CN108385019A - A kind of automobile child seat locking device cold rolling fine steel band and preparation method - Google Patents
A kind of automobile child seat locking device cold rolling fine steel band and preparation method Download PDFInfo
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- CN108385019A CN108385019A CN201810048364.5A CN201810048364A CN108385019A CN 108385019 A CN108385019 A CN 108385019A CN 201810048364 A CN201810048364 A CN 201810048364A CN 108385019 A CN108385019 A CN 108385019A
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- cold rolling
- steel band
- locking device
- child seat
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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
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
- C21D8/0236—Cold rolling
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
-
- 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
-
- 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
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a kind of automobile child seat locking device cold rolling fine steel band, the material of cold rolling fine steel band is 51CrV4, and according to mass percent meter, the ingredient of the cold rolling fine steel band includes：C：0.50 0.55, Si:0.15 0.35, Mn 0.80 1.10, P≤0.015, S≤0.01, Cr 0.90 1.20, V 0.10 0.20, Al≤0.035.The present invention is for the special processing technology and application requirement of children's seat locking device, reasonably optimizing 51CrV4 chemical compositions, is rationally controlled for the elemental compositions such as the C of hydrogen embrittlement sensible factor, S, P Si.
Description
Technical field
The present invention relates to steel band preparation fields, and in particular to a kind of automobile child seat locking device cold rolling fine steel band
And preparation method.
Background technology
Safety seat is exactly children's design that one kind aiming at different weight (or age bracket), is mounted in automobile, can be effective
Improve the seat of children riding safety.In car crass or in the case of slow down suddenly, it is possible to reduce to the stamping press of children and
The body movement of limiting child is to mitigate the injury to them.The estimated Children in China emergency seat in 2017 of Zhong Shang industrial research institute
Chair yield will be up to 16,080,000.
Safety chair seats of car for children spare and accessory parts are mainly：Seat body, locking device, safe buckle, ribbon, ISOFIX connect
Mouthful, wherein seat body manufacture level is the important embodiment of child safety seat enterprise product manufacturing level.Due to children
Children are protected in seat major requirement in automobile stall or collision, therefore locking system are required high.European Union and North America phase
It closes tissue to be required to, seat instantaneous impact requires more than 2100 pounds (about 9341N).
Related components manufacturing enterprise of the country at present, the material of selection are the spheroidal annealing of cold rolled state material of Taiwan import
S50C, year, import volume was up to 4000 tons.Hardness, can anti-certain impact toughness up to HRC42-46 after quenching.But the part is due to warp
It needs to be heat-treated (+390 DEG C of tempering of 850 DEG C of quenchings) after punching press, and is electroplated, inevitably by hydrogen embrittlement
It influences, causes to crack during component test.
Invention content
The technical problem to be solved in the present invention is to provide a kind of automobile child seat locking device cold rolling fine steel band and
Preparation method, for children's seat locking device special processing technology and application requirement, reasonably optimizing 51CrV4 chemical compositions,
It is rationally controlled for the elemental compositions such as the C of hydrogen embrittlement sensible factor, S, P Si.
In order to solve the above technical problem, the present invention provides a kind of automobile child seat locking device cold rolling fine steel
The material of band, cold rolling fine steel band is 51CrV4, and according to mass percent meter, the ingredient of the cold rolling fine steel band includes：
C：0.50-0.55, Si:0.15-0.35, Mn 0.80-1.10, P≤0.015, S≤0.01, Cr 0.90-1.20, V
0.10-0.20, Al≤0.035.
In a preferred embodiment of the present invention, further comprise, a kind of automobile child seat locking device cold rolling
The preparation method of fine steel band, includes the following steps：
S 10 takes coils of hot-rolled steel, and surface oxide layer, then slitting are removed through overpickling；
Coil of strip after slitting is carried out rough annealing by S 20；
Steel material after annealing is carried out small variable cold rolling by S 30；
Base is annealed during S 40 carries out the steel band after the completion of cold rolling in S30；
Materials of the S 50 after the annealing of middle base carries out finished product cold rolling；
Steel band after 50 cold rollings of S is carried out finished products by S 60；
The smooth slitting of 70 finished products of S.
