CN105821299A - High-corrosion-resistance antibacterial ferrite stainless steel and manufacturing method thereof - Google Patents
High-corrosion-resistance antibacterial ferrite stainless steel and manufacturing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention discloses a high-corrosion-resistance antibacterial ferrite stainless steel and a manufacturing method thereof. The high-corrosion-resistance antibacterial ferrite stainless steel comprises, by weight, less than 0.015% of C, 0.1%-0.5% of Si, 0.1%-0.5% of Mn, less than 0.035% of P, less than 0.010% of S, 18%-22% of Cr, 0.5%-1.0% of Mo, 1.5%-2.5% of Cu, 0.015%-0.020% of N, no less than 8*(C+N) and less than 0.5% of Ti, and the balance Fe and inevitable impurities. The high-corrosion-resistance antibacterial ferrite stainless steel is smelted through a three-step method of electric-arc furnace+ AOD+ VOD, and a continuously cast blank is obtained after continuous casting; a cold-rolled stainless steel strip with good corrosion resistance and antibacterial performance is obtained after hot rolling, high-temperature direct quenching, strip steel hot rolling, annealing, acid pickling, cold rolling, annealing, acid pickling and other processes, and the pitting potential of the stainless steel is 0.25-0.35 V.
Description
Technical field
The present invention relates to rustless steel and manufacture method thereof, be specifically related to a kind of antibacterial ferritic stainless steel of high corrosion-resistant and manufacture method thereof, this ferritic stainless steel not only has antibiotic property, and has good corrosion resistance.
Background technology
Antibacterial ferritic stainless steel has good machinability and anti-microbial property, is usually and adds the metallic element with antibacterial action in the fusion process of steel, forms antibacterial phase and make rustless steel entirety have antibiotic property in steel.Copper-bearing antibacterial rustless steel, its ultimate principle is the solid solubility variation with temperature utilizing copper in steel, carries out Ageing Treatment after solid solution, and the copper-rich phase of precipitation gives material antibacterial functions.
Existing commercial copper-bearing ferritic antibacterial stainless steel is usually on the basis of 430 ferritic stainless steels and adds 2%Cu, separates out the mesh ground of copper-rich phase on ferrite matrix by using the production technology identical with 430 ferritic stainless steels i.e. to may be implemented in.But, this 430 antibacterial carbons content of steel of class higher (generally C0.03～0.05%), there is substantial amounts of carbide and copper-rich phase on ferrite matrix, cause corrosion resistance to decline, it is difficult to meet the industry requirements corrosion proof to rustless steel such as kitchen guarding, household electrical appliances, medicine.
Super-purity ferrite stainless steel uses ultralow C, adds a certain amount of Cr and Mo and stabilizing element Nb and Ti, therefore, has good corrosion resistance.But owing to the addition of Nb and Ti alloying element, make the recrystallization annealing temperature of ferritic stainless steel improve to 900～1000 DEG C.For adding the super-purity ferrite stainless steel of copper, the copper-rich phase separated out by Ageing Treatment will be dissolved under the highest annealing temperature, causes anti-microbial property to disappear.Therefore, how to solve stabilisation super-purity ferrite stainless steel recrystallization annealing temperature and the coupling of copper-rich phase solution temperature, be the key developing the anti-bacteria stainless steel with high corrosion-resistant.
Summary of the invention
It is an object of the invention to provide a kind of antibacterial ferritic stainless steel of high corrosion-resistant and manufacture method thereof, while this ferritic stainless steel has good anti-microbial property, have higher decay resistance concurrently, wherein, some pitting position can reach 0.25～0.35V.
For reaching above-mentioned purpose, the present invention mainly adopts the following technical scheme that
A kind of antibacterial ferritic stainless steel of high corrosion-resistant, its chemical component weight percentage ratio is: C≤0.015%, Si:0.1～0.5%, Mn:0.1～0.5%, P≤0.035%, S≤0.010%, Cr:18～22%, Mo:0.5～1.0%, Cu:1.5～2.5%, N:0.015～0.020%, 8 (C+N)≤Ti≤0.5%, remaining is Fe and inevitable impurity.
Further, the microscopic structure of the antibacterial ferritic stainless steel of described high corrosion-resistant is ferrite matrix+copper-rich phase.
