CN107779743A - Micro- carbon hot rolling acid-cleaning steel plate and its manufacture method with good deep drawability - Google Patents
Micro- carbon hot rolling acid-cleaning steel plate and its manufacture method with good deep drawability Download PDFInfo
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- 239000010959 steel Substances 0.000 title claims abstract description 107
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 106
- 238000005098 hot rolling Methods 0.000 title claims abstract description 56
- 238000004140 cleaning Methods 0.000 title claims abstract description 39
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 9
- 229910052796 boron Inorganic materials 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 26
- 238000005554 pickling Methods 0.000 claims description 13
- 238000009749 continuous casting Methods 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 229910001567 cementite Inorganic materials 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 14
- 238000004080 punching Methods 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 description 11
- 239000011572 manganese Substances 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 239000010936 titanium Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 229910000655 Killed steel Inorganic materials 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 229910001275 Niobium-titanium Inorganic materials 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- NJFMNPFATSYWHB-UHFFFAOYSA-N ac1l9hgr Chemical compound [Fe].[Fe] NJFMNPFATSYWHB-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
-
- 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
- C21D2211/003—Cementite
-
- 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
Landscapes
- 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 Sheet Steel (AREA)
Abstract
The present invention relates to micro- the carbon hot rolling acid-cleaning steel plate and its manufacture method with good deep drawability.Hot rolling acid-cleaning steel plate provided by the invention, its chemical component weight percentage are：C:0.006 0.020%, Si≤0.035%, Mn:0.10 0.20%, P≤0.018%, S≤0.010%, Ti:0.01 0.02%, B:0.0005 0.002%, N≤0.0050%, Al:0.020 0.055%, surplus is iron and is unavoidably mingled with.The yield strength Rp of steel plate of the present invention0.2For 165~225MPa, tensile strength Rm is 280~340MPa, elongation after fracture A50For 47~58%, yield tensile ratio is 0.58 0.69.Hot rolling acid-cleaning steel plate of the present invention is mainly used in making compressor of air conditioner lower house and the complicated such as clutch auto parts and components field of punching structure.
Description
Technical field
The present invention relates to a kind of hot rolling acid-cleaning steel plate, more particularly to a kind of micro- carbon hot rolling acid-cleaning with good deep drawability
Steel plate and its manufacture method, belong to technical field of iron-base alloy.
Background technology
For the higher steel plate of punching press requirement in the past typically using carbon aluminium-killed steel and ultra-low carbon cold-rolling steel.It is and traditional
Carbon aluminium-killed steel due to carbon content it is more, yield strength is high, and its cementite tissue is more, and plasticity is relatively low, during deep-draw
Easily cracking；It is IF steel (general C≤0.005%) for ultra-low-carbon steel, although yield strength is low, deep drawability is good, necessary
Using RH depth carbonization treatments, it is also necessary to it is higher to add alloy, the costs such as more niobium titanium.
With the fast development of the manufacturings such as current household electrical appliances, automobile and the keen competition of steel industry, using hot rolling acid
Wash deep drawing sheet steel and replace part cold-rolled steel sheet, it has also become and there may be powerful development trend；Because hot rolling acid-cleaning plate is because of surface matter
Measure, the technological process of production is short, and the ratio of performance to price is high, user to asked with advanced strategically important place the demand of acid-cleaning plate band with it is increasingly all
Increase；And for deep-draw acid-cleaning plate because its toughness plasticity is good, there are excellent deep-draw delay characteristics, be widely used in needing advanced strategically important place to ask
Or compressor of air conditioner and the auto parts and components field of punching structure complexity in terms of positive and negative punching press.
It is a kind of disclosed in Chinese patent literature CN102758128A patent to produce deep-draw level hot rolling with micro- carbon aluminum killed steel
The method of strip, its composition range use only micro- carbon aluminum killed steel traditional design, and by the performance test in this patent, it is bent
By force than higher, average reaches 0.762, and its elongation percentage is relatively low, average 44.8%, requires high steel plate for deep-draw, has
The risk of stamping cracking, it is unfavorable for deep-draw shaping.
