CN108796382A - It is a kind of adapt to large deformation and easy punching press cover aluminum substrate boron-containing steel and its production method - Google Patents
It is a kind of adapt to large deformation and easy punching press cover aluminum substrate boron-containing steel and its production method Download PDFInfo
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- CN108796382A CN108796382A CN201710287418.9A CN201710287418A CN108796382A CN 108796382 A CN108796382 A CN 108796382A CN 201710287418 A CN201710287418 A CN 201710287418A CN 108796382 A CN108796382 A CN 108796382A
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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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- C21D2211/002—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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
It is a kind of adapt to large deformation and easy punching press cover aluminum substrate boron-containing steel and its production method, chemical component weight percentage is：C≤0.01%, Si≤0.01%, Mn：0.05~0.15%, P≤0.012%, S≤0.006%, Al≤0.005%, N：≤ 0.005%, B：0.0005~0.002%, O：0.024~0.06%, remaining is Fe and inevitable impurity；And meet 0.5≤B/ of relational expression (N-0.0025)≤1.0.300~400MPa of tensile strength of boron-containing steel of the present invention, elongation percentage is 40% or more.Composition of steel of the present invention is that the low C-Si-Mn of approximate pure iron designs and add suitable B, is produced by the way of controlled rolling, simple production process, cost is relatively low.The steel disclosure satisfy that single pass large deformation (80-90%) requirement other than with excellent plasticity and the laminating performance of steel aluminium, and making the covering aluminum plate band of substrate production with it has excellent surface quality.
Description
Technical field
The invention belongs to ultra-low-carbon steel manufacturing field, be related to a kind of adaptation large deformation and easy punching press covers aluminum substrate boron-containing steel
And its production method.
Background technology
It is higher and higher to the performance requirement of metal material with technology and expanding economy, the metal material of single composition
It is often difficult to meet simultaneously the requirement of universality energy in actual use.The metal material for choosing two or more is adopted
Composite board is made with various different process and disclosure satisfy that special comprehensive performance requirement.It is to pass through at ambient temperature to cover aluminum steel
Rolling by aluminium film overlay on belt steel surface formed surface be aluminium, the complex plate strip that sandwich layer is steel, the intensity of existing steel has simultaneously
The thermal diffusivity of aluminium is good, anti-corrosion, light and aesthetic, especially considerably reduces cost.In zero, home appliance panel, automobile
The covering aluminum plate of the fields such as part, food processing pallet application not only requires good steel aluminium bond strength, requires simultaneously
Excellent punching performance and high surface quality, especially below two requirements, the current aluminium product that covers are difficult to meet.
China Patent Publication No. CN102019727 disclose " cooler feran and preparation method thereof and its used in
Steel band and aluminum alloy strip ", describe method, the technique of production composite strip, although being referred to substrate used, it is main
For producing thicker feran, plastic deformation ability is insufficient, it is difficult to which meeting large deformation requirement, (single pass deformation is no more than
70%), and surface quality is poor.
Feran production substrate used deforms in composite strip production process together with the aluminium film on surface, so wanting
Ask with the comparable intensity of aluminium and plasticity, so common intensity is low, plasticity is excellent.But it covers aluminum substrate while it is also desirable to have good
The good laminating performance of steel aluminium, so common Medium And Low Strength Steels, which are difficult to use in, covers aluminum steel production.
Japanese invention JP2005281806 discloses " Low Yield Point Steel and its production method with excellent in toughness ",
It is relatively low to belong to yield strength, the higher low-alloy structural steel of elongation percentage, yield strength is generally in 200MPa or so.These patents one
As be plate product, one be added to based in composition design by lower C-Si-Mn in the alloys such as Cr, Mo, Ni, Cu, B
Kind or Multiple components, are mainly used for the production of anti-seismic damper.
