CN113718180A - Ultralow carbon nitrogen ferrite stainless steel for household appliances and manufacturing method thereof - Google Patents
Ultralow carbon nitrogen ferrite stainless steel for household appliances and manufacturing method thereof Download PDFInfo
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- CN113718180A CN113718180A CN202111056800.1A CN202111056800A CN113718180A CN 113718180 A CN113718180 A CN 113718180A CN 202111056800 A CN202111056800 A CN 202111056800A CN 113718180 A CN113718180 A CN 113718180A
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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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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- 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
- 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
- C22C38/22—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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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Abstract
The invention relates to the technical field of ferrite stainless steel metallurgy, in particular to an ultra-low carbon nitrogen ferrite stainless steel for household appliances and a manufacturing method thereof, wherein the stainless steel manufactured by adopting the manufacturing method of the ultra-low carbon nitrogen ferrite stainless steel effectively improves the corrosion resistance and the formability of the stainless steel for the household appliances, reduces the conflict between the corrosion resistance and the formability of the ferrite stainless steel, meets the requirements of the steel for the household appliances, and further expands the application range of the ferrite stainless steel in the industry of the household appliances; comprises C, Si, Mn, Cr, N, Mo, Nb and Ti; wherein the finished stainless steel comprises the following chemical components: 0.005-0.02% of C, 0.30-0.60% of Si, 0.20-0.40% of Mn, 16.0-18.0% of Cr, 0.007-0.02% of N, 0.1-1% of Mo, 0-0.1% of Nb and 0.05-0.25% of Ti.
Description
Technical Field
The invention relates to the technical field of ferrite stainless steel metallurgy, in particular to ultra-low carbon nitrogen ferrite stainless steel for household appliances and a manufacturing method thereof.
Background
Ferritic stainless steel has wide application in the industries of household appliances and the like, and can be used for various household appliances such as microwave oven shells, washing machine inner barrels, electric rice cookers, electric water heater inner containers, electric water heating bottles and the like, kitchen and bathroom equipment such as dishwashers, ovens, cooking utensils, disinfection cupboards and the like, tableware and hardware products. China is a big country for producing household appliances, but at present, three-zero four-austenitic stainless steel and four-zero three-ferritic stainless steel are mainly used, and ferrite steel is mainly used in foreign countries such as the United states and Japan. Therefore, the ferritic stainless steel has huge use space in the household appliance industry in China. Compared with austenitic stainless steel, ferritic stainless steel has the defects of corrosion resistance and poor formability.
Disclosure of Invention
In order to solve the technical problems, the invention provides the ultra-low carbon nitrogen ferrite stainless steel for the household appliances and the manufacturing method thereof, which adopt the manufacturing method of the ultra-low carbon nitrogen ferrite stainless steel, effectively improve the corrosion resistance and the formability of the stainless steel for the household appliances, reduce the conflict between the corrosion resistance and the formability of the ferrite stainless steel, meet the requirements of the steel for the household appliances, and further expand the application range of the ferrite stainless steel in the industry of the household appliances.
The invention relates to an ultra-low carbon nitrogen ferrite stainless steel for household appliances and a manufacturing method thereof, which comprises C, Si, Mn, Cr, N, Mo, Nb and Ti;
wherein the finished stainless steel comprises the following chemical components: 0.005-0.02% of C, 0.30-0.60% of Si, 0.20-0.40% of Mn, 16.0-18.0% of Cr, 0.007-0.02% of N, 0.1-1% of Mo, 0-0.1% of Nb and 0.05-0.25% of Ti;
the specific manufacturing method comprises the following steps:
step 1, reducing the content of C, N and S, adding bistable elements Nb and Ti, and adding Mo less than or equal to 1%;
step 2, manufacturing the stainless steel through the steps of casting, hot rolling, annealing pickling, cold rolling, annealing pickling and the like, wherein the annealing temperature adopts thermocalc software to calculate the precipitation temperature of sigma and x and M23C6 in the stainless steel with the components at high temperature in a matrix;
step 3, cooling the stainless steel by air cooling;
and 4, cutting and polishing the finished stainless steel product to obtain the parts for the household appliance.
According to the ultralow carbon nitrogen ferrite stainless steel for household appliances and the manufacturing method thereof, Nb and Ti can be respectively combined with C and N in the stainless steel; by combining Nb and Ti with C and N in stainless steel, respectively, carbonitride of Nb and Ti is formed, suppressing the formation of carbonitride of chromium in stainless steel while avoiding the precipitation of other precipitated phases such as M23C6 and ultra low carbonitride phases, thereby improving the corrosion resistance of stainless steel.
