CN110408873B - Surface control method for cold rolling production of 800 MPa-grade DH steel - Google Patents
Surface control method for cold rolling production of 800 MPa-grade DH steel Download PDFInfo
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- CN110408873B CN110408873B CN201910725145.0A CN201910725145A CN110408873B CN 110408873 B CN110408873 B CN 110408873B CN 201910725145 A CN201910725145 A CN 201910725145A CN 110408873 B CN110408873 B CN 110408873B
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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
- C21D8/0205—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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- 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
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- Heat Treatment Of Sheet Steel (AREA)
- Coating With Molten Metal (AREA)
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Abstract
The invention provides a surface control method for cold rolling production of 800 MPa-grade DH steel, which comprises the following steps: hot rolling and coiling the steel billet, cold rolling and galvanizing, wherein the dew point temperature in the furnace is controlled to be-25 ℃ to-40 ℃ in the galvanizing process, and the furnace nose is humidified and closed before the DH steel is produced. By controlling the dew point condition of a furnace area, the humidifying state of a furnace nose and the like, the direction is indicated for solving the color difference problem of the cold-rolled galvanized DH high-strength steel, the color difference defect problem of the galvanized DH high-strength steel is well solved, the product quality is effectively improved, and considerable economic benefits are brought.
Description
Technical Field
The invention belongs to the technical field of metal material processing, and particularly relates to a surface control method for producing 800 MPa-grade DH steel by cold rolling.
Background
A galvanizing production line of first steel cold-rolled sheet limited company mainly has the defects of high-strength strip steel, strip steel offline, chromatic aberration and the like on the surface in the production process. The production of DH steel, influence belted steel surface quality, reduce the product grade, make the economic benefits of company suffer great loss, have seriously influenced normal production rhythm, production line technique and operating personnel's operating condition simultaneously.
In recent years, with the gradual improvement of the surface quality requirements of users on cold-rolled galvanized products, the surface color difference defect of the galvanized DH steel is taken as a typical surface defect, the coating and further deep processing of the users are seriously influenced, and the requirements of high-end cold-rolled sheets are difficult to meet.
Disclosure of Invention
In view of the above, the invention provides a surface control method for cold rolling production of 800 MPa-grade DH steel, which indicates the direction for solving the zinc layer DH steel of a galvanized steel coil and well solves the problem of color difference of galvanized high-strength steel.
A surface control method for cold rolling production of 800 MPa-grade DH steel comprises the following steps: hot rolling and coiling the steel billet, cold rolling and galvanizing, wherein the dew point temperature in the furnace is controlled to be-25 ℃ to-40 ℃ in the galvanizing process, and the furnace nose is humidified and closed before the DH steel is produced.
Preferably, the furnace nose is humidified and closed 3.5 to 4.5 hours before the DH steel is produced.
Preferably, the finishing temperature of the hot rolling is controlled to be 870-910 ℃.
Preferably, the temperature of the curling is controlled to be 630-670 ℃.
Compared with the prior art, the invention has the following advantages: according to the invention, elements such as Mn and the like are converted from external oxidation to internal oxidation by changing the dew point temperature in the furnace and the humidifying condition of the furnace nose after field tracking and a large amount of data acquisition and analysis, so that the effect of no chromatic aberration is achieved in the cold rolling production of 800 MPa-grade DH steel, the improvement of the surface quality of the galvanized high-strength steel product is realized, the product grade is improved, considerable economic benefits are brought, and the method has a good practical application prospect.
Drawings
FIG. 1 is a surface condition diagram of DH steel of 800MPa grade produced by cold rolling obtained in example 1 of the invention.
FIG. 2 is a surface condition diagram of a galvanized DH steel obtained in a comparative example.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited to the following specific examples.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
A surface control method for cold rolling production of 800 MPa-grade DH steel comprises the following steps: hot rolling and coiling the steel billet, cold rolling and galvanizing, wherein the dew point temperature in the furnace is controlled to be-25 ℃ to-40 ℃ in the galvanizing process, and the furnace nose is humidified and closed before the DH steel is produced.