China Patent Publication No. CN101775535A discloses " 160MPa grades of earthquake-resistance low-yield steel, steel plate and its system
Make method ", which is related to being closer to the present invention in mechanical property for steel grade, but other performance and purposes are different.It should
It is plate product that patent, which is related to steel grade, is mainly used for anti-seismic damper making, does not have the good laminating performance of steel aluminium.
China Patent Publication No. CN101525720 discloses a kind of " novel special matrix for being used to prepare feran
Steel band ", steel grade involved by the patent are high alloy ingredient, and wherein Mn contents are seen in 15-30%, rolling deformation, described matrix steel
Band deflection is about 50%, it is difficult to reach the deformation requirements that single pass is up to 90%.This is can be seen that from its patent specification
Patent is related to steel grade and does not take measures to improve strain concentration problem, and travers defect easily occurs in surface.
It can be found from the comparison with existing patent, existing aluminum steel product single pass heavy deformation of covering only has 50%, deposits simultaneously
In strain concentration problem so that travers defect easily occurs in surface, it is difficult to carry out punch process；Although and Low Yield Point Steel is moulded
Property is excellent, has large deformation ability, but steel aluminium binding ability is poor, can not carry out the laminating processing of steel aluminium.
Invention content
The purpose of the present invention is to provide a kind of adaptation large deformation and easy punching press to cover aluminum substrate boron-containing steel and its production
Method, 300~400MPa of tensile strength of the steel grade, elongation percentage is 40% or more.It is laminating with excellent plasticity and steel aluminium
Performance disclosure satisfy that single pass large deformation (80-90%) requirement, and making the covering aluminum plate band of substrate production with it has excellent surface
Quality.
In order to achieve the above objectives, the technical scheme is that：
Composition of steel of the present invention is that the low C-Si-Mn of approximate pure iron is designed and added suitable B, by the way of controlled rolling
Production.
Specifically, aluminum substrate boron-containing steel, chemical composition weight are covered in a kind of adaptation large deformation and easy punching press of the invention
Measuring percentage is：C≤0.01%, Si≤0.01%, Mn：0.05~0.15%, P≤0.012%, S≤0.006%, Al：≤
0.005%, N：≤ 0.005%, B：0.0005~0.002%, O：0.024~0.06%, remaining for Fe and inevitably it is miscellaneous
Matter；And meet 0.5≤B/ of relational expression (N-0.0025)≤1.0.
The microscopic structure of steel of the present invention is uniform isometric columnar ferrite+a small amount of bainite structure.
300~400MPa of tensile strength of the steel, elongation percentage is 40% or more.
For steel plate generally by solution strengthening, the means such as precipitation strength, dislocation strengthening and intercrystalline strengthening improve intensity.The present invention
In composition of steel design：
C can be such that yield strength increases by solution strengthening, and elongation percentage reduces, unfavorable to punching performance；Higher C is easy simultaneously
Position segregation, Surface Quality are unfavorable the dislocation the defects of.According to actual process for making, its content should be reduced as far as possible,
0.01% is the upper limit.
Si is deoxidant element and solution strengthening element, so that yield strength is increased, elongation percentage reduction, but Si appropriate has
Conducive to steel aluminium interfacial combined function is improved, so the upper limit 0.01% of control Si.
Mn is also intensified element common in steel makes elongation percentage reduce by solution strengthening raising yield strength；But it is appropriate
Mn can be combined with the S in steel and generate MnS, lower the red brittleness of steel, but excessively high Mn solid solutions Mn hinders to reply and inhibit again
Crystal grain is grown up, and γ texture (N D ∥ are reduced<111>) intensity, to the stamping very unfavorable of steel plate, so its content
Control is 0.05~0.15%.
Higher P causes " cold short " of steel, so that plasticity and impact flexibility is reduced, and make the welding performance and cold-bending property of steel
It is deteriorated, and P is unfavorable to steel aluminium interface cohesion, so the content of P in steel should be reduced as possible, the control of its content is required to exist in the present invention
0.012% or less.
