CN101586215A - Ferrite antibacterial stainless steel and manufacture method thereof - Google Patents
Ferrite antibacterial stainless steel and manufacture method thereof Download PDFInfo
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- CN101586215A CN101586215A CNA2008100379135A CN200810037913A CN101586215A CN 101586215 A CN101586215 A CN 101586215A CN A2008100379135 A CNA2008100379135 A CN A2008100379135A CN 200810037913 A CN200810037913 A CN 200810037913A CN 101586215 A CN101586215 A CN 101586215A
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Abstract
The invention provides a ferrite antibacterial stainless steel and a manufacture method thereof. A ferrite antibacterial stainless steel plate is manufactured by adding Ag-Cu binary master alloy into an ordinary ferrite stainless steel, and comprises the following chemical compositions by weight percent: no more than 0.1 wt percent of C, no more than 2.0 wt percent of Si, no more than 2.0 wt percent of Mn, no more than 0.04 wt percent of P, no more than 0.03 wt percent of S, 15.0 to 22.0 wt percent of Cr, no more than 0.1 wt percent of N, 0.10 to 1.0 wt percent of the Ag-Cu binary master alloy, and the balance of Fe and unavoidable impurities. The ferrite antibacterial stainless steel plate keeps the favorable mechanical properties and corrosion resistance of the prior steel, has bright surface, can be processed into products in various shapes, and is applied to aspects of washing machines, tableware, kitchen utensils and the like.
Description
Technical field
The present invention relates to the stainless material class, be specifically related to ferritic stainless steel, relate more specifically to a kind of ferrite antibacterial stainless steel and manufacture method thereof.
Background technology
Along with expanding economy, the application of stainless steel in foodstuffs industry, food and restaurant service industry and family life more and more widely, people wish that Stainless Steel Ware and tableware are except that having stainless, sparkling clean characteristics, preferably also have anti-go mouldy, antibiotic, sterilizing function, like this, anti-bacteria stainless steel arises at the historic moment.
So-called anti-bacteria stainless steel adds an amount of element with antibacterial effect exactly in stainless steel, as copper, silver, the steel of producing have stable processing characteristics and good antimicrobial property after germ resistance thermal treatment.Anti-bacteria stainless steel is compared with similar stainless steel, and its corrosion resisting property, physicals are suitable substantially, and mechanical property also is more or less the same.
Anti-bacteria stainless steel has good solidity to corrosion and anti-microbial property, use in a large number in tableware in the worktable of galley equipment, foodstuffs industry and vessel, medicine equipment, daily life and the fields such as carriage that hang towel support, refrigerator, and some facilities of public place such as the handrail of bus, banister, call box, guardrail etc. also should use anti-bacteria stainless steel for stopping cross infection.
Table 1 has been listed the chemical ingredients of copper-bearing ferritic antibacterial stainless steel in the previous patent document.
The chemical ingredients of table 1 copper-bearing ferritic antibacterial stainless steel (wt%)
| Publication number | C | Si | Mn | S | P | Cr | Ni | N | Cu | Mo | Other |
| CN1807672 | ≤0.05 | ≤1 | ≤1 | ≤ 0.02 | ≤ 0.05 | 16～ 20 | ≤2 | ≤ 0.05 | 0.6～ 2.5 | 2 | Ti≤0.5, Nb≤0.5, rare earth≤0.1 |
| CN1827824 | ≤0.08 | 12～ 14 | 0.7～ 2.2 | ||||||||
| CN1498981 | ≤0.2 | ≤3 | ≤2 | 10～ 30 | 0.4～ 2.2 | Zn≤1 | |||||
| JP347735/95 | ≤0.1 | ≤2 | ≤2 | 10～ 30 | 0.4～ 3 | ≤3 | 0.01～1Nb and/or Ti, Al≤1, Zr≤1, V≤1, B≤0.05, rare earth≤0.05 |
| JP8145/2000 | ≤0.02 | 0.01 ～ 0.4 | ≤1 | 0.06 0.12 | 18～ 32 | ≤ 0.02 | 1～ 3.5 | 1.5 ～ 4.5 | Ti：0.05 0.3，Al：0.2，Nb≤0.2 | ||
| JP140289/98 | ≤0.03 | ≤1 | ≤2 | ≤ 0.005 | 0.01 ～ 0.1 | 10～ 30 | ≤ 0.03 | 1～ 3.5 | O≤0.004，Nb、Ti、V、 Ta、Hf、Zr：0.05～1 | ||
| JP306352/98 | ≤0.03 | 0.1 ～ 2 | ≤2 | ≤ 0.005 | 0.01 ～ 0.1 | 10～ 40 | 1～5 | O≤0.01，Nb、Ti、V、 Ta、Hf、Zr：0.05～1 | |||
| JP324920/98 | ≤0.03 | 0.1 ～ 1 | 0.1 ～1 | ≤ 0.01 | ≤ 0.03 | 6～ 25 | 1～ 5 | ≤ 0.03 | 1～5 | ≤2 | Ti≤0.8，Nb ≤0.8，Zr≤0.8， C+N≤0.04， 0.1×Cu(％)≤Ni(％)≤ Cu(％) |
These copper-bearing ferritic antibacterial stainless steels all are to have added some coppers on the basis of original steel grade as can be seen from Table 1, the production of these steel grades need increase special thermal treatment process, separate out so that have the copper-rich phase of anti-microbial property, and the copper of high level can make material crack when continuous casting and hot-work, therefore the addition of copper is subjected to strict restriction when smelting, and its germ resistance is affected.
