CN101871079B - Copper-bearing ferritic antibacterial stainless steel and manufacturing method thereof - Google Patents
Copper-bearing ferritic antibacterial stainless steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to a copper-bearing ferritic antibacterial stainless steel and a manufacturing method thereof. The stainless steel comprises the following ingredients in percentage by weight (weight percent): less than or equal to 0.02 percent of C, less than or equal to 0.6 percent of Si, less than or equal to 0.5 percent of Mn, less than or equal to 0.04 percent of P, less than or equal to 0.01 percent of S, 16.0 to 22.0 percent of Cr, 0.2 to 0.6 percent of Ni, less than or equal to 0.02 percent of N, 1.0 to 1.6 percent of Cu, 0.02 to 0.08 percent of Al and the balance of Fe and unavoidable impurities. The copper-bearing ferritic antibacterial stainless steel of the invention has excellent plasticity, can be processed into products with different shapes and is applied to various fields of home appliances, table wares, kitchen utensils and the like.
Description
Technical field
The present invention relates to field of metallurgy, relate in particular to a kind of copper-bearing ferritic antibacterial stainless steel and manufacture method thereof.
Background technology
Along with expanding economy, the application of stainless steel in foodstuffs industry, catering industry and family life is more and more extensive.People wish stainless steel product except having antirust and bright and clean performance, preferably also have anti-going mouldy and antibacterial.
Anti-bacteria stainless steel, in stainless steel, add exactly an amount of metallic element with antibacterial effect (such as copper and silver), steel are behind antibacterial heat-treatment, being rich in the antibiotic of antiseptic elements separates out from matrix, form the small-particle that even dispersion distributes, when this stainless steel with after water contacts, be exposed to the water-soluble rear formation hydrated ion of antibacterial metal of stainless steel surface, then contact with bacterium, destroy cytolemma, make protein coagulating or damage its DNA, thereby stop bacterial growth breeding or direct eliminating bacteria.
The Cu content range of existing JP140289/98 and the disclosed copper-bearing ferritic antibacterial stainless steel of CN1807672 is larger, when Cu content is larger, for example greater than 1.6% the time, material is cracked when continuous casting and hot-work, and increase Cu Rich Phase Precipitation quantity, and then reduce the plasticity of material; And smaller when Cu content, for example less than 1.0% the time, stainless anti-microbial property again can be not enough.The disclosed copper-bearing ferritic antibacterial stainless steel of existing CN1827824, JP8145/2000, CN1498981, JP306352/98, JP347735/95 and JP140289/98 is not nickeliferous composition, and a small amount of nickel can improve plasticity and the corrosion resistance nature of material.Nickel too high levels in the disclosed copper-bearing ferritic antibacterial stainless steel of existing JP324920/98, it has strengthened stainless production cost, but also brings difficulty can for stainless process for processing.The disclosed copper-bearing ferritic antibacterial stainless steel of existing CN1807672 and JP324920/98 does not contain Al, and this just causes stainless plasticity and corrosion resistant performance to descend, because an amount of Al can improve stainless plasticity and corrosion resistance nature.
Summary of the invention
The present invention will solve the problem that existing copper-bearing ferritic antibacterial stainless steel exists, and provides a kind of and has good plasticity, corrosion resistance nature and anti-microbial property, and have the copper-bearing ferritic antibacterial stainless steel of excellent machinability.
Another object of the present invention provides a kind of method of making copper-bearing ferritic antibacterial stainless steel of the present invention.
Copper-bearing ferritic antibacterial stainless steel of the present invention contains the composition of following weight percent (wt%): C :≤0.02, Si :≤0.6, Mn :≤0.5, P :≤0.04, S :≤0.01, Cr:16.0～22.0, Ni:0.2～0.6, N :≤0.02, Cu:1.0～1.6, Al:0.02～0.08, all the other are Fe and inevitable impurity.
Preferably, Ni (wt%): 0.3～0.5, Cu (wt%): 1.2～1.4, Al (wt%): 0.04～0.06.
Preferably, C:0.01～0.02, Si:0.29～0.6, Mn:0.3～0.5, P:0.022～0.04, S:0.001～0.01, N:0.009～0.02.
Below the Design Mechanism of copper-bearing ferritic antibacterial stainless steel of the present invention is elaborated:
Carbon: be the element that increases alloy strength, but be difficult for too much, otherwise meeting loss material plasticity preferably is controlled at below 0.02%.
Silicon: add as reductor, too much can reduce plasticity but add, preferably be controlled at below 0.6%.
Manganese: manganese can improve thermoplasticity, but can reduce plasticity and solidity to corrosion too much the time, preferably is controlled at below 0.5%.
