CN103627868B - Improve the production method of yield strength 345MPa level 10 ~ 12mm Plate Steel toughness - Google Patents
Improve the production method of yield strength 345MPa level 10 ~ 12mm Plate Steel toughness Download PDFInfo
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Abstract
The invention discloses a kind of production method improving yield strength 345MPa level 10 ~ 12mm Plate Steel toughness, step comprises: heating of plate blank, and slab adopts 250mm, and described slab tapping temperature is 1180 ~ 1220 DEG C, and heat-up time is 270 ~ 450 minutes; Be rolled the slab after heating, in first stage rolling technology, start rolling temperature is 1170 ~ 1210, roll speed is 1.5 ~ 2m/s, finishing temperature >=1010 DEG C, open rolling thickness is slab thickness 250mm, requires single pass draft >=12% of steel plate when first stage high temperature extends rolling; In subordinate phase rolling technology, open rolling thickness is 3 times of finished steel plate thickness, start rolling temperature is 960 ~ 980 DEG C, finishing temperature is 800 ~ 830 DEG C, have draft >=15% of two passages at least, roll speed is followed successively by 3 ~ 4m/s, 3.3 ~ 4.3m/s, 3.5 ~ 4.5m/s, 3.8 ~ 4.7m/s and 4 ~ 5m/s; Steel plate thickness after thermal straightening machine aligning is 10 ~ 12mm; Roll steel plate and align 3 times through thermal straightening machine, straightening temperature is more than or equal to 400 DEG C.
Description
Technical field
The technology of the present invention belongs to material processing field, specifically, relates to a kind of production method improving yield strength 345MPa level 10 ~ 12mm Plate Steel toughness.
Background technology
Yield strength is low-alloy high-strength steel plate widespread use in the every field of national economy of 345MPa rank.The clean energy wind-powered electricity generation that present country is greatly developing, the tower bar main raw rotated for support blade is exactly the low-alloy high-strength steel plate that yield strength is 345MPa rank, wherein the steel plate of 10 ~ 12mm think gauge account for significant proportion, and these steel plates are all produce with reversible wide and heavy plate mill.
Now for improving the comprehensive mechanical property of steel plate, all generally adopt controlled rolling during rolling, 10 ~ 12mm Plate Steel is due to thinner thickness, the flatness defect such as shape wave, warpage is easily there is during rolling, finishing temperature is lower, and this flatness defect is more obvious, and in 10 ~ 12mm thick steel plates operation of rolling, temperature drop is fast, reversible wide and heavy plate mill roll speed is comparatively slow simultaneously, and rolling time is longer.In order to avoid, finishing temperature is low, the plate shape of steel plate is not easy to control, and secondary start rolling temperature usually arranges higher when production 10 ~ 12mm thick steel plates by wide and heavy plate mill.Because secondary start rolling temperature is higher, can not refinement or broken austenite crystal effectively during rolling, cause finished steel plate coarse grains, and easily occur mixed crystal phenomenon, final finished steel plate poor toughness.For improving steel sheet tissue, improving its toughness, usually needing steel sheet thermal treatment, heat treatment mode is normalizing or modified, and after thermal treatment, the toughness of steel plate significantly promotes, but thermal treatment makes the manufacturing process of steel plate complicated, management difficulty, manufacturing cycle extend, and manufacturing cost raises, and energy consumption strengthens.Now more to the impelling strength discussion research improving Plate Steel, to how improving steel-sheet impelling strength discussion research then seldom see.
Summary of the invention
Technical problem solved by the invention is to provide a kind of production method improving yield strength 345MPa level 10 ~ 12mm Plate Steel toughness, effectively can improve the toughness of yield strength 345MPa level 10 ~ 12mm Plate Steel.
