CN111394643A - 420 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and production method thereof - Google Patents
420 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and production method thereof Download PDFInfo
- Publication number
- CN111394643A CN111394643A CN202010141379.3A CN202010141379A CN111394643A CN 111394643 A CN111394643 A CN 111394643A CN 202010141379 A CN202010141379 A CN 202010141379A CN 111394643 A CN111394643 A CN 111394643A
- Authority
- CN
- China
- Prior art keywords
- cold
- rolling
- rolled
- steel
- strength steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
-
- 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
-
- 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
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
-
- 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
-
- 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
-
- 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
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Landscapes
- 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 discloses 420 MPa-grade cold-rolled low-alloy high-strength steel for automobiles, which is characterized by comprising the following chemical components in percentage by mass: c: 0.06-0.08%, Si: 0.08 to 0.13%, Mn: 1.00-1.10%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, Alt: 0.020-0.050%, Ti: 0.020 to 0.030%, Nb: 0.040-0.050%, Ca: 0.0010-0.0030% and the balance of Fe and inevitable impurities. Its preparing process is also disclosed. The cold-rolled low-alloy high-strength steel has the characteristics of low yield ratio, high initial work hardening rate, good strength and ductility matching and the like, meets the requirement of light weight material selection of automobiles, and meets the requirement of EN10268-2013 on cold-forming high-yield-strength cold-rolled steel strip in mechanical property and technological property.
Description
Technical Field
The invention relates to the technical field of metallurgical plate production, in particular to 420 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and a production method thereof.
Background
In 2018, the automobile sales volume of China breaks through 2323.7 thousands, the automobile is globally first in 10 continuous years, and the automobile yield is estimated to reach 3500 thousands in 2025. With the explosive increase of automobile output, the environmental and energy crisis is increasingly aggravated, and energy conservation and emission reduction become important problems in the automobile manufacturing industry. The modern technology and the method are applied to reduce the weight of parts or the whole automobile, the goals of energy conservation, emission reduction and consumption reduction are realized by reducing weight on the premise of ensuring the performances such as safety and the like, and the automobile lightweight technology becomes the development trend of the current automobile industry.
In recent years, in order to meet the development requirements of weight reduction, energy conservation and safety of the modern automobile industry, the research and development of cold-rolled high-strength steel plates for automobiles are enhanced by all iron and steel enterprises which produce cold-rolled high-strength steel at home and abroad. In automobile manufacturing, stressed structural members and reinforcements such as automobile chassis and wheelchair supports need to have good deformation resistance, i.e. high yield strength and high yield ratio.
The cold-rolled low-alloy high-strength steel is a high-strength steel developed for automobile structural members, and a small amount of alloy elements such as niobium and/or titanium are added into low-carbon steel, so that the low-carbon steel and elements such as carbon, nitrogen and the like form carbide and nitride, and are precipitated on a ferrite body, thereby improving the strength of the steel. The 420MPa cold-rolled low-alloy high-strength steel for the automobile represents a higher strength level of national standard cold-rolled low-alloy high-strength steel, has good forming performance and higher strength, and is mainly used for structural members and reinforcing members such as automobile seats, cross beams and the like.
Disclosure of Invention
The invention aims to provide 420 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and a production method thereof, the cold-rolled low-alloy high-strength steel has the characteristics of low yield ratio, high initial work hardening rate, good strength and ductility matching and the like, meets the requirements of light weight material selection of automobiles, and meets the requirements of EN10268-2013 cold-formed high-yield-strength cold-rolled steel strips on mechanical properties and technological properties.
In order to solve the technical problems, the invention adopts the following technical scheme:
the 420 MPa-grade cold-rolled low-alloy high-strength steel for the automobile comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si: 0.08 to 0.13%, Mn: 1.00-1.10%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, Alt: 0.020-0.050%, Ti: 0.020 to 0.030%, Nb: 0.040-0.050%, Ca: 0.0010-0.0030% and the balance of Fe and inevitable impurities.