S is unfavorable to the performance of steel, easily causes " red brittleness " of steel, reduces the low-temperature flexibility of steel, while deteriorating steel aluminium interface
Binding performance.The addition of Mn can form MnS with S, and high-temperature ductility can be improved by improving Mn/S ratios, it is desirable that controlled its S content and existed
0.006% or less.
Al is the important deoxidant element of steel grade, but higher Al is easily diffused into steel aluminium combination interface, and it is strong to deteriorate interface cohesion
Degree.So its content must be controlled in a certain range, require its content with 0.005% for the upper limit in the present invention.
N can form AlN particles with the Al in steel, while N is similar with C, be easy to fault segregation in place and form KESHI gas mass,
Cause strain to be concentrated, influence punching performance, and excessively high N also deteriorates impact flexibility, so controlling its upper content limit and being
0.005%.
B is element extremely active in steel, is easy to C, N and forms compound.B is easy at austenite grain boundary and dislocation simultaneously
Segregation, so as to inhibit the segregation effect of other interstitial atoms here.And the segregation of B does not hinder dislocation motion so that
Strain is uniform.But excessively high B easily promotes the raising of quenching degree to lead to the excessively high reduction punching performance of intensity, so limiting the content of B
0.0005~0.002%, and when N content is higher than 0.0025, the content of B and N meets 0.5≤B/ of relational expression (N-0.0025)
≤1.0。
Oxygen (O) element can inhibit Al elements in steel to it requires and be properly added the detrimental effect of steel aluminium interface cohesion
The O elements of certain content.In addition, since the content of limitation Si, Al in the present invention are in extremely low range, so the oxygen in steel contains
Amount is inevitably higher.But excessively high oxygen will produce rimhole, it is loose the defects of, and aggravate the hot-short effect of sulphur.In steel
Process of setting in, oxygen will largely be precipitated in the form of the oxide, can reduce the plasticity of steel, the processing performances such as impact flexibility.
So limiting its content 0.024~0.06%.
The present invention relates to steel grades, it is desirable that has excellent plasticity to meet and covers aluminium rolling, and in good steel aluminium associativity
Meet single pass large deformation (80-90%), punching press and great surface quality requirement on the basis of energy.Existed by controlling C, N content in steel
0.005% hereinafter, the segregation of adjustment substrate strength and interstitial atom fault in place, solves surface deformation problem of non-uniform, carries
Great surface quality simultaneously ensures punching performance；And the addition of 0.005-0.002B further defines distribution of C, N atom in crystal boundary,
Be conducive to the raising of punching performance；Control Si, Al and O ingredient simultaneously then ensure that invention steel grade with excellent in specific range
Steel aluminium binding ability.And the Composition Control of P, S are conducive to obtain the excellent steel billet of endoplasm, improve the steel aluminium associativity of steel plate
Energy and low-temperature flexibility etc., it is then advantageous to covering aluminium performance to be limited to 0.05-0.15% to the ingredient of Mn.Generally, it is wanted using above-mentioned
The component system asked can obtain the invention steel grade met the requirements.
The production method of the present invention that cover aluminum substrate boron-containing steel for adapting to large deformation and easy punching press comprising,
1) it smelts
By mentioned component through molten iron pretreatment, converter top bottom blowing, external refining, be casting continuously to form slab；
2) slab reheats, 1200 DEG C of heating temperature or more；
3) controlled rolling
Using two sections of controlled rollings, 990 DEG C of roughing end temp or more, accumulative deflection >=80% of rough rolling step；Essence
Roll 960 DEG C of inlet temperature or more, 820~880 DEG C of finish rolling end temp；
4) control cooling, 10 DEG C/s or more of water cooling speed；
5) it batches, 550~600 DEG C of coiling temperature.
In steel production technology of the present invention,
Molten iron pre-processes, and takes off P, S, ensures P, S content low in steel；Converter top bottom blowing controls C content.