Technical scheme is as follows:
Improve a production method for yield strength 345MPa level 10 ~ 12mm Plate Steel toughness, step comprises:
Heating of plate blank; Described slab adopts 250mm, and described slab tapping temperature is 1180 ~ 1220 DEG C, and heat-up time is 270 ~ 450 minutes;
Slab after heating is rolled; Rolling in two stages, in first stage rolling technology, start rolling temperature is 1170 ~ 1210, roll speed is 1.5 ~ 2m/s, finishing temperature >=1010 DEG C, open rolling thickness is slab thickness 250mm, and the steel plate thickness when first stage, rolling completed is the open rolling thickness of subordinate phase steel plate, requires single pass draft >=12% of steel plate when first stage high temperature extends rolling; In subordinate phase rolling technology, open rolling thickness is 3 times of finished steel plate thickness, thickness when rolling completes is finished steel plate thickness, finish rolling rolling 5 passage, subordinate phase start rolling temperature is 960 ~ 980 DEG C, finishing temperature is 800 ~ 830 DEG C, draft >=15% having two passages at least is required during subordinate phase rolling, the roll speed of first is 3 ~ 4m/s, the roll speed of second is 3.3 ~ 4.3m/s, the roll speed in the 3rd road is 3.5 ~ 4.5m/s, and the roll speed in the 4th road is 3.8 ~ 4.7m/s, and the roll speed in the 5th road is 4 ~ 5m/s;
The steel plate that subordinate phase rolls is aligned through thermal straightening machine, finished steel plate yield strength 345MPa level, thickness 10 ~ 12mm; Roll steel plate and align 3 times through thermal straightening machine, straightening temperature is more than or equal to 400 DEG C.
Further: in continuously cast bloom heat-processed, slab tapping temperature is 1220 DEG C, 270 minutes heat-up times; First stage start rolling temperature is 1210 DEG C, finishing temperature 1010 DEG C, and roll speed is 2m/s, and the steel plate thickness that the first stage rolls is 30mm, and during first stage high temperature extension rolling, the draft of single pass is minimum is 12%, and the first stage is rolling 8 passages altogether; The open rolling thickness of subordinate phase steel plate is 30mm, subordinate phase rolling 5 passages, subordinate phase start rolling temperature is 980 DEG C, finishing temperature 830 DEG C, subordinate phase rolling 5 passages, the draft of single pass is respectively 16.7%, 24%, 21.1%, 19.3% and 16.7%, and the roll speed of corresponding passage is respectively 3.5m/s, 3.8m/s, 4.2m/s, 4.5m/s and 4.8m/, and the steel plate thickness that subordinate phase rolls is 10mm.
Further: to align 3 times through thermal straightening machine after steel plate rolls, each is respectively 624 DEG C, 589 DEG C and 565 DEG C all over corresponding temperature during aligning.
Further: in continuously cast bloom heat-processed, slab tapping temperature is 1180 DEG C, 365 minutes heat-up times; First stage start rolling temperature is 1170 DEG C, finishing temperature 1040 DEG C, and roll speed is 1.5m/s, and the steel plate thickness that the first stage rolls is 36mm, and during first stage high temperature extension rolling, the draft of single pass is minimum is 14%, and the first stage is rolling 7 passages altogether; Subordinate phase open rolling thickness is 36mm, subordinate phase start rolling temperature is 960 DEG C, finishing temperature 818 DEG C, subordinate phase rolling 5 passages, the draft of single pass is respectively 15.2%, 23.2%, 23.3%, 21.2% and 15.4%, the roll speed of corresponding passage is respectively 3.6m/s, 3.8m/s, 4.1m/s, 4.6m/s and 4.9m/s, and the steel plate thickness that subordinate phase rolls is 12mm.
Further: to align 3 times through thermal straightening machine after steel plate rolls, each is respectively 658 DEG C, 635 DEG C and 616 DEG C all over corresponding temperature during aligning.
Further: in continuously cast bloom heat-processed, slab tapping temperature is 1215 DEG C, 450 minutes heat-up times; First stage start rolling temperature is 1206 DEG C, finishing temperature 1032 DEG C, and roll speed is 1.8m/s, the steel plate thickness 33mm that the first stage rolls, and during first stage high temperature extension rolling, the draft of single pass is minimum is 14%, and the first stage is rolling 7 passages altogether; Subordinate phase open rolling thickness is 33mm, subordinate phase start rolling temperature is 970 DEG C, finishing temperature 800 DEG C, subordinate phase rolling 5 passages, the draft of single pass is respectively 19.4%, 24.1%, 22.7%, 18.8%, 13%, the roll speed of corresponding passage is respectively 3.4m/s, 3.7m/s, 4.2m/s, 4.4m/s and 4.6m/s, and the steel plate thickness that subordinate phase rolls is 11mm.
