CN106011632B - Tensile strength is 440MPa grades of great surface quality automobile hot rolling acid-cleaning steel and production method - Google Patents
Tensile strength is 440MPa grades of great surface quality automobile hot rolling acid-cleaning steel and production method Download PDFInfo
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- CN106011632B CN106011632B CN201610556820.8A CN201610556820A CN106011632B CN 106011632 B CN106011632 B CN 106011632B CN 201610556820 A CN201610556820 A CN 201610556820A CN 106011632 B CN106011632 B CN 106011632B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C23G1/08—Iron or steel
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- Crystallography & Structural Chemistry (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Tensile strength is 440MPa grades of great surface quality automobile hot rolling acid-cleaning steel, and component and wt% are：C：0.090~0.120%, Si≤0.080%, Mn：1.100~1.500%, P≤0.025%, S≤0.006%, Als：0.015~0.040%；Production method：Routine smelts and is casting continuously to form base；To heating strand；Hot rolling；It batches；Section cooling；Acid cleaning process.The production capacity more than needed that the present invention rolls on-line production line using cold rolling acid produces automobile hot rolling acid-cleaning steel, the surface roughness of pickling steel is controlled using the last one rack of five racks, make the surface roughness of product at 0.4 ~ 1.0 μm, and the ton steel cost average specific prior art reduces no less than 15%, and it is good with good ductility, cold stamping forming property, welding performance and cold-bending property, meet the requirement of automobile hot rolling acid-cleaning steel.
Description
Technical field
The present invention relates to a kind of Automobile Plate and its production method, it is 440MPa grades of automobiles to specifically belong to a kind of tensile strength
With hot rolling acid-cleaning steel and production method.
Background technology
With the whole superfluous continuous aggravation of steel and iron industry production capacity, low cost manufacturing 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 to the control of material cost with regard to most important.The current situation of steel and iron industry and auto industry, further promotes
The application and development of automobile hot rolling acid-cleaning steel.
Automobile hot rolling acid-cleaning steel thickness is generally in the range of 2.0 ~ 6.0 mm, it is desirable that great surface quality, to meet vapour
Strict standard of the vehicle to steel material, it is desirable that must not have bubble, crackle, scab, fold and be mingled with etc. to making on the surface of strip
With harmful defect, the defect of the influence strip forming property of the half of belt steel thickness tolerance must not be also had more than, for example is scratched, pressure
The defects of trace, point, roll marks.Automobile hot rolling acid-cleaning steel primary crossbeam in chassis system, auxiliary girder, preceding in passenger car
Bridge, rear axle；Wheel hub, spoke in wheel system；Structural member in bodywork system and safety member；Force structure in seat system
Part and safety member amount to a passenger car pickling steel dosage about 100kg.And the driver's cabin safety knot component of commercial car, compartment bottom
Plate etc. all uses hot rolling acid-cleaning Steel material, amounts to a commercial car pickling steel dosage about 16kg.
The characteristics of automobile hot rolling acid-cleaning steel, is as follows：Compared with the general plate of hot rolling, automobile 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 ideal automobile structure material；Two
It is high dimensional accuracy, after the flattened technique of automobile hot rolling acid-cleaning steel, template is optimized, to reduce strip profile and flatness
The defect of difference.Compared with cold rolling plate, under the premise of ensureing strip surface quality requirement, automobile hot rolling acid-cleaning steel
" with hot Dai Leng ", which can be steel mill, to be reduced production cost, is user's reduction purchase cost.
At home and abroad some large iron and steel enterprises possess the continous way hot rolling acid-cleaning steel production line of profession, and some steels are looked forward to
Industry only possesses plug-type hot rolling acid-cleaning steel production line；Have hot rolling acid-cleaning steel production line or not, can only entrust production hot rolling outside
Pickling steel.Continous way hot rolling acid-cleaning steel production line production automobile hot rolling acid-cleaning steel quality is guaranteed, but equipment input cost
It is too high；Although plug-type hot rolling acid-cleaning steel production line produces hot rolling acid-cleaning steel cost reduction with outer committee, quality cannot protect
Barrier, especially production have the automobile hot rolling acid-cleaning steel of great surface quality requirement not ensure, furthermore, pickling steel surface roughness
It is unable to control, and cannot meet the requirements.
