CN107419177A - Tensile strength for automobile is the hot rolling acid-cleaning steel and its manufacture method of 540MPa levels - Google Patents
Tensile strength for automobile is the hot rolling acid-cleaning steel and its manufacture method of 540MPa levels Download PDFInfo
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- CN107419177A CN107419177A CN201710668053.4A CN201710668053A CN107419177A CN 107419177 A CN107419177 A CN 107419177A CN 201710668053 A CN201710668053 A CN 201710668053A CN 107419177 A CN107419177 A CN 107419177A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0242—Flattening; Dressing; Flexing
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- 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
- C21D2211/009—Pearlite
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Abstract
The invention discloses the hot rolling acid-cleaning steel and its manufacture method that a kind of tensile strength for automobile is 540MPa levels, the percetage by weight of its chemical composition is：C：0.050~0.070%, Si：0.050~0.150%, Mn：1.100~1.350%, P≤0.020%, S≤0.006, Nb：0.037~0.047%, Als：0.025~0.055%, Cu≤0.300%, Ni≤0.300%, Cr≤0.300%；Remaining is Fe and inevitable impurity.This method by desulfurizing iron, converter smelting, application of vacuum/Argon and ladle furnace, continuous casting, shaping, heating of plate blank, hot continuous rolling, section cooling, batch, finishing, acid cleaning process, it is smooth, batch, rush volume, oiling and packaging manufacture obtain hot rolling acid-cleaning steel, hot rolling acid-cleaning steel of the invention has the characteristics of good ductility, cold stamping forming property, welding performance and cold-bending property are good.
Description
Technical field
The present invention relates to a kind of manufacture method of steel plate, is 540MPa levels in particular to a kind of tensile strength for automobile
Hot rolling acid-cleaning steel and its manufacture method.
Background technology
With the overall superfluous continuous aggravation of steel and iron industry production capacity, low cost manufacture product is increasingly by steel industry
Pay attention to；And another aspect auto industry is developing rapidly, the demand of automobile steel is increasing, and the competition of industry is also increasingly
Fierceness, therefore the control to material cost is with regard to most important.The current situation of steel and iron industry and auto industry, is further promoted
The application and development of automobile using hot rolling acid-cleaning steel.
Automobile using hot rolling acid-cleaning steel thickness is typically in 2.0~6.0mm scope, it is desirable to great surface quality, to meet vapour
Strict standard of the car to ferrous materials, it is desirable to must not have bubble, crackle on the surface of strip, scab, fold and be mingled with etc. to making
With it is harmful the defects of, the defects of must not also having more than half influence strip forming property of belt steel thickness tolerance, for example scratch, pressure
The defects of trace, pit, roll marks.Automobile using hot rolling acid-cleaning steel primary crossbeam being used in chassis system, auxiliary girder, preceding in passenger car
Bridge, back axle；Wheel hub, spoke in wheel system；Structural member and safety member in bodywork system；Force structure in seat system
Part and safety member, amount to a passenger car pickling steel dosage about 100kg.And driver's cabin safety knot component, the compartment bottom of commercial car
Plate etc. all uses hot rolling acid-cleaning Steel material, amounts to a commercial car pickling steel dosage about 16kg.
The characteristics of automobile using hot rolling acid-cleaning steel, is as follows：Compared with the general plate of hot rolling, automobile using hot rolling acid-cleaning steel has following
Advantage：First, great surface quality, because eliminating the iron scale of belt steel surface, strip surface quality is improved, and is improved
The welding performance and paintability of material, and the appearance of strip is significantly improved, it is preferable automobile structure material；Two
It is high dimensional accuracy, after the flattened technique of automobile using hot rolling acid-cleaning steel, its template is optimized, so as to reduce strip profile and flatness
The defects of poor.Compared with cold rolling plate, on the premise of strip surface quality requirement is ensured, automobile using hot rolling acid-cleaning steel
" it can be steel mill's reduction production cost with hot Dai Leng ", be that user reduces purchase cost.
