CN112375971A - Low-cost cold-rolled low-carbon enamel steel and manufacturing method thereof - Google Patents
Low-cost cold-rolled low-carbon enamel steel and manufacturing 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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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- 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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- 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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- C22C33/04—Making ferrous alloys by melting
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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/003—Cementite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention discloses low-cost cold-rolled low-carbon enamel steel which comprises the following chemical components in percentage by mass: c: less than or equal to 0.03%, Si: less than or equal to 0.05 percent, Mn: 0.10-0.30%, P: less than or equal to 0.020%, S: less than or equal to 0.020%, Alt: 0.020-0.050%, N: less than or equal to 0.0050 percent; the balance of Fe and inevitable impurities. Its preparing process is also disclosed. The cold-rolled low-carbon enamel steel has low cost, good formability and scale explosion resistance, meets the manufacturing requirements of enamel parts in the household appliance industry, and meets the requirements of cold-rolled low-carbon steel plates and steel strips for GB/T13790-.
Description
Technical Field
The invention relates to the technical field of metallurgical plate production, in particular to low-cost cold-rolled low-carbon enamel steel and a manufacturing method thereof.
Background
The enamel product is a composite material formed by high-quality steel plate and special function inorganic non-metallic material through the processes of novel electrostatic dry powder enameling and high-temperature sintering, so that firm chemical bonds are generated between the high-quality steel plate and the special function inorganic coating. It has the toughness and shock resistance of steel plate and other base material, and the inorganic enamel layer has the features of high acid and alkali resistance, high durability, high wear resistance, no combustion, easy cleaning, beautiful appearance, no radiation, etc.
Enamel products are widely used in household appliances, kitchen utensils, building enamels, sanitary equipment and the like. With the progress of modern science and technology, new metal materials emerge endlessly, and new enamel materials emerge continuously, so that a plurality of new products are developed in enamel production, and the enamel plays a special role in more fields.
Disclosure of Invention
The cold-rolled low-carbon enamel steel has low cost, good formability and scale explosion resistance, meets the manufacturing requirements of enamel parts in the household appliance industry, and meets the requirements of cold-rolled low-carbon steel plates and steel strips for GB/T13790-.
In order to solve the technical problems, the invention adopts the following technical scheme:
the low-cost cold-rolled low-carbon enamel steel comprises the following chemical components in percentage by mass: c: less than or equal to 0.03%, Si: less than or equal to 0.05 percent, Mn: 0.10-0.30%, P: less than or equal to 0.020%, S: less than or equal to 0.020%, Alt: 0.020-0.050%, N: less than or equal to 0.0050 percent; the balance of Fe and inevitable impurities.
Further, the chemical components comprise the following components in percentage by mass: c: 0.02%, Si: 0.004%, Mn: 0.17%, P: 0.014%, S: 0.007%, Alt: 0.042%, N: 0.0020 percent; the balance of Fe and inevitable impurities.
Further, the chemical components comprise the following components in percentage by mass: c: 0.02%, Si: 0.008%, Mn: 0.18%, P: 0.013%, S: 0.004%, Alt: 0.037%, N: 0.0018%; the balance of Fe and inevitable impurities.
Further, the chemical components comprise the following components in percentage by mass: c: 0.02%, Si: 0.005%, Mn: 0.17%, P: 0.014%, S: 0.005%, Alt: 0.036%, N: 0.0014%; the balance of Fe and inevitable impurities.