In a preferred embodiment of the present invention, further comprise, rough annealing is to be heat-treated for the first time in S 20, packet
Include following steps：
S 101 is heated to 250 DEG C and keeps the temperature 2 hours, removes the moisture greasy dirt of steel strip surface, it is ensured that then interior vacuum degree is rushed
Enter hydrogen, it is ensured that the concentration and purity of protective gas in stove prevent steel strip surface decarburization and oxidation during annealing heat-treats；
S 102 is heated to 720 DEG C and keeps the temperature 14 hours, carries out recrystallization processing at a lower temperature；
S 103 is cooled to 580 DEG C, slings outer cover, accelerates to reduce in-furnace temperature；
S104 is cooled to 270 DEG C, in interior cover outer wall surface water spray, accelerates cooling, 70 DEG C are come out of the stove.
In a preferred embodiment of the present invention, further comprise, the cold rolling in S 30 includes the following steps：
Steel material after annealing carries out small variable cold rolling, including five cold rollings, first of cold rolling and second cold rolling steel
Expect that gauge variation is 0.4, second cold rolling is 0.3 with third road cold-rolled steel material thickness variable, third road cold rolling and the 4th
Cold-rolled steel material thickness variable is 0.3, and the 4th cold rolling is 0.2 with the 5th cold-rolled steel material thickness variable.
In a preferred embodiment of the present invention, further comprise,
The middle base of S 40 is annealed into second of heat treatment, includes the following steps：
S 401 is heated to 250 DEG C and keeps the temperature 2 hours, removes the moisture greasy dirt of steel strip surface, it is ensured that then interior vacuum degree is rushed
Enter hydrogen, it is ensured that the concentration and purity of protective gas in stove；
S 402 is heated to 700 DEG C and keeps the temperature 14 hours, carries out recrystallization processing at a lower temperature；
S 403 is cooled to 580 DEG C, then hangs outer cover, accelerates to reduce in-furnace temperature；
S 404 is cooled to 270 DEG C, in interior cover outer wall surface water spray, accelerates cooling, 70 DEG C are come out of the stove.
In a preferred embodiment of the present invention, further comprise,
Cold-rolling process in S 50 includes：Steel material gauge variation is 0.3 between 6th cold rolling and the 5th cold rolling, the
Steel material gauge variation is 0.2 between seven cold rollings and the 6th cold rolling, Steel material between the 8th cold rolling and the 7th cold rolling
Gauge variation is 0.2, and Steel material gauge variation is 0.2 between the 9th cold rolling and the 8th cold rolling.
In a preferred embodiment of the present invention, further comprise, finished products are that third time is heat-treated in S 60, packet
Include following steps：
S 601 is heated to 250 DEG C and keeps the temperature 2 hours, removes the moisture greasy dirt of steel strip surface, it is ensured that then interior vacuum degree is rushed
Enter hydrogen, it is ensured that the concentration and purity of protective gas in stove；
S 602 is heated to 680 DEG C and keeps the temperature 14 hours, carries out recrystallization processing at a lower temperature；
S 603 hangs outer cover after being cooled to 580 DEG C, accelerate to reduce in-furnace temperature；
S 604 is cooled to 270 DEG C, in interior cover outer wall surface water spray, accelerates cooling, 70 DEG C are come out of the stove.
In a preferred embodiment of the present invention, further comprise, smooth slitting in S 70, the smooth thickness of finished product ±
0.01mm, width -0.2.
The technique effect of the present invention：
1, the component of cold rolling fine steel band of the present invention is allotted and cold rolled annealed technique, obtained 51CrV4 are organized by original
Hot rolling lamellar pearlite is changed into the graininess pearlite of small and dispersed distribution.
2, cold rolling fine steel band performance stable and uniform prepared by the present invention, is conducive to the metal flow in punching course, changes
Cross section quality after kind punching press；Quenched simultaneously using using Isothermal Bainite, the intensity of part can be improved from HRC42-46 to
HRC47-55, anti-hydrogen embrittlement time improve from 10min to 10h；Force degradation amount is less than 2% after plating；Part impact strength is from working as
Preceding 2100 pounds (9341N) are improved to 2800 pounds.
