CN107475627B - 600MPa grade analysis of producing hot rolled TRIP and manufacturing method based on CSP process - Google Patents
600MPa grade analysis of producing hot rolled TRIP and manufacturing method based on CSP process Download PDFInfo
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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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
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- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
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- 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
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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
- 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
- C21D2211/005—Ferrite
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a kind of 600MPa grade analysis of producing hot rolled TRIP based on CSP process, the chemical element component and its weight percent contained are as follows: carbon 0.14~0.16%, silicon 0.90~1.20%, manganese 1.20~1.40%, phosphorus 0.07%~0.10%, sulphur≤0.005%, dissolved aluminum 0.015~0.060%, surplus are iron and inevitable impurity.The manufacturing method of the steel includes converter smelting, refining, sheet blank continuous casting, continuous casting billet soaking, high-pressure water descaling, controlled rolling, control is cooling, batches.Designed using economic C-Si-Mn-P ingredient, metallographic structure be 50~65% ferrite, 25~40% bainite and 5~20% retained austenite；Yield strength is 390~450MPa, tensile strength is 600~680MPa, elongation A80It is 28~35%, there is good strong plasticity matching.
Description
Technical field
The invention belongs to steel hot rolled strip production technical fields, and in particular to a kind of 600MPa grade based on CSP process
Analysis of producing hot rolled TRIP and manufacturing method.
Background technique
Raising with people to requirements such as environment, the energy, safety, automobile positive lightweight, high-strength and inexpensive direction
Development is that automobile and steel industry cope with this using AHSS (Advanced high-strength steels, advanced high-strength steel)
The major measure that kind trend is taken jointly.TRIP steel (phase change induction plasticity steel) has high intensity and elongation percentage in AHSS
Match, good comprehensive performance and have attracted much attention.TRIP steel is mainly used to make the baffle of automobile, arrangements for automotive doors fender rod, insurance
Thick stick, vehicle chassis component, rim for automobile wheel and car door impact beam etc..In Japan, TRIP steel plate has been used on production concept chassis
About 80 kinds of parts mitigate about 12% with the pts wt that this steel plate manufactures, every trolley weight saving is about compared with conventional steel plates
14kg, economic benefit are obvious.
With the continuous increase of auto industry energy-saving and emission-reduction pressure, the demand to thin gauge TRIP steel is increasingly urgent to.So
And this automobile TRIP steel mainly uses cold rolling+intercritical annealing technique production, complex process, energy consumption height, cost at present
It is high.And slab continuous casting rolling process is due to temperature control precision with higher, ensure that slab temperature during the rolling process
Uniform stability, has some superiority in the production of thin gauge automobile high-strength steel, and portioned product can be realized " with hot Dai Leng ".
Therefore, the heat treatment process after eliminating cold rolling using bar strip continuous casting and rolling flow path production thin gauge analysis of producing hot rolled TRIP and roll,
Not only it had shortened process but also had saved the energy, and met the development trend of social energy conservation emission reduction, green manufacturing.
The tissue of TRIP steel is generally by the polygonal ferrite of 50~60% (vol.), 25~40% carbides-free bayesian
Body, 5~15% retained austenite composition, good plasticity is by the strain-induced phase transformation of retained austenite in tissue and polygon
The coefficient result of shape ferrite.Thus the polygonal ferrite with proper ratio and retained austenite are that TRIP steel obtains
The precondition of good plasticity.
The structural transformation principle of analysis of producing hot rolled TRIP are as follows:
(1) γ → α transformation first occurs for the austenite of finish rolling non-recrystallization after deforming, and forms 50% or more pro-eutectoid iron
Ferritic.Since the solubility of carbon in pro-eutectoid ferrite is lower, carbon is ostracised and is enriched with into remaining austenite.The ferrite of generation
More, the carbon being accordingly enriched in remaining austenite is more.This is the first stage in analysis of producing hot rolled TRIP retained austenite
Carbon enrichment.
(2) then for fast cooling to coiling temperature, this stage steel is in bainite transformation constant temperature process, a part of Ovshinsky
For body since the element interactions such as Si are changed into carbide-free Bainite, remaining austenite remains further enriched carbon to room
Temperature.This is the carbon enrichment of second stage in TRIP steel retained austenite.
