CN111945059A - Cold-rolled high-strength heat-resistant enamel steel - Google Patents
Cold-rolled high-strength heat-resistant enamel steel Download PDFInfo
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- CN111945059A CN111945059A CN202010650251.XA CN202010650251A CN111945059A CN 111945059 A CN111945059 A CN 111945059A CN 202010650251 A CN202010650251 A CN 202010650251A CN 111945059 A CN111945059 A CN 111945059A
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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
- 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
- C21D8/02—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
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention provides cold-rolled high-strength heat-resistant enamel steel which comprises the following chemical components in percentage by weight: c: 0.04 to 0.07 weight percent of Si, less than or equal to 0.03 weight percent of Mn, 0.40 to 0.80 weight percent of Mn, less than or equal to 0.025 weight percent of P, less than or equal to 0.020 weight percent of S, less than or equal to 0.030 weight percent of Alt, 0.15 to 0.40 weight percent of Cr, 0.05 to 0.15 weight percent of Mo, 0.004 to 0.010 weight percent of N, and the balance of Fe and inevitable trace elements. The cold-rolled high-strength heat-resistant enamel steel has small reduction of the yield strength and the tensile strength of the material after the enamel firing at 850 ℃.
Description
Technical Field
The invention relates to the field of steel rolling, in particular to cold-rolled high-strength heat-resistant enamel steel for manufacturing a water heater liner, namely cold-rolled high-strength heat-resistant enamel steel.
Background
The quality guarantee period of the inner container required by the industry of household appliance water heaters reaches more than 8 years, and as market competition is increasingly violent, manufacturers of inner containers of water heaters are forced to bear the pressure of production cost, light materials are required, the materials are thinned and still have the requirements of bearing certain pressure, preventing enamel from scaling explosion, resisting pulse fatigue and the like, so that the materials have high strength and certain forming performance, and the strength of the materials is required to be reduced less after the enameling at the high temperature of 850 ℃. However, when the existing cold-rolled enamel steel meets the requirements of scale explosion resistance and high strength, the strength of the material is greatly reduced after the cold-rolled enamel steel is subjected to enamel firing at a high temperature of 850 ℃.
In summary, the following problems exist in the prior art: when the prior cold-rolled enamel steel meets the requirements of scale explosion resistance and high strength, the strength of the material is greatly reduced after the enamel steel is subjected to high-temperature enamel firing at 850 ℃.
Disclosure of Invention
The invention provides cold-rolled high-strength heat-resistant enamel steel, which aims to solve the problem that the strength of a material is greatly reduced after the cold-rolled enamel steel is subjected to high-temperature enamel firing at 850 ℃.
Therefore, the invention provides cold-rolled high-strength heat-resistant enamel steel which comprises the following chemical components in percentage by weight: c: 0.04 to 0.07 weight percent of Si, less than or equal to 0.03 weight percent of Mn, 0.40 to 0.80 weight percent of Mn, less than or equal to 0.025 weight percent of P, less than or equal to 0.020 weight percent of S, less than or equal to 0.030 weight percent of Alt, 0.15 to 0.40 weight percent of Cr, 0.05 to 0.15 weight percent of Mo, 0.004 to 0.010 weight percent of N, and the balance of Fe and inevitable trace elements.
Further, the cold-rolled high-strength heat-resistant enamel steel comprises the following chemical components in percentage by weight: c: 0.04 wt%, Si: 0.02 wt%, Mn:0.55 wt%, P: 0.020 wt%, S: 0.015 wt%, Alt: 0.024 wt%, 0.30 wt% of Cr, 0.08 wt% of Mo, 0.006 wt% of N, and the balance of Fe and inevitable trace elements.
Further, the cold-rolled high-strength heat-resistant enamel steel comprises the following chemical components in percentage by weight: c: 0.03 wt%, Si: 0.01 wt%, Mn:0.80 wt%, P: 0.015 wt%, S: 0.010 wt%, Alt: 0.022 wt%, 0.35 wt% of Cr, 0.12 wt% of Mo, 0.008 wt% of N, and the balance of Fe and inevitable trace elements.
