CN113664036A - High-strong-acid washed sheet rolling method - Google Patents
High-strong-acid washed sheet rolling method Download PDFInfo
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- CN113664036A CN113664036A CN202010403668.6A CN202010403668A CN113664036A CN 113664036 A CN113664036 A CN 113664036A CN 202010403668 A CN202010403668 A CN 202010403668A CN 113664036 A CN113664036 A CN 113664036A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000002253 acid Substances 0.000 title claims abstract description 18
- 230000009467 reduction Effects 0.000 claims abstract description 12
- 238000010079 rubber tapping Methods 0.000 claims abstract description 11
- 238000005461 lubrication Methods 0.000 claims abstract description 8
- 238000013461 design Methods 0.000 claims abstract description 6
- 239000010687 lubricating oil Substances 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 description 11
- 230000001965 increasing effect Effects 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 238000005554 pickling Methods 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 3
- 210000003298 dental enamel Anatomy 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 239000008207 working material Substances 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a high strong acid washed sheet rolling method, which comprises the following steps: step 1: the tapping temperature is controlled to be 1200-1250 ℃; step 2: the furnace time is more than or equal to 200 minutes; and step 3: the number of groups for rough rolling, descaling and application is 6-8; and 4, step 4: the thickness of the intermediate blank is reduced to 32mm from 35mm which is the minimum design; and 5: 2-3 groups of groups are used for finish rolling and descaling; step 6: the threading speed is 10-12 m/s; and 7: setting the F1 reduction rate to be 55-60%; and 8: f2 unit load is controlled within 2 t/mm; and step 9: f3 unit load is controlled within 1.8 t/mm; step 10: f1-7 lubrication rolling is completely put into the rolling mill, wherein the proportion of F2 and F3 lubricating oil is more than or equal to 5 per thousand; step 11: the fluctuation range of the elevation of the F1-7 rolling line is +/-2.5 mm; step 12: the centering precision range of the F1-7 side guide plate is +/-2 mm; step 13: f1-7 lower supporting roll horizontal fluctuation range +/-1 mm/m.
Description
Technical Field
The invention relates to a rolling method, in particular to a high-strong acid washed sheet rolling method, and belongs to the technical field of hot rolling and pickling.
Background
The hot-rolled pickled plate is a steel plate which is produced according to the production mode of the hot-rolled plate and meets the requirements of the quality and the application of a cold-rolled plate, and mainly comprises three types of steel for deep-drawing compressors, steel for automobile structures and enamel steel. Since pickled steel sheets are relatively thick, they are generally 1.4 to 8mm thick, exceeding the product outline range of cold rolling mills, and can only be produced by hot rolling. Because the quality of the cold-rolled sheet is far higher than that of the hot-rolled sheet in terms of surface and size precision, the production difficulty of the hot-rolled pickled sheet is very high, particularly the high-acid washed sheet has too high tapping temperature, and the defects of the temperature system iron skin cannot be controlled; the tapping temperature is too low, the rolling load is large, the defects of iron sheet of a roll system are easily caused, the defects of the roll marks of the next steel block caused by rolling breakage are caused, and the product quality requirements can not be met.
For similar situations, many works have been done in various production plants and research institutes. Chinese patent application CN201711393932.7 "a pickling sheet (roll) for stamping and manufacturing method", uses ESP process to produce deep-drawing type pickling sheet. Chinese patent CN201310489332.6 discloses a method for producing a hot-rolled pickling-free plate by combining thin-strip continuous casting with reduction annealing. Chinese patent application CN201110086611.9 "a steel plate and method for producing water heater liner enamel on thin slab continuous casting and rolling line", provides a hot-rolled pickled steel plate and process method for producing water heater liner enamel on FTSR thin slab continuous casting and rolling line. No solution to the aforementioned problem has been sought. Therefore, a new solution to solve the above technical problems is urgently needed.