The Chinese patent that grant number is CN103249847B disclose manufacture tensile strength grade be 590MPa, machinability
The method of excellent and small mechanical property deviation high strength cold-rolled/analysis of producing hot rolled TRIP, this method is tied to form using C-Si-Mn to be set up separately
Meter, the height low with excellent elongation percentage and strength and ductility product and mechanical property deviation is produced using thin slab continuous casting and rolling mode
Strength hot rolled TRIP steel.Application publication number is that the Chinese patent of CN106048176A and CN105821190A is disclosed based on ESP
The method that bar strip continuous casting and rolling flow path produces low-carbon, middle carbon analysis of producing hot rolled TRIP, this method is using C-Si-Mn-Mo at setting up separately
Meter, is rolled using ESP sheet billet process, obtains the TRIP steel of different tissues performance, and can solve low-carbon hot-rolling TRIP steel
Thickness is overproof end to end.
Thin slab continuous casting and rolling short-flow production line generally uses the milling train of close-coupled to arrange, milling train is to defeated between coiling machine
Roller-way is usually shorter (70~90m) out, and the automobile steel thickness specification of " with hot Dai Leng " is relatively thin, and mill speed is very fast, will lead to
There is no enough intermediate air cooling times to form the polygonal ferrite of enough ratios (>=50%), then leads to remaining austenite
In there is no enough carbon, ferrite content and paralympic amount are insufficient in the final tissue of formation, and form a certain amount of martensite, deteriorate
The structure property of TRIP steel.And bar strip continuous casting and rolling flow path has unique metallurgy rule, to C, Mn, Al in ingredient design
Content has certain restriction, but above-mentioned patent does not consider factors above, not can solve the production of thin slab continuous casting and rolling short route
The bottleneck problem of line production analysis of producing hot rolled TRIP.
Summary of the invention
Present invention aim to provide a kind of 600MPa grade analysis of producing hot rolled TRIP and manufacturing method based on CSP process,
Its metallographic structure be 50~65% ferrite, 25~40% bainite and 5~20% retained austenite, and yield strength
It is 600~680MPa for 390~450MPa, tensile strength, elongation A80It is 28~35%, there is good strong plasticity matching.
To achieve the above object, the technical solution adopted by the present invention is that: the 600MPa grade hot rolling TRIP based on CSP process
Steel, the chemical element component contained and its weight percent are as follows: carbon 0.14~0.16%, silicon 0.90~1.20%, manganese 1.20~
1.40%, phosphorus 0.07%~0.10%, sulphur≤0.005%, dissolved aluminum 0.015~0.060%, surplus is for iron and inevitably
Impurity.
The chemical component restriction reason of 600MPa grade analysis of producing hot rolled TRIP of the present invention based on CSP process is as follows:
C (carbon): C is strengthened austenite by gap solution strengthening mechanism and enhances the stability of retained austenite.Firstly,
Thin slab continuous casting and rolling CSP process ingredient designs the C equivalent weight range 0.09~0.17% that should avoid hypo-peritectic steel, because working as
0.09% < Ceq < 0.17%, the tendency that continuous casting crackle occurs will dramatically increase.This peritectic steel range should be avoided, when avoiding solidification
The linear shrinkage of slab is larger, and surface longitudinal crack is formed in continuous casting process.Secondly, C content is too low, it is difficult to understand to be not enough to be formed rich carbon
Family name's body, C content is excessively high, can deteriorate welding performance, according to following carbon equivalent formulas finally limit C content range as 0.14~
0.16%, preferably 0.15~0.16%.
Ceq (carbon equivalent)=[C]+0.0146 [Mn] -0.0027 [Si] -0.0385 [Al]2–0.0568[Al]+0.8297
[S]+0.0136[Mn][Si]–0.0104[Si][Al]+0.0026[Si][Al]2+0.0134[Mn][Al]+0.0031[Mn]
[Al]2。
Si (silicon): the main function of Si is that cementite is formed when inhibiting bainite isothermal transformation, and the carbon for improving austenite contains
Amount is to improve its stability.In addition, Si can solution strengthening ferrite, certain intensity is provided；But Si content is high, is easy to make
At de-scaling difficulty, increase scale defect occurrence probability, and coating performance is poor, the final Si content range that limits: 0.90
~1.20%, preferred scope is 1.00~1.20%.