Specific implementation mode
The present invention is further explained in the light of specific embodiments, so that those skilled in the art can be preferably
Understand the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
Embodiment
One embodiment of the automobile child seat locking device cold rolling fine steel band of the present invention, the material of cold rolling fine steel band
Material is 51CrV4, and the ingredient of cold rolling fine steel band includes：
C (%)：0.50-0.55, Si (%):0.15-0.35, Mn (%)：0.80-1.10, P (%)≤0.015, S (%)
≤ 0.01, Cr (%)：0.90-1.20, V (%)：0.10-0.20, Al (%)≤0.035.
The method that automobile child seat locking device cold rolling fine steel band is prepared in the present embodiment includes the following steps：
One, coils of hot-rolled steel 4.5*1250mm*C is taken:Surface oxide layer, then slitting are removed through pickling.
Two, slitting carries out rouleau rough annealing to 4.5*234mm*C.
Specific annealing process is as follows：
1) 250 DEG C are heated to and keeps the temperature 2 hours, removes the moisture greasy dirt of steel strip surface.Ensure interior vacuum degree, then pours hydrogen
Gas, it is ensured that the concentration and purity of protective gas in stove prevent steel strip surface decarburization and oxidation during annealing heat-treats.
2) 720 DEG C are heated to and keeps the temperature 14 hours, carries out recrystallization processing at a lower temperature, it is ensured that annealing process is complete
At obtaining good microstructure and mechanical property, so that carbide is changed by sheet spherical.
3) outer cover is hung after being cooled to 580 DEG C, is accelerated to reduce in-furnace temperature, is made tissue that slight change occur.
4) 270 DEG C are cooled to, in interior cover outer wall surface water spray, accelerates cooling, 70 DEG C are come out of the stove, and organize no phase at this time
Become, save production cost, accelerates heat treatment rhythm.
Three, material carries out small variable cold rolling after annealing, and the first passage is cold-rolled to 4.1*234*C from 4.5*234*C；Second
Secondary to be cold-rolled to 3.8*234*C, third passage is cold-rolled to 3.5*234*C, and four-pass is cold-rolled to 3.2*234*C；5th passage is cold
It is rolled to 3.0*234*C.
Four, the steel band after the completion of the 5th passage cold rolling in step 3 is carried out second and is heat-treated (middle base annealing), at heat
Steps are as follows for reason：
1) 250 DEG C are heated to and keeps the temperature 2 hours, removes the moisture greasy dirt of steel strip surface.Ensure interior vacuum degree, then pours hydrogen
Gas, it is ensured that the concentration and purity of protective gas in stove prevent steel strip surface decarburization and oxidation during annealing heat-treats.
2) 700 DEG C are heated to and keeps the temperature 14 hours, carries out recrystallization processing at a lower temperature.Ensure that annealing process is complete
At obtaining good microstructure and mechanical property, so that carbide is changed by sheet spherical.
3) outer cover is hung after being cooled to 580 DEG C, is accelerated to reduce in-furnace temperature, is made tissue that slight change occur；
4) 270 DEG C are cooled to, in interior cover outer wall surface water spray, accelerates cooling, 70 DEG C are come out of the stove, and organize no phase at this time
Become, save production cost, accelerates heat treatment rhythm；
Five, material of the step 4 in after base annealing carries out finished product rolling, and rolling mill practice is the 6th passage from 3.0*234*C
It is cold-rolled to 2.7*234*C；7th passage is cold-rolled to 2.5*234*C, and the 8th passage is cold-rolled to 2.3*234*C, the 9th passage cold rolling
To 2.1*234*C.
