CN106319356A - High manganese hot-dip galvanized steel sheet containing rare earth and manufacture method thereof - Google Patents
High manganese hot-dip galvanized steel sheet containing rare earth and manufacture method thereof Download PDFInfo
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Abstract
The invention relates to a high manganese hot-dip galvanized steel sheet containing rare earth and a manufacture method thereof. The high manganese hot-dip galvanized steel sheet comprises the following chemical components by chemical component: 0.4-0.8% of C, 14-20% of Mn, 0.05-0.15% of RE, less than or equal to 0.020% of P, less than or equal to 0.012% of S, 1.0-2.0% of Al, 0.01-0.03% of N, and the balance of Fe and unavoidable impurity, and Mn+20*C are greater than or equal to 30%, and Al+5*Re are greater than or equal to 1.8%. The method employs a cold rolling-continuous annealing for pickling-galvanizing technology, the steel plate yield strength is 450-650 MPa, the tensile strength is 980-1100 MPa, the elongation percentage is more than 50%, structure under room temperature is 100% of austenite, the recrystallization fraction is 80-95%, the delayed cracking performance is good, and the steel sheet has superhigh strength and high mouldability. The steel sheet is especially suitable for vehicle structural members and safety members with high shaping performance and corrosion resistance as well as complex shapes, such as side door beam, bumpers, floor tunnels, various beams and b columns.
Description
Technical field
The invention belongs to hot-dip galvanizing sheet steel field, be specifically related to a kind of containing rare-earth high-Mn hot-dip galvanizing sheet steel and
Its manufacture method, its yield strength 450～650MPa, tensile strength 980～1100MPa, extension
Rate, more than 50%, is particularly suitable for manufacturing shape extremely complex, to forming property and corrosion resisting property all
Exigent structural member and safety member, such as side door beams, bumper, floor tunnel, each
Kind of beam is of heap of stone and B post etc..
Background technology
A large amount of use intensity ultrahigh-strength steel plates more than 780MPa rank substitutes orthodox car and uses
Steel, is that the optimal material of automobile realization " loss of weight is energy-conservation, improve safety and reduction manufacturing cost " solves
Scheme, to building, low-carbon (LC) social meaning is great, wherein, the advanced high intensity vapour based on phase transformation strengthening
The development and application of automobile-used steel has become as one of main flow problem of each big steel company of world research.
Traditional unimach brings the bright of plasticity and forming property while realizing high intensity
Thin decline, it is difficult to meet the following demand to high formability automobile unimach of automobile industry.
By add in steel a certain amount of austenite stabilizer element such as C, Mn, Cu etc. obtain quite than
The austenite structure of example, can increase substantially the mechanical performance of material.The highest C, Mn contain
The full austenite steel of amount, when its tensile strength reaches 1000MPa, elongation percentage is up to more than 50%.
Compared with common cold-rolled products, galvanizing product is with its excellence rust resistance much, on automobile
Usage amount averagely can reach more than 80%, and the consumption of some vehicle is even up to 100%.Galvanizing is high
Mn austenitic steel will have broad application prospects.But, owing to high Mn composition designs so that
High Mn austenitic steel surface is easily formed the Mn oxygen of zinc liquid wettability difference before galvanizing in annealing process
Compound, thus cause steel plate platability poor, it is difficult with conventional hot dip galvanizing process and obtain satisfied use
The galvanizing effect required and quality of coating.
The platability improving high Mn steel is a study hotspot, and prior art focuses mostly on and using certain
Element or control annealing process are to improve surface of steel plate oxide layer state, to reduce oxide layer as far as possible
Impact, on the one hand these methods need to add Sn etc. in steel and are unfavorable for the element of weldability, another
Aspect is also unfavorable for giving full play to the performance potential of material to the restriction of annealing process, is unsuitable for for making
Make the super-high strength steel of more than tensile strength 980MPa.
