CN108642387A - A kind of the hot-rolled transformation induction plasticity steel and its production method of steel multistage - Google Patents
A kind of the hot-rolled transformation induction plasticity steel and its production method of steel multistage Download PDFInfo
- Publication number
- CN108642387A CN108642387A CN201810509260.XA CN201810509260A CN108642387A CN 108642387 A CN108642387 A CN 108642387A CN 201810509260 A CN201810509260 A CN 201810509260A CN 108642387 A CN108642387 A CN 108642387A
- Authority
- CN
- China
- Prior art keywords
- steel
- rolled
- temperature
- hot
- roughing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- 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
- 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
- C21D8/0236—Cold rolling
-
- 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
- C21D8/0242—Flattening; Dressing; Flexing
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Abstract
The present invention relates to a kind of hot-rolled transformations of steel multistage to induce plasticity steel, and the chemical composition of steel billet includes C by weight percentage：0.18~0.23%, Si≤0.20%, Mn：1.50~2.00%, V：0.16~0.20%, Alt：0.020~0.060%, N：0.020~0.040%, and P≤0.020% is limited, S≤0.005%, surplus is Fe and other inevitable impurity.The present invention and its production method fully consider organization of production feature of the iron and steel enterprise for small lot hot-rolled transformation induction plasticity steel, using low Si composition designs, and effectively apply the precipitation enhancement of vanadium micro-alloying, by rational composition design and efficiently control each process segment process parameter, realization uses a kind of component system that can produce thickness specification as 3.0 5.0mm, the good 780MPa of surface quality, 980MPa and the other transformation induced plasticity steel product of tri- kinds of tensile strength grades of 1100MPa, not only it is conducive to iron and steel enterprise rapid digestion steel billet inventory, and it disclosure satisfy that the more parts of automobile industry, the specific demand of more performances.
Description
Technical field
The present invention relates to metallurgical material technical fields, and in particular to a kind of hot-rolled transformation induction plasticity steel of steel multistage and
Its production method.
Background technology
In recent years, the environmental requirement that automobile industry faces is increasingly harsh, and orthodox car is regarded as the main dirt of urban atmosphere
One of dye source, improvement vehicle exhaust is very urgent, and future automobile technology will be with safety, energy-saving and environmental protection, intelligence for developing direction.
Transformation induced plasticity steel in advanced high-strength steel has high strong plasticity matching and has attracted much attention, and is mainly used to make the gear of automobile
Plate, car door fender rod, bumper, vehicle chassis component, rim for automobile wheel and car door impact beam etc..In Japan, transformation induced plasticity steel is
It is used to make about 80 kinds of parts on concept chassis, compared with conventional steel plates, the pts wt manufactured with this steel plate subtracts
Light about 12%, per trolley weight saving about 14kg, economic benefit is apparent.
Each automobile main frame maker is less to the size of order of same levels transformation induced plasticity steel, about 20~60 tons every time, and
Domestic and international many iron and steel enterprises, tissue 1 stove high-strength steel of production is 210 tons, goes out strand about 8~10, can go out product volume 8~10
Volume is often rolled up and weighs about 20~25 tons.As it can be seen that fully considering production group of the iron and steel enterprise for small lot hot-rolled transformation induction plasticity steel
Feature is knitted, by rational composition design and efficiently controls each process segment process parameter, realizing can using a kind of component system
The transformation induced plasticity steel product of different stage is produced, is not only conducive to iron and steel enterprise rapid digestion steel billet inventory, but also can expire
The specific demand of sufficient automobile industry more parts, more performances, is those skilled in the art's technical problem urgently to be resolved hurrily.
In the prior art, publication number CN 106756512A describe a kind of steel multistage hot rolling complex phase high strength steel plate and
Its production method compares with the present invention, in addition to valuable microalloy elements such as 0.4~1.0%Cr of addition, 0.10~0.3%Mo
Except, Si contents reach 0.50~1.00%, and surface quality is compared to more of the invention poor；In addition annealing operation is also added, from
And obtain the complex phase high strength steel plate of 800MPa, 900MPa, 1000MPa, 1100MPa, wherein the elongation percentage of 800MPa ranks >=
14.5%；Elongation percentage >=13% of 1000MPa ranks；Elongation percentage >=12% of 1100MPa ranks.And 780MPa ranks of the present invention
Elongation percentage >=24.0%；Elongation percentage >=17.0% of 1000MPa ranks；Elongation percentage >=15.0% of 1100MPa ranks.
Remaining existing disclosed technology is produced just for a kind of transformation induced plasticity steel of particular intensity level
Method, processing method or manufacturing method illustrate.
