CN110157979B - Rolling method for improving surface quality of steel plate - Google Patents
Rolling method for improving surface quality of steel plate Download PDFInfo
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- CN110157979B CN110157979B CN201910374287.7A CN201910374287A CN110157979B CN 110157979 B CN110157979 B CN 110157979B CN 201910374287 A CN201910374287 A CN 201910374287A CN 110157979 B CN110157979 B CN 110157979B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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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
- B21B45/004—Heating 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
- B21B45/04—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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
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Abstract
The invention discloses a rolling method for improving the surface quality of a steel plate, which comprises the following chemical components in percentage by mass: c: 0.02-0.30%, Si is less than or equal to 0.15%, Mn: 0.30-2.20%, P is less than or equal to 0.020%, S is less than or equal to 0.0050%, Ni is less than or equal to 0.30%, Nb is less than or equal to 0.070%, Cu is less than or equal to 0.50%, N is less than or equal to 0.0050%, and Ti: 0.006-0.020%, Cr is less than or equal to 0.30%, Al: 0.015-0.050% and the balance of Fe and impurities. Reasonable component design and rolling temperature and cooling temperature schedule are set, the generation amount and the generation thickness of the iron scale are reduced, and the surface quality judgment rate is reduced from 0.53 to 0.31 percent.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a rolling method for improving the surface quality of a steel plate.
Background
Along with the increasingly white and hot competition of domestic markets, the requirements of customers on the quality of steel plates are more and more strict, the requirements of industries such as engineering machinery, ship building and the like on the surface quality of the steel plates are very strict, wherein the requirements of the steel plates for Kate and luxury cruise ship on the surface are extremely high, the macroscopic surface roughness caused by the falling of pressed iron scales is not allowed, the water ripple generated in the manufacturing process is not allowed, and the pockmarked pitted surface of the whole steel plate is not allowed. The quality of the steel plate can be improved by changing the rolling process, but the effect of the existing rolling technology on improving the quality of the steel plate is not obvious.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides 1. a rolling method for improving the surface quality of a steel sheet,
s1, the chemical components and the mass percentage are as follows: c: 0.02-0.30%, Si is less than or equal to 0.15%, Mn: 0.30-2.20%, P is less than or equal to 0.020%, S is less than or equal to 0.0050%, Ni is less than or equal to 0.30%, Nb is less than or equal to 0.070%, Cu is less than or equal to 0.50%, N is less than or equal to 0.0050%, and Ti: 0.006-0.020%, Cr is less than or equal to 0.30%, Al: 0.015 to 0.050 percent, and the balance of Fe and impurities;
s2, after the surface of the blank is qualified, the blank is sent to a stepping heating furnace to be heated, the heating time is 11-13 min/cm, the soaking time is more than or equal to 50min, and the target tapping temperature is 1100-1110 ℃;
s3, the blank moves forward at a speed of 3m/S after being taken out of the heating furnace, the blank is subjected to rough descaling in a descaling box, the descaling pressure is 22-25 MPa, and the blank is subjected to rough rolling in a rolling mill at a speed of 3m/S after the descaling is finished;
s4, carrying out descaling operation on the two times before rough rolling at the rough rolling initial rolling temperature of 1060-1080 ℃, and descaling the second time after widening when the all-longitudinal rolling pass after widening is more than or equal to three times, wherein the descaling pressure is 22-25 MPa;
s5, performing two-stage controlled rolling, wherein the thickness of the blank to be heated is set to be 2.0-3.0 times, the two-stage rolling temperature is set to be 800-960 ℃, and the finishing rolling temperature is set to be 780-880 ℃;
s6, after the steel plate is rolled, throwing the steel at the speed of 4.8-5.2 m/S, pre-straightening, and then cooling in water, wherein the water inlet temperature meets Ar320-30 ℃ and the temperature of red return is 450-700 ℃;
and S7, cooling the steel plate by a cooling bed, performing temperature straightening, cutting, marking, detecting, inspecting, and warehousing.
The technical effects are as follows: the invention starts from the principle of the iron scale generated in the rolling process, deeply solves the problem of influencing the surface quality of steel and effectively improves the surface quality of the steel plate. The secondary oxidation of the surface of the steel plate is reduced through reasonable component design to form scale (such as olivine) which is difficult to remove, the thickness of the scale influenced by the blank adding process, rolling and descaling, and cooling temperature and speed is weakened through the improvement of the rolling and cooling process, and the high-surface-quality steel plate which is thin, compact and difficult to damage and has high surface smoothness and no rough surface and water ripple is obtained.