Disclosure of Invention
The invention provides a high-strong acid washing sheet rolling method aiming at the problems in the prior art, hot rolled plate production mainly comprises four processes of heating, rough rolling, finish rolling, coiling and the like, the heating process heats a plate blank to ensure that steel is rolled by an austenite structure, the heating temperature is too high, more iron scales generated in the heating process are difficult to remove, overheating and overburning can be caused seriously, the plate blank is directly scrapped, and simultaneously, the fuel consumption is large and the cost is increased. The rough rolling process rolls the slab into an intermediate slab, and removes scales generated in the heating process and scales generated in the rough rolling process by descaling. In the finish rolling process, the intermediate billet needs to be rolled into a finished product, and the scale formed on the surface of the strip billet after the rough rolling is finished needs to be removed. The coiling procedure is mainly used for coiling the finish rolling finished strip steel. Normally, the thinner the finished product, the greater the rolling load and the longer the rolling time. The strip billet can radiate heat to the outside in the rolling process due to high temperature, and the longer the rolling time is, the larger the temperature drop of the strip billet in the process is. Therefore, the difficulty of rolling and finish rolling of thin specifications is high, the heating temperature is generally higher, and the thickness of the intermediate billet is smaller. The pickling products have high requirements on surface quality, and the rolling difficulty is increased, which is mainly shown in several aspects: firstly, the rolling load is large, and besides the requirement of equipment capacity, the F2 and F3 working rolls are easy to peel off an oxide film; secondly, the rolling stability is poor, the same thickness deviation causes large plate shape change; the centering precision requirements of the horizontal side guide plate and the side guide plate of the rolling mill are high, otherwise the rolling breaking drift easily occurs; thirdly, the requirement on the surface quality is high, and the oxide scale defect is not allowed to exist, so that all the oxide scales need to be removed in descaling, and the regenerated oxide scales need to be controllable after descaling; the scheme provides a rolling method of a high-acid washing plate with the thickness of less than 1.8mm, mainly aims at the problem of exposure in a finish rolling process, and solves the problem of work development in heating, rough rolling and finish rolling processes, and particularly improves the overall temperature of a strip billet in the heating process by properly improving the tapping temperature and controlling the time in a furnace; in the rough rolling procedure, the surface temperature is reduced by increasing descaling passes, and the finish rolling load is reduced by reducing the thickness of an intermediate billet; in the finish rolling step, the unit loads of F2 and F3 are controlled within a predetermined range by using lubrication rolling, increasing the F1 reduction ratio, and the like; and the rolling stability is ensured through equipment precision control.
In order to achieve the above object, the technical solution of the present invention is a high strong acid sheet washing and rolling method, comprising the steps of:
step 1: the tapping temperature is controlled to be 1200-1250 ℃;
step 2: the furnace time is more than or equal to 200 minutes;
and step 3: the number of groups for rough rolling, descaling and application is 6-8;
and 4, step 4: the thickness of the intermediate blank is reduced to 32mm from 35mm which is the minimum design;
and 5: 2-3 groups of groups are used for finish rolling and descaling;
step 6: the threading speed is 10-12 m/s;
and 7: setting the F1 reduction rate to be 55-60%;
and 8: f2 unit load is controlled within 2 t/mm;
and step 9: f3 unit load is controlled within 1.8 t/mm;
step 10: f1-7 lubrication rolling is completely put into the rolling mill, wherein the proportion of F2 and F3 lubricating oil is more than or equal to 5 per thousand;
step 11: the fluctuation range of the elevation of the F1-7 rolling line is +/-2.5 mm;
step 12: the centering precision range of the F1-7 side guide plate is +/-2 mm;
step 13: f1-7 lower supporting roll horizontal fluctuation range +/-1 mm/m.
As a modification of the present invention, the step 3: 6-8 groups of rough rolling descaling application groups are specifically as follows: wherein the descaling impact force of the first group (descaling box) is 0.61-0.81g/mm, the descaling impact force of the second group is 1.27-1.56g/mm, the serious problem of furnace pig skin caused by heating temperature rise is eliminated by improving the descaling impact force of the second group, and the descaling impact force of other groups is normal level.
As an improvement of the invention, the thickness of the intermediate blank is reduced to 32mm from 35mm which is the minimum design, and the method comprises the following specific steps: the thicknesses of the strip blanks after 1-3 times of R1 rolling are respectively as follows: 186-188mm, 145-147mm and 116-118mm (thickness in hot state), the strip thickness after the 1 st to 3 rd pass rolling of R2 is respectively: 80-82mm, 52-50mm, 32.44mm (thickness in hot state).
