CN106868403A - A kind of great surface quality galvanizing TRIP steel plates and its manufacture method - Google Patents
A kind of great surface quality galvanizing TRIP steel plates and its manufacture method Download PDFInfo
- Publication number
- CN106868403A CN106868403A CN201710191847.6A CN201710191847A CN106868403A CN 106868403 A CN106868403 A CN 106868403A CN 201710191847 A CN201710191847 A CN 201710191847A CN 106868403 A CN106868403 A CN 106868403A
- Authority
- CN
- China
- Prior art keywords
- galvanizing
- strip
- manufacture method
- steel plates
- trip steel
- 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.)
- Granted
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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- 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
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
Abstract
The invention discloses a kind of great surface quality galvanizing TRIP steel plates and its manufacture method, the chemical composition and percentage by weight of the galvanizing TRIP steel plates are：C 0.10~0.15%, Mn 1.20%~1.80%, P≤0.030%, S≤0.030%, Als 1.20%~2.40%, balance of Fe and inevitable impurity.Its manufacture method comprises the following steps：Continuous-casting steel-making hot rolling cold rolled continuous annealing galvanizing.The galvanizing TRIP steel plates that the present invention is prepared, its tissue morphology is：Ferrite+bainite+retained austenite+martensite, grain size number is 10.5~11 grades, and tensile strength is 640~670MPa, yield strength is 395~465MPa, elongation percentage >=30%, strength and ductility product can reach more than 23GPa%, with good surface quality, mechanical property and decay resistance.
Description
Technical field
Steel making field is used the invention belongs to hot dip galvanizing automobile, and in particular to a kind of great surface quality galvanizing TRIP steel plates
And its manufacture method.
Background technology
TRIP steel refers to retained austenite tissue in finished product tissue, and austenite undergoes phase transition induced plasticity deformation, plays phase
Become the effect of reinforcing.TRIP steel has the advantage of the aspect such as high-strength plasticity and crash absorption capacity high, more and more should
Used in automobile manufacture industry, it is mainly used in automotive safety structural member, chassis member, such as：B posts inner panel, bumper, collision prevention girders etc., be
There is the high-strength vehicle steel of application prospect very much.In order to improve TRIP product made from steel corrosion resistance in use, it is necessary to
Painting plating is carried out in surface of steel plate, wherein most widely used, production efficiency highest method is exactly to carry out continuous hot-dipping galvanizing.
But because there is selective oxygen in annealing process in alloying element higher in TRIP steel, especially Si and Mn
Change, cause plate surface quality to decline, have a strong impact on the platability of steel plate.Because alloying element silicon, manganese element more hold compared to iron
Easily there is oxidation reaction with oxygen, this problem can not be fully solved from process aspect.By so that Al is for Si and controls adding for Si, Mn
The composition design method of dosage, such that it is able to solve the problems, such as selective oxidation well.
Have been disclosed for many galvanized steel plain sheets and its production method in the prior art, but they exist mostly it is certain not
Foot.Chinese patent CN1985016A disclosed in 20 days June in 2007, discloses a kind of tensile strength 590MPa~1080MPa grades
High-strength hot-dip galvanized steel sheet and its manufacture method, chemical composition mass content be C：(0.03~0.25) %, Si：(0.05
~2.0) %, Mn：(0.5~2.5) %, P≤0.03%, S≤0.02%, Als：(0.01~2.0) %, Si+Als+Mn >=
1.0%, balance of Fe and impurity.The invention provides different composition designs according to multiple performance demand, wherein in different journeys
The elements such as Ni, Cu, Mo, Sn, V or B are added on degree.Especially Ni, Mo, the addition of V alloy element so that production cost increases.
Chinese patent CN101353761A disclosed in 28 days January in 2009, discloses a kind of high strength cold rolling hot dip galvanizing and uses
TRIP steel plates and its manufacture method.Its chemical composition mass content is：C：(0.1~0.4) %, Si：(0.03~0.05) %,
Mn：(0.5~2.5) %, Als：(0.5~2.0) %, P：≤ 0.03%, S：≤ 0.02%, Nb：(0.01~0.10) %, Ti：
(0.01~0.10) %, Cu：(0.1~1.0) %, balance of Fe.By control in steel the constituent content such as C, Mn, Nb, Ti, Cu and
The measures such as technique improve the combination property of TRIP steel.The Cu elements of addition 1%, although the intensity of 50MPa can be improved, but can be damaged
The plasticity of evil TRIP steel, it is necessary to which adding other alloying elements improves plasticity, and the compound addition of various alloying elements is caused to technique
The requirement of control increases, and cost is improved.
