CN116334501A - High-yield strength 780 MPa-grade cold-rolled dual-phase steel and production method thereof - Google Patents
High-yield strength 780 MPa-grade cold-rolled dual-phase steel and production method thereof Download PDFInfo
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- 229910000885 Dual-phase steel Inorganic materials 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 238000005096 rolling process Methods 0.000 claims description 16
- 238000005097 cold rolling Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 238000005098 hot rolling Methods 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005554 pickling Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 2
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 claims description 2
- 238000005275 alloying Methods 0.000 claims description 2
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 2
- 229910052786 argon Inorganic materials 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 238000005261 decarburization Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims description 2
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 238000005502 peroxidation Methods 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 238000005482 strain hardening Methods 0.000 abstract description 4
- 230000004069 differentiation Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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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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- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention discloses high yield strength 780MPa grade cold-rolled dual-phase steel, which comprises the following chemical components in percentage by mass: c:0.08 to 0.14 percent, si is less than or equal to 0.40 percent, mn:1.7 to 2.2 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.015 percent, and Alt:0.015 to 0.040 percent, less than or equal to 0.5 percent of Cr, less than or equal to 0.4 percent of Mo, less than or equal to 0.04 percent of Nb, less than or equal to 0.04 percent of Ti, and less than or equal to Ca:0.0008 to 0.0025% of Fe and unavoidable impurities. Its preparing process is also disclosed. The 780 MPa-grade cold-rolled dual-phase steel has the characteristics of high strength, high work hardening index and the like, meets the requirements of light material selection and user differentiation of automobiles, and has the mechanical properties of: yield strength R p0.2 : 500-630 MPa, tensile strength R m Not less than 780MPa, elongation A 50 ≥12％。
Description
Technical Field
The invention relates to the technical field of metallurgical plates, in particular to 780 MPa-grade cold-rolled dual-phase steel with high yield strength and a production method thereof.
Background
In recent years, the automobile manufacturing industry in China develops rapidly, and the global sales volume is kept for a plurality of years, so that the automobile manufacturing industry in China becomes the pillar industry for national economic development. The increase of the yield and the conservation amount of the automobile also brings a plurality of problems, and the problems of the fuel consumption, the pollution of the tail gas emission to the environment and the traffic safety brought by the increase of the conservation amount of the automobile are all urgent to be solved. The light weight of automobiles is a necessary way for reducing oil consumption and tail gas emission, and is the development direction of the current automobile industry. Meanwhile, the safety of the automobile is more important, the national requirements on the collision safety of the automobile are more and more strict, the weight of the automobile is reduced, the safety of people is ensured, and the most effective method is to use a large amount of advanced high-strength steel such as 780MPa grade cold-rolled high-strength dual-phase steel on the automobile body, and the weight reduction is realized by reducing the thickness of the steel plate and ensuring the safety of the automobile body.
780MPa grade cold-rolled high-strength dual-phase steel is advanced high-strength steel widely applied in the field of automobiles, mainly comprises ferrite and martensite, has the characteristics of high strength, high work hardening index and the like, and becomes a main force steel type for automobile weight reduction. The method is mainly applied to automobile structural members, reinforcing members and anti-collision members, such as B-pillar inner plates, vehicle bottom cross members, anti-collision bars, anti-collision bar reinforcing structural members and the like, and the development of the cold-rolled dual-phase steel products with the high yield strength of 780MPa can meet the diversified material selection requirements of users, so that the steel differential application for the automobile structure is realized.
At present, 780MPa grade cold-rolled dual-phase steel (a cold-rolled dual-phase steel plate with tensile strength of 780MPa grade and a preparation method thereof, application number 201810472821.3) produced by Mashan iron and steel Co-Ltd has high Nb (0.04-0.06%) content and product yield strength of 478-512 MPa in component design, which is different from the design components and performances of the invention; 780MPa grade cold-rolled dual-phase steel (a cold-rolled dual-phase steel with tensile strength of 780MPa grade and a production method thereof, application number of 20181082585. X) component design in the Tangshan iron and steel group limited responsibility company has differences between Si (0.30-0.50%), mn (1.40-1.70%), cr (0.40-0.60%), nb (0.025-0.050%), ti (0.025-0.050%) and design components of the invention, and Si and Cr are higher to influence the surface quality of products; the 800MPa grade cold-rolled dual-phase steel (800 MPa grade high yield ratio cold-rolled dual-phase steel and a preparation method thereof, application number 201910357999.8) produced by Mashan iron and steel stock company has higher Si (0.6-0.8%), cr (0.6-0.8%) and Nb (0.04-0.06%) contents in component design, and different from the design components of the invention, the higher strengthening elements and the higher hardenability elements cause higher cost, and the higher Si and Cr affect the surface quality of the product.
