CN110369519A - The operation of rolling method for controlling shape of 500MPa level low alloy high strength steel plate - Google Patents
The operation of rolling method for controlling shape of 500MPa level low alloy high strength steel plate Download PDFInfo
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- CN110369519A CN110369519A CN201910666476.1A CN201910666476A CN110369519A CN 110369519 A CN110369519 A CN 110369519A CN 201910666476 A CN201910666476 A CN 201910666476A CN 110369519 A CN110369519 A CN 110369519A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 140
- 238000000034 method Methods 0.000 title claims abstract description 79
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 78
- 239000010959 steel Substances 0.000 title claims abstract description 78
- 239000000956 alloy Substances 0.000 title claims abstract description 42
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 76
- 238000010438 heat treatment Methods 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 238000005516 engineering process Methods 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000001788 irregular Effects 0.000 abstract description 4
- 230000007704 transition Effects 0.000 abstract description 3
- 238000009749 continuous casting Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000000873 masking effect Effects 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
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Abstract
The invention discloses a kind of operation of rolling method for controlling shape of 500MPa level low alloy high strength steel plate, the method for controlling shape includes heating, roughing, finish rolling, control cooling and thermal straightening process.The present invention fully considers the temperature uniformity of slab and intermediate base entirety in heating and the operation of rolling, and after undergoing phase transition structural state uniformity, solve the problems, such as that cut deal steel grade generates Stress non-homogeneity and non-uniform temperature due to process aspect during the rolling process and histological difference generates stress and leads to irregular deformation.12~50mm of method for controlling shape steel plate thickness of the present invention, plate property: yield strength >=500MPa；Surface of steel plate unevenness is≤8mm/2m.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of operation of rolling plate of 500MPa level low alloy high strength steel plate
Type control method.
Background technique
With the continuous development of a variety of industries such as domestic construction industry, engineering machinery, pressure vessel, to the intensity requirement of steel grade
Also it is constantly increasing, is introducing foreign-made technology successively over especially close twenty or thirty year, China's Industrial Steels are low with Q235 and Q345
State based on rank steel cannot gradually satisfy social needs.Currently, the high strength steel of multiple ranks has been had developed, it is most high-strength
Degree is even more to require to reach 1000MPa or more, and 500MPa or more steel grade accounts for 10% or more of whole shares.High-strength steel not only will be strong
It spends performance indicator to be promoted to new height, is still required that in terms of template and strictly observe standard GB/T/T709-2006 requirement.
To obtain higher intensity index, in addition to continuing to continue to use and using solution strengthening effect, fine grain is also more relied on
Strengthen with precipitation enhancement and increase armor plate strength, therefore high-strength cut deal is rolled in Rolling production using aximal deformation value
Cooling provision is controlled after processing and rolling.Due to flow of metal uneven during rolling deformation and in control cooling procedure
Strip width and length direction Stress non-homogeneity, cause plate to deform, and due to deforming during the temperature drop of shaped sheet
Drag increases, and aligns in cold conditions postorder straightening process difficult, it is difficult to which the template requirement in being up to state standards needs when necessary
Carry out high-power cold straightener, press carry out it is smooth or by heat treatment destressing after carry out template aligning again, cause into
This increase and logistics burden, while template deterioration directly influences technical requirements in engineering project.Domestic pharmaceutical industry industry enterprise is high-strength
Steel board is sentenced useless rate due to template and reaches 21% or more.
