CN111363981A - 280 MPa-grade cold-rolled low-alloy structural steel and production method thereof - Google Patents
280 MPa-grade cold-rolled low-alloy structural steel and production method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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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- 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
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- 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
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- 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
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- C22C33/04—Making ferrous alloys by melting
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- 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
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- 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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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/021—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by dipping
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Abstract
The invention discloses 280 MPa-grade cold-rolled low-alloy structural steel which comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si: 0.08-0.15%, Mn: 1.30-1.40%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, Alt: 0.020-0.050%, Ti: 0.020-0.030%, N: less than or equal to 0.0060 percent, Ca: 0.0010-0.0030% and the balance of Fe and inevitable impurities. Its preparing process is also disclosed. The cold-rolled low-alloy structural steel has the characteristics of high strength, high yield ratio, high rigidity and low plasticity, and is widely applied to materials of automobile reinforcements and structural members. The requirements of light weight and material selection of the automobile are met, and the mechanical property and the process property meet the relevant standards and the requirements of users.
Description
Technical Field
The invention relates to the technical field of metallurgical plate production, in particular to 280 MPa-grade cold-rolled low-alloy structural steel and a production method thereof.
Background
With the high-speed development of the automobile industry and the requirements of energy conservation and emission reduction, lightweight materials are adopted in large quantities by automobile production. 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 application of a large amount of high-strength steel not only plays a role in energy conservation and emission reduction, but also can improve the safety performance of the automobile, maintain the production cost of the automobile and improve the recycling rate of the automobile.
The cold-rolled low-alloy high-strength steel is a high-strength steel developed for automobile structural members, and is a steel material with better performance than general carbon steel obtained by adding a small amount of or trace alloy elements into common low-carbon steel and adopting the modes of solid solution strengthening (or precipitation strengthening, fine grain strengthening), incomplete annealing and the like. The typical brands are 280VK, 340LA, 420LA and the like, have the characteristics of high strength, high yield ratio, high rigidity and low plasticity, and are widely applied to materials of automobile reinforcements and structural members.
The 280VK cold-rolled steel strip belongs to low-alloy high-strength automobile steel, 280 in the mark represents the minimum yield point value, V represents high-strength low alloy, the difference value of the yield point and the tensile strength is not specified, and K represents calm and fine-grained steel. The cold-rolled sheet is mainly used for reinforcing structural members such as frames, columns and beams of small automobiles, which have high requirements on strength and forming performance of materials. 280VK in domestic market mainly comprises Bao steel B280VK, Pan steel P280VK, ripple steel L280VK and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing 280 MPa-grade cold-rolled low-alloy structural steel and a production method thereof. The requirements of light weight and material selection of the automobile are met, and the mechanical property and the process property meet the relevant standards and the requirements of users.
In order to solve the technical problems, the invention adopts the following technical scheme:
the 280 MPa-grade cold-rolled low-alloy structural steel comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si: 0.08-0.15%, Mn: 1.30-1.40%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, Alt: 0.020-0.050%, Ti: 0.020-0.030%, N: less than or equal to 0.0060 percent, 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: 0.08%, Mn: 1.35%, P: 0.006%, S: 0.004%, Alt: 0.040%, Ti: 0.023%, N: 0.003%, 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: 0.07%, Mn: 1.36%, P: 0.004%, S: 0.003%, Alt: 0.035%, Ti: 0.024%, N: 0.005%, 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: 1.33%, P: 0.009%, S: 0.005%, Alt: 0.040%, Ti: 0.021%, N: 0.004%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
A production method of steel for a 280 MPa-grade cold-rolled low-alloy structure comprises the following steps:
(1) the smelting-continuous casting production process flow comprises the following steps: pretreatment of molten iron, converter, LF refining and casting machine; the molten steel for the casting machine comprises the following components: 0.06-0.08%, Si: 0.08-0.15%, Mn: 1.30-1.40%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, Alt: 0.020-0.050%, Ti: 0.020-0.030%, N: less than or equal to 0.0060 percent, Ca: 0.0010-0.0030%;
(2) the hot rolling production process flow comprises the following steps: heating a casting blank, rough rolling, finish rolling and coiling, wherein the tapping temperature of the casting blank is 1220 +/-20 ℃, the rough rolling is performed by a 3+3 mode 2-frame rolling mill, the finish rolling is performed by a 7-frame continuous variable-crown rolling mill, the thickness of an intermediate blank is 40-45mm, the finish rolling temperature of the finish rolling is 870 +/-20 ℃, the thickness of a hot rolled steel strip is 4.0mm, the cooling adopts laminar flow cooling equipment and a front dispersive cooling mode, and the coiling temperature is 590 +/-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 1.6mm, 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 780 +/-20 ℃, soaking for 150 plus 200S, cooling to 630 +/-10 ℃ at the speed of 3-4 ℃/S, cooling to 450 ℃ at the cooling speed of 10-15 ℃/S, and setting the flat elongation to be 1.2-1.6%.