Consider Austenite Grain Growth in solubility behavior and heating process of the microalloy element carbonitride in austenite
Behavior, the present invention claims strands to reheat at 1200 DEG C or more, using two sections of controlled rolling techniques.In order to obtain good plate
Shape, it is desirable that steel grade carries out finish to gauge in ferrite area.It can be seen that the iron of steel grade from the continuous cooling curve of Fig. 1 steel grades of the present invention
Ferritic phase transition temperature is ferrite transformation area close to 900 DEG C, while at 700 DEG C or more when cooling rate is more than 1 DEG C/s.So wanting
820~880 DEG C of end temp is rolled in refinement, excessively high to be easily accessible austenite, ferrite two-phase section, easily forms mixed crystal in matrix, together
Shi Yinqi rolls fluctuation, and the thickness control and plate shape to steel band are unfavorable；The too low then Deformation Resistance of temperature increases, and increases rolling
Load so that energy consumption increases.
According to entrance finishing temperature, it is desirable that 960 DEG C of entry temperature at finishing of control or more, 990 DEG C of roughing end temp or more.
In terms of CCT curve, the present invention relates to steel grades to have very wide ferrite area.To realize target capabilities, ensure that recrystallization softening is brilliant
Grain effect, it is desirable that accumulative deflection >=80% of rough rolling step,
To obtain good strip surface quality, the lateral pressure amount of rough rolling step controls within 50mm.Require strand simultaneously
Corner location must not have the defects of stomata, scar, or carry out removing surface.
To obtain the performance of target call, it is desirable that the matrix for controlling steel is isometric columnar ferrite+a small amount of bainite group
It knits.From continuous cooling curve as can be seen that ferrite+a small amount of bainite group that cooling velocity can be obtained in 10 DEG C/s or more
It knits.In view of being quickly cooled down with thinning microstructure and phase transformation deadline, it is intended to be completed in a short time most of ferrite transformation, together
When avoid the formation of pearlitic structrure, cooling velocity that from must controlling in 10 DEG C/s or more.Therefore the present invention relates to after the rolling of steel grade
Cooling rate is controlled in 10 DEG C/s or more.
Coiling temperature is determined according to the transformation temperature and combining target tissue of steel.In terms of Fig. 1, the martensitic traoformation of steel starts temperature
About 536 DEG C of degree, stopping cold temperature will have martensitic structure to be formed less than this temperature, although improving intensity seriously reduces material
The toughness and plasticity of material；Pearlitic structrure will be produced in the base by stopping excessively high such as 600 DEG C of cold temperature, unfavorable to plasticity.In conjunction with
The control difficulty of production, control steel grade batch within the scope of 550~600 DEG C, are cooled to room temperature later.Coiling coater temperature is low
When 550 DEG C, strip local temperature easily fluctuates, and easily forms martensitic structure, causes uneven with structure of steel and performance.
For the abnormal growth of ferrite crystal grain in strip after inhibition finish to gauge, ensure that strip is organized as the shaft-like iron element such as uniform
Body+a small amount of bainite structure, it is desirable that controlled after rolling cooling using preceding cold mode.I.e. strip goes out cold with first group after hot tandem
But water cooling, you can realize 550~600 DEG C and batch.In terms of the pattern of Fig. 2, using+550~600 DEG C of volumes of 820~880 DEG C of rollings
Taking technique can obtain uniform ferritic structure, can't see the presence of bainite.
The invention has the advantages that：
1. steel of the present invention is more than in 300~400MPa, elongation percentage with excellent comprehensive mechanical property, tensile strength
40%, while steel grade has excellent steel aluminium interfacial combined function, is suitable for the production of feran.
2. steel of the present invention has excellent plastic deformation ability, meet single pass deformation 80% or more, even 90% or more
It is required that intermediate reduce production process without annealing, production efficiency is improved.