Therefore it is badly in need of the rolling production method of the exploitation good thin gauge cut deal steel grade of hot-rolled state template.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of operation of rolling templates of 500MPa level low alloy high strength steel plate
Control method.The invention fully considers the temperature uniformity of slab and intermediate base entirety in heating and the operation of rolling, and
The uniformity of structural state after undergoing phase transition is solved cut deal steel grade and is generated due to process aspect during the rolling process
Stress non-homogeneity and non-uniform temperature and histological difference lead to the problem of stress and lead to irregular deformation.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of 500MPa level low alloy high strength steel plate
Operation of rolling method for controlling shape, the method for controlling shape include heating, roughing, finish rolling, control cool down and thermal straightening
Process, specific process step are as described below:
(1) heating process: slab heating temperature is 1100~1250 DEG C, and heating time is 7~12cm/min, blank soaking time
For 1.6~2.5cm/min；Heating finishes, the blank each point temperature difference≤30 DEG C；
(2) roughing operation: at 980~1080 DEG C, roughing broadening passage is rolled start rolling temperature using MAS, wedge-shaped segment △ h height with
Sotck thinkness ratio is 1:50~1:150, and horizontal segment L1 length is fixed value 400mm, wedge-shaped segment L2 200~600mm of length, broadening
2~6 passages of passage point carry out；4~8 passages of axial rolling point, single pass reduction ratio are 12~25%, and total reduction is 50~70%；
(3) finishing rolling step: single pass reduction ratio is 5~20%, and total reduction is 30~50%；The last three passages working roll line of finish rolling
Speed≤1.5m/s, and rate of deformation≤1s-1, the relaxation time is 10~50s after finish rolling；
(4) it controls cooling process: using laminar flow cooling technology, final cooling temperature is 450~650 DEG C, cooling rate≤10 DEG C/s；
(5) thermal straightening process: 400 DEG C of straightening temperature >, roller 0.24~1.2m/s of speed, the setting of straightener roll gap guarantees that rolled piece is thick
It spends and is plastically deformed depth >=70% on direction.
Step (2) of the present invention, rough rolling working roll use positive 0.05~0.20mm of convexity.
Step (3) of the present invention, precision rolling working roll use plain-barreled roll.
Step (3) of the present invention, before rolling Hi-Stren steel kind, finishing mill uses milimeter number in finishing rolling step
Control is in 6~12 ㎞.
Step (4) of the present invention, plate enter cooling system and carry out cooling using shielding function end to end, cover length
0.3~1.0m, to reduce plate head-tail and the intermediate temperature difference.
Step (2) of the present invention is purged after roughing using water beam；The step (3) is purged before finish rolling using water beam.
Step (4) of the present invention, roller table speed are 0.35~1.0m/s, and upper and lower water is than control 1.6~2.4.
Step (5) of the present invention, straightener gap preset is in 11.5~50mm.
12~50mm of steel plate thickness of method for controlling shape production of the present invention, plate property: yield strength >=
500MPa。
Method for controlling shape surface of steel plate unevenness of the present invention is≤8mm/2m.
Mentality of designing of the present invention:
In order to reduce, cut deal steel grade generates Stress non-homogeneity due to process aspect during the rolling process and template is caused to produce
Raw irregular deformation, while considering that the reason of slab generates irregular deformation predominantly non-uniform temperature and histological difference generate
Stress and cause, therefore fully consider the temperature uniformity of slab and intermediate base entirety in heating and Rolling Production during,
And after undergoing phase transition structural state uniformity.
Blank heating is mainly to reduce all directions temperature difference of blank using longer heating coefficient and soaking time, as far as possible
Realize in thermal deformation process metal flow uniformity, while for prevent in the hot rolling plate face water make plate face region temperature
Degree reduces, therefore matches standby host post-purge device after two-stand mills, is purged using water beam after roughing mill, before finishing mill, with
Reduce plate face water residual.
It is rolled in rough rolling process using MAS, so that " surplus capacity " of sheet material edge metal is made up sheet material edge unrestricted spread and draw
The inhomogeneous deformation risen.
" the distortion energy " that can make plate accumulation grain deformation in finishing stands using lower rate of deformation, sends out phase transformation
Raw process is more abundant, to obtain the institutional framework of more fine uniform.
For prevent thicker plate material red temperature it is higher when plate in thickness direction there is larger tissue and performance difference,
Difference in this respect can be reduced using lesser cooling rate, lower final cooling temperature, while being prevented using masking technique end to end
Plate end to end with intermediate diversity.
Low-alloy high-strength steel plate method for testing performance canonical reference GB/T1591-2018 of the present invention；Surface of steel plate is uneven
Spend detection method canonical reference GB/T709-2006.