Chinese patent 200880014350.6 discloses a kind of to advanced high-strength steel and super-high strength steel band,
Such as dual phase steel, phase change induction plasticity steel, phase change induction plasticity auxiliary dual phase steel and twinning-induced mould
The method that property steel band carries out galvanizing by dipping.This invention is before carrying out galvanizing by dipping to band, to band
Material carries out pickling, and is subsequently heated to the temperature less than continuous annealing temperature, simultaneously before galvanizing
Use reducing atmosphere that steel strip surface is reduced.The galvanizing that this inventive method is carried out produces, can
Obtain the qualified phase change induction plasticity steel of coating, twinning-induced plasticity steel galvanizing steel band.But this
Bright in order to avoid Si, Mn oxide is in surface of steel plate formation, limit the annealing temperature before galvanizing
It it is 400～600 DEG C.The annealing temperature that this temperature range requires well below super-high strength steel, it is impossible to meet
The annealing process requirement of super-high strength steel.It addition, the surface of steel plate oxide concentration after this invention process is still
Very serious, quality of zinc for hot galvanizing can be adversely affected.
International monopoly WO2007075006 (A1) discloses a kind of super-strength height possessing high platability
Plasticity high manganese steel sheet and manufacture method thereof, its composition is: C:0.2～1.5%, Mn:10～25%, Si:
0.05～2.0%, Al:0.1～3.0%, and likely add the elements such as Cr, Ca, Ti, B, surplus
For Fe and impurity.Describing according to this invention, described steel plate possesses preferable platability and mechanical property
Can, but when reaching more than 980MPa tensile strength and 50% extends above rate, yield strength is only
Have less than 400MPa；And the invention steel that yield strength is more than 500MPa, tensile strength and elongation percentage
The most relatively low, such steel performance is difficult to meet the demand of future automobile unimach.
The galvanizing that international monopoly WO2013032173 (A3) discloses a kind of high welding performance is high
Mn steel and manufacture method thereof, its composition is: C:0.3～1.0%, Mn:8～25%, Si:0.1～3.0%,
Al:1～8%, Sn:0.6～0.2, B:0.0005～0.01, remaining for Fe with impurity.This invention steel exists
Under dew point-30～-60 DEG C of atmosphere, anneal 750～850 DEG C of scopes and carry out galvanizing, can obtain and have
High intensity, high formability and high quality of coating.But, it is unfavorable that the addition of Cr controls for material cost.
And, Sn belongs to low melting point element, and fusing point is only 232 DEG C, the impact in weld seam and arsenic As class
Seemingly, welding process easily produces fire check, as weld seam is in high-temperature work environment, easily causes weldering
Seam cracking.Therefore the addition of Sn has very adverse influence to material welding performance.It addition, this
The bright annealing furnace dew point requiring high Mn steel controls below-60 DEG C, to avoid the elements such as Mn
Oxidation, the lowest dew point controls to bring bigger difficulty for large-scale industrial production.
International monopoly WO2007074994 (A1) discloses a kind of galvanizing height Mn steel and manufacture thereof
Method, its composition is: C:0.1～1.5%, Mn:5～35%, and likely add Al, Si, Cr,
The elements such as Cu, Ni, Mo, Nb, V, Zr, it is also possible to add the elements such as Sn, Sb, As, Te.
This invention steel is to obtain corrosion resistance after higher platability and plating.But, this invention steel must add
Enter the alloying elements such as a certain amount of Cr, B, Si, Mo, not only unfavorable to cost control, Er Qieyou
The decline of material thermoplasticity, molten steel poor thermal conductivity, the solidification of molten steel that cause in elements such as Si, B shrink big,
The problem that can bring the aspects such as steel-making, continuous casting, has bigger adverse effect for big production.