Compared with the prior art, the invention has the beneficial technical effects that:
the metallographic microstructure of the low-alloy high-strength steel prepared by the invention is ferrite, and the grain size is between 11.0 grade and 11.5 grade.
The 280 MPa-grade cold-rolled low-alloy structural steel produced by the method provided by the invention is subjected to stamping use tests in multiple automobile factories, and all indexes of surface quality and performance meet the requirements of relevant technical standards 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 relevant standards and the user requirements. 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 schematic microstructure of example 1.
Detailed Description
Example 1
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out tapping at 1630 ℃. And then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1560 ℃, carrying out temperature measurement and component fine adjustment on the LF external refining, and the chemical components of the ladle casting machine for the LF external refining are shown in Table 1. The superheat degree of the slab continuous casting is 21 ℃, and then slab cleaning, slow cooling and quality inspection of the continuous casting slab are carried out. The heating temperature of the plate blank is 1210 ℃, the heating time is 203min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The finish rolling temperature is 872 ℃, and the thickness of the finished product is 4.0 mm. And the laminar cooling adopts pre-dispersion cooling, and the temperature of the steel strip is reduced to 593 ℃ for coiling. The hot-rolled strip steel is pickled by a hydrochloric acid tank, the acid tank adopts an i-BOX technology newly developed by MH, the operation and maintenance are greatly simplified, the energy and labor force are saved, after the surface oxide scale of the hot-rolled strip steel is removed, the hot-rolled strip steel is cold-rolled by a 5-frame UCM rolling mill, the cold-rolling reduction rate is 60 percent, and the target thickness is 1.6 mm. The cold-hard coil continuous annealing is carried out in a continuous vertical annealing furnace with HGJC function, the running speed of the steel strip is 90m/min, the soaking temperature is 785 ℃, the soaking time is 190S, the rapid cooling starting temperature is 630 ℃, the rapid cooling speed is 11 ℃/S, the overaging temperature is 350 ℃, and the leveling elongation is 1.6%. And finally, detecting the product performance.
Example 2
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out tapping at 1631 ℃. And then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1560 ℃, carrying out temperature measurement and component fine adjustment on the LF external refining, and the chemical components of the ladle casting machine for the LF external refining are shown in Table 1. The superheat degree of the continuous casting of the slab is 23 ℃, and then slab cleaning, slow cooling and continuous casting slab quality inspection are carried out. The heating temperature of the plate blank is 1214 ℃, the heating time is 208min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The finish rolling temperature is 875 ℃, and the thickness of the finished product is 4.0 mm. And the laminar cooling adopts front dispersion cooling, and the temperature of the steel strip is reduced to 592 ℃ for coiling. The hot-rolled strip steel is pickled by a hydrochloric acid tank, the acid tank adopts an i-BOX technology newly developed by MH, the operation and maintenance are greatly simplified, the energy and labor force are saved, after the surface oxide scale of the hot-rolled strip steel is removed, the hot-rolled strip steel is cold-rolled by a 5-frame UCM rolling mill, the cold-rolling reduction rate is 60 percent, and the target thickness is 1.6 mm. The cold-hard coil continuous annealing is carried out in a continuous vertical annealing furnace with HGJC function, the running speed of the steel strip is 100m/min, the soaking temperature is 785 ℃, the soaking time is 170S, the rapid cooling starting temperature is 630 ℃, the rapid cooling speed is 12 ℃/S, the overaging temperature is 340 ℃, and the leveling elongation is 1.6%. And finally, detecting the product performance.
Example 3
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out steel tapping at the temperature of 1648 ℃. And then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1560 ℃, carrying out temperature measurement and component fine adjustment on the LF external refining, and the chemical components of the ladle casting machine for the LF external refining are shown in Table 2. The superheat degree of the continuous casting of the slab is 26 ℃, and then slab cleaning, slow cooling and continuous casting slab quality inspection are carried out. The heating temperature of the plate blank is 1216 ℃, the heating time is 203min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The finish rolling temperature is 877 ℃, and the thickness of the finished product is 4.0 mm. And the laminar cooling adopts front dispersion cooling, and the temperature of the steel strip is reduced to 594 ℃ for coiling. The hot-rolled strip steel is pickled by a hydrochloric acid tank, the acid tank adopts an i-BOX technology newly developed by MH, the operation and maintenance are greatly simplified, the energy and labor force are saved, after the surface oxide scale of the hot-rolled strip steel is removed, the hot-rolled strip steel is cold-rolled by a 5-frame UCM rolling mill, the cold-rolling reduction rate is 60 percent, and the target thickness is 1.6 mm. The cold-hard coil continuous annealing is carried out in a continuous vertical annealing furnace with HGJC function, the running speed of a steel strip is 110m/min, the soaking temperature is 765 ℃, the soaking time is 112S, the quick cooling starting temperature is 630 ℃, the quick cooling speed is 14 ℃/S, the overaging temperature is 330 ℃, and the leveling elongation is 1.6%. And finally, detecting the product performance.
