CN115369321A - Economical high-strength hot-galvanized dual-phase steel and manufacturing method thereof - Google Patents
Economical high-strength hot-galvanized dual-phase steel and manufacturing method thereof Download PDFInfo
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- 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
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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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Abstract
The invention discloses economical high-strength hot-galvanized dual-phase steel, which comprises the following chemical components in percentage by mass: less than or equal to 0.18 percent, si: less than or equal to 0.80%, mn: less than or equal to 2.50%, P: not more than 0.080 percent, not more than 0.005 percent of S, 0.020 to 0.060 percent of Alt, not more than 0.30 percent of Cr, not more than 0.030 percent of Nb, ca:0.0010 to 0.0030 percent, and the balance of Fe and inevitable impurities. Its preparing process is also disclosed. The hot-dip galvanized dual-phase steel prepared by the invention has the microstructure of ferrite and martensite, the yield strength is 450-550 MPa, the tensile strength is greater than or equal to 780MPa, the elongation is greater than or equal to 15%, and n is greater than or equal to 0.11, has the characteristics of high strength, low yield ratio, high strain hardening index, good corrosion resistance and the like, and can meet the requirements of light weight and material selection of automobiles.
Description
Technical Field
The invention relates to the technical field of cold-rolled sheet hot galvanizing production, in particular to economical high-strength hot galvanizing dual-phase steel and a manufacturing method thereof.
Background
The hot-dip galvanized dual-phase steel has excellent cold formability, high strain hardening index and good corrosion resistance, is widely applied to manufacturing of parts such as middle-grade and high-grade car structural parts, reinforcements and the like, and has higher requirements on the strength of the hot-dip galvanized dual-phase steel along with the continuous deepening of the light weight, energy conservation and emission reduction of the automobile industry. The traditional 600 MPa-grade hot-galvanized dual-phase steel cannot meet the industrial requirements, and 800 MPa-grade hot-galvanized dual-phase steel is produced at the same time. The improvement of the strength has higher requirement on the hardenability of the material, and cheap silicon and manganese need to be added in the chemical composition design to improve the hardenability, but when the content of the silicon element and the manganese element is too much, the wettability of the steel plate is deteriorated, the platability of the substrate is reduced, and even surface defects such as plating leakage are caused, so that expensive chromium and molybdenum metal is often required to replace part of silicon and manganese to improve the wettability of the substrate, and the addition of the expensive chromium and molybdenum metal inevitably causes cost increase. The invention provides economical high-strength hot-dip galvanized dual-phase steel and a manufacturing method thereof on a continuous hot-dip galvanizing production line with a pre-oxidation function (silicon and manganese in strip steel are subjected to internal oxidation instead of surface oxidation, the wettability of zinc liquid and the platability of a substrate are improved) by a design idea of chemical components of medium carbon, high manganese, low chromium and no molybdenum.
Disclosure of Invention
In order to solve the above-mentioned problems, an object of the present invention is to provide an economical high-strength hot-dip galvanized dual-phase steel and a method for producing the same.
In order to solve the technical problem, the invention adopts the following technical scheme:
the invention relates to economical high-strength hot-dip galvanized dual-phase steel, which comprises the following chemical components in percentage by mass: less than or equal to 0.18 percent, si: less than or equal to 0.80%, mn: less than or equal to 2.50 percent, P: not more than 0.080 percent, not more than 0.005 percent of S, 0.020 to 0.060 percent of Alt, not more than 0.30 percent of Cr, not more than 0.030 percent of Nb, ca:0.0010 to 0.0030 percent, and the balance of Fe and inevitable impurities.
Further, the chemical composition content of the material comprises the following components in percentage by mass: 0.13%, si:0.20%, mn:2.05%, P:0.010%, S0.003%, alt 0.040%, cr 0.25%, nb 0.030%, ca:0.0018 percent, and the balance of Fe and inevitable impurities.
Further, the chemical composition content of the material comprises C:0.13%, si:0.18%, mn:2.10%, P:0.008% of Cu, 0.002% of S, 0.035% of Alt, 0.28% of Cr, 0.025% of Nb, 0.025% of Ca:0.0020 percent, and the balance of Fe and inevitable impurities.
Further, the chemical composition content of the material comprises C:0.14%, si:0.20%, mn:2.10%, P:0.007%, S0.002%, alt 0.045%, cr 0.25%, nb 0.030%, ca:0.0025 percent, and the balance of Fe and inevitable impurities.
Further, the chemical composition content of the material comprises the following components in percentage by mass: 0.15%, si:0.19%, mn:2.08%, P:0.010%, S0.002%, alt 0.040%, cr 0.30%, nb 0.030%, ca:0.0020 percent, and the balance of Fe and inevitable impurities.
