CN113680818A - CSP flow-based SAE1006 thin material manufacturing method - Google Patents
CSP flow-based SAE1006 thin material manufacturing method Download PDFInfo
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- CN113680818A CN113680818A CN202110695286.XA CN202110695286A CN113680818A CN 113680818 A CN113680818 A CN 113680818A CN 202110695286 A CN202110695286 A CN 202110695286A CN 113680818 A CN113680818 A CN 113680818A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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- 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
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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Abstract
A CSP flow based SAE1006 sheet manufacturing method, said method comprising the steps of: preparing a low-carbon mild steel raw material; carrying out a steelmaking process on the low-carbon mild steel to obtain strip steel; carrying out a continuous casting process on the strip steel in a thin slab continuous casting machine; carrying out a soaking process on the strip steel in a tunnel soaking furnace; carrying out a dephosphorization procedure on the strip steel in a high-pressure dephosphorization machine; carrying out hot continuous rolling process on the strip steel in a continuous rolling unit; cooling the strip steel in a laminar cooling system; and a coiling step is carried out on the strip steel in a coiling machine. The method solves the problem of pit defects on the surface of the short-process SAE1006 thin material, achieves the purposes of high quality, low defective product and large-scale production of the surface of the short-process rolled SAE1006 thin material, can be used without modifying equipment, existing equipment and controlling in the implementation process, and is suitable for solving the listed pit defects on the surface of the SAE1006 thin material; simple and easy to do, easy to operate, the practicality is strong.
Description
Technical Field
The application relates to the field of thin-specification strip steel manufacturing, in particular to a CSP flow-based SAE1006 thin material manufacturing method.
Background
Compared with the conventional hot continuous rolling, the CSP (continuous casting and rolling) production line is more beneficial to thin material production due to the special process route and equipment, and meanwhile, the market potential of the thin material is huge under the promotion of 'cooling in hot zone'. With the intense competition of the market, the product structure of the Wu steel CSP production line is greatly adjusted, and the batch production of the extremely thin strip steel is greatly improved. The thickness range of the produced steel is 1.2-2.0mm, and the main production process comprises the following steps: desulfurizing → converter → argon blowing → LF → continuous casting → soaking furnace → finish rolling → layer cooling → coiling.
At present, when SAE1006 thin-specification strip steel is produced, the problem that pockmarks are easy to generate on the surface of the strip steel exists. In the normal rolling service cycle of the finish rolling working roll, the rear section of the stand is usually 1000 tons to 1500 tons, the front section of the stand is usually 3000 tons to 5000 tons, and when the working roll rolls to 200 tons to 300 tons when rolling SAE1006 thin strip steel, the surface of the strip steel has a pit defect of a serious degree. Specifically, when the finishing mill group rolls SAE1006 thin-specification strip steel (the thickness of a finished product is 1.2 mm-2.0 mm), because the pure rolling time is long when the short-process rolling is carried out on the ultrathin specification, the roll surfaces of F1-F4 are kept at an overhigh temperature for a long time, an oxide film becomes thick and begins to peel off, and the surface of a working roll becomes rough; on the other hand, when the working roll is in contact with a rolled piece, once the oxide film on the surface of the working roll is peeled off, the peeled oxide film is adhered to the surface of the hot-rolled strip steel, a new oxide skin is formed with Fe2O3 and Fe3O4 on the surface layer of the original strip steel, and in the subsequent rolling and biting process of a stand, a larger shearing stress is generated on the contact interface of a deformation zone to cause the FeO in the steel inner layer of the rolling zone to be crushed, and the oxide film, Fe2O3 and Fe3O4 on the surface layer adhered to the surface layer of the working roll surface are brought into the surface of a matrix and then a plurality of layers of fine oxide scales are pressed in, so that the pit defect is formed.
The defect can cause the quality of the strip steel to be judged, and the working rolls need to be replaced in advance, thereby seriously influencing the production rhythm, the product quality and the contract delivery of the main production thin-specification strip steel rolling unit.
Disclosure of Invention
The application provides a CSP flow-based SAE1006 thin material manufacturing method, which aims to solve the technical problems that the strip steel quality is judged due to pit defects, a working roll needs to be replaced in advance, and the production rhythm, the product quality and the contract delivery of a main production thin-specification strip steel rolling unit are seriously influenced.
The application provides a CSP flow-based SAE1006 thin material manufacturing method, which comprises the following steps:
preparing a low-carbon mild steel raw material;
carrying out a steelmaking process on the low-carbon mild steel to obtain strip steel;
carrying out a continuous casting process on the strip steel in a thin slab continuous casting machine;
carrying out a soaking process on the strip steel in a tunnel soaking furnace;
carrying out a dephosphorization procedure on the strip steel in a high-pressure dephosphorization machine;
carrying out hot continuous rolling process on the strip steel in a continuous rolling unit;
cooling the strip steel in a laminar cooling system;
and a coiling step is carried out on the strip steel in a coiling machine.