High Mn austenitic steel obtains the height from steel industry and Automobile Enterprises with its superior function
Paying close attention to, high Mn austenitic steel has tensile strength and the yield strength of unimach, and ultra-deep punching
The forming property of steel, its large-scale use has important function to the loss of weight of automobile is energy-conservation, and will bring
The change of auto parts design concept.Simultaneously, it is contemplated that on automobile, provide parts with galvanized sheet
And the corrosion resistance of vehicle body is the main flow of autobody sheet, galvanized sheet accounts for the 80% of vehicle body material.Therefore realize
The galvanizing of high Mn austenitic steel produces, for advancing the commercial application of high Mn austenitic steel to have weight
Want meaning.
Summary of the invention
It is an object of the invention to provide a kind of containing rare-earth high-Mn hot-dip galvanizing sheet steel and manufacture method thereof, it is bent
Take intensity 450～650MPa, tensile strength 980～1100MPa, elongation percentage more than 50%,
Delayed fracture is functional, has the high Mn full austenite hot-galvanized steel of superhigh intensity and high formability
Plate；Shape is extremely complex, be desirable that the highest to forming property and corrosion resisting property to be particularly suitable for manufacture
Structural member and safety member, as side door beams, bumper, floor tunnel, various beam are built and B
Post etc..
In order to achieve the above object, the technical scheme that the present invention provides is as follows:
A kind of hot-dip galvanizing sheet steel Han rare-earth high-Mn, its chemical component weight percentage ratio is: C:0.4～0.8%；
Mn:14～20%；RE:0.05～0.15%；P≤0.020%；S≤0.012%；Al:1.0～2.0%；
N:0.01～0.03%；Remaining is Fe and inevitable impurity, and meets, Mn+20 × C >=30%；
Al+5 × RE >=1.8%.
Preferably, in described chemical composition, C:0.5～0.7%；Mn:15～18%；Al:
1.0～1.5%, by weight percentage.
Further, Si≤0.5% in described inevitable impurity, it is preferable that Si≤0.1%.
The present invention containing rare-earth high-Mn hot-dip galvanizing sheet steel, its room temperature texture is full austenite, and surrender is strong
Degree is 450～650MPa, and tensile strength is 980～1100MPa, and elongation percentage is more than 50%.
In the Design of Chemical Composition of the present invention:
C: be maximally effective austenite stabilizer element in steel, material stacking fault energy can be effectively improved, press down
Austenite phase transformation processed, thus improve stabilization of austenite.In potassium steel, add appropriate C, can
Under the austenite of phase same level is stable, significantly reduces Mn content, thus reduce material cost.
Si: be suppression carbide former, it is possible to effectively suppression or the formation of postponement carbide.
But in potassium steel, Si can reduce stabilization of austenite, for keeping complete austenite structure unfavorable,
The most in the present invention, Si is as a kind of impurity element, and content is limited in less than 0.5%.
Mn: be effective austenite stabilizer element.In potassium steel, the effect of Mn is similar with C,
Material stacking fault energy can be effectively improved, reduce martensite transformation temperature Ms, improve stabilization of austenite.
It addition, different from the effect of Mn in ordinary carbon steel, in high Mn austenitic steel, carrying of Mn content
The high reduction that can cause the strength of materials, therefore, on the premise of guaranteeing material stabilization of austenite, needs
To reduce Mn content as far as possible.
Mn+20 × C >=30wt.%: owing to C and Mn can play stable austenite, it is achieved full Ovshinsky
The effect of soma, therefore C and Mn can mutually compensate for a certain extent.The present invention is by big
Amount test data analyzer, confirms when the addition of Mn and C meets relational expression Mn+20 × C >=30wt.%
Time, it can be ensured that in steel of the present invention, austenite has enough stability, to realize room temperature microstructure
For full austenite.
Al: the anti-delayed fracture performance of material can be effectively improved, but the membership that adds of Al significantly deteriorates
The smelting of steel and continuous casting performance, water blocking mouthh when easily causing continuous casting.And smelting and casting process
In, a large amount of Al2O3Formation can reduce molten steel flow, to cause slag, slab problems of crack.