Mn (manganese): Mn increases the harden ability of steel, and stable austenite inhibits the formation of pearlite, increases remained austenite content,
The intensity of ferrite matrix can be also improved by solution strengthening；Mn too high levels can make retained austenite overstabilization, be unfavorable for
The generation of TRIP effect；>=2.5% Mn content easily leads to serious banded structure；>=1.6% Mn content can also give thin plate
Base continuous casting belt carrys out certain difficulty, and high Mn will cause thermal coefficient significant decrease, cause casting blank shell internal-external temperature difference larger；While by
Higher in its linear expansion coefficient, volume contraction is larger during steel billet temperature drop, thus is formed during slab cooling larger
Internal stress, will cause slab surface crack when serious.The final Mn content range that limits: 1.20~1.40%, preferred scope is
1.30~1.40%.
P (phosphorus): P can accelerate pro-eutectoid ferrite to be formed, and a small amount of P (P≤0.10%) is added in steel can effectively prevent
The precipitation of cementite when bainite isothermal transformation is conducive to the reservation of metastable state austenite, while P can be also very effective admittedly
Molten intensified element.When P content is excessively high (> 0.25%), meeting forms phosphide Fe in crystal boundary3P adversely affects performance, most
P content range 0.07~0.10% is limited eventually, and preferred scope is 0.07~0.09%.
Als (dissolved aluminum): Al is the deoxidier of the addition in steel, and 0.015~0.06% Al is conducive to refine crystal grain.
S (sulphur): S, as the harmful element in steel, influences the degree of purity and toughness of steel, by S content be limited to S≤
0.005%.
To achieve the above object, one kind 600MPa grade analysis of producing hot rolled TRIP as described above based on CSP process is also provided
Manufacturing method, comprising the following steps:
1) it smelts
It being uniformly mixed by the ingredient and weight percent and forms molten steel, when smelting, uses pneumatic steelmaking-LF-RH technique,
Molten steel depth desulfurization pretreatment is used in pneumatic steelmaking, guarantees lower S content in steel, carries out deoxidation using calcium and magnesium deoxidier,
The oxygen and aluminium in molten steel are reduced, and improves the form, size and distribution of field trash；After RH vacuum system refining treatment,
Chemical component meets weight percent (wt%) in steel are as follows: and C:0.14~0.16%, Si:0.90~1.20%, Mn:1.20~
1.40%, P:0.07~0.10%, S≤0.005%, Als:0.015~0.060%, remaining is iron and inevitable impurity.
Main chemical compositions preferred scope are as follows: C:0.15~0.16%, Si:1.00~1.20%, Mn:1.30~1.40%, P:0.07
~0.09%.
2) continuous casting
Baotou steel water superheat is 15~20 DEG C in control when continuous casting, slab thickness is 52~55mm, drawing speed be 4.0~
5.5m/min forms continuous-casting sheet billet, guarantees slab quality by suitable molten steel overheat and higher Casting speed；
3) continuous-casting sheet billet soaking
860~880 DEG C of soaking pit charging temperature, bringing-up section temperature T1=1200~1220 DEG C, soaking zone heating temperature is T2
=1120~1150 DEG C, heating cycle is shown in attached drawing 1；
4) de-scaling
Continuous-casting sheet billet, which goes out before soaking pit feed mill, carries out high-pressure water descaling, and control de-scaling water pressure is 280~
420bar；
5) it rolls
The first percentage pass reduction of finishing rolling control is 50~65%, and the second percentage pass reduction is 50~60%, extreme trace time pressure
Rate is 10~15%, and controlled rolling speed is 4~9.5m/s；
The de-scaling between progress rack between the first passage and second time, de-scaling water pressure are 200~280bar；
Finishing temperature is controlled at 800~830 DEG C；
6) cooling
660~720 DEG C, air-cooled 4~10s are cooled to the cooling rate of 50~90 DEG C/s, it is then cold with the cooling rate of >=100 DEG C/s
But it is batched to 380~420 DEG C.