Invention content
To overcome the deficiency, the purpose of the present invention is to provide a kind of hot-rolled transformation of a steel multistage induction plasticity steel and
Its production method by rational composition design and efficiently controls each process segment process using a kind of rational component system
Parameter produces the transformation induced plasticity steel product of different stage.
The technical solution adopted by the present invention to solve the technical problems is：A kind of hot-rolled transformation induction plasticity of steel multistage
The chemical composition of steel, steel billet includes C by weight percentage：0.18~0.23%, Si≤0.20%, Mn：1.50~2.00%, V：
0.16~0.20%, Alt：0.020~0.060%, N：0.020~0.040%, and P≤0.020% is limited, S≤0.005%,
Surplus is Fe and other inevitable impurity.
A kind of production method of the hot-rolled transformation induction plasticity steel of steel multistage is：The steel billet is added using steel billet successively
Thermal process, hot-rolled process, cooling process, coiling process, prepare transformation induced plasticity steel product thickness specification be 3.0~
5.0mm covers tri- kinds of tensile strength ranks of 780MPa, 980MPa and 1100MPa.Product meets and is better than EN10338 and GB/
T20564.6 standards.
Specifically, the steel billet thickness is 230mm.
Specifically, in the hot-rolled process, when hot-rolled finished product thickness is 3.0mm, it is 40mm that roughing, which exports base thickness,；When
Hot-rolled finished product thickness is 4.0mm, and it is 45mm that roughing, which exports base thickness,；When hot-rolled finished product thickness is 5.0mm, roughing exports base
Thickness is 50mm.
Specifically, in the production method of the other transformation induced plasticity steel of 780MPa tensile strength grades each process section work
Skill parameter is：
(1) heating process：By heating steel billet, setting soaking zone temperature is 1220~1260 DEG C, and soaking time is no more than
30min；
(2) hot-rolled process：Roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two roughing setting up mould
Type calculates；Roughing outlet temperature is 1090~1120 DEG C；910~930 DEG C of finish rolling finishing temperature；
(3) cooling process：It is taken after finish rolling and rolls rear leading portion and be quickly cooled down technique, with the fast quickly cooling of the cooling rate of >=40 DEG C/s
But to 690~710 DEG C；Then air-cooled to wait for temperature to 660~680 DEG C；Finally 400~420 DEG C are cooled to the cooling rate of >=30 DEG C/s；
(4) coiling process：The steel strip coiling of 400~420 DEG C of temperature be will be cooled into coil of strip, cooled to room temperature to obtain the final product
To the finished steel coils of the present invention.
Specifically, in the production method of the other transformation induced plasticity steel of 980MPa tensile strength grades each process section work
Skill parameter is：
(1) heating process：By heating steel billet, setting soaking zone temperature is 1170~1220 DEG C, and soaking time is no more than
30min；
(2) hot-rolled process：Roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two roughing setting up mould
Type calculates；Roughing outlet temperature is 1020~1050 DEG C；860~890 DEG C of finish rolling finishing temperature；
(3) cooling process：It is taken after finish rolling and rolls rear leading portion and be quickly cooled down technique, with the fast quickly cooling of the cooling rate of >=40 DEG C/s
But to 700~720 DEG C；Then air-cooled to wait for temperature to 670~690 DEG C；Finally 400~420 DEG C are cooled to the cooling rate of >=30 DEG C/s；
(4) coiling process：The steel strip coiling of 400~420 DEG C of temperature be will be cooled into coil of strip, cooled to room temperature to obtain the final product
To the finished steel coils of the present invention.
Specifically, each process section in the production method of the other transformation induced plasticity steel of 1100MPa tensile strength grades
Technological parameter is：
(1) heating process：By heating steel billet, setting soaking zone temperature is 1220~1240 DEG C, soaking time≤30min；
(2) hot-rolled process：Roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two roughing setting up mould
Type calculates；Roughing outlet temperature is 1030~1050 DEG C；840~860 DEG C of finish rolling finishing temperature, and ensure finishing stand extreme trace
Reduction ratio >=10%；It is taken after finish rolling and rolls rear leading portion and be quickly cooled down technique, be quickly cooled to the cooling rate of 20~40 DEG C/s
It 620~650 DEG C, is batched, coils of hot-rolled steel is made；
(3) acid rolls process：Then the above-mentioned coils of hot-rolled steel of pickling uses 65.0~69.0% drafts to remove oxide
Carry out cold rolling；
(4) continuous annealing process：Steel band after acid is rolled carries out continuous annealing, and 800~820 DEG C of soaking temperature, slow cooling section is terminated
720~730 DEG C of temperature, 400~420 DEG C of rapid cooling section end temp, 380~400 DEG C of overaging section temperature；
(5) smooth process：Smooth elongation control is 0.8 ± 0.1%.