Phosphorus, sulphur: for thermoplasticity and corrosion proof consideration, these two elements will hang down as far as possible, should control P≤0.04%, S≤0.03%.
Chromium: chromium is to improve corrosion proof important element, can not reach service requirements when being lower than 16%, but can increase the tendency that ferrite and intermetallic compound are separated out when surpassing 22%, preferably is controlled at 16～22%.
Nitrogen: can gain in strength, require N≤0.02%th, for guaranteeing that material has the consideration of good plasticity.
Copper: be the important element of giving the material anti-microbial property, can not satisfy the requirement of anti-microbial property when less, but then can damage plasticity and processibility when more, be controlled at 1.0～1.6% comparatively desirable.
Nickel: a small amount of nickel can improve plasticity and the corrosion resistance nature of material, can increase production cost and infringement processing characteristics when more, is controlled at 0.2～0.6% comparatively desirable.
Al: add a certain amount of Trace Aluminium, nitrogen, the oxygen of material is played stable effect, thinning microstructure improves plasticity and corrosion resistance nature etc., but bring difficulty can for smelting and the continuous casting of material when more.Desirable scope is 0.02～0.08%.
Copper-bearing ferritic antibacterial stainless steel of the present invention can be made by the following method, and it comprises:
(1) batching obtains mother liquor through electric furnace-AOD-VOD Triplex Refining;
(2) the mother liquor continuous casting becomes steel billet;
(3) hot rolling steel billet, hot rolling initial temperature are controlled at 1100-1150 ℃, and finishing temperature is controlled at 900-950 ℃;
(4) antibiotic anneal obtains hot-rolled product.
Preferably, antibiotic anneal condition is: 700～900 ℃, be incubated 4～6 hours.
Preferably, obtain carrying out again behind the hot pressing product cold rolling, anneal, polishing obtains cold-rolled products.
Preferably, the anneal condition after cold rolling is: 850-900 ℃, be incubated 1-3 minute.
Compared with prior art, copper-bearing ferritic antibacterial stainless steel of the present invention has more good plasticity, corrosion resistance nature and anti-microbial property, and has excellent machinability.Antibiotic ferritic stainless steel production technique of the present invention is simple, and anti-microbial property is good, can be processed into different shape, is applied to the aspects such as household electrical appliances, tableware, kitchen utensils.In addition, the production cost of copper-bearing ferritic antibacterial stainless steel of the present invention is also lower.
Embodiment
The stainless steel chemical component of embodiment and Comparative Examples sees Table 1.Batching is smelted through electric furnace-AOD-VOD and is obtained mother liquor, the mother liquor continuous casting becomes steel billet, then hot rolling of steel billet is thick to 6mm, wherein hot rolling initial temperature is controlled at 1125 ℃, finishing temperature is controlled at 925 ℃, then carries out antibacterial heat-treatment in 5 hours 800 ℃ of lower insulations, is cold-rolled to 2mm thick again, and then insulation was carried out anneal in 2 minutes under 860 ℃, obtained stainless steel finally by pickling and polishing.The stainless steel that obtains is carried out the detection of anti-microbial property, mechanical property and corrosion resistance nature.
The test of anti-microbial property is undertaken by JIS Z2801-2000 " antibiotic fabricated product-anti-microbial property test method and antibacterial effect " standard.Used test strain is intestinal bacteria (Escherichia coli SIMB282) and streptococcus aureus (Staphylococcus aureus SIM B283).Concrete detection method is as follows: (1) is cut into sample the size of 50.0 * 50.0 * 2.0mm size, sterilization (in triplicate); (2) drip some milliliters of bacterium liquid at sample, make colony number maintain 105; (3) plastics film is covered specimen surface, then put into aseptic plate, in 36 ± 1 ℃ of constant incubators, cultivate after 24 hours, viable bacteria is counted.Respectively three duplicate samples are tested, and then calculate average antibiotic rate, the calculation formula of antibiotic rate: antibiotic rate=[(A-B)/A] * 100%, A represents the average viable count of control sample after 24 hours in the formula, B represents antibiotic sample average viable count after 24 hours.The detected result of anti-microbial property sees Table 2.
The test of mechanical property is carried out according to the JIS-Z2241 standard, comprises the test of tensile strength test, yield strength test and unit elongation, and test result sees Table 3.
The corrosion resistance nature test is according to stainless steel iron trichloride pitting corrosion test method (national standard: GB/T 17897-1999) carry out.The detected result of corrosion resistance nature sees Table 4
The stainless anti-microbial property of the embodiment of the invention is good as can be seen from Table 2, has reached the requirement of anti-biotic material, and anti-microbial property is very good when Cu content surpasses 1.2%, increases Cu content again and can obviously not improve stainless anti-microbial property.
