CN113061797A - Improved production method of QStE420TM hot-rolled steel plate - Google Patents
Improved production method of QStE420TM hot-rolled steel plate Download PDFInfo
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- CN113061797A CN113061797A CN202110281371.1A CN202110281371A CN113061797A CN 113061797 A CN113061797 A CN 113061797A CN 202110281371 A CN202110281371 A CN 202110281371A CN 113061797 A CN113061797 A CN 113061797A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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Abstract
The invention discloses a production method of an improved QStE420TM hot-rolled steel plate, which comprises the following main process parameters: the smelting-continuous casting production process flow comprises the following steps: KR desulfurization, converter smelting, LF refining and slab continuous casting; the tapping temperature of the converter is 1620-1640 ℃; ensuring the coordinated tapping of the components and the temperature; the hot rolling production process flow comprises the following steps: the method comprises the steps of heating furnace, rough rolling high-pressure water descaling, fixed width press, E1R1 rough rolling mill, E2R2 rough rolling mill, heat preservation cover, flying shear, finish rolling high-pressure water descaling, F1-F7 finishing mill, encrypted laminar cooling and coiling. The 420 MPa-level automobile steel prepared by the invention has the characteristic of high strength.
Description
Technical Field
The invention belongs to the technical field of metallurgical plate production, and particularly relates to an improved QStE420TM hot-rolled steel plate and a production method thereof.
Background
The automotive industry has become an important industry of pillars in the national economy of our country. Since the 21 st century, with the rapid increase of economy, the automobile industry is rapidly developing, the amount of automobile steel is continuously improved, and meanwhile, in order to meet the requirements of energy conservation, material conservation, improvement of automobile bearing capacity, service life extension and safe driving, the requirements of environmental protection and energy conservation are met, the automobile lightweight becomes the trend of automobile development in the world, wherein the function of a high-strength steel plate in the development can be called as a great weight, and the hot-rolled automobile structural steel QStE420TM not only has higher strength, but also has good surface quality and excellent forming performance, so the hot-rolled automobile structural steel QStE420TM is widely used in the automobile industry.
QStE420TM is a typical designation in the standard QStE series of steel materials, a hot-rolled fine-grained steel for cold deformation, for girder structural members requiring good cold-formability and having high or high strength requirements, which is similar to structural steel. In addition to the requirement for strength, higher elongation values and the like are also required to ensure good machine-shaping properties, and higher requirements are also imposed on surface quality, plate shape and dimensional tolerance.
QStE420TM is low-alloy high-strength steel, the adopted alloy design scheme is that microalloying elements such as Nb and Ti are added into low-carbon manganese steel in a compounding way, and the chemical element Mn can eliminate or weaken the hot brittleness of the steel caused by S. Nb, C and N have strong binding force, and the formed compound can block the movement of austenite grain boundaries and prevent the coarsening of austenite grains during heating. Meanwhile, Nb can also enlarge the temperature range of an austenite non-recrystallization region, so that the austenite recrystallization temperature is raised, and the nucleation rate of ferrite is further improved. Ti is easy to form carbide TiC with C in steel, and the dispersed precipitation of Ti can also refine grains. Reasonable industrial control is realized on the QStE420TM hot-rolled steel plate by researching, exploring, controlling rolling and controlling cooling technologies, and finally the comprehensive quality requirements of steel plate structure, performance and the like are met.
Disclosure of Invention
The invention aims to solve the technical problem of providing an improved QStE420TM hot-rolled steel plate and a production method thereof, and the 420 MPa-level structural automobile steel has the characteristics of high strength and high yield ratio and is a material widely applied to automobile reinforcements and structural parts. The requirements of light weight and material selection of the automobile are met, and the mechanical property and the process property meet the requirements of relevant standards and users.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses an improved QStE420TM hot-rolled steel plate, which comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si: less than or equal to 0.05 percent, Mn: 0.80-0.90%, P: less than or equal to 0.020%, S: less than or equal to 0.005 percent, Al t: 0.020 to 0.050%, Nb: 0.030 to 0.040%, and the balance being Fe and inevitable impurities;
the main technological parameters are as follows:
(1) the smelting-continuous casting production process flow comprises the following steps: KR desulfurization, converter smelting, LF refining and slab continuous casting;
(2) the tapping temperature of the converter is 1620-1640 ℃; ensuring the coordinated tapping of the components and the temperature;
(3) the hot rolling production process flow comprises the following steps: the method comprises the following steps of heating a furnace, rough rolling high-pressure water descaling, width fixing press, E1R1 rough rolling machine, E2R2 rough rolling machine, heat preservation cover, flying shear, finish rolling high-pressure water descaling, F1-F7 finishing rolling machine, encrypted laminar flow cooling and coiling; the discharging temperature of the casting blank is 1230-1280 ℃, the rough rolling is performed by adopting a 3+3 mode 2 frame rolling mill, and the finish rolling temperature of the rough rolling is 950-1050 ℃; finish rolling is carried out by adopting a 7-frame continuous variable-crown rolling mill, and the thickness of an intermediate blank is 38-45 mm; the finish rolling temperature of the finish rolling is 890 +/-15 ℃; the cooling adopts laminar flow cooling equipment and a front dispersion cooling mode, and the coiling temperature is 590 +/-15 ℃.
