CN113664036B - Rolling method for high-strength acid washed sheet - Google Patents
Rolling method for high-strength acid washed sheet Download PDFInfo
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- CN113664036B CN113664036B CN202010403668.6A CN202010403668A CN113664036B CN 113664036 B CN113664036 B CN 113664036B CN 202010403668 A CN202010403668 A CN 202010403668A CN 113664036 B CN113664036 B CN 113664036B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002253 acid Substances 0.000 title claims abstract description 15
- 230000009467 reduction Effects 0.000 claims abstract description 13
- 238000010079 rubber tapping Methods 0.000 claims abstract description 12
- 238000005461 lubrication Methods 0.000 claims abstract description 8
- 239000010687 lubricating oil Substances 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 12
- 229910000805 Pig iron Inorganic materials 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims 1
- 238000005406 washing Methods 0.000 abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 11
- 229910052742 iron Inorganic materials 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 210000003298 dental enamel Anatomy 0.000 description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 230000002441 reversible effect Effects 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
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000005554 pickling Methods 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
Abstract
The invention relates to a high-strength acid sheet washing rolling method, which comprises the following steps: step 1: the tapping temperature is controlled at 1200-1250 ℃; step 2: the furnace time is more than or equal to 200 minutes; step 3: the number of the rough rolling descaling groups is 6-8; step 4: the thickness of the intermediate blank is reduced from 35mm which is the minimum of design to 32mm; step 5: the number of the finish rolling descaling batch is 2-3; step 6: the threading speed is 10-12m/s; step 7: f1, setting 55-60% of the rolling reduction rate; step 8: f2 unit load is controlled within 2 t/mm; step 9: f3 unit load is controlled within 1.8 t/mm; step 10: f1-7 is fully input in lubrication rolling, wherein the proportion of F2 and F3 lubricating oil is more than or equal to 5 per mill; step 11: f1-7, fluctuation range of elevation of the rolling line is + -2.5 mm; step 12: f1-7 side guide plates are centered within a precision range of + -2 mm; step 13: f1-7 the horizontal fluctuation range of the lower supporting roller is +/-1 mm/m.
Description
Technical Field
The invention relates to a rolling method, in particular to a high-acid washing sheet rolling method, and belongs to the technical field of hot rolling and acid washing.
Background
The hot-rolled pickled plate is produced according to the production mode of the hot-rolled plate, and the steel plate meets the quality and application requirements of the cold-rolled plate, and mainly comprises three major types of steel for deep drawing compressors, steel for automobile structures and enamel steel. The pickled steel plate is relatively thick, and the thickness is generally 1.4-8mm, which exceeds the product outline range of a cold rolling mill, and can only be produced by hot rolling. Because the quality, such as the surface and the dimensional accuracy, of the cold-rolled sheet is far higher than that of a hot-rolled sheet, the production difficulty of the hot-rolled pickled sheet is great, particularly, the hot-rolled pickled sheet is washed by high acid, the tapping temperature is too high, and the defects of a temperature iron sheet cannot be controlled; the furnace outlet temperature is too low, the rolling load is large, the defects of roller system iron sheets are easy to cause, the defects of lower block steel roller marks caused by rolling breakage are caused, and the product quality requirement cannot be met.
Many works are done by various factories and research institutions for similar situations. Chinese patent application CN201711393932.7, "a pickled plate (coil) for stamping and a method for manufacturing same," uses ESP process to produce deep-drawn pickled plate. Chinese patent CN201310489332.6, a method for producing hot-rolled pickling-free plate by combining continuous strip casting with reduction annealing, proposes a method for producing hot-rolled pickling-free plate by combining continuous strip casting with reduction annealing. Chinese patent application CN201110086611.9, "a steel sheet and a method for producing water heater inner container enamel by a thin slab continuous casting and rolling line", provides a hot-rolled pickled steel sheet and a process method for producing water heater inner container enamel by an FTSR thin slab continuous casting and rolling line. No solution to the aforementioned problems has been found. Therefore, a new solution is urgently needed to solve the above technical problems.
