CN113403541A - 550 MPa-level low-alloy high-strength cold-rolled steel plate and production method thereof - Google Patents
550 MPa-level low-alloy high-strength cold-rolled steel plate and production method thereof Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 22
- 239000000956 alloy Substances 0.000 title claims abstract description 22
- 239000010960 cold rolled steel Substances 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 238000005096 rolling process Methods 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 238000000137 annealing Methods 0.000 claims abstract description 16
- 238000005097 cold rolling Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000005554 pickling Methods 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims description 7
- 238000010583 slow cooling Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 238000005728 strengthening Methods 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
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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
- 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
-
- 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
- C21D8/0236—Cold rolling
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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Abstract
The invention belongs to the technical field of cold-rolled plate strip production, and relates to a 550 MPa-level low-alloy high-strength cold-rolled steel plate and a production method thereof. The steel plate comprises, by mass, 0.050% -0.090% of C, 0.010% -0.20% of Si, 1.00% -1.30% of Mn, less than or equal to 0.020% of P, less than or equal to 0.012% of S, 0.03-0.08% of Nb, 0.02-0.05% of Ti, 0.020% -0.070% of Als, and the balance Fe and unavoidable impurities. The production method comprises the following steps: smelting to obtain molten steel, continuously casting the molten steel into a steel billet, and heating, roughly rolling, finely rolling, pickling, cooling, coiling, cold rolling and continuously annealing the steel billet to obtain the steel plate. The invention combines the alloy components with the process to prepare the steel plate with Rp0.2 of 550-650MPa, Rm of 610-750MPa and the elongation of more than or equal to 16.0 percent.
Description
Technical Field
The invention belongs to the technical field of cold-rolled plate strip production, and particularly relates to a 550 MPa-level low-alloy high-strength cold-rolled steel plate and a production method thereof.
Background
With the development of the automobile industry, the automobile holding capacity is increased, and three problems of energy consumption, environmental emission and safety are caused while convenience is brought to people for going out. A large number of experiments show that the light weight of the automobile is an important means for energy conservation and emission reduction of the automobile, and the weight of the passenger car is reduced by 10 percent, the oil can be saved by 6 to 8 percent, and the emission is reduced by 4 percent. The weight reduction of automobiles requires lightweight materials on the one hand and high-strength materials on the other hand.
The production process of the cold-rolled high-strength steel mainly comprises the following steps: the method has the advantages that firstly, the low-carbon low-alloy composition design is adopted, the process of incomplete annealing is carried out after cold rolling strengthening, the cold rolling work hardening is fully utilized, the method is suitable for products with low requirements on material plasticity, the process is simple, and the production cost is low; secondly, through C, Mn solid solution strengthening, the material strength is obviously reduced during annealing under the composition, and the method is suitable for product design with relatively low strength; thirdly, microalloy strengthening is performed, two-phase particles are formed to obtain stable refined original grains, and then a certain cold rolling annealing process is combined, the design is most common at present, but microalloy such as Nb, Ti, Cr and the like has high price and insufficient economy.
Disclosure of Invention
The invention aims to provide a 550 MPa-level low-alloy high-strength cold-rolled steel plate and a production method thereof.
The invention firstly provides a 550 MPa-level low-alloy high-strength cold-rolled steel plate, which comprises the following chemical components in percentage by mass: 0.050% -0.090% of C, 0.010% -0.20% of Si, 1.00% -1.30% of Mn, less than or equal to 0.020% of P, less than or equal to 0.012% of S, 0.03-0.08% of Nb, 0.02-0.05% of Ti, 0.020% -0.070% of Als, and the balance of Fe and inevitable impurities.
The invention also provides a production method of the 550 MPa-level low-alloy high-strength cold-rolled steel plate, which comprises the following steps: smelting to obtain molten steel with the chemical components, continuously casting the molten steel into a billet, and heating, roughly rolling, finely rolling, pickling, cooling, coiling, cold rolling and continuously annealing the billet to obtain the steel plate.
In the production method of the 550 MPa-level low-alloy high-strength cold-rolled steel plate, the heating temperature is 1220-1250 ℃. The heating time is 200-260 min.
In the production method of the 550 MPa-level low-alloy high-strength cold-rolled steel plate, the rough rolling adopts 5-pass rolling.
Further, in the production method of the 550 MPa-level low-alloy high-strength cold-rolled steel plate, the reduction rate of the first pass of rough rolling is 13-18%, and the reduction rate of the 2 nd to 5 th passes of rough rolling is 18-20%.
In the production method of the 550 MPa-level low-alloy high-strength cold-rolled steel plate, the rolling temperature of finish rolling is 1150-1190 ℃, and the finishing temperature is 850-900 ℃.
In the production method of the 550 MPa-level low-alloy high-strength cold-rolled steel plate, the coiling temperature is 550-600 ℃.