Further, the chemical components comprise the following components in percentage by mass: c: 0.07%, Si: 0.03%, Mn: 0.88%, P: 0.017%, S: 0.002%, Alt: 0.031%, Nb: 0.033% and the balance of Fe and inevitable impurities.
Further, the chemical components comprise the following components in percentage by mass: c: 0.07%, Si: 0.03%, Mn: 0.89%, P: 0.012%, S: 0.005%, Alt: 0.036%, Nb: 0.032%, and the balance Fe and inevitable impurities.
Further, the chemical components comprise the following components in percentage by mass: c: 0.07%, Si: 0.02%, Mn: 0.88%, P: 0.012%, S: 0.004%, Alt: 0.031%, Nb: 0.034% and the balance Fe and inevitable impurities.
Further, carrying out desulfurization pretreatment on the molten iron, smelting by adopting a top-bottom combined blown converter to dephosphorize and decarbonize the molten iron to obtain molten steel, blowing argon in the whole smelting process of the converter, adding scrap steel into the converter, and controlling the tapping temperature of the converter to be 1630 ℃; 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 ℃, and carrying out temperature measurement and component fine adjustment by the LF external refining; the superheat degree of continuous casting of the slab is 25 ℃, and then slab cleaning, slow cooling and continuous casting blank quality inspection are carried out; heating the plate blank at 1250 ℃ for 210min, and removing phosphorus from the heated plate blank by high-pressure water; 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 890 ℃, and the thickness of the finished product is 4.5 mm; and (4) carrying out front dispersed cooling by adopting laminar cooling, reducing the temperature of the steel strip to 590 ℃, coiling, and finally carrying out product performance detection.
Further, carrying out desulfurization pretreatment on the 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 1628 ℃ by the converter; 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 ℃, and carrying out temperature measurement and component fine adjustment by the LF external refining; the superheat degree of the continuous casting of the slab is 30 ℃, and then slab cleaning, slow cooling and continuous casting blank quality inspection are carried out; heating the plate blank at 1260 ℃, heating for 210min, and removing phosphorus from the heated plate blank by using high-pressure water; 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 892 ℃, and the thickness of the finished product is 4.5 mm; and the laminar cooling adopts front dispersed cooling, the temperature of the steel strip is reduced to 585 ℃ for coiling, and finally, the product performance is detected.
Further, carrying out desulfurization pretreatment on the 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 controlling the tapping temperature of the converter to be 1638 ℃; 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 ℃, and carrying out temperature measurement and component fine adjustment by the LF external refining; the superheat degree of continuous casting of the slab is 28 ℃, and then slab cleaning, slow cooling and continuous casting blank quality inspection are carried out; heating the plate blank at 1260 ℃, heating for 208min, and removing phosphorus from the heated plate blank by using high-pressure water; 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 895 ℃, and the thickness of the finished product is 4.5 mm; and the laminar cooling adopts front dispersed cooling, the temperature of the steel strip is reduced to 585 ℃ for coiling, and finally, the product performance is detected.
Compared with the prior art, the invention has the beneficial technical effects that:
the metallographic microstructure of the steel grade of the present invention is mainly composed of ferrite and contains a small amount of pearlite. The grain size is between 11 grades and 11.5 grades. After the use test of an automobile factory, the 420 MPa-grade hot rolled steel strip for the steel for the automobile structure, which is produced by the method provided by the invention, has the surface quality and performance indexes meeting the requirements of the relevant technical standards of the automobile factory and meets the use requirements of the relevant automobile factory. 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 microstructure diagram of example 1 of the present invention.