On the premise of guaranteeing that material delayed fracture performance is qualified, Al content needs to reduce as far as possible.
RE: for mischmetal.It is generally acknowledged that the RE (rare earth) effect in steel only improves folder
Foreign material form, purification steel, the raising strength of materials.But in steel of the present invention, RE serves more
Add important effect.On the one hand, RE is good hydrogen-absorbing material, can with H react formation stable
Hydride, thus reduce the diffusible H content in material, improve material anti-delayed fracture performance.High
The delayed fracture problem of manganese austenite steel plate is the most serious factor restricting its industrialization.Existing height
Mn austenitic steel is in order to improve the delayed fracture performance of material, it has to add substantial amounts of Al at steel grade,
Although achieving being obviously improved of delayed fracture performance, but also bring steel-making, casting character aobvious
Write and deteriorate, had a strong impact on the manufacturability of TWIP steel.In steel of the present invention, can be with by RE
Al is compound to be added, and makes Al+5 × RE >=1.8wt.%；Material delayed fracture performance can not reduced
Under premise, reduce the addition of Al, simultaneously work as improving the effect of the mechanical property of materials.The opposing party
Face, secondary cold-rolling is the effective ways improving high manganese austenite hardness of steel, but high Mn austenitic steel adds
Work hardening capacity is the highest, and secondary cold-rolling would generally bring being decreased obviously of plasticity.Adding RE can be effective
Postponement twin generates, thus reduces the work hardening capacity at material deformation initial stage, improves the cold rnning of material
Plasticity after work, beneficially material carry out secondary cold working production.
P: have certain solution strengthening effect.But the membership that adds of P significantly deteriorates material plasticity, fall
Low welding performance, in the present invention using P as impurity element, controls in low-level as far as possible.
S: as far as possible control in relatively low level as its content of impurity element.
N: act on similar with C, be effective austenite stabilizer element, in potassium steel, improves
N content is conducive to increasing stabilization of austenite, improves material property, and in the present invention, N content controls
0.01～0.03%.
The manufacture method containing rare-earth high-Mn hot-dip galvanizing sheet steel of the present invention, comprises the steps:
1) smelting, strand
By mentioned component electric furnace smelting, it is casting continuously to form slab；
2) hot rolling
Heating of plate blank, heating-up temperature 1170～1230 DEG C；Then hot rolling, finishing temperature is 1000 ± 30
℃；Coiling temperature 650～850 DEG C；
3) cold rolling
Pickling, cold rolling, cold rolling reduction 30～60%；
4) annealing
Use straight fire heating or radial canal heating, anneal in continuous annealing furnace, annealing temperature T
Being 650～800 DEG C, annealing time t is 60～180s, and annealing temperature and annealing time
Combination meets following relation: 1900≤Tlgt≤2200, atmosphere is that hydrogen, nitrogen and water steam
The weak oxide atmosphere of gas mixture, annealing atmosphere dew point is 0～10 DEG C, and austenite occurs
Recrystallization；
5) pickling
After annealing, steel plate carries out pickling, acid liquor temperature in the hydrochloric acid solution of concentration 5%～10%
50～70 DEG C, pickling time 10～15s, through overpickling, surface of steel plate forms one layer 1～5 μm
The thick pure ferrite lamellae of low C, Mn, Al；
6) galvanizing processes
Steel plate is heated to 450～800 DEG C, and dew point of atmosphere scope is-40～10 DEG C, zinc-plated, the coldest
But to room temperature, it is thus achieved that steel plate room temperature texture be 100% austenite, recrystallization mark is
80～95%；Yield strength 450～650MPa, tensile strength 950～1100MPa,
Elongation percentage is more than 50%.
In the recrystallization annealing of steel of the present invention, increase annealing temperature and annealing time is all conducive to element
Diffusion, promotes the recrystallization process of austenite.Therefore exist certain between annealing temperature and annealing time
The mutual compensating action of degree.The present invention is analyzed by great number tested data, confirms when annealing temperature T
When meeting relational expression 1900≤Tlgt≤2200 with annealing time t, it can be ensured that obtain suitably after annealing
Full austenite recrystallized structure, to guarantee the performance of steel of the present invention.