The invention has the advantages that：The present invention and its production method fully consider that iron and steel enterprise is directed to small quantities of calorimetric
The organization of production feature for rolling transformation induced plasticity steel using low Si composition designs, and effectively applies the precipitation of vanadium micro-alloying
Invigoration effect by rational composition design and efficiently controls each process segment process parameter, realizes and uses a kind of component system
It is 3.0-5.0mm, surface quality tri- kinds of tensile strength grades of good 780MPa, 980MPa and 1100MPa that thickness specification, which can be produced,
Other transformation induced plasticity steel product is not only conducive to iron and steel enterprise rapid digestion steel billet inventory, but also disclosure satisfy that automobile industry
The specific demand of more parts, more performances.
Description of the drawings
Fig. 1 is that the hot-rolled transformation induced of 780MPa ranks that in the embodiment of the present invention 1 prepared by technique 1-III leads the micro- of plasticity steel
See organization chart；
Fig. 2 is that the hot-rolled transformation induced of 980MPa ranks that in the embodiment of the present invention 1 prepared by technique 1- V leads the micro- of plasticity steel
See organization chart；
Fig. 3 is that the hot-rolled transformation induced of 1100MPa ranks that in the embodiment of the present invention 1 prepared by technique 1- Ⅸ leads the micro- of plasticity steel
See organization chart；
Fig. 4 is the hot-rolled transformation induced plasticity steel of leading for the 1100MPa ranks that in the embodiment of the present invention 1 prepared by technique 1- Ⅸ saturating
The precipitation pattern that radio arrives under the microscope.
Specific implementation mode
The microstructure of sample and mechanical property performance test are carried out using following method in the embodiment of the present invention：
It is sampled along hot-rolled finished product coil of strip, metallographic specimen is ground, after polishing, is corroded, is being scanned using 4% nitric acid alcohol
Analysis on Microstructure is carried out under Electronic Speculum.
It is sampled along hot-rolled finished product coil of strip, it is opposite to measure retained austenite in sample with D/max2400 type X-ray diffractometers
When amount, the diffracted intensity of (220) γ and (200) peaks α are measured, using Formula Vγ=1.4Iγ/(Iα+1.4Iγ) acquire retained austenite
Relative quantity；Using Leica image analysis software measure and calculation ferrite volume fractions.
Sampling carries out tem analysis along hot-rolled finished product coil of strip, utilizes the carbonitride of H-800 type transmission electron microscope observing vanadium
It is precipitated.
It being sampled from hot-rolled finished product coil of strip and tensile sample is made by standard GB/T 228, effective gauge length is 80 × 20mm,
Mechanics Performance Testing is carried out on SANA universal testing machines.
In conjunction with the accompanying drawings, the present invention is further explained in detail.
Embodiment 1
The tapping ladle chemistry of steel billet is C by weight percentage in the present embodiment：0.21%, Si：0.16%, Mn：
1.50%, V：0.19%, Alt：0.046%, N：0.0315%, P：0.020%, S：0.005%, surplus is Fe and other can not
The impurity avoided, steel billet thickness 230mm.
The hot-rolled transformation induced production method for leading plasticity steel of 780MPa ranks, is controlled in accordance with the following methods in the present embodiment
The technological parameter of each process section processed：
(1) heating process：By heating steel billet, soaking zone temperature is 1220~1260 DEG C, soaking time 30min；
(2) hot-rolled process：Roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two roughing setting up mould
Type calculates；Roughing outlet temperature is 1090~1120 DEG C；910~930 DEG C of finish rolling finishing temperature；
(3) cooling process：Leading portion is taken to be quickly cooled down → air-cooled the refrigerating mode for waiting for temperature → section cooling after finish rolling,
It is quickly cooled to 698~710 DEG C (referred to as this temperature is one section of final temperature in table) with the cooling rate of about 50 DEG C/s first, it is then air-cooled to wait for
Temperature is finally cooled to 410~418 to 672~680 DEG C (referred to as this temperature is two sections of temperature that begin in table) with the cooling rate of about 40 DEG C/s
℃；
(4) coiling process：The steel strip coiling of 410~418 DEG C of temperature be will be cooled into coil of strip, cooled to room temperature to obtain the final product
To the finished steel coils of the present invention.