At home and abroad some large iron and steel enterprises possess the continous way hot rolling acid-cleaning steel production line of specialty, and some steels are looked forward to
Industry only possesses plug-type hot rolling acid-cleaning steel production line, and What is more, and some enterprises do not have hot rolling acid-cleaning steel production line, can only entrust outside
Produce hot rolling acid-cleaning steel.Continous way hot rolling acid-cleaning steel production line production automobile using hot rolling acid-cleaning steel quality is guaranteed, but equipment
Input cost is too high；Although plug-type hot rolling acid-cleaning steel production line reduces with outer committee's production hot rolling acid-cleaning steel cost, quality
It cannot ensure, especially production has the automobile using hot rolling acid-cleaning steel of great surface quality requirement.It is insufficient instant invention overcomes these,
The production capacity more than needed that on-line production line is rolled using cold rolling acid produces automobile using hot rolling acid-cleaning steel, has both met automobile using hot rolling acid-cleaning steel
High surface requirements, also create economic benefit.
Through preliminary search, Chinese Patent Application No. CN201210298259.X discloses a kind of thickness≤1.8mm automobile usings
The production method of Thin Specs hot rolling acid-cleaning steel, belongs to Thin Specs CSP technique productions field, and the chemical composition of Thin Specs pickling steel is pressed
Percetage by weight content is：C：0.04~0.07%, Si：0.10~0.30%, Mn：0.60~1.30%, P≤0.025%, S
≤ 0.012%, Ti：0.02~0.04%, Als：0.010~0.030%；Sheet billet production thickness≤1.8mm, tensile strength >=
400MPa.Production stage：Desulfurizing iron, stove smelts and Alloying Treatment；Ladle furnace processing；Continuous casting and rolling；Water under high pressure dephosphorization, pressure
Power is controlled in 25~35MPa；Controlled rolling, section cooling, batch, be pickling, smooth, controlling smooth elongation percentage to be no more than 2%；Essence
It is whole, using Electrostatic greasing.It is high that Chinese Patent Application No. CN201310731354.9 discloses a kind of 380MPa levels one side enamel
Intensity deep-draw hot rolling acid-cleaning steel plate, belongs to glassed steel production field, and its chemical composition mass percent is：Mn 0.35-
0.65%th, Als 0.015-0.045%, Ti：0.030-0.060%, S：0.008-0.016%, C≤0.018%, Si≤
0.05%th, P≤0.020%, N≤0.006%.Yield strength >=380MP of the steel of example steel, elongation percentage more than 35%,
Not yet retrieve and tensile strength 540MPa level great surface quality automobile using hot rolling acid-cleaning steel and manufacture method at present
Mutually identical documents and materials.
The content of the invention
An object of the present disclosure is the hot rolling acid-cleaning steel defect for no tensile strength 540MPa level great surface qualities, is carried
The hot rolling acid-cleaning steel that a kind of tensile strength for automobile is 540MPa levels is supplied, under pickling state, the steel plate has high table
Face quality, uniform tiny grain structure, good stamping formabilily and welding performance.This steel plate is mainly used in vapour
Bodywork system, chassis system, wheel system, some structural members in seat system and driver's cabin inner panel of car etc..
Second purpose of the invention is the technical requirements for China's automobile using hot rolling acid-cleaning steel, in unprofessional hot rolling acid-cleaning
In the case of steel production line, there is provided a kind of tensile strength for automobile is the manufacturer of the hot rolling acid-cleaning steel of 540MPa levels
Method, this method rolled using the acid of cold rolling producing line it is online, by aligning, straightening, pickling, rinsing, drying, smooth, finishing oiling etc.
Technique, it have developed the 540MPa level automobile structure hot rolling acid-cleaning steel with great surface quality and excellent performance.
Scale on surface removes clean, and flattening process is carried out using the 5th frame of five frames, make roughness control 0.6~
1.2 μm, meet requirement of the Automobile Parts to material surface, meanwhile, plate shape is excellent, has good forming property, can portion
Divide and substitute the materials such as cold rolling low-alloy steel.