Preferably, the low-carbon mild steel comprises the following components in percentage by mass: 0.01 to 0.06 percent of C, less than or equal to 0.03 percent of Si, 0.1 to 0.5 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.008 percent of N, 0.02 to 0.06 percent of Als, 0.0008 to 0.0025 percent of B, and the balance of Fe and inevitable impurities.
Preferably, the soaking process of the strip steel in the tunnel soaking furnace comprises the following steps:
controlling the temperature of the heating section of the plate blank in the tunnel type soaking furnace to be 1175-1185 ℃;
and controlling the temperature of the slab discharging furnace in the tunnel type soaking furnace to be 1150-1160 ℃.
Preferably, the step of performing hot continuous rolling on the strip steel in the continuous rolling mill set comprises the steps of:
preparing a seven-frame continuous rolling unit;
controlling inlet temperatures of first to fourth stands in the seven-stand continuous rolling mill group to a preset value;
controlling the loads of first to seventh stands in the seven-stand continuous rolling mill group to preset values;
controlling the roller surface lubrication oil injection quantity of working rollers of second to sixth racks in the seven-rack continuous rolling unit to a preset value;
controlling the anti-stripping water spraying time sequence of the first to fourth stands in the seven-stand continuous rolling unit to a preset value;
and inputting the strip steel into the seven-stand continuous rolling unit and performing a hot continuous rolling process with the working rolls.
Preferably, the controlling the inlet temperature of the first to fourth stands in the seven-stand continuous rolling mill train to a preset value includes the steps of:
controlling the inlet temperature of the first frame to be 1020-1050 ℃;
controlling the inlet temperature of the second frame to 970-1000 ℃;
controlling the inlet temperature of the third frame to be 955-980 ℃;
the inlet temperature of the fourth stand was controlled to 925 ℃ to 960 ℃.
Preferably, the controlling the inlet temperature of the first to fourth stands in the seven-stand continuous rolling mill train to a preset value includes the steps of:
controlling the inlet temperature of the first frame to be 1040-1045 ℃;
controlling the inlet temperature of the second frame to be 990-995 ℃;
controlling the inlet temperature of the third frame to 970-975 ℃;
the inlet temperature of the fourth frame is controlled to be 935-940 ℃.
Preferably, the controlling the loads of the first to seventh stands in the seven-stand continuous rolling mill train to a preset value includes the steps of:
controlling the load of the first frame to be 45% -55%;
controlling the load of the second rack to be 45% -60%;
controlling the load of the third rack to be 45% -52%;
controlling the load of the fourth rack to be 40% -47%;
controlling the load of the fifth rack to be 25% -35%;
controlling the load of the sixth rack to be 20% -30%;
and controlling the load of the seventh rack to be 10-20%.
Preferably, the step of controlling the roller surface lubrication oil injection quantity of the working rollers of the second to sixth stands in the seven-stand continuous rolling mill group to a preset value comprises the following steps:
controlling the lubricating oil injection quantity of the roller surface of the working roller of the second frame to be 60 ml/min-80 ml/min;
controlling the lubricating oil injection quantity of the roller surface of the working roller of the third frame to be 60-80 ml/min;
controlling the roller surface lubrication oil injection quantity of the working roller of the fourth frame to be 50-70 ml/min;
controlling the lubricating oil injection quantity of the roll surface of the working roll of the fifth frame to be 40-60 ml/min;
the roller surface lubrication oil injection quantity of the working roller of the sixth frame is controlled to be 40-60 ml/min.
Preferably, the step of controlling the roller surface lubrication oil injection quantity of the working rollers of the second to sixth stands in the seven-stand continuous rolling mill group to a preset value comprises the following steps:
controlling the lubricating oil injection quantity of the roll surface of the working roll of the second frame to be 65 ml/min;
controlling the roller surface lubrication oil injection quantity of the working roller of the third frame to be 60 ml/min;
controlling the roller surface lubrication oil injection quantity of the working roller of the fourth frame to be 50 ml/min;
controlling the roller surface lubrication oil injection quantity of the working roller of the fifth frame to be 50 ml/min;
and controlling the roller surface lubrication oil injection quantity of the working roller of the sixth frame to be 40 ml/min.