Through preliminary search, Chinese Patent Application No. is the document of 201210298259.X, disclose a kind of thickness≤
The production method of 1.8mm automobile Thin Specs hot rolling acid-cleaning steel, uses Thin Specs CSP technique productions, the chemical composition of steel to press
Weight percent content is：C0.04 ~ 0.07%, Si0.10 ~ 0.30%, Mn0.60 ~ 1.30%, P≤0.025%, S≤
0.012%, Ti0.02 ~ 0.04%, Als0.010 ~ 0.030%；Sheet billet produces thickness≤1.8mm.Tensile strength >=400MPa.
Production stage：Desulfurizing iron, stove is smelted and Alloying Treatment；Ladle furnace processing；Continuous casting and rolling；High pressure water dephosphorization, pressure control
In 25 ~ 35MPa；Controlled rolling section cooling, batches, is pickling, smooth, controls smooth elongation percentage and is no more than 2%；Finishing is adopted
Use Electrostatic greasing.It is existing insufficient：The characteristics of due to CSP producing lines, limits the compression ratio of steel rolling and steel composition range is narrow
Narrow, the more conventional hot steel rolling production of the steel plate template of production, surface quality, mechanical property wants poor, cannot meet great surface quality vapour
The requirement of automobile-used hot rolling acid-cleaning steel.
It is high to disclose a kind of 380MPa grades of single side enamel for the document that Chinese Patent Application No. is 201310731354.9
Intensity deep-draw hot rolling acid-cleaning steel plate, chemical composition mass percent are：Mn0.35-0.65%、 Als0.015-0.045%、
Ti ： 0.030-0.060%、 S ：0.008-0.016%、 C ≤ 0.018%、Si ≤0.05%、P ≤0.020%、N ≤
0.006%.Yield strength >=380MP of the steel of example steel, 35% or more elongation percentage, the present invention coordinate controlled rolling and control cold
But the enamelware that the enamel of technology production makes through wet method or electrostatic single side enamel technology is quick-fried without squama, and adhesion property is good,
Meet 20,000 1~9bar circulating chilled water hydraulic pressure fatigue tests.It is existing insufficient：The steel production cost is higher, Ti contents compared with
Greatly, the mechanical property of steel plate is relatively low, belongs to the production scope of glassed steel, cannot replace great surface quality automobile hot rolling acid-cleaning
Steel uses.
Invention content
The invention reside in the shortcomings of the prior art is overcome, provide a kind of before ensureing armor plate strength and performance
It puts, steel surface roughness is at 0.4 ~ 1.0 μm, and production cost reduces and is not less than 440MPa grades of high surfaces of 15% tensile strength
Quality automobile hot rolling acid-cleaning steel and production method.
Realize the technical measures of above-mentioned purpose：
Tensile strength is 440MPa grades of great surface quality automobile hot rolling acid-cleaning steel, component and weight percent content
For：C：0.090~0.120%, Si≤0.080%, Mn：1.100~1.500%, P≤0.025%, S≤0.006%, Als：0.015
~0.040%, remaining is iron and inevitable impurity；Hot rolling acid-cleaning steel surface roughness requirements：Ra：0.4~1.0 μm.
It is：C：0.090~0.110%.
It is：Mn：1.100~1.300%.
It is：Als：0.030~0.038%.