As a modification of the present invention, the step 7: the F1 reduction rate is set to be 55-60%, and the concrete steps are as follows: the thicknesses of the strip steels rolled by the F1-7 rolling mill are respectively as follows: 13-14.6mm, 6.8-7.8mm, 3.8-4.6mm, 2.6-3.2mm, 1.85-2.4mm, 1.58-2mm, 1.41-1.83mm (thickness in hot state).
Compared with the prior art, the method has the advantages that after the method is adopted, the integral temperature of the strip billet is improved due to the increase of the tapping temperature; at the moment, higher descaling impact force is needed to ensure the surface quality, the temperature is increased, the load is reduced, conditions are created for reducing the thickness of the intermediate billet, and the overall load of the finishing mill is indirectly reduced; by increasing the number of descaling groups, the descaling effect is improved and the surface oxidation after descaling is reduced; increasing the F1 reduction rate by lubrication rolling to create conditions for controlling F2 and F3 loads; and the equipment precision management standard is increased, and conditions are created for rolling stability. From the implementation, the 1780 production line can stably produce the products with the specifications of the structural automobile steel SAPH440 high-acid washed thin plates 1.4 x 960, 1.6 x 1220 and the like, the products with the specifications of the structural automobile steel QStE420TM high-acid washed thin plates 1.5 x 920, 1.6 x 1000 and the like, the products with the specifications of the structural automobile steel SPFH590 high-acid washed thin plates 1.6 x 1050, 1.8 x 1250 and the products with the specifications of the enameled steel BTC245 high-acid washed thin plates 1.8 x 1167 and the like, and the products are approved by customers.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the following detailed description is given in conjunction with examples.
Example 1: a high strong acid washed sheet rolling method, comprising the steps of:
step 1: the tapping temperature is controlled to be 1200-1250 ℃;
step 2: the furnace time is more than or equal to 200 minutes;
and step 3: the number of groups for rough rolling, descaling and application is 6-8;
and 4, step 4: the thickness of the intermediate blank is reduced to 32mm from 35mm which is the minimum design;
and 5: 2-3 groups of groups are used for finish rolling and descaling;
step 6: the threading speed is 10-12 m/s;
and 7: setting the F1 reduction rate to be 55-60%;
and 8: f2 unit load is controlled within 2 t/mm;
and step 9: f3 unit load is controlled within 1.8 t/mm;
step 10: f1-7 lubrication rolling is completely put into the rolling mill, wherein the proportion of F2 and F3 lubricating oil is more than or equal to 5 per thousand;
step 11: the fluctuation range of the elevation of the F1-7 rolling line is +/-2.5 mm;
step 12: the centering precision range of the F1-7 side guide plate is +/-2 mm;
step 13: f1-7 lower supporting roll horizontal fluctuation range +/-1 mm/m.
The step 3: 6-8 groups of rough rolling descaling application groups are specifically as follows: wherein the first group (descaling box) descaling impact force is 0.61-0.81g/mm, the second group descaling impact force is 1.27-1.56g/mm, and the serious problem of furnace pig skin caused by heating temperature rise is eliminated by improving the second group descaling impact force.
The thickness of the intermediate blank is reduced to 32mm from 35mm which is the minimum design, and the method comprises the following specific steps: the thicknesses of the strip blanks after 1-3 times of R1 rolling are respectively as follows: 186-188mm, 145-147mm and 116-118mm (thickness in hot state), the strip thickness after the 1 st to 3 rd pass rolling of R2 is respectively: 80-82mm, 52-50mm, 32.44mm (thickness in hot state).
The step 7: the F1 reduction rate is set to be 55-60%, and the concrete steps are as follows: the thicknesses of the strip steels rolled by the F1-7 rolling mill are respectively as follows: 13-14.6mm, 6.8-7.8mm, 3.8-4.6mm, 2.6-3.2mm, 1.85-2.4mm, 1.58-2mm, 1.41-1.83mm (thickness in hot state).
The 32 mm-thickness intermediate billet related by the invention is rolled by a 230 mm-thickness slab, wherein R1 and R2 rolling mills respectively roll for three times, wherein the roughing mill R1 is a two-roller reversing mill, the diameter range of a working roller is 1350-1200mm, the length of a roller body is 1780mm, and the roller is made of alloy cast steel or hot tool steel. The thicknesses of the strip blanks after 1-3 times of R1 rolling are respectively as follows: 186-188mm, 145-147mm, 116-118mm (thickness in hot state).