The beneficial effects of adopting the technical scheme are that 1, blank heating of the present invention is using longer heating
Several and soaking time reduces all directions temperature difference of blank, realizes the uniformity of the metal flow in thermal deformation process.2, originally
It is rolled in invention rough rolling process using MAS, makes up " surplus capacity " of sheet material edge metal caused by sheet material edge unrestricted spread
Inhomogeneous deformation.3, " the distortion of plate accumulation grain deformation can be made in finishing stands of the present invention using lower rate of deformation
Can ", keep phase transformation generating process more abundant, to obtain the institutional framework of more fine uniform.4, the present invention is using lesser
Cooling rate, lower final cooling temperature reduce plate in width, length direction and larger tissue and performance difference occur, adopt simultaneously
With masking technique end to end prevent plate end to end with intermediate diversity.5, the low-alloy high-strength steel plate table of control method production of the present invention
Face unevenness is≤8mm/2m.
Detailed description of the invention
Fig. 1 is width direction sectional schematic diagram after MAS rolling, △ h=1.5mm, L1=350mm, L2=400mm.
Specific embodiment
Present invention will be explained in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
For the present embodiment low-alloy high-strength steel plate with a thickness of 20mm, continuous casting billet specification is 280*1800*2800mm, low-alloy high-strength
The operation of rolling method for controlling shape for spending steel plate includes heating, roughing, finish rolling, control cooling and thermal straightening process, specific work
That steps are as follows is described for skill:
(1) heating process: slab heating temperature is 1210 DEG C, heating time 7.5cm/min, and blank soaking time is 1.8cm/
Min, heating finish, 25 DEG C of the blank each point temperature difference；
(2) roughing operation: 1063 DEG C of start rolling temperature, roughing broadening passage is rolled using MAS, and wedge-shaped segment △ h height and blank are thick
Degree is than being 1:90, and horizontal segment L1 length is fixed value 400mm, wedge-shaped segment L2 length 320mm, and broadening 4 passages of passage point carry out, turn
Steel passage is carried out using one direction；Broaden axial rolling point 6 passages after passage, passage gap values between rollers be set as 180mm, 152mm, 125mm,
99mm, 81mm, 70mm, single pass reduction ratio 15%, total reduction 69.75%；Rough rolling working roll uses positive convexity 0.05mm；It is intermediate
Base is with a thickness of 3 times of finished product thickness 60mm；It is purged after roughing using water beam；
(3) it finishing rolling step: is purged before finish rolling using water beam, single pass reduction ratio 11%, total reduction 31.25%；Finish rolling last three
Passage working roll linear velocity 1.25m/s, rate of deformation 0.8s-1；Precision rolling working roll uses plain-barreled roll, and finishing mill is 6 using milimeter number
㎞；Milling train blows off plate face residual water using machine post-purge；The relaxation time is 20s after finish rolling；
(4) it controls cooling process: using laminar flow cooling technology, final cooling temperature is 480 DEG C, roller table speed 1m/s, upper and lower water
Than control 1.9,5 DEG C/s of cooling rate；Plate enters cooling system and carries out cooling using shielding function end to end, covers length
1m, to reduce plate head-tail and the intermediate temperature difference；
(5) thermal straightening process: 410 DEG C of straightening temperature, straightener gap preset is in 18.9mm, roller speed 0.25m/s, straightener roll gap
Setting guarantee rolled piece thickness direction on be plastically deformed depth 73%.
Low-alloy high-strength finished steel plate specification is 20*2200*12000mm, plate property: surrender after the present embodiment rolling
Intensity 560MPa；Steel plate passes through surface examination, and maximum unevenness is 5mm/2m, complies fully with requirements of the national standard.