The steel plate of the present invention is fully austenitic structure, there is not other type phase transformation, therefore uses hot rolling
What high-temperature heater was incubated act as reducing rolling load, making strand homogenization of composition.
The Mn content of steel plate of the present invention is higher, and direct galvanizing can affect because of surface zinc liquid wettability difference
Platability, therefore, uses continuous annealing before galvanizing, in annealing process, potassium steel completes deformation group
The recrystallization process knitted, it is thus achieved that recrystallization ratio 80～the final tissue of 95%.
Before galvanizing, owing to through the annealing of too high dew point and pickling, there is the lean unit of 1～5 μm on steel plate top layer
Element layer, therefore can effectively stop the reoxidation of the elements such as Mn, Al in matrix, and heating atmosphere is not
Needing special control, dew point is that can to obtain quality of coating under the atmosphere of-40～10 DEG C qualified
Hot-dip galvanizing sheet steel.
Beneficial effects of the present invention:
The present invention uses C, Mn, Al, RE composition design, without expensive alloying element,
Lower cost for material, the product manufacturability cold rolling full Ovshinsky of high Mn good, superior performance can be obtained
Body product made from steel.In potassium steel, add rare earth element, utilize the hydrogen storage property of rare earth element, effectively drop
Al content in low material, is obtaining while preferable anti-delayed fracture performance, the smelting of material,
Continuous casting performance significantly improves.Add RE and also can effectively postpone twin generation, thus reduce material deformation
The work hardening capacity at initial stage, after improving the cold working of material, to carry out secondary cold for plasticity, beneficially material
Processing.Steel of the present invention uses electric furnace smelting, continuous casting, hot rolling, pickling and cold-rolling, galvanizing to produce
Mode, production efficiency is high, properties of product uniformity is good.
The steel plate of the present invention exists through the annealing of too high dew point and the special handling of pickling, surface of steel plate
The low C of 1～5 μm, low Mn, the pure ferrite lamellae of low Al, this ferrite lamellae platability is fine, and
Completely covers TWIP steel matrix, be effectively improved steel plate platability, it is ensured that good quality of zinc for hot galvanizing,
Can ensure that the galvanizing quality of the zinc-plated production of subsequent thermal.
The present invention is moved back pickling-hot dip galvanizing process controlled by suitable composition design and cold rolling-company, permissible
Realize the tensile strength of more than 950MPa and the elongation percentage of more than 50%, and good galvanizing matter
Amount.Shape is extremely complex, be desirable that the highest to forming property and corrosion resisting property to be particularly suitable for manufacture
Structural member and safety member, as side door beams, bumper, floor tunnel, various beam are built and B
Post etc..
Accompanying drawing explanation
Fig. 1 is the hot galvanizing surface figure of the embodiment of the present invention 3.
Fig. 2 is the hot galvanizing surface figure of comparative example 3.
Fig. 3 is the surface texture EBSD collection of illustrative plates of the embodiment of the present invention 3.
Fig. 4 is element depth distribution (GDS) curve of the embodiment of the present invention 3 and embodiment 6.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the invention will be further described.
The composition of the embodiment of the present invention is after smelting, hot rolling, cold rolling, annealing and pickling and galvanizing process
Obtaining containing rare-earth high-Mn hot-dip galvanizing sheet steel, its composition is as shown in table 1, and its annealing process, surface process
Technique, acid cleaning process, hot dip galvanizing process are as shown in table 2, its mechanical property, delayed fracture characteristic,
Quality of coating result is as shown in table 3.
As can be seen from Table 3, the present invention obtain containing rare-earth high-Mn hot-dip galvanizing sheet steel, its room temperature texture is
100% austenite；Recrystallization mark is 80～95%；Yield strength is 450～650MPa, and tension is strong
Degree is 950～1100MPa, and elongation percentage is more than 50%, and quality of coating is qualified.