The roughing mill R2 is a four-roller reversible mill, the diameter range of a supporting roller is 1550-; the diameter range of the working roll is 1250-. The thicknesses of the strip blanks after 1-3 times of R2 rolling are respectively as follows: 80-82mm, 52-50mm, 32.44mm (thickness in hot state).
The invention relates to a high-strength acid washing sheet with the thickness of 1.4-1.8mm, which is formed by rolling an intermediate blank with the thickness of 32mm by 7 finishing mills, wherein the 7 finishing mills are four-roller mills, the diameter range of a supporting roller is 1550-1400mm, the length of a roller body is 1780mm, and the material is Cr5 forged steel; the length of all working roll bodies is 2080mm, the diameter range of the working roll of the F1 rolling mill is 835-790mm, the diameter range of the working roll of the F2 rolling mill is 810-770mm, the diameter range of the working roll of the F3 rolling mill is 790-750mm, the diameter range of the working roll of the F4 rolling mill is 770-730mm, and the materials of the working roll of the F1-4 rolling mill are high-speed steel; the diameter range of the working roll of the F5 rolling mill is 675-630mm, the diameter range of the working roll of the F6 rolling mill is 705-660mm, the diameter range of the working roll of the F7 rolling mill is 735-690mm, and the working materials of the F5-7 rolling mill are all high-nickel-chromium infinite chilled cast iron. The thicknesses of the strip steels rolled by the F1-7 rolling mill are respectively as follows: 13-14.6mm, 6.8-7.8mm, 3.8-4.6mm, 2.6-3.2mm, 1.85-2.4mm, 1.58-2mm, 1.41-1.83mm (thickness in hot state).
As the tapping temperature is higher, in order to ensure the descaling effect, the number of the descaling nozzles of the first group (descaling box) of rough rolling is 25, the group flow rate is 125-160t/h, the spray width is 1782mm, the striking force is 0.61-0.81g/mm, the number of the nozzles of the second group is 24, the group flow rate is 248-307t/h, the spray width is 1711mm, and the striking force is 1.27-1.56 g/mm.
Application example 1:
SAPH440 steel grade 1.4 x 960 specification rolling method.
Step 1: the tapping temperature is 1240 ℃, and the actual tapping temperature is 1243 DEG C
Step 2: the on-furnace time target was 200 minutes and the actual on-furnace time was 234 minutes.
And step 3: 6 groups are set for rough rolling scale removal, and 6 groups are used for actual scale removal. Wherein the first group (descaling box) has descaling impact force of 0.61-0.81g/mm, and the second group has descaling impact force of 1.27-1.56 g/mm.
And 4, step 4: the target thickness of the intermediate blank is 32mm, and the actual thickness of the intermediate blank is 32 mm. The thicknesses of the strip after 1-3 passes of the R1 rolling mill are 187mm, 146.1mm and 117.23mm respectively. The thicknesses of the strip blanks after 1-3 passes of the R2 rolling mill are respectively as follows: 81.75mm, 51.08mm, 32.44 mm.
And 5: 2 groups of fine rolling and descaling operation are set,
step 6: the threading speed was 11 m/s.
And 7: the F1 reduction was set to 57.5%. The thicknesses of the outlet strip blanks after the F1-7 rolling are respectively 13.8mm, 6.81mm,
3.87mm、2.60mm、1.87mm、1.59mm、1.41mm
And 8: f2 specific load was controlled at 1980 t/m.
And step 9: the unit load of F3 was controlled at 1782 t/m.
Step 10: and F1-7 is used for lubrication rolling, wherein the proportions of F2 and F3 are 6 per thousand and 5 per thousand respectively.
And 11, +/-2 mm of the height range of the F1-7 rolling line.
Step 12: f1-7 side guide plate centering precision range is +/-2 mm.
Step 13: f1-7 lower supporting roll horizontal fluctuation range +/-1 mm/m.
According to the process, 5 blocks can be continuously rolled on site, the site production is stable, and the product quality meets the requirements of users.
Application example 2: SPFH590 steel grade 1.8 × 1160 specification rolling method.