To realize above-mentioned first purpose, a kind of tensile strength for automobile provided by the invention is the hot rolling of 540MPa levels
Pickling steel, the percetage by weight of the hot rolling acid-cleaning steel chemical composition are：C：0.050~0.070%, Si：0.050~
0.150%th, Mn：1.100~1.350%, P≤0.020%, S≤0.006, Nb：0.037~0.047%, Als：0.025~
0.055%th, Cu≤0.300%, Ni≤0.300%, Cr≤0.300%；Remaining is Fe and inevitable impurity.
Further, the percetage by weight of the hot rolling acid-cleaning steel chemical composition is：
C：0.050~0.060%, Si：0.075~0.125%, Mn：1.125~1.325%, P≤0.020%, S≤
0.005%th, Nb：0.038~0.045%, Als：0.030~0.040%, Cu≤0.150%, Ni≤0.150%, Cr≤
0.150%；Remaining is Fe and inevitable impurity.
Yet further, the percetage by weight of the hot rolling acid-cleaning steel chemical composition is：
C：0.56%th, Si：0.094%th, Mn：1.260%th, P：0.008%th, S：0.004%th, Nb：0.042%th, Als：
0.035%th, Cu：0.010%th, Ni：0.005%th, Cr：0.012%；Remaining is Fe and inevitable impurity.
Yet further, the hot rolling acid-cleaning steel lower yield strength ReL：355~435MPa；Tensile strength Rm：540~
650MPa；Elongation A：21~31%；Wide clod wash (b=35mm) is functional (d=1.5a).
The effect of above-mentioned element and advantage illustrate：
Carbon is intensified element most economical in mild steel, but too high levels reduce the plasticity and impact flexibility of steel,
Deteriorate cold formability and welding performance.The increase of carbon equivalent also reduces the qualification rate of the cold-bending property of steel plate.Therefore need
On the premise of proof strength, the content of reduction carbon as far as possible.So according to be actually needed its content is limited to 0.050~
0.070% scope.
Silicon is cheap and effective deoxygenation of liquid steel element.But its content can then deteriorate hot rolled steel plate more than 0.300%
Surface quality, and then the surface quality of pickling steel is influenceed, it is particularly disadvantageous for great surface quality automobile using hot rolling acid-cleaning steel.Institute
So that its content is limited into 0.050~0.150% scope.
Manganese is to improve intensity and the maximally effective element of toughness, manganese to expand austenitic area, can improve intensity-extension of steel
Balance.But too high Mn contents can produce serious influence to the ductility and impact property of steel.In consideration of it, by its content
It is limited to 1.100~1.350% scopes.
Phosphorus is the element for the intensity that can improve steel, but is reduction of the plasticity of steel, also unfavorable to welding performance, and increases
The sensitiveness of weld cracking, therefore, it is a kind of harmful element in automobile using hot rolling acid-cleaning steel, phosphorus should be reduced as far as possible in steel
In content.And phosphorus easily causes center segregation of casting blank, cause cold bending performance, toughness to deteriorate, therefore, set its content
The upper limit is 0.020%.
Sulphur is very harmful element.Sulphur in steel is mainly present in steel in the form of (Mn, Fe) S is mingled with, this sulphur
It is anisotropy that is very unfavorable, and causing plate property that compound, which is mingled with the impact flexibility to steel, cold-bending property, plasticity etc.,
Therefore, sulfur content in steel need to be controlled more low better.Based on the consideration to steel plate cold bending forming technology and manufacturing cost, plan
Sulfur content control is below 0.006% in steel.
Aluminium adds for deoxidation, when Als contents are less than 0.010%, it is impossible to play its effect；On the other hand,
Aluminium influences the welding performance of steel, and the aluminium for adding volume easily forms aluminum oxide agglomerate.Therefore, Als contents be limited to 0.015~
0.045% scope.
Niobium is indispensable element in non-recrystallization controlled rolling, crystal grain thinning, reduction Ovshinsky in thermomechanical processing
Body adds trace alloying element niobium to ferritic transition temperature and precipitation strength, therefore in steel can be easy to entering for controlled rolling
OK, the intensity and toughness of steel plate are improved and.So the consideration of comprehensive mechanical property of steel plate and cost etc., its content is limited
It is scheduled on 0.037~0.047% scope.
