CN106834640A - A kind of manufacture method of low-alloy structural steel hot rolled steel plate - Google Patents
A kind of manufacture method of low-alloy structural steel hot rolled steel plate Download PDFInfo
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- CN106834640A CN106834640A CN201710130003.0A CN201710130003A CN106834640A CN 106834640 A CN106834640 A CN 106834640A CN 201710130003 A CN201710130003 A CN 201710130003A CN 106834640 A CN106834640 A CN 106834640A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention belongs to metal material processing and field shaping technique, more particularly to a kind of manufacture method of low-alloy structural steel hot rolled steel plate, (1) desulfurizing iron dephosphorization is comprised the following steps, LF is concise, be cast into steel billet；(2) heating steel billet；(3) roughing operation；(4) finishing rolling step；(5) section cooling operation；(6) batch；(7) finishing rolling step is flattened；(8) wind.The manufacture method of low-alloy structural steel hot rolled steel plate of the invention, the steel plate after finish rolling is batched flattens finish rolling again, without carrying out subsequent heat treatment, just can improve the intensity of hot rolled steel plate, while ensureing that hot rolled steel plate has preferable machinability.
Description
Technical field
The invention belongs to metal material processing and field shaping technique, more particularly to a kind of low-alloy structural steel hot rolled steel plate
Manufacture method.
Background technology
Industry manufacture field, the application of low-alloy structural steel is extremely wide, such as nigh-level synthesis, bridge, and vapour
Car, railway, tunnel, high intensity part of engineering machinery etc., compared with common carbon structural steels, intensity is higher, toughness is more preferable.
The domestic existing more research of industrial production and products application aspect to low-alloy structural steel, although some steel plates have higher
Yield strength and tensile strength, but generally need to be annealed after batching, heat treatment and the cold-rolling process such as normalizing, so as to reach
To required intensity and machinability, production cost is higher, and the manufacturing cycle is long, and efficiency is low, cumbersome, and at heat
Quality is difficult to ensure that during reason.
Document 1：CN104805357A be the invention such as Shoudu Iron and Steel Corp. Liu spring " a kind of low-alloy high-strength hot rolled steel plate and
Its manufacture method ", it contains C：0.15~0.22%, Si：0.25~0.65%, Mn：1.20~1.80%, P≤0.02%, S
≤ 0.010%, Alt：0.020~0.060%, Ti：0.020~0.060%, V：0.10~0.20%, remaining is Fe and can not
The impurity for avoiding, technical process is followed successively by carries out dephosphorization and desulfurization, smelting, concise, sheet billet continuous casting, heating of plate blank, hot continuous rolling, normalizing
Treatment, yield strength can stably reach 550MPa up to more than 420MPa, tensile strength.Need to be realized by follow-up normalized treatment
Crystal grain thinning, carbon are evenly distributed etc. and steel plate is met certain intensity, but the production cycle is long, and the quality during normalized treatment
It is difficult to ensure that.
Document 2：CN104060161A is the " a kind of of Pangang's leaf dawn fine jade invention
Hot continuous-milling steel plate and its production method ", it contains C：0.17%, Si：0.25, Mn：1.80, P：0.018, S：0.015%, Ti：
0.092, Fe：99.27, and inevitably impurity, technical process be followed successively by Continuous Casting Under obtain continuous casting billet, heating steel billet,
Roughing, finish rolling, cool down, batch, yield strength is 390MPa, and tensile strength can reach 525MPa, elongation percentage 30%.Though the method
So the technological operations such as subsequent heat treatment are not carried out, but can be seen that compared with document 1 by experimental data, the intensity of steel plate is simultaneously
Do not significantly improve, or even declined, and also do not refer to that the method may be such that the other performance of steel plate makes moderate progress.
Analyzed more than, the production method of hot rolled steel plate in the prior art, it is long to there is the production cycle, high cost, steel
The problems such as plate combination property is undesirable, therefore this area urgent need is a kind of strong without that just can improve hot rolled steel plate by subsequent heat treatment
The manufacture method of degree and the guarantee preferable machinability of hot rolled steel plate.