Further, the paint comprises the following chemical components in percentage by mass: c: 0.07%, Si: 0.09%, Mn: 1.05%, P: 0.010%, S: 0.003%, Alt: 0.035%, Ti: 0.024%, Nb: 0.044%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
Further, the paint comprises the following chemical components in percentage by mass: c: 0.07%, Si: 0.06%, Mn: 1.04%, P: 0.004%, S: 0.005%, Alt: 0.035%, Ti: 0.022%, Nb: 0.042%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
Further, the paint comprises the following chemical components in percentage by mass: c: 0.07%, Si: 0.08%, Mn: 1.06%, P: 0.009%, S: 0.004%, Alt: 0.040%, Ti: 0.025%, Nb: 0.040%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
A production method of 420 MPa-grade cold-rolled low-alloy high-strength steel for automobiles comprises the following steps:
(1) the smelting-continuous casting production process flow comprises the following steps of molten iron pretreatment, converter, L F refining and casting machine, wherein molten iron for the casting machine comprises 0.06-0.08% of C, 0.08-0.13% of Si, 1.00-1.10% of Mn, less than or equal to 0.018% of P, less than or equal to 0.005% of S, 0.020-0.050% of Alt, 0.020-0.030% of Ti, 0.040-0.050% of Nb and 0.0010-0.0030% of Ca;
(2) the hot rolling production process flow comprises the following steps: heating a casting blank, rough rolling, finish rolling and coiling; the casting blank discharging temperature is 1220 +/-20 ℃, the rough rolling is performed by adopting a 3+3 mode 2-frame rolling mill, the finish rolling is performed by adopting a 7-frame continuous variable crown (cvc) rolling mill, and the thickness of an intermediate blank is 40-45 mm; the finish rolling temperature of the finish rolling is 880 +/-20 ℃, and the thickness of the hot rolled steel strip is 5.0 mm; the cooling adopts laminar flow cooling equipment and a front dispersion cooling mode, and the coiling temperature is 570 +/-20 ℃;
(3) acid washing cold rolling process flow: pickling the hot-rolled strip steel by using a hydrochloric acid tank of an i-BOX technology, removing surface iron scales, cold-rolling by using a 5-stand cold rolling mill until the target thickness is 2.0mm, wherein the cold-rolling reduction rate is 60%;
(4) the continuous annealing process flow comprises the following steps: uncoiling the cold-hard coil steel strip, heating to 760 +/-20 ℃, soaking for 120- & gt 170 seconds, cooling to 580 +/-20 ℃ at the speed of 3-5 ℃/S, then cooling to 400 +/-20 ℃ at the cooling speed of 10-15 ℃/S, and setting the flat elongation to 1.6%.
Compared with the prior art, the invention has the beneficial technical effects that:
the low-alloy high-strength steel has a metallographic microstructure of ferrite and a grain size of 11.5-12. The 420 MPa-grade cold-rolled low-alloy high-strength steel for automobiles produced by the method provided by the invention is subjected to stamping use tests in a plurality of automobile factories, and all indexes of surface quality and performance reach the relevant technical standard requirements of the automobile factories, so that the use requirements of the relevant automobile factories are met. The mechanical property and the process property meet the requirements of EN10268-2013 cold-forming high-yield-strength cold-rolled steel strip. Meanwhile, the alloy of the invention has low cost and simple preparation method, and is suitable for industrial production.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a microstructure diagram of example 1.
Detailed Description
The present invention is described in more detail below by way of specific examples. The examples are merely illustrative of the best mode of carrying out the invention and do not limit the scope of the invention in any way.
Example 1
The hot-rolled strip steel is subjected to desulphurization pretreatment, the molten iron is subjected to decarburization and dephosphorization by adopting a top-bottom combined blowing converter to obtain molten steel, argon is blown in the whole smelting process of the converter, scrap steel is added into the converter, the tapping temperature of the converter is 1630 ℃, then the molten steel after smelting of the converter is subjected to L F external refining, the refining in-place temperature is not less than 1560 ℃, the temperature and the component fine adjustment are carried out by the L F external refining, L F external refining is provided for a casting machine, the chemical components are shown in table 1, the superheat degree of continuous casting of the strip blank is 22 ℃, then the strip blank is cleaned, slowly cooled and the quality inspection of the continuous casting blank is carried out, the heating temperature of the strip blank is 1230 ℃, the heating time is 226min, the heated strip blank is subjected to high-pressure water dephosphorization, the width is determined by width determination, 2 stand rough rolling is adopted, 7 stand C finish rolling is carried out, the finish rolling temperature is 882 ℃, the thickness of the finished product is 5.0mm, laminar cooling is adopted, the pre-dispersion cooling is reduced to 572 ℃, the temperature is reduced to be coiled, the hot-rolled strip steel is subjected to a hydrochloric acid pickling tank, the pickling tank is carried out by adopting the newly developed i-to the cold rolling technology, the cold rolling mill, the cold rolling speed of the cold rolling mill is 580.5.6 mm, the hot-rolled strip steel strip rolling mill, the annealing is carried out, the annealing process of hot-rolled strip steel.