Preferably, the step of controlling the anti-strip water spray timing of the first to fourth stands in the seven-stand continuous rolling mill train to a preset value comprises the steps of:
controlling the water spraying time sequence of the anti-stripping water of the first frame to be 11.8 m;
controlling the anti-stripping water spraying time sequence of the second rack to be 17.3 m;
controlling the stripping-proof water spraying time sequence of the third frame to be 22.8 m;
the fourth stand was controlled to have an anti-spalling water spray schedule of 28.3 m.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the SAE1006 thin material manufacturing method based on the CSP process, the inlet temperature of each rack F1-F4 is controlled, the rolling load of a front-section rack is controlled, the roll surface lubrication of a rolling working roll is controlled, and the anti-stripping water is controlled in the slab rolling process, so that the problem of the surface pit defect of the SAE1006 thin material in the short process is solved, the purposes of high quality, low defective product and large-scale production of the surface of the SAE1006 thin material in the short process are achieved, the SAE1006 thin material manufacturing method can be used without modification of equipment, existing equipment and control in the implementation process, and is suitable for solving the listed problem of the surface pit defect of the SAE1006 thin material; simple and easy to do, easy to operate, the practicality is strong.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic flow chart of a method for manufacturing SAE1006 thin material based on CSP flow according to an embodiment of the present application;
FIG. 2 is a schematic surface view of SAE1006 rolled product obtained by the prior art;
fig. 3 is a schematic surface diagram of an SAE1006 rolled product obtained by an SAE1006 thin material manufacturing method based on a CSP process according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic flow diagram of an SAE1006 thin material manufacturing method based on a CSP flow provided by an embodiment of the present application, wherein: (i) denotes a thin slab caster, (ii) denotes a pendulum shear, (iii) denotes a tunnel type soaking pit, (iv) denotes an accident shear, (iv) denotes a high-pressure phosphorus removal machine, (iv) denotes a vertical roll, (iv) denotes a 7-stand continuous rolling unit, (iii) denotes a laminar cooling system, and (iv) denotes a coiler.
In an embodiment of the present application, the present application provides a method for manufacturing SAE1006 thin material based on CSP flow, the method comprising the steps of:
s1: preparing a low-carbon mild steel raw material;
in the embodiment of the application, the low-carbon mild steel in the step S1 comprises the following components in percentage by mass: 0.01 to 0.06 percent of C, less than or equal to 0.03 percent of Si, 0.1 to 0.5 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.008 percent of N, 0.02 to 0.06 percent of Als, 0.0008 to 0.0025 percent of B, and the balance of Fe and inevitable impurities.
S2: carrying out a steelmaking process on the low-carbon mild steel to obtain strip steel;
in the embodiment of the present application, the low-carbon mild steel in step S1 is subjected to a steel-making process to obtain a strip steel.
S3: carrying out a continuous casting process on the strip steel in a thin slab continuous casting machine;
in the present embodiment, the strip steel in step S2 is placed in a thin slab caster to be subjected to a continuous casting process.
S4: carrying out a soaking process on the strip steel in a tunnel soaking furnace;
in the embodiment of the application, the soaking process of the strip steel in the tunnel type soaking furnace comprises the following steps:
controlling the temperature of the heating section of the plate blank in the tunnel type soaking furnace to be 1175-1185 ℃;
and controlling the temperature of the slab discharging furnace in the tunnel type soaking furnace to be 1150-1160 ℃.
In the embodiment of the present application, the step S4 of soaking the strip steel in the tunnel soaking furnace is to uniformly preheat the strip steel for the convenience of the subsequent processes.
In the embodiment of the application, the temperature of the heating section of the slab in the tunnel soaking furnace is controlled to be 1180 ℃, and the temperature of the slab out of the tunnel soaking furnace is controlled to be 1155 ℃.
S5: carrying out a dephosphorization procedure on the strip steel in a high-pressure dephosphorization machine;
in the embodiment of the present application, the strip steel in step S4 is subjected to a dephosphorization process.
S6: carrying out hot continuous rolling process on the strip steel in a continuous rolling unit;
in an embodiment of the present application, the step S6 of performing the hot continuous rolling process on the strip steel in the continuous rolling mill group includes the steps of:
preparing a seven-frame continuous rolling unit;
controlling inlet temperatures of first to fourth stands in the seven-stand continuous rolling mill group to a preset value;
controlling the loads of first to seventh stands in the seven-stand continuous rolling mill group to preset values;
controlling the roller surface lubrication oil injection quantity of working rollers of second to sixth racks in the seven-rack continuous rolling unit to a preset value;
controlling the anti-stripping water spraying time sequence of the first to fourth stands in the seven-stand continuous rolling unit to a preset value;
and inputting the strip steel into the seven-stand continuous rolling unit and performing a hot continuous rolling process with the working rolls.
In the embodiment of the application, when the hot continuous rolling process is carried out on the strip steel in the continuous rolling unit, firstly, a seven-stand continuous rolling unit is prepared, and the numbers of the seven-stand continuous rolling unit are F1-F7 in sequence; then controlling the inlet temperature of the first to fourth stands in the seven-stand continuous rolling unit to a preset value, controlling the loads of the first to seventh stands in the seven-stand continuous rolling unit to a preset value, controlling the roller surface lubrication oil injection quantity of the working rollers of the second to sixth stands in the seven-stand continuous rolling unit to a preset value, and controlling the anti-stripping water injection timing sequence of the first to fourth stands in the seven-stand continuous rolling unit to a preset value; and inputting the strip steel into the seven-stand continuous rolling unit and performing a hot continuous rolling process with the working rolls.