Embodiment 2
For the present embodiment low-alloy high-strength steel plate with a thickness of 16mm, continuous casting billet specification is 250*2100*280mm, low-alloy high-strength
The operation of rolling method for controlling shape for spending steel plate includes heating, roughing, finish rolling, control cooling and thermal straightening process, specific work
That steps are as follows is described for skill:
(1) heating process: slab heating temperature is 1210 DEG C, heating time 8.4cm/min, and blank soaking time is 2.5cm/
Min, heating finish, 21 DEG C of the blank each point temperature difference；
(2) roughing operation: 1060 DEG C of start rolling temperature, roughing broadening passage is rolled using MAS, and wedge-shaped segment △ h height and blank are thick
Degree is than being 1:70, and horizontal segment L1 length is fixed value 400mm, wedge-shaped segment L2 length 430mm, and broadening 4 passages of passage point carry out, turn
Steel passage is carried out using one direction；Broaden axial rolling point 6 passages after passage, passage gap values between rollers be set as 170mm, 142mm, 115mm,
99mm, 78mm, 56mm, single pass reduction ratio 22%, total reduction 67%；Rough rolling working roll uses positive convexity 0.05mm；It is intermediate
Base is with a thickness of 3.5 times of finished product thickness 56mm；It is purged after roughing using water beam；
(3) finishing rolling step: being purged before finish rolling using water beam, and single pass reduction ratio is 10%, total reduction 33%；Finish rolling last three
Task roller linear velocity 1.25m/s, rate of deformation 0.6s-1；Precision rolling working roll uses plain-barreled roll, and finishing mill is 6 using milimeter number
㎞；The relaxation time is 15s after finish rolling；
(4) it controls cooling process: using laminar flow cooling technology, final cooling temperature is 510 DEG C, roller table speed 1m/s, upper and lower water
Than control 1.9,5 DEG C/s of cooling rate；Plate enters cooling system and carries out cooling using shielding function end to end, covers length
1m, to reduce plate head-tail and the intermediate temperature difference；
(5) thermal straightening process: 420 DEG C of straightening temperature, straightener gap preset is in 14.7mm, roller speed 0.25m/s, straightener roll gap
Setting guarantee rolled piece thickness direction on be plastically deformed depth 71%.
Low-alloy high-strength finished steel plate specification is 16*2500*12000mm, plate property: surrender after the present embodiment rolling
Intensity 523MPa；Steel plate passes through surface examination, and maximum unevenness is 6mm/2m, complies fully with requirements of the national standard.
Embodiment 3
For the present embodiment low-alloy high-strength steel plate with a thickness of 22mm, continuous casting billet specification is 250*1800*2500mm, low-alloy high-strength
The operation of rolling method for controlling shape for spending steel plate includes heating, roughing, finish rolling, control cooling and thermal straightening process, specific work
That steps are as follows is described for skill:
(1) heating process: slab heating temperature is 1130 DEG C, heating time 10cm/min, and blank soaking time is 1.9cm/
Min, heating finish, 28 DEG C of the blank each point temperature difference；
(2) roughing operation: 1023 DEG C of start rolling temperature, roughing broadening passage is rolled using MAS, and wedge-shaped segment △ h height and blank are thick
Degree is than being 1:110, and horizontal segment L1 length is fixed value 400mm, wedge-shaped segment L2 length 370mm, and broadening 2 passages of passage point carry out,
Turn steel passage to carry out using one direction；Broaden axial rolling point 4 passages after passage, passage gap values between rollers be set as 180mm, 152mm,
125mm, 99mm, single pass reduction ratio are 13%, total reduction 52%；Rough rolling working roll uses positive convexity 0.08mm；Intermediate base
With a thickness of 3.5 times of finished product thickness 77mm；It is purged after roughing using water beam；
(3) finishing rolling step: being purged before finish rolling using water beam, and single pass reduction ratio is 7%, total reduction 33%；Finish rolling last three
Passage working roll linear velocity 1.15m/s, rate of deformation 0.9s-1；Precision rolling working roll uses plain-barreled roll, and finishing mill is using milimeter number
10㎞；The relaxation time is 30s after finish rolling；
(4) it controls cooling process: using laminar flow cooling technology, final cooling temperature is 550 DEG C, roller table speed 0.6m/s, upper and lower water
Amount than control 1.7,6 DEG C/s of cooling rate；Plate enters cooling system and carries out cooling using shielding function end to end, covers length
0.5m, to reduce plate head-tail and the intermediate temperature difference；
(5) thermal straightening process: 405 DEG C of straightening temperature, straightener gap preset is in 15.8mm, roller speed 0.30m/s, straightener roll gap
Setting guarantee rolled piece thickness direction on be plastically deformed depth 72%.
Low-alloy high-strength finished steel plate specification is 22*2500*27000mm, plate property: surrender after the present embodiment rolling
Intensity 523MPa；Steel plate passes through surface examination, and maximum unevenness is 5mm/2m, complies fully with requirements of the national standard.