Chinese patent CN104451400A disclosed in 25 days March in 2015, discloses a kind of TRIP- of galvanizing by dipping
Added high-strength steel and its production method.Its chemical composition is C：(0.16~0.20) %, Als：(1.1~1.2) %, Mn：(0.6
~0.8) %, P：(0.06~0.08) %, Si：(0.03~0.05) %, Nb：(0.05~0.07) %, Mo：(0.19~
0.21) %, Cr：(0.19~0.21) %, balance of Fe.Using ultrafast cold, cold rolling high temperature, short time insulation, Bainite Region after hot rolling
Slow cooling and the technique such as continuous annealing is zinc-plated, can effectively shorten the production time, improve efficiency.Added by reducing Si, Mn
Amount, and the alloys such as P, Nb, Mo, Cr raising intensity is added, the selective oxidation in continuous annealing galvanizing process is greatly decreased, carry
Its platability high, it is ensured that its strength and ductility product uses ultrafast refrigeration technique in more than 20GPa% after hot rolling, obvious to equipment requirement
Improve, the addition of noble metal also brings the raising of cost.
2 months 2014 Chinese patent CN103589952A disclosed in 19 days, disclose a kind of RE alloyed TRIP steel.Its
The RE alloyed TRIP steel of chemical composition, slab chemical composition should meet：C (0.18%~0.22) %, Si≤0.8%, Mn
(1.4%~2.4) %, P≤0.020%, S≤0.010%, Als≤0.8%, Nb >=0.025%, La >=0.01% is balance of
Fe and inevitable impurity.The invention is acted on by rare earth element solid-state reaction, and the hundred of the microstructure constituent of balancing material
Divide content, be obtained in that excellent in mechanical performance, tensile strength reaches 600MPa, and yield strength reaches 400MPa, and elongation percentage reaches
More than 20%.But rare earth element commercial applications are restricted, without the condition of popularization.
Chinese patent CN103627953A disclosed in 12 days March in 2014, discloses a kind of insensitive to isothermal time
Multiphase Steel containing aluminium and its production method.C (0.15~0.17) wt%, Si (0.10~0.20) wt%, Mn (1.45~1.55)
Wt%, P≤0.015wt%, S≤0.005wt%, Als (1.20~1.40) wt%, N≤0.0060wt%, balance of Fe.It is uncommon
Hope and obtain taking into account TRIP steel and DP Steel Properties features by hot rolling and cold rolling control, on the other hand solving production line can produce DP steel
With the production problem of TRIP steel.Its composition design is more cheap.But RH annealing furnaces are with the addition of in the technique, can bring part into
This increase.Hot rolling heating-up temperature is adjusted to 1230 DEG C~1290 DEG C (1270 DEG C of embodiment), though heating-up temperature is higher to be easy to follow-up
Controlling hot rolling, but iron scale certainly will increase, and it is bad that coating easily occurs in zinc-plated finished surface.
Five kinds of inventions of the above can meet even more than 600MPa grades TRIP steel requirement, but the addition of alloying element is caused
Product cost increases, while the element such as Si, Mn can cause overlay coating bad；Requirement of the ultrafast refrigeration technique to equipment is substantially carried
It is high；La raw material are difficult to buy, without popularity condition.These can all be unfavorable for that being widely popularized for product is competing with market
Strive.
The content of the invention
The invention provides a kind of great surface quality galvanizing TRIP steel plates and its manufacture method, in its Design of Chemical Composition
Without the expensive alloying element such as Nb, Mo and the Si elements of deterioration surface quality, with reference to hot rolling, cold-rolling galvanization work
Skill, low cost produces 600MPa grades of galvanizing TRIP steel plate of great surface quality.
The technical scheme that the present invention takes is：
A kind of great surface quality galvanizing TRIP steel plates, its chemical composition and percentage by weight are：C 0.10~0.15%,
Mn 1.20~1.80%, P≤0.030%, S≤0.030%, Als 1.20~2.40%, balance of Fe are miscellaneous with inevitable
Matter.
Further, its chemical composition and percentage by weight are：C 0.14%, Mn 1.4%, P 0.020%, S
0.005%, Als 1.50%, balance of Fe and inevitable impurity.
Further, its chemical composition and percentage by weight are：C 0.12%, Mn 1.60%, P 0.010%, S
0.003%, Als 2.0%, balance of Fe and inevitable impurity.