The invention relates to a super low carbon nitrogen ferrite stainless steel for household appliances and a manufacturing method thereof, wherein N and Ti are combined to form TiN, and precipitates with the particle size of 0.15 mu m or more except TiN in the stainless steel are distributed in a steel matrix according to the proportion of 5000-50000/mm 2; thereby improving the hardness and the thermal shock resistance of the stainless steel.
The invention relates to an ultralow carbon nitrogen ferrite stainless steel for household appliances and a manufacturing method thereof, wherein the stainless steel can be smelted by utilizing the existing stainless steel production line and an electric furnace-AOD-VOD three-step method; thereby improving the convenience of the stainless steel refining.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts the manufacturing method of the ultra-low carbon nitrogen ferritic stainless steel, effectively improves the corrosion resistance and the formability of the stainless steel for household appliances, reduces the conflict between the corrosion resistance and the formability of the ferritic stainless steel, meets the requirements of the steel for the household appliances, and further expands the application range of the ferritic stainless steel in the industry of the household appliances.
Drawings
FIG. 1 is a schematic diagram comparing the present invention with the prior art patent;
FIG. 2 is a schematic view of a heat treatment regime of the present invention;
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 2, the ultra-low carbon nitrogen ferritic stainless steel for home appliances of the present invention and the method for manufacturing the same includes C, Si, Mn, Cr, N, Mo, Nb, and Ti;
wherein the finished stainless steel comprises the following chemical components: 0.005-0.02% of C, 0.30-0.60% of Si, 0.20-0.40% of Mn, 16.0-18.0% of Cr, 0.007-0.02% of N, 0.1-1% of Mo, 0-0.1% of Nb and 0.05-0.25% of Ti;
the specific manufacturing method comprises the following steps:
step 1, reducing the content of C, N and S, adding bistable elements Nb and Ti, and adding Mo less than or equal to 1%;
step 2, manufacturing the stainless steel through the steps of casting, hot rolling, annealing pickling, cold rolling, annealing pickling and the like, wherein the annealing temperature adopts thermocalc software to calculate the precipitation temperature of sigma and x and M23C6 in the stainless steel with the components at high temperature in a matrix;
step 3, cooling the stainless steel by air cooling;
step 4, cutting and polishing the finished stainless steel to obtain parts for household appliances;
the invention adopts the manufacturing method of the ultra-low carbon nitrogen ferritic stainless steel, effectively improves the corrosion resistance and the formability of the stainless steel for household appliances, reduces the conflict between the corrosion resistance and the formability of the ferritic stainless steel, meets the requirements of the steel for the household appliances, and further expands the application range of the ferritic stainless steel in the industry of the household appliances.
The invention relates to an ultra-low carbon nitrogen ferrite stainless steel for household appliances and a manufacturing method thereof, and the components and process embodiments and comparative examples are as follows:
comparison product:
1. chinese patent CN1572895 discloses a ferritic stainless steel plate with excellent formability and a production method thereof, wherein the steel comprises the following components (by weight percent): c up to 0.02 mass%, Si up to 0.8 mass%, Mn up to 1.5 mass%, P up to 0.050 mass%, S up to 0.01 mass%, Cr up to 8.0-35.0 mass%, N up to 0.05 mass%, Ti up to 0.05-0.40 mass%, and Nb up to 0.10-0.50 mass%, with the product (% Ti x% N) being less than 0.005 the steel being hot-rolled in a slab at an end point temperature of 800 ℃ or less, annealing the hot-rolled stainless steel sheet in the range of 450 ℃ + 1080 ℃, cold-rolling the hot-rolled steel sheet while accompanied by at least one intermediate annealing step of formability at a temperature between-100 ℃ and the recrystallization end point temperature, and then finish annealing the cold-rolled steel sheet at a temperature of 1080 ℃ or less, precipitates having a grain size of 0.15 μm or more in the steel matrix other than TiN being distributed in the proportion of 50000/2, however, the problem of how to improve corrosion resistance but reduce formability after Mo is added is not solved;
2. japanese patent JP2004307901 discloses an ultra-low carbon nitrogen ferrite stainless steel with excellent producibility and a production method thereof, wherein the steel comprises proper C, N, Si, Mn, P, S, Cr, Cu, Ni, Mo, Al and Ti, and the grain size of a final product is 7-10 grade by controlling the content of elements to meet a certain formula to reduce the generation of a steel precipitated phase and improve the performance of steel products, but noble metals such as Cu and Ni increase the production cost of the stainless steel;
3. compared with the prior common medium-chromium ferritic stainless steel SUS430 on the market, the invention has the advantages that Mo is added, sigma, chi and M23C6 are controlled to be precipitated in the matrix, the carbon and nitrogen content is strictly controlled, so that the plasticity, the formability, the corrosion resistance and the like of the stainless steel SUS430 are superior to those of the SUS430, compared with the commercially available 00Cr18Mo2Ti, the corrosion resistance of the stainless steel SUS is inferior, but sigma, chi and M23C6 are controlled in the matrix, the plasticity and the formability are greatly superior, and the alloy cost is greatly lower than that of the commercially available 00Cr18Mo2 Ti;
4. compared with Li CN1572895, the maximum of 1 percent of Mo is added, the precipitation temperature of M23C6, sigma and other ultra-low carbon and nitrogen precipitation phases in the sufficient system is calculated by utilizing thermo-calc software, and the temperature is used as the guide temperature of annealing treatment, so that the precipitation tendency of the M23C6 and the ultra-low carbon and nitrogen precipitation phases is reduced to the maximum extent, and finally, the steel seed matrix is quite dry and static, and has excellent formability and corrosion resistance in 6-7 grades;
and (4) comparing and concluding: the ultralow carbon nitrogen ferrite stainless steel for the household appliances and the manufacturing method thereof are obviously superior to comparison products in comparison in many aspects, and the manufacturing cost is lower.