In an embodiment of the present application, the controlling the inlet temperature of the first to fourth stands in the seven-stand continuous rolling mill train to a preset value includes:
controlling the inlet temperature of the first frame to be 1020-1050 ℃;
controlling the inlet temperature of the second frame to 970-1000 ℃;
controlling the inlet temperature of the third frame to be 955-980 ℃;
the inlet temperature of the fourth stand was controlled to 925 ℃ to 960 ℃.
In the embodiment of the application, the inlet temperature of each frame F1-F4 in the rolling process is controlled mainly because Si element can be enriched and oxidized between oxide scale and a steel matrix to form a layer Fe2SiO4(2 FeO. SiO2), the structure is compact, the adhesion with the steel matrix is good, and the formation of the fayalite layer can prevent Fe ions of the matrix from diffusing to the outside, so that the oxidation process of the steel is slowed down. According to the SAE1006 steel, the Si content in the steel is less than or equal to 0.03%, the stripping property of the iron scale at high temperature is strong, the stripped iron scale is pressed into the surface of the strip steel to generate pit defects in the rolling process of the strip steel, and the surface temperature of the strip steel needs to be controlled in the rolling process in order to inhibit the stripping of the iron scale.
Further, in this embodiment of the present application, the controlling the inlet temperature of the first to fourth stands in the seven-stand continuous rolling mill train to a preset value includes the steps of:
controlling the inlet temperature of the first frame to be 1040-1045 ℃;
controlling the inlet temperature of the second frame to be 990-995 ℃;
controlling the inlet temperature of the third frame to 970-975 ℃;
the inlet temperature of the fourth frame is controlled to be 935-940 ℃.
In an embodiment of the present application, the controlling the loads of the first to seventh stands in the seven-stand continuous rolling mill train to a preset value includes:
controlling the load of the first frame to be 45% -55%;
controlling the load of the second rack to be 45% -60%;
controlling the load of the third rack to be 45% -52%;
controlling the load of the fourth rack to be 40% -47%;
controlling the load of the fifth rack to be 25% -35%;
controlling the load of the sixth rack to be 20% -30%;
and controlling the load of the seventh rack to be 10-20%.
In the embodiment of the application, the rolling load of the seven-stand continuous rolling mill set is controlled mainly because particle abrasion is generated between the strip steel and the roller in the process that forward slip and backward slip are generated in a deformation area when the strip steel is deformed in the strip steel rolling process, the deformation degree of the strip steel is increased along with the increase of the load of the stand, the reaction of the strip steel on the roller is also increased in the deformation process, an oxidized oxide film on the surface of the roller is quickly peeled off, and pockmark defects are generated when the oxide film is pressed into the surface of the strip steel.
In the embodiment of the application, when the thickness of the strip steel is more than 1.2mm and less than or equal to 1.5mm, the load of the frame Fl-F7 is controlled according to 53%, 58%, 47%, 42%, 32%, 22% and 13% respectively; when the thickness of the strip steel is 1.2mm, the loads of the frames F1-F7 are respectively controlled according to 55%, 56%, 43%, 40%, 30%, 20% and 11%.
In this embodiment of the present application, the step of controlling the roller surface lubrication oil injection amount of the working rollers of the second to sixth stands in the seven-stand continuous rolling mill group to a preset value includes:
controlling the lubricating oil injection quantity of the roller surface of the working roller of the second frame to be 60 ml/min-80 ml/min;
controlling the lubricating oil injection quantity of the roller surface of the working roller of the third frame to be 60-80 ml/min;
controlling the roller surface lubrication oil injection quantity of the working roller of the fourth frame to be 50-70 ml/min;
controlling the lubricating oil injection quantity of the roll surface of the working roll of the fifth frame to be 40-60 ml/min;
the roller surface lubrication oil injection quantity of the working roller of the sixth frame is controlled to be 40-60 ml/min.
In the embodiment of the application, the roll surface lubrication of the rolling working roll is controlled mainly because the friction coefficient between the roll and the strip steel is reduced by 30-50% and the rolling force is reduced by 10-40% in the rolling process when the oil-water mixture is sprayed on the surface of the strip steel and the roll, compared with the situation that the rolling lubrication is not used, the roughness of the roll and the surface of the strip steel can be reduced, the particle abrasion between the strip steel and the roll is further slowed down, and the oxide film on the surface of the roll is prevented from falling off rapidly.