Embodiment 4
For the present embodiment low-alloy high-strength steel plate with a thickness of 30mm, continuous casting billet specification is 360*2100*2700mm, low-alloy high-strength
The operation of rolling method for controlling shape for spending steel plate includes heating, roughing, finish rolling, control cooling and thermal straightening process, specific work
That steps are as follows is described for skill:
(1) heating process: slab heating temperature is 1170 DEG C, heating time 9.5cm/min, and blank soaking time is 2.2cm/
Min, heating finish, 23 DEG C of the blank each point temperature difference；
(2) roughing operation: 1045 DEG C of start rolling temperature, roughing broadening passage is rolled using MAS, and wedge-shaped segment △ h height and blank are thick
Degree is than being 1:70, and horizontal segment L1 length is fixed value 400mm, wedge-shaped segment L2 length 510mm, and broadening 5 passages of passage point carry out, turn
Steel passage is carried out using one direction；Broaden axial rolling point 7 passages after passage, passage gap values between rollers be set as 180mm, 152mm, 125mm,
112mm, 99mm, 81mm, 70mm, single pass reduction ratio are 15%, total reduction 65%；Rough rolling working roll uses positive convexity
0.10mm；Workpiece thickness is 3 times of finished product thickness 90mm；It is purged after roughing using water beam；
(3) finishing rolling step: being purged before finish rolling using water beam, and single pass reduction ratio is 11%, total reduction 43%；Finish rolling last three
Passage working roll linear velocity 1.45m/s, rate of deformation 0.5s-1；Precision rolling working roll uses plain-barreled roll, and finishing mill is 9 using milimeter number
㎞；The relaxation time is 35s after finish rolling；
(4) it controls cooling process: using laminar flow cooling technology, final cooling temperature is 580 DEG C, roller table speed 0.5m/s, upper and lower water
Amount than control 2.3,8 DEG C/s of cooling rate；Plate enters cooling system and carries out cooling using shielding function end to end, covers length
0.5m, to reduce plate head-tail and the intermediate temperature difference；
(5) thermal straightening process: 425 DEG C of straightening temperature, straightener gap preset is in 29.5mm, roller speed 0.4m/s, straightener roll gap
Setting guarantee rolled piece thickness direction on be plastically deformed depth 75%.
Low-alloy high-strength finished steel plate specification is 30*2400*18000mm, plate property: surrender after the present embodiment rolling
Intensity 533MPa；Steel plate passes through surface examination, and maximum unevenness is 6mm/2m, complies fully with requirements of the national standard.
Embodiment 5
For the present embodiment low-alloy high-strength steel plate with a thickness of 14mm, continuous casting billet specification is 250*1800*2400mm, low-alloy high-strength
The operation of rolling method for controlling shape for spending steel plate includes heating, roughing, finish rolling, control cooling and thermal straightening process, specific work
That steps are as follows is described for skill:
(1) heating process: slab heating temperature is 1195 DEG C, heating time 11.5cm/min, and blank soaking time is
2.4cm/min, heating finish, 13 DEG C of the blank each point temperature difference；
(2) roughing operation: 1044 DEG C of start rolling temperature, roughing broadening passage is rolled using MAS, and wedge-shaped segment △ h height and blank are thick
Degree is than being 1:125, and horizontal segment L1 length is fixed value 400mm, wedge-shaped segment L2 length 535mm, and broadening 3 passages of passage point carry out,
Turn steel passage to carry out using one direction；Broaden axial rolling point 8 passages after passage, passage gap values between rollers be set as 180mm, 152mm,
142mm, 135mm, 125mm, 99mm, 81mm, 70mm, single pass reduction ratio are 17%, total reduction 66%；Rough rolling working roll makes
With positive convexity 0.12mm；Workpiece thickness is 4 times of finished product thickness 56mm；It is purged after roughing using water beam；
(3) finishing rolling step: being purged before finish rolling using water beam, and single pass reduction ratio is 16%, total reduction 34%；Finish rolling last three
Passage working roll linear velocity 1.05m/s, rate of deformation 0.7s-1；Precision rolling working roll uses plain-barreled roll, and finishing mill is 7 using milimeter number
㎞；The relaxation time is 25s after finish rolling；
(4) it controls cooling process: using laminar flow cooling technology, final cooling temperature is 620 DEG C, roller table speed 0.8m/s, upper and lower water
Amount than control 2.1,8 DEG C/s of cooling rate；Plate enters cooling system and carries out cooling using shielding function end to end, covers length
0.7m, to reduce plate head-tail and the intermediate temperature difference；
(5) thermal straightening process: 422 DEG C of straightening temperature, straightener gap preset is in 13.7mm, roller speed 0.5m/s, straightener roll gap
Setting guarantee rolled piece thickness direction on be plastically deformed depth 76%.
