CN105401090B - A kind of precision stamping automotive seat regulation tooth plate cold-rolled steel sheet and its manufacture method - Google Patents
A kind of precision stamping automotive seat regulation tooth plate cold-rolled steel sheet and its manufacture method Download PDFInfo
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Abstract
The present invention relates to a kind of precision stamping automotive seat regulation tooth plate cold-rolled steel sheet and its manufacture method.Solve existing precision stamping automotive seat and adjust the technical problem that tooth plate cold-rolled steel sheet dimensional accuracy is low, Oxygen potential is relatively low, be not suitable for high speed and precision punching press.A kind of precision stamping automotive seat that the present invention is provided adjusts tooth plate cold-rolled steel sheet, and its chemical component weight percentage is：C：0.38%~0.45%, Si：0.20%~0.30%, Mn：0.70%~0.90%, P≤0.015%, S≤0.005%, Cr：0.80%~1.10%, Mo：0.05%~0.30%, Alt：0.015~0.050%, N≤0.0080%, surplus is iron and is unavoidably mingled with.The components such as automotive seat regulation tooth plate are made for high speed and precision punching press.
Description
Technical field
The present invention relates to a kind of cold-rolled steel sheet processed for precision stamping, more particularly to a kind of precision stamping automotive seat
Adjust tooth plate cold-rolled steel sheet and its manufacture method.
Background technology
Hot-strip is mainly produced by hot tandem, after spheroidizing, and intensity and plasticity obtain matched well,
It is widely used in fine industry, manufacture automobile, motorcycle, electric bicycle, tractor, hardware, household electrical appliances, device for switching, sewing
The precision components such as machine, camera, clock and watch, instrument and meter, communication electronics.The processing method process of traditional precision component is more, precision
Difference, is typically completed by Pu Chong, machining, forging, casting and powder metallurgy processing.After fine blanking technology, a process is just
The manufacture of whole part can be completed, with great technical advantage and economic benefit.
Therefore the key for being developed into popularizing fine dies technology of fine material, tooth plate is adjusted according to car industry automotive seat
Using needs, its cold-rolled steel sheet used need to have the property that：Thickness and precision is high, intensity is high and good toughness, and performance is uniform, carburizing
Body Oxygen potential is high, it is easy to the steel plate of high speed and precision punching press.
Chinese patent application 200910196004.4, discloses a kind of hot rolled steel plate for precision stamping and its manufacture method,
This steel plate has an excellent fine performance, intensity and hardness can matched well, suitably manufacture various complex precise components and essence
Rush that piece surface is highly polished, wearability is good；Its chemical analysis：C：0.05~0.30%；Si：No more than 0.50%；Mn：0.5
~1.50%；Cr：0.5~1.5%；Ni：0.02~0.5%；Al：No more than 0.04 %：P：No more than 0.02%；S：Do not surpass
Cross 0.01%.Also include Ti：No more than 0.05%, B：One or both of 0.0005~0.010%.
It is excellent that Chinese patent application 200780004015.3 and 200780004180.9 individually discloses a kind of fine processing
Steel plate and its manufacture method, this steel plate has excellent fine performance, and the processing and forming type after fine is also excellent；It is changed
Studying part is：C：0.1~0.5%；Si：No more than 0.50%；Mn：0.2~1.50%； P：No more than 0.03%；S：Do not surpass
Cross 0.02%, in addition to Cr：No more than 3.5%；Mo：No more than 0.7%；Ni：No more than 3.5%；Ti：0.01~0.10% He
B：One or both of 0.0005~0.010%；In Chinese patent application 200780004015.3, only describe ferritic
In particle diameter and the transgranular carbide particle diameter of ferrite, Chinese patent application 200780004180.9, only describe distribution of carbides and exist
Transgranular and number of grain boundaries ratio；Not publicly production controls the hardness of more direct and fine more key for this two pieces patent application
Index, does not disclose the carbide total amount directly related with hardness yet, can calculate that its hardness is relatively low from its composition and technique, it is impossible to
Meet the requirement of high rigidity.In addition, the Oxygen potential of cementite disclosed in Chinese patent application 200780004180.9 is 83 ~ 92%,
Oxygen potential is relatively low, and the performance of material can be caused uneven, it is impossible to meet the requirement of high speed and precision punching.