Further, the cold-rolled high-strength heat-resistant enamel steel comprises the following chemical components in percentage by weight: c: 0.04 wt%, Si: 0.01 wt%, Mn:0.60 wt%, P: 0.012 wt%, S: 0.012 wt%, Alt: 0.022 wt%, 0.28 wt% of Cr, 0.10 wt% of Mo, 0.006 wt% of N, and the balance of Fe and inevitable trace elements.
Further, the cold-rolled high-strength heat-resistant enamel steel comprises the following chemical components in percentage by weight: c: 0.05 wt%, Si: 0.02 wt%, Mn:0.70 wt%, P: 0.013 wt%, S: 0.016 wt%, Alt: 0.022 wt%, 0.36 wt% of Cr, 0.14 wt% of Mo, 0.005 wt% of N, and the balance of Fe and inevitable trace elements.
Further, the cold-rolled high-strength heat-resistant enamel steel comprises the following chemical components in percentage by weight: c: 0.06 wt%, Si: 0.02 wt%, Mn:0.65 wt%, P: 0.018 wt%, S: 0.015 wt%, Alt: 0.028 wt%, 0.33 wt% of Cr, 0.10 wt% of Mo, 0.008 wt% of N, and the balance of Fe and inevitable trace elements.
Further, after the cold-rolled high-strength heat-resistant enamel steel is subjected to enameling firing at 850 ℃, the yield strength is 331MPa, and the tensile strength is 425 MPa.
Further, after the cold-rolled high-strength heat-resistant enamel steel is subjected to enameling firing at 850 ℃, the yield strength is 350MPa, and the tensile strength is 454 MPa.
Further, after the cold-rolled high-strength heat-resistant enamel steel is subjected to enamel firing at 850 ℃, the yield strength is 342MPa, and the tensile strength is 439 MPa.
Further, after the enamel firing at 850 ℃, the yield strength of the cold-rolled high-strength heat-resistant enamel steel is 330MPa, and the yield tensile strength is 446 MPa.
The cold-rolled high-strength heat-resistant enamel steel ReL or R obtained by the inventionp0.2: 300 to 410MPa, tensile strength Rm: 420 to 500MPa, elongation A50mmNot less than 32 percent. According to the invention, through the optimized design of components and a production process, the strength of a product is improved, the material is thinned to 1.5mm by using the original 2.0mm cold-rolled enamel steel, and is thinned to 1.4mm by using the original 1.8mm cold-rolled enamel steel, so that the material has good formability, the requirement of manufacturing the liner for stamping is met, the yield strength and the tensile strength of the material after being subjected to enameling at 850 ℃ are reduced to be less than or equal to 30MPa (the strength of other cold-rolled high-strength enamel steel after being enameling is reduced to be more than 50MPa), the pulse fatigue life of the liner is more than 30 thousands of times, and the material has a high fish scaling-resistant sensitive TH value.
Detailed Description
The present invention will now be described in order to more clearly understand the technical features, objects, and effects of the present invention.
The process route of the invention is as follows: blast furnace molten iron smelting → molten iron desulphurization pretreatment → converter molten steel smelting → LF molten steel refining treatment → slab continuous casting → hot continuous rolling → acid pickling cold continuous rolling → cover annealing → leveling → inspection and packaging for warehousing;
argon is blown from the bottom in the whole smelting process, and molten steel is deoxidized in an LF furnace;
hot continuous rolling: controlling the heating temperature of the casting blank to be 1280 +/-30 ℃, keeping the temperature of the casting blank in the furnace for more than or equal to 150min, adopting a seven-stand hot continuous rolling mill, controlling the final rolling temperature to be 880-920 ℃, and controlling the coiling temperature to be 580-640 ℃.
Acid pickling and cold continuous rolling: the cold rolling relative reduction rate is more than or equal to 65 percent.
Cover type annealing process: the annealing heat preservation temperature is 660-700 ℃, the heating rate is less than or equal to 60 ℃/h, the heat preservation time is 8-10h, the cooling rate is controlled to be less than or equal to 30 ℃/h, the cooling is controlled to 380 ℃, and the tapping temperature is less than or equal to 80 ℃.
Leveling: the elongation was set to (1.50. + -. 0.20)%.