A manufacturing method of low-cost cold-rolled low-carbon enamel steel comprises the following steps:
(1) the smelting-continuous casting production process flow comprises the following steps: pretreatment of molten iron, converter, RH refining and casting machine; the molten steel for the casting machine comprises the following components: less than or equal to 0.03%, Si: less than or equal to 0.05 percent, Mn: 0.10-0.30%, P: less than or equal to 0.020%, S: less than or equal to 0.020%, Alt: 0.020-0.050%, N: less than or equal to 0.0050 percent;
(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 1180-1220 ℃, the rough rolling is performed by adopting a 2-frame rolling mill, and the finish rolling is performed by adopting a 7-frame continuous variable-crown rolling mill; the finish rolling temperature of finish rolling is 870-910 ℃, and the thickness of the hot rolled steel strip is 5.5 mm; laminar flow cooling equipment is adopted for cooling, a front dispersive cooling mode is adopted, and the coiling temperature is 700-740 ℃;
(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 cold-rolling reduction rate is 67 percent and the target thickness is 1.8 mm;
(4) the continuous annealing process flow comprises the following steps: uncoiling the cold-hard coil steel strip, wherein the heating and soaking temperature of the annealing process is 750-790 ℃, the slow cooling temperature is 600-700 ℃, the overaging temperature is 300-400 ℃, and the leveling elongation is set to be 1.8%.
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 1660 ℃; then, carrying out RH external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is 1600 ℃, and carrying out temperature measurement and component fine adjustment by the RH external refining; the superheat degree of the slab continuous casting is 33 ℃, and then slab cleaning, slow cooling and quality inspection of the continuous casting slab are carried out; heating the plate blank at 1210 ℃ for 232min, 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 893 ℃, and the thickness of the finished product is 5.5 mm; the laminar cooling adopts pre-dispersion cooling, and the temperature of the steel strip is reduced to 722 ℃ for coiling; pickling the hot-rolled strip steel by a hydrochloric acid tank, wherein the acid tank adopts an i-BOX technology newly developed by MH, the operation and maintenance are greatly simplified, the energy and labor are saved, the hot-rolled strip steel is subjected to cold rolling by a 5-frame UCM rolling mill after the surface iron scale of the hot-rolled strip steel is removed, the cold-rolling reduction rate is 67 percent, and the target thickness is 1.8 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 98m/min, the soaking temperature is 770 ℃, the soaking time is 170S, the slow cooling temperature is 610 ℃, and the flattening elongation is 1.8%.
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 1665 ℃ by using the converter; then, carrying out RH external refining on the molten steel smelted by the converter at the in-place refining temperature of 1612 ℃, and carrying out temperature measurement and component fine adjustment on the RH external refining; the superheat degree of continuous casting of the slab is 31 ℃, and then slab cleaning, slow cooling and quality inspection of the continuous casting slab are carried out; heating the plate blank at 1208 ℃ for 227min, 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 889 ℃, and the thickness of the finished product is 5.5 mm; the laminar cooling adopts pre-dispersion cooling, and the temperature of the steel strip is reduced to 720 ℃ for coiling; pickling the hot-rolled strip steel by a hydrochloric acid tank, wherein the acid tank adopts an i-BOX technology newly developed by MH, the operation and maintenance are greatly simplified, the energy and labor are saved, the hot-rolled strip steel is subjected to cold rolling by a 5-frame UCM rolling mill after the surface iron scale of the hot-rolled strip steel is removed, the cold-rolling reduction rate is 67 percent, and the target thickness is 1.8 mm; the cold and hard coil continuous annealing is carried out in a continuous vertical annealing furnace with HGJC function, the running speed of a steel strip is 90m/min, the soaking temperature is 775 ℃, the soaking time is 188S, the slow cooling temperature is 602 ℃, and the flattening elongation is 1.8%.
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 1667 ℃ by using the converter; then, carrying out RH external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is 1610 ℃, and carrying out temperature measurement and component fine adjustment on the RH external refining; the superheat degree of the continuous casting of the plate blank is 36 ℃, and then the plate blank is cleaned, slowly cooled and the quality of the continuous casting blank is checked; heating the plate blank at 1205 ℃ for 221min, 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 5.5 mm; the laminar cooling adopts pre-dispersion cooling, and the temperature of the steel strip is reduced to 725 ℃ for coiling; pickling the hot-rolled strip steel by a hydrochloric acid tank, wherein the acid tank adopts an i-BOX technology newly developed by MH, the operation and maintenance are greatly simplified, the energy and labor are saved, the hot-rolled strip steel is subjected to cold rolling by a 5-frame UCM rolling mill after the surface iron scale of the hot-rolled strip steel is removed, the cold-rolling reduction rate is 67 percent, and the target thickness is 1.8 mm; the cold and hard coil continuous annealing is carried out in a continuous vertical annealing furnace with HGJC function, the running speed of a steel strip is 102m/min, the soaking temperature is 770 ℃, the soaking time is 166S, the slow cooling temperature is 612 ℃, and the flat elongation is 1.8%.