Technical scheme disclosed in above-mentioned patent application is directly to anneal after hot rolling, and the dimensional accuracy of material is obtained
Less than guarantee, the higher punching press of inapplicable precision.
The content of the invention
In order to overcome the deficiencies in the prior art, it is desirable to provide a kind of precision stamping automotive seat adjusts tooth plate cold-rolled steel sheet
And its manufacture method, the present invention is by using suitable composition design, and hot rolling, the design of cold rolling and annealing process can be controlled
Cementite Oxygen potential and carbide volume total amount processed, good matching between hardness and toughness meets automotive seat regulation tooth plate
Fine process requirements.
It is an object of the invention to provide a kind of precision stamping automotive seat regulation tooth plate cold-rolled steel sheet and its manufacture method,
Solve that existing precision stamping automotive seat regulation tooth plate cold-rolled steel sheet dimensional accuracy is low, Oxygen potential is relatively low, be not suitable for essence at a high speed
The technical problem of close punching press.
The technical solution adopted by the present invention is：
A kind of precision stamping automotive seat adjusts tooth plate cold-rolled steel sheet, and its chemical component weight percentage is：C：
0.38%~0.45%, Si：0.20%~0.30%, Mn：0.70%~0.90%, P≤0.015%, S≤0.005%, Cr：
0.80%~1.10%, Mo：0.05%~0.30%, Alt：0.015~0.050%, N≤0.0080%, surplus is Fe and can not
The tramp element avoided.
The chemical composition of precision stamping automotive seat regulation tooth plate cold-rolled steel sheet of the present invention is limited within the above range
Reason is as follows：
Carbon：Carbon be influence hot-roll annealing after and quenching after hardness element, in the present invention carbon content need be higher than
0.38%, it is necessary to add more alloying element supplement reinforcings when carbon content is less than 0.38%, otherwise it can not obtain as automotive seats
Hardness required by chair regulation tooth plate part, it is so uneconomical；On the other hand, when carbon content is more than 0.45%, to carburizing in material
The shape and Oxygen potential of body have influence, are unfavorable for precision stamping.The carbon content that the present invention is set is 0.38%~0.45%, mainly
Intensity and fine based on steel require to consider.
Silicon：Silicon is as solution strengthening element, and being solid-solubilized in has certain reinforcing effect in steel matrix, while during melting in steel
It is favourable to deoxidation, desulfurization containing appropriate silicon.For cold-rolled products, there is red rust oxygen in surface in course of hot rolling when Si contents are high
Change iron sheet, influence finished appearance, the present invention limits Si contents as 0.20%~0.30%.
Manganese：Manganese is important solution strengthening element, and can improve quenching degree, and in order to obtain this effect, content is more than
0.70%, during more than 0.90%, intensity is higher, does not utilize fine to process.The present invention limits Mn contents as 0.70%~0.90%.
Phosphorus：P in the present invention is impurity element, and segregation declines processability in crystal boundary, it is desirable to reduce its content as far as possible,
But in view of actual process control ability and dephosphorization cost, the present invention limits P≤0.015%.
Sulphur：Sulphur is impurity element in the present invention, and MnS field trashes are formed in steel, influences fine.Wish to reduce as far as possible
Its content, but in view of actual process control ability and desulphurization cost, the present invention limits S≤0.005%.
Chromium：Chromium is the formation element of carbide, and polytype alloy carbide can be formed in steel.Chromium can slow down austenite
Decomposition rate, be remarkably improved the quenching degree of steel, chromium in the hardness and anti-wear performance of steel, steel can be improved after quenched processing and is contained
When amount is more than 1.1%, the total amount of carbide is difficult to control, and chromium content does not reach requirement less than 0.8% hardness, and the present invention limits Cr and contained
Measure as 0.80%~1.10%.
Molybdenum：Molybdenum is ferrite former, has certain solid solubility in steel, can be with the element shape such as C, N in steel
Into compound.In quenching cooling procedure, Carbide Precipitation causes hardness and intensity to raise, and improves the hardness and wearability of steel,
The quenching degree and hardenability of material are improved simultaneously.The addition of molybdenum, allows steel to keep high rigidity in higher temperature tempering, improves
The stability being tempered during steel heat treatment.In order to reach that molybdenum content need to be more than 0.05% in such effect, steel；When molybdenum contains in steel
When amount is more than 0.30%, the hardness of steel during hot rolling can be caused to steeply rise, be unfavorable for following process.The present invention limit Mo contents as
0.05%~0.30%.