Example 2
The hot-rolled strip steel is subjected to desulfurization pretreatment, the molten iron is subjected to decarburization and dephosphorization by adopting a top-bottom combined blowing converter to obtain molten steel, argon is blown in the whole smelting process of the converter, scrap steel is added into the converter, the tapping temperature of the converter is 1631 ℃, then the molten steel after smelting of the converter is subjected to L F external refining, the refining in-place temperature is not less than 1560 ℃, L F external refining is subjected to temperature measurement and component fine adjustment, L F external refining is subjected to casting machine chemical components shown in table 1, the superheat degree of continuous casting of the strip blank is 26 ℃, then slab cleaning, slow cooling and continuous casting billet quality inspection are carried out, the heating temperature of the strip blank is 1224 ℃, the heating time is 238min, the heated strip blank is subjected to high-pressure water dephosphorization, width setting and width setting are carried out, 2 stand rough rolling is adopted, 7 stand C finish rolling is carried out, the finish rolling temperature is 885 ℃, the thickness of the finished product is 5.0mm, laminar cooling is adopted, the front dispersion cooling is adopted, the temperature of the steel strip is reduced to 575 ℃ for coiling, the hot-rolled strip steel is subjected to pickling in a hydrochloric acid pickling tank, the pickling tank is subjected to a newly developed i-cold rolling mill, the newly developed i-rolled strip steel, the annealing technology is greatly reduced, the annealing speed of 120.3.3.3 mm, the annealing is reduced, the annealing speed of the annealing, the annealing of the hot-rolled steel strip mill, the hot-rolled steel strip is reduced by the hot-.
Example 3
The hot-rolled strip steel is subjected to desulphurization pretreatment, the molten iron is subjected to decarburization and dephosphorization by adopting a top-bottom combined blowing converter to obtain molten steel, argon is blown in the whole smelting process of the converter, scrap steel is added into the converter, the tapping temperature of the converter is 1647 ℃, then the molten steel after smelting of the converter is subjected to L F external refining, the refining in-place temperature is more than or equal to 1560 ℃, the temperature and the component fine adjustment are carried out by the L F external refining, L F external refining is provided for a casting machine, the chemical components are shown in table 2, the superheat degree of continuous casting of the strip blank is 28 ℃, then the strip blank is cleaned, slowly cooled and the quality inspection of the continuous casting blank, the heating temperature of the strip blank is 1226 ℃, the heating time is 216min, the heated strip blank is subjected to high-pressure water dephosphorization, the width is determined by a width-fixing press, the rough rolling is carried out by adopting a 2 stand, the CVC finish rolling of a 7 stand, the finish rolling temperature is 887 ℃, the thickness of the finished product is 5.0mm, the laminar cooling is dispersed before the laminar flow is adopted, the temperature of the steel strip is reduced to the temperature of 120 ℃ to the temperature of the steel strip, the rolling is coiled, the hot-rolled by the MH, the pickling tank is carried out by adopting the newly developed i-rolled by a hydrochloric acid bath, the pickling process of a 780 i-cold rolling mill, the annealing process is carried out, the annealing process of the annealing.
TABLE 1 chemical composition (wt%) of inventive examples 1 to 3
| Examples | C | Si | Mn | P | S | Alt | Ti | Nb | Ca |
| 1 | 0.07 | 0.09 | 1.05 | 0.010 | 0.003 | 0.035 | 0.024 | 0.044 | 0.002 |
| 2 | 0.07 | 0.06 | 1.04 | 0.004 | 0.005 | 0.035 | 0.022 | 0.042 | 0.002 |
| 3 | 0.07 | 0.08 | 1.06 | 0.009 | 0.004 | 0.040 | 0.025 | 0.040 | 0.002 |
Mechanical property test is carried out on the steel coils of the embodiments 1-3 of the invention, and the test results are shown in table 2.