Disclosure of Invention
The invention provides a high-strength acid sheet washing rolling method aiming at the problems in the prior art, and hot rolled sheet production mainly comprises four working procedures of heating, rough rolling, finish rolling and coiling, wherein the heating working procedure is used for heating a sheet billet, so that steel is rolled in an austenitic structure, the heating temperature is too high, iron scales generated in the heating process are difficult to remove, overheating and overburning are caused when serious, the sheet billet is directly scrapped, and meanwhile, the fuel consumption is high and the cost is increased. And rolling the slab into an intermediate slab in the rough rolling process, and removing the iron scales generated in the heating process and the iron scales generated in the rough rolling process through descaling. The finish rolling step is to roll the intermediate billet into a finished product, and to remove scale formed on the surface of the strip billet after rough rolling is completed. The coiling process mainly coils the strip steel after finish rolling. Normally, the thinner the finished product, the greater the rolling load and the longer the rolling time. The strip is high in temperature, heat can be dissipated to the outside in the rolling process, and the longer the rolling time is, the larger the temperature of the strip is reduced in the process. Therefore, the thin gauge rolling is difficult, and the heating temperature is generally higher, and the thickness of the intermediate billet is smaller. The pickling product has high requirements on surface quality, increases rolling difficulty, and mainly shows the following aspects: firstly, the rolling load is large, and besides the equipment capacity is required to be met, the F2 and F3 working rolls are easy to peel oxide films; secondly, the rolling stability is poor, and the same thickness deviation causes large plate shape change; the centering precision requirement of the horizontal and side guide plates of the rolling mill is high, otherwise, the rolling mill is easy to break and throw tail; thirdly, the surface quality requirement is high, and the defect of iron scales is not allowed to exist, so that all the iron scales need to be removed, and the regenerated iron scales need to be controllable after the descaling; the scheme provides a rolling method of a high-strength pickled plate with the thickness below 1.8mm, mainly aims at solving the problem of exposure in a finish rolling process, and works in heating, rough rolling and finish rolling processes, and particularly improves the overall temperature of a strip blank by properly improving the tapping temperature and controlling the time in the furnace in the heating process; the rough rolling procedure reduces the surface temperature by increasing descaling pass and the finish rolling load by reducing the thickness of the intermediate billet; in the finish rolling step, F2 and F3 unit loads are controlled to be within a predetermined range by using lubrication rolling, increasing F1 reduction ratio, or the like; the rolling stability is ensured through equipment precision control.
In order to achieve the above purpose, the technical scheme of the invention is as follows, a high-acid sheet washing rolling method, which comprises the following steps:
step 1: the tapping temperature is controlled at 1200-1250 ℃;
step 2: the furnace time is more than or equal to 200 minutes;
step 3: the number of the rough rolling descaling groups is 6-8;
step 4: the thickness of the intermediate blank is reduced from 35mm which is the minimum of design to 32mm;
step 5: the number of the finish rolling descaling batch is 2-3;
step 6: the threading speed is 10-12m/s;
step 7: f1, setting 55-60% of the rolling reduction rate;
step 8: f2 unit load is controlled within 2 t/mm;
step 9: f3 unit load is controlled within 1.8 t/mm;
step 10: f1-7 is fully input in lubrication rolling, wherein the proportion of F2 and F3 lubricating oil is more than or equal to 5 per mill;
step 11: f1-7, fluctuation range of elevation of the rolling line is + -2.5 mm;
step 12: f1-7 side guide plates are centered within a precision range of + -2 mm;
step 13: f1-7 the horizontal fluctuation range of the lower supporting roller is +/-1 mm/m.