The content of the invention
It is an object of the invention to provide a kind of manufacture method of low-alloy structural steel hot rolled steel plate, it can improve hot rolling
Ensure that hot rolled steel plate has preferable machinability while armor plate strength.
In order to achieve the above object, the invention provides a kind of manufacture method of low-alloy structural steel hot rolled steel plate, including
Following steps：
(1) the concise stove LF of molten iron pretreatment desulfurizing dephosphorization, ladle is concise, slab direct casting is into steel billet；
(2) heating steel billet, steel billet loading heating furnace is heated, and wherein heating-up temperature is 1190~1230 DEG C,
Equal temperature time >=30min, tapping temperature is 1100~1200 DEG C；
(3) roughing operation, is rolled roughing mills are sent into after the steel billet for heating quickly is cooled down, rolling extreme trace
Temperature is 1000~1050 DEG C, and it is 19%~25% that rolling extreme trace pushes rate, and mill speed is controlled in more than 2.5m/s, is obtained
Roughing steel plate；
(4) finishing rolling step, quickly cools down send roughing steel plate into mm finishing mill unit and is rolled, and the inlet temperature of finish rolling is
850~900 DEG C, it is 8%~15% that finish rolling extreme trace pushes rate, and mill speed is in below 2.5m/s；Final rolling temperature 720~
750 DEG C, obtain finish rolling steel plate；
(5) section cooling operation, cooling velocity is 25~30 DEG C/s；
(6) batch, finish rolling steel plate is sent into the first coiling machine and is batched, oiler temperature control obtains heat at 480~560 DEG C
Continuous-milling steel plate is rolled up；
(7) finishing rolling step is flattened, flattening mm finishing mill unit finish rolling, rolling temperature is sent into after hot continuous-milling steel plate is wound off into flattening
It it is 400~460 DEG C, it is 7%~15% that extreme trace pushes rate, and tension force is 8~15MPa, obtains final finish rolling steel plate；
(8) wind, final finish rolling steel plate is sent into the second coiling machine and is batched, coiling temperature is 350~400 DEG C, gained steel
Band volume natural air cooling obtains low-alloy structural steel hot rolled steel plate volume to room temperature.
Further, low-alloy structural steel hot-rolled steel is to contain C in terms of quality percentage：0.15~0.22%, Si：0.25~
0.65%, Mn：1.20~1.80%, P≤0.015%, S≤0.003%, Alt：0.020~0.060%, Ti：0.020~
0.060%, V：0.10~0.20%, remaining is Fe and inevitable impurity.
Further, high pressure descaling operation is also included with before roughing operation after heating steel billet, high pressure descaling operation is with pressure
Come out of the stove steel billet positive and negative water jet descaling 10~20s of the water under high pressure of 15~20MPa of power to heating steel billet operation.
Further, through 1~2 passes, the steel plate of finishing rolling step is through 4~7 passes, exhibition for the steel billet of roughing operation
The steel plate of flat finishing rolling step is through 1~2 passes.
Further, in heating steel billet operation steel billet more than stove total time 160min, 50~60min of soaking, on steel billet,
The lower surface temperature difference≤10 DEG C.
Further, also include for the roughing steel plate obtained by roughing operation passing through Coil Box between step (3) and step (4)
Batch, carry out samming and operated with insulation, it is ensured that the head and the tail temperature difference of the roughing steel plate of entrance mm finishing mill unit is within 25 DEG C.
Further, the roughing steel plate that Coil Box is batched after launching also includes secondary high-pressure de-scaling work before carrying out finishing rolling step
Sequence, removes roughing surface of steel plate secondary oxidation iron sheet, and secondary high-pressure de-scaling operation is the water under high pressure with 15~20MPa of pressure to steel
10~20s of plate positive and negative water jet descalings.
Further, the steel billet or steel plate of roughing operation and finishing rolling step are rolled using steekle mill, flatten finishing rolling step
Steel plate using Multi-stand continuous rolling mill roll；Or the steel billet or steel plate of roughing operation, finishing rolling step and flattening finishing rolling step
Rolled using Multi-stand continuous rolling mill.