Nitrogen：Nitrogen belongs to harmful element in high-strength steel of the present invention, and nitrogen can seriously reduce the plasticity and toughness of material.In this hair
In bright, nitrogen exists in steel with free state, causes steel plate in uncoiling and follow-up shaping, during by tension, generation does not connect
Continuous yield phenomenon, produces waist folding and yield point elongation, it is therefore desirable to limit nitrogen content in surface of steel plate；But, too low nitrogen content
Production cost can be increased.The present invention limits N≤0.0080%.
Aluminium：The effect of aluminium in the present invention is to play a part of deoxidation and combine free state nitrogen, and aluminium is strong oxidizing property shape
The oxygen formation Al into element, and steel2O3Removed in steel-making.Aluminium with oxygen in addition to being combined, and the nitrogen also and in steel is combined, formationization
The AlN of state is closed, so that the nitrogen of free state is reduced, it is favourable to eliminating continuous yield phenomenon.But aluminium is too high to form excessive
Al2O3It is mingled with, and continuous casting is easy blocking sprue gate.The present invention limits Alt contents as 0.015%~0.050%.
A kind of precision stamping automotive seat adjusts the manufacture method of tooth plate cold-rolled steel sheet, and this method includes：
Molten steel carries out continuous casting after Fruit storage and obtains continuous casting steel billet, wherein the mass percent of the molten steel composition
For：C：0.38%~0.45%, Si：0.20%~0.30%, Mn：0.70%~0.90%, P≤0.015%, S≤
0.005%, Cr：0.80%~1.10%, Mo：0.05%~0.30%, Alt：0.015~0.050%, N≤0.0080%, surplus
It is mingled with for iron and unavoidably.
Continuous casting steel billet is in 1100 DEG C~1200 DEG C heating, and hot rolling is two-part rolling mill practice, and roughing is 5 passage tandem rollings,
More than austenite recrystallization temperature roll, roughing end temp is 1000 DEG C~1080 DEG C, and finish rolling is 7 passage tandem rollings, in Ovshinsky
Body non-recrystallization temperature interval rolling, finish rolling end temp is 810 DEG C~850 DEG C, the convexity of finishing rolling control hot rolled steel plate≤
60um, after finish rolling, steel plate thickness is 4mm~12mm, and section cooling is cold by force using leading portion, and coiling temperature is 540 DEG C~580 DEG C volumes
Obtain coils of hot-rolled steel；
By above-mentioned coils of hot-rolled steel again uncoiling, after pickling, small deformation is carried out on reversable mill or 5 Stands Cold Tandem Mills
That measures is cold rolling, and cold rolling reduction ratio is 10%~20%, and the steel band after cold-rolling deformation passes through bell-type annealing furnace annealing, annealing temperature
Scope is 710 DEG C~740 DEG C, and the annealing soak time is 10h~15h, batches the finished steel for obtaining that thickness is 3.2mm~10.8mm
Plate.
The manufacturing process system reason that the present invention takes is as follows：
1st, the setting of continuous casting steel billet heating-up temperature
Continuous casting steel billet heating-up temperature ensures austenitizing and hot-working requirement, slab heating temperature of the present invention in complete material
It is set as 1100 DEG C~1200 DEG C.
2nd, roughing end temp is set
Rough to ensure to carry out more than austenite recrystallization temperature, steel billet is in large deformation during less than austenite recrystallization temperature
When, easy output layering.Layout of the excessive temperature based on live rough frame and heating furnace, is also not readily reachable by, the present invention is set
Roughing finishing temperature is determined for 1000 DEG C~1080 DEG C.
3rd, the Crown control of hot rolled steel plate
Cold rolling and punching press is carried out because hot plate will longitudinally cut out bar, die parameters during punching press is frequently adjusted
It is whole, it is necessary to assure thickness deviation is in the range of ± 30um between the steel plate that is stamped.When hot plate convexity be more than 60um when, 10%-20% compared with
Small cold rolling reduction can not meet requirement, so cold-rolled steel sheet thickness deviation must be controlled by controlling the convexity of hot plate.This hair
Bright setting hot rolled steel plate convexity≤60um.