As an improvement of the present invention, the step 3: the number of rough rolling descaling groups is 6-8, and the method is as follows: wherein the first group (descaling box) has a descaling strike force of 0.61-0.81g/mm, the second group has a descaling strike force of 1.27-1.56g/mm, and the problem of serious furnace pig iron skin caused by the heating temperature rise is eliminated by increasing the descaling strike force of the second group, and the other groups have normal descaling strike force.
As an improvement of the invention, the thickness of the intermediate blank is reduced from 35mm with the minimum design to 32mm, and the thickness is specifically as follows: the thickness of the strip blank after the 1 st-3 rd pass rolling of R1 rolling is respectively as follows: 186-188mm, 145-147mm and 116-118mm (thickness under hot state), and the thickness of the strip blank after the 1 st-3 rd pass rolling of R2 rolling is respectively as follows: 80-82mm, 52-50mm, 32.44mm (thickness in hot state).
As an improvement of the present invention, the step 7: the F1 rolling reduction is set to 55-60%, and the specific steps are as follows: the thickness of the strip steel after being rolled by the F1-7 rolling mill is 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 whole temperature of the strip blank is improved due to the increase of the tapping temperature; at the moment, higher descaling striking force is required 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; the descaling effect is improved and the surface oxidation after the descaling is reduced by increasing the number of the descaling groups; through lubrication rolling, the F1 rolling reduction rate is increased, and conditions are created for controlling F2 and F3 loads; and the equipment precision management standard is increased, and conditions are created for rolling stability. In implementation, the 1780 production line can stably produce specification products such as 1.4 x 960 and 1.6 x 1220 of automobile structural steel SAPH440 high-strength acid washed sheet, specification products such as 1.5 x 920 and 1.6 x 1000 of automobile structural steel QSTE420TM high-strength acid washed sheet, specification products such as automobile structural steel SPFH590 high-strength acid washed sheet, specification products such as 1.6 x 1050 and 1.8 x 1250, specification products such as enamel steel BTC245 high-strength acid washed sheet and specification products such as 1.8 x 1167, and the products are approved by customers.
The specific embodiment is as follows:
in order to enhance the understanding of the present invention, the following detailed description is made in connection with the embodiments.
Example 1: a high acid wash sheet rolling method comprising the steps of:
step 1: the tapping temperature is controlled at 1200-1250 ℃;
step 2: the furnace time is more than or equal to 200 minutes;
step 3: the number of the rough rolling descaling groups is 6-8;
step 4: the thickness of the intermediate blank is reduced from 35mm which is the minimum of design to 32mm;
step 5: the number of the finish rolling descaling batch is 2-3;
step 6: the threading speed is 10-12m/s;
step 7: f1, setting 55-60% of the rolling reduction rate;
step 8: f2 unit load is controlled within 2 t/mm;
step 9: f3 unit load is controlled within 1.8 t/mm;
step 10: f1-7 is fully input in lubrication rolling, wherein the proportion of F2 and F3 lubricating oil is more than or equal to 5 per mill;
step 11: f1-7, fluctuation range of elevation of the rolling line is + -2.5 mm;
step 12: f1-7 side guide plates are centered within a precision range of + -2 mm;
step 13: f1-7 the horizontal fluctuation range of the lower supporting roller is +/-1 mm/m.
The step 3: the number of rough rolling descaling groups is 6-8, and the method is as follows: wherein the first group (descaling box) has a descaling strike force of 0.61-0.81g/mm, the second group has a descaling strike force of 1.27-1.56g/mm, and the serious problem of furnace pig iron skin caused by the heating temperature rise is eliminated by increasing the descaling strike force of the second group.
The thickness of the intermediate blank is reduced from 35mm with the minimum design to 32mm, and the thickness is specifically as follows: the thickness of the strip blank after the 1 st-3 rd pass rolling of R1 rolling is respectively as follows: 186-188mm, 145-147mm and 116-118mm (thickness under hot state), and the thickness of the strip blank after the 1 st-3 rd pass rolling of R2 rolling is respectively as follows: 80-82mm, 52-50mm, 32.44mm (thickness in hot state).
