan has developed a particle jet hardening method for the formation of an antibacterial layer, which is mainly used to ionize Cu or Ag particles and then sprayed onto the surface of the stainless steel by high pressure to form an antibacterial surface layer. However, the biggest drawback at present is that the size and size of the material are limited by the size of the manufacturing equipment, and the production can only be carried out in batches. It is still difficult to carry out continuous production.

In the case of antibacterial stainless steel with antibacterial elements, all the materials are developed to the final focus on the substrate. Regardless of the strength of the coating or coating, there is still a limitation on the service life, and the original material can be used as the antibacterial stainless steel. It is the best choice. Compared with other products and preparation methods, it has several advantages: 1. The longest antibacterial time; 2. The best antibacterial effect; 3. The possibility of peeling off the coating; 4. The stainless steel surface is not worn. Reduce antibacterial power; 5. Highly safe; 6. Can retain the characteristics of stainless steel itself.

In addition, the aforementioned conventional stainless steel alloy is usually added with a high proportion of nickel (Ni) in the material so that the stainless steel alloy has excellent resistance to uniform corrosion, fracture toughness and mechanical properties. However, the unit price of the nickel metal is relatively high, and the addition of nickel will cause an increase in the overall manufacturing cost of the stainless steel alloy, which is unfavorable for the sale of the product.

For the above reasons, it is necessary to further improve the above-mentioned conventional antibacterial nitrogen-containing stainless steel alloy and a method for producing the same.

The object of the present invention is to improve the above disadvantages to provide an antibacterial nitrogen-containing stainless steel alloy by adding a nitrogen component to a stainless steel alloy and reducing the amount of nickel to improve the corrosion resistance of the stainless steel alloy and to reduce the manufacturing cost.

A second object of the present invention is to provide an antibacterial nitrogen-containing stainless steel alloy by which a silver component is added to provide an antibacterial effect.

A second object of the present invention is to provide a method for producing an antibacterial nitrogen-containing stainless steel alloy for producing the aforementioned stainless steel alloy by means of atmospheric melting.

The antibacterial nitrogen-containing stainless steel alloy according to the present invention comprises: 1 to 10% by weight of manganese, 14 to 20% of chromium, 0.1 to 9% of nickel, 0.05 to 0.33% of nitrogen, and 0.05 to 0.5% of Silver, the remainder consists of iron and unavoidable impurities.

The method for producing an antibacterial nitrogen-containing stainless steel alloy according to the present invention comprises: melting a material of an iron-based alloy, ferromanganese, ferrochrome, silver, nitrogen, and nickel by atmospheric melting to melt-mix the materials; The melt-mixed material comprises 1 to 10% by weight of manganese, 14 to 20% of chromium, 0.1 to 9% of nickel, 0.05 to 0.33% of nitrogen, and 0.05 to 0.5% of silver, and the remainder It is composed of iron and unavoidable impurities, and maintains the ratio so that the melt-mixed material forms an antibacterial nitrogen-containing stainless steel alloy.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Referring to Fig. 1, the manufacturing method of the antibacterial nitrogen-containing stainless steel alloy of the present invention mainly comprises an atmospheric melting step S1 and an alloy producing step S2.

Referring to Fig. 1, the atmospheric melting step S1 of the present invention smelts an iron-based alloy, ferromanganese, ferrochrome, silver, nitrogen, and nickel by atmospheric melting to melt and mix the materials. More specifically, in the present embodiment, the iron-based alloy, ferromanganese, ferrochrome, silver, nitrogen, and nickel are placed in a high-temperature furnace [for example, a high-frequency furnace] to be melted in an atmosphere to be mixed. A specific ratio of molten alloy material. Wherein, the iron-based alloy used in the present embodiment contains 0.04% by weight of carbon, 0.80% of bismuth, 1.00% of manganese, 6.38% of nickel, 22.9% of chromium, and 0.90% of molybdenum, in addition to iron. 0.03% phosphorus and 0.01% sulfur, of course, the iron-based alloy can also be selected as a source of materials with different ratios. Among them, bismuth iron and copper may be additionally added to the materials to make the materials contain bismuth and copper components after smelting. Thus, in the present embodiment, the production of the antibacterial nitrogen-containing stainless steel alloy of the present invention is carried out by means of atmospheric melting, and therefore, it is possible to directly connect with the boiler operation of a large steel plant to realize the possibility of continuous production. In this way, it is different from the conventional vacuum smelting method, which is not conducive to continuous production. The invention can realize the process development of a large number of smelting manufacturing.