4th, finish rolling end temp is set
Due to adding chromium, molybdenum element in steel, it is possible to increase stabilization of austenite in material, material phase transformation point A is caused3With it is normal
Rule product is compared to declining to a great extent, through the testing of materials and calculating, its transformation temperature A3Scope is 769.9 DEG C~780.2 DEG C, passes through contrast
Experiment is it can be seen that when finish rolling end temp is higher, austenite crystal is thick, causes follow-up ferrite crystal grain thick, and intensity is not
Foot, while plate width direction Tissue distribution is uneven, and surface of steel plate is also easy to produce iron scale, and the too low rolling load of temperature significantly increases
Greatly.The present invention sets finish rolling finishing temperature as 810 DEG C~850 DEG C.
5th, hot-rolling coiling temperature is set
Hot-rolling coiling temperature is separated out to ferrite grain size in material and pearlite to be had an impact, and coiling temperature is more than 580
DEG C pearlite amount of precipitation is few, and the cementite lamella in pearlitic grain, away from big, intensity declines, when coiling temperature is less than 540 DEG C
Pearlite precipitation quantity is more, and layer is decreased obviously away from tiny, intensity height, but toughness.In order to obtain tiny ferritic structure and
Suitable pearlite separates out quantity, and the present invention sets hot-rolling coiling temperature as 540 DEG C~580 DEG C.
6th, cold rolling reduction ratio setting
The main technologic parameters that steel plate material is determined in cold rolling process are cold rolling reductions, in order to obtain higher size
Precision is high, while deforming the nodularization for promoting carbide, considers, and the preferred cold rolling reduction ratio of the present invention is 10%~20%.
7th, annealing temperature and annealing time setting
Through the testing of materials and calculating, material phase transformation point A of the present invention1Scope is 700 DEG C~710 DEG C, less than 710 DEG C material balls
Annealing is not complete, higher than 740 DEG C nodularization body particle growths, considers, and the present invention sets annealing temperature as 710 DEG C~740
℃；Soaking zone annealing time is less than 10h, and cementite is assembled into bulk, thick more than 15h ferrite crystal grains, and hardness declines, comprehensive
Consider, annealing time of the present invention is set as 10h~15h.
Precision stamping automotive seat that the present invention is obtained regulation tooth plate is ferrite+uniform with the microscopic structure of cold-rolled steel sheet
The spheroidite of Dispersed precipitate, the sum-rate of carbide is 10%~20%, and Oxygen potential >=95%, tissue grain size number is 9
~11 grades, the tensile strength Rm of steel plate is 440MPa~500MPa, and yield tensile ratio Rp0.2/Rm is 0.60~0.67, elongation after fracture
A50For 35%~45%, Vickers hardness Hv10 is 135~155.
The present invention has following good effect compared with prior art：
1st, the present invention by using carbon content be 0.38%~0.45% in carbon design, and by using Cr, Mo alloy into
Set up meter and improved hot rolling, cold-rolling process design separately, obtained a kind of high cold-rolled steel sheet of thickness and precision, passed through hot rolling technology control
Carbide total amount and refined crystalline strengthening mechanism processed control the purpose of steel plate hardness to reach, while high rigidity is obtained, make material
Possess good toughness, meet the demand of fine processing.
2nd, the present invention is by controlling cold rolling reduction ratio, and progress small deformation is cold rolling, while steel plate thickness precision is improved,
Cementite nodularization in follow-up spheroidizing process light plate tissue is promoted, and then shortens annealing time, the energy is reduced and disappears
Consumption.
3rd, the present invention is by using reasonable annealing process, and cementite Oxygen potential is more than 95% in obtained steel plate tissue, and more
Distribution is dissipated, performance uniformity is good, suitable high speed and precision punching.
Brief description of the drawings
Accompanying drawing 1 is the hot rolled steel plate metallographic structure photo of the embodiment of the present invention 4.
Accompanying drawing 2 is the cold rolled annealed plate metallographic structure photo of the embodiment of the present invention 4.