It is a kind of disclosed in Chinese patent literature CN1978689A patent that there is low-carbon hot-rolled deep-drawing steel and its manufacturer
Method, its composition range are had any different in carbon, boron design with the design of this patent, its content be respectively 0.02-0.055%,
0.001-0.004%, and patent C content design is higher, though make tissue grain coarsening by adding B, but can be one
Determine to influence the overall toughness of its steel plate and deep drawing quality in degree.
A kind of Thin Specs hot rolling acid with good formability disclosed in Chinese patent literature CN102787270A patent
Steel and its production method are washed, C, SI, Mn element of high level are with the addition of in its composition range, content is respectively 0.04-
0.07%th, 0.1-0.3% and 0.41-0.60%, higher there is also intensity, mouldability is bad, while also adds higher SI and contain
Amount, it is unfavorable to acid-cleaning plate surface quality, therefore be also not suitable for making the high pickling parts product of deep-draw requirement.
The content of the invention
It is main it is an object of the present invention to provide a kind of micro- carbon hot rolling acid-cleaning steel plate and its manufacture method with good deep drawability
The hot rolling acid-cleaning steel plate yield tensile ratio that solves to be currently used for deep-draw processing is higher, elongation percentage is relatively low, punch process when easily ftracture
And because timeliness causes the technical problem of surface of steel plate cross break.
The present invention is by using suitable micro- carbon, the composition design of the resistance to timeliness of microalloying, the corresponding hot rolling of matching, acid
Technique is washed, obtained steel plate has suitable intensity, stable performance, a good deep drawing formability, higher surface quality,
Requirement of the high-end user to deep drawability is not only met, and improves market competitiveness of enterprises.
The technical solution adopted by the present invention is：A kind of micro- carbon hot rolling acid-cleaning steel plate with good deep drawability, its chemistry
Composition by weight percent is：C:0.006-0.020%, Si≤0.035%, Mn:0.10-0.20%, P≤0.018%, S≤
0.010%, Ti:0.01-0.02%, B:0.0005-0.002%, N≤0.0050%, Al:0.020-0.055%, surplus are iron
Be unavoidably mingled with.
It is ferrite+very small amount carburizing that the present invention, which has the metallographic structure of micro- carbon hot rolling acid-cleaning steel plate of good deep drawability,
Body, tissue grain size number are 6.5~8.0 grades, the yield strength Rp of hot rolling acid-cleaning steel plate0.2It is strong for 165~225MPa, tension
Degree Rm is 280~340MPa, elongation after fracture A50For 47~58%, yield tensile ratio 0.58-0.69.
Hot rolling acid-cleaning steel plate of the present invention meets the users such as high-end household electrical appliances or automobile and is carrying out parts deep-draw or positive recoil
The requirement of pressure, be not in problems of crack in process.
The chemical composition of micro- carbon hot rolling acid-cleaning steel plate of the present invention with good deep drawability is limited to above-mentioned model
It is as follows to enclose the reasons why interior：
Carbon：In mild steel, the mechanical performance of steel plate is influenceed obvious by carbon；With the reduction of carbon content, armor plate strength
It can reduce, plasticity is obviously improved, but carbon content is too low (≤0.005%), RH stoves decarburization time length, increases cost；Such as carbon content
It is too high that intensity can be caused too high, more thick brittle carbide particle can be formed in steel, it is unfavorable to plasticity and toughness, simultaneously
Forming property can be caused drastically to deteriorate.Therefore, the carbon content scope of the present invention needs strict limitation, the carbon content set as
0.006%~0.020%.