Further: to align 3 times through thermal straightening machine after steel plate rolls, each is respectively 638 DEG C, 613 DEG C and 584 DEG C all over corresponding temperature during aligning.
Compared with prior art, technique effect of the present invention comprises:
The present invention, without thermal treatment, does not increase any cost, only need be optimized production technique, just can increase substantially the toughness of steel plate, produce the steel plate of excellent property.Produced 50,000 tons of 10-12mm steel plates that are thick, yield strength 345MPa level with 1 year to calculate, this application, makes ballistic work qualification rate bring up to 99.95% by former 70%.Often save one ton of steel plate with thermal treatment and increase cost 200 yuan calculating.299.5 ten thousand yuan within 1 year, can be saved.
Specifically comprise:
(1) the present invention effectively can improve the toughness of yield strength 345MPa level 10 ~ 12mm Plate Steel, and the ballistic work qualification rate of yield strength 345MPa level Plate Steel 10 ~ 12mm is increased to 99.95% by former 70%.
(2) adopt the present invention to improve the toughness of yield strength 345MPa level 10 ~ 12mm Plate Steel, steel plate need not be heat-treated, and the manufacturing cost of material is lower, with short production cycle, and management difficulty reduces.
(3) process window of steel plate is relatively loose, can on generous printed line stably manufactured.
Embodiment
The present invention is applicable to the production of yield strength 345MPa level 10 ~ 12mm Plate Steel.10 ~ 12mm Plate Steel adopts 250mm heavy slab to produce, and by controlling the finishing temperature of tapping temperature, heat-up time, first stage well, and the parameter such as subordinate phase open rolling thickness, start rolling temperature, finishing temperature just can produce the good steel plate of toughness.The steel plate ballistic work of-40 DEG C all meets standard-required, and has larger affluence amount, and steel plate need not be heat-treated, and low cost of manufacture, with short production cycle, process window are loose, can on generous printed line stably manufactured.
Improve the production method of yield strength 345MPa level 10 ~ 12mm Plate Steel toughness, step comprises:
Step 1: heating of plate blank;
The present invention is applicable to the production of yield strength 345MPa level 10 ~ 12mm Plate Steel, adopts 250mm heavy slab to produce.Slab tapping temperature 1180 ~ 1220 DEG C, 270 ~ 450 minutes heat-up times.
The production of yield strength 345MPa level 10 ~ 12mm Plate Steel adopts 250mm slab to produce, and mainly ensures larger compression ratio, abundant fining austenite grains during to ensure rolling, and eliminates the casting flaw of slab inside.Slab tapping temperature mainly considers what Surface Quality of Steel Billet and Rolling Production direct motion were formulated, tapping temperature is too low, the initial oxidation iron sheet that steel slab surface is formed in heat-processed is difficult to remove, be pressed into surface of steel plate during rolling and form pit, and due to finished steel plate thin, rolling pass number is many, and temperature drop is comparatively large, likely cannot rolling is complete on request.
Step 2: the slab after heating is rolled;
Steel plate is rolling in two stages, first stage rolling technology: start rolling temperature is 1170 ~ 1210, roll speed is 1.5 ~ 2m/s, finishing temperature >=1010 DEG C, the open rolling thickness of first stage is slab thickness 250mm, steel plate thickness when first stage, rolling completed is the open rolling thickness of subordinate phase steel plate, when first stage high temperature extends rolling, requires single pass draft >=12% of steel plate.