Embodiment
With reference to disclosed in embodiment 1~6 and 1-Chinese patent application of comparative example 200780004015.3, ratio
Compared with disclosed in example 2-China specially application 200780004180.9, the present invention will be further described, as shown in 1 ~ table of table 4.
The chemical composition of the present invention of table 1（Percentage by weight %）, surplus is Fe and inevitable impurity.
The requirement designed according to material composition of the present invention, using molten iron pre-desulfurization, converter top bottom blowing blows Ar stations
(or the heating of LF stoves) bottom blowing Ar ensures that mixing time is more than 5 minutes, at RH stoves progress trimming, vacuum circulation degassing
Reason, it is ensured that the pure degassing times of RH are more than 15 minutes, while feeding appropriate iron-calcium line, continuous casting uses low-carbon steel protecting slag, whole
Blow and scale continuous casting steel billet is cut into after Ar protective castings, casting.
After the heated stove of continuous casting steel billet is reheated, roll, process control parameter is shown in Table 2, lead on continuous hot tandem rolling mill
Cross after roughing milling train and finish rolling Continuous mill train controlled rolling, through section cooling, section cooling is cold by force using leading portion, is then rolled up
Take, produce qualified hot-rolled sheet coil, plate crown≤60um, thickness is 4mm~12mm, referring to the drawings 1, the metallographic of hot rolled steel plate
It is organized as fine ferrite+pearlite+a small amount of bainite.
The hot rolling technology control parameter of the present invention of table 2
By above-mentioned coils of hot-rolled steel again uncoiling after overpickling, small change is carried out on reversable mill or 5 Stands Cold Tandem Mills
Shape amount it is cold rolling, cold rolling reduction ratio is 10%~20%, the steel band after cold-rolling deformation by bell type annealing furnace, batch and obtain
Thickness 3.2mm~10.8mm finished steel plate.Annealing process is：Steel band bell type annealing furnace annealing region be 710 DEG C~
740 DEG C, the annealing soak time is 10h~15h.Cold rolling and annealing process control parameter is shown in Table 3.
Cold rolling, the annealing process control parameter of the invention of table 3
The precision stamping automotive seat obtained using the above method adjusts tooth plate cold-rolled steel sheet, referring to the drawings 2, cold-rolled steel
The spheroidite that the microscopic structure of plate is distributed for ferrite+even dispersion, and Dispersed precipitate, Oxygen potential >=95%, carbide ratio
Example 10%~20%, grain size number is 9.5 grades.
The steel plate that the present invention is obtained is according to metal material stretching test part 1:Room temperature test method（GB/T
228.1-2010）, Vickers Hardness Test of Metallic Materials part 1：Test method（GB/T 4340-2009）Carry out mechanical property
Detection.Mechanical performance data is shown in Table 4.
The tensile strength Rm for the cold-rolled steel sheet that the present invention is obtained is 440MPa~500MPa, and yield tensile ratio Rp0.2/Rm is 0.60
~0.67, elongation after fracture A50For 35%~45%, Vickers hardness Hv10 is 135~155.
The mechanical property of the cold-rolled steel sheet of the present invention of table 4
| Performance indications | Yield strength/MPa | Tensile strength/MPa | Yield tensile ratio | Elongation after fracture A50/% | Oxygen potential/% | Carbide proportion/% | Hv10 |
| The present invention | 265-325 | 440-500 | 0.60-0.67 | 35%-45% | ≥95 | 10-20 | 135-155 |
| Embodiment 1 | 270 | 450 | 0.60 | 43.1 | 96 | 15 | 140.4 |
| Embodiment 2 | 290 | 470 | 0.62 | 40.6 | 95 | 16 | 148.2 |
| Embodiment 3 | 285 | 470 | 0.61 | 41.5 | 96 | 15 | 142.4 |
| Embodiment 4 | 265 | 440 | 0.60 | 38.7 | 97 | 13 | 137.0 |
| Embodiment 5 | 325 | 490 | 0.66 | 36.2 | 96 | 18 | 155.1 |
| Embodiment 6 | 315 | 485 | 0.65 | 37.0 | 95 | 17 | 150.3 |
| Comparative example 1 | - | - | - | - | - | - | - |
| Comparative example 2 | - | - | - | - | ≥80 | - | - |
The cold-rolled steel sheet that the present invention is obtained has high product thickness precision, intensity height and good toughness, and performance is stablized, nodularization
Rate is high, it is easy to the advantage of high speed and precision punching press.