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 method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out dephosphorization and decarburization 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 LF external refining on the molten steel, and carrying out temperature measurement and component fine adjustment, wherein the chemical components of a casting machine for the LF external refining are shown in Table 1. The superheat degree of the continuous casting of the plate blank is 25 ℃, and then the plate blank is cleaned, slowly cooled and the quality of the continuous casting blank is checked. The heating temperature of the plate blank is 1250 ℃, the heating time is 210min, 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 890 ℃, and the thickness of the finished product is 4.5 mm. And (4) carrying out front dispersed cooling by adopting laminar cooling, reducing the temperature of the steel strip to 590 ℃, coiling, and finally carrying out product performance detection. The microstructure is shown in FIG. 1.
Example 2
Performing desulfurization pretreatment on molten iron, performing decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole smelting process of the converter, adding scrap steel into the converter, and tapping at 1628 ℃ by using the converter; then, carrying out LF external refining on the molten steel after the smelting in the converter, wherein the refining in-place temperature is more than or equal to 1560 ℃, and carrying out temperature measurement and fine component adjustment on the LF external refining; the superheat degree of the continuous casting of the plate blank is 30 ℃, and then the plate blank is cleaned, slowly cooled and the quality of the continuous casting blank is checked; heating the plate blank at 1260 ℃, heating for 210min, and carrying out high-pressure water dephosphorization on the heated plate blank; 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 892 ℃, and the thickness of the finished product is 4.5 mm; and the laminar cooling adopts front dispersed cooling, the temperature of the steel strip is reduced to 585 ℃ for coiling, and finally, the product performance is detected.
Example 3
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 smelting process of the converter, adding scrap steel into the converter, and carrying out tapping temperature of the converter of 1638 ℃; then, carrying out LF external refining on the molten steel after the smelting in the converter, wherein the refining in-place temperature is more than or equal to 1560 ℃, and carrying out temperature measurement and fine component adjustment on the LF external refining; the superheat degree of the continuous casting of the plate blank is 28 ℃, and then the plate blank is cleaned, slowly cooled and the quality of the continuous casting blank is checked; heating the plate blank at 1260 ℃, heating for 208min, and carrying out high-pressure water dephosphorization on the heated plate blank; 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 895 ℃, and the thickness of the finished product is 4.5 mm; and the laminar cooling adopts front dispersed cooling, the temperature of the steel strip is reduced to 585 ℃ for coiling, and finally, the product performance is detected.
TABLE 1 chemical composition (wt%) of inventive examples 1 to 3
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
| Examples | Yield strength Rp0.2/MPa | Tensile strength Rm/MPa | Elongation A80/％ |
| Example 1 | 436 | 534 | 27.0 |
| Example 2 | 447 | 550 | 31.0 |
| Example 3 | 451 | 533 | 32.0 |
| Technical protocol | ≥420 | ≥480 | ≥16 |
As can be seen from the data in Table 2, the mechanical properties and the processing properties of the 420 MPa-grade hot rolled steel strip for the steel for the automobile structure, which is produced by the method provided by the invention, meet the requirements of the agreement signed by the user.
The above-mentioned embodiments are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (7)
1. An improved production method of QStE420TM hot-rolled steel plates is characterized in that the QStE420TM hot-rolled steel plates comprise the following chemical components in percentage by mass: c: 0.06-0.08%, Si: less than or equal to 0.05 percent, Mn: 0.80-0.90%, P: less than or equal to 0.020%, S: less than or equal to 0.005 percent, Alt: 0.020 to 0.050%, Nb: 0.030 to 0.040%, and the balance being Fe and inevitable impurities;
the main technological parameters are as follows:
(1) the smelting-continuous casting production process flow comprises the following steps: KR desulfurization, converter smelting, LF refining and slab continuous casting;
(2) the tapping temperature of the converter is 1620-1640 ℃; ensuring the coordinated tapping of the components and the temperature;
(3) the hot rolling production process flow comprises the following steps: the method comprises the following steps of heating a furnace, rough rolling high-pressure water descaling, width fixing press, E1R1 rough rolling mill, E2R2 rough rolling mill, heat preservation cover, flying shear, finish rolling high-pressure water descaling, F1-F7 finishing mill, encryption type laminar cooling and coiling; the discharging temperature of the casting blank is 1230-1280 ℃, the rough rolling is carried out by adopting a 3+3 mode 2 rack rolling mill, and the finish rolling temperature of the rough rolling is 950-1050 ℃; finish rolling is carried out by adopting a 7-frame continuous variable-crown rolling mill, and the thickness of an intermediate blank is 38-45 mm; the finish rolling temperature of finish rolling is 890 +/-15 ℃; the cooling adopts laminar flow cooling equipment and a front dispersion cooling mode, and the coiling temperature is 590 +/-15 ℃.