To realize above-mentioned second purpose, there is provided a kind of above-mentioned heat with great surface quality and tensile strength 490MPa levels
Roll the manufacture method of pickling steel, this method passes through desulfurizing iron, converter smelting, application of vacuum/Argon and ladle furnace, continuous casting, whole
Shape, heating of plate blank, hot continuous rolling, section cooling, batch, finishing, acid cleaning process, it is smooth, batch, rush volume, oiling and packaging manufacture
Hot rolling acid-cleaning steel is obtained,
1) in Hot Strip Rolling, heating-up temperature is 1270~1310 DEG C, and roughing outlet temperature is 1090~1130 DEG C, finish to gauge
Temperature is 840~880 DEG C, and coiling temperature is 560~600 DEG C,
2) section cooling mode：Leading portion cools down, 35 DEG C of coolant water temperature ＜, cooling velocity：30~110 DEG C/s
Send and ensure that the technology of great surface quality automobile using hot rolling acid-cleaning steel is closed under unit is smooth again after hot continuous rolling batches
Key point.Flattening process is on the one hand to the institutional framework for adjusting hot rolling raw material, eliminates the yield point elongation of material, improves material
Mechanical property, be on the other hand to improve the strip shape quality of material, prerequisite improved to obtain good pickling quality；
3) to be steel roll the process of online production to acid cleaning process in acid, including uncoiling, aligning, cutting head cutting tail, welding, straightening,
Pickling (adding corrosion inhibiter), rinsing (adding corrosion inhibiter), drying, cutting edge, wherein,
Align process：The crooked position of steel is born sizable direction bending or stretching, produce the position certain
Elastic-plastic deformation, after external force removes, steel recover by elasticity, then reach straight, simultaneously because surface of steel plate iron oxide
Skin different plasticity, come off during the straightening deformation repeatedly of aligning, so as to reach the effect of dephosphorization.
Straightening process：First, improving plate shape, by making strip stretch and after carrying out bending straightening, can partially remove
Shape wave and C-shaped bending, the L-shaped bendings such as the side of strip is unrestrained, middle wave, so as to improve the glacing flatness of strip.Second, improve processability
Can, strip is mitigated in follow-up deformation or there is no yield point elongation by stretch bending effect, so as to produce homogeneous deformation,
Improve processing characteristics.Equally, in the presence of straightening, the scale on surface of strip is further loose or peels off, and further reaches
The effect of dephosphorization has been arrived, good condition is created for acid cleaning process.
A. in pickling process, hot rolled strip carries out pickling by 3 descaling baths：Respectively：
In first descaling bath：Total acid concentration is 195~225g/L, and Fe concentration is 105~125g/L, the concentration of free acid
For 35~60g/L, temperature is 85~100 DEG C
In second descaling bath：Total acid concentration is 195~225g/L, and Fe concentration is 75~95g/L, and the concentration of free acid is
100~125g/L, temperature are 85~100 DEG C；
In 3rd descaling bath：Total acid concentration is 195~225g/L, and Fe concentration is 25~35g/L, and the concentration of free acid is
155~175g/L, temperature are 85~100 DEG C；
During pickling process, total pickling time is 25~30s, preferably 28s.
B. in rinsing process, steel band enters potcher, and potcher is level Four ladder-type cell body, by the way of adverse current hydro-peening
Rinsing, by the pH value for entering displacement adjustment rinsing section：6.0~7.0, the μ s/cm of electrical conductivity≤35；
C. in baking operation：Air temperature control blows edge equipment for 120 ± 10 DEG C, and steel band two will be accumulated in using compressed air
The raffinate on side is easily dried steel band edge to the outer side-blown brush of steel band；Heated-air drying equipment, for the water of steel strip surface attachment
Divide continuous drying.
