CN109652625B - Manufacturing process of ultrahigh-strength cold-rolled steel plate for automobile window - Google Patents
Manufacturing process of ultrahigh-strength cold-rolled steel plate for automobile window Download PDFInfo
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- CN109652625B CN109652625B CN201910036896.1A CN201910036896A CN109652625B CN 109652625 B CN109652625 B CN 109652625B CN 201910036896 A CN201910036896 A CN 201910036896A CN 109652625 B CN109652625 B CN 109652625B
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
Abstract
The invention discloses a manufacturing process of an ultrahigh-strength cold-rolled steel plate for an automobile window, which comprises the following steps: sequentially carrying out heating and hot rolling procedures on a steel plate base material, and then carrying out cold rolling procedures to obtain a cold-rolled steel plate; the prepared cold-rolled steel plate is subjected to heat preservation at 780-880 ℃, is cooled to 700-750 ℃ at the speed of 10-30 ℃/s, is cooled to 550-640 ℃ at the speed of 60-200 ℃/s, and is cooled to below 100 ℃ at the cooling speed of more than 500 ℃/s; heating the processed cold-rolled steel plate to 150-250 ℃, tempering for 60-300 s, and then carrying out acid pickling treatment by weak acid; and (4) flattening the processed cold-rolled steel plate to obtain the ultrahigh-strength cold-rolled steel plate. The ultrahigh-strength cold-rolled steel plate manufactured by the process has the advantages of saving shape correction cost, higher yield strength, tensile strength, sufficient flatness and the like, and is also beneficial to improving the manufacturability, the dimensional accuracy and other qualities when the automobile window is manufactured.
Description
Technical Field
The invention relates to the field of cold-rolled steel sheets, in particular to a manufacturing process of an ultrahigh-strength cold-rolled steel sheet for automobile windows.
Background
The cold rolling is formed by rolling a hot rolled coil serving as a raw material at a temperature below the recrystallization temperature, and the cold rolled steel sheet is a steel sheet produced by a cold rolling process and is called a cold plate for short. The thickness of the cold-rolled plate is generally between 0.1 and 8.0mm, the thickness of the cold-rolled steel plate produced by most factories is below 4.5mm, and the thickness and the width of the cold-rolled plate are determined according to the equipment capacity and market demand of each factory.
Cold rolled steel sheets are used in a wide variety of applications, such as automotive manufacturing, electrical products, rolling stock, aviation, precision instruments, food cans, and the like. At present, the main development direction of automobiles increasingly pays more attention to energy conservation and safety. Therefore, while the fuel consumption is being increased, the weight reduction of the automobile body is actively required. The best way to reduce the vehicle weight is to use high-strength steel plates, thereby reducing the thickness of the steel plates. On the other hand, the adoption of the high-strength steel plate can also improve the dent resistance and the impact strength of the automobile, and prolong the service life and the safety of the automobile.
However, the demand for weight reduction of vehicle bodies is being further strengthened, and it is being studied to further reduce the weight of vehicle bodies by using a steel sheet having a higher strength than 1180MPa class. In general, as a method for improving the strength of a steel sheet, it is effective to include a martensite phase in a metal structure, and in particular, it is effective to make the metal structure a martensite single phase in order to achieve high strength with a small amount of addition of alloy components. Moreover, the martensite single-phase structure steel plate can save alloy components.
Meanwhile, many of the existing technologies for manufacturing cold-rolled steel sheets for automobile windows do not consider the influence of the steel sheet structure on the mechanical properties such as stretch flangeability. Among these, a high-strength steel sheet having a tensile strength of 1320MPa or more requires an extremely high rolling load, and a sufficient shape correcting effect cannot be obtained with conventional rolling equipment. In addition, the surface of the existing cold-rolled steel plate is easy to corrode, and the automobile window is used outside an automobile, is easily influenced by the external environment and has short service life.
Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a process for producing an ultra-high strength cold rolled steel sheet for automobile windows, which does not require straightening and reforming, and has high flatness, by selecting a steel sheet base material having a reasonable composition ratio and suppressing the deterioration of the shape of the steel sheet itself during quenching in continuous annealing.
Disclosure of Invention
The present inventors have made extensive studies to solve the above-mentioned problems of the prior art. The invention provides a manufacturing process of an ultrahigh-strength cold-rolled steel plate for an automobile window, which does not need correction and reforming and has flatness, tensile resistance and high yield.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a manufacturing process of an ultrahigh-strength cold-rolled steel plate for an automobile window, which comprises the following steps:
(1) sequentially carrying out heating and hot rolling procedures on a steel plate base material to obtain a hot-rolled steel plate;
(2) performing cold rolling treatment on the hot-rolled steel plate prepared in the step (1) to prepare a cold-rolled steel plate;
(3) preserving the heat of the cold-rolled steel plate prepared in the step (2) at 780-880 ℃, cooling to 700-750 ℃ at the speed of 10-30 ℃/s, then cooling to 550-640 ℃ at the speed of 60-200 ℃/s, and then cooling to below 100 ℃ at the cooling speed of more than 500 ℃/s;
(4) heating the cold-rolled steel plate treated in the step (3) to 150-250 ℃, tempering for 60-300 s, and then carrying out acid pickling treatment by using weak acid;
(5) and (4) flattening the cold-rolled steel plate treated in the step (4) to obtain the ultrahigh-strength cold-rolled steel plate.
Preferably, the steel plate base material in the step (1) comprises the following components in percentage by weight: 0.05-0.40% of C, less than or equal to 2.0% of Si, 1.0-3.0% of Mn, less than or equal to 0.05% of P, less than or equal to 0.02% of S, less than or equal to 0.1% of Ti, less than or equal to 0.20% of Nb, 0.01-0.05% of Al, less than or equal to 0.005% of N, and the balance of Fe and inevitable impurities.
Preferably, the steel plate base material in the step (1) comprises the following components in percentage by weight: 0.05 to 0.40% of C, 1.0 to 2.0% of Si, 1.5 to 3.0% of Mn, 0.01 to 0.04% of P, 0.010 to 0.015% of S, 0.02 to 0.08% of Ti, 0.1 to 0.2% of Nb, 0.02 to 0.05% of Al, 0.001 to 0.005% of N, and the balance of Fe and inevitable impurities.
Preferably, the hot rolling process in the step (1) is as follows: the finishing temperature is 830-930 ℃, and the coiling temperature is 550-650 ℃.
Preferably, the reduction ratio of the cold rolling treatment in the step (2) is 60 to 80%.
Preferably, the compression rate of the flattening treatment of the cold-rolled steel sheet in the step (5) is 0 to 0.6%.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
the present invention relates to a manufacturing process of an ultra-high strength cold rolled steel sheet for automobile windows, which can be applied to an ultra-high strength steel sheet having a tensile strength of 1320MPa or more, which is not easily subjected to shape correction, and which has a reasonable composition ratio that contributes to improvement of manufacturability in a continuous annealing process or the like, and which is extremely useful for reduction of cost for shape correction by surface finishing or the like. Further, the present invention can stably obtain an ultra-high strength cold rolled steel sheet having sufficient flatness by suppressing the shape deterioration itself of the steel sheet during quenching in the continuous annealing process.
Detailed Description
The present invention will be described in detail and specifically with reference to the following examples to facilitate better understanding of the present invention, but the following examples do not limit the scope of the present invention.
Example 1
The steel plate base material in the embodiment comprises the following components in percentage by weight: c: 0.3%, Si: 1.6%, Mn: 2.3%, P: 0.02%, S: 0.012%, Ti: 0.07%, Nb: 0.16%, Al: 0.03%, N: 0.004%, Cu: 0.16%, and the balance of Fe and inevitable impurities.