Silicon：Silicon, which is solid-solubilized in, certain reinforcing effect in steel matrix, while contains appropriate silicon to de- in steel during melting
Oxygen, desulfurization are favourable；But the present invention must control silicone content, when silicone content is higher, the plasticity of steel is not only influenceed, can also be in heat
Roll plate surface and form serious Fe2O3, in follow-up acid cleaning process being difficult to pickling eliminates, and the surface quality of acid-cleaning plate is influenceed, to rear
Continuous user's processing such as japanning processing is unfavorable.Present invention control Si≤0.035%.
Manganese：Manganese is the essential element of solution strengthening, for low-intensity deep-draw steel, manganese content it is lower to deep drawability more
Favorably；And be advantageous to desulfurization containing appropriate manganese, therefore low manganese content is used in low-intensity deep punching steel, but must be fulfilled for and sulphur
Ratio, hot worked hot-short phenomenon is avoided, i.e. Mn/S values control is more than 10.Invention limits Mn contents as 0.10%
~0.20%.
Sulphur and phosphorus：Sulphur, phosphorus are the harmful elements in steel, and sulphur can form sulphide inculsion in steel, make its ductility and tough
Property reduce, and the anisotropy of steel can be aggravated；Phosphorus easily in cyrystal boundary segregation, reduces crystal boundary adhesion, deteriorates the cold-workability of steel,
Therefore should try one's best the content for reducing them in steel；Therefore, the present invention limits S≤0.010%, P≤0.018%.
Titanium：The present invention carries out microalloying further to reduce the content of the solid solution carbon nitrogen in steel by using titanium, and reduction is oozed
Carbon body quantity, improve the elongation percentage and aging resistance energy of steel plate, so as to improve deep drawability, titanium not only cost compare it is relatively low,
The form of sulfide can also be changed, improve the cold-forming property of steel.The present invention limits Ti contents as 0.01%~0.02%.
Boron：Micro boron is added in the present invention, and ferritic precipitation can be delayed namely to reduce ferritic forming core
Speed, thicker crystallite dimension is can obtain, improve the plasticity of steel plate, improve the cold forming capability of steel plate；Admittedly the ability of N simultaneously
Significantly larger than Ti and Al, it can prevent and mitigate the generation of timeliness；And B element is added, can suitably reduce A3The temperature of transformation temperature
Degree.The present invention limits B content as 0.0005~0.002%.
Nitrogen：Nitrogen belongs to harmful element in the steel of the present invention, and nitrogen can seriously reduce the plasticity and toughness of material, and to timeliness
Very sensitive, unfavorable steel plate is in follow-up uncoiling and the processing of shaping, it is therefore desirable to limits nitrogen content.Present invention restriction N≤
0.0050%.
Aluminium：Aluminium is as strong deoxidier, and oxygen forms Al in steel2O3Removed in steel-making；And the adhesion with N is very strong,
The AlN of compound state is formed, so as to change the strain-aging of steel.But aluminium is too high to form excessive Al2O3It is mingled with, and even
Casting cast is easy blocking sprue gate.The present invention limits Al content as 0.020%~0.055%.
A kind of manufacture method of micro- carbon hot rolling acid-cleaning steel plate with good deep drawability, this method include：
Molten steel obtains continuous casting steel billet through continuous casting, wherein the percentage by weight of the ladle chemistry is：C:0.006-
0.020%, Si≤0.035%, Mn:0.10-0.20%, P≤0.018%, S≤0.010%, Ti:0.01-0.02%, B:
0.0005-0.002%, N≤0.0050%, Al:0.020-0.055%, surplus are iron and are unavoidably mingled with；
Continuous casting steel billet carries out hot rolling after being heated to 1160~1200 DEG C, described hot rolling is two-part rolling mill practice, roughing
For 5 passage tandem rollings, roughing end temp is 960~1020 DEG C, and hot-rolled intermediate billet thickness >=42mm, finish rolling is 7 passage tandem rollings,
Austenite one phase area rolls, and finish rolling end temp is 880 DEG C~930 DEG C, finish rolling reduction ratio >=84%, after finish rolling, steel plate thickness
For 2.5mm~7mm, section cooling is cooled down using leading portion, and coiling temperature batches to obtain coils of hot-rolled steel when being 580 DEG C~620 DEG C；
Coils of hot-rolled steel is being provided with and uncoiling again on the uncoiler for the anti-crease rollers that come into operation, and through straightening, pickling, batches to obtain finished product
Pickled plate, described straightening elongation percentage are 0.6%~1.2%.