Further, the chemical composition content of the material comprises the following components in percentage by mass: 0.15%, si:0.18%, mn:2.15%, P:0.010%, S0.003%, alt 0.040%, cr 0.30%, nb 0.028%, ca:0.0030 percent, and the balance of Fe and inevitable impurities.
A preparation method of economical high-strength hot-dip galvanized dual-phase steel 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 sulfur content of the molten iron entering the converter is required to be less than 0.002 percent, and the slag scarification area of the molten iron is more than 95 percent; the control requirements of the converter end point are as follows: the tapping temperature is more than or equal to 1620 ℃, the coordination of the components and the temperature is ensured for tapping, and the final deoxidation adopts ferro-aluminum for deoxidation; carrying out operations of slagging, deoxidation, desulfurization and inclusion removal in the LF furnace, and adding ferromanganese, ferrosilicon and ferroniobium alloy according to the components of the molten steel to finely adjust the components of the molten steel to a target component range; adjusting the argon flow after alloying to enable the molten steel to be in a soft blowing state, feeding a calcium-silicon wire for calcium treatment, ensuring that the soft blowing time is more than 8min after wire feeding, controlling reasonable argon flow, and preventing the molten steel from being exposed; (ii) a The casting machine 0 adopts constant casting speed control, and the casting speed control range is as follows: 1.0 m/min-1.5 m/min;
(2) The hot rolling production process flow comprises the following steps: heating a casting blank, rough rolling, finish rolling and coiling; the discharging temperature of the casting blank is 1235 +/-20 ℃, the rough rolling is carried out by adopting a 3+3 mode 2-stand rolling mill, and the finish rolling is carried out by adopting a 7-stand continuous variable-crown rolling mill; the rough rolling and final rolling temperature is more than 1020 ℃, the finish rolling starting temperature is 950-1050 ℃, and the finish rolling temperature of the finish rolling is 885 +/-20 ℃; laminar flow cooling equipment is adopted for cooling, a front cooling mode is adopted, and the coiling temperature is 570 +/-30 ℃;
(3) Acid washing cold rolling process flow: pickling the hot-rolled strip steel by a hydrochloric acid tank of an i-BOX technology, removing surface iron scale, and cold-rolling by a cold rolling mill with 5 stands, wherein the cold rolling reduction rate is 50-75%;
(4) The continuous hot galvanizing annealing process flow comprises the following steps: uncoiling a cold and hard coil steel strip, heating to 800 +/-20 ℃, then slowly cooling to 700 +/-20 ℃, then quickly cooling to 460-470 ℃, putting the steel strip into a zinc pot at the temperature of 455-465 ℃, ensuring the temperature of the steel strip at the top of a cooling tower to be less than 250 ℃, ensuring the temperature of an inlet of a water quenching tank to be less than or equal to 160 ℃, ensuring the temperature after drying to be less than or equal to 45 ℃, and ensuring the running speed of the steel strip in a galvanizing furnace area to be 80-120 m/min;
(5) And (3) finishing process: the finishing elongation is set to 0.2 to 0.3%.
Compared with the prior art, the invention has the beneficial technical effects that:
the hot-dip galvanized dual-phase steel prepared by the invention has the microstructure of ferrite and martensite, the yield strength is 450-550 MPa, the tensile strength is greater than or equal to 780MPa, the elongation is greater than or equal to 15%, and n is greater than or equal to 0.11, has the characteristics of high strength, low yield ratio, high strain hardening index, good corrosion resistance and the like, and can meet the requirements of light weight and material selection of automobiles. 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 shows the metallographic structure of example 3.
Detailed Description
The present invention is further described in detail with reference to the following specific examples, which are merely illustrative of the best mode for carrying out the invention and do not limit the scope of the invention in any way.
The chemical composition, main hot rolling process, main annealing process and mechanical properties of examples 1 to 5 of the present invention are specifically shown in tables 1 to 4.
TABLE 1 chemical composition (wt%) of inventive examples 1 to 5
TABLE 2 Hot Rolling Main Process parameters of inventive examples 1 to 5
Table 3 main annealing process parameters of examples 1 to 5 of the present invention
TABLE 4 mechanical Properties of Steel coils according to examples 1 to 5 of the present invention
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to 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. The economical high-strength hot-dip galvanized dual-phase steel is characterized by comprising the following chemical components in percentage by mass: less than or equal to 0.18 percent, si: less than or equal to 0.80 percent, mn: less than or equal to 2.50 percent, P: not more than 0.080 percent, not more than 0.005 percent of S, 0.020 to 0.060 percent of Alt, not more than 0.30 percent of Cr, not more than 0.030 percent of Nb, ca:0.0010 to 0.0030 percent, and the balance of Fe and inevitable impurities.
2. The economical high-strength hot-dip galvanized dual-phase steel according to claim 1, characterized in that the chemical composition content thereof comprises, in mass percent, C:0.13%, si:0.20%, mn:2.05%, P:0.010%, S0.003%, alt 0.040%, cr 0.25%, nb 0.030%, ca:0.0018 percent, and the balance of Fe and inevitable impurities.