In the embodiment, the manufacturing process of the ultrahigh-strength cold-rolled steel plate for the automobile window comprises the following steps of:
(1) sequentially carrying out heating and hot rolling procedures on a steel plate base material to obtain a hot-rolled steel plate; wherein the finishing temperature is 860 ℃ and the coiling temperature is 610 ℃;
(2) performing cold rolling treatment on the hot-rolled steel plate prepared in the step (1) at a reduction rate of 68% to prepare a cold-rolled steel plate;
(3) keeping the temperature of the cold-rolled steel plate prepared in the step (2) at 820 ℃, cooling to 735 ℃ at the speed of 16 ℃/s, then cooling to 600 ℃ at the speed of 130 ℃/s, and then cooling to 90 ℃ at the cooling speed of 570 ℃/s;
(4) heating the cold-rolled steel plate treated in the step (3) to 200 ℃, tempering for 130s, and then carrying out acid pickling treatment by using weak acid;
(5) and (4) flattening the cold-rolled steel plate processed in the step (4) with the compression rate of 0.28% to obtain the ultrahigh-strength cold-rolled steel plate.
Example 2
The steel plate base material in the embodiment comprises the following components in percentage by weight: 0.35%, Si: 1.8%, Mn: 1.8%, P: 0.03%, S: 0.012%, Ti: 0.05%, Nb: 0.13%, Al: 0.04%, N: 0.003%, Cu: 0.18%, and the balance of Fe and inevitable impurities.
In the embodiment, the manufacturing process of the ultrahigh-strength cold-rolled steel plate for the automobile window comprises the following steps of:
(1) sequentially carrying out heating and hot rolling procedures on a steel plate base material to obtain a hot-rolled steel plate; wherein the finishing temperature is 880 ℃, and the coiling temperature is 640 ℃;
(2) performing cold rolling treatment on the hot-rolled steel plate prepared in the step (1) at a reduction rate of 74% to prepare a cold-rolled steel plate;
(3) keeping the temperature of the cold-rolled steel plate prepared in the step (2) at 840 ℃, cooling the cold-rolled steel plate to 720 ℃ at the speed of 18 ℃/s, then cooling the cold-rolled steel plate to 580 ℃ at the speed of 155 ℃/s, and then cooling the cold-rolled steel plate to 80 ℃ at the cooling speed of 610 ℃/s;
(4) heating the cold-rolled steel plate treated in the step (3) to 210 ℃, tempering for 150s, and then carrying out acid pickling treatment by using weak acid;
(5) and (4) flattening the cold-rolled steel plate processed in the step (4) with the compression rate of 0.23% to obtain the ultrahigh-strength cold-rolled steel plate.
Example 3
The steel plate base material in the embodiment comprises the following components in percentage by weight: 0.32%, Si: 1.5%, Mn: 2.0%, P: 0.03%, S: 0.013%, Ti: 0.06%, Nb: 0.17%, Al: 0.03%, N: 0.004%, Cu: 0.15%, and the balance of Fe and inevitable impurities.
In the embodiment, the manufacturing process of the ultrahigh-strength cold-rolled steel plate for the automobile window comprises the following steps of:
(1) sequentially carrying out heating and hot rolling procedures on a steel plate base material to obtain a hot-rolled steel plate; wherein the finishing temperature is 900 ℃, and the coiling temperature is 580 ℃;
(2) performing cold rolling treatment on the hot-rolled steel plate prepared in the step (1) at a reduction rate of 70% to prepare a cold-rolled steel plate;
(3) keeping the temperature of the cold-rolled steel plate prepared in the step (2) at 830 ℃, cooling the cold-rolled steel plate to 710 ℃ at the speed of 23 ℃/s, then cooling the cold-rolled steel plate to 620 ℃ at the speed of 100 ℃/s, and then cooling the cold-rolled steel plate to 85 ℃ at the cooling speed of 530 ℃/s;
(4) heating the cold-rolled steel plate treated in the step (3) to 180 ℃, tempering for 200s, and then carrying out acid pickling treatment by weak acid;
(5) and (4) flattening the cold-rolled steel plate processed in the step (4) with the compression rate of 0.20% to obtain the ultrahigh-strength cold-rolled steel plate.