The point pitting position of the antibacterial ferritic stainless steel of high corrosion-resistant of the present invention is 0.25～0.35V.
In the composition of steel of the present invention designs:
Cu (copper): copper dissolubility in ferrite is the lowest, will be with Cu Rich Phase Precipitation after Ageing Treatment, and along with raising and the prolongation of aging time of aging temp, copper-rich phase granule is gradually grown up.The Cu that copper-rich phase produces with medium effect2+Ion and bacterial action, make antibacterial lose breeding and survival ability, thus play bactericidal action.Ferritic stainless steel copper content is the highest, and antibacterial effect is the most obvious, but too high copper content can cause hot-working surface checking.Therefore, the present invention controls Cu content is 1.5～2.5%.
Cr (chromium): chromium is to make rustless steel have ferritic structure and have the element of good corrosion resistance.In Oxidant is such as air, chromium and oxygen act on stainless steel surfaces and form the chromium oxide (Cr of densification2O3) passivating film.This layer of passivating film, under medium effect, still keeps stable passive state, stops harmful substance to the erosion of stainless steel base so that rustless steel has good corrosive nature.Chromium content is the highest, and decay resistance is the best.Too high chromium content can increase brittlement phase and separate out tendency, reduces manufacturability and the processing type of steel.By ensure the antibacterial ferritic stainless steel of exploitation there is good decay resistance and processing characteristics, it is 18～22% that the present invention controls Cr content.
Mo (molybdenum): molybdenum is ferrite former, is remarkably improved stainless resistance to spot corrosion and slit and corrosion resistant performance, also can improve stainless intensity.But too high molybdenum content can promote that brittlement phase separates out, and causes processing characteristics to deteriorate, and the most also can improve the Sensitivity of Stress Corrosion of ferritic stainless steel.Therefore, the present invention controls Mo content is 0.5～1.0%.
Ti (titanium): titanium is the maximally effective stabilizing element of ferritic stainless steel, nitrogen is the harmful element in steel, fixes the free carbon in steel, nitrogen-atoms by adding titanium, forms stable TiN and TiC, prevent the precipitation of chromium nitride and chromium carbide, thus improve intergranular corrosion resistance performance.According to TiN solubility product formula in ferritic stainless steel, controlled the Precipitation Temperature of TiN by adjustment Ti, N content, adjust size and the distribution of TiN, and then control ferritic stainless steel recrystallization temperature.The TiN of large-size does not hinder the recrystallization of ferritic stainless steel, thus does not improve ferrite recrystallization temperature；Tiny TiN hinders recrystallization, improves ferrite recrystallization temperature, when recrystallization temperature is sufficiently high, copper-rich phase can be caused to dissolve, and antibacterial effect disappears.By controlling the content of Ti, C, N, make the TiN of 1～2 μm separate out at solidification front, to ensure that the later stage does not separate out tiny TiN, recrystallization annealing temperature can be made to control within the temperature range not occurring copper-rich phase to dissolve.Therefore, the present invention controls N:0.015～0.020%, 0.5% >=Ti >=8 (C+N).
C (carbon): carbon, as interstitial element, is remarkably improved the intensity of ferritic stainless steel, improves ductile-brittle transition temperature, increases notch cracks sensitivity, reduces weld seam decay resistance；Carbon content is the lowest, and ferrite stainless Steel Properties is the best, but carbon is difficult to again remove completely in stainless steel smelting process.Considering to produce reality, application claims C content controls below 0.015%.
Si (silicon), Mn (manganese): silicon, manganese are the essential elements in steel, for improving purity of steel, need to add silicon, manganese element carries out deoxidation, to improve stainless toughness and surface quality.But too high silicon, Fe content can reduce stainless plasticity and toughness, deteriorate cold-forming property.The present invention controls Si≤0.5%, Mn≤0.5%.
P (phosphorus), S (sulfur): phosphorus, sulfur are impurity element in rustless steel, reduce corrosion resistance and the plasticity of steel.Phosphorus, sulfur also reduce stainless high-temp plastic, and then cause stainless steel continuous casting and hot rolling product quality problems, as internal fissure and limit are split, should reduce its content as far as possible.Considering to produce practical capacity, the present invention controls P≤0.035%, S≤0.010%.