The technical scheme of the invention is further defined as follows:
the rolling method for improving the surface quality of the steel plate,
s1, the chemical components and the mass percentage are as follows: c: 0.02-0.30%, Si is less than or equal to 0.15%, Mn: 0.30-2.20%, P is less than or equal to 0.020%, S is less than or equal to 0.0050%, Ni is less than or equal to 0.30%, Nb is less than or equal to 0.070%, Cu is less than or equal to 0.50%, N is less than or equal to 0.0050%, and Ti: 0.006-0.020%, Cr is less than or equal to 0.30%, Al: 0.015 to 0.050 percent, and the balance of Fe and impurities;
s2, after the blank is qualified, sending the blank to a stepping heating furnace for heating, wherein the thickness specification is 18mm, the heating time is 12.1min/cm, the soaking time is 53min, and the target tapping temperature is 1106 ℃;
s3, the blank moves forward at the speed of 3m/S after being taken out of the heating furnace, the blank is roughly descaled in a descaling box, the descaling pressure is 23MPa, and rough rolling is carried out on the blank in a rolling mill at the speed of 3m/S after the descaling is finished;
s4, carrying out rough rolling initial rolling temperature of 1078 ℃, carrying out descaling operation on two times before rough rolling, and carrying out descaling on the second time of the widened full longitudinal rolling when the widened full longitudinal rolling time is more than or equal to three times, wherein the descaling pressure is 23 MPa;
s5, performing two-stage controlled rolling, setting the thickness of the blank to be heated to be 2.3 times, setting the temperature of the two-stage rolling to be 860 ℃, and properly reducing the second opening temperature according to the rolling thickness of the steel plate, so that the surface quality of the steel plate can be effectively improved; the finishing temperature is set to be 830 ℃, and the surface quality is favorably improved by properly reducing the finishing temperature;
s6, after the steel plate is rolled, throwing steel at the speed of 4.9m/S, pre-straightening, and then cooling in water, wherein the water inlet temperature meets 788 ℃, and the temperature of re-reddening is 630 ℃;
and S7, cooling the steel plate by a cooling bed, performing temperature straightening, cutting, marking, detecting, inspecting, and warehousing.
The rolling method for improving the surface quality of the steel plate,
s1, the chemical components and the mass percentage are as follows: c: 0.02-0.30%, Si is less than or equal to 0.15%, Mn: 0.30-2.20%, P is less than or equal to 0.020%, S is less than or equal to 0.0050%, Ni is less than or equal to 0.30%, Nb is less than or equal to 0.070%, Cu is less than or equal to 0.50%, N is less than or equal to 0.0050%, and Ti: 0.006-0.020%, Cr is less than or equal to 0.30%, Al: 0.015 to 0.050 percent, and the balance of Fe and impurities;
s2, after the blank is qualified, conveying the blank to a stepping heating furnace for heating, wherein the thickness specification is 11mm, the heating time is 11.3min/cm, the soaking time is 51min, and the target tapping temperature is 1102 ℃;
s3, the blank moves forward at the speed of 3m/S after being taken out of the heating furnace, the blank is roughly descaled in a descaling box, the descaling pressure is 22MPa, and rough rolling is carried out on the blank in a rolling mill at the speed of 3m/S after the descaling is finished;
s4, the rough rolling starting temperature is 1066 ℃, descaling operation is carried out on the two times before rough rolling, when the widened full longitudinal rolling pass is more than or equal to three times, descaling is carried out on the widened full longitudinal rolling pass for the second time, and the descaling pressure is 24 MPa;
s5, performing two-stage controlled rolling, wherein the thickness of the blank to be heated is set to be 2.2 times, the temperature of the two-stage rolling is set to be 930 ℃, and the second opening temperature is properly reduced according to the rolling thickness of the steel plate, so that the surface quality of the steel plate can be effectively improved; the finish rolling temperature is set to be 870 ℃, and the improvement of the surface quality is facilitated by properly reducing the finish rolling temperature;
s6, after the steel plate is rolled, throwing steel at the speed of 5.1m/S, pre-straightening, and then cooling in water, wherein the water inlet temperature meets 781 ℃, and the red return temperature is 690 ℃;
and S7, cooling the steel plate by a cooling bed, performing temperature straightening, cutting, marking, detecting, inspecting, and warehousing.