In the production method of the 550 MPa-grade low-alloy high-strength cold-rolled steel plate, the cold rolling reduction rate is 50-65%.
In the production method of the 550 MPa-grade low-alloy high-strength cold-rolled steel plate, the running speed of the strip steel during continuous annealing is 80-200 m/min, the annealing soaking temperature is 800-840 ℃, the slow cooling end point temperature is 650-680 ℃, the overaging temperature is 400-430 ℃, and the finishing elongation is 1.3-1.5%.
Compared with the prior art, the invention has the beneficial effects that:
the alloy components are combined with the process, and the mechanical property of the prepared finished product meets the requirements of yield strength of 550-650MPa, tensile strength of 610-750MPa and elongation of more than or equal to 16.0 percent.
Detailed Description
The invention provides a 550 MPa-level low-alloy high-strength cold-rolled steel plate which comprises the following chemical components in percentage by mass: 0.050% -0.090% of C, 0.010% -0.20% of Si, 1.00% -1.30% of Mn, less than or equal to 0.020% of P, less than or equal to 0.012% of S, 0.03-0.08% of Nb, 0.02-0.05% of Ti, 0.020% -0.070% of Als, and the balance of Fe and inevitable impurities.
The reasons for the selection of chemical compositions and ranges thereof in the present invention are as follows: the selection of the carbon content range mainly considers the matching of strength, formability and welding performance, if the carbon content is lower than 0.05 percent, the strength of the steel plate is low, more other strengthening alloy elements are required to be added to meet the requirement of high strength, and the design of low cost is not met; above 0.090%, the formability and weldability of the steel sheet are reduced, and the performance control at low strength level is not facilitated. The addition of small amounts of silicon and phosphorus provides a solid solution strengthening effect, and more importantly, purifies recrystallized ferrite, promotes pearlite transformation, and improves the anti-aging properties of the test steel. Mn is mainly in a solid solution strengthening mode to improve the strength and is combined with sulfur to form MnS, thereby preventing hot cracking caused by FeS, and the welding performance of steel is influenced due to the excessively high Mn content. S exists as a residual element and is controlled to be less than or equal to 0.012 percent. Aluminum is mainly added as a deoxidizing element, the content of the aluminum is required to be more than 0.010 percent to realize complete deoxidation, but the excessive aluminum influences the welding performance of steel and the control of casting blank inclusions, so the content of the aluminum is preferably selected to be 0.020 to 0.070 percent. The microalloy Ti is added to effectively fine grains and is combined with C, N elements to form a Ti (C, N) reinforced ferrite matrix so as to achieve the aim of high strength, and the microalloy Ti is designed to be 0.020-0.050% according to the requirement of the strength grade. The microalloy Nb is added to effectively fine grains by increasing the austenite recrystallization temperature, and is combined with C, N elements to form a Nb (C, N) reinforced ferrite matrix so as to achieve the aim of high strength, and the Nb is designed to be 0.030-0.080% according to the strength grade requirement.
The invention also provides a production method of the 550 MPa-level low-alloy high-strength cold-rolled steel plate, which comprises the following steps: smelting to obtain molten steel containing the chemical components, and continuously casting the molten steel into a continuous casting billet with the thickness of 220 +/-10 mm; heating the continuous casting slab to 1220-1250 ℃, wherein the in-furnace time is 200-260 min; carrying out rough rolling, wherein the rough rolling adopts 5-pass rolling, the first-pass reduction rate of the rough rolling is 13-18%, the 2 nd-5 th-pass reduction rate of the rough rolling is 18-20%, the total phosphorus removal is carried out, a heat preservation cover is used in the rolling process, and the thickness of a hot-rolled intermediate plate blank is 39-43 mm; the start rolling temperature of finish rolling is 1150-1190 ℃, and the finish rolling temperature range is 850-900 ℃; and after finish rolling, cooling the front section to 550-600 ℃ in a cooling mode, coiling, wherein the thickness of the hot rolled plate is 2.5-5.0 mm, after the hot rolled plate is cleaned by alkali washing, the cold rolling reduction rate is determined to be 50-65% by combining the capacity of a cold rolling mill, the running speed of the continuous annealing strip steel is controlled to be 80-200 m/min, the annealing soaking temperature is controlled to be 800-840 ℃, the slow cooling end point temperature is controlled to be 650-680 ℃, the overaging temperature is controlled to be 400-430 ℃, and the finishing elongation rate is controlled to be 1.3-1.5%.
The following examples are provided to further illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.
Examples
According to the conventional molten iron desulfurization, converter smelting and LF furnace treatment, the components of molten steel are controlled as shown in the following table 1, the molten steel is continuously cast into a continuous casting slab with the thickness of 230mm, the continuous casting slab is roughly rolled to obtain an intermediate slab with the thickness of 41mm, and a hot rolled plate with the thickness of 3.25mm is obtained through finish rolling, and the hot rolled plate is obtained through acid washing, cooling, coiling, cold rolling and continuous annealing.