Disclosure of Invention
The invention aims to provide 780 MPa-grade cold-rolled dual-phase steel with high yield strength and a production method thereof, and 780 MPa-grade cold-rolled dual-phase steel has high strength and high work hardening indexAnd the like, meets the requirements of light material selection and user differentiation of automobiles, and has the mechanical properties of: yield strength R p0.2 : 500-630 MPa, tensile strength R m Not less than 780MPa, elongation A 50 ≥12％。
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a 780 MPa-grade cold-rolled dual-phase steel with high yield strength, which comprises the following chemical components in percentage by mass: c:0.08 to 0.14 percent, si is less than or equal to 0.40 percent, mn:1.7 to 2.2 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.015 percent, and Alt:0.015 to 0.040 percent, less than or equal to 0.5 percent of Cr, less than or equal to 0.4 percent of Mo, less than or equal to 0.04 percent of Nb, less than or equal to 0.04 percent of Ti, and less than or equal to Ca:0.0008 to 0.0025% of Fe and unavoidable impurities.
A production method of a high yield strength 780MPa grade cold-rolled dual-phase steel comprises the following steps:
(1) The smelting-continuous casting production process flow comprises the following steps: molten iron pretreatment-converter-LF refining-slab continuous casting; oxygen blowing, decarburization and heating are carried out in the bottom-top combined blowing smelting of the converter, aluminum iron, ferromanganese iron, ferrosilicon, ferrochrome and the like are added in the tapping process of the converter for deoxidization alloying, P, S components are controlled, the peroxidation of molten steel is prevented, and the tapping temperature is more than or equal to 1620 ℃; LF external refining adopts LF whole argon blowing technology, and adjusts the target component according to the molten steel component, and the molten steel component of the casting machine is C:0.08 to 0.14 percent, si is less than or equal to 0.40 percent, mn:1.7 to 2.2 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.015 percent, and Alt:0.015 to 0.040 percent, less than or equal to 0.5 percent of Cr, less than or equal to 0.4 percent of Mo, less than or equal to 0.04 percent of Nb, less than or equal to 0.04 percent of Ti, and less than or equal to Ca:0.0008 to 0.0025 percent; the continuous slab casting superheat degree is 15-40 ℃, and the pulling speed is controlled to be 0.8-1.5 m/min;
(2) The hot rolling production process flow comprises the following steps: heating a casting blank, rough rolling, finish rolling and coiling; the casting blank is subjected to rough rolling by adopting a 3+3 mode 2-frame rolling mill at the tapping temperature of 1200-1280 ℃ in the furnace time of 180-240 min, the finish rolling by adopting a 7-frame rolling mill at the finish rolling start temperature of 1000-1050 ℃, the finish rolling temperature of 850-910 ℃ and the thickness of the hot rolled steel strip of 2.2-4.0 mm; the cooling adopts laminar flow cooling equipment, and the coiling temperature is 550-650 ℃;
(3) The pickling cold rolling process flow comprises the following steps: after pickling the hot rolled steel strip to remove surface oxide scales, cold rolling the hot rolled steel strip by a 5-frame cold rolling mill, wherein the cold rolling reduction rate is 50-70%, and the thickness is 0.7-2.0 mm;
(4) The continuous annealing process flow comprises the following steps: the production speed is more than or equal to 60m/min, the chilled steel strip is uncoiled and then heated to 780-840 ℃, slowly cooled to 640-700 ℃, then cooled to 250-350 ℃, the overaging temperature is 250-350 ℃, the overaging treatment is finished, the final cooling is carried out to room temperature, and the elongation of the temper mill is 0.3-0.8%.
Further, the mechanical properties of the produced cold-rolled dual-phase steel are as follows: yield strength R p0.2 : 558-595 MPa, and tensile strength R m : 824-847 MPa, elongation A 50 ：16.0～19.0％。
Compared with the prior art, the invention has the beneficial technical effects that:
the 780MPa grade cold-rolled dual-phase steel produced by the invention has the characteristics of high strength, high work hardening index and the like, and meets the requirements of light weight material selection and user differentiation of automobiles, and the mechanical properties are as follows: yield strength R p0.2 : 500-630 MPa, tensile strength R m Not less than 780MPa, elongation A 50 ≥12％。
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a microstructure of an example.
Detailed Description
The following detailed description of the present invention is given by way of specific examples only to facilitate the understanding of the present invention, and not to limit the present invention.
Examples
The chemical compositions of the actual slabs are shown in table 1 according to the requirements of the steel-making production process.
TABLE 1 chemical composition (wt%) of the examples of the present invention
According to the requirements of the hot rolling process, the hot rolling thickness is 2.5-4.0 mm, and the actual process is shown in Table 2.
TABLE 2 Hot Rolling Process according to an embodiment of the invention
The cold rolling thickness is 1.2-2.0 mm according to the requirements of the cold rolling and annealing processes, and the actual process is shown in Table 3.
TABLE 3 annealing process of the examples of the invention
The mechanical properties of the steel strip of the example of the present invention were examined, and the examination results are shown in table 4.