The manufacture method of the antibacterial ferritic stainless steel of a kind of high corrosion-resistant of the present invention, it comprises the steps:
1) smelt
By following chemical composition through electric arc furnace smelting, its chemical component weight percentage ratio is: C≤0.015%, 0.1%≤Si≤0.5%, 0.1%≤Mn≤0.5%, P≤0.035%, S≤0.010%, Cr:18～22%, Mo:0.5～1.0%, Cu:1.5～2.5%, N:0.015～0.020%, 8 (C+N)≤Ti≤0.5%, remaining is Fe and inevitable impurity；
2) continuous casting
Molten steel after VOD stove processes is delivered to conticaster continuous casting and is obtained continuous casting billet, and continuous casting steel billet carries out hot repair mill process；
3) hot rolling+batch+cool down
Continuous casting billet is heated to 1150～1200 DEG C, carries out hot rolling, finishing temperature 850～900 DEG C after insulation 190～230min；Batching after Water-Curta in Cooling, coiling temperature is 600～650 DEG C, then water-cooled again；
4) hot-roll annealing+pickling
Hot-roll annealing temperature is 850～900 DEG C, and the hot-roll annealing time is 2～4h；
5) cold rolling+cold rolled annealed+pickling+smooth
Cold roling reduction is 60～80%, and cold rolled annealed temperature is 850～900 DEG C, and unit thickness annealing time is 1～1.5min/mm, smooth rear acquisition finished product ferritic stainless steel.
Further, step 1) smelt in first by blast-melted electric arc furnace of delivering to, add high-carbon Cr-Fe alloy and also heat, prepare to obtain mother liquor of stainless steel, deliver to AOD furnace decarburization, add ferro-molybdenum, deliver to VOD stove, after oxidized, reduction, vacuum decarburization, feed titanium silk and process.
In the present invention, copper-rich phase volume fraction is directly proportional to room point defect concentration, improves the vacancy concentration in steel and is conducive to the precipitation of copper-rich phase.And room point defect concentration is relevant with the hardening heat after high temperature deformation, hardening heat is the highest, and the vacancy concentration remaining into room temperature is the highest.Therefore, for promoting the precipitation of copper-rich phase, present invention employs high temperature direct quenching technique after hot rolling, finishing temperature control, at 850～900 DEG C, batches after Water-Curta in Cooling, then by coil of strip water-cooled, to improve the vacancy concentration in steel, improves Cu Rich Phase Precipitation nucleation rate.
The coil of strip that the present invention is directed to high-temperature final rolling quenching carries out Ageing Treatment at 850～900 DEG C, to promote the abundant precipitation of copper-rich phase.Being the dissolving avoiding copper-rich phase, the present invention controls cold rolled annealed temperature less than 900 DEG C simultaneously.
The beneficial effects of the present invention is:
1, the present invention is on the basis of antibacterial ferritic stainless steel, controls C≤0.015%, is designed by this ultralow C content, improves the intergranular corrosion resistance performance of antibacterial ferritic stainless steel；And form stable TiN and TiC by adding Ti, prevent causing owing to forming the carboritride of Cr Cr concentration to reduce thus cause corrosion resistance to decline.The point pitting position of steel of the present invention reaches 0.25～0.35V, has the ratio 430 class more preferable decay resistance of antibacterial steel, and meanwhile, sterilizing rate can reach more than 96.5%, has good anti-microbial property.
2, for adding the super-purity ferrite stainless steel of Cu, owing to the addition of Nb and Ti, substantially increasing the recrystallization annealing temperature of steel, cause the copper-rich phase separated out to dissolve at a temperature of higher recrystallization annealing, final anti-microbial property disappears.Without Nb in steel of the present invention, and control Ti >=8 (C+N), it is ensured that the recrystallization annealing temperature of ferritic stainless steel is less than the solution temperature of copper-rich phase, so that it is guaranteed that steel still has excellent anti-microbial property.
3, direct high temperature quenching technical after the present invention uses hot rolling, improves the vacancy concentration in steel, the beneficially disperse educt of copper-rich phase, is beneficial to obtain excellent anti-microbial property.