Further, the steel plate of finishing rolling step and flattening finishing rolling step is rolled using Multi-stand continuous rolling mill, each adjacent
It is separately provided for adjusting the looper of steel plate tension force between frame.
Further, also include that straightener aligns operation, aligning with before flattening finishing rolling step after hot continuous-milling steel plate winds off
Machine roller number is more than or equal to 9.
A kind of manufacture method of low-alloy structural steel hot rolled steel plate of the invention, has the advantages that：
1st, finish rolling steel plate is flattened again after being batched through coiling machine, increases flattening finishing rolling step, to induce microalloy element to exist
Further separated out in ferrite, notable precipitation strength is produced, so as to improve the intensity of hot rolled steel plate.
2nd, the manufacture method of low-alloy structural steel hot rolled steel plate of the invention, by control related rolling technological parameter come
The tissue morphology of control austenite structure Changing Pattern and phase-change product, can produce with higher yield strength and tension
The hot rolled steel plate of intensity.
3rd, the steel billet of the manufacture method of low-alloy structural steel hot rolled steel plate of the invention by heating devices heat it is latter until
The overall process of steel plate finished product is temperature-fall period, middle without heating to steel plate, therefore has saved the energy, reduces life
Produce cost.
4th, the hot rolled steel plate of present invention production need not carry out the heat treatment in later stage just has intensity higher and preferably
Machinability, operates easy control, and hot rolled steel plate quality is good, and Plate Production cycle is short.
5th, simultaneously added with trace element, steel is ensured using the refined crystalline strengthening produced by micro- V, Ti and precipitation strength
The mechanical property of plate, mouldability and welding performance.
6th, the manufacture method of low-alloy structural steel hot rolled steel plate of the invention, work is respectively processed by strict control hot rolled steel plate
The technological parameter of sequence, the 400~460MPa of yield strength of the hot rolled steel plate produced, 650~720MPa of tensile strength extend
Rate：28~34%, yield tensile ratio≤0.70,75~83HRB of hardness, combination property is good.
Brief description of the drawings
Fig. 1 is the flow chart of the manufacture method of low-alloy structural steel hot rolled steel plate of the present invention；
Specific embodiment
Below in conjunction with the accompanying drawing in the present invention, clear, complete retouching is carried out to the technical scheme in the embodiment of the present invention
State, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the present invention
In embodiment, all other reality that those skilled in the art is obtained on the premise of creative work is not made
Example is applied, protection scope of the present invention is belonged to.
As shown in figure 1, a kind of manufacture method of low-alloy structural steel hot rolled steel plate of the invention, including：
Step S1：The concise stove LF of molten iron pretreatment desulfurizing dephosphorization, ladle is concise, slab direct casting is into steel billet.Molten iron enters
Row desulfurization dephosphorization is smelted, and reduces the content of the impurity elements such as P, S, makes the degree of purity of molten steel higher, and P can increase in general
The cold plasticity of steel plate, reduces the welding performance of steel plate, reduces plasticity, and S can make steel plate produce red brittleness, reduce the ductility of steel
And toughness, easily crack steel plate in the follow-up operation of rolling, it is therefore preferable that should ensure that S content≤0.0050% in steel billet, P
Content≤0.015%；To Si-Fe, Al-Fe, Mn-Fe, Ti-Fe, V-Fe alloy, and C powder is added in molten steel when LF is concise, adjust
Whole Si, Al, Mn, Ti, V element content, the refined crystalline strengthening and precipitation strength that are produced using microelement Ti, V ensure the power of steel plate
Performance is learned, while Ti can also improve the welding performance of steel plate；To, by feeding Ca-Fe lines, becoming to field trash in molten steel
Property treatment；The argon gas that single channel flow is 50~150L/min is blown into by the bottom blowing hole of ladle bottom, makes inclusion floating；Finally
By molten iron direct casting into 180mm~220mm steel billet.