Produce the method that tensile strength is 440MPa grades of great surface quality automobile hot rolling acid-cleaning steel, step：
1）Routine smelts and is casting continuously to form base；
2）To heating strand, heating temperature is 1220 ~ 1260 DEG C；
3）Hot rolling is carried out, and controls roughing outlet temperature at 1020 ~ 1060 DEG C, finish rolling finishing temperature is at 800 ~ 840 DEG C；
4）It is batched, control coiling temperature is at 580 ~ 620 DEG C；
5）Section cooling is carried out, is cooled down using preceding segmentation, and controls cooling velocity and is not less than 26 DEG C/s；
6）Carry out acid cleaning process
A, it carries out uncoiling and aligns；
B, elongation control pattern is taken to carry out straightening, elongation control is 1.2~2.2%；
Online carry out pickling is rolled using three descaling bath acid, wherein requiring：1# descaling baths：Total acid concentration 200~
220g/L pickles, Fe concentration is in 105~125g/L pickles, and the concentration of free acid is in 35~55g/L pickles, pickling temperature
Degree is at 80~95 DEG C；2# descaling baths：Total acid concentration in 200~220g/L pickles, Fe concentration in 75~95g/L pickles,
The concentration of free acid is in 85~105g/L pickles, and pickling temperature is at 80~95 DEG C；3# descaling baths：Total acid concentration about 200~
220g/L pickles, Fe concentration is in 25~45g/L pickles, and the concentration of free acid is in 145~165g/L pickles, and temperature is 80
~95 DEG C；Corrosion inhibiter is added according to 16~18g/L pickles in each descaling bath；And it controls total pickling time and is no more than 24
Second；
C, it is rinsed, potcher uses level Four ladder-type groove body, is used in combination the mode of adverse current hydro-peening to rinse, and control drift
The pH value for washing section is not less than 5.5, and conductivity is no more than 50 μ s/cm：And it is added and delays according to 16~18g/L pickles in potcher
Lose agent；
D, it is dried, the raffinate on steel band both sides will be accumulated in the outer side-blown brush of steel band using compressed air, and control
Drying temperature is at 110~130 DEG C；
E, cold rolling levelling is carried out, smooth rate is set as 0.6~2.6%, and leveling roll Ra is 1.5~2.0 μm；And keep calibrator complete
Journey comes into operation；
F, conventional Electrostatic greasing is carried out.
The effect of each element and main technique and mechanism in the present invention
Carbon：Carbon is intensified element most economical in mild steel, but too high levels reduce the plasticity of steel and impact tough
Property, 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 it needs
Under the premise of proof strength, the content of reduction carbon as possible.So its content is limited to 0.090 according to actual needs~
0.120% range.
Silicon：Silicon is cheap and effective deoxygenation of liquid steel element.But its content is more than 0.300%, then can deteriorate hot rolled steel plate
Surface quality, and then influence pickling steel surface quality, it is particularly disadvantageous for great surface quality automobile hot rolling acid-cleaning steel.Institute
Its content is limited to 0.080% or less range.
Manganese：Manganese is to improve intensity and the most effective element of toughness, manganese to expand austenitic area, can improve the intensity-of steel
Extend balance.But excessively high Mn contents can produce serious influence to the ductility and impact property of steel.In consideration of it, by it
Content is limited to 1.100~1.500% ranges.
Phosphorus：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
Therefore increasing the sensibility of weld cracking is a kind of harmful element in automobile hot rolling acid-cleaning steel, should reduce phosphorus as far as possible
Content in steel.And phosphorus easily causes center segregation of casting blank, and cold bending performance, toughness is caused to deteriorate, and therefore, sets it
Upper content limit is 0.025%.
Sulphur：Sulphur is very harmful element.Sulphur in steel is mainly present in the form of (Mn, Fe) S is mingled in steel, this
Sulphide inculsion is very unfavorable to the impact flexibility of steel, cold-bending property, plasticity etc., and causes each to different of plate property
Property, therefore, sulfur content in steel need to be controlled more lower better.Based on the considerations of to steel plate cold bending forming technology and manufacturing cost,
Plan sulfur content in steel to control below 0.006%.
Aluminium：Aluminium adds for deoxidation, when Als contents are less than 0.010%, cannot play its effect；Another party
Face, aluminium influence the welding performance of steel, and the aluminium for adding volume is easy to form aluminium oxide agglomerate.Therefore, Als contents are limited to 0.015
~0.040% range.
The present invention rolls the process of online production in entire pickling steel in acid：Uncoiling → aligning → cutting head cutting tail → welding →
Straightening → pickling（Add corrosion inhibiter）→ rinsing（Add corrosion inhibiter）→ drying → cutting edge is → smooth → to batch → finishing → oiling → acid
Wash finished product.
In the present invention, why in pickling and potcher corrosion inhibiter is added, it is therefore intended that prevent strip in acid solution and
The residence time is long and generate overpickling situation in rinsing, to obtain the hot rolling acid-cleaning steel band of excellent surface quality, to meet
Constantly require the growth requirement of the auto industry of high quality.
The production capacity more than needed that the present invention rolls on-line production line using cold rolling acid produces automobile hot rolling acid-cleaning steel, utilizes five racks
The last one rack the surface roughness of pickling steel is controlled, make the surface roughness of product in a rational range
It is interior, it realizes great surface quality requirement, meets the requirement of automobile hot rolling acid-cleaning steel, to create economic benefit.