2. The improved QStE420TM hot rolled steel sheet according to claim 1, characterized in that the chemical composition in mass percent is: c: 0.07%, Si: 0.03%, Mn: 0.88%, P: 0.017%, S: 0.002%, Alt: 0.031%, Nb: 0.033% and the balance of Fe and inevitable impurities.
3. The improved QStE420TM hot rolled steel sheet according to claim 1, characterized in that the chemical composition in mass percent is: c: 0.07%, Si: 0.03%, Mn: 0.89%, P: 0.012%, S: 0.005%, Alt: 0.036%, Nb: 0.032%, and the balance of Fe and inevitable impurities.
4. The improved QStE420TM hot rolled steel sheet according to claim 1, characterized in that the chemical composition in mass percent is: c: 0.07%, Si: 0.02%, Mn: 0.88%, P: 0.012%, S: 0.004%, Alt: 0.031%, Nb: 0.034%, and the balance of Fe and inevitable impurities.
5. The improved QStE420TM hot rolled steel sheet according to claim 1, wherein molten iron is subjected to a desulphurization pretreatment, molten iron is dephosphorized and decarbonized by smelting in a top-bottom combined blown converter to obtain molten steel, argon is blown throughout the smelting in the converter, scrap steel is added into the converter, and the tapping temperature in the converter is 1630 ℃; 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 ℃, and carrying out temperature measurement and component fine adjustment by the LF external refining; the superheat degree of the continuous casting of the plate blank is 25 ℃, and then the plate blank is cleaned, slowly cooled and the quality of the continuous casting blank is checked; heating the plate blank at 1250 ℃ for 210min, and removing phosphorus from the heated plate blank by high-pressure water; 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 890 ℃, and the thickness of the finished product is 4.5 mm; and (4) carrying out front dispersed cooling by adopting laminar cooling, reducing the temperature of the steel strip to 590 ℃, coiling, and finally carrying out product performance detection.
6. The improved QStE420TM hot rolled steel sheet according to claim 1, wherein molten iron is subjected to a desulphurization pretreatment, the molten iron is decarburized and dephosphorized by smelting in a top-bottom combined blown converter to obtain molten steel, argon is blown throughout the smelting in the converter, scrap steel is added into the converter, and the tapping temperature in the converter is 1628 ℃; 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 ℃, and carrying out temperature measurement and component fine adjustment by the LF external refining; the superheat degree of the continuous casting of the plate blank is 30 ℃, and then the plate blank is cleaned, slowly cooled and the quality of the continuous casting blank is checked; heating the plate blank at 1260 ℃, heating for 210min, and carrying out high-pressure water dephosphorization on the heated plate blank; 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 892 ℃, and the thickness of the finished product is 4.5 mm; and the laminar cooling adopts front dispersed cooling, the temperature of the steel strip is reduced to 585 ℃ for coiling, and finally, the product performance is detected.
7. The improved QStE420TM hot rolled steel sheet according to claim 1, wherein molten iron is subjected to a desulphurization pretreatment, the molten iron is decarburized and dephosphorized by smelting in a top-bottom combined blown converter to obtain molten steel, argon is blown throughout the smelting in the converter, scrap steel is added into the converter, and the tapping temperature in the converter is 1638 ℃; 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 ℃, and carrying out temperature measurement and component fine adjustment by the LF external refining; the superheat degree of the continuous casting of the plate blank is 28 ℃, and then the plate blank is cleaned, slowly cooled and the quality of the continuous casting blank is checked; heating the plate blank at 1260 ℃, heating for 208min, and removing phosphorus from the heated plate blank by using high-pressure water; 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 895 ℃, and the thickness of the finished product is 4.5 mm; and the laminar cooling adopts front dispersed cooling, the temperature of the steel strip is reduced to 585 ℃ for coiling, and finally, the product performance is detected.
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| CN115927954A (en) * | 2022-11-02 | 2023-04-07 | 包头钢铁（集团）有限责任公司 | Method for improving impact toughness of weathering resistant steel |
| CN115710677A (en) * | 2022-11-15 | 2023-02-24 | 包头钢铁（集团）有限责任公司 | Method for improving uneven quenching hardness of 75Cr1 saw blade steel |
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Application publication date: 20210702 |