TABLE 2 mechanical properties of steel coils according to the invention in examples 1 to 3
As can be seen from the data in Table 2, the mechanical properties and the technological properties of the 420 MPa-grade cold-rolled low-alloy high-strength steel for automobiles produced by the method provided by the invention meet the requirements of EN 10268-2013.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. The 420 MPa-grade cold-rolled low-alloy high-strength steel for the automobile is characterized by comprising the following chemical components in percentage by mass: c: 0.06-0.08%, Si: 0.08 to 0.13%, Mn: 1.00-1.10%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, Alt: 0.020-0.050%, Ti: 0.020 to 0.030%, Nb: 0.040-0.050%, Ca: 0.0010-0.0030% and the balance of Fe and inevitable impurities.
2. The 420MPa grade cold-rolled low-alloy high-strength steel for the automobile as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by mass: c: 0.07%, Si: 0.09%, Mn: 1.05%, P: 0.010%, S: 0.003%, Alt: 0.035%, Ti: 0.024%, Nb: 0.044%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
3. The 420MPa grade cold-rolled low-alloy high-strength steel for the automobile as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by mass: c: 0.07%, Si: 0.06%, Mn: 1.04%, P: 0.004%, S: 0.005%, Alt: 0.035%, Ti: 0.022%, Nb: 0.042%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
4. The 420MPa grade cold-rolled low-alloy high-strength steel for the automobile as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by mass: c: 0.07%, Si: 0.08%, Mn: 1.06%, P: 0.009%, S: 0.004%, Alt: 0.040%, Ti: 0.025%, Nb: 0.040%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
5. The production method of 420MPa grade cold-rolled low-alloy high-strength steel for the automobile according to any one of claims 1 to 4, characterized by comprising the following steps:
(1) the smelting-continuous casting production process flow comprises the following steps of molten iron pretreatment, converter, L F refining and casting machine, wherein molten iron for the casting machine comprises 0.06-0.08% of C, 0.08-0.13% of Si, 1.00-1.10% of Mn, less than or equal to 0.018% of P, less than or equal to 0.005% of S, 0.020-0.050% of Alt, 0.020-0.030% of Ti, 0.040-0.050% of Nb and 0.0010-0.0030% of Ca;
(2) the hot rolling production process flow comprises the following steps: heating a casting blank, rough rolling, finish rolling and coiling; the discharging temperature of the casting blank is 1220 +/-20 ℃, the rough rolling is carried out by adopting a 3+3 mode 2-frame rolling mill, the finish rolling is carried out by adopting a 7-frame continuous variable-crown rolling mill, and the thickness of the intermediate blank is 40-45 mm; the finish rolling temperature of the finish rolling is 880 +/-20 ℃, and the thickness of the hot rolled steel strip is 5.0 mm; the cooling adopts laminar flow cooling equipment and a front dispersion cooling mode, and the coiling temperature is 570 +/-20 ℃;
(3) acid washing cold rolling process flow: pickling the hot-rolled strip steel by using a hydrochloric acid tank of an i-BOX technology, removing surface iron scales, cold-rolling by using a 5-stand cold rolling mill until the target thickness is 2.0mm, wherein the cold-rolling reduction rate is 60%;
(4) the continuous annealing process flow comprises the following steps: uncoiling the cold-hard coil steel strip, heating to 760 +/-20 ℃, soaking for 120- & gt 170 seconds, cooling to 580 +/-20 ℃ at the speed of 3-5 ℃/S, then cooling to 400 +/-20 ℃ at the cooling speed of 10-15 ℃/S, and setting the flat elongation to 1.6%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010141379.3A CN111394643A (en) | 2020-03-04 | 2020-03-04 | 420 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010141379.3A CN111394643A (en) | 2020-03-04 | 2020-03-04 | 420 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111394643A true CN111394643A (en) | 2020-07-10 |
Family
ID=71427170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010141379.3A Withdrawn CN111394643A (en) | 2020-03-04 | 2020-03-04 | 420 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111394643A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113061809A (en) * | 2021-03-16 | 2021-07-02 | 包头钢铁（集团）有限责任公司 | 380 MPa-level hot rolled steel strip for 2-4mm automobile structure and production method thereof |
| CN113061797A (en) * | 2021-03-16 | 2021-07-02 | 包头钢铁（集团）有限责任公司 | Improved production method of QStE420TM hot-rolled steel plate |