Six, by after the completion of the 9th passage cold rolling in step 5 steel band carry out third time heat treatment (finished products), heat at
Steps are as follows for reason：
1) 250 DEG C are heated to and keeps the temperature 2 hours, removes the moisture greasy dirt of steel strip surface.Ensure interior vacuum degree, then pours hydrogen
Gas, it is ensured that the concentration and purity of protective gas in stove prevent steel strip surface decarburization and oxidation during annealing heat-treats；
2) 680 DEG C are heated to and keeps the temperature 14 hours, carries out recrystallization processing at a lower temperature.Ensure that annealing process is complete
At obtaining good microstructure and mechanical property, so that carbide is changed by sheet spherical；
3) outer cover is hung after being cooled to 580 DEG C, is accelerated to reduce in-furnace temperature, is made tissue that slight change occur；
4) 270 DEG C are cooled to, in interior cover outer wall surface water spray, accelerates cooling, 70 DEG C are come out of the stove, and organize no phase at this time
Become, save production cost, accelerates heat treatment rhythm；
Seven, the smooth slitting of finished product：Finished product is smooth to press thickness ± 0.01mm, width：- 0.2 executes, and final finished specification is
2.0*100*C。
It is as shown in table 1 that preparation method in the present embodiment is improved into quenching technical.
1 quenching technical table of table
The component of cold rolling fine steel band is allotted in the present embodiment and cold rolled annealed technique, obtained 51CrV4 are organized by original
Hot rolling lamellar pearlite be changed into small and dispersed distribution graininess pearlite.
The cold rolling fine steel band performance stable and uniform prepared in the present embodiment, is conducive to the metal flow in punching course,
Improve the cross section quality after punching press；It is quenched simultaneously using using Isothermal Bainite, the intensity of part can be improved from HRC42-46
To HRC47-55, the anti-hydrogen embrittlement time improves from 10min to 10h；Force degradation amount is less than 2% after plating；Part impact strength from
Current 2100 pounds (9341N) are improved to 2800 pounds.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
It encloses without being limited thereto.Those skilled in the art on the basis of the present invention made by equivalent substitute or transformation, in the present invention
Protection domain within.Protection scope of the present invention is subject to claims.
Claims (8)
1. the material of a kind of automobile child seat locking device cold rolling fine steel band, cold rolling fine steel band is 51CrV4, special
Sign is, according to mass percent meter, the ingredient of the cold rolling fine steel band includes：
C：0.50-0.55, Si:0.15-0.35, Mn0.80-1.10, P≤0.015, S≤0.01, Cr0.90-1.20, V0.10-
0.20, Al≤0.035.
2. a kind of preparation method of automobile child seat locking device cold rolling fine steel band, which is characterized in that including following step
Suddenly：
S10 takes coils of hot-rolled steel, and surface oxide layer, then slitting are removed through overpickling；
Coil of strip after slitting is carried out rough annealing by S20；
Steel material after annealing is carried out small variable cold rolling by S30；
Base is annealed during S40 carries out the steel band after the completion of cold rolling in S30；
Materials of the S50 after the annealing of middle base carries out finished product cold rolling；
Steel band after S50 cold rollings is carried out finished products by S60；
The smooth slitting of S70 finished products.
3. the preparation method of as claimed in claim 2 kind of automobile child seat locking device cold rolling fine steel band, feature exist
In,
Rough annealing is to be heat-treated for the first time in S20, is included the following steps：
S101 is heated to 250 DEG C and keeps the temperature 2 hours, removes the moisture greasy dirt of steel strip surface, it is ensured that then interior vacuum degree pours hydrogen
Gas, it is ensured that the concentration and purity of protective gas in stove prevent steel strip surface decarburization and oxidation during annealing heat-treats；
S102 is heated to 720 DEG C and keeps the temperature 14 hours, carries out recrystallization processing at a lower temperature；
S103 is cooled to 580 DEG C, slings outer cover, accelerates to reduce in-furnace temperature；
S104 is cooled to 270 DEG C, in interior cover outer wall surface water spray, accelerates cooling, 70 DEG C are come out of the stove.
4. the preparation method of as claimed in claim 2 kind of automobile child seat locking device cold rolling fine steel band, feature exist
In the cold rolling in S30 includes the following steps：
Steel material after annealing carries out small variable cold rolling, including five cold rollings, and first of cold rolling is thick with second cold rolling Steel material
It is 0.4 to spend variable, and second cold rolling is 0.3 with third road cold-rolled steel material thickness variable, the cold rolling of third road and the 4th cold rolling
Steel material gauge variation is 0.3, and the 4th cold rolling is 0.2 with the 5th cold-rolled steel material thickness variable.