C：C is most important alloying element in TRIP steel, is necessary to obtaining enough mechanical properties, while C conducts
Quenching degree element, the dissolubility difference using C in ferrite and austenite, C can play stable residual austenite, keep away as far as possible
Exempt from austenite and be changed into bainite or martensite, it is ensured that when room temperature is cooled to, still have portion of residual austenite remaining.But carbon
Content is unsuitable too high, the welding performance of too high infringement material.Therefore, the present invention controls 0.1~0.15% C content.
Mn：Mn can promote hardenability, by solution strengthening, improve intensity, while Mn can promote austenite to change, surely
Determine austenite, help to reduce martensite start temperature, suppress pearlite and formed.But Mn high is easily caused banded structure,
The easy surface enrichment during annealing, easily produces the defects such as surface plating leakage simultaneously, therefore, the present invention controls Mn contents
1.2~1.8%.
P：P is mainly solid-solubilized in steel as the harmful impurity element in steel, and the presence of P can significantly reduce the toughness of steel,
Cause cold working fragility.Additionally, there is P serious segregation to be inclined to, the diffusion velocity very little in ferrite and austenite, it is difficult to
Eliminated by follow-up heat treatment, usual P content control is below 0.03%.
S：S is the harmful element in steel, wherein in mainly there is solid steel in the form of the FeS, its maximum harm is to cause
Steel causes cracking in hot-working, it usually needs S in Mn purification steel is added toward steel.Needed in actual control control S it is residual
Stay, usual S contents control is below 0.03%.
Als：Al is ferrite stabilizing element, and ferritic formation can be promoted during insulation and cooling, suppression
C transfers, stable residual austenite in retained austenite processed.Al will not cause finished product compared with Si because of Element surface enrichment simultaneously
Surface quality defect.In welding, if Al content is too high, the oxide of Al is easily formed in welding region, damage weldability
Energy.Therefore, the present invention controls 1.2~2.4% Als contents.
Present invention also offers the manufacture method of above-mentioned great surface quality galvanizing TRIP steel plates, the manufacture method includes
Following steps：
(1) continuous-casting steel-making；
(2) hot rolling；
(3) it is cold rolling；
(4) continuous annealing galvanizing.
Further, in the step (1), bag target temperature is controlled 10~40 DEG C more than liquidus temperature in continuous casting,
Dynamic soft-reduction is used in casting cycle, to reduce or eliminate center porosity and center segregation defect.
Further, in the step (2), the control of strand tapping temperature at 1210~1250 DEG C, soaking time 2.5~
3.5h, tapping temperature needs lean control, and unsuitable too high, temperature is too high to generate more iron scales, for the surface of finished product
Quality tool has a significant impact, such as pressure oxygen, iron scale remove after residual pit, it is inconsistent to still suffer from surface after offseting, and makes
Into uneven coating etc.；Hot rolling finishing temperature is controlled at 860~900 DEG C, prevents deformation-induced ferrite transformation and deformation excessive,
Ferrite forms banded structure in deformation band forming core；Hot-rolling coiling temperature is controlled at 610~670 DEG C, if temperature is too high, shape
Into ferrite it is thick with pearlite, and the tissue for being allowed to after annealing is thick；And temperature is too low, bainite structure is formed, made cold
Roll rolling load increase.
Further, in the step (3), cold rolling reduction ratio >=55% is beneficial to the improvement of annealing process.
Further, the step (4) specifically includes following steps：
Cold-strip steel is heated to 150 DEG C of preheatings by (4-1), and firing rate is 3~6 DEG C/s；
(4-2) is further heated to 780~820 DEG C by the strip of preheating, in the process cold rolling pearlite and iron element
Body is recrystallized, and austenite generation is begun with when temperature is more than Ac1；
Strip after (4-3) heating is incubated 60~120s at 780~820 DEG C carries out two-phase section annealing, is realized during being somebody's turn to do
The element of the stable austenites such as partial saturation, C, Mn in ferrite is shifted in austenite；
Strip after insulation is slowly cooled to 670~710 DEG C by (4-4) with the speed of 2~4 DEG C/s, part during being somebody's turn to do
Austenite decomposition separates out newborn ferrite, and C, Mn element are further enriched with the austenite not changed so that do not change Ovshinsky
Body stability is supplemented；
(4-5) and then strip is cooled to 470~500 DEG C soon with the speed of 15~40 DEG C/s, cooldown rate occurs slowly excessively
Pearlite or bainite, reduce plate property；Cooldown rate is too fast, to production equipment requirement improve, production degree of difficulty and
Manufacturing cost can relative increase；
(4-6) strip carries out 3~6s of galvanizing by dipping at 450~470 DEG C, and less than 250 DEG C are cooled to after going out zinc pot；
(4-7) strip is cooled to less than 100 DEG C through hardening groove.