Because the stainless production of silver-containing antibacterial does not need to increase special thermal treatment process, and hot-forming property is good, producing feasibility is strong, long acting antibiotic is good, its cost is suitable substantially with the cupric anti-bacteria stainless steel, therefore, the stainless development potentiality of silver-containing antibacterial is huge, is the emphasis of following anti-bacteria stainless steel research and development and production.But silver solubleness in stainless steel is very little, forms segregation easily, thereby has reduced germ resistance, if add-on is too much, can destroy stainless original processing characteristics and performance such as corrosion-resistant, and increase cost.Therefore the Ag element is uniformly distributed in the stainless steel is the stainless gordian technique of silver-containing antibacterial in research.Table 2 has been listed the chemical ingredients of the Ag of containing anti-bacteria stainless steel more of the prior art.
Some contain the chemical ingredients (wt%) of Ag anti-bacteria stainless steel in table 2 prior art
| Publication number | C | Si | Mn | S | P | Cr | Ni | N | Ag | Other |
| CN1272889A | ＜0.1 | ＞10 | 0.001～ 0.30 | V：0.001～1.0 | ||||||
| CN1256716A | ＜0.1 | ＞10 | 0.001～ 1 | Sn：0.0002～0.02. Zn：0.002～0.02. |
| In Pt:0.0002～0.02 more than a kind or a kind | ||||||||||
| CN1789471A | ＜0.08 | ＜1 | ＜2 | ＜0.03 | ＜0.035 | 17～20 | 7～12 | Cu-Ag-Zn ternary interalloy: 0.10～10.0 | ||
| CN1664154A | 0.03～ 0.15 | 0.1～ 1 | 7～ 15 | ＜0.02 | ＜0.03 | 11～15 | 1.0～3.5 | 0.06～ 0.3 | 0.01～ 0.1 | Cu：1.0～3.0， Nb：0～0.10 |
Contain in the open disclosed Ag of the containing anti-bacteria stainless steel of communique CN1272889A of Chinese patent: the Ag of the chromium, 0.001～0.30% (weight) that 10% (weight) is above or also contain the V of 0.001～1.0% (weight), in stainless steel, be dispersed with the silver suboxide more than 0.0005% in addition, this silver suboxide content is below 1.1 times of silver content, for silver suboxide is dispersed in the stainless steel, when carrying out the continuous casting of molten steel, continuous casting speed is limited to 0.8～1.6 meter/minute.The open disclosed anti-bacteria stainless steel of communique CN1256716A of Chinese patent comprises: the chromium that 10% (weight) is above, the Ag of～1% 0.001 (weight), perhaps further contain and be selected from Sn:0.0002～0.02% (weight), Zn:0.002～0.02% (weight), in Pt:0.0002～0.02% (weight) more than a kind or a kind, make the following silver particles of average out to 500 μ m, being scattered in more than a kind in this stainless steel in silver oxide and the silver-colored sulfide, adding up to area occupation ratio is more than 0.001%, and in order to make silver particles, silver oxide and silver-colored sulfide homodisperse, continuous casting speed is limited to 0.8～1.6 meter/minute.As seen, these two kinds contain the Ag anti-bacteria stainless steel and all adopt control continuous casting speed, silver particles and patina thing are distributed in the alloy equably, thereby obtain high antibiotic rate, so just require certain smelting and continuous casting installation for casting and skilled operative technique.