TABLE 1 chemical composition (wt%) of inventive examples 1 to 3
| Examples | C | Si | Mn | P | S | Alt | Ti | N | Ca |
| 1 | 0.07 | 0.08 | 1.35 | 0.006 | 0.004 | 0.040 | 0.023 | 0.003 | 0.002 |
| 2 | 0.07 | 0.07 | 1.36 | 0.004 | 0.003 | 0.035 | 0.024 | 0.005 | 0.002 |
| 3 | 0.07 | 0.08 | 1.33 | 0.009 | 0.005 | 0.040 | 0.021 | 0.004 | 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 280 MPa-grade cold-rolled low-alloy structural steel produced by the method provided by the invention meet the requirements of the agreement signed by the user.
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 280 MPa-grade cold-rolled low-alloy structural steel is characterized by comprising the following chemical components in percentage by mass: c: 0.06-0.08%, Si: 0.08-0.15%, Mn: 1.30-1.40%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, Alt: 0.020-0.050%, Ti: 0.020-0.030%, N: less than or equal to 0.0060 percent, Ca: 0.0010-0.0030% and the balance of Fe and inevitable impurities.
2. The steel for a 280 MPa-grade cold-rolled low-alloy structure according to claim 1, comprising the following chemical components in percentage by mass: c: 0.07%, Si: 0.08%, Mn: 1.35%, P: 0.006%, S: 0.004%, Alt: 0.040%, Ti: 0.023%, N: 0.003%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
3. The steel for a 280 MPa-grade cold-rolled low-alloy structure according to claim 1, comprising the following chemical components in percentage by mass: c: 0.07%, Si: 0.07%, Mn: 1.36%, P: 0.004%, S: 0.003%, Alt: 0.035%, Ti: 0.024%, N: 0.005%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
4. The steel for a 280 MPa-grade cold-rolled low-alloy structure according to claim 1, comprising the following chemical components in percentage by mass: c: 0.07%, Si: 0.08%, Mn: 1.33%, P: 0.009%, S: 0.005%, Alt: 0.040%, Ti: 0.021%, N: 0.004%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
5. The method for producing steel for a 280MPa grade cold rolled low alloy structure according to any one of claims 1 to 4, comprising:
(1) the smelting-continuous casting production process flow comprises the following steps: pretreatment of molten iron, converter, LF refining and casting machine; the molten steel for the casting machine comprises the following components: 0.06-0.08%, Si: 0.08-0.15%, Mn: 1.30-1.40%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, Alt: 0.020-0.050%, Ti: 0.020-0.030%, N: less than or equal to 0.0060 percent, Ca: 0.0010-0.0030%;
(2) the hot rolling production process flow comprises the following steps: heating a casting blank, rough rolling, finish rolling and coiling, wherein the tapping temperature of the casting blank is 1220 +/-20 ℃, the rough rolling is performed by a 3+3 mode 2-frame rolling mill, the finish rolling is performed by a 7-frame continuous variable-crown rolling mill, the thickness of an intermediate blank is 40-45mm, the finish rolling temperature of the finish rolling is 870 +/-20 ℃, the thickness of a hot rolled steel strip is 4.0mm, the cooling adopts laminar flow cooling equipment and a front dispersive cooling mode, and the coiling temperature is 590 +/-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 1.6mm, 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 780 +/-20 ℃, soaking for 150 plus 200S, cooling to 630 +/-10 ℃ at the speed of 3-4 ℃/S, cooling to 450 ℃ at the cooling speed of 10-15 ℃/S, and setting the flat elongation to be 1.2-1.6%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112080692A (en) * | 2020-08-26 | 2020-12-15 | 包头钢铁（集团）有限责任公司 | 280 MPa-grade cold-rolled low-yield-ratio stamping steel for automobile structure 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 |
| CN115418564A (en) * | 2022-08-18 | 2022-12-02 | 包头钢铁（集团）有限责任公司 | Rare earth treated low-yield-ratio automobile structural steel and production method thereof |
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2020
- 2020-03-04 CN CN202010141397.1A patent/CN111363981A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112080692A (en) * | 2020-08-26 | 2020-12-15 | 包头钢铁（集团）有限责任公司 | 280 MPa-grade cold-rolled low-yield-ratio stamping steel for automobile structure 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 |
| CN115418564A (en) * | 2022-08-18 | 2022-12-02 | 包头钢铁（集团）有限责任公司 | Rare earth treated low-yield-ratio automobile structural steel and production method thereof |
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