Subordinate phase rolling technology: subordinate phase open rolling thickness is 3 times of finished steel plate thickness, thickness when subordinate phase rolling completes is the finished product target thickness of steel plate, finish rolling rolling 5 passage, subordinate phase start rolling temperature is 960 ~ 980 DEG C, finishing temperature is 800 ~ 830 DEG C, draft >=15% having two passages at least is required during subordinate phase rolling, the roll speed of first is 3 ~ 4m/s, roll speed 3.3 ~ the 4.3m/s of second, roll speed 3.5 ~ the 4.5m/s in the 3rd road, roll speed 3.8 ~ the 4.7m/s in the 4th road, roll speed 4 ~ the 5m/s in the 5th road.
First stage adopts lower roll speed, mainly in order to obtain larger single pass draught, roll speed is less, then rolling load is less, rolling torque is less, thus when Motor Capability is certain, and less roll speed, larger single pass draught will be obtained, be conducive to the refinement of austenite crystal, evenly and eliminate the casting flaw of slab inside.And lower roll speed, can ensure the temperature of the complete temperature of next passes lower than upper a time, the austenite crystal that the lower a time austenite recrystallization crystal grain rolled is rolled than upper a time is little, reaches abundant fining austenite grains object.
Subordinate phase adopts thicker secondary open rolling thickness, lower secondary open rolling and finishing temperature, time mainly in order to subordinate phase rolling, can ensure larger subordinate phase draught, reaches uniform formation and abundant refinement or broken austenitic object.Tiny, uniform ferrite+pearlitic structure will be obtained after such austenite phase transformation, obtain the steel plate that toughness is good.
In actual production, the subordinate phase open rolling thickness of steel plate is fixed according to actual finished steel plate thickness, and because finished steel plate thickness is different, the open rolling thickness of subordinate phase is also different.
Step 3: the steel plate rolled is aligned through thermal straightening machine, finished steel plate yield strength 345MPa level, thickness 10 ~ 12mm.
Roll steel plate and align 3 times through thermal straightening machine, straightening temperature is more than or equal to 400 DEG C.Roll steel plate when thermal straightening machine is aligned, need not heat, because the temperature that steel plate rolls is also higher, meet the requirement of thermal straightening machine to temperature.Some flatness defects such as shape wave, warpage produced in the operation of rolling can be eliminated by aligning, ensure that the planeness of steel plate meets service requirements.
Below in conjunction with embodiment, technical solution of the present invention is further described.
Embodiment 1
Slab thickness is that 250mm is thick, and finished steel plate thickness is 10mm, slab tapping temperature is 1220 DEG C, 270 minutes heat-up times.First stage start rolling temperature is 1210 DEG C, finishing temperature 1010 DEG C, roll speed is 2m/s, and the open rolling thickness of the steel plate thickness that the first stage rolls and subordinate phase is 30mm, during first stage high temperature extension rolling, the draft of single pass is minimum is 12%, and the first stage is rolling 8 passages altogether; Subordinate phase open rolling thickness is 30mm, subordinate phase rolling 5 passages, subordinate phase start rolling temperature is 980 DEG C, finishing temperature 830 DEG C, the steel plate thickness that subordinate phase rolls is 10mm, the draft of single pass is respectively 16.7%, 24%, 21.1%, 19.3%, 16.7%, and the roll speed of corresponding passage is respectively 3.5m/s, 3.8m/s, 4.2m/s, 4.5m/s, 4.8m/s.
Align 3 times through thermal straightening machine after steel plate rolls, each is respectively 624 DEG C, 589 DEG C, 565 DEG C all over corresponding temperature during aligning.
Good by the steel plate ballistic work of this explained hereafter ,-40 DEG C of ballistic works reach 128J, meet concerned countries standard-required, and have larger affluence amount.
Embodiment 2
Slab thickness is that 250mm is thick, and finished steel plate thickness is 12mm, slab tapping temperature is 1180 DEG C.365 minutes heat-up times, first stage start rolling temperature is 1170 DEG C, finishing temperature 1040 DEG C, and roll speed is 1.5m/s; The open rolling thickness of the steel plate thickness that the first stage rolls and subordinate phase is 36mm, and during first stage high temperature extension rolling, the draft of single pass is minimum is 14%, and the first stage is rolling 7 passages altogether; Subordinate phase open rolling thickness is 36mm, subordinate phase rolling 5 passages, subordinate phase start rolling temperature is 960 DEG C, finishing temperature 818 DEG C, the steel plate thickness that subordinate phase rolls is 12mm, the draft of single pass is respectively 15.2%, 23.2%, 23.3%, 21.2%, 15.4%, and the roll speed of corresponding passage is respectively 3.6m/s, 3.8m/s, 4.1m/s, 4.6m/s, 4.9m/s.