Further, in this embodiment of the present application, the step of controlling the roller surface lubrication oil injection amount of the working rollers of the second to sixth stands in the seven-stand continuous rolling mill group to a preset value includes:
controlling the lubricating oil injection quantity of the roll surface of the working roll of the second frame to be 65 ml/min;
controlling the roller surface lubrication oil injection quantity of the working roller of the third frame to be 60 ml/min;
controlling the roller surface lubrication oil injection quantity of the working roller of the fourth frame to be 50 ml/min;
controlling the roller surface lubrication oil injection quantity of the working roller of the fifth frame to be 50 ml/min;
and controlling the roller surface lubrication oil injection quantity of the working roller of the sixth frame to be 40 ml/min.
In this embodiment, the step of controlling the spall prevention water spray timing of the first to fourth stands in the seven-stand continuous rolling mill train to a preset value includes:
controlling the water spraying time sequence of the anti-stripping water of the first frame to be 11.8 m;
controlling the anti-stripping water spraying time sequence of the second rack to be 17.3 m;
controlling the stripping-proof water spraying time sequence of the third frame to be 22.8 m;
the fourth stand was controlled to have an anti-spalling water spray schedule of 28.3 m.
In the embodiment of the application, the rolling anti-peeling water timing of the stands F1-F4 is controlled mainly because the surface temperature of the strip steel is high when the front-end stand of the seven-stand continuous rolling unit rolls, the temperatures of the stands F1-F4 are 1020-1050 ℃, 970-1000 ℃, 955-980 ℃ and 925-960 ℃, in order to prevent the oxide film on the surface of the roll from peeling off in the high-temperature environment, the anti-peeling water is sprayed to the roll gap during the rolling process of the strip steel, and the instant high temperature phenomenon on the surface of the roll is reduced. The anti-stripping water is started too early, so that the temperature of the head of the strip steel is low, and production accidents are caused; the peeling prevention falling into water is started too late, so that the surface temperature of the roller is sharply increased when the head of the strip steel is bitten by each frame, and the effect of protecting the oxide film on the surface of the roller from falling is not achieved, so that an optimal peeling prevention water control time sequence needs to be found according to the response time of the peeling prevention falling into water.
In the embodiment of the application, in the stage of controlling the anti-stripping water in the rolling of the seven-stand continuous rolling mill set, the inlets of the stands F1-F4 of the seven-stand continuous rolling mill set are provided with the upper anti-stripping water falling part and the lower anti-stripping water falling part, and in the process of rolling strip steel, the anti-stripping water is sprayed in gaps between a rolled piece and the upper working roll and the lower working roll, so that the surface temperature of the working rolls is reduced, and the oxide layer on the surfaces of the rolls is effectively prevented from dropping.
S7: cooling the strip steel in a laminar cooling system;
s8: and a coiling step is carried out on the strip steel in a coiling machine.
In the embodiment of the present application, the strip steel obtained in step S6 is subjected to a cooling process and a coiling process in this order, so that an SAE1006 thin material can be obtained.
The invention is further illustrated by the following specific examples:
the first embodiment is as follows: 1.2mm rolled, SAE1006 rolled, 1960 rolled blocks:
1. the average temperature of the head of the strip steel at the inlet of a rack F1-F4 of a seven-rack continuous rolling unit is 1040.04 ℃, 983.99 ℃, 965.58 ℃ and 937.87 ℃ respectively:
2. in the rolling load control stage of the seven-stand continuous rolling mill train, the loads of the stands F1-F7 are respectively controlled according to 55%, 56%, 43%, 40%, 30%, 20% and 11%;
3. the lubricating oil injection quantity of the roll surfaces of the working rolls of the frames F2-F6 is respectively controlled according to 65ml/min, 60ml/min, 50ml/min, 40ml/min and 40 ml/min;
4. when the head of the strip steel enters the roll gap of the working roll, the anti-stripping water is opened, and the water spraying time sequence is 11.8m, 17.3m, 22.8m and 28.3 m.
The effect is as follows: the roll of the frame F1-F7 has no pit defect from the use on the machine to the normal use of the strip steel surface of the machine.
Example two: h is more than 1.2 and less than or equal to 1.5mm, the rolling grade is SAE1006, the rolling block number is 3180:
1. the average temperatures of the strip steel head at the inlets of the seven-stand continuous rolling mill group stands F1-F4 are 1044.01 ℃, 991.05 ℃, 970.52 ℃ and 938.03 ℃ respectively;
2. in the rolling load control stage of the seven-stand continuous rolling mill train, the loads of the stands F1-F7 are respectively controlled according to 55%, 58%, 45%, 41%, 32%, 22% and 12%;
3. the lubricating oil injection quantity of the roll surfaces of the working rolls of the frames F2-F6 is respectively controlled according to 65ml/min, 60ml/min, 50ml/min, 40ml/min and 40 ml/min;
4. when the head of the strip steel enters the roll gap of the working roll, the anti-stripping water is opened, and the water spraying time sequence is 11.8m, 17.3m, 22.8m and 28.3 m.