TABLE 4 mechanical Properties of the Steel strip according to the example of the invention
As can be seen from the data in Table 4, the cold-rolled dual-phase steel has the mechanical properties: yield strength rp0.2: 558-595 MPa, tensile strength Rm: 824-847 MPa, elongation A50: 16.0-19.0%, and the steel strip product obtained by the process is suitable for users, has proper performance and can be popularized and used.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (3)
1. A high yield strength 780MPa grade cold-rolled dual-phase steel is characterized in that: the chemical components of the composition in percentage by mass are: c:0.08 to 0.14 percent, si is less than or equal to 0.40 percent, mn:1.7 to 2.2 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.015 percent, and Alt:0.015 to 0.040 percent, less than or equal to 0.5 percent of Cr, less than or equal to 0.4 percent of Mo, less than or equal to 0.04 percent of Nb, less than or equal to 0.04 percent of Ti, and less than or equal to Ca:0.0008 to 0.0025% of Fe and unavoidable impurities.
2. The method for producing the high yield strength 780MPa grade cold rolled dual phase steel according to claim 1, characterized in that: comprising the following steps:
(1) The smelting-continuous casting production process flow comprises the following steps: molten iron pretreatment-converter-LF refining-slab continuous casting; oxygen blowing, decarburization and heating are carried out in the bottom-top combined blowing smelting of the converter, aluminum iron, ferromanganese iron, ferrosilicon, ferrochrome and the like are added in the tapping process of the converter for deoxidization alloying, P, S components are controlled, the peroxidation of molten steel is prevented, and the tapping temperature is more than or equal to 1620 ℃; LF external refining adopts LF whole argon blowing technology, and adjusts the target component according to the molten steel component, and the molten steel component of the casting machine is C:0.08 to 0.14 percent, si is less than or equal to 0.40 percent, mn:1.7 to 2.2 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.015 percent, and Alt:0.015 to 0.040 percent, less than or equal to 0.5 percent of Cr, less than or equal to 0.4 percent of Mo, less than or equal to 0.04 percent of Nb, less than or equal to 0.04 percent of Ti, and less than or equal to Ca:0.0008 to 0.0025 percent; the continuous slab casting superheat degree is 15-40 ℃, and the pulling speed is controlled to be 0.8-1.5 m/min;
(2) The hot rolling production process flow comprises the following steps: heating a casting blank, rough rolling, finish rolling and coiling; the casting blank is subjected to rough rolling by adopting a 3+3 mode 2-frame rolling mill at the tapping temperature of 1200-1280 ℃ in the furnace time of 180-240 min, the finish rolling by adopting a 7-frame rolling mill at the finish rolling start temperature of 1000-1050 ℃, the finish rolling temperature of 850-910 ℃ and the thickness of the hot rolled steel strip of 2.2-4.0 mm; the cooling adopts laminar flow cooling equipment, and the coiling temperature is 550-650 ℃;
(3) The pickling cold rolling process flow comprises the following steps: after pickling the hot rolled steel strip to remove surface oxide scales, cold rolling the hot rolled steel strip by a 5-frame cold rolling mill, wherein the cold rolling reduction rate is 50-70%, and the thickness is 0.7-2.0 mm;
(4) The continuous annealing process flow comprises the following steps: the production speed is more than or equal to 60m/min, the chilled steel strip is uncoiled and then heated to 780-840 ℃, slowly cooled to 640-700 ℃, then cooled to 250-350 ℃, the overaging temperature is 250-350 ℃, the overaging treatment is finished, the final cooling is carried out to room temperature, and the elongation of the temper mill is 0.3-0.8%.
3. The method for producing the high yield strength 780MPa grade cold rolled dual phase steel according to claim 2, characterized in that: produced byThe mechanical properties of the cold-rolled dual-phase steel are as follows: yield strength R p0.2 : 558-595 MPa, and tensile strength R m : 824-847 MPa, elongation A 50 ：16.0～19.0％。
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| CN110029286A (en) * | 2019-05-27 | 2019-07-19 | 包头钢铁（集团）有限责任公司 | A kind of 780MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof |
| CN110042320A (en) * | 2019-05-27 | 2019-07-23 | 包头钢铁（集团）有限责任公司 | A kind of 500MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109161805A (en) * | 2018-10-24 | 2019-01-08 | 包头钢铁（集团）有限责任公司 | A kind of 590MPa grades of automotive light weight technology cold-rolled biphase steel and its production method |
| CN109930068A (en) * | 2019-03-27 | 2019-06-25 | 武汉钢铁有限公司 | A kind of 800MPa grades of ultra-thin specification cold-rolled biphase steel and preparation method thereof |
| CN110029286A (en) * | 2019-05-27 | 2019-07-19 | 包头钢铁（集团）有限责任公司 | A kind of 780MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof |
| CN110042320A (en) * | 2019-05-27 | 2019-07-23 | 包头钢铁（集团）有限责任公司 | A kind of 500MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof |
| CN111485177A (en) * | 2020-04-19 | 2020-08-04 | 包头钢铁（集团）有限责任公司 | Low-cost 780 MPa-grade cold-rolled dual-phase steel and production method thereof |
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