In addition to the implementation, the present invention can also have other embodiment.All use equivalent substitution or equivalent transformation shape
Into technical scheme, all fall within the protection domain of application claims.
Claims (4)
1. a kind of precision stamping automotive seat adjusts tooth plate cold-rolled steel sheet, its chemical component weight percentage is：C：0.38%
~0.45%, Si：0.20%~0.30%, Mn：0.70%~0.90%, P≤0.015%, S≤0.005%, Cr：0.80%
~1.10%, Mo：0.05%~0.30%, Alt：0.015~0.050%, N≤0.0080%, surplus is iron and inevitable
It is mingled with；Its microscopic structure is the spheroidite of ferrite+even dispersion distribution, the sum-rate of carbide for 10%~
20%, Oxygen potential >=95%, tissue grain size number is 9~11 grades；The yield strength of its 3.2mm~10.8mm thick cold rolled steel sheet
For 220MPa~270MPa, tensile strength Rm is 440MPa~500MPa, and yield tensile ratio Rp0.2/Rm is 0.60~0.67, has no progeny and stretches
Long rate A50For 35%~45%, Vickers hardness Hv10 is 135~155.
2. precision stamping automotive seat as claimed in claim 1 adjusts the manufacture method of tooth plate cold-rolled steel sheet, including：
Molten steel carries out continuous casting after Fruit storage and obtains continuous casting steel billet；
Continuous casting steel billet carries out hot rolling after being heated in 1100 DEG C~1200 DEG C, described hot rolling is two-part rolling mill practice, and roughing is 5
Passage tandem rolling, is rolled more than austenite recrystallization temperature, and roughing end temp is 1000 DEG C~1080 DEG C；Finish rolling is 7 passages
Tandem rolling, in the non-recrystallization temperature interval rolling of austenite, finish rolling end temp is 810 DEG C~850 DEG C, and section cooling is adopted after finish rolling
Cold by force with leading portion, coiling temperature batches to obtain coils of hot-rolled steel when being 540 DEG C~580 DEG C；
Coils of hot-rolled steel again uncoiling, through pickling, cold rolling, cold rolling reduction ratio is 10%~20%, bell-type annealing furnace annealing, annealing temperature
Spend for 710 DEG C~740 DEG C, annealing time is 10h~15h, batch and obtain thickness for 3.2mm~10.8mm finished steel plates.
3. precision stamping automotive seat as claimed in claim 2 adjusts the manufacture method of tooth plate cold-rolled steel sheet, its feature exists
In convexity≤60um of finishing rolling control hot rolled steel plate.
4. precision stamping automotive seat as claimed in claim 2 adjusts the manufacture method of tooth plate cold-rolled steel sheet, its feature exists
In after finish rolling, hot rolled steel plate thickness is 4mm~12mm.
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| CN107385348A (en) * | 2016-05-16 | 2017-11-24 | 上海梅山钢铁股份有限公司 | A kind of precision stamping cold-rolled steel sheet and its manufacture method |
| CN106086350B (en) * | 2016-08-29 | 2018-02-16 | 湖北大帆金属制品有限公司 | A kind of processing technology of strip |
| CN106391759A (en) * | 2016-10-14 | 2017-02-15 | 河钢股份有限公司邯郸分公司 | Production method for alleviating transverse bends of thick-specification cold-rolled plate |
| CN109112398B (en) * | 2018-08-29 | 2020-10-30 | 承德建龙特殊钢有限公司 | Chromium-containing alloy bar and preparation method thereof |
| CN111979395A (en) * | 2020-07-29 | 2020-11-24 | 苏州翔楼新材料股份有限公司 | Method for processing cold-rolled steel strip for knife saw |
| CN112474822B (en) * | 2020-12-10 | 2023-06-02 | 安阳钢铁股份有限公司 | Cold continuous rolling production process for medium carbon steel |
| CN115478223B (en) * | 2022-09-27 | 2023-06-13 | 首钢集团有限公司 | Cold-rolled fine-stamped steel strip and preparation method thereof |
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| JP2007270329A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Manufacturing method of steel plate having excellent fine blanking workability |
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