Referring to FIG. 1 again, the alloy preparation step S2 of the present invention comprises the melt-mixed material comprising 1 to 10% by weight of manganese, 14 to 20% of chromium, 0.1 to 9% by weight. Nickel, 0.05 to 0.33% of nitrogen and 0.05 to 0.5% of silver, the remainder consisting of iron and unavoidable impurities, and maintaining the ratio, so that the melt-mixed material can form an antibacterial nitrogen-containing stainless steel alloy. More specifically, when the foregoing material is added to a high temperature furnace to form a molten alloy material, the weight composition ratio of the molten alloy in the furnace is then sampled to determine the composition weight percentage of the molten mixed alloy material is maintained at: 1 to 10 % manganese, 14-20% chromium, 0.1-9% nickel, 0.05-0.33% nitrogen and 0.05-0.5% silver, the remainder is iron and unavoidable impurities. Among them, since the composition of nickel is used to improve the corrosion resistance of the alloy, the price of nickel is relatively expensive. Therefore, in this embodiment, by reducing the specific gravity of nickel and adding nitrogen into the alloy, the composition of the nitrogen element is transmitted. The corrosion resistance of the alloy is provided; in addition, a silver component is added to the molten alloy to impart an antibacterial effect to the alloy. Wherein, the alloy material further contains a part of impurities, such as carbon (C), sulfur (S), phosphorus (P), cerium (Si) or copper (Cu), and the carbon is preferably lower than the weight percentage. 0.09%, sulfur is preferably less than 0.04%, phosphorus is preferably less than 0.04%, and lanthanum is preferably less than 0.65%. Thus, the alloy after the melt mixing is maintained at the above composition ratio, and the antibacterial nitrogen-containing stainless steel alloy of the present invention is obtained after being cooled and solidified.

Further, the aforementioned stainless steel alloy is preferably protected by liquid argon gas during the smelting process to prevent oxidation of the surface of the molten alloy due to contact with the atmosphere.

In summary, through the foregoing process, the antibacterial nitrogen-containing stainless steel alloy of the present invention can be obtained, which mainly comprises 1 to 10% by weight of manganese, 14 to 20% of chromium, and 0.1 to 9% of nickel. 0.05 to 0.33% nitrogen and 0.05 to 0.5% silver, the remainder consisting of iron and unavoidable impurities. Among them, the composition of nitrogen (N) element can expand the temperature range in which the iron phase of Vostian is stable, which promotes the formation of the iron phase of Vostian during the cooling process, so that the corrosion resistance and mechanical properties of the alloy are not greatly affected by welding. Destruction, and can improve the tensile strength, pitting corrosion resistance and crevice corrosion resistance of low-nickel stainless steel, so that low-nickel stainless steel can be widely used in people's livelihood, medical equipment and 3C industries. In addition, the present invention further adds silver particles to the alloy, so that the nitrogen-containing low-nickel stainless steel has antibacterial ability and further increases the added value of the nitrogen-containing low-nickel stainless steel. Thereby, the stainless steel alloy of the present invention has the advantages of excellent antibacterial property, good corrosion resistance and low cost.

Please refer to Table 1, which is a comparison table of the embodiments of the different ratios of the present invention.

In summary, the antibacterial nitrogen-containing stainless steel alloy of the present invention reduces the specific gravity of nickel and adds nitrogen to make the alloy have good corrosion resistance.

The antibacterial nitrogen-containing stainless steel alloy of the present invention is characterized in that silver is added to the above-mentioned nitrogen-containing stainless steel alloy to impart an antibacterial effect to the stainless steel alloy.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

S1‧‧‧ atmospheric melting step

S2‧‧‧ alloy production steps

Fig. 1 is a flow chart showing a method of producing an antibacterial nitrogen-containing stainless steel alloy of the present invention.

S1‧‧‧ atmospheric melting step

S2‧‧‧ alloy production steps

Claims (3)

A method for producing an antibacterial nitrogen-containing stainless steel alloy, comprising: melting a material of an iron-based alloy, ferromanganese, ferrochrome, silver, nitrogen and nickel by atmospheric melting to melt-mix the materials; and melting the mixture The latter material contains 1% to 10% manganese, 14% to 20% chromium, 0.1% to 9% nickel, 0.05% to 0.33% nitrogen, and 0.05% to 0.5% silver, with the remainder being iron and not The impurities are avoided and the ratio is maintained such that the melt-mixed material forms an antibacterial nitrogen-containing stainless steel alloy. The method for producing an antibacterial nitrogen-containing stainless steel alloy according to claim 1, wherein in the atmospheric melting step, ferroniobium and copper are additionally added, and the melt-mixed material is additionally included in the alloy preparation step. There are less than 0.09 carbon, less than 0.65% bismuth, less than 0.04% phosphorus, less than 0.04% sulphur, and less than 2.5% copper by weight percent. The method for producing an antibacterial nitrogen-containing stainless steel alloy according to claim 1, wherein in the atmospheric melting step and the alloy producing step, the melt-mixed materials are further protected by a liquid argon gas.