Step 1: the discharge temperature is 1240 ℃, and the actual discharge temperature is 1238 DEG C
Step 2: the on-furnace time target was 200 minutes, and the actual on-furnace time was 229 minutes.
And step 3: 6 groups are set for rough rolling scale removal, and 6 groups are used for actual scale removal. Wherein the first group (descaling box) has descaling impact force of 0.61-0.81g/mm, and the second group has descaling impact force of 1.27-1.56 g/mm.
And 4, step 4: the target thickness of the intermediate blank is 32mm, and the actual thickness of the intermediate blank is 32 mm. The thicknesses of the strip blanks after 1-3 passes of the R1 rolling mill are 186.8mm, 146mm and 117.12mm respectively. The thicknesses of the strip blanks after 1-3 passes of the R2 rolling mill are respectively as follows: 81.85mm, 51.17mm, 32.44 mm.
And 5: the set of finish rolling descaling operation is 2 groups.
Step 6: the threading speed was 11 m/s.
And 7: the F1 reduction was set to 55%. The thicknesses of outlet strip blanks after F1-7 rolling are respectively as follows: 14.86mm, 7.78mm,
4.63mm、3.19mm、2.38mm、1.99mm、1.83mm
And 8: f2 unit load is controlled at 2000 t/m.
And step 9: the unit load of F3 is controlled at 1798 t/m.
Step 10: and F1-7 is used for lubrication rolling, wherein the proportions of F2 and F3 are 6 per thousand and 5 per thousand respectively.
Step 11: the height range of the F1-7 rolling line is +/-2 mm.
Step 12: f1-7 side guide plate centering precision range is +/-2 mm.
Step 13: f1-7 lower supporting roll horizontal fluctuation range +/-1 mm/m.
According to the process, 4 blocks can be continuously rolled on site, the site production is stable, and the product quality meets the requirements of users.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (4)
1. A high-strong-acid sheet-washing rolling method is characterized by comprising the following steps of:
step 1: the tapping temperature is controlled to be 1200-1250 ℃;
step 2: the furnace time is more than or equal to 200 minutes;
and step 3: the number of groups for rough rolling, descaling and application is 6-8;
and 4, step 4: the thickness of the intermediate blank is reduced to 32mm from 35mm which is the minimum design;
and 5: 2-3 groups of groups are used for finish rolling and descaling;
step 6: the threading speed is 10-12 m/s;
and 7: setting the F1 reduction rate to be 55-60%;
and 8: f2 unit load is controlled within 2 t/mm;
and step 9: f3 unit load is controlled within 1.8 t/mm;
step 10: f1-7 lubrication rolling is completely put into the rolling mill, wherein the proportion of F2 and F3 lubricating oil is more than or equal to 5 per thousand;
step 11: the fluctuation range of the elevation of the F1-7 rolling line is +/-2.5 mm;
step 12: the centering precision range of the F1-7 side guide plate is +/-2 mm;
step 13: f1-7 lower supporting roll horizontal fluctuation range +/-1 mm/m.
2. The high acid washed sheet rolling process of claim 1, wherein said step 3: 6-8 groups of rough rolling descaling application groups are specifically as follows: wherein the first group (descaling box) descaling impact force is 0.61-0.81g/mm, the second group descaling impact force is 1.27-1.56g/mm, and the serious problem of furnace pig skin caused by heating temperature rise is eliminated by improving the second group descaling impact force.
3. A high acid washed sheet rolling process according to claim 2, wherein the thickness of the intermediate billet is reduced from a designed minimum of 35mm to 32mm, as follows: the thicknesses of the strip blanks after 1-3 times of R1 rolling are respectively as follows: 186-188mm, 145-147mm and 116-118mm (thickness in hot state), the strip thickness after the 1 st to 3 rd pass rolling of R2 is respectively: 80-82mm, 52-50mm, 32.44mm (thickness in hot state).
4. The high acid washed sheet rolling process of claim 3, wherein said step 7: the F1 reduction rate is set to be 55-60%, and the concrete steps are as follows: the thicknesses of the strip steels rolled by the F1-7 rolling mill are respectively as follows: 13-14.6mm, 6.8-7.8mm, 3.8-4.6mm, 2.6-3.2mm, 1.85-2.4mm, 1.58-2mm, 1.41-1.83mm (thickness in hot state).
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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