TABLE 1 molten steel composition
| Numbering | C | Si | Mn | P | S | Nb | Ti | Als |
| Example 1 | 0.070 | 0.11 | 1.25 | 0.010 | 0.002 | 0.037 | 0.035 | 0.030 |
| Example 2 | 0.060 | 0.10 | 1.30 | 0.012 | 0.009 | 0.040 | 0.029 | 0.038 |
| Comparative example 1 | 0.06 | 0.07 | 0.66 | 0.014 | 0.007 | 0.016 | 0.028 | 0.035 |
| Comparative example 2 | 0.05 | 0.07 | 0.62 | 0.012 | 0.006 | 0.014 | 0.025 | 0.032 |
(1) The hot rolling process parameters are shown in table 2 below:
TABLE 2 Hot Rolling Main Process parameters
| Numbering | Heating temperature/. degree.C | Finish rolling temperature/. degree.C | Final Rolling temperature/. degree.C | Coiling temperature/. degree.C |
| Example 1 | 1230 | 1160 | 868 | 580 |
| Example 2 | 1226 | 1152 | 871 | 579 |
| Comparative example 1 | 1233 | 1135 | 935 | 755 |
| Comparative example 2 | 1238 | 1136 | 935 | 746 |
(2) And pickling the hot rolled coil, and cold rolling the hot rolled coil into thin strip steel, wherein the cold rolling reduction rate is 53.8 percent respectively.
(3) The continuous annealing process parameters are shown in table 3:
TABLE 3 continuous annealing Main Process parameters
| Numbering | Annealing temperature/. degree.C | Slow cooling end point temperature/. degree.C | Overaging temperature/. degree C | Percent of the finished elongation |
| Example 1 | 823 | 680 | 428 | 1.43 |
| Example 2 | 821 | 675 | 423 | 1.50 |
| Comparative example 1 | 828 | 636 | 400 | 1.40 |
| Comparative example 2 | 830 | 638 | 400 | 1.35 |
(4) The mechanical properties of the steel sheets prepared by the above process are shown in table 4 below.
TABLE 4 mechanical Properties of Cold-rolled Steel sheets
| Numbering | Thickness/mm | Rp0.2/MPa | Rm/MPa | Elongation A80/％ |
| Example 1 | 1.5 | 578 | 629 | 18.0 |
| Example 2 | 1.5 | 583 | 631 | 17.5 |
| Comparative example 1 | 1.5 | 470 | 598 | 16.0 |
| Comparative example 2 | 1.5 | 4675 | 596 | 15.0 |
Claims (8)
- The 1.550 MPa-level low-alloy high-strength cold-rolled steel plate is characterized in that: the steel plate comprises the following chemical components in percentage by mass: 0.050% -0.090% of C, 0.010% -0.20% of Si, 1.00% -1.30% of Mn, less than or equal to 0.020% of P, less than or equal to 0.012% of S, 0.03-0.08% of Nb, 0.02-0.05% of Ti, 0.020% -0.070% of Als, and the balance of Fe and inevitable impurities.
- 2. The method for producing the 550MPa grade low alloy high strength cold rolled steel plate as claimed in claim 1, wherein: the method comprises the following steps: smelting to obtain molten steel with the chemical components, continuously casting the molten steel into a steel billet, and heating, roughly rolling, finely rolling, pickling, cooling, coiling, cold rolling and continuously annealing the steel billet to obtain the steel plate.
- 3. The production method according to claim 2, characterized in that: the heating temperature is 1220-1250 ℃, and the heating time is 200-260 min.
- 4. The production method according to claim 2, characterized in that: the rough rolling adopts 5 passes of rolling; further, the first pass reduction rate of rough rolling is 13-18%, and the second pass reduction rate of rough rolling is 18-20%.
- 5. The production method according to claim 2, characterized in that: the start rolling temperature of the finish rolling is 1150-1190 ℃, and the finish rolling temperature is 850-900 ℃.
- 6. The production method according to claim 2, characterized in that: the coiling temperature is 550-600 ℃.
- 7. The production method according to claim 2, characterized in that: the cold rolling reduction rate is 50-65%.
- 8. The production method according to claim 2, characterized in that: the running speed of the strip steel during continuous annealing is 80-200 m/min, the annealing soaking temperature is 800-840 ℃, the slow cooling end point temperature is 650-680 ℃, the overaging temperature is 400-430 ℃, and the finishing elongation is 1.3-1.5%.
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Cited By (2)
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|---|---|---|---|---|
| CN114277321A (en) * | 2021-12-29 | 2022-04-05 | 本钢板材股份有限公司 | 500 MPa-grade low-alloy cold-rolled steel plate for automobile and preparation method thereof |
| CN114737135A (en) * | 2022-04-20 | 2022-07-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-alloy ultrahigh-strength cold-rolled steel plate and production method thereof |
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Application publication date: 20210917 |