The open communique CN1789471A of Chinese patent discloses a kind of austenite antimicrobial stainless steel, this anti-bacteria stainless steel is the Cu-Ag-Zn ternary master alloy that adds 0.1～10% (weight) in common 300 series austenitic stainless steel, but the optimal components of Cu-Ag-Zn ternary master alloy is difficult for grasping, and Zn can produce detrimentally affect to stainless hot workability, in addition, this anti-bacteria stainless steel also need pass through shrend thermal treatment, and technology is comparatively complicated.
The open communique CN1664154A of Chinese patent also discloses a kind of austenite antimicrobial stainless steel, and it contains the N amount and reaches 0.06～0.3%, has increased steel-making cost, and its to contain the Cu amount be 1.0～3.0%, need through shrend and ageing treatment, complex process.
In order to address the above problem, the present inventor is by the adjustment to smelting technology, and content and the distribution situation of control Ag in alloy developed a kind of ferrite antibacterial stainless steel.This ferrite antibacterial stainless steel has kept the mechanical property and the corrosion resisting property of original steel, and product having enhanced antibacterial action.
One object of the present invention is to provide a kind of ferrite antibacterial stainless steel.
Another object of the present invention is to provide the manufacture method of described ferrite antibacterial stainless steel.
Summary of the invention
First aspect of the present invention provides a kind of ferrite antibacterial stainless steel, the chemical ingredients of described anti-bacteria stainless steel comprises: C≤0.1wt%, Si≤2.0wt%, Mn≤2.0wt%, P≤0.04wt%, S≤0.03wt%, Cr 15.0～22.0wt%, N≤0.1wt%, Ag-Cu binary master alloy 0.10～1.0wt%, surplus is Fe and unavoidable impurities.
In a preferred implementation: the weight percent of described Ag-Cu binary master alloy consists of: Ag:5～50%, Cu:50～95%.
Below, the chemical ingredients of martensite antimicrobial stainless steel of the present invention is done as being described in detail.
C: be the element that increases alloy strength, but be difficult for too much that if too much words can reduce the solidity to corrosion of steel, so C content generally is controlled at below the 0.1wt%.
Si: add as reductor, but add-on too much can promote the formation of intermetallic compound, thereby influence the use properties of steel, so the add-on of Si should be controlled at below the 2.0wt%.
Mn: the thermoplasticity to steel plays a role, but add-on too much can reduce the solidity to corrosion of steel, and its content should be controlled at below the 2.0wt%.
P, S: for thermoplasticity and the corrosion proof consideration to steel, these two constituent contents will hang down as far as possible, should control P≤0.04%, S≤0.03%.
Cr: the corrosion proof important element that improves steel, when its content was on the low side, the solidity to corrosion of steel was relatively poor, can not reach service requirements, but its too high levels can increase ferrite and intermetallic compound is separated out tendency, so Cr content preferably is controlled between 15.0～22.0%.
N: can increase the intensity of steel, also can improve the solidity to corrosion of steel, control N≤0.1wt% is in order to make alloy be easy to smelt and guarantee plasticity.
Ag-Cu binary master alloy: silver and copper all have germ resistance, when its add-on less than 0.1% the time, the germ resistance of steel is undesirable, along with the increase of its content, the anti-microbial property of steel improves gradually.Cu in the Ag-Cu alloy also can improve solidity to corrosion, wear resistance and the cold machine-shaping of steel, but Cu content was above 1.0% o'clock, can reduce thermoplasticity, and Ag more also can produce detrimentally affect to thermoplasticity, so the Ag-Cu alloy content should be controlled at below 1.0%.Ag content in the Ag-Cu alloy was less than 5.0% o'clock, consider the needs of germ resistance, will when stainless steel smelting, add more Ag-Cu alloy, so just added more Cu, the thermoplasticity of steel is descended, otherwise, Ag content in the Ag-Cu alloy was greater than 50% o'clock, the solubleness of Ag-Cu alloy in steel is lower, can influence the germ resistance of steel again, so comparatively suitable between Ag content is controlled at 5.0～50% in the Ag-Cu master alloy.
Second aspect of the present invention provides a kind of manufacture method of ferrite antibacterial stainless steel, this manufacture method comprises smelting, casting, hot rolling, annealing, pickling, polishing, wherein before smelting earlier with Ag and two kinds of elements of Cu in Ag account for 5～50%, Cu accounts for 50～95% ratio melting and makes master alloy, again will described master alloy as smelting in a kind of raw material that adds ferrite antibacterial stainless steel of preparing burden.