With the addition of the elements such as a certain amount of C, Mn, Als in galvanizing TRIP steel plates disclosed by the invention, by continuous casting,
The excellent steel of hot rolling, cold rolling, continuous annealing hot dip galvanizing process control availability.
The galvanizing TRIP steel plates that are produced of the present invention, its tissue morphology is：Ferrite+bainite+retained austenite+horse
Family name's body, grain size number is 10.5~11 grades, and tensile strength is 640~670MPa, and yield strength is 395~465MPa, is extended
Rate >=30%, strength and ductility product can reach more than 23GPa%.On the premise of ensureing that galvanized sheet surfacing, coating are functional,
There is high intensity, good cold formability ability, crash absorption capacity and corrosion resistance again.Its low production cost, is adapted to city
Field is promoted, with the good market demand and application prospect.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of the galvanizing TRIP steel plates that embodiment 1 is obtained；
Fig. 2 is the heat tinting metallographic structure figure of the galvanizing TRIP steel plates that embodiment 1 is obtained；
Fig. 3 is the SEM figures of the galvanizing TRIP steel plates that embodiment 1 is obtained；
Fig. 4 is the SEM figures of the galvanizing TRIP steel plates that embodiment 1 is obtained；
Specific embodiment
A kind of great surface quality galvanizing TRIP steel plates, its chemical composition and percentage by weight are：C 0.10~0.15%,
Mn 1.20%~1.80%, P≤0.030%, S≤0.030%, Als 1.20%~2.40%, balance of Fe and inevitable
Impurity.
The manufacture method of above-mentioned galvanizing TRIP steel plates is as follows：
(1) continuous-casting steel-making；
(2) hot rolling；
(3) it is cold rolling；
(4) continuous annealing galvanizing.
Further, in the step (1), the control of bag target temperature is 10~40 DEG C more than liquidus temperature in continuous casting；
Further, in the step (2), the control of strand tapping temperature at 1210~1250 DEG C, soaking time 2.5~
3.5h,；Hot rolling finishing temperature is controlled at 860~900 DEG C；Hot-rolling coiling temperature is controlled at 610~670 DEG C.
Further, in the step (3), cold rolling reduction ratio >=55%.
Further, the step (4) specifically includes following steps：
Cold-strip steel is heated to 150 DEG C of preheatings by (4-1), and firing rate is 3~6 DEG C/s；
(4-2) is further heated to 780~820 DEG C by the strip of preheating；
Strip after (4-3) heating is incubated 60~120s at 780~820 DEG C carries out two-phase section annealing；
Strip after insulation is slowly cooled to 670~710 DEG C by (4-4) with 2~4 DEG C of speed；
(4-5) and then strip is cooled to 470~500 DEG C soon with the speed of 15~40 DEG C/s；
(4-6) strip carries out 3~6s of galvanizing at 450~470 DEG C, and less than 250 DEG C are cooled to after going out zinc pot；
(4-7) strip is cooled to less than 100 DEG C through hardening groove.
With reference to embodiment 1-4, the present invention is described in detail.
Embodiment 1
A kind of great surface quality galvanizing TRIP steel plates, its chemical composition and percentage by weight are：C 0.14%, Mn
1.4%, P 0.020%, S 0.005%, Als 1.50%, balance of Fe and inevitable impurity.
The manufacture method of above-mentioned great surface quality galvanizing TRIP steel plates, comprises the following steps：
(1) continuous-casting steel-making；
The content of molten iron target S after KR desulfurization is 0.005%；LF stoves refinings is strengthened to C in steel, Mn, Als, P content
Control；The control of bag target temperature uses dynamic soft-reduction to reduce 20 DEG C more than liquidus temperature in continuous casting in casting cycle
Or eliminate center porosity and center segregation defect.
(2) hot rolling；
Strand tapping temperature is controlled in 1230 DEG C, soaking time 3.0h；Hot rolling finishing temperature is controlled at 880 DEG C；Hot rolled coil
Temperature control is taken at 650 DEG C.
(3) it is cold rolling：Cold rolling reduction ratio is 60%.
(4) continuous annealing galvanizing, specifically includes following steps：
Cold-strip steel is heated to 150 DEG C of preheatings by (4-1), and firing rate is 4.5 DEG C/s；
(4-2) is further heated to 790 DEG C by the strip of preheating；
Strip after (4-3) heating is incubated 80s at 790 DEG C carries out two-phase section annealing；
Strip after insulation is slowly cooled to 680 DEG C by (4-4) with the speed of 3 DEG C/s.