4, ferritic stainless steel of the present invention has good resistance to spot corrosion performance, intergranular corrosion resistance performance and good anti-microbial property, is a kind of ferrite type anti-biotic material having very much application prospect.
Accompanying drawing explanation
Fig. 1 is the precipitation pattern photo of copper-rich phase after the embodiment of the present invention 2 cover annealing.
Fig. 2 is the precipitation pattern photo of copper-rich phase after comparative example 1 cover annealing.
Fig. 3 is the embodiment of the present invention 2 electrochemical corrosion pattern photo.
Fig. 4 is comparative example 1 electrochemical corrosion pattern photo.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention will be further described.
Table 1 is the composition of embodiment of the present invention steel and comparative example steel, and table 2 is the key process parameter of embodiment of the present invention steel and comparative example steel, and table 3 is pitting potential experiment and the sterilizing rate experimental result of embodiment of the present invention steel.
The manufacturing process of the embodiment of the present invention is as follows:
1) smelt
By chemical composition listed in table 1 through electric arc furnace smelting, by blast-melted electric arc furnace of delivering to, adding high-carbon Cr-Fe alloy and heat, preparing to obtain mother liquor of stainless steel, described mother liquor of stainless steel temperature >=1670 DEG C, phosphorus content is 2.5～3.5%, delivers to AOD furnace and uses Ar, O2Decarburization, adds ferro-molybdenum, delivers to VOD stove, after oxidized, reduction, vacuum decarburization, feeds titanium silk and processes.
2) continuous casting
Molten steel after VOD stove processes is delivered to conticaster continuous casting and is obtained continuous casting billet, carries out electromagnetic agitation in casting process, and thickness of strand is 200mm, and continuous casting steel billet carries out hot repair mill process.
3) hot rolling+batch+cool down
Continuous casting billet is heated to 1150～1200 DEG C, carries out hot rolling, finishing temperature 850-900 DEG C after insulation 190～230min；Batching after Water-Curta in Cooling, coiling temperature is 600～650 DEG C again, batches water-cooled in rear discharge sump.
4) hot-roll annealing+pickling
Hot-roll annealing temperature 850～900 DEG C, use bell furnace to anneal, and hot-roll annealing temperature retention time 2～4h makes copper-rich phase fully separate out.Carry out pickling, TV value 100～200mm × m/min at continuous acid-washing unit, use neutral salt electrolysis, use the nitration mixture of nitric acid and Fluohydric acid. to carry out pickling.
5) cold rolling+cold rolled annealed+pickling+smooth
Cold roling reduction 60～80%, cold rolled annealed temperature 850～900 DEG C, annealing unit TV value 20～50mm × m/min, use the nitration mixture of nitric acid and Fluohydric acid. to carry out pickling, smooth rear acquisition finished product ferritic stainless steel, steel plate thickness 0.5～0.8mm.
The key process parameter of the embodiment of the present invention and comparative example sees table 2, and comparative example 1 is the conventional 430 antibacterial ferritic stainless steels of class.
Fig. 1, Fig. 2 give the tissue topography after embodiment 2 and comparative example 1 cover annealing.As seen from Figure 1, under present invention high temperature quenching technical after hot rolling, copper-rich phase separates out at ferrite intracrystalline and crystal boundary simultaneously；From Figure 2 it can be seen that Cu mainly separates out at crystal boundary under pair rolling technique.
Table 3 gives embodiment and the some pitting position of comparative example finished product and sterilizing rate test result, from table 3, the point pitting position of embodiment of the present invention 1-6 is apparently higher than comparative example 1-6, and the some pitting position of the present invention is 0.25～0.35V, reach 304 classes and the stainless level of 443 classes, the most also there is good anti-microbial property.
Fig. 3, Fig. 4 are embodiment 2 steel and the electrochemical corrosion pattern contrast under the conditions of equal electrochemical test of comparative example 1 steel.From Fig. 3-Fig. 4, under the conditions of equal electrochemical test, there is bigger point corrosion pit in comparative example 1, and embodiment 2 then has no obvious point corrosion pit, shows good corrosion resistance.Simultaneously from Fig. 3, Fig. 4, in embodiment 2, copper-rich phase content is significantly more than comparative example 1, it is shown that the superiority of high temperature quenching technical after hot rolling of the present invention.