Preferably, in one embodiment of the present invention, the steel billet comprises the following components: c, by mass percent: 0.16-0.18%, Mn: 1.95-2.10%, Si: 0.35-0.45%, P is less than or equal to 0.002%, S is less than or equal to 0.007%, and the balance of Fe and inevitable impurities.
Preferably, the slab is heated before the hot rolling of the slab, and the heating temperature is 1150 to 1290 ℃.
Preferably, the finishing temperature of the hot rolling is controlled to be 870-910 ℃. Compared with the conventional finish rolling temperature, the hot rolling finish rolling temperature adopted by the invention is reduced.
More preferably, in one embodiment of the present invention, the finish rolling temperature of the hot rolling is set to 890 ℃ and the head-to-tail temperature fluctuation of the steel is controlled to 20 ℃ or less in order to control the finish rolling temperature within the above-described range.
Preferably, the temperature of the curling is controlled to be 630-670 ℃. Compared with the conventional coiling, the coiling temperature adopted by the invention is reduced, and the iron oxide scale can be treated more cleanly by matching with the reduction of the coiling temperature, and the effect of improving the color difference in the galvanizing stage is more obvious.
More preferably, in one embodiment of the present invention, the coiling temperature is controlled within the above-mentioned range, the coiling temperature is set to 650 ℃, and the temperature fluctuation of the steel head and tail is controlled within 20 ℃.
Preferably, the hot rolled sheet is pickled before cold rolling, either without pickling or under-pickling.
Preferably, the reduction rate of the cold rolling is controlled to be 50-78%, and the reduction rate is adjusted according to different thicknesses and widths of raw materials.
Preferably, the furnace nose is humidified and closed 3.5 to 4.5 hours before the DH steel is produced. The galvanizing production is continuous production scheduling, namely, according to the production scheduling plan, the furnace nose is humidified and closed 3.5 to 4.5 hours before the DH steel is produced.
The surface control method for producing DH steel of 800MPa grade by cold rolling provided by the application will be explained in detail with reference to the specific embodiment.
Example 1
The embodiment provides a surface control method for producing 800 MPa-grade DH steel by cold rolling, which comprises the following steps:
after the smelting process is finished, the billet is heated at the heating temperature of 1200 ℃. The compositions of the slabs used are shown in table 1.
And then carrying out hot rolling, wherein the final rolling temperature of the hot rolling is set to 890 ℃, and the head and tail temperature fluctuation of the steel is controlled within 20 ℃ so as to ensure that the final rolling temperature of the hot rolling is actually controlled to 870-910 ℃.
And then, curling, wherein the curling temperature is set to 650 ℃, and the head and tail temperature fluctuation of the steel is controlled within 20 ℃ so as to ensure that the actual curling temperature is controlled to be 630-670 ℃.
And cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 60%.
Hot galvanizing, namely humidifying the furnace nose for 4 hours before the DH steel is produced and closing the furnace nose in advance, and controlling the dew point temperature in the furnace to be-30 ℃ in the galvanizing process.
The surface of the obtained 800 MPa-grade DH steel is shown in figure 1, and as can be seen from figure 1, the product has excellent surface quality, no color difference defect, no zinc layer fluctuation and other surface defects.
TABLE 1 billet composition Table
| C | Si | Mn | P，≤ | S，≤ | |
| Determination | 0.160-0.180 | 0.35-0.45 | 1.95-2.10 | 0.020 | 0.007 |
| Target | 0.170 | 0.40 | 2.05 | 0.015 | 0.005 |
Comparative example
The comparative example provides a process for producing DH steel by cold rolling, which comprises the following steps:
after the smelting process is finished, the billet is heated at the heating temperature of 1200 ℃. The steel slab used had the same composition as in example 1, as shown in table 1.
Then hot rolling is carried out, and the final rolling temperature of the hot rolling is 920 ℃.
Then, the temperature for curling was set to 675 ℃.
And cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 60%.
Hot galvanizing, wherein the nose of the DH steel production front furnace is not closed in advance, and the dew point temperature in the furnace is controlled to be-50 ℃ in the galvanizing process.
The surface of the obtained DH steel product is shown in figure 2, and the obvious color difference defect of the surface of the product can be seen from figure 2.