Further, the continuous-casting sheet billet, which enters, carries out de-scaling processing before soaking pit, de-scaling water pressure 300~
400bar。
Further, in the step 3), soaking furnace atmosphere: O is controlled2Content is controlled in 3.0~5.0%, water vapour
Content control≤0.5%.
Further, in the step 6), the type of cooling is ultrafast cold, section cooling, Water-Curta in Cooling, encryption cools down or it
Combination.
600MPa grade analysis of producing hot rolled TRIP manufacturing method provided by the invention based on CSP process, controls each manufacturing step
The reasons why it is as described below:
(1) soaking furnace atmosphere, O are controlled2Amount control is 3.0~5.0%, vapour content≤0.5%；
When oxygen content in furnace≤2.0%, and H2When O steam content > 5.0%, between the raw iron scale of furnace and matrix
Binding force is lower, is easy to the de-scaling containing high Si steel.
(2) using the two-part heating method of low temperature after first high temperature, reason is the iron scale of second segment low-temperature epitaxy
The iron scale adhesion generated with the oxidation of outer layer hot stage is good, and in de-scaling, through-wall crack easy to form is shelled from substrate
It falls, is not easy residual oxidization iron sheet on surface, specific mechanism is shown in attached drawing 2.
(3) for control finishing temperature at 800~830 DEG C, this temperature range, which can guarantee, carries out finish to gauge in austenite one phase area,
The austenite grain of finish rolling end rack can be kept more tiny (8~12 μm) by lower temperature, ferritic forming core can be accelerated.
In addition, can to reduce the time that mill speed runs strip in roller repairing section longer for low temperature finish to gauge, that is, can guarantee longer
Air cooling time.
(4) 660~720 DEG C of medium temperatures are cooled to the cooling rate of 50~90 DEG C/s after rolling, 4~10s of air cooling time passes through
Fast speed is cooled to ferritic transformation curve nose temperature and starts ferritic transformation, generates ratio enough by isothermal in this temperature
The ferrite of example, cooling route and curve are shown in attached drawing 3.
(5) then with the cooling rate of >=100 DEG C/s be cooled to 380~420 DEG C batch carry out bainite isothermal transformation, using compared with
Fast cooling velocity is to inhibit pearlite to be formed, and coiling temperature is excessively high, and the Paralympic Games of formation is decomposed during Slow cooling,
Reduce its stability.
Compared with prior art, the invention has the following advantages that
(1) 600MPa grades of analysis of producing hot rolled TRIP provided by the invention is using economic C-Si-Mn-P ingredient design, metallographic structure
For 50~65% ferrite, 25~40% bainite and 5~20% retained austenite；Yield strength be 390~
450MPa, tensile strength are 600~680MPa, elongation A80It is 28~35%, there is good strong plasticity matching；
(2) by using the two-part soaking pit heating method of low temperature after first high temperature, change iron scale attachment and peel off
And mechanism, the remaining occurrence probability of iron scale is reduced, the surface quality of coil of strip is improved；
(3) thin slab continuous casting and rolling CSP process is based on its higher temperature control precision, ensure that slab in the operation of rolling
The uniform stability of middle temperature, reduces aberrations in property of the strip in width direction and length direction significantly, production it is thin
Size hot-rolled TRIP steel and Cold-Rolled TRIP Steel performance are quite, it can be achieved that " with hot Dai Leng "；
(4) heat treated after eliminating cold rolling using thin slab continuous casting and rolling CSP process production analysis of producing hot rolled TRIP and roll
Journey shortens process and has saved the energy, meets the megatrend of energy-saving and emission-reduction, green manufacturing.
Detailed description of the invention
Fig. 1 is the heating cycle that analysis of producing hot rolled TRIP of the present invention uses in soaking pit；
Fig. 2 is analysis of producing hot rolled TRIP of the present invention iron scale de-scaling mechanism figure after soaking stove heating；
Fig. 3 is the cooling technique route map used in analysis of producing hot rolled TRIP manufacturing method of the present invention.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail, convenient for more clearly understanding the present invention, but it
Limiting the invention.