The step 7: the F1 rolling reduction is set to 55-60%, and the specific steps are as follows: the thickness of the strip steel after being rolled by the F1-7 rolling mill is 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 intermediate billet with the thickness of 32mm is formed by rolling a plate blank with the thickness of 230mm, wherein rolling is carried out by a rolling mill R1 and a rolling mill R2 for three passes, wherein a roughing mill R1 is a two-roller reversible rolling mill, the diameter range of a working roller is 1350-1200mm, the length of a roller body is 1780mm, and the roller material is alloy cast steel or hot tool steel. The thickness of the strip blank after the 1 st-3 rd pass rolling of R1 rolling is 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 1550-1400mm, the length of a roller body is 1780mm, and the material is Cr5 forged steel; the diameter range of the working roll is 1250-1100mm, the length of the roll body is 1780, and the material of the roll is alloy cast steel or half high-speed steel. The thickness of the strip blank after the 1 st to 3 rd pass rolling of R2 rolling is respectively as follows: 80-82mm, 52-50mm, 32.44mm (thickness in hot state).
The high strong acid washing sheet with the thickness of 1.4-1.8mm is formed by rolling a 32mm thick intermediate blank by 7 finishing mills, wherein the 7 finishing mills are four-high 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 the roll body of all working rolls is 2080mm, the diameter range of the working roll of the F1 rolling mill is 835-480 mm, the diameter range of the working roll of the F2 rolling mill is 810-750 mm, 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 rolls 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 high nickel-chromium infinite chilled cast iron. The thickness of the strip steel after being rolled by the F1-7 rolling mill is 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).
Because the tapping temperature is higher, in order to ensure the descaling effect, the number of descaling nozzles of the first group (descaling box) for rough rolling is 25, the group flow is 125-160t/h, the jet width is 1782mm, the striking force is 0.61-0.81g/mm, the number of nozzles of the second group is 24, the group flow is 248-307t/h, the jet width is 1711mm, and the striking force is 1.27-1.56g/mm.
Application example 1:
SAPH440 steel grade 1.4 x 960 gauge rolling method.
Step 1: tapping temperature target 1240 ℃ and actual tapping temperature 1243 DEG C
Step 2: the target was 200 minutes at the oven time, and the actual oven time was 234 minutes.
Step 3: setting 6 groups for rough rolling descaling, and setting 6 groups for actual descaling. Wherein the first group (descaling box) has a descaling strike force of 0.61-0.81g/mm and the second group has a descaling strike force of 1.27-1.56g/mm.
Step 4: the intermediate blank thickness is targeted at 32mm, with a practical intermediate blank thickness of 32mm. The thicknesses of the strip blanks after 1-3 passes of the R1 rolling mill are 187mm, 146.1mm and 117.23mm respectively. The thickness of the strip blank after 1-3 passes of the R2 rolling mill is respectively as follows: 81.75mm, 51.08mm, 32.44mm.
Step 5: 2 groups of finish rolling descaling throwing use settings,
step 6: the threading speed was 11m/s.
Step 7: f1 reduction was set at 57.5%. F1-7, the thickness of the outlet strip blank after rolling is 13.8mm, 6.81mm,
3.87mm、2.60mm、1.87mm、1.59mm、1.41mm
Step 8: f2 unit load was controlled at 1980t/m.
Step 9: f3 unit load was controlled at 1782t/m.
Step 10: f1-7 is fully put into lubrication rolling, wherein the proportion of F2 and F3 lubricating oil is 6 per mill and 5 per mill respectively.
And 11, carrying out +/-2 mm of the elevation range of the F1-7 rolling line.
Step 12: f1-7 side guide plate centering accuracy range is +/-2 mm.
Step 13: f1-7 the horizontal fluctuation range of the lower supporting roller is +/-1 mm/m.
According to the process, 5 blocks can be rolled continuously on site, the on-site production is stable, and the product quality meets the requirements of users.