The production method of the cold-rolled high-strength heat-resistant enamel steel adopts the following component proportion and specific process. Wherein, Table 1 shows the compositions (in weight%) of the steels of the respective examples. Table 2 shows the process parameters corresponding to the example steels described in table 1. Table 3 shows the mechanical properties of the steel compositions described in the examples of Table 1. Table 4 shows the properties of each example after the enameling at 850 ℃.
Table 1: chemical composition (wt%) of product
Table 2: specific process parameters of the examples
Table 3: mechanical Properties of the Cold-rolled high-Strength Heat-resistant enameled steels obtained in examples (before enameling at 850 ℃ C.)
Table 4: the performance of the cold-rolled high-strength heat-resistant enameled steel obtained in each example after enameling at 850 DEG C
Strength reduction comparison before and after enameling at 850 ℃:
yield strength of example 1 decreased by 15MPa, rate of decrease: 4.39%;
tensile strength of example 1 decreased by 17MPa, rate of decrease: 3.84 percent;
yield strength of example 2 decreased by 18MPa, rate of decrease: 4.89%;
tensile strength of example 2 decreased by 26MPa, rate of decrease: 5.53%;
yield strength of example 3 decreased by 14MPa, rate of decrease: 3.91 percent;
tensile strength of example 3 decreased by 19MPa, rate of decrease: 4.14%;
yield strength of example 4 decreased by 14MPa, rate of decrease: 3.86 percent;
tensile strength of example 4 decreased by 15MPa, rate of decrease: 3.44%;
yield strength of example 5 decreased by 12MPa, rate of decrease: 3.50 percent;
tensile strength of example 5 decreased by 16MPa, rate of decrease: the content was found to be 3.46%.
Therefore, before and after the cold-rolled high-strength heat-resistant enamel steel disclosed by the invention is subjected to enamel firing at 850 ℃, the yield strength and the tensile strength are reduced by less than or equal to 30MPa, the reduction ratio is within 5%, and the reduction range is small.
The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. The cold-rolled high-strength heat-resistant enamel steel is characterized by comprising the following chemical components in percentage by weight: c: 0.04 to 0.07 weight percent of Si, less than or equal to 0.03 weight percent of Mn, 0.40 to 0.80 weight percent of Mn, less than or equal to 0.025 weight percent of P, less than or equal to 0.020 weight percent of S, less than or equal to 0.030 weight percent of Alt, 0.15 to 0.40 weight percent of Cr, 0.05 to 0.15 weight percent of Mo, 0.004 to 0.010 weight percent of N, and the balance of Fe and inevitable trace elements.
2. The cold-rolled high-strength heat-resistant enamel steel as claimed in claim 1, wherein the chemical components of the cold-rolled high-strength heat-resistant enamel steel are as follows by weight percent: c: 0.04 wt%, Si: 0.02 wt%, Mn:0.55 wt%, P: 0.020 wt%, S: 0.015 wt%, Alt: 0.024 wt%, 0.30 wt% of Cr, 0.08 wt% of Mo, 0.006 wt% of N, and the balance of Fe and inevitable trace elements.
3. The cold-rolled high-strength heat-resistant enamel steel as claimed in claim 1, wherein the chemical components of the cold-rolled high-strength heat-resistant enamel steel are as follows by weight percent: c: 0.03 wt%, Si: 0.01 wt%, Mn:0.80 wt%, P: 0.015 wt%, S: 0.010 wt%, Alt: 0.022 wt%, 0.35 wt% of Cr, 0.12 wt% of Mo, 0.008 wt% of N, and the balance of Fe and inevitable trace elements.
4. The cold-rolled high-strength heat-resistant enamel steel as claimed in claim 1, wherein the chemical components of the cold-rolled high-strength heat-resistant enamel steel are as follows by weight percent: c: 0.04 wt%, Si: 0.01 wt%, Mn:0.60 wt%, P: 0.012 wt%, S: 0.012 wt%, Alt: 0.022 wt%, 0.28 wt% of Cr, 0.10 wt% of Mo, 0.006 wt% of N, and the balance of Fe and inevitable trace elements.