(4-5) and then strip is cooled to 470 DEG C soon with the speed of 25 DEG C/s；
(4-6) strip carries out galvanizing 5s at 460 DEG C, and less than 250 DEG C are cooled to after going out zinc pot；
(4-7) strip is cooled to less than 100 DEG C through hardening groove.
The metallographic structure figure and heat tinting metallographic structure figure of the galvanizing TRIP steel plates for obtaining, respectively as shown in Figure 1 and Figure 2, its
Tissue morphology is：Ferrite+bainite+retained austenite+martensite, grain size number is 11 grades.Fig. 3 and Fig. 4 is galvanizing
The scanning electron microscope (SEM) photograph of TRIP steel plates, as can be seen from the figure galvanizing TRIP steel plates are without plating leakage defect, and even zinc layer is good.
Embodiment 2
A kind of great surface quality galvanizing TRIP steel plates, its chemical composition and percentage by weight are：C 0.12%, Mn
1.60%, P 0.010%, S 0.003%, Als 2.0%, balance of Fe and inevitable impurity.
The manufacture method of above-mentioned great surface quality galvanizing TRIP steel plates, comprises the following steps：
(1) continuous-casting steel-making；
The content of molten iron target S after KR desulfurization is 0.003%；LF stoves refinings is strengthened to C in steel, Mn, Als, P content
Control；The control of bag target temperature uses dynamic soft-reduction to reduce 25 DEG C more than liquidus temperature in continuous casting in casting cycle
Or eliminate center porosity and center segregation defect.
(2) hot rolling；
Strand tapping temperature is controlled in 1250 DEG C, soaking time 2.5h；Hot rolling finishing temperature is controlled at 900 DEG C；Hot rolled coil
Temperature control is taken at 670 DEG C.
(3) it is cold rolling：Cold rolling reduction ratio 58%.
(4) continuous annealing galvanizing, specifically includes following steps：
Cold-strip steel is heated to 150 DEG C of preheatings by (4-1), and firing rate is 4 DEG C/s；
(4-2) is further heated to 790 DEG C by the strip of preheating；
Strip after (4-3) heating is incubated 80s at 790 DEG C carries out two-phase section annealing；
Strip after insulation is slowly cooled to 685 DEG C by (4-4) with the speed of 3 DEG C/s.
(4-5) and then strip is cooled to 485 DEG C soon with the speed of 30 DEG C/s；
(4-6) strip carries out galvanizing 6s at 452 DEG C, and less than 250 DEG C are cooled to after going out zinc pot；
(4-7) strip is cooled to less than 100 DEG C through hardening groove.
Embodiment 3
A kind of great surface quality galvanizing TRIP steel plates, its chemical composition and percentage by weight are：C 0.10%, Mn
1.20%, P 0.025%, S 0.004%, Als 1.80%, balance of Fe and inevitable impurity.
The manufacture method of above-mentioned great surface quality galvanizing TRIP steel plates, comprises the following steps：
(1) continuous-casting steel-making；
The content of molten iron target S after KR desulfurization is 0.004%；LF stoves refinings is strengthened to C in steel, Mn, Als, P content
Control；The control of bag target temperature uses dynamic soft-reduction to reduce 17 DEG C more than liquidus temperature in continuous casting in casting cycle
Or eliminate center porosity and center segregation defect.
(2) hot rolling；
Strand tapping temperature is controlled in 1215 DEG C, soaking time 3.5h；Hot rolling finishing temperature is controlled at 860 DEG C；Hot rolled coil
Temperature control is taken at 630 DEG C.
(3) it is cold rolling：Cold rolling reduction ratio 55%.
(4) continuous annealing galvanizing, specifically includes following steps：
Cold-strip steel is heated to 150 DEG C of preheatings by (4-1), and firing rate is 5 DEG C/s；
(4-2) is further heated to 800 DEG C by the strip of preheating；
Strip after (4-3) heating is incubated 75s at 800 DEG C carries out two-phase section annealing；
Strip after insulation is slowly cooled to 695 DEG C by (4-4) with the speed of 2 DEG C/s.
(4-5) and then strip is cooled to 495 DEG C soon with 15 DEG C/s speed；
(4-6) strip carries out galvanizing 4s at 465 DEG C, and less than 250 DEG C are cooled to after going out zinc pot；
(4-7) strip is cooled to less than 100 DEG C through hardening groove.