The hot-rolled transformation induced production method for leading plasticity steel of 980MPa ranks, is controlled in accordance with the following methods in the present embodiment
The technological parameter of each process section processed：
(1) heating process：By heating steel billet, soaking zone temperature is 1180~1220 DEG C, soaking time 30min；
(2) hot-rolled process：Roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two roughing setting up mould
Type calculates；Roughing outlet temperature is 1020~1048 DEG C；885~890 DEG C of finish rolling finishing temperature；
(3) cooling process：Leading portion is taken to be quickly cooled down → air-cooled the refrigerating mode for waiting for temperature → section cooling after finish rolling,
It is quickly cooled to 712~720 DEG C (referred to as this temperature is one section of final temperature in table) with the cooling rate of about 40 DEG C/s first, it is then air-cooled to wait for
Temperature is finally cooled to 415~420 to 680~690 DEG C (referred to as this temperature is two sections of temperature that begin in table) with the cooling rate of about 30 DEG C/s
℃；
(4) coiling process：The steel strip coiling of 415~420 DEG C of temperature be will be cooled into coil of strip, cooled to room temperature to obtain the final product
To the finished steel coils of the present invention.
The hot-rolled transformation induced production method for leading plasticity steel of 1100MPa ranks, carries out in accordance with the following methods in the present embodiment
Control the technological parameter of each process section：
(1) heating process：By heating steel billet, soaking zone temperature is 1140~1170 DEG C, soaking time 30min；
(2) hot-rolled process：Roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two roughing setting up mould
Type calculates；Roughing outlet temperature is 938~950 DEG C；816~830 DEG C of finish rolling finishing temperature；
(3) cooling process：It is taken after finish rolling and rolls rear leading portion and be quickly cooled down technique, with the fast quickly cooling of cooling rate of about 40 DEG C/s
But to 370~380 DEG C；
(4) coiling process：The steel strip coiling of 370~380 DEG C of temperature be will be cooled into coil of strip, cooled to room temperature to obtain the final product
To the finished steel coils of the present invention.
Specific controlled rolling and cooling process parameter is as shown in table 1.
The controlled rolling and cooling process parameter of 1 embodiment 1 of table
The controlled rolling and cooling process parameter of 1 embodiment 1 of table
Microscopic examination and Mechanics Performance Testing, test are carried out to the hot-rolled transformation induction plasticity steel sampling being prepared
It is specifically shown in Table 2 with analysis result.Attached drawing 1 is the hot-rolled transformation for the 780MPa ranks that in the embodiment of the present invention prepared by technique 1-III
The micro-organization chart of inducing plasticity steel；Attached drawing 2 is the hot rolling phase for the 980MPa ranks that in the embodiment of the present invention prepared by technique 1- V
Become the micro-organization chart of inducing plasticity steel；Attached drawing 3 is the hot rolling for the 1100MPa ranks that in the embodiment of the present invention prepared by technique 1- Ⅸ
The micro-organization chart of transformation induced plasticity steel.It can by the test analysis result of calculation of Analysis on Microstructure and each phase volume fraction
Know, each grade of steel hot-rolled transformation being prepared in the embodiment of the present invention induces plasticity steel by ferrite, bainite and residual austenite
Body forms, in transmission electron microscope it is observed that tiny V (C, N) precipitation particles is dispersed with to disperse in matrix, according to related side
Method carries out the contribution ＞ 200MPa (as shown in Fig. 4) for estimating it to the strength of materials.
The mechanical property of 2 embodiment 1 of table and microscopic structure volume fraction
Embodiment 2
The chemical composition of the tapping molten steel of steel billet includes C by weight percentage in the present embodiment：0.23%, Si：0.13%,
Mn：1.65%, V：0.20%, Alt：0.060%, N：0.040%, P：0.006%, S：0.004%, surplus be Fe and other not
Evitable impurity, steel billet thickness 230mm.
The hot-rolled transformation induced production method for leading plasticity steel of 780MPa ranks, is controlled in accordance with the following methods in the present embodiment
The technological parameter of each process section processed：
(1) heating process：By heating steel billet, soaking zone temperature is 1240~1260 DEG C, soaking time 20min；
(2) hot-rolled process：Roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two roughing setting up mould
Type calculates；Roughing outlet temperature is 1090~1095 DEG C；910~918 DEG C of finish rolling finishing temperature；
(3) cooling process：Leading portion is taken to be quickly cooled down → air-cooled the refrigerating mode for waiting for temperature → section cooling after finish rolling,
It is quickly cooled to 705~710 DEG C (referred to as this temperature is one section of final temperature in table) with the cooling rate of about 40 DEG C/s first, it is then air-cooled to wait for
Temperature is finally cooled to 416~420 to 670~672 DEG C (referred to as this temperature is two sections of temperature that begin in table) with the cooling rate of about 40 DEG C/s
℃；
(4) coiling process：The steel strip coiling of 416~420 DEG C of temperature be will be cooled into coil of strip, cooled to room temperature to obtain the final product
To the finished steel coils of the present invention.