5. The cold-rolled high-strength heat-resistant enamel steel as claimed in claim 1, wherein the chemical components of the cold-rolled high-strength heat-resistant enamel steel are as follows by weight percent: c: 0.05 wt%, Si: 0.02 wt%, Mn:0.70 wt%, P: 0.013 wt%, S: 0.016 wt%, Alt: 0.022 wt%, 0.36 wt% of Cr, 0.14 wt% of Mo, 0.005 wt% of N, and the balance of Fe and inevitable trace elements.
6. The cold-rolled high-strength heat-resistant enamel steel as claimed in claim 1, wherein the chemical components of the cold-rolled high-strength heat-resistant enamel steel are as follows by weight percent: c: 0.06 wt%, Si: 0.02 wt%, Mn:0.65 wt%, P: 0.018 wt%, S: 0.015 wt%, Alt: 0.028 wt%, 0.33 wt% of Cr, 0.10 wt% of Mo, 0.008 wt% of N, and the balance of Fe and inevitable trace elements.
7. The cold-rolled high-strength heat-resistant enameled steel according to claim 2, wherein the yield strength of the cold-rolled high-strength heat-resistant enameled steel after 850 ℃ enameling is 331Mpa and the tensile strength is 425 Mpa.
8. The cold-rolled high-strength heat-resistant enameled steel according to claim 3, wherein the yield strength of the cold-rolled high-strength heat-resistant enameled steel after 850 ℃ enameling is 350MPa and the tensile strength is 454 MPa.
9. The cold-rolled high-strength heat-resistant enamel steel as set forth in claim 4, wherein the yield strength of the cold-rolled high-strength heat-resistant enamel steel after the enameling at 850 ℃ is 342MPa and the tensile strength thereof is 439 MPa.
10. The cold-rolled high-strength heat-resistant enameled steel according to claim 5, wherein the yield strength of the cold-rolled high-strength heat-resistant enameled steel after 850 ℃ enameling is 330MPa and the tensile strength is 446 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010650251.XA CN111945059A (en) | 2020-07-08 | 2020-07-08 | Cold-rolled high-strength heat-resistant enamel steel |
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| CN202010650251.XA CN111945059A (en) | 2020-07-08 | 2020-07-08 | Cold-rolled high-strength heat-resistant enamel steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114395688A (en) * | 2021-12-09 | 2022-04-26 | 安阳钢铁集团有限责任公司 | Production process of low-carbon enamel steel |
Citations (5)
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| CN102251192A (en) * | 2010-05-19 | 2011-11-23 | 宝山钢铁股份有限公司 | Enamel steel and production method thereof |
| CN103510011A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | High strength steel plate used for enamel liners and manufacturing method thereof |
| KR20150074891A (en) * | 2013-12-24 | 2015-07-02 | 주식회사 포스코 | Method for manufacturing enamel steel |
| CN108588559A (en) * | 2018-05-17 | 2018-09-28 | 柳州钢铁股份有限公司 | The cold rolling glassed steel of yield strength 230MPa or more |
| CN108754343A (en) * | 2018-06-26 | 2018-11-06 | 武汉钢铁有限公司 | 450MPa grades of automobile exterior panels zn-fe alloy coating dual phase sheet steel and its manufacturing methods |
-
2020
- 2020-07-08 CN CN202010650251.XA patent/CN111945059A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251192A (en) * | 2010-05-19 | 2011-11-23 | 宝山钢铁股份有限公司 | Enamel steel and production method thereof |
| CN103510011A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | High strength steel plate used for enamel liners and manufacturing method thereof |
| KR20150074891A (en) * | 2013-12-24 | 2015-07-02 | 주식회사 포스코 | Method for manufacturing enamel steel |
| CN108588559A (en) * | 2018-05-17 | 2018-09-28 | 柳州钢铁股份有限公司 | The cold rolling glassed steel of yield strength 230MPa or more |
| CN108754343A (en) * | 2018-06-26 | 2018-11-06 | 武汉钢铁有限公司 | 450MPa grades of automobile exterior panels zn-fe alloy coating dual phase sheet steel and its manufacturing methods |
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| 徐鹤贤等: "《冷轧窄带钢生产》", 31 August 1992 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114395688A (en) * | 2021-12-09 | 2022-04-26 | 安阳钢铁集团有限责任公司 | Production process of low-carbon enamel steel |
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