Step S2：Heating steel billet, steel billet loading heating furnace is heated, and wherein heating-up temperature is 1190~1230
DEG C, equal temperature time >=30min, tapping temperature is 1100~1200 DEG C.Further, in heating steel billet operation steel billet when stove is total
Between more than 160min, 50~60min of soaking, upper and lower surface temperature difference≤10 DEG C of steel billet.Preferably, using walking beam furnace pair
Steel billet is heated, and the steel billet of heating is not limited by end surface shape and size, and computer heating control is flexibly, widely applicable.It is heated
Cheng Zhongying strictly control firing rate, heat time and heating-up temperature etc., heating steel billet it is noted that prevent the oxidation of steel, decarburization,
The generation of the defects such as overheat burning.
Step S3：Roughing operation, is rolled roughing mills are sent into after the steel billet for heating quickly is cooled down, rolling end
Passage temperature is 1000~1050 DEG C, and it is 19%~25% that rolling extreme trace pushes rate, and mill speed is controlled in more than 2.5m/s,
Obtain roughing steel plate.Steel billet come out of the stove after fast cooling, steel billet carries out the fast speed rolling of big volume under pressure in austenite recrystallization region,
Austenite crystal quickly can be crushed sufficiently on the whole thickness direction of steel billet, while the rolling of roughing operation again can be with
Growing up for original austenite grains is avoided, the precipitation of microalloy element carboritride is promoted in addition, non-recrystallization is increased
The crystal defects such as the crystal boundary of austenite, deformation band and dislocation twin, are that the refined crystalline strengthening of follow-up finishing rolling step is prepared.
Step S4：Finishing rolling step, quickly cools down send roughing steel plate into mm finishing mill unit and is rolled, the inlet temperature of finish rolling
It it is 850~900 DEG C, it is 8%~15% that finish rolling extreme trace pushes rate, and mill speed is in below 2.5m/s；Final rolling temperature 720
~750 DEG C, obtain finish rolling steel plate.Finishing rolling step is small volume under pressure increasing speed rolling, and the finish rolling stage is using two-phase section rolling even iron
Ferritic area rolls, deformation induced trans- formation, on the one hand can increase ferritic content crystal grain thinning, on the other hand improves supercooling difficult to understand
Family name's body concentration of carbon, increases dislocation and substructure density.
Step S5：Section cooling operation, cooling velocity is 25~30 DEG C/s.Due to the thermal deformation for rolling, ferrite can be
Separated out under higher temperature, Direct Air-Cooled ferrite crystal grain meeting fast growth, it is therefore necessary to control cooling velocity to reach rolling effect
Really, crystal grain refinement is realized；The precipitation strength and solution strengthening of microalloy are controlled, makes the carboritride of microalloy element more
Disperse；In addition, microalloy element mostly has intensity higher and the microalloy carbon obtained under normal Treatment technique for processing
Nitride particle is the little disc-shaped of the thick deviation in spherical or footpath, therefore the addition of microalloy element can significantly improve steel plate
Intensity, but influence to steel plate toughness is less, therefore can ensure that steel plate has good machinability.
Step S6：Batch, finish rolling steel plate is sent into the first coiling machine and is batched, oiler temperature control is obtained at 480~560 DEG C
Obtain hot continuous-milling steel plate volume.Should strictly control coiling temperature when batching, and then control the transformation pattern of pearlite, realize pearly-lustre group
Small and scattered, the cementite parts thinner, change in pearlite are broken.Preferably, the first coiling machine is three-roller type downcoiler, if
Put 3, it is ensured that the continuity of Plate Production, improve Plate Production efficiency；And three-roller type downcoiler is for slab and thin
Plate is suitable for, and is more suitable for produced on-site needs.
Step S7：Flattening finishing rolling step, flattening mm finishing mill unit finish rolling, rolling are sent into after hot continuous-milling steel plate is wound off into flattening
Temperature is 400~460 DEG C, and it is 7%~15% that extreme trace pushes rate, and tension force is 8~15MPa, obtains final finish rolling steel plate.To essence
Roll the steel plate batched after operation and flatten finish rolling again, the small flattening finish rolling for pushing rate of low temperature can induce microalloy element in iron element
Further separated out in body, distribution is more uniform, notable precipitation strength is produced, so as to significantly improve the intensity of hot rolled steel plate；Separately
Outward, flattening finish rolling can also control the pattern of ferrite and pearlite, it is to avoid ferritic too to grow up.
Step S8：Winding, sends final finish rolling steel plate into the second coiling machine and batches, and coiling temperature is 350~400 DEG C, institute
Steel coil strip natural air cooling is obtained to room temperature, low-alloy structural steel hot rolled steel plate volume is obtained.Batch at such a temperature, ferrite crystal grain is obtained
To refinement, the increasing number of acicular ferrite, content of pearlite in alloy will increase, and will further improve the intensity of steel, but in order to ensure
The toughness of steel plate, reduces yield tensile ratio, should be wound rapidly after flattening finishing rolling step, ensures that steel plate is rolled up at slightly higher temperature as far as possible
Take.
The manufacture method of low-alloy structural steel hot rolled steel plate of the invention, by controlling the heating-up temperature of steel billet, steel plate
Coiling temperature of rolling temperature and deformation system, the cooling velocity of steel plate and steel plate etc., fining austenite grains are phase transformation iron
Ferritic forming core provides more, more dispersed nucleation site, controls the tissue morphology of phase-change product, obtains tiny scattered ferrite
And pearlite, the intensity of hot rolled steel plate is improved, while improving the toughness of hot rolled steel plate, produce high intensity, the heat of high tenacity
Rolled steel plate.Also, the manufacture method of low-alloy structural steel hot rolled steel plate of the invention is with short production cycle, energy-saving, is produced into
This is low.
Further, also include rolling up the roughing steel plate obtained by roughing operation by Coil Box between step S3 and step S4
Take, carry out samming and operated with insulation, it is ensured that the head and the tail temperature difference of the roughing steel plate of entrance mm finishing mill unit is within 25 DEG C.Coil Box
Isothermal holding can be significantly shorter the head and the tail temperature difference of steel plate, it is ensured that hot-rolled steel plate processing quality, at the same Coil Box also act as it is right
Production line steel plate buffering linking, it is to avoid the generation of piling of steel phenomenon, the outside of Coil Box is provided with stay-warm case, with improve insulation and
Even temperature effect.
Further, high pressure descaling operation is also included with before roughing operation after heating steel billet, high pressure descaling operation is with pressure
Come out of the stove steel billet positive and negative water jet descaling 10~20s of the water under high pressure of 15~20MPa of power to heating steel billet operation.In operating process
De-scaling water and pressure should strictly be controlled, it is ensured that iron oxide on surface of billet steel skin is completely removed, it is to avoid during billet rolling
Iron scale is pressed into surface of steel plate, while abrasion of the iron scale to rolling equipment roll can also be avoided, extension rolling sets
Standby service life, while ensureing plate quality.
Preferably, the roughing steel plate that Coil Box is batched after launching also includes secondary high-pressure de-scaling work before carrying out finishing rolling step
Sequence, removes roughing surface of steel plate secondary oxidation iron sheet, and secondary high-pressure de-scaling operation is the water under high pressure with 15~20MPa of pressure to steel
10~20s of plate positive and negative water jet descalings.
Further, the steel billet or steel plate of roughing operation and finishing rolling step are rolled using steekle mill, flatten finishing rolling step
Steel plate using Multi-stand continuous rolling mill roll；Or the steel billet or steel plate of roughing operation, finishing rolling step and flattening finishing rolling step
Rolled using Multi-stand continuous rolling mill., through 1~2 passes, the steel plate of finishing rolling step is through 4~7 passages for the steel billet of roughing operation
Rolling, flattens the steel plate of finishing rolling step through 1~2 passes.
Preferably, the steel plate of finishing rolling step and flattening finishing rolling step is rolled using Multi-stand continuous rolling mill, each adjacent machine
It is separately provided for adjusting the looper of steel plate tension force between frame.During due to steel plate rolling, for finishing rolling step
Mm finishing mill unit is constantly present dynamic velocity drop when stinging steel, and various interference are constantly present again in the stable rolling stage, it is impossible to
Remain that good speeds match relation between each frame, looper are formed during Biting Course is absorbed with its cushioning effect
Set amount, so as to realize finishing rolling step or flattening finishing rolling step constant small tension receiving coil or tension-free steel plate rolling.
Further, also include that straightener aligns operation, aligning with before flattening finishing rolling step after hot continuous-milling steel plate winds off
Machine roller number is more than or equal to 9.Steel plate due to plastic deformation inequality, is heated and inhomogeneous cooling in rolling, cooling and shear history
Deng, certain bending, shape wave etc. can be produced to be plastically deformed, or it is internal produce residual stress, therefore necessary use straightener
Aligning processing is carried out to steel plate, the shape of steel plate is corrected and is eliminated residual stress.
Low-alloy structural steel hot-rolled steel of the invention is to contain C in terms of quality percentage：0.15~0.22%, Si：0.25~
0.65%, Mn：1.20~1.80%, P≤0.015%, S≤0.003%, Alt：0.020~0.060%, Ti：0.020~
0.060%, V：0.10~0.20%, remaining is Fe and inevitable impurity.
The manufacture method of low-alloy structural steel hot rolled steel plate of the invention, by strict control each manufacturing procedure of hot rolled steel plate
Technological parameter, the 400~460MPa of yield strength of the hot rolled steel plate produced, 650~720MPa of tensile strength, elongation percentage：
28~34%, yield tensile ratio≤0.70,75~83HRB of hardness, combination property is good.
Embodiment 1：The chemical composition of low-alloy structural steel hot rolled steel plate contains C for quality percentage meter：0.15%, Si：
0.27%, Mn：1.21%, P：0.014%, S：0.003%, Alt：0.030%, Ti：0.03%, V：0.15%, remaining is Fe
And inevitable impurity.The cast thickness of slab is 200mm；Tapping temperature is 1140 DEG C after heating；Steel billet warp after coming out of the stove
18MPa water under high pressure positive and negative de-scalings 15s；Through 2 passage roughing, roughing extreme trace time temperature is 1038 DEG C, roughing to steel billet after de-scaling
Steel plate thickness is 53mm afterwards；Steel plate after roughing is batched through Coil Box, isothermal holding, and the head and the tail temperature difference is 19 DEG C；Coil Box is incubated
Steel plate after treatment carries out 5 passage finish rolling after launching secondary descaling steel, and entry temperature at finishing is 870 DEG C, and final rolling temperature is 730
DEG C, the steel plate thickness after finish rolling is 4mm；Steel plate after finish rolling is cooled to 650 DEG C with the speed of 26 DEG C/s, then control cooling speed
Degree, batches when steel plate is cooled to 540 DEG C；Steel plate flattening after batching carries out the flattening finish rolling of 2 passages, flattens the rolling temperature of finish rolling
It is 450 DEG C, 435 DEG C to spend, and it is 14%, 12.8% to push rate, and tension force is 8MPa, obtains final 3mm thickness finish rolling steel plate, is rolled up immediately
Take, coiling temperature is 396 DEG C.The mechanical property of steel plate is：Yield limit 420MPa, tensile strength 690MPa, elongation percentage 32%,
Yield tensile ratio is 0.61, and hardness is 78HRB.
Embodiment 2：The chemical composition of low-alloy structural steel hot rolled steel plate contains C for quality percentage meter：0.18%, Si：
0.4%, Mn：1.52%, P：0.013%, S：0.0025%, Alt：0.040%, Ti：0.035%, V：0.18%, remaining is Fe
And inevitable impurity.The cast thickness of slab is 200mm；Tapping temperature is 1170 DEG C after heating；Steel billet warp after coming out of the stove
18MPa water under high pressure positive and negative de-scalings 15s；Through 2 passage roughing, roughing extreme trace time temperature is 1040 DEG C, roughing to steel billet after de-scaling
Steel plate thickness is 56mm afterwards；Steel plate after roughing is batched through Coil Box, isothermal holding, and the head and the tail temperature difference is 22 DEG C；Coil Box is incubated
Steel plate after treatment carries out 5 passage finish rolling after launching secondary descaling steel, and entry temperature at finishing is 880 DEG C, and final rolling temperature is 740
DEG C, the steel plate thickness after finish rolling is 5mm；Steel plate after finish rolling is cooled to 650 DEG C with the speed of 28 DEG C/s, then control cooling speed
Degree, batches when steel plate is cooled to 550 DEG C；Steel plate flattening after batching carries out the flattening finish rolling of 2 passages, flattens the rolling temperature of finish rolling
It is 445 DEG C, 420 DEG C to spend, and it is 12%, 9.1% to push rate, and tension force is 10MPa, obtains final 4mm thickness finish rolling steel plate, is rolled up immediately
Take, coiling temperature is 390 DEG C.The mechanical property of steel plate is：Yield limit 440MPa, tensile strength 702MPa, elongation percentage 31%,
Yield tensile ratio is 0.63, and hardness is 79HRB.
Embodiment 3：The chemical composition of low-alloy structural steel hot rolled steel plate contains C for quality percentage meter：0.21%, Si：
0.35%, Mn：1.42%, P：0.013%, S：0.0028%, Alt：0.050%, Ti：0.050%, V：0.19%, remaining is
Fe and inevitable impurity.The cast thickness of slab is 200mm；Tapping temperature is 1150 DEG C after heating；Steel billet after coming out of the stove
Through 17MPa water under high pressure positive and negative de-scalings 15s；Through 2 passage roughing, roughing extreme trace time temperature is 1030 DEG C to steel billet after de-scaling, slightly
Rear steel plate thickness is rolled for 58mm；Steel plate after roughing is batched through Coil Box, isothermal holding, and the head and the tail temperature difference is 20 DEG C；Coil Box is protected
Steel plate after temperature treatment carries out 6 passage finish rolling after launching secondary descaling steel, and entry temperature at finishing is 870 DEG C, and final rolling temperature is
735 DEG C, the steel plate thickness after finish rolling is 6mm；Steel plate after finish rolling is cooled to 650 DEG C with the speed of 28 DEG C/s, then controls cold
But speed, batches when steel plate is cooled to 530 DEG C；Steel plate flattening after batching carries out the flattening finish rolling of 2 passages, flattens rolling for finish rolling
Temperature processed is 450 DEG C, 430 DEG C, and it is 10%, 7.4% to push rate, and tension force is 9MPa, obtains final 5mm thickness finish rolling steel plate, immediately
Batch, coiling temperature is 395 DEG C.The mechanical property of steel plate is：Yield limit 455MPa, tensile strength 715MPa, elongation percentage
29%, yield tensile ratio is 0.64, and hardness is 82HRB.
The present invention is further described by specific embodiment above, here specific description, it is right to should not be construed as
The restriction of the spirit and scope of the invention, one of ordinary skilled in the art does to above-described embodiment after reading this specification
The various modifications for going out, belong to the scope that the present invention is protected.
Claims (10)
1. a kind of manufacture method of low-alloy structural steel hot rolled steel plate, it is characterised in that comprise the following steps：
(1) the concise stove LF of molten iron pretreatment desulfurizing dephosphorization, ladle is concise, slab direct casting is into steel billet；
(2) heating steel billet, steel billet loading heating furnace is heated, and wherein heating-up temperature is 1190~1230 DEG C, samming
Time >=30min, tapping temperature is 1100~1200 DEG C；
(3) roughing operation, is rolled roughing mills are sent into after the steel billet for heating quickly is cooled down, rolling extreme trace time temperature
It it is 1000~1050 DEG C, it is 19%~25% that rolling extreme trace pushes rate, and mill speed is controlled in more than 2.5m/s, obtains roughing
Steel plate；
(4) finishing rolling step, quickly cools down send roughing steel plate into mm finishing mill unit and is rolled, the inlet temperature of finish rolling for 850~
900 DEG C, it is 8%~15% that finish rolling extreme trace pushes rate, and mill speed is in below 2.5m/s；Final rolling temperature 720~750
DEG C, obtain finish rolling steel plate；
(5) section cooling operation, cooling velocity is 25~30 DEG C/s；
(6) batch, finish rolling steel plate is sent into the first coiling machine and is batched, oiler temperature control obtains hot continuous rolling at 480~560 DEG C
Roll of steel plate；
(7) finishing rolling step is flattened, flattening mm finishing mill unit finish rolling is sent into after hot continuous-milling steel plate is wound off into flattening, rolling temperature is
400~460 DEG C, it is 7%~15% that extreme trace pushes rate, and tension force is 8~15MPa, obtains final finish rolling steel plate；
(8) wind, final finish rolling steel plate is sent into the second coiling machine and is batched, coiling temperature is 350~400 DEG C, gained steel coil strip
Natural air cooling obtains low-alloy structural steel hot rolled steel plate volume to room temperature.