The present invention selects for use vacuum induction furnace, electric furnace-AOD duplex to smelt or electric furnace-AOD-VOD smelting stainless steel, die casting or continuous casting steel billet, and hot-roll annealing is handled, and obtains hot-rolled product, also can be cold rolling again, anneal, polishing obtains cold-rolled products.One of most critical step was earlier Ag and two kinds of elements of Cu to be made master alloy through melting by a certain percentage in the manufacture method of ferrite antibacterial stainless steel of the present invention, it was used as in the raw material that a kind of batching joins anti-bacteria stainless steel again and smelted.Because the solubleness of this master alloy in ferritic stainless steel is bigger, liquation stirs when smelting, and antiseptic elements is uniformly distributed in the steel, so that steel has anti-microbial property, and property retention previous levels such as the mechanics of steel, anti-corrosion, processing simultaneously.
Beneficial effect of the present invention is: stainless steel of the present invention has kept original steel grade excellent mechanical property and corrosion resistance, and has good antibacterial property, can be processed into the product of different shape, is applied to aspects such as washing machine, tableware, kitchen utensils.
Embodiment
Below for a more detailed description with embodiment to the present invention.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1-5
Ag and two kinds of elements of Cu are made master alloy in the ratio melting shown in the table 3, join it in raw material of ferrite antibacterial stainless steel as a kind of batching again, smelt or electric furnace-AOD-VOD smelting stainless steel with vacuum induction furnace, electric furnace-AOD again, the casting steel billet, it is thick to be hot-rolled down to 6mm, and in 750 ℃ of annealing, it is thick to be cold-rolled to 2mm again, through annealing, pickling, polish then.
Comparative example 1
Standard brand is 430 ferritic stainless steel, and its chemical ingredients sees Table 3.
The chemical ingredients (wt%) of the ferrite antibacterial stainless steel of table 3 embodiment 1-5 and the ferritic stainless steel of comparative example 1
| Sequence number | Standard brand | C | Si | Mn | P | S | Cr | N | Ag-Cu |
| Embodiment 1 | 0.021 | 0.31 | 0.32 | 0.016 | 0.005 | 17.3 | 0.011 | (0.1 argentiferous 50%) | |
| Embodiment 2 | 0.026 | 0.32 | 0.24 | 0.017 | 0.004 | 17.4 | 0.013 | (0.3 argentiferous 30%) | |
| Embodiment 3 | 0.024 | 0.27 | 0.29 | 0.018 | 0.004 | 17.2 | 0.012 | (0.5 argentiferous 20%) | |
| Embodiment 4 | 0.022 | 0.28 | 0.33 | 0.018 | 0.004 | 17.5 | 0.015 | (0.8 argentiferous 10%) | |
| Embodiment 5 | 0.021 | 0.21 | 0.37 | 0.021 | 0.003 | 17.7 | 0.014 | (1.0 argentiferous 5%) | |
| Comparative example 1 | Industry 430 | 0.031 | 0.27 | 0.30 | 0.026 | 0.005 | 17.3 | 0.018 | 0 |
Test example 1
The ferrite antibacterial stainless steel of embodiment of the invention 1-5 and the ferritic stainless steel of comparative example 1 are carried out Mechanics Performance Testing, and test result sees Table 4.
Test example 2
By JIS Z2801-2000 " antibiotic fabricated product---anti-microbial property test method and antibacterial effect " standard the ferrite antibacterial stainless steel of embodiment of the invention 1-5 and the ferritic stainless steel of comparative example 1 are carried out the anti-microbial property test, its test result sees Table 4, and main testing sequence is as follows:
1) test strain;
Intestinal bacteria (Escherichia coli SIM B282)
Streptococcus aureus (Staphylococcus aureus SIM B283)
2) detection method:
(1) sample is cut into the size of 50.0 * 50.0 * 2.0mm size, sterilization (in triplicate).
(2) on sample, drip some milliliters of bacterium liquid, make colony number maintain 10
5
(3) plastics film is covered specimen surface, put into aseptic plate then, in 36 ± 1 ℃ of constant incubators, cultivate after 24 hours, viable bacteria is counted.
(4) with the ferritic stainless steel of the not argentiferous same model of comparative example 1 sample in contrast, repeat aforesaid operations.
3) antibiotic rate calculates
Antibiotic rate=[(A-B)/A] * 100%
In the formula: the average viable count of control sample after A-24 hour
Antibiotic sample average viable count after B-24 hour.