Embodiment 4
A kind of great surface quality galvanizing TRIP steel plates, its chemical composition and percentage by weight are：C 0.15%, Mn
1.80%, P 0.015%, S 0.003%, Als 1.20%, balance of Fe and inevitable impurity.
The manufacture method of above-mentioned great surface quality galvanizing TRIP steel plates, comprises the following steps：
(1) continuous-casting steel-making；
The content of molten iron target S after KR desulfurization is 0.003%；LF stoves refinings is strengthened to C in steel, Mn, Als, P content
Control；The control of bag target temperature uses dynamic soft-reduction to reduce 28 DEG C more than liquidus temperature in continuous casting in casting cycle
Or eliminate center porosity and center segregation defect.
(2) hot rolling；
Strand tapping temperature is controlled in 1230 DEG C, soaking time 2.8h；Hot rolling finishing temperature is controlled at 898 DEG C；Hot rolled coil
Temperature control is taken at 630 DEG C.
(3) it is cold rolling：Cold rolling reduction ratio 63%.
(4) continuous annealing galvanizing, specifically includes following steps：
Cold-strip steel is heated to 150 DEG C of preheatings by (4-1), and firing rate is 6 DEG C/s；
(4-2) is further heated to 810 DEG C by the strip of preheating；
Strip after (4-3) heating is incubated 78s at 810 DEG C carries out two-phase section annealing；
Strip after insulation is slowly cooled to 705 DEG C by (4-4) with the speed of 4 DEG C/s.
(4-5) and then strip is cooled to 500 DEG C soon with the speed of 40 DEG C/s；
(4-6) strip carries out galvanizing 3s at 470 DEG C, and less than 250 DEG C are cooled to after going out zinc pot；
(4-7) strip is cooled to less than 100 DEG C through hardening groove.
The performance of the preparation-obtained each galvanizing TRIP steel plates of above example is as shown in table 1：
The performance of the preparation-obtained galvanizing TRIP steel plates of each embodiment of table 1
Note：Decay resistance testing experiment, sample zinc coating thickness 50/50g/m2, salt spray test is using ASTM B117 marks
It is accurate.
From accompanying drawing and table 1 as can be seen that the galvanizing obtained according to chemical composition disclosed by the invention and manufacture method
TRIP steel plates, it has good surface quality, mechanical property and decay resistance..
The above-mentioned detailed description carried out to great surface quality galvanizing TRIP steel plates and its manufacture method with reference to embodiment, be
It is illustrative rather than limited, several embodiments can be included according to limited scope, therefore do not departing from the present invention
Changing and modifications under general plotting, should belong within protection scope of the present invention.
Claims (8)
1. a kind of great surface quality galvanizing TRIP steel plates, it is characterised in that its chemical composition and percentage by weight are：C 0.10
~0.15%, Mn 1.20~1.80%, P≤0.030%, S≤0.030%, Als 1.20~2.40%, balance of Fe and not
Evitable impurity.
2. great surface quality galvanizing TRIP steel plates according to claim 1, it is characterised in that its chemical composition and weight
Percentage is：C 0.14%, Mn 1.4%, P 0.020%, S 0.005%, Als 1.50%, balance of Fe and inevitable
Impurity.
3. great surface quality galvanizing TRIP steel plates according to claim 1, it is characterised in that its chemical composition and weight
Percentage is：C 0.12%, Mn 1.60%, P 0.010%, S 0.003%, Als 2.0%, balance of Fe and inevitable
Impurity.
4. the manufacture method of the great surface quality galvanizing TRIP steel plates according to claim 1-3 any one, its feature
It is that the manufacture method is comprised the following steps：
(1) continuous-casting steel-making；
(2) hot rolling；
(3) it is cold rolling；
(4) continuous annealing galvanizing.
5. manufacture method according to claim 4, it is characterised in that in the step (1), bag target temperature control in continuous casting
System uses dynamic soft-reduction 10~40 DEG C more than liquidus temperature in casting cycle.
6. manufacture method according to claim 4, it is characterised in that in the step (2), strand tapping temperature control exists
1210~1250 DEG C, 2.5~3.5h of soaking time；Hot rolling finishing temperature is controlled at 860~900 DEG C；Hot-rolling coiling temperature is controlled
At 610~670 DEG C.
7. manufacture method according to claim 4, it is characterised in that in the step (3), cold rolling reduction ratio >=55%.