Align 3 times through thermal straightening machine after steel plate rolls, each is respectively 658 DEG C, 635 DEG C, 616 DEG C all over corresponding temperature during aligning.
Good by the steel plate ballistic work of this explained hereafter ,-40 DEG C of ballistic works reach 256J, meet concerned countries standard-required, and have larger affluence amount.
Embodiment 3
Slab thickness is that 250mm is thick, and finished steel plate thickness is 11mm, slab tapping temperature is 1215 DEG C.450 minutes heat-up times, first stage start rolling temperature is 1206 DEG C, finishing temperature 1032 DEG C, and roll speed is 1.8m/s; The open rolling thickness of the steel plate thickness that the first stage rolls and subordinate phase is 33mm, during first stage high temperature extension rolling, the draft of single pass is minimum is 14%, and the first stage is rolling 7 passages (note: please remark additionally first stage several passage) altogether; Subordinate phase open rolling thickness is 33mm, subordinate phase rolling 5 passages, subordinate phase start rolling temperature is 970 DEG C, finishing temperature 800 DEG C, the steel plate thickness that subordinate phase rolls is 11mm, the draft of single pass is respectively 19.4%, 24.1%, 22.7%, 18.8%, 13%, and the roll speed of corresponding passage is respectively 3.4m/s, 3.7m/s, 4.2m/s, 4.4m/s, 4.6m/s.
3 times are aligned through thermal straightening machine after steel plate rolls, each is respectively 638 DEG C, 613 DEG C, 584 DEG C all over corresponding temperature during aligning.
Good by the steel plate ballistic work of this explained hereafter ,-40 DEG C of ballistic works reach 189J, meet concerned countries standard-required, and have larger affluence amount.
Claims (7)
1. improve a production method for yield strength 345MPa level 10 ~ 12mm Plate Steel toughness, step comprises:
Heating of plate blank; The thickness of described slab adopts 250mm, and described slab tapping temperature is 1180 ~ 1220 DEG C, and heat-up time is 270 ~ 450 minutes;
Slab after heating is rolled; Rolling in two stages, in first stage rolling technology, start rolling temperature is 1170 ~ 1210 DEG C, roll speed is 1.5 ~ 2m/s, finishing temperature >=1010 DEG C, open rolling thickness is slab thickness 250mm, and the steel plate thickness when first stage, rolling completed is the open rolling thickness of subordinate phase steel plate, requires single pass draft >=12% of steel plate when first stage high temperature extends rolling; In subordinate phase rolling technology, open rolling thickness is 3 times of finished steel plate thickness, thickness when rolling completes is finished steel plate thickness, finish rolling rolling 5 passage, subordinate phase start rolling temperature is 960 ~ 980 DEG C, finishing temperature is 800 ~ 830 DEG C, draft >=15% having two passages at least is required during subordinate phase rolling, the roll speed of first is 3 ~ 4m/s, the roll speed of second is 3.3 ~ 4.3m/s, the roll speed in the 3rd road is 3.5 ~ 4.5m/s, and the roll speed in the 4th road is 3.8 ~ 4.7m/s, and the roll speed in the 5th road is 4 ~ 5m/s;
The steel plate that subordinate phase rolls is aligned through thermal straightening machine, finished steel plate yield strength 345MPa level, thickness 10 ~ 12mm; Roll steel plate and align 3 times through thermal straightening machine, straightening temperature is more than or equal to 400 DEG C.