The invention has the beneficial effects that:
(1) the invention reduces the content of surface easily-oxidized elements (Si, Nb, Ti, Cu and the like) through component design, and ensures uniform thickness of the scale on the surface of the steel plate;
(2) according to the invention, the thickness of the oxidized iron scale of the secondary oxidation is effectively reduced by the low-temperature heating process of the heating furnace, the surface removal rate is high after the descaling operation, the damage is not easy to cause, the surface color of the steel plate is consistent, and the surface quality of the steel plate is effectively improved;
(3) according to the invention, secondary oxidation is inevitably formed in the rolling process of the steel plate under the influence of the rolling speed, the descaling procedure and other procedures, the thickness of the scale is effectively reduced by reducing the initial rolling temperature and optimizing the descaling pass, and the descaling mode effectively improves the removal capacity; the adoption of two-stage rolling is crucial to the improvement of the surface quality of the steel plate, so that the rolling temperature is reduced, and the finish rolling force is effectively reduced by setting the temperature of the blank to be heated, thereby reducing the probability of secondary oxidation, reducing the damage degree, and effectively protecting and improving the stability of the surface quality;
(4) the steel throwing speed is set, so that the friction damage probability between the steel plate and the roller way is reduced, the water inlet temperature and the red returning temperature are set, the surface unevenness of the steel plate is ensured, and the damage of iron scales in the temperature straightening process is avoided.
Drawings
FIG. 1 is a schematic view of a high surface quality steel sheet according to example 1.
Detailed Description
Example 1
The embodiment provides a rolling method for improving the surface quality of a steel plate,
s1, the chemical components and the mass percentage are as follows: c: 0.02-0.30%, Si is less than or equal to 0.15%, Mn: 0.30-2.20%, P is less than or equal to 0.020%, S is less than or equal to 0.0050%, Ni is less than or equal to 0.30%, Nb is less than or equal to 0.070%, Cu is less than or equal to 0.50%, N is less than or equal to 0.0050%, and Ti: 0.006-0.020%, Cr is less than or equal to 0.30%, Al: 0.015 to 0.050 percent, and the balance of Fe and impurities;
s2, after the blank is qualified, sending the blank to a stepping heating furnace for heating, wherein the thickness specification is 18mm, the heating time is 12.1min/cm, the soaking time is 53min, and the target tapping temperature is 1106 ℃;
s3, the blank moves forward at the speed of 3m/S after being taken out of the heating furnace, the blank is roughly descaled in a descaling box, the descaling pressure is 23MPa, and rough rolling is carried out on the blank in a rolling mill at the speed of 3m/S after the descaling is finished;
s4, carrying out rough rolling initial rolling temperature of 1078 ℃, carrying out descaling operation on two times before rough rolling, and carrying out descaling on the second time of the widened full longitudinal rolling when the widened full longitudinal rolling time is more than or equal to three times, wherein the descaling pressure is 23 MPa;
s5, performing two-stage controlled rolling, setting the thickness of the blank to be heated to be 2.3 times, setting the temperature of the two-stage rolling to be 860 ℃, and properly reducing the second opening temperature according to the rolling thickness of the steel plate, so that the surface quality of the steel plate can be effectively improved; the finishing temperature is set to be 830 ℃, and the surface quality is favorably improved by properly reducing the finishing temperature;
s6, after the steel plate is rolled, throwing steel at the speed of 4.9m/S, pre-straightening, and then cooling in water, wherein the water inlet temperature meets 788 ℃, and the temperature of re-reddening is 630 ℃;
and S7, cooling the steel plate by a cooling bed, performing temperature straightening, cutting, marking, detecting, inspecting, and warehousing.