For analysis of producing hot rolled TRIP of the present invention using converter-thin slab continuous casting and rolling CSP process production, specific steps include converter smelting
Refining, refining, sheet blank continuous casting, continuous casting billet soaking, high-pressure water descaling, controlled rolling, control is cooling, batches.
Steel use pneumatic steelmaking-LF-RH technique when smelting, and molten steel depth desulfurization pretreatment is used in pneumatic steelmaking,
Guarantee lower S content in steel, carries out deoxidation using calcium and magnesium deoxidier, reduce oxygen and aluminium in molten steel, and improve field trash
Form, size and distribution.After RH application of vacuum, the molten steel with the chemical component as shown in the following table 1 number A-E is obtained.Table 1
Middle number F, G is comparative example, and number G is using conventional hot rolling+cold rolling+intercritical annealing technique production 600MP grade cold rolling
TRIP steel.
Table 1
For baotou steel water superheat at 15~20 DEG C, slab thickness is 52~55mm in control when continuous casting, drawing speed 4.0~
5.5m/min guarantees slab quality by suitable molten steel overheat and higher Casting speed.
Slab carries out de-scaling processing before entering soaking pit, and de-scaling water pressure is in 300~400bar；
Control soaking furnace atmosphere, O2Content is controlled in 3.0~5.0%, H2O steam content control≤0.5%；
800 DEG C of soaking pit charging temperature, bringing-up section temperature T1=1200~1220 DEG C, soaking zone heating temperature is T2=
1120~1150 DEG C, heating cycle is shown in attached drawing 1.
Slab carries out high-pressure water descaling before going out soaking pit feed mill, control 280~420bar of de-scaling water pressure.
The first percentage pass reduction of finishing rolling control are as follows: 50~65%, the second percentage pass reduction are as follows: 50~60%, extreme trace time pressure
Lower rate are as follows: 10~15%；Controlled rolling speed is in 4.0~9.5m/s；Between the first passage and second time between progress rack
De-scaling, de-scaling water pressure are 200~280bar；Finishing temperature is controlled at 800~830 DEG C.Enter cooling platform after rolling, with 50~
The cooling rate of 90 DEG C/s is cooled to 660~720 DEG C, then air-cooled 4~10s is cooled to 380~420 DEG C with the cooling rate of >=100 DEG C/s
It is batched.The type of cooling is section cooling mode.
The finish rolling of example and cooling main technologic parameters are shown in Table 2, and example A~E uses 5 ingredients altogether, are high P steel,
For comparative example F in addition to low P, other compositions and example B are essentially identical, and trimmed size is from 1.0~3.0mm, different-thickness gauge steel
Rolling speed interval is from 4.0m/s to 9.4m/s, so as to cause different intermediate air cooling times, from 4.38s~9.52s.
Table 2
The tissue and mechanical property of example and comparative example are shown in Table 3, it can be seen that pass through optimizing components and low temperature finish to gauge work
Skill, the ratio of ferrite and retained austenite ratio of the example coil of strip with different intermediate air cooling times reach TRIP steel
It is required that: for ratio of ferrite from 51% to 66%, retained austenite ratio has lower centre from 8.6~15.2%, example
The example ferrite and retained austenite ratio of air cooling time are relatively slightly lower, the example B-3 containing P and the comparative example for being free of P
F-1 is compared, and other compositions content is essentially identical, but ferrite and retained austenite are significantly increased.Example yield strength
Range is from 395~467MPa, and tensile strength range is from 620~667MPa, elongation A80It is 28.6~34.2%.Strength and ductility product from
18923 arrive 21204MPa%, suitable with using conventional hot rolling+cold rolling+comparative example G performance of intercritical annealing technique.
Table 3
Note: F- ferrite, B- bainite, γ-retained austenite.
It should be pointed out that only the invention will be further described for above-described embodiment, it is other non-with being made according to the present invention
Essence modification or adjustment still fall within protection scope of the present invention.Analysis of producing hot rolled TRIP as described in the present invention and its manufacturing method are bases
In CSP short route, since the different process route of TSCR bar strip continuous casting and rolling flow path has consistent technique thinking, the present invention
Application of the analysis of producing hot rolled TRIP and its manufacturing method in other short route producing lines such as ESP, FTSR ought to be protected in the present invention
Within the scope of.