As shown in figure 2, the highest value of the precipitation temperature of three precipitated phases is x ℃, the actual hot rolling annealing temperature is 50-100 ℃ above the highest theoretical temperature x ℃, the annealing time is 2-4 min, the actual cold rolling annealing temperature is 100-150 ℃ above the highest theoretical temperature x ℃, and the annealing time is 1-2 min.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. The ultra-low carbon nitrogen ferrite stainless steel for the household appliances and the manufacturing method thereof are characterized by comprising C, Si, Mn, Cr, N, Mo, Nb and Ti;
wherein the finished stainless steel comprises the following chemical components: 0.005-0.02% of C, 0.30-0.60% of Si, 0.20-0.40% of Mn, 16.0-18.0% of Cr, 0.007-0.02% of N, 0.1-1% of Mo, 0-0.1% of Nb and 0.05-0.25% of Ti;
the specific manufacturing method comprises the following steps:
step 1, reducing the content of C, N and S, adding bistable elements Nb and Ti, and adding Mo less than or equal to 1%;
step 2, manufacturing the stainless steel through the steps of casting, hot rolling, annealing pickling, cold rolling, annealing pickling and the like, wherein the annealing temperature adopts thermocalc software to calculate the precipitation temperature of sigma and x and M23C6 in the stainless steel with the components at high temperature in a matrix;
step 3, cooling the stainless steel by air cooling;
and 4, cutting and polishing the finished stainless steel product to obtain the parts for the household appliance.
2. The ultra-low carbon nitrogen ferritic stainless steel for home appliances according to claim 1, wherein Nb and Ti are respectively combined with C and N in the present stainless steel, and the method for manufacturing the same.
3. The ultra-low carbon nitrogen ferritic stainless steel for electric appliances and the manufacturing method thereof as set forth in claim 1, wherein N and Ti are combined to form TiN, and precipitates having a particle size of 0.15 μm or more other than TiN are distributed in a matrix of the steel in a ratio of 5000-50000/mm 2.
4. The ultra-low carbon nitrogen ferritic stainless steel for home appliances and the manufacturing method thereof as claimed in claim 1, wherein the stainless steel can be smelted by the existing stainless steel production line, electric furnace-AOD-VOD three-step method.
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| CN202111056800.1A CN113718180A (en) | 2021-09-09 | 2021-09-09 | Ultralow carbon nitrogen ferrite stainless steel for household appliances and manufacturing method thereof |
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| CN202111056800.1A CN113718180A (en) | 2021-09-09 | 2021-09-09 | Ultralow carbon nitrogen ferrite stainless steel for household appliances and manufacturing method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812641A (en) * | 2009-02-25 | 2010-08-25 | 宝山钢铁股份有限公司 | Ferrite stainless steel and manufacturing method thereof |
| US20120241052A1 (en) * | 2011-03-25 | 2012-09-27 | Posco | Ferritic stainless steel and method of manufacturing the same |
| CN103215524A (en) * | 2013-03-28 | 2013-07-24 | 宝钢不锈钢有限公司 | Stainless steel welded pipe with excellent pipe processability and manufacturing method thereof |
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- 2021-09-09 CN CN202111056800.1A patent/CN113718180A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812641A (en) * | 2009-02-25 | 2010-08-25 | 宝山钢铁股份有限公司 | Ferrite stainless steel and manufacturing method thereof |
| US20120241052A1 (en) * | 2011-03-25 | 2012-09-27 | Posco | Ferritic stainless steel and method of manufacturing the same |
| CN103215524A (en) * | 2013-03-28 | 2013-07-24 | 宝钢不锈钢有限公司 | Stainless steel welded pipe with excellent pipe processability and manufacturing method thereof |
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Application publication date: 20211130 |