Example 2
The embodiment provides a surface control method for producing 800 MPa-grade DH steel by cold rolling, which comprises the following steps:
after the smelting process is finished, the billet is heated at the heating temperature of 1200 ℃. The steel slab used had the same composition as in example 1, as shown in table 1.
And then hot rolling, wherein the final rolling temperature of the hot rolling is controlled to be 875-895 ℃.
And then curling, wherein the curling temperature is controlled to be 640-660 ℃.
And cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 60%.
Hot galvanizing, namely humidifying the furnace nose for closing in advance 3.5 hours before the DH steel is produced, and controlling the dew point temperature in the furnace to be-35 ℃ in the galvanizing process.
The surface quality of the 800MPa DH steel products is consistent with that of the embodiment 1, and the products have no color difference defects, zinc layer fluctuation and other surface defects.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (3)
1. A surface control method for cold rolling production of 800 MPa-grade DH steel comprises the following steps: hot rolling, curling, cold rolling and galvanizing a steel billet, wherein the dew point temperature in a furnace is controlled to be-25 ℃ to-40 ℃ in the galvanizing process, the furnace nose is humidified and closed 3.5 to 4.5 hours before DH steel is produced, the finish rolling temperature of hot rolling is controlled to be 870 to 910 ℃, the curling temperature is controlled to be 630 to 670 ℃, and the steel billet comprises the following components: c, by mass percent: 0.16-0.18%, Mn: 1.95-2.10%, Si: 0.35-0.45%, P is less than or equal to 0.002%, S is less than or equal to 0.007%, and the balance of Fe and inevitable impurities.
2. The surface control method for cold rolling to produce DH steel of 800MPa grade according to claim 1, characterized by that: the final rolling temperature of the hot rolling is set to be 890 ℃, and the temperature fluctuation of the head and the tail of the steel is controlled within 20 ℃.
3. The surface control method for cold rolling to produce DH steel of 800MPa grade according to claim 1, characterized by that: the curling temperature is set to 650 ℃, and the temperature fluctuation of the head and the tail of the steel is controlled within 20 ℃.
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| CN110408873B true CN110408873B (en) | 2021-09-24 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2290111A1 (en) * | 2009-08-31 | 2011-03-02 | Hyundai Hysco | Dual phase steel sheet and method of manufacturing the same |
| CN102712171A (en) * | 2009-12-21 | 2012-10-03 | 塔塔钢铁艾默伊登有限责任公司 | High strength hot dip galvanised steel strip |
| CN102719751A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | High-strength cold-rolled hot-galvanized dual-phase steel plate and manufacture method thereof |
| CN103160654A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Manufacturing method of ultrahigh strength surface-active steel plate and the steel plate |
| CN108486501A (en) * | 2018-05-15 | 2018-09-04 | 首钢集团有限公司 | A kind of 1000MPa grade cold rolling hot dip galvanizings dual phase steel and its manufacturing method with enhancing plasticity |
| CN109097705A (en) * | 2018-09-26 | 2018-12-28 | 武汉钢铁有限公司 | A kind of 800MPa grade cold rolling hot dip galvanizing dual phase steel and its production method |
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- 2019-08-07 CN CN201910725145.0A patent/CN110408873B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2290111A1 (en) * | 2009-08-31 | 2011-03-02 | Hyundai Hysco | Dual phase steel sheet and method of manufacturing the same |
| CN102712171A (en) * | 2009-12-21 | 2012-10-03 | 塔塔钢铁艾默伊登有限责任公司 | High strength hot dip galvanised steel strip |
| CN102719751A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | High-strength cold-rolled hot-galvanized dual-phase steel plate and manufacture method thereof |
| CN103160654A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Manufacturing method of ultrahigh strength surface-active steel plate and the steel plate |
| CN108486501A (en) * | 2018-05-15 | 2018-09-04 | 首钢集团有限公司 | A kind of 1000MPa grade cold rolling hot dip galvanizings dual phase steel and its manufacturing method with enhancing plasticity |
| CN109097705A (en) * | 2018-09-26 | 2018-12-28 | 武汉钢铁有限公司 | A kind of 800MPa grade cold rolling hot dip galvanizing dual phase steel and its production method |
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