The effect is as follows: the roll of the frame F1-F7 has no pit defect from the use on the machine to the normal use of the strip steel surface of the machine.
Example three: h is more than 1.5mm and less than or equal to 1.8mm, the rolling mark is SAE1006, the rolling block number is 1006:
1. the average temperatures of the strip steel head at the inlets of the seven-stand continuous rolling mill group stands F1-F4 are 1049.91 ℃, 998.88 ℃, 976.32 ℃ and 939.57 ℃ respectively;
2. in the rolling load control stage of the seven-stand continuous rolling mill train, the loads of the stands F1-F7 are respectively controlled according to 56%, 58%, 46%, 42%, 34%, 23% and 12%;
3. the lubricating oil injection quantity of the roll surfaces of the working rolls of the frames F2-F6 is respectively controlled according to 65ml/min, 60ml/min, 50ml/min, 40ml/min and 40 ml/min;
4. when the head of the strip steel enters the roll gap of the working roll, the anti-stripping water is opened, and the water spraying time sequence is 11.8m, 17.3m, 22.8m and 28.3 m.
The effect is as follows: the roll of the frame F1-F7 has no pit defect from the use on the machine to the normal use of the strip steel surface of the machine.
Example four: h is more than 1.8 and less than or equal to 2.0mm, the rolling grade is SAE1006, and the rolling block number is 1097:
1. the average temperatures of the strip steel head at the inlets of the seven-stand continuous rolling mill group stands F1-F4 are 1048.15 ℃, 999.80 ℃, 979.31 ℃ and 943.25 ℃ respectively;
2. in the rolling load control stage of the seven-stand continuous rolling mill train, the loads of the stands F1-F7 are respectively controlled according to 56%, 58%, 47%, 43%, 35%, 24% and 12%;
3. the lubricating oil injection quantity of the roll surfaces of the working rolls of the frames F2-F6 is respectively controlled according to 65ml/min, 60ml/min, 50ml/min, 40ml/min and 40 ml/min;
4. when the head of the strip steel enters the roll gap of the working roll, the anti-stripping water is opened, and the water spraying time sequence is 11.8m, 17.3m, 22.8m and 28.3 m.
The effect is as follows: the roll of the frame F1-F7 has no pit defect from the use on the machine to the normal use of the strip steel surface of the machine.
FIG. 2 shows the SAE1006 thin material surface obtained by the prior art, while FIG. 3 shows the SAE1006 thin material surface obtained by the present application, and it can be seen by comparison that the SAE1006 thin material without pit defect can be obtained by the present application.
According to the SAE1006 thin material manufacturing method based on the CSP process, the inlet temperature of each rack F1-F4 is controlled, the rolling load of a front-section rack is controlled, the roll surface lubrication of a rolling working roll is controlled, and the anti-stripping water is controlled in the slab rolling process, so that the problem of the surface pit defect of the SAE1006 thin material in the short process is solved, the purposes of high quality, low defective product and large-scale production of the surface of the SAE1006 thin material in the short process are achieved, the SAE1006 thin material manufacturing method can be used without modification of equipment, existing equipment and control in the implementation process, and is suitable for solving the listed problem of the surface pit defect of the SAE1006 thin material; simple and easy to do, easy to operate, the practicality is strong.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A CSP flow-based SAE1006 thin material manufacturing method is characterized by comprising the following steps:
preparing a low-carbon mild steel raw material;
carrying out a steelmaking process on the low-carbon mild steel to obtain strip steel;
carrying out a continuous casting process on the strip steel in a thin slab continuous casting machine;
carrying out a soaking process on the strip steel in a tunnel soaking furnace;
carrying out a dephosphorization procedure on the strip steel in a high-pressure dephosphorization machine;
carrying out hot continuous rolling process on the strip steel in a continuous rolling unit;
cooling the strip steel in a laminar cooling system;
and a coiling step is carried out on the strip steel in a coiling machine.
2. The CSP flow-based SAE1006 thin material manufacturing method according to claim 1, wherein the low carbon mild steel comprises the following components by mass fraction: 0.01 to 0.06 percent of C, less than or equal to 0.03 percent of Si, 0.1 to 0.5 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.008 percent of N, 0.02 to 0.06 percent of Als, 0.0008 to 0.0025 percent of B, and the balance of Fe and inevitable impurities.
3. The CSP flow based SAE1006 sheet manufacturing method according to claim 1, wherein said soaking the strip steel in a tunnel soaking furnace comprises the steps of:
controlling the temperature of the heating section of the plate blank in the tunnel type soaking furnace to be 1175-1185 ℃;
and controlling the temperature of the slab discharging furnace in the tunnel type soaking furnace to be 1150-1160 ℃.