The manufacturing process system reason that the present invention takes is as follows：
1st, the setting of continuous casting steel billet heating-up temperature
If slab heating temperature is too high, steel slab surface can generate more iron scale, in subsequent hot rolling roughing, essence
Belt steel surface is easily pressed into during rolling, forms surface defect；As heating-up temperature is too low, then it can not ensure finishing temperature and rolling
Stability.Slab heating temperature of the present invention is set as 1160 DEG C~1200 DEG C.
2nd, roughing end temp and workpiece thickness setting
Roughing end temp equally influences surface of steel plate iron scale, and roughing end temp is too high, is easily formed excessively
Secondary oxidation iron iron sheet, finishing stands are not easy to remove, and can form scenery with hills and waters shape scale defect in surface of steel plate after pickling, influence
Surface of steel plate and the use of user.Roughing end temp of the present invention is set as 960 DEG C~1020 DEG C.
Workpiece thickness influences steel plate finishing temperature, particularly steel plate edge finishing temperature, if workpiece thickness is too low,
Made-up belt temperature drop is excessive, causes follow-up finishing temperature to reduce, and particularly steel plate edge temperature drop is very big, and steel plate edge is in austenite
+ ferrite two-phase section rolls, and causes the drastically deterioration of forming property.Present invention setting workpiece thickness >=42mm.
3rd, finish rolling end temp is set
The finishing stands of the present invention need to roll in austenite one phase area, if final rolling temperature is too low, finishing stands are in iron element
Body+austenite two-phase section rolling, then can form the hot rolling texture for being unfavorable for Pressing Deformation, the processability index of steel plate is such as prolonged
Stretch rate etc. to drastically reduce, particularly steel plate anisotropy aggravates, and causes steel plate to ftracture in Pressing Deformation.Finish rolling end temp mistake
Height, then surface of steel plate iron scale is serious, is not easy to remove during pickling.Through the testing of materials and calculating, material phase transformation point A of the present invention3
Equilibrium state transition temperature is at 875 DEG C or so；Finish rolling end temp of the present invention is set as 880 DEG C~930 DEG C.
4th, the setting of hot-rolling coiling temperature
Hot-rolling coiling temperature is too high, then terminates in finish rolling to batching in this period the increase of surface of steel plate iron scale thickness
Substantially, follow-up pickling is influenceed.As hot-rolling coiling temperature is too low, armor plate strength increase, elongation declines, and to mouldability also not
Profit.Appropriate low coiling temperature is advantageous to preserve the dislocation that distorts caused by hot rolling in steel plate, and dislocation can fix free state
C, N atoms, thus it is favourable for eliminating discontinuous yielding phenomenon.The coiling temperature scope that the present invention is set is 580 DEG C~620
℃。
5th, pickling uncoiling and straightening technique determine
Pickling uncoiling of the present invention and straightening technique have considerable influence to the surface quality for improving steel plate.Come into operation during uncoiling wrinkle resistant
Roller, by the pressure influence of the anti-crease rollers contacted therewith, i.e. the plastic deformation of belt steel surface is that having for the deformation of belt steel surface
Carried out under boundary condition, the plastic deformation of belt steel surface will not be shown obvious compared with uniformly, deformation point is more under free state
Cross breaks defect.
The present invention uses straightening technique in pickling, on the one hand straightening can first carry out machinery before steel plate enters descaling bath
Scale breading, be advantageous to improve the efficiency of follow-up pickling.On the other hand by straightening, the surrender that can eliminate steel plate stretching curve is put down
Platform, but straightening rate is too high, steel plate processing hardening is serious, and elongation and forming property can reduce.The straightening extension of the present invention
Rate is set as 0.6%~1.2%.
The inventive method production micro- carbon hot rolling acid-cleaning steel plate with good deep drawability metallographic structure be ferrite+
Very small amount cementite, tissue grain size number are 6.5~8.0 grades, the yield strength Rp of hot rolling acid-cleaning steel plate0.2For 165~
225MPa, tensile strength Rm are 280~340MPa, elongation after fracture A50For 47~58%, yield tensile ratio 0.58-0.69.
The present invention has following good effect compared with prior art：1st, the present invention by micro- carbon, containing TI and add B into setting up separately
Meter and hot rolling, acid cleaning process carry out the design that matches, and have obtained a kind of hot rolling acid-cleaning steel plate with good deep-draw requirement, solve
The hot rolling acid-cleaning plate of prior art production is used for the problems such as easily cracking when deep-draw requirement or positive and negative punching press, surface after shaping
There is the problems such as cross breaks defect.2nd, present component and it is by suitable composition design, heating of plate blank temperature the characteristics of technique
Degree, hot rolling roughing end temp, workpiece thickness, hot rolling finishing temperature, hot-rolling coiling temperature, hot rolling acid-cleaning uncoiling and straightening work
Skill, obtaining one kind has suitable strength range, low yield strength ratio and compared with the favorable forming property index such as high-elongation, and has
Good aging resistance can be with the preferable hot rolling acid-cleaning plate of surface quality.
Brief description of the drawings
Fig. 1 is the metallographic structure photo of hot rolling acid-cleaning steel plate embodiment 1 of the present invention.
Embodiment
Below by embodiment 1~4, the invention will be further described.
Table 1 is the chemical composition (by weight percentage) of steel of the embodiment of the present invention, and surplus is iron and inevitable impurity.
The chemical composition of the steel of the embodiment of the present invention of table 1, unit：Percentage by weight.
The requirement designed according to material composition of the present invention, using the qualified molten steel of converter top bottom blowing composition, molten steel
Pass through successively：The heating treatment of LF stoves simultaneously ensures that bottom blowing Ar mixings time are more than 5 minutes, and RH stoves carry out vacuum circulation degassing processing, protect
Demonstrate,prove the pure degassing times of RH to be more than 8 minutes, molten steel blows Ar protection direct castings through whole process and obtains continuous casting steel billet, and continuous casting steel billet thickness is
210~230mm, width are 900~1600mm, and length is 8500~11000mm.
The scale slab of STEELMAKING PRODUCTION delivers to heating furnace reheating, and hot tandem rolling is delivered to after de-scaling of coming out of the stove.Pass through
Roughing and finish rolling Continuous mill train controlled rolling, are batched after section cooling, and laminar flow is cooled down using leading portion, the qualified hot rolling of output
Coil of strip, the thickness of hot rolled steel plate is 2.5~7.0mm.Hot rolling main technique control parameter is shown in Table 2.
The hot rolling technology control parameter of the embodiment of the present invention of table 2
Coils of hot-rolled steel is being provided with and uncoiling again on the uncoiler for the anti-crease rollers that come into operation, and through straightening, pickling, batches to obtain finished product
Pickled plate, described straightening elongation percentage are 0.6%~1.2%.Straightening elongation percentage of the embodiment of the present invention is shown in Table 3.
The straightening elongation percentage of the embodiment of the present invention of table 3
The micro- carbon hot rolling acid-cleaning steel plate with good deep drawability obtained using the above method, referring to Fig. 1, hot rolling acid-cleaning
The metallographic structure of steel plate is ferrite+very small amount cementite, and tissue grain size number is 6.5~8.0 grades, yield strength Rp0.2For
165~225MPa, tensile strength Rm are 280~340MPa, elongation after fracture A50For 47~58%, yield tensile ratio 0.58-0.69.
By the obtained hot rolling acid-cleaning steel plate of the present invention according to《GB/T228.1-2010 metal material stretching test part 1s：
Room temperature test method》Tension test is carried out, the mechanical property of hot rolling acid-cleaning steel plate is shown in Table 4.
The mechanical property of the hot rolling acid-cleaning steel plate of the embodiment of the present invention of table 4
| Performance indications | Yield strength Rp0.2/MPa | Tensile strength Rm/MPa | Elongation after fracture A50/ % | Yield tensile ratio |
| The present invention | 165-225 | 280-340 | 47-58 | 0.58-0.69 |
| Embodiment 1 | 195 | 314 | 48.5 | 0.621 |
| Embodiment 2 | 166 | 281 | 57.5 | 0.590 |
| Embodiment 3 | 223 | 331 | 52.5 | 0.674 |
| Embodiment 4 | 190 | 307 | 53.4 | 0.619 |
It was found from the performance of table 4, hot rolling acid-cleaning plate of the present invention have suitable strength range, relatively low yield tensile ratio and compared with
The good forming property index such as high-elongation, meeting the pickling users such as high-end household electrical appliances or automobile will in progress parts deep-draw
Ask or the requirement of positive and negative punching press.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
Into technical scheme, all fall within the protection domains of application claims.
Claims (4)
1. a kind of micro- carbon hot rolling acid-cleaning steel plate with good deep drawability, its chemical component weight percentage are：C:0.006-
0.020%, Si≤0.035%, Mn:0.10-0.20%, P≤0.018%, S≤0.010%, Ti:0.01-0.02%, B:
0.0005-0.002%, N≤0.0050%, Al:0.020-0.055%, surplus are iron and are unavoidably mingled with；The hot rolling acid
The metallographic structure for washing steel plate is ferrite+very small amount cementite, and the grain size number of the tissue is 6.5~8.0 grades.
2. there is micro- carbon hot rolling acid-cleaning steel plate of good deep drawability, its 2.5~7.0mm thickness hot rolling as claimed in claim 1
The yield strength Rp of pickled plate0.2For 165~225MPa, tensile strength Rm is 280~340MPa, elongation after fracture A50For 47
~58%, yield tensile ratio 0.58-0.69.
3. a kind of manufacture method of micro- carbon hot rolling acid-cleaning steel plate with good deep drawability, it is characterized in that, described method bag
Include：
Molten steel obtains continuous casting steel billet through continuous casting, wherein the percentage by weight of the ladle chemistry is：C:0.006-
0.020%, Si≤0.035%, Mn:0.10-0.20%, P≤0.018%, S≤0.010%, Ti:0.01-0.02%, B:
0.0005-0.002%, N≤0.0050%, Al:0.020-0.055%, surplus are iron and are unavoidably mingled with；
Continuous casting steel billet carries out hot rolling after being heated to 1160~1200 DEG C, described hot rolling is two-part rolling mill practice, and roughing is 5
Secondary tandem rolling, roughing end temp are 960~1020 DEG C, and hot-rolled intermediate billet thickness >=42mm, finish rolling is 7 passage tandem rollings, in Ovshinsky
Body monophase field rolls, and finish rolling end temp is 880 DEG C~930 DEG C, finish rolling reduction ratio >=84%, before section cooling uses after finish rolling
Section cooling, coiling temperature batch to obtain coils of hot-rolled steel when being 580 DEG C~620 DEG C；
Coils of hot-rolled steel is being provided with and uncoiling again on the uncoiler for the anti-crease rollers that come into operation, and through straightening, pickling, batches to obtain finished product acid-washing
Steel plate, described straightening elongation percentage are 0.6%~1.2%.
4. the manufacture method of micro- carbon hot rolling acid-cleaning steel plate with good deep drawability as claimed in claim 3, it is characterized in that,
After hot fine rolling, the thickness for controlling hot rolled steel plate is 2.5~7.0mm.
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