The hot-rolled transformation induced production method for leading plasticity steel of 980MPa ranks, is controlled in accordance with the following methods in the present embodiment
The technological parameter of each process section processed：
(1) heating process：By heating steel billet, soaking zone temperature is 1170~1200 DEG C, soaking time 20min；
(2) hot-rolled process：Roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two roughing setting up mould
Type calculates；Roughing outlet temperature is 1044~1050 DEG C；865~870 DEG C of finish rolling finishing temperature；
(3) cooling process：Leading portion is taken to be quickly cooled down → air-cooled the refrigerating mode for waiting for temperature → section cooling after finish rolling,
It is quickly cooled to 710~715 DEG C (referred to as this temperature is one section of final temperature in table) with the cooling rate of about 40 DEG C/s first, it is then air-cooled to wait for
Temperature is finally cooled to 400~406 to 680~682 DEG C (referred to as this temperature is two sections of temperature that begin in table) with the cooling rate of about 30 DEG C/s
℃；
(4) coiling process：The steel strip coiling of 400~406 DEG C of temperature be will be cooled into coil of strip, cooled to room temperature to obtain the final product
To the finished steel coils of the present invention.
The hot-rolled transformation induced production method for leading plasticity steel of 1100MPa ranks, carries out in accordance with the following methods in the present embodiment
Control the technological parameter of each process section：
(1) heating process：By heating steel billet, soaking zone temperature is 1150~1170 DEG C, soaking time 20min；
(2) hot-rolled process：Roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two roughing setting up mould
Type calculates；Roughing outlet temperature is 930~948 DEG C；810~816 DEG C of finish rolling finishing temperature；
(3) cooling process：It is taken after finish rolling and rolls rear leading portion and be quickly cooled down technique, with the fast quickly cooling of cooling rate of about 50 DEG C/s
But to 380~384 DEG C；
(4) coiling process：The steel strip coiling of 370~380 DEG C of temperature be will be cooled into coil of strip, cooled to room temperature to obtain the final product
To the finished steel coils of the present invention.
Specific controlled rolling and cooling process parameter is as shown in table 3.
The controlled rolling and cooling process parameter of 3 embodiment 2 of table
Microscopic examination and Mechanics Performance Testing, test are carried out to the hot-rolled transformation induction plasticity steel sampling being prepared
It is specifically shown in Table 4 with analysis result.
The mechanical property of 4 embodiment 2 of table and microscopic structure volume fraction
Embodiment 3
The chemical composition of the tapping molten steel of steel billet includes C by weight percentage in the present embodiment：0.18%, Si：0.20%,
Mn：2.00%, V：0.16%, Alt：0.020%, N：0.020%, P：0.009%, S：0.005%, surplus be Fe and other not
Evitable impurity, steel billet thickness 230mm.
The production method of the hot-rolled transformation induction plasticity steel of different stage, is described according to embodiment 1 in the present embodiment
Method carries out the technological parameter of control each process section, and specific controlled rolling and cooling process parameter is as shown in table 5.
The controlled rolling and cooling process parameter of 5 embodiment 3 of table
Microscopic examination and Mechanics Performance Testing, test are carried out to the hot-rolled transformation induction plasticity steel sampling being prepared
It is specifically shown in Table 6 with analysis result.
The mechanical property of 6 embodiment 3 of table and microscopic structure volume fraction
The present invention is not limited to the embodiment, anyone should learn that the structure made under the inspiration of the present invention becomes
Change, the technical schemes that are same or similar to the present invention are each fallen within protection scope of the present invention.
Technology that the present invention is not described in detail, shape, construction part are known technology.
Claims (7)
1. a kind of hot-rolled transformation of steel multistage induces plasticity steel, it is characterised in that：The chemical composition of steel billet is by weight percentage
Including C：0.18~0.23%, Si≤0.20%, Mn：1.50~2.00%, V：0.16~0.20%, Alt：0.020~
0.060%, N：0.020~0.040%, and P≤0.020% is limited, S≤0.005%, surplus is Fe and other are inevitable
Impurity.
