CN104131238B - High molding high durable Ultra-thin hot rolled steel plate and CSP production technology thereof - Google Patents
High molding high durable Ultra-thin hot rolled steel plate and CSP production technology thereof Download PDFInfo
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- CN104131238B CN104131238B CN201410307408.3A CN201410307408A CN104131238B CN 104131238 B CN104131238 B CN 104131238B CN 201410307408 A CN201410307408 A CN 201410307408A CN 104131238 B CN104131238 B CN 104131238B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 129
- 239000010959 steel Substances 0.000 title claims abstract description 129
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000000465 moulding Methods 0.000 title claims abstract description 18
- 238000005516 engineering process Methods 0.000 title claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000005096 rolling process Methods 0.000 claims abstract description 17
- 238000009749 continuous casting Methods 0.000 claims abstract description 15
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 14
- 229910052802 copper Inorganic materials 0.000 claims abstract description 12
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 11
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- 238000010079 rubber tapping Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000498 cooling water Substances 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims description 14
- 238000002791 soaking Methods 0.000 claims description 8
- 238000007670 refining Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 3
- 241001062472 Stokellia anisodon Species 0.000 claims description 2
- 230000000994 depressed Effects 0.000 claims 1
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 4
- 239000010936 titanium Substances 0.000 description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 239000010949 copper Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 239000011651 chromium Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 229910000529 magnetic ferrite Inorganic materials 0.000 description 9
- 239000011572 manganese Substances 0.000 description 9
- 229910000859 α-Fe Inorganic materials 0.000 description 9
- 206010011376 Crepitations Diseases 0.000 description 7
- 238000001556 precipitation Methods 0.000 description 7
- 210000003128 Head Anatomy 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 238000007792 addition Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- 238000005755 formation reaction Methods 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching Effects 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 229910000976 Electrical steel Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 238000011068 load Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 239000010731 rolling oil Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N tin hydride Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 210000001519 tissues Anatomy 0.000 description 2
- 208000003228 Foreign Body Diseases 0.000 description 1
- 206010070245 Foreign body Diseases 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 210000001331 Nose Anatomy 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 210000001215 Vagina Anatomy 0.000 description 1
- 229910000870 Weathering steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000011030 bottleneck Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910001568 polygonal ferrite Inorganic materials 0.000 description 1
- 230000001681 protective Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- -1 titanium iron Chemical compound 0.000 description 1
Abstract
The invention discloses a kind of high molding high durable Ultra-thin hot rolled steel plate and CSP production technology thereof, composition and the weight content of this steel plate are as follows: C:0.035～0.065%, Si:0.15～0.3%, Mn:1.3～1.6%, Cu:0.12～0.2%, Cr:0.2～0.6%, Ni:0.1～0.2%, Ti:0.1～0.13%, Mo:0.1～0.2%, Als:0.025～0.045%, P:0～0.018%, S:0～0.005%, N:0～0.006%, remaining is Fe and inevitable impurity；Controlling of production process converter smelting tapping P is 0～0.012%；Crystallizer hot-fluid is 2.45～2.55mw/m2, the specific water of continuous casting secondary cooling water is 1.77～1.83L/Kg, and opening and watering thickness of strand is 65～75mm, depresses to 55～60mm through repeatedly wick-containing；Strand tapping temperature is 1230～1250 DEG C；Finishing temperature is 880～920 DEG C；Batch after section cooling, use the head ladder type of cooling, batch and the most quickly cool down after being cooled to 280～320 DEG C with the cooling rate of≤10 DEG C/S after rolling off the production line.The thin specification steel plate prepared has high-mouldability while stable acquisition high intensity and high-weatherability.
Description
Technical field
The present invention relates to metallurgical technology, raw in particular to a kind of high molding high durable Ultra-thin hot rolled steel plate and CSP thereof
Production. art.
Background technology
Wuhan Iron and Steel Plant CSP production line is the sheet billet continuous casting and rolling production line of latest generation, and in heat run in March, 2009, this is raw
Produce line and include two 150 tons of converters, two LF refining furnaces, RH refining furnace, double fluid sheet blank continuous casting line, tunnel heating
With seven frame continuous hot-rolling mills.It is 1680mm that casting machine produces maximum strand width, and thickness is 70mm and 90mm two kinds, and this casting machine has
Band liquid center cast rolling function, 70mm thickness strand can draw to 70mm, the design work of casting machine to 52mm, 90mm thickness strand in casting in casting
Scooter 5～6m/min.The year design production capacity of whole production line hot-strip is 2,500,000 t, wherein, for hot rolling acid-cleaning galvanization roll
Be 54.2 ten thousand t, silicon steel stock roll 97.8 ten thousand t, hot rolling direct-furnish volume 980,000 t, the steel grade of production includes: carbon structural steels, quality carbon steel,
Hi-Stren steel, weatherproof structure steel, automobile structural steel, pipe line steel, ultra-low-carbon steel, non-orientation silicon steel and low-carbon cold rolling base material
With steel etc..To the end of the year 2009, Wuhan Iron and Steel Plant CSP line has been able to production and includes quality carbon steel, container steel, silicon steel, low-alloy high-strength
Ten several kinds such as steel, pipe line steel and low-carbon cold rolling base material steel.Compared with domestic and international similar sheet billet continuous casting and rolling production line,
Wuhan Iron and Steel Plant CSP line reach product level, reach product speed and quality control on have been realized in new breakthrough.
Producing line product competitiveness for improving CSP, develop high value added product, Wuhan Iron and Steel Plant CSP has carried out below thickness 2.0mm,
The production of the Thin Specs high-strength steel of yield strength 700Mpa rank, this portioned product belongs to high-strength thin material, is mainly used in special type
The high-strength thinning field such as case and vehicle etc. " with hot Dai Leng " and " with Bao Daihou ", current hot rolling produce line can production lot less, main
Rely on cold rolling.When CSP product line batching produces this high-strength thin material, because of the special shape of CSP conticaster funnel-type crystallizer, with
Time high-strength steel alloying element content high, formed product performance has much room for improvement；Rolling thin specification steel plate need to carry out wick-containing pressure, green shell
Being easily deformed, bleed-out risk is higher, reaches 40% when breakout ratio is the highest；It addition, at high-strength thinning field, the one-tenth of a lot of profiled members
Type is complex, pickling after means suitable post forming or molding, and the high-strength thin material that CSP early stage produces exists post forming and opens
Split or pickling problems of crack, seriously constrain CSP and produce exploitation and the propelling of this type of high value added product of line.
Summary of the invention
Present invention aim to provide a kind of high molding high durable Ultra-thin hot rolled steel plate and CSP thereof to produce work
Skill, this thin specification steel plate not only intensity is high, and mouldability and weather resistance are excellent, and this technique reduces CSP production line and produces
Continuous casting bleed-out rate during high-strength Thin Specs steel.
For achieving the above object, the technical solution used in the present invention is: a kind of high molding high durable Ultra-thin hot-rolled steel
Plate, chemical composition and the weight percent content thereof of this steel plate are as follows: C:0.035～0.065%, Si:0.15～0.3%, Mn:
1.3～1.6%, Cu:0.12～0.2%, Cr:0.2～0.6%, Ni:0.1～0.2%, Ti:0.1～0.13%, Mo:0.1～
0.2%, Als:0.025～0.045%, following control of element exists: P:0～0.018%, S:0～0.005%, N:0～
0.006%, remaining is Fe and inevitable impurity.
Further, chemical composition and the weight percent content thereof of this steel plate are as follows: C:0.035～0.065%, Si:
0.2～0.3%, Mn:1.3～1.6%, Cu:0.12～0.2%, Cr:0.3～0.5%, Ni:0.1～0.2%, Ti:0.1～
0.13%, Mo:0.1～0.2%, Als:0.025～0.045%, following control of element exists: P:0～0.018%, S:0～
0.005%, N:0～0.006%, remaining is Fe and inevitable impurity.
Further, chemical composition and the weight percent content thereof of this steel plate are as follows: C:0.035～0.05%, Si:
0.2～0.3%, Mn:1.3～1.5%, Cu:0.12～0.2%, Cr:0.3～0.4%, Ni:0.15～0.2%, Ti:0.1～
0.13%, Mo:0.1～0.2%, Als:0.03～0.045%, following control of element exists: P:0～0.01%, S:0～
0.005%, N:0～0.005%, remaining is Fe and inevitable impurity.
Further, described steel plate thickness is 1.2～2.0mm.
The production method of a kind of above-mentioned high molding high durable Ultra-thin hot-rolled steel, including converter smelting, external refining, company
Casting, soaking, roll and control cold step, described converter smelting, the weight percent content of the P that taps after controlling to smelt be 0～
0.012%；Described continuous casting, it is 2.45～2.55mw/m that crystallizer hot-fluid controls2, it is 1.77 that the specific water of continuous casting secondary cooling water controls
～1.83L/Kg, opening and watering thickness of strand is 65～75mm, depresses to 55～60mm through repeatedly wick-containing；Described soaking, controls casting
Base tapping temperature is 1230～1250 DEG C；Described rolling, controlling finishing temperature is 880～920 DEG C；Described control is cold, cold through laminar flow
Batch the most afterwards, use the head ladder type of cooling, batch after rolling off the production line with the cooling rate of≤10 DEG C/S slowly cool to 280～
After 320 DEG C, more quickly cool down.
Further, described casting process, controlling covering slag basicity is 1.0～1.15, and viscosity is 1.42～1.65Pa.s,
Fusing point is 1030～1100 DEG C.
Further, described control is cold, and controlling Strip Steel Coiling Temperature before head 0.8～1.2m is 650～670 DEG C, head
Controlling coiling temperature after 0.8～1.2m is 610～630 DEG C.
Further, described control is cold, batches after slowly cooling to 295～305 DEG C with the cooling rate of 5～8 DEG C/S after rolling off the production line,
The most quickly cool down.
Chemical composition with regard to the present invention is analyzed illustrating below:
C: CSP is produced for line, C content 0.07～0.17% scope belong to peritectic steel, and CSP produces line continuous casting funnel
Type crystallizer, causes bleed-out and crackle risk to be greatly increased when casting peritectic steel because of peritectic reaction, must keep away for this CSP flow process
Opening peritectic steel scope, C content must be at C≤0.07%, or C >=0.17%；C is relatively big to improving intensity effect, but C content is relatively
Gao Shi, the welding performance of steel is deteriorated, it is desirable to the strip steel of welding, phosphorus content is usually no more than 0.2%；It addition, C dramatically increases steel
Cold brittleness and aging sensitivity, therefore the present invention considers high durable and the high-mouldability energy of high-strength steel, and producing line feature in conjunction with CSP will
C content controls 0.035～0.065%.
Mn: manganese can improve band hardness of steel by solution strengthening, under certain content, moreover it is possible to improves the toughness of steel and wear-resisting
Property, but when Mn content is more than 1.3%, continuous casting billet solidification processing forms segregation, cause the formation of pearlite band, in steel
Mn content is the highest, and banded structure is the most obvious, binding tests result, and Mn content is controlled 1.3～1.6% by the present invention.
Si: can be dissolved in ferrite and austenite, increases intensity and the hardness of steel, but the Si of too high amount is easily at oxygen
Changing iron sheet and the interface segregation of matrix, affect the control of surface quality, therefore, Si content controls 0.15～0.3%.
P: in the ordinary course of things, phosphorus is harmful element in steel, increases the cold brittleness of steel, makes welding performance degenerate, and reduction is moulded
Property, making cold-bending property degenerate, therefore usually require that in steel, phosphorus content is less than 0.045%, high-quality steel requires some more low, in the present invention
Finding during request test, P is also easily and Ti element forms the titanium iron phosphide of fragility at crystal boundary, weakens crystal boundary toughness, it is easy to lead
Causing intergranular crack etc., therefore, the present invention, in view of the high-mouldability energy of high-strength steel, controls P≤0.018%.
S: sulfur is the most also harmful element, makes steel produce red brittleness, reduces ductility and the toughness of steel, in forging
Causing crackle when making and roll, sulfur is the most unfavorable to welding performance, reduces corrosion resistance, so usually requiring that sulfur content is less than
0.055%, high-quality steel requires less than 0.040%；In addition to above-mentioned impact, in steel of the present invention, S Yu Ti is during casting blank solidification
Forming Ti4C2S2 large inclusions, reduce the precipitation strength effect of Ti, meanwhile, S is easily formed Containing Sulfur with Mo on crystal boundary
The low melting point eutectic product of molybdenum, causes crystal boundary fragility, and this can reduce mechanical property and the serviceability of steel further, it is contemplated that
CSP produces line feature and the high-mouldability energy requirement of high-strength steel, and the present invention controls S≤0.005%.
Ti:Ti is a kind of very important microalloy element, adds a certain amount of Ti content in steel, on the one hand can subtract
While few C equivalent, by crystal grain refinement and precipitation strength effect, significantly improve the intensity of steel, on the other hand, can by O in steel,
The foreign bodys such as N, S are fixed up, and improve the weldability of steel, and reducing N affects the aging sensitivity of steel, Ti 0.02～
During 0.15% scope, its content increases the effect to precipitation strength and refined crystalline strengthening clearly；And in the present invention, Ti is except right
Outside intensity has an impact, it also has a prior effect, and because Mo can promote the formation of M/A island constituent element, and M/A island is with martensite
It is main hard phase constitution, forms micro-crack when deformation at Yi M/A island/basal body interface, and crackle is also easy to along M-A island/base
Body interface extends, thus the plasticity and toughness to steel plate has a negative impact, and Ti microalloying can suppress M/A constituent element effectively
Formation, Ti with Mo is combined simultaneously, also advantageously improves the resistant to hydrogen erosiveness of strip steel, and for these reasons, the present invention controls
Ti controls 0.10～0.13% scope.
Mo: the crystal grain of steel can be made to refine, improves the quenching degree of steel, and in the present patent application, the effect of Mo is mainly: 1) pass through
The quenching degree of Mo, in conjunction with cooling controlling and rolling controlling process, increases carbon diffusion activation energy in austenite, reduces Carbon diffusion coefficient, from
And strongly hinder precipitation and the growth process of pro-eutectoid ferrite, promote the shape of the acicular ferrite of high density dislocation substructure
Becoming, especially under deformation condition, the interpolation of Mo can effectively facilitate acicular ferrite and be formed, and to improving, obdurability is highly effective,
Acicular ferrite is had preferable high intensity and high tenacity coordinates, and has higher compatibility of deformation ability, is conducive to improving into
Type performance；2) molybdenum can also improve the effect that the resistant to hydrogen of steel corrodes, and is allowed to not produce spot corrosion, so that strip steel is through acid cleaning process
After, reduce the generation of defect, it is to avoid the appearance of formation of crack；3) when Mo content is more than 0.2%, because of the quenching degree that it is strong, cause
Finished strip tissue occurring, M/A island is greatly increased, increases the fragility of steel, cause being greatly increased of cracking during bending probability, in conjunction with
Forming requirements, Mo content is controlled the scope in 0.10～0.2% by the present invention.
Cu: by forming the protective rust of densification on the surface of steel, hence it is evident that improve the corrosion resisting property of steel, work collaborative with Cr
With, corrosion resisting property is improved further, and it is more universal that weathering steel adds these two kinds of elements, but, Cu Yu Cr increases the deformation of steel and resists
Power, when Cu content is higher simultaneously, easily produces copper brittleness phenomenon, makes the surface of steel produce be full of cracks, and the fragility and the surface that increase steel are opened
Split probability；Meanwhile, copper bearing steel produces the most viscous iron scale in stove, affects the surface quality of steel, and the present invention considers
Above-mentioned impact, requires and correlation test result in conjunction with corrosion resisting property, and controlling Cu content is 0.12～0.2% scope.
Cr: chromium can significantly improve the intensity of steel, hardness, wearability and quenching degree, but reduce plasticity and the toughness of steel simultaneously.
Cr Yu Cu synergism substantially increases the corrosion resisting property of steel, considers that Cr (increases high-strength steel to roll on the impact of steel resistance of deformation simultaneously
Load processed is obvious), binding tests result, controlling Cr content range is 0.2～0.6%.
Ni: nickel not only can improve intensity and the corrosion resisting property of steel, also can keep good plasticity and toughness, in the present invention
In, Ni, in addition to being improved anti-corrosion effect, also helps reduction copper brittleness phenomenon.Copper bearing steel in soaking pit high-temperature oxidation process,
Because rich Cu liquid phase is to the osmosis of matrix, the degree of depth of formation reaches the surface fine fisssure caused by oxide on surface of 10～15 μm
Stricture of vagina, causes high-strength steel to produce cracking phenomena in follow-up clod wash loading process.And add 0.1～0.2% Ni element after, carry
The fusing point of high copper-rich phase, weakens the infiltration that soaking pit high-temperature oxidation process liquid Cu is inside, reduces the generation of crizzle,
The surface quality of final products and processability will not be produced impact.
Als: have deoxidation, crystal grain thinning in steel, improves toughness and prevents the effect of timeliness, but Als too high levels shadow
Ringing the surface quality of steel, also increase cost, accordingly, it is 0.025～0.045% scope that the present invention controls Als content.
N: form thick TiN in steel with Ti during casting blank solidification, on the one hand reduces the precipitation strength effect of Ti
Really；On the other hand, the existence that TiN is mingled with bulky grain in steel, affect the processability of steel, significantly reduce the plasticity of steel；With
Time, there is timeliness effect in N, makes the hardness of steel and intensity raise, and solderability and cold brittleness increase, and belong to harmful unit in the present invention
Element, produces line traffic control level in conjunction with CSP, it is desirable to N≤0.006%.
Compared with prior art, the invention have the advantages that
One, the present invention passes through appropriate design steel grades so that it is finished product is organized as acicular ferrite+polygon ferrum element
Body, then coordinate low P, low S and low N to control, not only make high-strength steel sheet have high tenacity concurrently, and metallographic structure crystal grain is thin and equal
Even, steel excellent surface quality, it is thus achieved that excellent compatibility of deformation ability, thus improve the processability of steel plate.
Its two, the present invention plays the advantage of CSP abbreviated system, makes full use of the precipitation of Ti+Mo element
Strengthening and build up effect, it is ensured that mechanical property and processability, in conjunction with the addition of Cu+Cr+Ni weathering element, produce thickness
＜ 2.0mm is thick, the high molding high weather resistance steel of yield strength 700MPa rank；Utilize simultaneously and produce the spy that line temperature control precision is high
Point, it is to avoid containing the fluctuation on Ti Steel Properties, can meet complexity while the high intensity and high-weatherability of stable acquisition steel plate
Forming requirements, this high-strength thin material is the high value added product of function admirable, can be widely applied to " with hot Dai Leng " and " with thin generation
Thick " high-strength thinning application, such as: can be used for container, railcar, passenger vehicle and vehicle with high-strength thinning field.
Its three, present invention process, production process controls stable, and continuous casting bleed-out rate is reduced to less than 1%, solves restriction
CSP produces line and produces a big technical bottleneck of high-strength thin material.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of embodiment 3 steel plate.
Fig. 2 is the metallographic structure figure of comparative example steel plate.
Fig. 3 is the surface topography map of embodiment 3 steel plate.
Fig. 4 is the surface topography map of comparative example steel plate.
Fig. 5 is state diagram after embodiment 3 steel plate tubulation flattens.
Fig. 6 is state diagram after comparative example steel plate tubulation flattens.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, it is simple to more clearly understands the present invention, but it
The present invention is not constituted restriction.
Embodiment 1～7
Table 1 lists the change of Ti+Mo microalloying height molding high durable Ultra-thin steel plate in the embodiment of the present invention 1～7
Studying point and percetage by weight, surplus is Fe and inevitable impurity.
Table 1
In embodiment 1～7, application CSP technique produces above-mentioned high molding high durable Ultra-thin steel plate, and step is as follows:
1) converter smelting is carried out, P≤0.012% of tapping after smelting, preferably 0.01%；
2) after smelting, molten steel carries out external refining, is cast into base, the basicity of casting process covering slag at CSP conticaster subsequently
Controlling 1.0～1.15, viscosity controls at 1.42～1.65 pools. and the second, fusing point controls at 1030～1100 DEG C, it is ensured that crystallizer heat
Flow control is 2.45～2.55mw/m2, while controlling bleed-out, it is ensured that slab quality, continuous casting secondary cooling water intensity uses weak cold, than
Water rate control is in 1.77～1.83L/Kg scopes；Using the continuous casting process optimized, opening and watering thickness of strand is 70mm, through three not good liquors
Core depresses to 55～60mm, preferably 55mm；
3) after casting, slab entrance soaking pit carries out soaking, and controlling strand tapping temperature is 1230～1250 DEG C；
4) carrying out seven passage finish rolling after slab is come out of the stove after high pressure descaling, controlling finishing temperature is 880～920 DEG C, rolling
During, F2-6 frame comes into operation ROLLING OIL, and the ROLLING OIL dynamic development adjustment that comes into operation, according to roll wear and rolling load situation
Adjust ROLLING OIL and water ratio, it is ensured that the rolling stability of below 2.0mm Thin Specs high-strength steel in good time；After preventing thin material from going out F7
Nose, during the rolling of below 1.5mm thin material, the high-revolving F7 that comes into operation exports pressure zone blower fan, it is ensured that the stability of rolling；
5) batching after laminar flow, section cooling is leading portion cooling, for preventing thin material steel scrap, uses the cooling of head ladder
Mode, before head 0.8～1.2m, before preferably 1m, control coiling temperature is at 650～670 DEG C, after head 0.8～1.2m,
After preferably 1m, Strip Steel Coiling Temperature controls is 600～630 DEG C.
6) batch roll off the production line after with≤10 DEG C/S, after preferably the cooling rate of 5 DEG C/S slowly cools to 295～305 DEG C, preferably 300
The most quickly cool down after DEG C, stand-by.
In embodiment 1～7, the concrete value of related process parameters see table 2:
Table 2
Comparative example
The steel plate chemical composition that comparative example produces is: C:0.054%, Si:0.28%, Mn:1.65%, Ti:0.12%,
Mo: nothing, Als: nothing, Cu:0.15%, Cr:0.45%, Ni: nothing, P:0.021%, S:0.006%, N:0.0053%, additionally have
V:0.4%, remaining is Fe and inevitable impurity；This steel plate thickness is 1.5mm.
The production technology of Application Example 1～7 produces above-mentioned steel plate, and the concrete value of its related process parameters see table 3
(remaining technological parameter span is with embodiment 1～7):
Table 3
After testing, embodiment 1～7 and the performance parameter of comparative example gained steel plate see table 4:
Table 4
As can be seen from Table 4, embodiment 1～7 makes full use of precipitation strength and the build up effect of Ti+Mo element, knot
Closing the addition of Cu+Cr+Ni weathering element, then coordinate P, the content of S, N controls, it is ensured that mechanical property so that the steel of Thin Specs
Have high intensity and high tenacity concurrently；It addition, empirical tests, the steel plate that embodiment 1～7 prepares is respectively provided with the strongest corrosion resistance.
The metallurgical structure of the high molding high durable Ultra-thin steel plate that embodiment 3 is produced is shown in Fig. 1, the tissue of gained
Based on acicular ferrite structure, crystal grain is more uniform, and acicular ferrite has stronger compatibility of deformation ability, is conducive to improving steel
The processability of plate, it is to avoid cracking phenomenon；The metallurgical structure of the steel plate that comparative example produces is shown in Fig. 2, its metallographic structure
Structure is based on polygonal ferrite, and there is the ferrite crystal grain that part is thick.
The surface topography of embodiment 3 steel plate is shown in Fig. 3, its excellent surface quality, and micro-crack is not observed on steel surface；Comparative example
The surface topography of steel plate is shown in Fig. 4, and at its surface observation to the micro-crack up to 100 μm, the direction random distribution of crackle, surface is micro-
Crackle once produces, then, in Process of Cold-roll Forming, under alternate stress effect, crackle easily through-thickness extends, along with
The carrying out of forming process, crackle gradually extends appearance macroscopic view cracking phenomena.
Finally, the pipe fitting that the steel plate producing embodiment 3 prepares carries out flattening test, as it is shown in figure 5, its processability ten
Divide good, the most cracking phenomenon after flattening；Equally, the pipe fitting that the steel plate producing comparative example prepares carries out flattening test, as
Shown in Fig. 6, i.e. occur substantially ftractureing at the primary steel pipe of compacting.
Claims (6)
1. one kind high molding high durable Ultra-thin hot rolled steel plate, it is characterised in that: the chemical composition of this steel plate and weight hundred thereof
Proportion by subtraction content is as follows: C:0.035～0.065%, Si:0.15～0.3%, Mn:1.3～1.6%, Cu:0.12～0.2%, Cr:
0.2～0.6%, Ni:0.1～0.2%, Ti:0.1～0.13%, Mo:0.1～0.2%, Als:0.025～0.045%, below
Control of element exists: P:0～0.018%, S:0～0.005%, N:0～0.006%, and remaining is Fe and inevitable impurity；Should
The CSP production technology of steel plate, including converter smelting, external refining, continuous casting, soaking, rolls and controls cold step, described converter smelting
Refining, the weight percent content of the P that taps after controlling to smelt is 0～0.012%；Described continuous casting, it is 2.45 that crystallizer hot-fluid controls
～2.55mw/m2, it is 1.77～1.83L/Kg that the specific water of continuous casting secondary cooling water controls, and opening and watering thickness of strand is 65～75mm,
55～60mm are depressed to through repeatedly wick-containing；Described soaking, controlling strand tapping temperature is 1230～1250 DEG C；Described rolling, control
Finishing temperature processed is 880～920 DEG C；Described control is cold, batches after section cooling, uses the head ladder type of cooling, volume
After slowly cooling to 280～320 DEG C with the cooling rate of≤10 DEG C/S after taking off line, more quickly cool down.
High molding high durable Ultra-thin hot rolled steel plate the most according to claim 1, it is characterised in that: the chemistry of this steel plate
Composition and weight percent content thereof are as follows: C:0.035～0.065%, Si:0.2～0.3%, Mn:1.3～1.6%, Cu:
0.12～0.2%, Cr:0.3～0.5%, Ni:0.1～0.2%, Ti:0.1～0.13%, Mo:0.1～0.2%, Als:
0.025～0.045%, following control of element exists: P:0～0.018%, S:0～0.005%, N:0～0.006%, and remaining is Fe
And inevitable impurity.
High molding high durable Ultra-thin hot rolled steel plate the most according to claim 2, it is characterised in that: the chemistry of this steel plate
Composition and weight percent content thereof are as follows: C:0.035～0.05%, Si:0.2～0.3%, Mn:1.3～1.5%, Cu:
0.12～0.2%, Cr:0.3～0.4%, Ni:0.15～0.2%, Ti:0.1～0.13%, Mo:0.1～0.2%, Als:
0.03～0.045%, following control of element exists: P:0～0.01%, S:0～0.005%, N:0～0.005%, remaining be Fe and
Inevitably impurity.
High molding high durable Ultra-thin hot rolled steel plate the most according to any one of claim 1 to 3, it is characterised in that:
Described steel plate thickness is 1.2～2.0mm.
The highest molding high durable Ultra-thin hot rolled steel plate, it is characterised in that: described casting process,
Controlling covering slag basicity is 1.0～1.15, and viscosity is 1.42～1.65Pa.s, and fusing point is 1030～1100 DEG C.
The highest molding high durable Ultra-thin hot rolled steel plate, it is characterised in that: described control is cold, batches
After slowly cooling to 295～305 DEG C with the cooling rate of 5～8 DEG C/S after rolling off the production line, more quickly cool down.
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| CN104962811B (en) * | 2015-07-15 | 2017-06-20 | 东北大学 | A kind of twin-roll thin strip continuous casting fine grain orientation silicon steel thin made-up belt and its manufacture method |
| CN107186186A (en) * | 2017-04-27 | 2017-09-22 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of method that CSP conticasters pour into a mould weather resisting steel |
| CN111451290A (en) * | 2020-03-31 | 2020-07-28 | 鞍钢股份有限公司 | Production method for preventing thin strip steel head from being folded |
| CN114480972A (en) * | 2022-01-27 | 2022-05-13 | 马鞍山钢铁股份有限公司 | Thin-specification Ni-free weathering steel produced based on CSP process and production method thereof |
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| CN100419115C (en) * | 2006-11-23 | 2008-09-17 | 武汉钢铁(集团)公司 | Ultrahigh-strength atmospheric-corrosion resistant steel |
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