3. steel deformation of the present invention is uniform, there is excellent punching performance, n values are 0.2 or more；It covers finished product after aluminium while having
Good surface quality can be used for substituting the application of alclad sheet band, and cost is lower, and steel aluminium interfacial combined function more preferably, passes through
550 DEG C heat preservation 5h annealing after steel aluminium interface steel aluminium compound layer thickness 5 μm or less even wholly without.
4. steel of the present invention uses controlled rolling technique productions, simple production process, cost is relatively low, is suitable for the big rule of enterprise
Mould produces.
Description of the drawings
Fig. 1 is static CCT curve (calculating) schematic diagram of steel grade of the present invention.
Fig. 2 is the typical substrates macrograph of steel grade of the present invention.
Specific implementation mode
With reference to embodiment and attached drawing, the present invention will be further described.
Embodiment 1
It according to steel chemical composition of the present invention requirement, is made steel in 500kg vaccum sensitive stoves, obtains chemical composition and be shown in Table 1, pour
100kg steel ingots are cast, billet heating temperature is 1200 DEG C or more, 820~880 DEG C of finishing temperature, 550-600 DEG C of coiling temperature.
The mechanical property of steel embodiment of the present invention is as shown in table 1.Ingredient, production technology and performance have been carried out with close steel grade
Comparison.Wherein,
Compare patent 1：China Patent Publication No. CN101514426A, " yield strength 100MPa meter building aseismicities are bent with low
Clothes point steel and its production method ", Si, Al content are higher, do not contain O.
Compare patent 2, China Patent Publication No. CN101775535A, " 160MPa grades of earthquake-resistance low-yield steel, steel plate and
Its manufacturing method ", Si, Al content are higher, do not contain O.
Compare patent 3：China Patent Publication No. CN101525720, it is " a kind of novel to be used to prepare the special of feran
Substrate ", alloying component are excessively high.
Compare patent 4：Japanese invention publication number JP09067652A, " shock-resistant arrangement steel plate and its production method ", Al contains
Amount is higher.
Steel grade of the present invention has notable difference with above-mentioned four kinds of compared steels on ingredient.
Above-mentioned four kinds of compared steels, which have, requires have higher Si, Al content, and steel grade of the present invention is distinctly claimed Al content and exists
0.005% hereinafter, Si is no more than 0.01%；There is also significantly different, compared steels with compared steel for the O content requirement of steel grade of the present invention
It is to have control to require, and steel grade of the present invention is distinctly claimed control O content between 0.024~0.06%, and add to O content
Micro B is for improving surface quality.In addition, 3 exigent Mn contents of compared steel, the upper control limit of other alloying components
It is high, while compared steel 2 also requires to contain certain Nb, V.So comparison steel grade is bright with steel grade difference of the present invention on ingredient
It is aobvious.
In terms of performance, comparison patent 1,2,4 is required nothing more than with lower yield strength and higher elongation percentage, and of the invention
Steel grade is other than above-mentioned requirements, it is also expressly that it is required that steel grade has good steel aluminium interfacial combined function, is suitable for feran
Production, and require punching performance excellent, n values have good surface quality 0.2 or more after covering aluminium；And it requires simultaneously
The steel grade have big cold-rolling deformation ability, meet single pass deformation 90%, centre without annealing, this be also compared steel 3
Not available.So there is also dramatically different with compared steel for steel grade of the present invention in performance.
In conclusion steel of the present invention is designed using extremely low C-Si-Mn, it is aided with the ingredients such as suitable P, S, Al, B and O, if
Count out it is a kind of covering aluminum substrate with 300~400MPa of tensile strength, meet that elongation percentage is high, steel aluminium laminating performance is good, surface matter
Amount is high and what deformability was strong covers aluminum substrate requirement, and with short production cycle, simple for process, is also met or exceeded in performance
Compare the requirement of steel grade.
Embodiment 2
It is required according to present component, steel of the present invention is smelted on laboratory's 500kg vaccum sensitive stoves.Chemical composition is shown in Table
1.Billet heating temperature is 1220 DEG C, and 820~880 DEG C of finishing temperature rolls rear water cooling and batches or be air-cooled to room to 550~600 DEG C
Temperature, 2~8mm of rolling thickness；Mechanical property is shown in Table 2.