Corrosion inhibiter technique：In order to obtain the automobile using hot rolling acid-cleaning steel of great surface quality, prevent strip from being stopped in acid solution
Overlong time and produce overpickling situation, add corrosion inhibiter in descaling bath and potcher respectively.Add the corrosion inhibiter of descaling bath
For preventing overpickling when strip is stopped at acid tank, the corrosion inhibiter for adding potcher is used to prevent from producing when strip is stopped at potcher
Raw sour spot.
D. smooth process：The elongation percentage of 5th frame of five frames is arranged to 1.2~1.5%, and leveling roll Ra=1.50~
2.50μm。
In above-mentioned manufacture method, alloying order：Silicon barium calcium ferro-aluminum → ferrosilicon → ferromanganese → ferro-niobium, adds aluminium using aluminium machine is added
Line carries out final deoxidizing, and ferromanganese is added in application of vacuum or when ladle furnace silico-calcium handles.
The molten steel for being adjusted to mentioned component scope is melted out, is cast with the method for continuous casting, its slab can use cold send
Or the mode of hot sending is sent to hot rolling mill and rolled.
The beneficial effects of the present invention are：
(1) in the Design of Chemical Composition of steel grade, the intensity of steel plate had both been ensure that, in turn ensure that the performance of steel plate,
Also make smelting cost cheap；
(2) in smelting process design, in the case where ensureing the principle of steel and degree of purity, the content of sulphur in steel is reduced, it is determined that
Rational deoxidation alloying order and furnace outer refining process；
(3) in hot continuous rolling process design, it is determined that rational cooling controlling and rolling controlling process and Study on Heat Strip Skin Process, it is ensured that finished product
The excellent plate shape and comprehensive mechanical performance of strip；
(4) in acid cleaning process design, rational acid strength, temperature and pickling time are formulated, it is ensured that the high table of strip
Face quality.
(5) roll in online five frame last frame using acid and strip is carried out smooth, solve production hot rolling acid-cleaning
The limitation of steel equipment, the surface roughness of strip can be purposefully controlled, improve the plasticity of strip, improve the high surface of strip
Quality.
In summary, the tensile strength produced using the inventive method is 540MPa level great surface quality automobile using hot rollings
Pickling steel, have good ductility, cold stamping forming property, welding performance and cold-bending property good.Practical application knot
Fruit shows that the chemical composition and mechanical performance for the 540MPa level great surface quality automobile using hot rolling acid-cleaning steel steel plates produced are steady
Fixed, cold stamping forming property is good, and possesses great surface quality, is fully able to the high standard system for meeting automobile using hot rolling acid-cleaning steel
Make requirement.The parts being manufactured into are tested, find the detection knot such as coating performance, dimensional accuracy, welding performance of part
Fruit accords with the standard requirement of Automobile Enterprises.The tensile strength of the inventive method production is 540MPa level great surface qualities automobile using heat
Roll pickling steel and be widely used in the stamping of automobile structure.
Brief description of the drawings
Fig. 1 is the metallurgical structure (metallographic structure × 500) of the present invention.
Embodiment
In order to preferably explain the present invention, below in conjunction with the specific embodiment main contents that the present invention is furture elucidated, but
Present disclosure is not limited solely to following examples.