The stainless plasticity of the embodiment of the invention (mainly referring to unit elongation) is apparently higher than the stainless plasticity of Comparative Examples as can be seen from Table 3, and tracing it to its cause is not add that Ni does not add Al, 4 of Comparative Examples add Al and do not add Ni because Cu too high levels, the Comparative Examples 2 of Comparative Examples 1 add Ni and Al, 3 of Comparative Examples.
As can be seen from Table 4, embodiment of the invention stainless steel has good corrosion resistance nature.
The stainless chemical composition of table 1. embodiment and Comparative Examples (wt, %)
| Sequence number | C | Si | Mn | P | S | Cr | N | Cu | Ni | Al |
| Embodiment 1 | 0.010 | 0.34 | 0.42 | 0.029 | 0.001 | 16.7 | 0.009 | 1.0 | 0.21 | 0.02 |
| Embodiment 2 | 0.012 | 0.51 | 0.36 | 0.026 | 0.002 | 17.5 | 0.012 | 1.2 | 0.35 | 0.04 |
| Embodiment 3 | 0.017 | 0.47 | 0.46 | 0.024 | 0.001 | 18.6 | 0.016 | 1.4 | 0.42 | 0.05 |
| Embodiment 4 | 0.018 | 0.58 | 0.30 | 0.022 | 0.002 | 20.1 | 0.016 | 1.5 | 0.54 | 0.06 |
| Embodiment 5 | 0.019 | 0.29 | 0.37 | 0.029 | 0.002 | 21.8 | 0.018 | 1.6 | 0.60 | 0.08 |
| Comparative Examples 1 | 0.015 | 0.38 | 0.35 | 0.021 | 0.001 | 17.1 | 0.015 | 1.8 | 0.56 | 0.04 |
| Comparative Examples 2 | 0.020 | 0.33 | 0.33 | 0.027 | 0.001 | 16.3 | 0.014 | 1.4 | - | - |
| Comparative Examples 3 | 0.019 | 0.31 | 0.34 | 0.025 | 0.002 | 17.7 | 0.017 | 1.5 | 0.53 | - |
| Comparative Examples 4 | 0.017 | 0.21 | 0.44 | 0.026 | 0.002 | 18.4 | 0.016 | 1.5 | - | 0.06 |
| Comparative Examples 5 (industry 430) | 0.034 | 0.37 | 0.34 | 0.023 | 0.003 | 16.8 | 0.028 | - | - | - |
The stainless anti-microbial property of table 2. embodiment and Comparative Examples
| Sequence number | Sterilizing rate, % |
| Embodiment 1 | ＞99.0 |
| Embodiment 2 | ＞99.7 |
| Embodiment 3 | ＞99.9 |
| Embodiment 4 | ＞99.9 |
| Embodiment 5 | ＞99.9 |
| Comparative Examples 1 | ＞99.9 |
| Comparative Examples 2 | ＞99.9 |
| Comparative Examples 3 | ＞99.9 |
| Comparative Examples 4 | ＞99.9 |
| Comparative Examples 5 | 0 |
The stainless mechanical property of table 3. embodiment and Comparative Examples
| Sequence number | Tensile strength, MPa | Yield strength, MPa | Unit elongation % |
| Embodiment 1 | 481 | 283 | 31 |
| Embodiment 2 | 484 | 285 | 32 |
| Embodiment 3 | 497 | 298 | 32 |
| Embodiment 4 | 508 | 311 | 33 |
| Embodiment 5 | 516 | 322 | 33 |
| Comparative Examples 1 | 515 | 318 | 25 |
| Comparative Examples 2 | 490 | 295 | 27 |
| Comparative Examples 3 | 492 | 294 | 28 |
| Comparative Examples 4 | 488 | 285 | 28 |
| Comparative Examples 5 | 485 | 278 | 30 |
The stainless anti-pitting attack performance of table 4. embodiment and Comparative Examples
| Sequence number | E′ b10，v |
| Embodiment 1 | 0.15 |
| Embodiment 2 | 0.15 |
| Embodiment 3 | 0.21 |
| Embodiment 4 | 0.23 |
| Embodiment 5 | 0.29 |
| Comparative Examples 1 | 0.14 |
| Comparative Examples 2 | 0.11 |
| Comparative Examples 3 | 0.16 |
| Comparative Examples 4 | 0.18 |
| Comparative Examples 5 | 0.13 |
Claims (7)
1. copper-bearing ferritic antibacterial stainless steel, it contains the composition of following weight percent: C :≤0.02, Si :≤0.6, Mn :≤0.5, P :≤0.04, S :≤0.01, Cr:16.0～22.0, Ni:0.2～0.6, N :≤0.02, Cu:1.0～1.6, Al:0.02～0.08, all the other are Fe and inevitable impurity;
Described steel is by the method manufacturing that comprises electric furnace-AOD-VOD Triplex Refining.