2. a kind of production method of the economical cold-rolled transformation induced plasticity of steel multistage, it is characterised in that：By the steel billet
Heating steel billet process, hot-rolled process, cooling process, coiling process are used successively, prepare the thickness of transformation induced plasticity steel product
Metric lattice are 3.0~5.0mm, cover tri- kinds of tensile strength ranks of 780MPa, 980MPa and 1100MPa.
3. a kind of production method of the economical cold-rolled transformation induced plasticity of steel multistage according to claim 2,
It is characterized in that：The steel billet thickness is 230mm.
4. a kind of production method of the economical cold-rolled transformation induced plasticity of steel multistage according to claim 2,
It is characterized in that：In the hot-rolled process, when hot-rolled finished product thickness is 3.0mm, it is 40mm that roughing, which exports base thickness,；When being rolled into
Product thickness is 4.0mm, and it is 45mm that roughing, which exports base thickness,；When hot-rolled finished product thickness is 5.0mm, roughing outlet base thickness is
50mm。
5. a kind of production method of the economical cold-rolled transformation induced plasticity of steel multistage according to claim 2,
It is characterized in that：The technological parameter of each process section in the production method of the other transformation induced plasticity steel of 780MPa tensile strength grades
For：
(1) heating process：By heating steel billet, setting soaking zone temperature is 1220~1260 DEG C, and soaking time is no more than 30min；
(2) hot-rolled process：Roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two roughing setting up model meter
It calculates；Roughing outlet temperature is 1090~1120 DEG C；910~930 DEG C of finish rolling finishing temperature；
(3) cooling process：It is taken after finish rolling and rolls rear leading portion and be quickly cooled down technique, be quickly cooled to the cooling rate of >=40 DEG C/s
690~710 DEG C；Then air-cooled to wait for temperature to 660~680 DEG C；Finally 400~420 DEG C are cooled to the cooling rate of >=30 DEG C/s；
(4) coiling process：The steel strip coiling of 400~420 DEG C of temperature be will be cooled into coil of strip, cooled to room temperature obtains this
The finished steel coils of invention.
6. a kind of production method of the economical cold-rolled transformation induced plasticity of steel multistage according to claim 2,
It is characterized in that：The technological parameter of each process section in the production method of the other transformation induced plasticity steel of 980MPa tensile strength grades
For：
(1) heating process：By heating steel billet, setting soaking zone temperature is 1170~1220 DEG C, and soaking time is no more than 30min；
(2) hot-rolled process：Roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two roughing setting up model meter
It calculates；Roughing outlet temperature is 1020~1050 DEG C；860~890 DEG C of finish rolling finishing temperature；
(3) cooling process：It is taken after finish rolling and rolls rear leading portion and be quickly cooled down technique, be quickly cooled to the cooling rate of >=40 DEG C/s
700~720 DEG C；Then air-cooled to wait for temperature to 670~690 DEG C；Finally 400~420 DEG C are cooled to the cooling rate of >=30 DEG C/s；
(4) coiling process：The steel strip coiling of 400~420 DEG C of temperature be will be cooled into coil of strip, cooled to room temperature obtains this
The finished steel coils of invention.
7. a kind of production method of the economical cold-rolled transformation induced plasticity of steel multistage according to claim 2,
It is characterized in that：The technique ginseng of each process section in the production method of the other transformation induced plasticity steel of 1100MPa tensile strength grades
Number is：
(1) heating process：By heating steel billet, setting soaking zone temperature is 1220~1240 DEG C, soaking time≤30min；
(2) hot-rolled process：Roughing mill and the sub-distribution of finishing mill road and each percentage pass reduction are by level two roughing setting up model meter
It calculates；Roughing outlet temperature is 1030~1050 DEG C；840~860 DEG C of finish rolling finishing temperature, and ensure finishing stand extreme trace time pressure
Rate >=10%；It is taken after finish rolling and rolls rear leading portion and be quickly cooled down technique, 620 are quickly cooled to the cooling rate of 20~40 DEG C/s~
It 650 DEG C, is batched, coils of hot-rolled steel is made；