3. The economical high-strength hot-dip galvanized dual-phase steel according to claim 1, characterized in that the chemical composition content thereof comprises, in mass percent, C:0.13%, si:0.18%, mn:2.10%, P:0.008% of Cu, 0.002% of S, 0.035% of Alt, 0.28% of Cr, 0.025% of Nb, 0.025% of Ca:0.0020 percent, and the balance of Fe and inevitable impurities.
4. The economical high-strength hot-dip galvanized dual-phase steel according to claim 1, characterized in that the chemical composition content thereof comprises, in mass percent, C:0.14%, si:0.20%, mn:2.10%, P:0.007%, S0.002%, alt 0.045%, cr 0.25%, nb 0.030%, ca:0.0025 percent, and the balance of Fe and inevitable impurities.
5. The economical high-strength hot-dip galvanized dual-phase steel according to claim 1, characterized in that the chemical composition content thereof comprises, in mass percent, C:0.15%, si:0.19%, mn:2.08%, P:0.010%, S0.002%, alt 0.040%, cr 0.30%, nb 0.030%, ca:0.0020 percent, and the balance of Fe and inevitable impurities.
6. The economical high-strength hot-dip galvanized dual-phase steel according to claim 1, characterized in that the chemical composition content thereof comprises, in mass percent, C:0.15%, si:0.18%, mn:2.15%, P:0.010%, S0.003%, alt 0.040%, cr 0.30%, nb 0.028%, ca:0.0030 percent, and the balance of Fe and inevitable impurities.
7. The economical method for producing a high-strength hot-dip galvanized dual-phase steel according to any one of claims 1 to 6, comprising:
(1) The smelting-continuous casting production process flow comprises the following steps: pretreatment of molten iron, converter, LF refining and casting machine; the sulfur content of the molten iron entering the converter is required to be less than 0.002 percent, and the slag scarification area of the molten iron is more than 95 percent; the control requirements of the converter end point are as follows: the tapping temperature is more than or equal to 1620 ℃, the coordinated tapping of components and temperature is ensured, and the final deoxidation adopts ferro-aluminium to deoxidize; carrying out operations of slagging, deoxidation, desulfurization and inclusion removal in the LF furnace, and adding ferromanganese, ferrosilicon and ferroniobium alloy according to the components of the molten steel to finely adjust the components of the molten steel to a target component range; adjusting the argon flow after alloying to enable the molten steel to be in a soft blowing state, feeding a calcium-silicon wire for calcium treatment, ensuring that the soft blowing time is more than 8min after wire feeding, controlling reasonable argon flow, and preventing the molten steel from being exposed; (ii) a The casting machine 0 adopts constant casting speed control, and the casting speed control range is as follows: 1.0 m/min-1.5 m/min;
(2) The hot rolling production process flow comprises the following steps: heating a casting blank, rough rolling, finish rolling and coiling; the discharging temperature of the casting blank is 1235 +/-20 ℃, the rough rolling is carried out by adopting a 3+3 mode 2-stand rolling mill, and the finish rolling is carried out by adopting a 7-stand continuous variable-crown rolling mill; the rough rolling and final rolling temperature is more than 1020 ℃, the finish rolling starting temperature is 950-1050 ℃, and the finish rolling temperature of the finish rolling is 885 +/-20 ℃; the cooling adopts laminar cooling equipment and a front cooling mode, and the coiling temperature is 570 +/-30 ℃;
(3) Acid washing cold rolling process flow: pickling hot-rolled strip steel by using a hydrochloric acid tank of an i-BOX technology, removing surface iron scale, and cold-rolling by using a 5-stand cold rolling mill, wherein the cold-rolling reduction rate is 50-75%;
(4) The continuous hot galvanizing annealing process flow comprises the following steps: uncoiling a cold-hard coil steel strip, heating to 800 +/-20 ℃, then slowly cooling to 700 +/-20 ℃, then quickly cooling to 460-470 ℃, putting the temperature in a zinc pot to be 455-465 ℃, the temperature of the steel strip at the top of a cooling tower to be less than 250 ℃, the temperature at the inlet of a water quenching tank to be less than or equal to 160 ℃, the temperature after drying to be less than or equal to 45 ℃, and the running speed of the steel strip in a galvanizing furnace area to be 80-120 m/min;
(5) And (3) finishing process: the finishing elongation is set to 0.2 to 0.3%.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009144225A (en) * | 2007-12-18 | 2009-07-02 | Jfe Steel Corp | High-strength hot-dip galvanized steel sheet superior in formability and manufacturing method therefor |
| JP2011052317A (en) * | 2009-08-31 | 2011-03-17 | Hyundai Hysco | Dual phase steel sheet and method for manufacturing the same |
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Application publication date: 20221122 |