Compared with the prior art, the invention has the beneficial technical effects that:
the metallographic microstructure of the cold-rolled enamel steel is ferrite and cementite, the grain size is 8-10 grades, the yield strength is 170-210 MPa, the tensile strength is 300-330 MPa, and the elongation A is8040 to 46 percent. The cold-rolled low-carbon enamel steel produced by the method provided by the invention is used by stamping of household appliances enterprises, the surface quality and the process performance both meet the requirements of related technical standards, and the use requirements of users are met. 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
A low-cost cold-rolled low-carbon enamel steel is prepared through desulfurizing molten iron, smelting in top-bottom combined blowing converter to decarbonize and dephosphorize molten iron to obtain molten steel, blowing argon in converter, adding waste steel to converter, and tapping at 1660 deg.C. And then, carrying out RH external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is 1600 ℃, the RH external refining carries out temperature measurement and component fine adjustment, and the chemical components of the casting machine for RH external refining are shown in Table 1. The superheat degree of the slab continuous casting is 33 ℃, 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 232min, 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 893 ℃, and the thickness of the finished product is 5.5 mm. And the laminar cooling adopts pre-dispersion cooling, and the temperature of the steel strip is reduced to 722 ℃ 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 67 percent, and the target thickness is 1.8 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 98m/min, the soaking temperature is 770 ℃, the soaking time is 170S, the slow cooling temperature is 610 ℃, and the flattening elongation is 1.8%. And finally, detecting the product performance. The microstructure of the product is shown in FIG. 1.
Example 2
A low-cost cold-rolled low-carbon enamel steel is prepared through desulfurizing molten iron, smelting in top-bottom combined blowing converter to decarbonize and dephosphorize molten iron to obtain molten steel, blowing argon in converter, adding waste steel to converter, and tapping at 1665 deg.C. And then, carrying out RH external refining on the molten steel smelted by the converter at the in-place refining temperature of 1612 ℃, carrying out temperature measurement and component fine adjustment on the RH external refining, wherein the chemical components of the casting machine for RH external refining are shown in Table 1. The superheat degree of the continuous casting of the slab is 31 ℃, and then slab cleaning, slow cooling and continuous casting slab quality inspection are carried out. And (3) heating the plate blank at 1208 ℃, heating for 227min, 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 889 ℃, and the thickness of the finished product is 5.5 mm. And adopting front dispersed cooling for laminar cooling, and reducing the temperature of the steel strip to 720 ℃ 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 67 percent, and the target thickness is 1.8 mm. The cold and hard coil continuous annealing is carried out in a continuous vertical annealing furnace with HGJC function, the running speed of a steel strip is 90m/min, the soaking temperature is 775 ℃, the soaking time is 188S, the slow cooling temperature is 602 ℃, and the flattening elongation is 1.8%. And finally, detecting the product performance.
Example 3
A low-cost cold-rolled low-carbon enamel steel is prepared through desulfurizing molten iron, smelting in top-bottom combined blowing converter to decarbonize and dephosphorize molten iron to obtain molten steel, blowing argon in converter, adding waste steel to converter, and tapping at 1667 deg.C. And then, carrying out RH external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is 1610 ℃, carrying out temperature measurement and component fine adjustment on the RH external refining, and the chemical components of the casting machine for RH external refining are shown in Table 1. The superheat degree of the continuous casting of the slab is 36 ℃, and then slab cleaning, slow cooling and continuous casting slab quality inspection are carried out. Heating the plate blank at 1205 ℃ for 221min, 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 895 ℃, and the thickness of the finished product is 5.5 mm. And adopting front dispersed cooling for laminar cooling, and reducing the temperature of the steel strip to 725 ℃ 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 67 percent, and the target thickness is 1.8 mm. The cold and hard coil continuous annealing is carried out in a continuous vertical annealing furnace with HGJC function, the running speed of a steel strip is 102m/min, the soaking temperature is 770 ℃, the soaking time is 166S, the slow cooling temperature is 612 ℃, and the flat elongation is 1.8%. And finally, detecting the product performance.
TABLE 1 chemical composition (wt%) of inventive examples 1 to 3
| Examples | C | Si | Mn | P | S | Alt | N |
| 1 | 0.02 | 0.004 | 0.17 | 0.014 | 0.007 | 0.042 | 0.0020 |
| 2 | 0.02 | 0.008 | 0.18 | 0.013 | 0.004 | 0.037 | 0.0018 |
| 3 | 0.02 | 0.005 | 0.17 | 0.014 | 0.005 | 0.036 | 0.0014 |
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
In the examples in Table 2, a enameling test is adopted, the enameling temperature is 800-900 ℃, the steel plate is placed for 10 days after cooling, and the fishscale resistance of the steel plate is tested.
As can be seen from Table 2, the mechanical properties of the cold-rolled low-carbon enamel steel produced by the method are obviously superior to the performance requirements of cold-rolled low-carbon steel DC01EK for enamel in the national standard GB/T13790-2008.
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 (8)
1. The low-cost cold-rolled low-carbon enamel steel is characterized by comprising the following chemical components in percentage by mass: c: less than or equal to 0.03%, Si: less than or equal to 0.05 percent, Mn: 0.10-0.30%, P: less than or equal to 0.020%, S: less than or equal to 0.020%, Alt: 0.020-0.050%, N: less than or equal to 0.0050 percent; the balance of Fe and inevitable impurities.
2. The low-cost cold-rolled low-carbon enamel steel as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by mass: c: 0.02%, Si: 0.004%, Mn: 0.17%, P: 0.014%, S: 0.007%, Alt: 0.042%, N: 0.0020 percent; the balance of Fe and inevitable impurities.
3. The low-cost cold-rolled low-carbon enamel steel as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by mass: c: 0.02%, Si: 0.008%, Mn: 0.18%, P: 0.013%, S: 0.004%, Alt: 0.037%, N: 0.0018%; the balance of Fe and inevitable impurities.
4. The low-cost cold-rolled low-carbon enamel steel as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by mass: c: 0.02%, Si: 0.005%, Mn: 0.17%, P: 0.014%, S: 0.005%, Alt: 0.036%, N: 0.0014%; the balance of Fe and inevitable impurities.
5. The method for manufacturing low-cost cold-rolled low-carbon enamel steel 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, RH refining and casting machine; the molten steel for the casting machine comprises the following components: less than or equal to 0.03%, Si: less than or equal to 0.05 percent, Mn: 0.10-0.30%, P: less than or equal to 0.020%, S: less than or equal to 0.020%, Alt: 0.020-0.050%, N: less than or equal to 0.0050 percent;
(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 1180-1220 ℃, the rough rolling is performed by adopting a 2-frame rolling mill, and the finish rolling is performed by adopting a 7-frame continuous variable-crown rolling mill; the finish rolling temperature of finish rolling is 870-910 ℃, and the thickness of the hot rolled steel strip is 5.5 mm; laminar flow cooling equipment is adopted for cooling, a front dispersive cooling mode is adopted, and the coiling temperature is 700-740 ℃;
(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 cold-rolling reduction rate is 67 percent and the target thickness is 1.8 mm;
(4) the continuous annealing process flow comprises the following steps: uncoiling the cold-hard coil steel strip, wherein the heating and soaking temperature of the annealing process is 750-790 ℃, the slow cooling temperature is 600-700 ℃, the overaging temperature is 300-400 ℃, and the leveling elongation is set to be 1.8%.