The ferrite antibacterial stainless steel of table 4 embodiment 1-5 and the ferrite stainless steel mechanical property of comparative example 1 and anti-microbial property are relatively
| Sequence number | Tensile strength (Mpa) | Yield strength (Mpa) | Unit elongation (%) | Antibiotic rate (%) |
| Embodiment 1 | 471 | 280 | 32 | ＞99 |
| Embodiment 2 | 482 | 292 | 31 | ＞99 |
| Embodiment 3 | 475 | 285 | 33 | ＞99 |
| Embodiment 4 | 478 | 294 | 30 | ＞99 |
| Embodiment 5 | 489 | 278 | 30 | ＞99 |
| Comparative example 1 | 495 | 295 | 31 | 0 |
As can be seen from Table 4, ferrite antibacterial stainless steel of the present invention is compared with the ferritic stainless steel of argentiferous same model not, has not only kept the mechanical property of original steel grade, and antibiotic rate is all more than 99%, and anti-microbial property is good.
Test example 3
(national standard: GB/T 17899-1999) ferrite antibacterial stainless steel of embodiment of the invention 1-5 and the ferritic stainless steel of comparative example 1 are carried out the corrosion resistance nature test, test result sees Table 5 according to the stainless steel pitting potential measuring method.
The anti-pitting attack performance of the ferrite antibacterial stainless steel of table 5 embodiment 1-5 and the ferritic stainless steel of comparative example 1 relatively
| Sequence number | E′ b10 (V) |
| Embodiment 1 | 0.14 |
| Embodiment 2 | 0.13 |
| Embodiment 3 | 0.12 |
| Embodiment 4 | 0.13 |
| Embodiment 5 | 0.15 |
| Comparative example 1 | 0.14 |
As can be seen from Table 5, the ferrite antibacterial stainless steel of embodiment 1-5 is compared with the anti-pitting potential of the not argentiferous same model ferritic stainless steel of comparative example 1, and solidity to corrosion is suitable, and difference is not obvious, has kept the solidity to corrosion of original steel grade.
Claims (3)
1, a kind of ferrite antibacterial stainless steel, it is characterized in that, the chemical ingredients of described anti-bacteria stainless steel comprises: C≤0.1wt%, Si≤2.0wt%, Mn≤2.0wt%, P≤0.04wt%, S≤0.03wt%, Cr 15.0～22.0wt%, N≤0.1wt%, Ag-Cu binary master alloy: 0.10～1.0wt%, surplus is Fe and unavoidable impurities.
2, ferrite antibacterial stainless steel according to claim 1, the weight percent of wherein said Ag-Cu binary master alloy consists of: Ag:5～50%, Cu:50～95%.
3, the manufacture method of the described ferrite antibacterial stainless steel of claim 1, described manufacture method comprises smelting, casting, hot rolling, annealing, pickling, polishing, it is characterized in that, before smelting earlier with Ag and two kinds of elements of Cu in Ag account for 5～50%, Cu accounts for 50～95% ratio melting and makes master alloy, again will described master alloy as smelting in a kind of raw material that adds ferrite antibacterial stainless steel of preparing burden.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032231B (en) * | 2014-07-03 | 2016-04-20 | 王家帮 | A kind of encloses container and heat treating method thereof |
| CN107709591A (en) * | 2015-07-02 | 2018-02-16 | 杰富意钢铁株式会社 | Cold rolled stainless steel sheet raw material and its manufacture method and cold-rolled steel sheet |
| CN107881413A (en) * | 2017-10-18 | 2018-04-06 | 江苏理工学院 | A kind of antibacterial duplex stainless steel and its processing technology |
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2008
- 2008-05-23 CN CNA2008100379135A patent/CN101586215A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032231B (en) * | 2014-07-03 | 2016-04-20 | 王家帮 | A kind of encloses container and heat treating method thereof |
| CN107709591A (en) * | 2015-07-02 | 2018-02-16 | 杰富意钢铁株式会社 | Cold rolled stainless steel sheet raw material and its manufacture method and cold-rolled steel sheet |
| US10801084B2 (en) | 2015-07-02 | 2020-10-13 | Jfe Steel Corporation | Material for cold rolled stainless steel sheets, method for manufacturing the same, and cold rolled steel sheet |
| CN107881413A (en) * | 2017-10-18 | 2018-04-06 | 江苏理工学院 | A kind of antibacterial duplex stainless steel and its processing technology |
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