8. manufacture method according to claim 4, it is characterised in that the step (4) specifically includes following steps：
Cold-strip steel is heated to 150 DEG C of preheatings by (4-1), and firing rate is 3~6 DEG C/s；
(4-2) is further heated to 780~820 DEG C by the strip of preheating；
Strip after (4-3) heating is incubated 60~120s at 780~820 DEG C carries out two-phase section annealing；
Strip after insulation is slowly cooled to 670~710 DEG C by (4-4) with the speed of 2~4 DEG C/s.
(4-5) and then strip is cooled to 470~500 DEG C soon with the speed of 15~40 DEG C/s；
(4-6) strip carries out 3~6s of galvanizing at 450~470 DEG C, and less than 250 DEG C are cooled to after going out zinc pot；
(4-7) strip is cooled to less than 100 DEG C through hardening groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710191847.6A CN106868403B (en) | 2017-03-28 | 2017-03-28 | A kind of great surface quality hot galvanizing TRIP steel plate and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710191847.6A CN106868403B (en) | 2017-03-28 | 2017-03-28 | A kind of great surface quality hot galvanizing TRIP steel plate and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106868403A true CN106868403A (en) | 2017-06-20 |
| CN106868403B CN106868403B (en) | 2019-07-02 |
Family
ID=59160087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710191847.6A Active CN106868403B (en) | 2017-03-28 | 2017-03-28 | A kind of great surface quality hot galvanizing TRIP steel plate and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106868403B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108441763A (en) * | 2018-03-23 | 2018-08-24 | 马钢(集团)控股有限公司 | A kind of tensile strength 1000MPa grades of cold rollings galvanizing by dipping high-strength steel and preparation method thereof |
| CN110964882A (en) * | 2019-11-27 | 2020-04-07 | 本钢板材股份有限公司 | One-steel dual-purpose cold-rolled high-strength steel based on carbon distribution process and manufacturing method thereof |
| CN111020129A (en) * | 2019-10-25 | 2020-04-17 | 本钢板材股份有限公司 | 700 MPa-grade cold-rolled TRIP steel plate and production method thereof |
| CN113584395A (en) * | 2021-08-05 | 2021-11-02 | 攀钢集团攀枝花钢铁研究院有限公司 | 450 MPa-grade hot-galvanized dual-phase steel and production method thereof |
| CN115181896A (en) * | 2021-04-02 | 2022-10-14 | 宝山钢铁股份有限公司 | 980 MPa-grade low-carbon low-alloy hot-dip galvanized TRIP steel and rapid heat treatment hot-dip galvanizing manufacturing method |
| CN115261738A (en) * | 2022-07-28 | 2022-11-01 | 马鞍山钢铁股份有限公司 | 560 MPa-grade galvanized high-strength steel plate with excellent coating adhesion and production method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876967A (en) * | 2012-08-06 | 2013-01-16 | 马钢(集团)控股有限公司 | Aluminum hot galvanizing dual-phase steel plate with tensile strength of 600 MPa and preparation method of aluminum hot galvanizing dual-phase steel plate |
| CN105063311A (en) * | 2015-09-18 | 2015-11-18 | 东北大学 | Processing method for improving surface quality of TRIP steel |
| CN106167875A (en) * | 2016-09-29 | 2016-11-30 | 马钢(集团)控股有限公司 | A kind of strength and ductility product economical high strength cold-rolled TRIP steel more than 20GPa % and preparation method thereof |
-
2017
- 2017-03-28 CN CN201710191847.6A patent/CN106868403B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876967A (en) * | 2012-08-06 | 2013-01-16 | 马钢(集团)控股有限公司 | Aluminum hot galvanizing dual-phase steel plate with tensile strength of 600 MPa and preparation method of aluminum hot galvanizing dual-phase steel plate |
| CN105063311A (en) * | 2015-09-18 | 2015-11-18 | 东北大学 | Processing method for improving surface quality of TRIP steel |
| CN106167875A (en) * | 2016-09-29 | 2016-11-30 | 马钢(集团)控股有限公司 | A kind of strength and ductility product economical high strength cold-rolled TRIP steel more than 20GPa % and preparation method thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108441763A (en) * | 2018-03-23 | 2018-08-24 | 马钢(集团)控股有限公司 | A kind of tensile strength 1000MPa grades of cold rollings galvanizing by dipping high-strength steel and preparation method thereof |
| CN108441763B (en) * | 2018-03-23 | 2019-11-19 | 马钢(集团)控股有限公司 | A kind of tensile strength 1000MPa grades of cold rollings galvanizing by dipping high-strength steel and preparation method thereof |
| CN111020129A (en) * | 2019-10-25 | 2020-04-17 | 本钢板材股份有限公司 | 700 MPa-grade cold-rolled TRIP steel plate and production method thereof |