1 unit of table：Weight percent
Table 2
| Embodiment | Plate thickness | Rp0.2/MPa | Rm/MPa | A50/% | N values (2-20) |
| 1 | 2mm | 184 | 312 | 42 | 0.207 |
| 2 | 2.4mm | 243 | 328 | 50 | 0.214 |
| 3 | 2.8mm | 216 | 346 | 48 | 0.247 |
| 4 | 3mm | 208 | 325 | 55 | 0.224 |
| 5 | 3.5mm | 256 | 344 | 43 | 0.218 |
| 6 | 4mm | 261 | 380 | 44 | 0.274 |
| 7 | 6mm | 218 | 315 | 56 | 0.236 |
| 8 | 8mm | 259 | 374 | 52 | 0.252 |
As seen from Table 2, steel of the present invention has stable yield strength, under different rolling mill practices, various specifications steel plate
Tensile strength between 300-400MPa, and have very high elongation percentage.In composition design, production technology and performance
Better than comparison steel grade.So that steel of the present invention can be widely applied to the production of two-sided large deformation feran, and produce
Covering aluminum plate band has good punching performance and surface quality.
Claims (6)
1. it is a kind of adapt to large deformation and easy punching press cover aluminum substrate boron-containing steel, chemical component weight percentage is：C≤
0.01%, Si≤0.01%, Mn：0.05~0.15%, P≤0.012%, S≤0.006%, Al≤0.005%, N≤
0.005%, B：0.0005~0.002%, O：0.024~0.06%, remaining is Fe and inevitable impurity；And meet relationship
0.5≤B/ of formula (N-0.0025)≤1.0.
2. adapt to large deformation and easy punching press as described in claim 1 covers aluminum substrate boron-containing steel, which is characterized in that the steel
Microscopic structure be uniform isometric columnar ferrite+a small amount of bainite structure.
3. adapting to the high aluminium-coating surface substrate steel of large deformation and punch process as claimed in claim 1 or 2, feature exists
In 300~400MPa of tensile strength of the steel, elongation percentage is 40% or more.
4. adapting to the production method for covering aluminum substrate boron-containing steel of large deformation and easy punching press, feature as described in claim 1
It is, including,
1) it smelts
By ingredient described in claim 1 through molten iron pretreatment, converter top bottom blowing, external refining, be casting continuously to form slab；
2) slab reheats, 1200 DEG C of heating temperature or more；
3) controlled rolling
Using two sections of controlled rollings, 990 DEG C of roughing end temp or more, accumulative deflection >=80% of rough rolling step；Finish rolling enters
960 DEG C of temperature of mouth or more, 820~880 DEG C of finish rolling end temp；
4) control cooling, 10 DEG C/s or more of water cooling speed；
5) it batches, 550~600 DEG C of coiling temperature.
5. adapting to the production method for covering aluminum substrate boron-containing steel of large deformation and easy punching press, feature as claimed in claim 4
It is that the microscopic structure of the steel is uniform isometric columnar ferrite+a small amount of bainite structure.
6. adapting to the production method for covering aluminum substrate boron-containing steel of large deformation and easy punching press, feature as claimed in claim 4
It is that 300~400MPa of tensile strength of the steel, elongation percentage is 40% or more.
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| CN201710287418.9A CN108796382B (en) | 2017-04-27 | 2017-04-27 | Boron-containing steel suitable for large-deformation and easy-to-punch aluminum-coated substrate and production method thereof |
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| CN201710287418.9A CN108796382B (en) | 2017-04-27 | 2017-04-27 | Boron-containing steel suitable for large-deformation and easy-to-punch aluminum-coated substrate and production method thereof |
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| CN108796382B CN108796382B (en) | 2020-10-27 |
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