As it has been described above, use the antibacterial ferritic stainless steel of the present invention to have good corrosion resistance, the shortcoming overcoming 430 class anti-bacteria stainless steel corrosion resistance differences, can significantly expand the application of antibacterial ferritic stainless steel.
Claims (7)
1. the antibacterial ferritic stainless steel of high corrosion-resistant, its chemical component weight percentage ratio is: C≤0.015%, Si:0.1～0.5%, Mn:0.1～0.5%, P≤0.035%, S≤0.010%, Cr:18～22%, Mo:0.5～1.0%, Cu:1.5～2.5%, N:0.015～0.020%, 8 (C+N)≤Ti≤0.5%, remaining is Fe and inevitable impurity.
The antibacterial ferritic stainless steel of high corrosion-resistant the most according to claim 1, it is characterised in that the microscopic structure of the antibacterial ferritic stainless steel of described high corrosion-resistant is ferrite matrix+copper-rich phase.
The antibacterial ferritic stainless steel of high corrosion-resistant the most according to claim 1 and 2, it is characterised in that the some pitting position of the antibacterial ferritic stainless steel of described high corrosion-resistant is 0.25～0.35V.
4. a manufacture method for the antibacterial ferritic stainless steel of high corrosion-resistant, it comprises the steps:
1) smelt
By following chemical composition through electric arc furnace smelting, its chemical component weight percentage ratio is: C≤0.015%, Si:0.1～0.5%, Mn:0.1～0.5%, P≤0.035%, S≤0.010%, Cr:18～22%, Mo:0.5～1.0%, Cu:1.5～2.5%, N:0.015～0.020%, 8 (C+N)≤Ti≤0.5%, remaining is Fe and inevitable impurity；
2) continuous casting
Molten steel after VOD stove processes is delivered to conticaster continuous casting and is obtained continuous casting billet, and continuous casting steel billet carries out hot repair mill process；
3) hot rolling+batch+cool down
Continuous casting billet is heated to 1150～1200 DEG C, carries out hot rolling, finishing temperature 850～900 DEG C after insulation 190～230min；Batching after Water-Curta in Cooling, coiling temperature is 600～650 DEG C, then water-cooled again；
4) hot-roll annealing+pickling
Hot-roll annealing temperature is 850～900 DEG C, and the hot-roll annealing time is 2～4h；
5) cold rolling+cold rolled annealed+pickling
Cold roling reduction is 60～80%, and cold rolled annealed temperature is 850～900 DEG C, and unit thickness annealing time is 1～1.5min/mm, smooth rear acquisition finished product ferritic stainless steel.
The manufacture method of the antibacterial ferritic stainless steel of high corrosion-resistant the most according to claim 4, it is characterized in that, step 1) smelting process first delivers to electric arc furnace by blast-melted, add high-carbon Cr-Fe alloy and heat, preparing to obtain mother liquor of stainless steel, deliver to AOD furnace decarburization, add ferro-molybdenum, deliver to VOD stove, after oxidized, reduction, vacuum decarburization, then feed titanium silk and process.
6. according to the manufacture method of the antibacterial ferritic stainless steel of the high corrosion-resistant described in claim 4 or 5, it is characterised in that the microscopic structure of the antibacterial ferritic stainless steel of described high corrosion-resistant is ferrite matrix+copper-rich phase.
7. according to the manufacture method of the antibacterial ferritic stainless steel of high corrosion-resistant described in any one of claim 4-6, it is characterised in that the some pitting position of the antibacterial ferritic stainless steel of described high corrosion-resistant is 0.25～0.35V.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111383861A (en) * | 2018-12-28 | 2020-07-07 | 东莞科力线材技术有限公司 | Magnetic conductive material for electromagnetic relay and preparation method thereof |
| CN114082782A (en) * | 2021-11-20 | 2022-02-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Anti-wrinkling cold rolling method for 443 ultra-pure ferrite stainless steel |
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| CN114082782A (en) * | 2021-11-20 | 2022-02-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Anti-wrinkling cold rolling method for 443 ultra-pure ferrite stainless steel |
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