Compared with prior art, the present invention its with good ductility, cold stamping forming property, welding performance and
Cold-bending property is good, and the chemical composition and stable mechanical performance of steel plate, and cold stamping forming property is good, and possesses high surface matter
Amount, the high standard manufacture for being fully able to meet automobile hot rolling acid-cleaning steel require.It is right through testing the automobile rim and spoke manufactured
The parts being manufactured into are tested, it is found that the testing results such as the coating performance, dimensional accuracy, welding performance of part meet this
The standard requirement of Automobile Enterprises.
Description of the drawings
Attached drawing 1 is the metallurgical structure figure of the present invention.
Specific implementation mode
The present invention is described in detail below：
Table 1 is the component comparative example of various embodiments of the present invention and comparative example；
Table 2 is main technologic parameters comparative example before the pickling of various embodiments of the present invention and comparative example；
Table 3 is pickling and the rinsing process parameter value list of various embodiments of the present invention and comparative example；
Table 4 is various embodiments of the present invention and comparative example performance test results list.
Various embodiments of the present invention produce according to the following steps：
1）Routine smelts and is casting continuously to form base；
2）To heating strand, heating temperature is 1220 ~ 1260 DEG C；
3）Hot rolling is carried out, and controls roughing outlet temperature at 1020 ~ 1060 DEG C, finish rolling finishing temperature is at 800 ~ 840 DEG C；
4）It is batched, control coiling temperature is at 580 ~ 620 DEG C；
5）Section cooling is carried out, is cooled down using preceding segmentation, and controls cooling velocity and is not less than 26 DEG C/s；
6）Carry out acid cleaning process
A, it carries out uncoiling and aligns；
B, elongation control pattern is taken to carry out straightening, elongation control is 1.2~2.2%；
Online carry out pickling is rolled using three descaling bath acid, wherein requiring：1# descaling baths：Total acid concentration 200~
220g/L pickles, Fe concentration is in 105~125g/L pickles, and the concentration of free acid is in 35~55g/L pickles, pickling temperature
Degree is at 80~95 DEG C；2# descaling baths：Total acid concentration in 200~220g/L pickles, Fe concentration in 75~95g/L pickles,
The concentration of free acid is in 85~105g/L pickles, and pickling temperature is at 80~95 DEG C；3# descaling baths：Total acid concentration about 200~
220g/L pickles, Fe concentration is in 25~45g/L pickles, and the concentration of free acid is in 145~165g/L pickles, and temperature is 80
~95 DEG C；Corrosion inhibiter is added according to 16~18g/L pickles in each descaling bath；And it controls total pickling time and is no more than 24
Second；
C, it is rinsed, potcher uses level Four ladder-type groove body, is used in combination the mode of adverse current hydro-peening to rinse, and control drift
The pH value for washing section is not less than 5.5, and conductivity is no more than 50 μ s/cm：And it is added and delays according to 16~18g/L pickles in potcher
Lose agent；
D, it is dried, the raffinate on steel band both sides will be accumulated in the outer side-blown brush of steel band using compressed air, and control
Drying temperature is at 110~130 DEG C；
E, cold rolling levelling is carried out, smooth rate is set as 0.6~2.6%, and leveling roll Ra is 1.5~2.0 μm；And keep calibrator complete
Journey comes into operation；
F, conventional Electrostatic greasing is carried out.
The chemical composition comparative example of 1 various embodiments of the present invention of table and comparative example steel（wt.%）
Main technologic parameters comparative example before the pickling of 2 various embodiments of the present invention of table and comparative example
The pickling and rinsing of 3 various embodiments of the present invention of table and comparative example, Hot Air Dying Technology Parameters comparative example
Note：L is every liter of pickle in table 3；Rinsing medium is condensed water or desalted water；Drying uses compressed air.
The performance test results list of 4 various embodiments of the present invention of table and comparative example product
It can know from table 4, steel of the present invention is mainly the automobile hot rolling acid-cleaning steel of 2.0mm or more regular sizes, by
In with good comprehensive mechanical property, tensile strength is moderate, good percentage elongation, can substitute the cold rolling low-alloy production of same level
Product, the extensive use on automobile.This steel grade has bright and clean surface and good coating property, it is particularly possible to make on wheel
With, meet wheel to material great surface quality, good coating performance, good cold formability can requirement, to reduce vapour
Vehicle manufacturing cost, improves benefit.