Low-alloy high-strength finished steel plate specification is 14*2400*30500mm, plate property: surrender after the present embodiment rolling
Intensity 545MPa；Steel plate passes through surface examination, and maximum unevenness is 7mm/2m, complies fully with requirements of the national standard.
Embodiment 6
For the present embodiment low-alloy high-strength steel plate with a thickness of 12mm, continuous casting billet specification is 220*1600*2700mm, low-alloy high-strength
The operation of rolling method for controlling shape for spending steel plate includes heating, roughing, finish rolling, control cooling and thermal straightening process, specific work
That steps are as follows is described for skill:
(1) heating process: slab heating temperature is 1235 DEG C, heating time 11.5cm/min, and blank soaking time is
2.1cm/min, heating finish, 22 DEG C of the blank each point temperature difference；
(2) roughing operation: 1039 DEG C of start rolling temperature, roughing broadening passage is rolled using MAS, and wedge-shaped segment △ h height and blank are thick
Degree is than being 1:100, and horizontal segment L1 length is fixed value 400mm, wedge-shaped segment L2 length 230mm, and broadening 5 passages of passage point carry out,
Turn steel passage to carry out using one direction；Broaden axial rolling point 8 passages after passage, passage gap values between rollers be set as 180mm, 152mm,
142mm, 135mm, 1125mm, 99mm, 81mm, 70mm, single pass reduction ratio are 17%, total reduction 60%；Rough rolling working roll
Use positive convexity 0.05mm；Workpiece thickness is 4 times of finished product thickness 60mm；It is purged after roughing using water beam；
(3) finishing rolling step: being purged before finish rolling using water beam, and single pass reduction ratio is 8%, total reduction 40%；Finish rolling last three
Passage working roll linear velocity 0.85m/s, rate of deformation 0.5s-1；Precision rolling working roll uses plain-barreled roll, and finishing mill is 7 using milimeter number
㎞；The relaxation time is 40s after finish rolling；
(4) it controls cooling process: using laminar flow cooling technology, final cooling temperature is 525 DEG C, roller table speed 0.8m/s, upper and lower water
Amount than control 1.8,4 DEG C/s of cooling rate；Plate enters cooling system and carries out cooling using shielding function end to end, covers length
0.7m, to reduce plate head-tail and the intermediate temperature difference；
(5) thermal straightening process: 435 DEG C of straightening temperature, straightener gap preset is in 14.7mm, roller speed 0.6m/s, straightener roll gap
Setting guarantee rolled piece thickness direction on be plastically deformed depth 78%.
Low-alloy high-strength finished steel plate specification is 12*2200*25000mm, plate property: surrender after the present embodiment rolling
Intensity 549MPa；Steel plate passes through surface examination, and maximum unevenness is 3mm/2m, complies fully with requirements of the national standard.