Claims (4)
1. a kind of manufacturing method of the 600MPa grade analysis of producing hot rolled TRIP based on CSP process, it is characterised in that: the following steps are included:
1) it smelts
It is uniformly mixed by the ingredient and weight percent and forms molten steel, when smelting uses pneumatic steelmaking-LF-RH technique, is turning
Using molten steel depth desulfurization pretreatment, again using RH vacuum system refined molten steel when furnace is made steel；
2) continuous casting
Baotou steel water superheat is 15~20 DEG C in control when continuous casting, slab thickness is 52~55mm, drawing speed be 4.0~
5.5m/min forms continuous-casting sheet billet；
3) continuous-casting sheet billet soaking
860~880 DEG C of soaking pit charging temperature, bringing-up section temperature T1=1200~1220 DEG C, soaking zone heating temperature is T2=
1120~1150 DEG C；
4) de-scaling
Continuous-casting sheet billet carries out high-pressure water descaling before going out soaking pit feed mill, control de-scaling water pressure is 280~420bar；
5) it rolls
The first percentage pass reduction of finishing rolling control is 50~65%, and the second percentage pass reduction is 50~60%, and final reduction rate is
10~15%, and controlled rolling speed is 4~9.5m/s；
The de-scaling between progress rack between the first passage and second time, de-scaling water pressure are 200~280bar；
Finishing temperature is controlled at 800~830 DEG C；
6) cooling
660~720 DEG C are cooled to the cooling rate of 50~90 DEG C/s, then air-cooled 4~10s is cooled to the cooling rate of >=100 DEG C/s
380~420 DEG C are batched；
Wherein, the chemical element component and its weight percent that the 600MPa grade analysis of producing hot rolled TRIP based on CSP process contains are as follows: carbon
0.14~0.16%, silicon 0.90~1.20%, manganese 1.20~1.40%, phosphorus 0.07%~0.10%, sulphur≤0.005%, acid are molten
Aluminium 0.015~0.060%, surplus are iron and inevitable impurity.
2. the manufacturing method of the 600MPa grade analysis of producing hot rolled TRIP according to claim 1 based on CSP process, it is characterised in that:
The continuous-casting sheet billet carries out de-scaling processing before entering soaking pit, and de-scaling water pressure is in 300~400bar.
3. the manufacturing method of the 600MPa grade analysis of producing hot rolled TRIP according to claim 1 or claim 2 based on CSP process, feature exist
In: in the step 3), control soaking furnace atmosphere: O2Content control 3.0~5.0%, vapour content control≤
0.5%.
4. the manufacturing method of the 600MPa grade analysis of producing hot rolled TRIP according to claim 1 or claim 2 based on CSP process, feature exist
In: in the step 6), the type of cooling is ultrafast cold, section cooling, Water-Curta in Cooling, encryption cooling or combinations thereof mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710729013.6A CN107475627B (en) | 2017-08-23 | 2017-08-23 | 600MPa grade analysis of producing hot rolled TRIP and manufacturing method based on CSP process |
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| CN109355577B (en) * | 2018-12-14 | 2022-01-28 | 辽宁衡业高科新材股份有限公司 | Preparation method of 1200 MPa-level heat-treated wheel |
| CN109355576B (en) * | 2018-12-14 | 2022-01-28 | 辽宁衡业高科新材股份有限公司 | Preparation method of 1500 MPa-level heat-treated wheel |
| CN112442638A (en) * | 2019-08-27 | 2021-03-05 | 宝山钢铁股份有限公司 | Hot-rolled wheel steel with tensile strength of 500MPa or more and manufacturing method thereof |
| CN112621107A (en) * | 2019-09-24 | 2021-04-09 | 上海梅山钢铁股份有限公司 | Flash welding method for straight seam of high-strength steel wheel rim |
| CN112760554A (en) * | 2019-10-21 | 2021-05-07 | 宝山钢铁股份有限公司 | High-strength steel with excellent ductility and manufacturing method thereof |
| CN112430772A (en) * | 2020-09-28 | 2021-03-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | CSP flow-based medium-temperature coiling type hot rolling DP600 production method |
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