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.
Claims (1)
1. tensile strength is the production method of 440MPa grades of great surface quality automobile hot rolling acid-cleaning steel, step：
1）Routine smelts and is casting continuously to form base；The component and weight percent content of its strand be：C：0.101~0.120%, Si≤
0.080%, Mn：1.10~1.189%, P≤0.025%, S≤0.006%, Als：0.015~0.040%, remaining is iron and can not keep away
The impurity exempted from；Hot rolling acid-cleaning steel surface roughness requirements：Ra：0.4~1.0 μm；
2）To heating strand, heating temperature is 1220 ~ 1260 DEG C；
3）Hot rolling is carried out, and controls roughing outlet temperature at 1020 ~ 1060 DEG C, finish rolling finishing temperature is at 800 ~ 829 DEG C；
4）It is batched, control coiling temperature is at 580 ~ 620 DEG C；
5）Section cooling is carried out, is cooled down using preceding segmentation, and controls cooling velocity and is not less than 26 DEG C/s；
6）Carry out acid cleaning process
A, it carries out uncoiling and aligns；
B, elongation control pattern is taken to carry out straightening, elongation control is 1.2~2.2%；
Online carry out pickling is rolled using three descaling bath acid, wherein requiring：1# descaling baths：Total acid concentration is in 200~220g/L
Pickle, Fe concentration in 105~125g/L pickles, the concentration of free acid in 35~55g/L pickles, pickling temperature 80~
95℃；2# descaling baths：Total acid concentration in 200~220g/L pickles, Fe concentration in 75~95g/L pickles, free acid
Concentration is in 85~105g/L pickles, and pickling temperature is at 80~95 DEG C；3# descaling baths：Total acid concentration about 200~220g/L acid
Washing lotion, Fe concentration is in 25~45g/L pickles, and the concentration of free acid is in 145~165g/L pickles, and temperature is at 80~95 DEG C；
Corrosion inhibiter is added according to 16~18g/L pickles in each descaling bath；And it controls total pickling time and is no more than 24 seconds；
C, it is rinsed, potcher uses level Four ladder-type groove body, is used in combination the mode of adverse current hydro-peening to rinse, and control rinsing section
PH values be not less than 5.5, conductivity be no more than 50 μ s/cm：And inhibition is added according to 16~18g/L pickles in potcher
Agent；
D, it is dried, the raffinate on steel band both sides will be accumulated in the outer side-blown brush of steel band using compressed air, and control drying
Temperature is at 110~130 DEG C；
E, cold rolling levelling is carried out, smooth rate is set as 0.6~2.6%, and leveling roll Ra is 1.5~2.0 μm；And calibrator whole process is made to throw
Enter to use；
F, conventional Electrostatic greasing is carried out.
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| CN106825080A (en) * | 2017-01-11 | 2017-06-13 | 首钢京唐钢铁联合有限责任公司 | A kind of method for removing Automobile Plate steel red rust defect |
| CN107723588A (en) * | 2017-07-31 | 2018-02-23 | 唐山钢铁集团有限责任公司 | A kind of car beam steel and its continuous acid-washing unit production method |
| CN110479774B (en) * | 2019-08-13 | 2021-01-08 | 武汉钢铁有限公司 | Method for eliminating pit defect on surface of thin hot-rolled pickled steel |
| CN111020385B (en) * | 2019-12-21 | 2021-11-19 | 河钢股份有限公司承德分公司 | Vanadium-containing hot-rolled pickled plate and pickling method thereof |
| CN111663078B (en) * | 2020-06-09 | 2021-09-21 | 首钢集团有限公司 | Hot-rolled pickled plate and method for eliminating pit defect of hot-rolled pickled plate |
| CN113755748B (en) * | 2021-08-18 | 2022-11-29 | 武汉钢铁有限公司 | Preparation method of hot-rolled pickled steel with high fatigue for automobile wheels |
| CN113652695B (en) * | 2021-08-18 | 2022-11-25 | 马鞍山钢铁股份有限公司 | Production method for improving surface corrosion resistance of hot-rolled pickled steel plate |
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