Embodiment 7
For the present embodiment low-alloy high-strength steel plate with a thickness of 40mm, continuous casting billet specification is 480*1800*2700mm, low-alloy high-strength
The operation of rolling method for controlling shape for spending steel plate includes heating, roughing, finish rolling, control cooling and thermal straightening process, specific work
That steps are as follows is described for skill:
(1) heating process: slab heating temperature is 1250 DEG C, heating time 7cm/min, and blank soaking time is 2.5cm/
Min, heating finish, 10 DEG C of the blank each point temperature difference；
(2) roughing operation: 1080 DEG C of start rolling temperature, roughing broadening passage is rolled using MAS, and wedge-shaped segment △ h height and blank are thick
Degree is than being 1:50, and horizontal segment L1 length is fixed value 400mm, wedge-shaped segment L2 length 200mm, and broadening 6 passages of passage point carry out, turn
Steel passage is carried out using one direction；Broaden axial rolling point 6 passages after passage, passage gap values between rollers be set as 180mm, 152mm, 125mm,
99mm, 81mm, 70mm, single pass reduction ratio are 25%, total reduction 70%；Rough rolling working roll uses positive convexity 0.15mm；In
Between base with a thickness of 2.5 times of finished product thickness 100mm；It is purged after roughing using water beam；
(3) finishing rolling step: being purged before finish rolling using water beam, and single pass reduction ratio is 20%, total reduction 50%；Finish rolling last three
Passage working roll linear velocity 1.50m/s, rate of deformation 0.4s-1；Precision rolling working roll uses plain-barreled roll, and finishing mill is using milimeter number
12㎞；The relaxation time is 10s after finish rolling；
(4) it controls cooling process: using laminar flow cooling technology, final cooling temperature is 450 DEG C, roller table speed 0.7m/s, upper and lower water
Amount than control 1.6,10 DEG C/s of cooling rate；Plate enters cooling system and carries out cooling using shielding function end to end, masking length
0.4m is spent, to reduce plate head-tail and the intermediate temperature difference；
(5) thermal straightening process: 405 DEG C of straightening temperature, straightener gap preset in 50mm, roller speed 0.24m/s, straightener roll gap
Setting guarantees to be plastically deformed depth 72.5% on rolled piece thickness direction.
Low-alloy high-strength finished steel plate specification is 40*2400*14000mm, plate property surrender after the present embodiment rolling
Strong 528MPa；Steel plate passes through surface examination, and maximum unevenness is 3mm/2m, complies fully with requirements of the national standard.
Embodiment 8
For the present embodiment low-alloy high-strength steel plate with a thickness of 50mm, continuous casting billet specification is 580*1800*2800mm, low-alloy high-strength
The operation of rolling method for controlling shape for spending steel plate includes heating, roughing, finish rolling, control cooling and thermal straightening process, specific work
That steps are as follows is described for skill:
(1) heating process: slab heating temperature is 1100 DEG C, heating time 12cm/min, and blank soaking time is 1.6cm/
Min, heating finish, 30 DEG C of the blank each point temperature difference；
(2) roughing operation: 980 DEG C of start rolling temperature, roughing broadening passage is rolled using MAS, wedge-shaped segment △ h height and sotck thinkness
Than for 1:150, horizontal segment L1 length is fixed value 400mm, wedge-shaped segment L2 length 600mm, broadening 4 passages of passage point carry out, turn
Steel passage is carried out using one direction；Broaden axial rolling point 6 passages after passage, passage gap values between rollers be set as 180mm, 152mm, 142mm,
135mm, 1125mm, 99mm, single pass reduction ratio are 12%, total reduction 50%；Rough rolling working roll uses positive convexity 0.20mm；
Workpiece thickness is 3 times of finished product thickness 150mm；It is purged after roughing using water beam；
(3) finishing rolling step: being purged before finish rolling using water beam, and single pass reduction ratio is 5%, total reduction 30%；Finish rolling last three
Passage working roll linear velocity 1.0m/s, rate of deformation 1.0s-1；Precision rolling working roll uses plain-barreled roll, and finishing mill is 6 using milimeter number
㎞；The relaxation time is 50s after finish rolling；
(4) it controls cooling process: using laminar flow cooling technology, final cooling temperature is 650 DEG C, roller table speed 0.35m/s, above and below
Water than control 2.4,4 DEG C/s of cooling rate；Plate enters cooling system and carries out cooling using shielding function end to end, masking length
0.3m is spent, to reduce plate head-tail and the intermediate temperature difference；
(5) thermal straightening process: 418 DEG C of straightening temperature, straightener gap preset is in 11.5mm, roller speed 1.2m/s, straightener roll gap
Setting guarantee rolled piece thickness direction on be plastically deformed depth 70%.