Fig. 1, Fig. 2 are the results after the material of the embodiment of the present invention 3 and comparative example 3 carries out galvanizing,
The coating of visible employing the present invention program is uniform, and without defects such as plating leakages, comparative example the most almost cannot be entered
Row galvanizing.
Fig. 3 is the surface texture EBSD collection of illustrative plates of the embodiment of the present invention 3, and FCC configuration is austenite,
BCC structure is ferrite, it is seen then that the TWIP steel matrix tissue at complete austenite is dispersed with one
The thick pure ferrite lamellae of layer 1～5um, platability is preferable, it can be ensured that TWIP steel obtains high-quality heat
Galvanizing surface.
Fig. 4 is element depth distribution (GDS) curve of the embodiment of the present invention 3 and embodiment 6, can
Seeing, the surface of steel plate of the present invention all defines the lean element layer of one layer of about 1.7 μ m-thick, and platability is preferable,
Can ensure that TWIP steel obtains high-quality hot galvanizing surface.
The present invention obtain after smelting, hot rolling, cold rolling, annealing and pickling, galvanizing containing rare-earth high-Mn
Hot-dip galvanizing sheet steel, its room temperature texture is 100% austenite；Recrystallization mark is 80～95%；Surrender is strong
Degree 450～650MPa, tensile strength 950～1100MPa, elongation percentage more than 50%, coating
Up-to-standard, before having preferably application in corrosion resistance requires higher automotive safety structural member
Scape, shape is extremely complex, be desirable that the highest to forming property and corrosion resisting property to be particularly suitable for manufacture
Structural member and safety member, as side door beams, bumper, floor tunnel, various beam are built and B
Post etc..
Table 1 unit: percentage by weight
| Sequence number | C | Mn | Al | RE | Si | P | S | N |
| Embodiment 1 | 0.8 | 13 | 1.7 | 0.05 | 0.04 | 0.007 | 0.011 | 0.023 |
| Embodiment 2 | 0.8 | 12 | 1.2 | 0.15 | 0.17 | 0.196 | 0.004 | 0.016 |
| Embodiment 3 | 0.6 | 16 | 1.4 | 0.1 | 0.07 | 0.037 | 0.003 | 0.029 |
| Embodiment 4 | 0.5 | 18 | 1.3 | 0.1 | 0.01 | 0.098 | 0.004 | 0.020 |
| Embodiment 5 | 0.8 | 13 | 2 | 0.05 | 0.12 | 0.044 | 0.012 | 0.022 |
| Embodiment 6 | 0.6 | 15 | 1.5 | 0.1 | 0.12 | 0.039 | 0.007 | 0.013 |
| Embodiment 7 | 0.6 | 17 | 1.9 | 0.05 | 0.20 | 0.081 | 0.003 | 0.024 |
| Embodiment 8 | 0.4 | 20 | 1.6 | 0.05 | 0.01 | 0.012 | 0.008 | 0.023 |
| Embodiment 9 | 0.6 | 16 | 1.3 | 0.1 | 0.14 | 0.082 | 0.004 | 0.030 |
| Embodiment 10 | 0.7 | 14 | 1.4 | 0.1 | 0.12 | 0.147 | 0.003 | 0.029 |
| Embodiment 11 | 0.4 | 19 | 1.1 | 0.15 | 0.10 | 0.118 | 0.009 | 0.014 |
| Embodiment 12 | 0.8 | 14 | 1.5 | 0.1 | 0.08 | 0.183 | 0.004 | 0.026 |
| Embodiment 13 | 0.7 | 15 | 1.1 | 0.15 | 0.05 | 0.108 | 0.010 | 0.016 |
| Embodiment 14 | 0.7 | 15 | 1 | 0.2 | 0.12 | 0.008 | 0.002 | 0.025 |
| Embodiment 15 | 0.6 | 16 | 1.2 | 0.15 | 0.15 | 0.005 | 0.003 | 0.030 |
| Embodiment 16 | 0.5 | 18 | 1.8 | 0.05 | 0.20 | 0.048 | 0.011 | 0.014 |
| Comparative example 1 | 0.6 | 16 | 1.4 | 0.1 | 0.08 | 0.091 | 0.004 | 0.020 |