5. the preparation method of as claimed in claim 2 kind of automobile child seat locking device cold rolling fine steel band, feature exist
In,
The middle base of S40 is annealed into second of heat treatment, includes the following steps：
S401 is heated to 250 DEG C and keeps the temperature 2 hours, removes the moisture greasy dirt of steel strip surface, it is ensured that then interior vacuum degree pours hydrogen
Gas, it is ensured that the concentration and purity of protective gas in stove；
S402 is heated to 700 DEG C and keeps the temperature 14 hours, carries out recrystallization processing at a lower temperature；
S403 is cooled to 580 DEG C, then hangs outer cover, accelerates to reduce in-furnace temperature；
S404 is cooled to 270 DEG C, in interior cover outer wall surface water spray, accelerates cooling, 70 DEG C are come out of the stove.
6. the preparation method of as claimed in claim 4 kind of automobile child seat locking device cold rolling fine steel band, feature exist
In,
Cold-rolling process in S50 includes：Steel material gauge variation is the 0.3, the 7th between 6th cold rolling and the 5th cold rolling
Steel material gauge variation is 0.2 between cold rolling and the 6th cold rolling, Steel material thickness between the 8th cold rolling and the 7th cold rolling
Variable is 0.2, and Steel material gauge variation is 0.2 between the 9th cold rolling and the 8th cold rolling.
7. the preparation method of as claimed in claim 2 kind of automobile child seat locking device cold rolling fine steel band, feature exist
In finished products are that third time is heat-treated in S60, are included the following steps：
S601 is heated to 250 DEG C and keeps the temperature 2 hours, removes the moisture greasy dirt of steel strip surface, it is ensured that then interior vacuum degree pours hydrogen
Gas, it is ensured that the concentration and purity of protective gas in stove；
S602 is heated to 680 DEG C and keeps the temperature 14 hours, carries out recrystallization processing at a lower temperature；
S603 hangs outer cover after being cooled to 580 DEG C, accelerate to reduce in-furnace temperature；
S604 is cooled to 270 DEG C, in interior cover outer wall surface water spray, accelerates cooling, 70 DEG C are come out of the stove.
8. the preparation method of as claimed in claim 2 kind of automobile child seat locking device cold rolling fine steel band, feature exist
In, smooth slitting in S70, the smooth thickness ± 0.01mm of finished product, width -0.2.
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Cited By (8)
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| CN109023138A (en) * | 2018-09-20 | 2018-12-18 | 苏州翔楼新材料股份有限公司 | A kind of automobile safety belt latching system pressure pipe cold-rolled strip DC04 heat treatment process |
| CN109702011A (en) * | 2019-03-12 | 2019-05-03 | 山东泰山钢铁集团有限公司 | A kind of tape measure 50 steel cold-rolled strip of high-precision ultra-wide and its production method |
| CN110527914A (en) * | 2019-09-25 | 2019-12-03 | 唐山汇丰钢铁有限公司 | A kind of building tie rod special-purpose steel and its production technology |
| CN111961965A (en) * | 2020-07-29 | 2020-11-20 | 苏州翔楼新材料股份有限公司 | Steel strip of cold rolling finishing fine blanking material for automobile child seat locking device |
| CN111961827A (en) * | 2020-07-29 | 2020-11-20 | 苏州翔楼新材料股份有限公司 | Manufacturing method of low-alloy low-yield-ratio cold-rolled steel strip for automobile gear shifting fork |
| CN111979394A (en) * | 2020-07-29 | 2020-11-24 | 苏州翔楼新材料股份有限公司 | Manufacturing method of thick-specification high-precision cold-rolled low-alloy high-strength steel strip |
| CN112077141A (en) * | 2020-08-21 | 2020-12-15 | 慕贝尔汽车部件（太仓）有限公司 | Steel disc spring machining process and steel disc spring |
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