Example 2
The embodiment provides a rolling method for improving the surface quality of a steel plate,
s1, the chemical components and the mass percentage are as follows: c: 0.02-0.30%, Si is less than or equal to 0.15%, Mn: 0.30-2.20%, P is less than or equal to 0.020%, S is less than or equal to 0.0050%, Ni is less than or equal to 0.30%, Nb is less than or equal to 0.070%, Cu is less than or equal to 0.50%, N is less than or equal to 0.0050%, and Ti: 0.006-0.020%, Cr is less than or equal to 0.30%, Al: 0.015 to 0.050 percent, and the balance of Fe and impurities;
s2, after the blank is qualified, conveying the blank to a stepping heating furnace for heating, wherein the thickness specification is 11mm, the heating time is 11.3min/cm, the soaking time is 51min, and the target tapping temperature is 1102 ℃;
s3, the blank moves forward at the speed of 3m/S after being taken out of the heating furnace, the blank is roughly descaled in a descaling box, the descaling pressure is 22MPa, and rough rolling is carried out on the blank in a rolling mill at the speed of 3m/S after the descaling is finished;
s4, the rough rolling starting temperature is 1066 ℃, descaling operation is carried out on the two times before rough rolling, when the widened full longitudinal rolling pass is more than or equal to three times, descaling is carried out on the widened full longitudinal rolling pass for the second time, and the descaling pressure is 24 MPa;
s5, performing two-stage controlled rolling, wherein the thickness of the blank to be heated is set to be 2.2 times, the temperature of the two-stage rolling is set to be 930 ℃, and the second opening temperature is properly reduced according to the rolling thickness of the steel plate, so that the surface quality of the steel plate can be effectively improved; the finish rolling temperature is set to be 870 ℃, and the improvement of the surface quality is facilitated by properly reducing the finish rolling temperature;
s6, after the steel plate is rolled, throwing steel at the speed of 5.1m/S, pre-straightening, and then cooling in water, wherein the water inlet temperature meets 781 ℃, and the red return temperature is 690 ℃;
and S7, cooling the steel plate by a cooling bed, performing temperature straightening, cutting, marking, detecting, inspecting, and warehousing.
As shown in FIG. 1, the method can obtain a high-quality steel plate with a thin, dense and hard-to-break iron scale formed on the surface, high surface smoothness, no pitted surface and no water ripple. The annual surface failure incidence rate is reduced from 0.53 percent to 0.31 percent, the surface quality is obviously improved, and the cost gain reducing effect is obvious.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (3)
1. A rolling method for improving the surface quality of a steel plate is characterized by comprising the following steps:
s1, the chemical components and the mass percentage are as follows: c: 0.02-0.30%, Si is less than or equal to 0.15%, Mn: 0.30-2.20%, P is less than or equal to 0.020%, S is less than or equal to 0.0050%, Ni is less than or equal to 0.30%, Nb is less than or equal to 0.070%, Cu is less than or equal to 0.50%, N is less than or equal to 0.0050%, and Ti: 0.006-0.020%, Cr is less than or equal to 0.30%, Al: 0.015 to 0.050 percent, and the balance of Fe and impurities;
s2, after the surface of the blank is qualified, the blank is sent to a stepping heating furnace to be heated, the heating time is 11-13 min/cm, the soaking time is more than or equal to 50min, and the target tapping temperature is 1100-1110 ℃;
s3, the blank moves forward at a speed of 3m/S after being taken out of the heating furnace, the blank is subjected to rough descaling in a descaling box, the descaling pressure is 22-25 MPa, and the blank is subjected to rough rolling in a rolling mill at a speed of 3m/S after the descaling is finished;
s4, carrying out descaling operation on the two times before rough rolling at the rough rolling initial rolling temperature of 1060-1080 ℃, and descaling the second time after widening when the all-longitudinal rolling pass after widening is more than or equal to three times, wherein the descaling pressure is 22-25 MPa;
s5, performing two-stage controlled rolling, wherein the thickness of the blank to be heated is set to be 2.0-3.0 times, the two-stage rolling temperature is set to be 800-960 ℃, and the finishing rolling temperature is set to be 780-880 ℃;
s6, after the steel plate is rolled, throwing the steel at the speed of 4.8-5.2 m/S, pre-straightening, and then cooling in water, wherein the water inlet temperature meets Ar320-30 ℃ and the temperature of red return is 450-700 ℃;
and S7, cooling the steel plate by a cooling bed, performing temperature straightening, cutting, marking, detecting, inspecting, and warehousing.