| CN113943888A (en) * | 2021-09-01 | 2022-01-18 | 包头钢铁（集团）有限责任公司 | 1.5-1.8 mm340 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and production method thereof |
| CN114015938A (en) * | 2021-10-27 | 2022-02-08 | 包头钢铁（集团）有限责任公司 | 240 MPa-grade cold-rolled carbon structural steel and production method thereof |
| CN114959481A (en) * | 2022-05-31 | 2022-08-30 | 本钢板材股份有限公司 | High-elongation 420 MPa-grade hot-galvanized low-alloy high-strength steel and production method thereof |
-
2020
- 2020-03-04 CN CN202010141379.3A patent/CN111394643A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113061809A (en) * | 2021-03-16 | 2021-07-02 | 包头钢铁（集团）有限责任公司 | 380 MPa-level hot rolled steel strip for 2-4mm automobile structure and production method thereof |
| CN113061797A (en) * | 2021-03-16 | 2021-07-02 | 包头钢铁（集团）有限责任公司 | Improved production method of QStE420TM hot-rolled steel plate |
| CN113943888A (en) * | 2021-09-01 | 2022-01-18 | 包头钢铁（集团）有限责任公司 | 1.5-1.8 mm340 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and production method thereof |
| CN114015938A (en) * | 2021-10-27 | 2022-02-08 | 包头钢铁（集团）有限责任公司 | 240 MPa-grade cold-rolled carbon structural steel and production method thereof |
| CN114959481A (en) * | 2022-05-31 | 2022-08-30 | 本钢板材股份有限公司 | High-elongation 420 MPa-grade hot-galvanized low-alloy high-strength steel and production method thereof |
| CN114959481B (en) * | 2022-05-31 | 2023-09-26 | 本钢板材股份有限公司 | Hot-dip galvanized low-alloy high-strength steel with high elongation of 420MPa and production method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107619993B (en) | Cold-rolled martensite steel plate with yield strength of 750MPa and manufacturing method thereof | |
| CN111394643A (en) | 420 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and production method thereof | |
| CN112725704B (en) | Hot-galvanized 420 MPa-grade low-alloy high-strength steel for automobiles and production method thereof | |
| CN112080692A (en) | 280 MPa-grade cold-rolled low-yield-ratio stamping steel for automobile structure and production method thereof | |
| CN109161805B (en) | 590 MPa-grade automobile lightweight cold-rolled dual-phase steel and production method thereof | |
| CN106011646A (en) | High-surface-quality automotive hot rolling acid pickling steel with tensile strength of 590 MPa and production method | |
| CN109487153B (en) | High-reaming hot-rolled pickled steel plate with tensile strength of 440MPa | |
| CN110578100A (en) | cold-rolled CP980 steel with different yield strength grades and production method thereof | |
| CN112375971A (en) | Low-cost cold-rolled low-carbon enamel steel and manufacturing method thereof | |
| CN114525449A (en) | DC04 automobile steel plate for cold rolling deep drawing and manufacturing method thereof | |
| CN113061809A (en) | 380 MPa-level hot rolled steel strip for 2-4mm automobile structure and production method thereof | |
| CN110029286A (en) | A kind of 780MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof | |
| CN111363981A (en) | 280 MPa-grade cold-rolled low-alloy structural steel and production method thereof | |
| CN107881409A (en) | A kind of side's tank cold rolling tin plate and its manufacture method | |
| CN109321825B (en) | 450 MPa-grade automobile lightweight cold-rolled dual-phase steel and production method thereof | |
| CN115537661B (en) | 600 MPa-level hot dip galvanized dual-phase steel for automobile structure and production method thereof | |
| CN113061797A (en) | Improved production method of QStE420TM hot-rolled steel plate | |
| CN112410685A (en) | Cold-rolled 980 MPa-grade quenching distribution steel and production method thereof | |
| CN113943888A (en) | 1.5-1.8 mm340 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and production method thereof | |
| CN112226679B (en) | Cold-rolled 980 MPa-grade martensitic steel and production method thereof | |
| CN114015938A (en) | 240 MPa-grade cold-rolled carbon structural steel and production method thereof | |
| CN112501513B (en) | Low-carbon acid-pickled steel with excellent formability and surface quality and production method thereof | |
| CN108396242A (en) | A kind of low cost welded tube superhigh intensity cold rolling continuous annealing strip and its production method | |
| CN118256812A (en) | 380 MPa-grade low-cost cold-rolled low-alloy high-strength steel and production method thereof | |
| CN115074639A (en) | Hot-rolled steel plate for automobile beam with tensile strength of 600MPa |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200710 |