Table 1 lists the present invention and can be used for production tensile strength 540MPa level great surface quality automobile using hot rolling acid-cleanings steel six
The chemical composition of kind instantiation.The production method of this six kinds of 540MPa level great surface quality automobile using hot rolling acid-cleaning steel is as follows：
Carry out top bottom blowing in 90 tons and 250 tons converters of steel mill, using Desulphurization of Pig Iron, make S in molten iron≤
0.005%；Tapped after stove 1/3 when start plus ferroalloy, add during tapping 2/3 and finish, alloying order：Silicon barium calcium ferro-aluminum → silicon
Iron → ferromanganese → ferro-niobium, using add aluminium machine add aluminum steel carry out final deoxidizing, in application of vacuum or ladle furnace silico-calcium handle when, according to
0.5kg~0.7kg is per ton be into silicon-calcium wire, speed be 250m/min~300m/min, the chemical composition in steel is met table 1
It is required that (actual constituent is shown in Table 1), surplus is Fe and is inevitably mingled with；Again by the pouring molten steel of composition shown in table 1 into 230~
The slab of 250mm × 1050~2150mm sections.Then slab is delivered into hot rolling mill, carried out on 1700mm and 2250mm milling trains
Hot continuous rolling, continuous casting steel billet is first heated to 1270~1310 DEG C of progress roughing, end temp is 1090~1130 DEG C, then carries out essence
Roll, finishing temperature is 840~880 DEG C, the full passage dephosphorization of the operation of rolling, dephosphorization hydraulic pressure：30~40MPa, strip roll after control
Cooling is 35 DEG C of the water temperature ＜ of cooling water by the way of leading portion section cooling, and it is >=35 DEG C/s to control cooling velocity, batches temperature
Spend for 560~600 DEG C.Carry out smooth after rolling coil of strip, smooth according to permanent roll-force Schema control, roll-force is 200~250
Ton, finally gives 2.2~5.0mm hot continuous-milling steel plate, then send cold rolling mill acid to roll online carry out pickling, the straightening technique before pickling
Elongation control pattern is taken, elongation control is 2.5~3.5%.Pickling, rinsing, stoving process are shown in Table 2, total pickling
Time is about 28 seconds.Cold rolling levelling technique is carried out afterwards, and the carry out using the 5th frame of five frames is smooth, and elongation percentage is arranged to
(1.2~1.5) %, Ra=1.5 μm of leveling roll, finally carry out taking Electrostatic greasing, applying oil mass can be according to customer requirement and reality
Service condition is set, and finally batches to obtain the automobile using hot rolling acid-cleaning steel of great surface quality.
As shown in the figure：The microscopic structure of steel plate is ferrite+a small amount of fine pearlite, and grain size is 11.5 grades.6 embodiments
The mechanical property test result of the steel of preparation is listed in table 3, from the point of view of the performance that table 3 reflects, thickness be 2.2~5.0mm respectively into
The automobile using hot rolling acid-cleaning steel capital of the great surface quality divided can meet the high standards of automobile using hot rolling acid-cleaning steel.
The chemical composition (wt.%) of steel in the embodiment of table 1
| Composition | C | Mn | Si | P | S | Nb | Cu | Ni | Cr | Als |
| Embodiment 1 | 0.05 | 1.26 | 0.09 | 0.00 | 0.004 | 0.042 | 0.01 | 0.005 | 0.01 | 0.035 |
| Embodiment 2 | 06.05 | 10.15 | 40.11 | 80.01 | 0.005 | 0.041 | 00.01 | 0.010 | 20.02 | 0.038 |
| Embodiment 3 | 01.05 | 15.15 | 20.09 | 20.01 | 0.004 | 0.039 | 20.02 | 0.011 | 01.01 | 0.034 |
| Embodiment 4 | 30.05 | 18.25 | 80.12 | 00.00 | 01.004 | 0.043 | 00.01 | 0.013 | 07.01 | 0.037 |
| Embodiment 5 | 08.05 | 16.28 | 10.10 | 90.01 | 00.003 | 0.044 | 10.01 | 0.012 | 50.01 | 0.038 |
| Embodiment 6 | 30.05 | 31.19 | 50.11 | 20.01 | 70.004 | 0.040 | 30.00 | 0.017 | 20.01 | 0.039 |
The pickling of the steel of 2 embodiment of table 1~6, rinsing, drying, flattening process
The mechanical property of the product of table 3
Other unspecified parts are prior art.Although above-described embodiment is made that to the present invention and retouched in detail
State, but it is only part of the embodiment of the present invention, rather than whole embodiments, people can also according to the present embodiment without
Other embodiment is obtained under the premise of creativeness, these embodiments belong to the scope of the present invention.