The cold-rolled steel sheets prepared in examples 1, 2 and 3 were subjected to performance tests for tensile strength, yield strength and elongation. Specific data are shown in table 1.
Table 1 table of performance test data of example 1, example 2 and example 3
The comparative examples in table 1 are chinese invention patent (CN 201110418923.5): an ultrahigh-strength cold-rolled steel plate for automobiles and a production method thereof. As shown in the data of Table 1, the ultra-high strength cold rolled steel sheets manufactured in examples 1 to 3 according to the present invention have higher yield strength, tensile strength and elongation than those of the steel sheets manufactured in comparative examples.
In summary, the present invention has advantages of saving the cost of shape correction, higher strength, sufficient flatness, etc., and contributes to improvement of the manufacturability and improvement of the quality such as dimensional accuracy when manufacturing the triangular window molding for an automobile.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (2)
1. The manufacturing process of the ultrahigh-strength cold-rolled steel plate for the automobile window is characterized by comprising the following steps of:
(1) sequentially carrying out heating and hot rolling on the steel plate base material, wherein the finish rolling temperature is 830-930 ℃, and the coiling temperature is 550-650 ℃ to obtain a hot rolled steel plate;
(2) performing cold rolling treatment on the hot-rolled steel plate prepared in the step (1) to obtain a cold-rolled steel plate, wherein the reduction rate is 60-80%;
(3) preserving the heat of the cold-rolled steel plate prepared in the step (2) at 780-880 ℃, cooling to 700-750 ℃ at the speed of 10-30 ℃/s, then cooling to 550-640 ℃ at the speed of 60-200 ℃/s, and then cooling to below 100 ℃ at the cooling speed of more than 500 ℃/s;
(4) heating the cold-rolled steel plate treated in the step (3) to 150-250 ℃, tempering for 60-300 s, and then carrying out acid pickling treatment by using weak acid;
(5) flattening the cold-rolled steel plate treated in the step (4) to obtain an ultrahigh-strength cold-rolled steel plate, wherein the compression rate is 0-0.6%;
the steel plate base material in the step (1) comprises the following components in percentage by weight: 0.05-0.40% of C, less than or equal to 2.0% of Si, 1.0-3.0% of Mn, less than or equal to 0.05% of P, less than or equal to 0.02% of S, less than or equal to 0.1% of Ti, less than or equal to 0.20% of Nb, 0.01-0.05% of Al, less than or equal to 0.005% of N, and the balance of Fe and inevitable impurities.
2. The manufacturing process of the ultra-high strength cold rolled steel sheet for the automobile window according to claim 1, wherein the steel sheet substrate in the step (1) comprises the following components in percentage by weight: 0.05 to 0.40% of C, 1.0 to 2.0% of Si, 1.5 to 3.0% of Mn, 0.01 to 0.04% of P, 0.010 to 0.015% of S, 0.02 to 0.08% of Ti, 0.1 to 0.2% of Nb, 0.02 to 0.05% of Al, 0.001 to 0.005% of N, and the balance of Fe and inevitable impurities.
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| CN111518997A (en) * | 2020-06-01 | 2020-08-11 | 宁波瑞国精机工业有限公司 | Machining process of anti-skid flange nut |
| CN113201694B (en) * | 2021-04-09 | 2022-06-10 | 唐山钢铁集团有限责任公司 | Production method of cold-rolled low-carbon steel with high corrosion resistance |
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| WO2002022904A1 (en) * | 2000-09-12 | 2002-03-21 | Nkk Corporation | Super high tensile cold-rolled steel plate and method for production thereof |
| JP4947176B2 (en) * | 2010-03-24 | 2012-06-06 | Ｊｆｅスチール株式会社 | Manufacturing method of ultra-high strength cold-rolled steel sheet |
| CN102181790B (en) * | 2011-05-09 | 2013-04-03 | 武汉钢铁(集团)公司 | Steel with 1,300MPa-level tensile strength for automobile safety piece and production method thereof |
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