(3) acid rolls process：Then the above-mentioned coils of hot-rolled steel of pickling uses 65.0~69.0% drafts to carry out to remove oxide
Cold rolling；
(4) continuous annealing process：Steel band after acid is rolled carries out continuous annealing, 800~820 DEG C of soaking temperature, slow cooling section end temp
720~730 DEG C, 400~420 DEG C of rapid cooling section end temp, 380~400 DEG C of overaging section temperature；
(5) smooth process：Smooth elongation control is 0.8 ± 0.1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810509260.XA CN108642387A (en) | 2018-05-24 | 2018-05-24 | A kind of the hot-rolled transformation induction plasticity steel and its production method of steel multistage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810509260.XA CN108642387A (en) | 2018-05-24 | 2018-05-24 | A kind of the hot-rolled transformation induction plasticity steel and its production method of steel multistage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108642387A true CN108642387A (en) | 2018-10-12 |
Family
ID=63757931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810509260.XA Pending CN108642387A (en) | 2018-05-24 | 2018-05-24 | A kind of the hot-rolled transformation induction plasticity steel and its production method of steel multistage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108642387A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182672A (en) * | 2018-10-26 | 2019-01-11 | 山东钢铁集团日照有限公司 | A method of producing the economical cold rolling DP590 steel of different yield strength ranks |
| CN109321827A (en) * | 2018-10-26 | 2019-02-12 | 山东钢铁集团日照有限公司 | A method of producing the economical hot rolling DP780 steel of different yield strength ranks |
| CN109355573A (en) * | 2018-12-03 | 2019-02-19 | 东北大学 | A kind of steel multistage hot rolled steel plate and its manufacturing method based on carbon distribution technique |
| CN109778062A (en) * | 2018-12-28 | 2019-05-21 | 首钢集团有限公司 | A kind of tensile strength 1200MPa grades of cold rolling Multiphase Steels and preparation method thereof |
| CN109868421A (en) * | 2019-04-01 | 2019-06-11 | 山东钢铁集团日照有限公司 | A kind of production method improving hot rolling DP780 steel yield tensile ratio and reaming performance |
| CN109972036A (en) * | 2019-04-01 | 2019-07-05 | 山东钢铁集团日照有限公司 | A kind of hot rolling Q&P1180 steel and its manufacturing method with different yield tensile ratios |
| CN109988969A (en) * | 2019-04-01 | 2019-07-09 | 山东钢铁集团日照有限公司 | A kind of cold rolling Q&P1180 steel and its production method with different yield tensile ratios |
| CN110004361A (en) * | 2019-04-01 | 2019-07-12 | 山东钢铁集团日照有限公司 | A kind of production method improving cold rolling DP980 steel yield tensile ratio and reaming performance |
| CN110578094A (en) * | 2019-10-18 | 2019-12-17 | 山东钢铁集团日照有限公司 | Preparation method of 1.0GPa grade cold-rolled TRIP-BF steel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942601A (en) * | 2010-09-15 | 2011-01-12 | 北京科技大学 | Manufacturing method of transformation induced plasticity steel containing V hot rolling |
| CN103215423A (en) * | 2013-04-18 | 2013-07-24 | 首钢总公司 | Production method of hot rolled and phase-change induced plastic steel coil |
| CN103898404A (en) * | 2014-04-28 | 2014-07-02 | 莱芜钢铁集团有限公司 | Vanadium-microalloyed hot-rolled transformation induced plasticity steel and preparation method |
| CN106834640A (en) * | 2017-03-07 | 2017-06-13 | 华北理工大学 | A kind of manufacture method of low-alloy structural steel hot rolled steel plate |
-
2018
- 2018-05-24 CN CN201810509260.XA patent/CN108642387A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942601A (en) * | 2010-09-15 | 2011-01-12 | 北京科技大学 | Manufacturing method of transformation induced plasticity steel containing V hot rolling |
| CN103215423A (en) * | 2013-04-18 | 2013-07-24 | 首钢总公司 | Production method of hot rolled and phase-change induced plastic steel coil |
| CN103898404A (en) * | 2014-04-28 | 2014-07-02 | 莱芜钢铁集团有限公司 | Vanadium-microalloyed hot-rolled transformation induced plasticity steel and preparation method |
| CN106834640A (en) * | 2017-03-07 | 2017-06-13 | 华北理工大学 | A kind of manufacture method of low-alloy structural steel hot rolled steel plate |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182672A (en) * | 2018-10-26 | 2019-01-11 | 山东钢铁集团日照有限公司 | A method of producing the economical cold rolling DP590 steel of different yield strength ranks |
| CN109321827A (en) * | 2018-10-26 | 2019-02-12 | 山东钢铁集团日照有限公司 | A method of producing the economical hot rolling DP780 steel of different yield strength ranks |
| CN109355573A (en) * | 2018-12-03 | 2019-02-19 | 东北大学 | A kind of steel multistage hot rolled steel plate and its manufacturing method based on carbon distribution technique |