2. stainless steel as claimed in claim 1 is characterized in that, Ni:0.3～0.5, Cu:1.2～1.4, Al:0.04～0.06.
3. stainless steel as claimed in claim 1 is characterized in that, C:0.01～0.02, Si:0.29～0.6, Mn:0.3～0.5, P:0.022～0.04, S:0.001～0.01, N:0.009～0.02.
4. the manufacture method of a copper-bearing ferritic antibacterial stainless steel, it comprises the steps:
(1) according to the composition of following weight percent: C :≤0.02, Si :≤0.6, Mn :≤0.5, P :≤0.04, S :≤0.01, Cr:16.0～22.0, Ni:0.2～0.6, N :≤0.02, Cu:1.0～1.6, Al:0.02～0.08, all the other are Fe and inevitable impurity, obtain mother liquor through electric furnace-AOD-VOD Triplex Refining;
(2) the mother liquor continuous casting becomes steel billet;
(3) hot rolling steel billet, hot rolling initial temperature are controlled at 1100-1150 ℃, and finishing temperature is controlled at 900-950 ℃;
(4) antibiotic anneal obtains hot-rolled product.
5. manufacture method as claimed in claim 4 is characterized in that, described antibiotic anneal condition is: 700～900 ℃, be incubated 4～6 hours.
6. such as claim 4 or 5 described manufacture method, it is characterized in that, obtain heat prick carry out again behind the product cold rolling, anneal, polishing obtains cold-rolled products.
7. manufacture method as claimed in claim 6 is characterized in that, the anneal condition after cold rolling is: 850-900 ℃, be incubated 1-3 minute.
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| CN103276300B (en) * | 2013-04-29 | 2015-11-25 | 宁波市博祥新材料科技有限公司 | A kind of copper-bearing antibacterial stainless steel and preparation method thereof |
| CN104087838B (en) * | 2014-07-03 | 2016-01-20 | 北京科技大学 | A kind of super-purity ferrite anti-bacteria stainless steel and manufacture method |
| CN107761008A (en) * | 2017-10-09 | 2018-03-06 | 上海前引科技有限公司 | A kind of antibacterial and mouldproof anion stainless steel and preparation method thereof |
| CN109457185A (en) * | 2018-12-06 | 2019-03-12 | 北京科技大学 | A kind of 430 ferrite antibacterial stainless steel of hot rolling and preparation method thereof |
| CN115608780B (en) * | 2022-12-19 | 2023-03-21 | 太原科技大学 | Method for controlling copper-containing stainless steel cracks and stainless steel |
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| CN101338402A (en) * | 2008-08-19 | 2009-01-07 | 山西太钢不锈钢股份有限公司 | Copper-containing ferrite antimicrobial stainless steel belt and method for manufacturing same |
| CN101353762A (en) * | 2007-07-23 | 2009-01-28 | 宝山钢铁股份有限公司 | Silver copper composite deep punch type ferrite antibiotic stainless steel, steel plate and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101353762A (en) * | 2007-07-23 | 2009-01-28 | 宝山钢铁股份有限公司 | Silver copper composite deep punch type ferrite antibiotic stainless steel, steel plate and manufacturing method thereof |
| CN101338402A (en) * | 2008-08-19 | 2009-01-07 | 山西太钢不锈钢股份有限公司 | Copper-containing ferrite antimicrobial stainless steel belt and method for manufacturing same |
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Effective date of registration: 20170215 Address after: 580 Baoshan District Changjiang Road, Shanghai, No. 200431 Patentee after: Baosteel Stainless Steel Co.,Ltd. Address before: 201900 Shanghai City, Mudanjiang Road No. 1813 South Patentee before: Baoshan Iron & Steel Co., Ltd. |
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Effective date of registration: 20190829 Address after: The Hong Kong Industrial Zone in Luoyuan Bay Development Zone of Luoyuan County of Fuzhou City, Fujian province 350600 Patentee after: Baosteel Desheng Stainless Steel Co., Ltd. Address before: 580 Baoshan District Changjiang Road, Shanghai, No. 200431 Patentee before: Baosteel Stainless Steel Co.,Ltd. |