4. The CSP flow based SAE1006 sheet manufacturing method according to claim 1, wherein said hot continuous rolling process of said strip steel in a continuous rolling mill train comprises the steps of:
preparing a seven-frame continuous rolling unit;
controlling inlet temperatures of first to fourth stands in the seven-stand continuous rolling mill group to a preset value;
controlling the loads of first to seventh stands in the seven-stand continuous rolling mill group to preset values;
controlling the roller surface lubrication oil injection quantity of working rollers of second to sixth racks in the seven-rack continuous rolling unit to a preset value;
controlling the anti-stripping water spraying time sequence of the first to fourth stands in the seven-stand continuous rolling unit to a preset value;
and inputting the strip steel into the seven-stand continuous rolling unit and performing a hot continuous rolling process with the working rolls.
5. The CSP flow-based SAE1006 thin material manufacturing method according to claim 4, wherein the controlling the inlet temperature of the first to fourth stands in the seven stand continuous rolling mill group to a preset value comprises the steps of:
controlling the inlet temperature of the first frame to be 1020-1050 ℃;
controlling the inlet temperature of the second frame to 970-1000 ℃;
controlling the inlet temperature of the third frame to be 955-980 ℃;
the inlet temperature of the fourth stand was controlled to 925 ℃ to 960 ℃.
6. The CSP flow-based SAE1006 thin material manufacturing method according to claim 4 or 5, wherein the controlling the inlet temperature of the first to fourth stands in the seven stand continuous rolling mill group to a preset value comprises the steps of:
controlling the inlet temperature of the first frame to be 1040-1045 ℃;
controlling the inlet temperature of the second frame to be 990-995 ℃;
controlling the inlet temperature of the third frame to 970-975 ℃;
the inlet temperature of the fourth frame is controlled to be 935-940 ℃.
7. The CSP flow-based SAE1006 thin material manufacturing method according to claim 4, wherein the controlling the loads of the first to seventh stands in the seven stand continuous rolling mill group to the preset values comprises the steps of:
controlling the load of the first frame to be 45% -55%;
controlling the load of the second rack to be 45% -60%;
controlling the load of the third rack to be 45% -52%;
controlling the load of the fourth rack to be 40% -47%;
controlling the load of the fifth rack to be 25% -35%;
controlling the load of the sixth rack to be 20% -30%;
and controlling the load of the seventh rack to be 10-20%.
8. The CSP flow-based SAE1006 thin material manufacturing method according to claim 4, wherein the step of controlling the roller surface lubrication oil injection quantity of the working rollers of the second to sixth stands in the seven-stand continuous rolling mill group to a preset value comprises the steps of:
controlling the lubricating oil injection quantity of the roller surface of the working roller of the second frame to be 60 ml/min-80 ml/min;
controlling the lubricating oil injection quantity of the roller surface of the working roller of the third frame to be 60 l/min-80 ml/min;
controlling the roller surface lubrication oil injection quantity of the working roller of the fourth frame to be 501/min-70 ml/min;
controlling the lubricating oil injection quantity of the roll surface of the working roll of the fifth frame to be 40-60 ml/min;
the roller surface lubrication oil injection quantity of the working roller of the sixth frame is controlled to be 40-60 ml/min.
9. The CSP flow-based SAE1006 thin material manufacturing method according to claim 4 or 8, wherein the step of controlling the roller surface lubrication oil injection quantity of the working rollers of the second to the sixth stands in the seven-stand continuous rolling mill group to a preset value comprises the steps of:
controlling the lubricating oil injection quantity of the roll surface of the working roll of the second frame to be 65 ml/min;
controlling the roller surface lubrication oil injection quantity of the working roller of the third frame to be 60 ml/min;
controlling the roller surface lubrication oil injection quantity of the working roller of the fourth frame to be 50 ml/min;
controlling the roller surface lubrication oil injection quantity of the working roller of the fifth frame to be 50 ml/min;
and controlling the roller surface lubrication oil injection quantity of the working roller of the sixth frame to be 40 ml/min.