Low-alloy high-strength finished steel plate specification is 50*2200*20000mm, plate property: surrender after the present embodiment rolling
Intensity 502MPa；Steel plate passes through surface examination, and maximum unevenness is 6mm/2m, complies fully with requirements of the national standard.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (10)
- The operation of rolling method for controlling shape of 1.500MPa level low alloy high strength steel plate, which is characterized in that the plate form control side Method includes heating, roughing, finish rolling, control is cooling and thermal straightening process, specific process step are as described below:(1) heating process: slab heating temperature is 1100~1250 DEG C, and heating time is 7~12cm/min, blank soaking time For 1.6~2.5cm/min；Heating finishes, the blank each point temperature difference≤30 DEG C；(2) roughing operation: at 980~1080 DEG C, roughing broadening passage is rolled start rolling temperature using MAS, wedge-shaped segment △ h height with Sotck thinkness ratio is 1:50~1:150, and horizontal segment L1 length is fixed value 400mm, wedge-shaped segment L2 200~600mm of length, broadening 2~6 passages of passage point carry out；4~8 passages of axial rolling point, single pass reduction ratio are 12~25%, and total reduction is 50~70%；(3) finishing rolling step: single pass reduction ratio is 5~20%, and total reduction is 30~50%；The last three passages working roll line of finish rolling Speed≤1.5m/s, and rate of deformation≤1s-1, the relaxation time is 10~50s after finish rolling；(4) it controls cooling process: using laminar flow cooling technology, final cooling temperature is 450~650 DEG C, cooling rate≤10 DEG C/s；(5) thermal straightening process: 400 DEG C of straightening temperature >, roller 0.24~1.2m/s of speed, the setting of straightener roll gap guarantees that rolled piece is thick It spends and is plastically deformed depth >=70% on direction.
- 2. the operation of rolling method for controlling shape of 500MPa level low alloy high strength steel plate according to claim 1, feature It is, the step (2), rough rolling working roll uses positive 0.05~0.20mm of convexity.
- 3. the operation of rolling method for controlling shape of 500MPa level low alloy high strength steel plate according to claim 1, feature It is, the step (3), precision rolling working roll uses plain-barreled roll.
- 4. the operation of rolling plate form control side of 500MPa level low alloy high strength steel plate according to claim 1 to 3 Method, which is characterized in that the step (3), before rolling Hi-Stren steel kind, finishing mill uses milimeter number in finishing rolling step Control is in 6~12 ㎞.
- 5. the operation of rolling plate form control side of 500MPa level low alloy high strength steel plate according to claim 1 to 3 Method, which is characterized in that the step (4), plate enter cooling system and carries out cooling using shielding function end to end, cover length 0.3~1.0m.
- 6. the operation of rolling plate form control side of 500MPa level low alloy high strength steel plate according to claim 1 to 3 Method, which is characterized in that the step (2) is purged after roughing using water beam；The step (3) is purged before finish rolling using water beam.
- 7. the operation of rolling plate form control side of 500MPa level low alloy high strength steel plate according to claim 1 to 3 Method, which is characterized in that the step (4), roller table speed are 0.35~1.0m/s, and upper and lower water is than control 1.6~2.4.
- 8. the operation of rolling plate form control side of 500MPa level low alloy high strength steel plate according to claim 1 to 3 Method, which is characterized in that the step (5), straightener gap preset is in 11.5~50mm.
- 9. the operation of rolling plate form control side of 500MPa level low alloy high strength steel plate according to claim 1 to 3 Method, which is characterized in that 12~50mm of steel plate thickness of the method for controlling shape production, plate property: yield strength >= 500MPa。
- 10. the operation of rolling plate form control of 500MPa level low alloy high strength steel plate according to claim 1 to 3 Method, which is characterized in that the method for controlling shape surface of steel plate unevenness is≤8mm/2m.
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| CN115305330A (en) * | 2022-07-28 | 2022-11-08 | 鞍钢股份有限公司 | Shape control method for 460 MPa-grade thick steel plate with thickness greater than 50mm |
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Denomination of invention: Method for controlling the shape of 500MPa low alloy high-strength steel plate during rolling process Granted publication date: 20201002 Pledgee: Bank of Cangzhou Limited by Share Ltd. Yutian branch Pledgor: TANGSHAN HEAVY PLATE CO.,LTD.|TANGSHAN IRON&STEEL GROUP Co.,Ltd.|HBIS COMPANY LIMITED TANGSHAN BRANCH Registration number: Y2024980001649 |