2. improve the production method of yield strength 345MPa level 10 ~ 12mm Plate Steel toughness as claimed in claim 1, it is characterized in that: in continuously cast bloom heat-processed, slab tapping temperature is 1220 DEG C, 270 minutes heat-up times; First stage start rolling temperature is 1210 DEG C, finishing temperature 1010 DEG C, and roll speed is 2m/s, and the steel plate thickness that the first stage rolls is 30mm, and during first stage high temperature extension rolling, the draft of single pass is minimum is 12%, and the first stage is rolling 8 passages altogether; The open rolling thickness of subordinate phase steel plate is 30mm, subordinate phase rolling 5 passages, subordinate phase start rolling temperature is 980 DEG C, finishing temperature 830 DEG C, subordinate phase rolling 5 passages, the draft of single pass is respectively 16.7%, 24%, 21.1%, 19.3% and 16.7%, and the roll speed of corresponding passage is respectively 3.5m/s, 3.8m/s, 4.2m/s, 4.5m/s and 4.8m/s, and the steel plate thickness that subordinate phase rolls is 10mm.
3. improve the production method of yield strength 345MPa level 10 ~ 12mm Plate Steel toughness as claimed in claim 2, it is characterized in that: align 3 times through thermal straightening machine after steel plate rolls, each is respectively 624 DEG C, 589 DEG C and 565 DEG C all over corresponding temperature during aligning.
4. improve the production method of yield strength 345MPa level 10 ~ 12mm Plate Steel toughness as claimed in claim 1, it is characterized in that: in continuously cast bloom heat-processed, slab tapping temperature is 1180 DEG C, 365 minutes heat-up times; First stage start rolling temperature is 1170 DEG C, finishing temperature 1040 DEG C, and roll speed is 1.5m/s, and the steel plate thickness that the first stage rolls is 36mm, and during first stage high temperature extension rolling, the draft of single pass is minimum is 14%, and the first stage is rolling 7 passages altogether; Subordinate phase open rolling thickness is 36mm, subordinate phase start rolling temperature is 960 DEG C, finishing temperature 818 DEG C, subordinate phase rolling 5 passages, the draft of single pass is respectively 15.2%, 23.2%, 23.3%, 21.2% and 15.4%, the roll speed of corresponding passage is respectively 3.6m/s, 3.8m/s, 4.1m/s, 4.6m/s and 4.9m/s, and the steel plate thickness that subordinate phase rolls is 12mm.
5. improve the production method of yield strength 345MPa level 10 ~ 12mm Plate Steel toughness as claimed in claim 4, it is characterized in that: align 3 times through thermal straightening machine after steel plate rolls, each is respectively 658 DEG C, 635 DEG C and 616 DEG C all over corresponding temperature during aligning.
6. improve the production method of yield strength 345MPa level 10 ~ 12mm Plate Steel toughness as claimed in claim 1, it is characterized in that: in continuously cast bloom heat-processed, slab tapping temperature is 1215 DEG C, 450 minutes heat-up times; First stage start rolling temperature is 1206 DEG C, finishing temperature 1032 DEG C, and roll speed is 1.8m/s, the steel plate thickness 33mm that the first stage rolls, and during first stage high temperature extension rolling, the draft of single pass is minimum is 14%, and the first stage is rolling 7 passages altogether; Subordinate phase open rolling thickness is 33mm, subordinate phase start rolling temperature is 970 DEG C, finishing temperature 800 DEG C, subordinate phase rolling 5 passages, the draft of single pass is respectively 19.4%, 24.1%, 22.7%, 18.8%, 13%, the roll speed of corresponding passage is respectively 3.4m/s, 3.7m/s, 4.2m/s, 4.4m/s and 4.6m/s, and the steel plate thickness that subordinate phase rolls is 11mm.
7. improve the production method of yield strength 345MPa level 10 ~ 12mm Plate Steel toughness as claimed in claim 6, it is characterized in that: align 3 times through thermal straightening machine after steel plate rolls, each is respectively 638 DEG C, 613 DEG C and 584 DEG C all over corresponding temperature during aligning.
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| CN107177776A (en) * | 2017-05-05 | 2017-09-19 | 内蒙古包钢钢联股份有限公司 | Low-cost high-toughness thin specification steel plate and its production method |
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