Application example 2: SPFH590 steel grade 1.8 x 1160 specification rolling method.
Step 1: tapping temperature target 1240 ℃ and actual tapping temperature 1238 DEG C
Step 2: the target was 200 minutes at oven time, and was actually 229 minutes at oven time.
Step 3: setting 6 groups for rough rolling descaling, and setting 6 groups for actual descaling. Wherein the first group (descaling box) has a descaling strike force of 0.61-0.81g/mm and the second group has a descaling strike force of 1.27-1.56g/mm.
Step 4: the intermediate blank thickness is targeted at 32mm, with a practical intermediate blank thickness of 32mm. The thickness of the strip blank after 1-3 passes of the R1 rolling mill is 186.8mm, 146mm and 117.12mm respectively. The thickness of the strip blank after 1-3 passes of the R2 rolling mill is respectively as follows: 81.85mm, 51.17mm, 32.44mm.
Step 5: and (5) setting 2 groups of finish rolling descaling operations.
Step 6: the threading speed was 11m/s.
Step 7: the F1 reduction was set to 55%. The thicknesses of the 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
Step 8: f2 unit load was controlled at 2000t/m.
Step 9: f3 unit load was controlled at 1798t/m.
Step 10: f1-7 is fully put into lubrication rolling, wherein the proportion of F2 and F3 lubricating oil is 6 per mill and 5 per mill respectively.
Step 11: f1-7.+ -. 2mm of the roll line elevation range.
Step 12: f1-7 side guide plate centering accuracy range is +/-2 mm.
Step 13: f1-7 the horizontal fluctuation range of the lower supporting roller is +/-1 mm/m.
According to the process, 4 blocks can be rolled continuously on site, the on-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 equivalent changes or substitutions made on the basis of the above-mentioned technical solutions fall within the scope of the present invention as defined in the claims.
Claims (1)
1. A method for rolling a high-acid washed sheet, comprising the steps of:
step 1: the tapping temperature is controlled at 1200-1250 ℃;
step 2: the furnace time is more than or equal to 200 minutes;
step 3: the number of the rough rolling descaling groups is 6-8;
step 4: the thickness of the intermediate blank is reduced from 35mm which is the minimum of design to 32mm;
step 5: the number of the finish rolling descaling batch is 2-3;
step 6: the threading speed is 10-12m/s;
step 7: f1, setting 55-60% of the rolling reduction rate;
step 8: f2 unit load is controlled within 2 t/mm;
step 9: f3 unit load is controlled within 1.8 t/mm;
step 10: f1-7 is fully input in lubrication rolling, wherein the proportion of F2 and F3 lubricating oil is more than or equal to 5 per mill;
step 11: f1-7, fluctuation range of elevation of the rolling line is + -2.5 mm;
step 12: f1-7 side guide plates are centered within a precision range of + -2 mm;
step 13: f1-7 the horizontal fluctuation range of the lower supporting roller is +/-1 mm/m;
wherein, the step 3: the number of rough rolling descaling groups is 6-8, and the method is as follows: wherein the first group of descaling striking power is 0.61-0.81g/mm, the second group of descaling striking power is 1.27-1.56g/mm, and the serious problem of furnace pig iron skin caused by the rising of the heating temperature is solved by improving the second group of descaling striking power;
the thickness of the intermediate blank is reduced from 35mm with the minimum design to 32mm, and the thickness is specifically as follows: the thickness of the strip blank after the 1 st to 3 rd pass rolling in the R1 rolling process in the hot state is respectively as follows: the thicknesses of the strip blanks after the 1 st pass to the 3 rd pass of rolling in the R2 rolling are respectively as follows: 80-82mm, 52-50mm, 32.44mm;
the step 7: the F1 rolling reduction is set to 55-60%, and the specific steps are as follows: the thickness of the strip steel after being rolled by the F1-7 rolling mill is 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.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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