| CN110964882A (en) * | 2019-11-27 | 2020-04-07 | 本钢板材股份有限公司 | One-steel dual-purpose cold-rolled high-strength steel based on carbon distribution process and manufacturing method thereof |
| CN115181896A (en) * | 2021-04-02 | 2022-10-14 | 宝山钢铁股份有限公司 | 980 MPa-grade low-carbon low-alloy hot-dip galvanized TRIP steel and rapid heat treatment hot-dip galvanizing manufacturing method |
| CN115181896B (en) * | 2021-04-02 | 2023-09-12 | 宝山钢铁股份有限公司 | 980 MPa-grade low-carbon low-alloy hot dip galvanized TRIP steel and rapid heat treatment hot dip galvanizing manufacturing method |
| CN113584395A (en) * | 2021-08-05 | 2021-11-02 | 攀钢集团攀枝花钢铁研究院有限公司 | 450 MPa-grade hot-galvanized dual-phase steel and production method thereof |
| CN115261738A (en) * | 2022-07-28 | 2022-11-01 | 马鞍山钢铁股份有限公司 | 560 MPa-grade galvanized high-strength steel plate with excellent coating adhesion and production method thereof |
| CN115261738B (en) * | 2022-07-28 | 2023-08-15 | 马鞍山钢铁股份有限公司 | 560 MPa-level galvanized high-strength steel plate with excellent coating adhesion and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106868403B (en) | 2019-07-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8999085B2 (en) | High manganese steel strips with excellent coatability and superior surface property, coated steel strips using steel strips and method for manufacturing the steel strips | |
| CN111979489B (en) | 780 MPa-grade high-plasticity cold-rolled DH steel and preparation method thereof | |
| EP2581465B1 (en) | Hot-stamp-molded article, process for production of steel sheet for hot stamping, and process for production of hot-stamp-molded article | |
| CN112048680B (en) | Alloyed hot-dip galvanized DH980 steel and preparation method thereof | |
| US9255313B2 (en) | Steel sheet for hot press forming having low-temperature heat treatment property, method of manufacturing the same, method of manufacturing parts using the same, and parts manufactured by the same | |
| CN106868403B (en) | A kind of great surface quality hot galvanizing TRIP steel plate and its manufacturing method | |
| EP1227167B1 (en) | Hot dip zinc plated steel sheet and method for producing the same | |
| CN110777290B (en) | Hot-dip galvanized aluminum-magnesium high-strength steel, preparation method and application | |
| JP2009503267A (en) | Method for producing high-strength steel sheet having excellent ductility and steel sheet produced thereby | |
| JP2013044022A (en) | Hot-dip galvanized steel sheet and manufacturing method therefor | |
| CN109023055B (en) | High-strength high-formability automobile steel plate and production process thereof | |
| CN111979488A (en) | 780 MPa-grade alloying hot-dip galvanized DH steel and preparation method thereof | |
| JP5251207B2 (en) | High strength steel plate with excellent deep drawability and method for producing the same | |
| CN109097681B (en) | High-strength low-inclusion automobile steel plate and electromagnetic stirring process thereof in continuous casting process | |
| CN113348255A (en) | Cold rolled steel sheet | |
| CN115612934A (en) | 590 MPa-level high-formability hot-dip galvanized dual-phase steel plate and preparation method thereof | |
| KR101159896B1 (en) | Ultra high strength steel having excellent formability and galvanizing property, and method for producing the same | |
| JP4428075B2 (en) | High-strength hot-dip galvanized steel sheet excellent in stretch flangeability and method for producing the same | |
| EP2925898B1 (en) | A cold-rolled and continuously annealed high strength steel strip or sheet having a good deep-drawability and a method for producing said steel strip or sheet | |
| CN115151673B (en) | Steel sheet, member, and method for producing same | |
| CN115210398B (en) | Steel sheet, member, and method for producing same | |
| KR101129863B1 (en) | High strength steel having excellent formability and galvanizing property, and method for producing the same | |
| JPH04333526A (en) | Hot rolled high tensile strength steel plate having high ductility and its production | |
| CN117248165A (en) | Preparation method of low-spot-welding carbon equivalent alloyed galvanized dual-phase steel | |
| CN116815061A (en) | 780 MPa-grade low-spot-welding carbon equivalent alloyed galvanized dual-phase steel and preparation method thereof |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |