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 PDF

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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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steel plate
steel
molding
cooling
hot rolled
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CN104131238A (en
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张超
谭佳梅
陈良
钱龙
张永锟
梁文
刘先同
高智
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Group Corp
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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

High molding high durable Ultra-thin hot rolled steel plate and CSP production technology thereof
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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CN101235470A (en) * 2008-02-28 2008-08-06 武汉钢铁(集团)公司 Ultra-low carbon hot rolling weather-resisting steel with yield strength more than 450MPa
CN102839321B (en) * 2012-08-31 2014-08-20 武汉钢铁(集团)公司 Ultrathin hot-rolled sheet strip with yield strength more than or equal to 500MPa level and manufacturing method thereof

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