| Comparative example 2 | 0.45 | 18 | 1.3 | - | 0.09 | 0.015 | 0.005 | 0.012 |
| Comparative example 3 | 0.65 | 15 | 2 | - | ||||
| Comparative example 4 | 0.59 | 15.35 | 1.1 | - |
Table 2
Table 3
Claims (11)
1. a hot-dip galvanizing sheet steel Han rare-earth high-Mn, its chemical component weight percentage ratio is:
C:0.4～0.8%；
Mn:14～20%；
RE:0.05～0.15%；
P≤0.020%；
S≤0.012%；
Al:1.0～2.0%；
N 0.01～0.03%；
Remaining is Fe and inevitable impurity, and meets, Mn+20 × C >=30%；
Al+5 × RE >=1.8%.
The most according to claim 1 containing rare-earth high-Mn hot-dip galvanizing sheet steel, it is characterised in that C content is
0.5～0.7%.
The most according to claim 1 containing rare-earth high-Mn hot-dip galvanizing sheet steel, it is characterised in that Mn content
15～18%.
The most according to claim 1 containing rare-earth high-Mn hot-dip galvanizing sheet steel, it is characterised in that Al content is
1.0～1.5%.
The most according to claim 1 containing rare-earth high-Mn cold-rolled steel sheet, it is characterised in that described can not
Si≤0.5% in the impurity avoided.
The most according to claim 5 containing rare-earth high-Mn cold-rolled steel sheet, it is characterised in that Si content≤0.1
%.
7. according to described in any one of claim 1 to 5 containing rare-earth high-Mn hot-dip galvanizing sheet steel, its feature exists
In, the room temperature texture of described hot-dip galvanizing sheet steel is 100% austenite, and recrystallization mark is
80～95%.
8. according to described in any one of claim 1 to 5 containing rare-earth high-Mn hot-dip galvanizing sheet steel, its feature exists
In, the yield strength of described hot-dip galvanizing sheet steel is 450～650MPa, and tensile strength exists
950～1100MPa, elongation percentage is more than 50%.
9. according to the manufacture method containing rare-earth high-Mn hot-dip galvanizing sheet steel described in any one of claim 1 to 8,
Comprise the steps:
1) smelting, strand
By mentioned component after electric furnace smelting, continuous casting is slab；
2) hot rolling
Heating of plate blank, heating-up temperature 1170～1230 DEG C；Then hot rolling, finishing temperature is 1000 ± 30
℃；Coiling temperature 650～850 DEG C；
3) cold rolling
Pickling, cold rolling, cold rolling reduction 30～60%；
4) annealing
Use straight fire heating or radial canal heating, anneal in continuous annealing furnace, annealing temperature T
Being 650～800 DEG C, annealing time t is 60～180s, and annealing temperature and annealing time
Combination meets following relation: 1900≤Tlgt≤2200, atmosphere is that hydrogen, nitrogen and water steam
The weak oxide atmosphere of gas mixture, annealing atmosphere dew point is 0～10 DEG C, and austenite occurs
Recrystallization；
5) pickling
After annealing, steel plate carries out pickling, acid liquor temperature in the hydrochloric acid solution of concentration 5%～10%
50～70 DEG C, pickling time 10～15s, through overpickling, surface of steel plate forms one layer 1～5 μm
Thick low C, low Mn, the pure ferrite lamellae of low Al；
6) galvanizing processes
Steel plate is heated to 450～800 DEG C, and dew point of atmosphere scope is-40～10 DEG C, zinc-plated, the coldest
But to room temperature.