Claims (5)
1. a kind of tensile strength for automobile is the hot rolling acid-cleaning steel of 540MPa levels, it is characterised in that：The hot rolling acid-cleaning steel
The percetage by weight of chemical composition is：C：0.050~0.070%, Si：0.050~0.150%, Mn：1.100~1.350%, P
≤ 0.020%, S≤0.006, Nb：0.037~0.047, Als：0.015~0.045%, Cu≤0.300%, Ni≤
0.300%th, Cr≤0.300%；Remaining is Fe and inevitable impurity.
2. the tensile strength for automobile is the hot rolling acid-cleaning steel of 540MPa levels according to claim 1, it is characterised in that：Institute
The percetage by weight for stating hot rolling acid-cleaning steel chemical composition is：C：0.050~0.060%, Si：0.075~0.125%, Mn：
1.125~1.325%, P≤0.020%, S≤0.005%, Nb：0.038~0.045%, Als：0.030~0.040%, Cu
≤ 0.150%, Ni≤0.150%, Cr≤0.150%；Remaining is Fe and inevitable impurity.
3. the tensile strength for automobile is the hot rolling acid-cleaning steel of 540MPa levels according to claim 2, it is characterised in that：Institute
The percetage by weight for stating hot rolling acid-cleaning steel chemical composition is：C：0.56%th, Si：0.094%th, Mn：1.260%th, P：0.008%th,
S：0.004%th, Nb：0.042%th, Als：0.035%th, Cu：0.010%th, Ni：0.005%th, Cr：0.012%；Remaining be Fe and
Inevitable impurity.
4. the tensile strength for automobile according to claim 1 or 2 or 3 is the hot rolling acid-cleaning steel of 540MPa levels, its feature
It is：The hot rolling acid-cleaning steel lower yield strength ReL：355~435MPa；Tensile strength Rm：540~650MPa；Elongation A：
21~31%.
A kind of 5. claim 1 or 2 or 3 system with great surface quality and the hot rolling acid-cleaning steel of tensile strength 540MPa levels
Make method, this method by desulfurizing iron, converter smelting, application of vacuum/Argon and ladle furnace, continuous casting, shaping, heating of plate blank,
Hot continuous rolling, section cooling, batch, finishing, acid cleaning process, it is smooth, batch, rewinding, oiling and packaging manufacture obtain hot rolling acid-cleaning
Steel, it is characterised in that：
1) in Hot Strip Rolling, heating-up temperature is 1270~1310 DEG C, and roughing outlet temperature is 1090~1130 DEG C, finishing temperature
For 840~880 DEG C, coiling temperature is 560~600 DEG C；
2) section cooling mode：Leading portion cools down, 35 DEG C of coolant water temperature ＜, 35~110 DEG C/s of cooling velocity；
3) to be steel roll the process of online production to acid cleaning process in acid, including uncoiling, aligning, cutting head cutting tail, welding, straightening, pickling,
Rinsing, drying and cutting edge, wherein,
A. in pickling process, hot rolled strip carries out pickling by 3 descaling baths：Respectively：
In first descaling bath：Total acid concentration is 195~225g/L, and Fe concentration is 105~125g/L, and the concentration of free acid is 35
~60g/L, temperature are 85~100 DEG C；
In second descaling bath：Total acid concentration is 195~225g/L, and Fe concentration is 75~95g/L, and the concentration of free acid is 100
~125g/L, temperature are 85~100 DEG C；
In 3rd descaling bath：Total acid concentration is 195~225g/L, and Fe concentration is 25~35g/L, and the concentration of free acid is 155
~175g/L, temperature are 85~100 DEG C；
During pickling process, total pickling time is 25~30s；
B. in rinsing process, steel band enters potcher, and potcher is level Four ladder-type cell body, is floated by the way of adverse current hydro-peening
Wash, by the pH value for entering displacement adjustment rinsing section：6.0~7.0, the μ s/cm of electrical conductivity≤40；
C. in baking operation：Air temperature control blows edge equipment for 120 ± 10 DEG C；
D. smooth process：The elongation percentage of 5th frame of five frames is arranged to 1.2~1.5%, leveling roll Ra：1.5~2.50 μm.
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Application publication date: 20171201 |