| CN109778062A (en) * | 2018-12-28 | 2019-05-21 | 首钢集团有限公司 | A kind of tensile strength 1200MPa grades of cold rolling Multiphase Steels and preparation method thereof |
| CN109778062B (en) * | 2018-12-28 | 2020-09-15 | 首钢集团有限公司 | Cold-rolled complex phase steel with tensile strength of 1200MPa and preparation method thereof |
| CN109868421A (en) * | 2019-04-01 | 2019-06-11 | 山东钢铁集团日照有限公司 | A kind of production method improving hot rolling DP780 steel yield tensile ratio and reaming performance |
| CN109972036A (en) * | 2019-04-01 | 2019-07-05 | 山东钢铁集团日照有限公司 | A kind of hot rolling Q&P1180 steel and its manufacturing method with different yield tensile ratios |
| CN109988969A (en) * | 2019-04-01 | 2019-07-09 | 山东钢铁集团日照有限公司 | A kind of cold rolling Q&P1180 steel and its production method with different yield tensile ratios |
| CN110004361A (en) * | 2019-04-01 | 2019-07-12 | 山东钢铁集团日照有限公司 | A kind of production method improving cold rolling DP980 steel yield tensile ratio and reaming performance |
| CN109972036B (en) * | 2019-04-01 | 2021-09-10 | 山东钢铁集团日照有限公司 | Hot-rolled Q & P1180 steel with different yield ratios and manufacturing method thereof |
| CN109988969B (en) * | 2019-04-01 | 2021-09-14 | 山东钢铁集团日照有限公司 | Cold-rolled Q & P1180 steel with different yield ratios and production method thereof |
| CN110578094A (en) * | 2019-10-18 | 2019-12-17 | 山东钢铁集团日照有限公司 | Preparation method of 1.0GPa grade cold-rolled TRIP-BF steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108642387A (en) | A kind of the hot-rolled transformation induction plasticity steel and its production method of steel multistage | |
| CN108559919A (en) | The economical cold-rolled transformation induced plasticity and its production method of one steel multistage | |
| CN108517468A (en) | A kind of economical cold-rolled biphase steel and its production method of steel multistage | |
| CN103849812B (en) | Low fragility 700MPa level steel for automobile crossbeam and manufacture method thereof | |
| CN101643880B (en) | High tensile strength hot rolled ferrite bainite dual phase steel and preparation method thereof | |
| CN106119702A (en) | A kind of 980MPa level hot-rolled high-strength height reaming steel and manufacture method thereof | |
| CN108754307A (en) | A method of producing the economical cold rolling DP780 steel of different yield strength ranks | |
| CN108570627A (en) | A method of producing the cold rolling DP980 steel of different yield strength ranks | |
| CN110453154B (en) | 700 MPa-grade steel for automobile torsion beam and preparation method thereof | |
| CN109881106A (en) | A kind of 780MPa grade hot dip galvanized dual phase steel producing different yield strength ranks and its production method | |
| CN103667880B (en) | High hole expansion steel plate with tensile strength of 440MPa and manufacturing method thereof | |
| CN112442632B (en) | High-bending-resistance hot-rolled hot-forming steel and preparation method thereof | |
| CN109136755A (en) | A kind of automobile cold-rolled high strength steel and its production method | |
| CN109988969A (en) | A kind of cold rolling Q&P1180 steel and its production method with different yield tensile ratios | |
| CN109852900A (en) | A kind of 600MPa grade hot dip galvanized dual phase steel and its production method with different yield tensile ratios | |
| CN112080692A (en) | 280 MPa-grade cold-rolled low-yield-ratio stamping steel for automobile structure and production method thereof | |
| CN112210724B (en) | ESP (electronic stability program) production-based high-strength hot forming steel and method | |
| CN110029286A (en) | A kind of 780MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof | |
| CN104060170B (en) | A kind of hot rolled steel plate and production method thereof | |
| CN103469058B (en) | Tensile strength 450MPa level has Ferrite bainitic steel and the production method thereof of high reaming performance | |
| CN103898404B (en) | A kind of vanadium micro-alloying hot-rolled transformation induction plasticity steel and preparation method | |
| CN107419177A (en) | Tensile strength for automobile is the hot rolling acid-cleaning steel and its manufacture method of 540MPa levels | |
| CN109988970A (en) | A kind of cold rolling Q&P980 steel and its production method with different yield tensile ratios | |
| CN110983180B (en) | Hot-rolled high-strength steel and preparation method and application thereof | |
| CN107587070A (en) | Hot rolling broadband leaf spring steel and its production method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181012 |
|
| RJ01 | Rejection of invention patent application after publication |