The most according to claim 9 containing rare-earth high-Mn hot-dip galvanizing sheet steel, it is characterised in that described heat
The room temperature texture of galvanized steel plain sheet is 100% austenite, and recrystallization mark is 80～95%.
11. is according to claim 9 containing rare-earth high-Mn hot-dip galvanizing sheet steel, it is characterised in that described heat
The yield strength of galvanized steel plain sheet is 450～650MPa, and tensile strength, 950～1100MPa, extends
Rate is more than 50%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018214682A1 (en) * | 2017-05-26 | 2018-11-29 | 宝山钢铁股份有限公司 | Hot dipped medium manganese steel and manufacturing method therefor |
| WO2018214683A1 (en) * | 2017-05-26 | 2018-11-29 | 宝山钢铁股份有限公司 | Hot dipped high manganese steel and manufacturing method therefor |
| CN114000062A (en) * | 2021-11-05 | 2022-02-01 | 贵州大学 | Low-temperature-resistant high-toughness structural steel treated by trace rare earth and preparation method thereof |
| WO2023241546A1 (en) * | 2022-06-15 | 2023-12-21 | 宝山钢铁股份有限公司 | Highly formable and easily phosphated high-manganese cold-rolled steel plate having tensile strength of 1000-1600 mpa, and manufacturing method therefor |
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| CN108796383A (en) * | 2017-04-27 | 2018-11-13 | 宝山钢铁股份有限公司 | A kind of titaniferous high-intensity and high-tenacity nonmagnetic steel and its manufacturing method |
| EP3636790A4 (en) * | 2017-05-26 | 2020-10-14 | Baoshan Iron & Steel Co., Ltd. | Hot dipped high manganese steel and manufacturing method therefor |
| WO2018214683A1 (en) * | 2017-05-26 | 2018-11-29 | 宝山钢铁股份有限公司 | Hot dipped high manganese steel and manufacturing method therefor |
| CN108929991A (en) * | 2017-05-26 | 2018-12-04 | 宝山钢铁股份有限公司 | A kind of hot-dip potassium steel and its manufacturing method |
| JP2020521056A (en) * | 2017-05-26 | 2020-07-16 | 宝山鋼鉄股▲分▼有限公司 | Hot-dip galvanized high manganese steel and method for producing the same |
| JP2020521057A (en) * | 2017-05-26 | 2020-07-16 | 宝山鋼鉄股▲分▼有限公司 | Hot dip plated medium manganese steel and method for producing the same |
| WO2018214682A1 (en) * | 2017-05-26 | 2018-11-29 | 宝山钢铁股份有限公司 | Hot dipped medium manganese steel and manufacturing method therefor |
| EP3633061A4 (en) * | 2017-05-26 | 2020-10-21 | Baoshan Iron & Steel Co., Ltd. | Hot dipped medium manganese steel and manufacturing method therefor |
| US11313021B2 (en) | 2017-05-26 | 2022-04-26 | Baoshan Iron & Steel Co., Ltd. | Hot dipped medium manganese steel and manufacturing method therefor |
| US11377712B2 (en) | 2017-05-26 | 2022-07-05 | Baoshan Iron & Steel Co., Ltd. | Hot dipped high manganese steel and manufacturing method therefor |
| CN114000062A (en) * | 2021-11-05 | 2022-02-01 | 贵州大学 | Low-temperature-resistant high-toughness structural steel treated by trace rare earth and preparation method thereof |
| CN114000062B (en) * | 2021-11-05 | 2023-09-22 | 贵州大学 | Low-temperature-resistant high-toughness structural steel treated by trace rare earth and preparation method thereof |
| WO2023241546A1 (en) * | 2022-06-15 | 2023-12-21 | 宝山钢铁股份有限公司 | Highly formable and easily phosphated high-manganese cold-rolled steel plate having tensile strength of 1000-1600 mpa, and manufacturing method therefor |
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