2. The rolling method for improving the surface quality of a steel sheet according to claim 1, wherein:
s1, the chemical components and the mass percentage are as follows: c: 0.02-0.30%, Si is less than or equal to 0.15%, Mn: 0.30-2.20%, P is less than or equal to 0.020%, S is less than or equal to 0.0050%, Ni is less than or equal to 0.30%, Nb is less than or equal to 0.070%, Cu is less than or equal to 0.50%, N is less than or equal to 0.0050%, and Ti: 0.006-0.020%, Cr is less than or equal to 0.30%, Al: 0.015 to 0.050 percent, and the balance of Fe and impurities;
s2, after the blank is qualified, sending the blank to a stepping heating furnace for heating, wherein the thickness specification is 18mm, the heating time is 12.1min/cm, the soaking time is 53min, and the target tapping temperature is 1106 ℃;
s3, the blank moves forward at the speed of 3m/S after being taken out of the heating furnace, the blank is roughly descaled in a descaling box, the descaling pressure is 23MPa, and rough rolling is carried out on the blank in a rolling mill at the speed of 3m/S after the descaling is finished;
s4, carrying out rough rolling initial rolling temperature of 1078 ℃, carrying out descaling operation on two times before rough rolling, and carrying out descaling on the second time of the widened full longitudinal rolling when the widened full longitudinal rolling time is more than or equal to three times, wherein the descaling pressure is 23 MPa;
s5, performing two-stage controlled rolling, setting the thickness of the blank to be heated to be 2.3 times, setting the temperature of the two-stage rolling to be 860 ℃, and properly reducing the second opening temperature according to the rolling thickness of the steel plate, so that the surface quality of the steel plate can be effectively improved; the finishing temperature is set to be 830 ℃, and the surface quality is favorably improved by properly reducing the finishing temperature;
s6, after the steel plate is rolled, throwing steel at the speed of 4.9m/S, pre-straightening, and then cooling in water, wherein the water inlet temperature meets 788 ℃, and the temperature of re-reddening is 630 ℃;
and S7, cooling the steel plate by a cooling bed, performing temperature straightening, cutting, marking, detecting, inspecting, and warehousing.
3. The rolling method for improving the surface quality of a steel sheet according to claim 1, wherein:
s1, the chemical components and the mass percentage are as follows: c: 0.02-0.30%, Si is less than or equal to 0.15%, Mn: 0.30-2.20%, P is less than or equal to 0.020%, S is less than or equal to 0.0050%, Ni is less than or equal to 0.30%, Nb is less than or equal to 0.070%, Cu is less than or equal to 0.50%, N is less than or equal to 0.0050%, and Ti: 0.006-0.020%, Cr is less than or equal to 0.30%, Al: 0.015 to 0.050 percent, and the balance of Fe and impurities;
s2, after the blank is qualified, conveying the blank to a stepping heating furnace for heating, wherein the thickness specification is 11mm, the heating time is 11.3min/cm, the soaking time is 51min, and the target tapping temperature is 1102 ℃;
s3, the blank moves forward at the speed of 3m/S after being taken out of the heating furnace, the blank is roughly descaled in a descaling box, the descaling pressure is 22MPa, and rough rolling is carried out on the blank in a rolling mill at the speed of 3m/S after the descaling is finished;
s4, the rough rolling starting temperature is 1066 ℃, descaling operation is carried out on the two times before rough rolling, when the widened full longitudinal rolling pass is more than or equal to three times, descaling is carried out on the widened full longitudinal rolling pass for the second time, and the descaling pressure is 24 MPa;
s5, performing two-stage controlled rolling, wherein the thickness of the blank to be heated is set to be 2.2 times, the temperature of the two-stage rolling is set to be 930 ℃, and the second opening temperature is properly reduced according to the rolling thickness of the steel plate, so that the surface quality of the steel plate can be effectively improved; the finish rolling temperature is set to be 870 ℃, and the improvement of the surface quality is facilitated by properly reducing the finish rolling temperature;
s6, after the steel plate is rolled, throwing steel at the speed of 5.1m/S, pre-straightening, and then cooling in water, wherein the water inlet temperature meets 781 ℃, and the red return temperature is 690 ℃;
and S7, cooling the steel plate by a cooling bed, performing temperature straightening, cutting, marking, detecting, inspecting, and warehousing.
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