6. The manufacturing method of claim 5, wherein the molten iron is subjected to a desulfurization pretreatment, the molten iron is decarburized and dephosphorized by smelting in a top-bottom combined blown converter to obtain molten iron, argon is blown during the whole smelting process in the converter, scrap steel is added into the converter, and the tapping temperature of the converter is 1660 ℃; then, carrying out RH external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is 1600 ℃, and carrying out temperature measurement and component fine adjustment by the RH external refining; the superheat degree of the slab continuous casting is 33 ℃, and then slab cleaning, slow cooling and quality inspection of the continuous casting slab are carried out; heating the plate blank at 1210 ℃ for 232min, 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 893 ℃, and the thickness of the finished product is 5.5 mm; the laminar cooling adopts pre-dispersion cooling, and the temperature of the steel strip is reduced to 722 ℃ for coiling; the hot-rolled strip steel is pickled by a hydrochloric acid tank, the acid tank adopts an i-BOX technology developed by MH, the operation and maintenance are greatly simplified, the energy and labor 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 67 percent, and the hot-rolled strip steel is rolled to the target thickness of 1.8 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 98m/min, the soaking temperature is 770 ℃, the soaking time is 170S, the slow cooling temperature is 610 ℃, and the flattening elongation is 1.8%.
7. The manufacturing method of claim 5, wherein the molten iron is subjected to a desulfurization pretreatment, the molten iron is decarburized and dephosphorized by smelting in a top-bottom combined blown converter to obtain molten iron, argon is blown during the whole smelting process in the converter, scrap steel is added into the converter, and the tapping temperature of the converter is 1665 ℃; then, carrying out RH external refining on the molten steel smelted by the converter at the in-place refining temperature of 1612 ℃, and carrying out temperature measurement and component fine adjustment on the RH external refining; the superheat degree of continuous casting of the slab is 31 ℃, and then slab cleaning, slow cooling and quality inspection of the continuous casting slab are carried out; heating the plate blank at 1208 ℃ for 227min, 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 889 ℃, and the thickness of the finished product is 5.5 mm; the laminar cooling adopts pre-dispersion cooling, and the temperature of the steel strip is reduced to 720 ℃ for coiling; the hot-rolled strip steel is pickled by a hydrochloric acid tank, the acid tank adopts an i-BOX technology developed by MH, the operation and maintenance are greatly simplified, the energy and labor 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 67 percent, and the hot-rolled strip steel is rolled to the target thickness of 1.8 mm; the cold and hard coil continuous annealing is carried out in a continuous vertical annealing furnace with HGJC function, the running speed of a steel strip is 90m/min, the soaking temperature is 775 ℃, the soaking time is 188S, the slow cooling temperature is 602 ℃, and the flattening elongation is 1.8%.
8. The manufacturing method of claim 5, wherein the molten iron is subjected to a desulfurization pretreatment, the molten iron is decarburized and dephosphorized by smelting in a top-bottom combined blown converter to obtain molten iron, argon is blown during the whole smelting process in the converter, scrap steel is added into the converter, and the tapping temperature of the converter is 1667 ℃; then, carrying out RH external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is 1610 ℃, and carrying out temperature measurement and component fine adjustment on the RH external refining; the superheat degree of the continuous casting of the plate blank is 36 ℃, and then the plate blank is cleaned, slowly cooled and the quality of the continuous casting blank is checked; heating the plate blank at 1205 ℃ for 221min, 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 5.5 mm; the laminar cooling adopts pre-dispersion cooling, and the temperature of the steel strip is reduced to 725 ℃ for coiling; the hot-rolled strip steel is pickled by a hydrochloric acid tank, the acid tank adopts an i-BOX technology developed by MH, the operation and maintenance are greatly simplified, the energy and labor 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 67 percent, and the hot-rolled strip steel is rolled to the target thickness of 1.8 mm; the cold and hard coil continuous annealing is carried out in a continuous vertical annealing furnace with HGJC function, the running speed of a steel strip is 102m/min, the soaking temperature is 770 ℃, the soaking time is 166S, the slow cooling temperature is 612 ℃, and the flat elongation is 1.8%.
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