10. The CSP flow-based SAE1006 sheet manufacturing method according to claim 4, wherein the controlling the strip-proof water spray timing of the first to fourth stands in the seven-stand continuous rolling mill group to a preset value comprises the steps of:
controlling the water spraying time sequence of the anti-stripping water of the first frame to be 11.8 m;
controlling the anti-stripping water spraying time sequence of the second rack to be 17.3 m;
controlling the stripping-proof water spraying time sequence of the third frame to be 22.8 m;
the fourth stand was controlled to have an anti-spalling water spray schedule of 28.3 m.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101108394A (en) * | 2007-08-22 | 2008-01-23 | 马鞍山钢铁股份有限公司 | Method of sheet billet continuously casting and rolling to produce thin strip steel coil |
| CN102839321A (en) * | 2012-08-31 | 2012-12-26 | 武汉钢铁(集团)公司 | Ultrathin hot-rolled sheet strip with yield strength more than or equal to 500MPa level and manufacturing method thereof |
| CN106269871A (en) * | 2016-08-30 | 2017-01-04 | 武汉钢铁股份有限公司 | A kind of method producing line employing increasing speed rolling technique production thickness≤2.0mm low-intensity strip steel at CSP |
| CN107130178A (en) * | 2017-04-27 | 2017-09-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of high-strength wheel steel of 500Mpa grades of automobile and its CSP technique productions methods |
| CN107245656A (en) * | 2017-06-16 | 2017-10-13 | 武汉钢铁有限公司 | The fin steel and its CSP production technologies of a kind of excellent surface quality |
| CN107641699A (en) * | 2017-09-20 | 2018-01-30 | 武汉钢铁有限公司 | Method based on CSP flows production Thin Specs hot rolling DP780 steel |
| CN108856305A (en) * | 2018-06-14 | 2018-11-23 | 武汉钢铁有限公司 | A kind of non-orientation silicon steel production mill load distribution method |
| CN108971225A (en) * | 2018-09-27 | 2018-12-11 | 武汉钢铁有限公司 | A kind of weather-proof checkered steel plate and its production method |
| CN108971224A (en) * | 2018-09-27 | 2018-12-11 | 武汉钢铁有限公司 | A kind of checkered steel plate and its production method |
| CN109266961A (en) * | 2018-09-26 | 2019-01-25 | 武汉钢铁有限公司 | Using the 600MPa grade thin gauge Hot Rolling Automobile structural steel and method of short route production |
| CN110216152A (en) * | 2019-05-30 | 2019-09-10 | 武汉钢铁有限公司 | A kind of control method improving the strip wedge shape rolled there are two-phase section |
| CN111389912A (en) * | 2020-03-16 | 2020-07-10 | 武汉钢铁有限公司 | Control method for surface pitting defects of medium-carbon low-alloy ultrathin strip steel in short-process rolling |
| CN111957752A (en) * | 2020-07-20 | 2020-11-20 | 武汉钢铁有限公司 | Production method for eliminating bright band and additional wave shape defects on surface of hot-rolled low-carbon mild steel |
-
2021
- 2021-06-22 CN CN202110695286.XA patent/CN113680818B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101108394A (en) * | 2007-08-22 | 2008-01-23 | 马鞍山钢铁股份有限公司 | Method of sheet billet continuously casting and rolling to produce thin strip steel coil |
| CN102839321A (en) * | 2012-08-31 | 2012-12-26 | 武汉钢铁(集团)公司 | Ultrathin hot-rolled sheet strip with yield strength more than or equal to 500MPa level and manufacturing method thereof |
| CN106269871A (en) * | 2016-08-30 | 2017-01-04 | 武汉钢铁股份有限公司 | A kind of method producing line employing increasing speed rolling technique production thickness≤2.0mm low-intensity strip steel at CSP |
| CN107130178A (en) * | 2017-04-27 | 2017-09-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of high-strength wheel steel of 500Mpa grades of automobile and its CSP technique productions methods |
| CN107245656A (en) * | 2017-06-16 | 2017-10-13 | 武汉钢铁有限公司 | The fin steel and its CSP production technologies of a kind of excellent surface quality |
| CN107641699A (en) * | 2017-09-20 | 2018-01-30 | 武汉钢铁有限公司 | Method based on CSP flows production Thin Specs hot rolling DP780 steel |
| CN108856305A (en) * | 2018-06-14 | 2018-11-23 | 武汉钢铁有限公司 | A kind of non-orientation silicon steel production mill load distribution method |
| CN109266961A (en) * | 2018-09-26 | 2019-01-25 | 武汉钢铁有限公司 | Using the 600MPa grade thin gauge Hot Rolling Automobile structural steel and method of short route production |
| CN108971225A (en) * | 2018-09-27 | 2018-12-11 | 武汉钢铁有限公司 | A kind of weather-proof checkered steel plate and its production method |
| CN108971224A (en) * | 2018-09-27 | 2018-12-11 | 武汉钢铁有限公司 | A kind of checkered steel plate and its production method |
| CN110216152A (en) * | 2019-05-30 | 2019-09-10 | 武汉钢铁有限公司 | A kind of control method improving the strip wedge shape rolled there are two-phase section |
| CN111389912A (en) * | 2020-03-16 | 2020-07-10 | 武汉钢铁有限公司 | Control method for surface pitting defects of medium-carbon low-alloy ultrathin strip steel in short-process rolling |
| CN111957752A (en) * | 2020-07-20 | 2020-11-20 | 武汉钢铁有限公司 | Production method for eliminating bright band and additional wave shape defects on surface of hot-rolled low-carbon mild steel |
Non-Patent Citations (1)
| Title |
|---|
| 曹锋利: "热轧板带亮带分析与探讨", 《金属材料与冶金工程》 * |
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