2. the manufacture method of low-alloy structural steel hot rolled steel plate according to claim 1, it is characterised in that the low-alloy
Structural steel hot-rolled steel is to contain C in terms of quality percentage：0.15~0.22%, Si：0.25~0.65%, Mn：1.20~1.80%,
P≤0.015%, S≤0.003%, Alt：0.020~0.060%, Ti：0.020~0.060%, V：0.10~0.20%, its
It is remaining for Fe and inevitable impurity.
3. the manufacture method of low-alloy structural steel hot rolled steel plate according to claim 1, it is characterised in that the steel billet adds
Also include high pressure descaling operation with before roughing operation after heat, the high pressure descaling operation is with the water under high pressure of 15~20MPa of pressure
To the 10~20s of steel billet positive and negative water jet descalings that comes out of the stove of heating steel billet operation.
4. the manufacture method of low-alloy structural steel hot rolled steel plate according to claim 1, it is characterised in that the roughing work
, through 1~2 passes, the steel plate of the finishing rolling step is through 4~7 passes, the steel of the flattening finishing rolling step for the steel billet of sequence
Plate is through 1~2 passes.
5. the manufacture method of low-alloy structural steel hot rolled steel plate according to claim 1, it is characterised in that the steel billet adds
Steel billet is more than stove total time 160min in thermal technology's sequence, 50~60min of soaking, upper and lower surface temperature difference≤10 DEG C of steel billet.
6. the manufacture method of low-alloy structural steel hot rolled steel plate according to claim 1, it is characterised in that step (3) with
Also include batching the roughing steel plate obtained by roughing operation by Coil Box between step (4), carry out samming and operated with insulation, protect
Card enters the head and the tail temperature difference of the roughing steel plate of mm finishing mill unit within 25 DEG C.
7. the manufacture method of low-alloy structural steel hot rolled steel plate according to claim 6, it is characterised in that Coil Box is batched
Roughing steel plate after expansion also includes secondary high-pressure de-scaling operation before carrying out finishing rolling step, removes roughing surface of steel plate secondary oxidation
Iron sheet, the secondary high-pressure de-scaling operation be with the water under high pressure of 15~20MPa of pressure to steel plate positive and negative water jet descaling 10~
20s。
8. the manufacture method of low-alloy structural steel hot rolled steel plate according to claim 1, it is characterised in that the roughing work
The steel billet or steel plate of sequence and finishing rolling step are rolled using steekle mill, and the steel plate of the flattening finishing rolling step uses multi-frame tandem rolling
Machine is rolled；Or the steel billet or steel plate of the roughing operation, finishing rolling step and the flattening finishing rolling step use multi-frame
Tandem mill is rolled.
9. the manufacture method of low-alloy structural steel hot rolled steel plate according to claim 1, it is characterised in that the finish rolling work
The steel plate of sequence and the flattening finishing rolling step is rolled using Multi-stand continuous rolling mill, is respectively provided between each adjacent rack useful
In the looper of regulation steel plate tension force.
10. the manufacture method of low-alloy structural steel hot rolled steel plate according to claim 1, it is characterised in that the heat is even
Rolled steel plate wind off after with flattening finishing rolling step before also include straightener align operation, the straightener roller number be more than or equal to 9.
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| CN108642387A (en) * | 2018-05-24 | 2018-10-12 | 山东钢铁集团日照有限公司 | A kind of the hot-rolled transformation induction plasticity steel and its production method of steel multistage |
| CN111266406A (en) * | 2020-03-02 | 2020-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of ultrathin hot continuous rolling steel strip |
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Application publication date: 20170613 |