CN106191682A - A kind of easy-open end draw ring cold rolling hot-dip galvanized steel sheet and production method thereof - Google Patents
A kind of easy-open end draw ring cold rolling hot-dip galvanized steel sheet and production method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of easy-open end draw ring cold rolling hot-dip galvanized steel sheet and production method thereof, mainly solve the cold rolling technical problem that hot-dip galvanized steel sheet tensile strength is low, production cost is high of existing easy-open end draw ring.A kind of cold rolling hot-dip galvanized steel sheet of easy-open end draw ring that the present invention provides, its chemical composition mass percent is: C:0.025%～0.04%, Si:0.005%～0.03%, Mn:0.26%～0.35%, P≤0.015%, S≤0.013%, Alt:0.03%～0.07%, B:0.004%～0.005%, surplus is ferrum and is unavoidably mingled with.Present invention is mainly used for making the draw ring of easy-open end.
Description
Technical field
The invention belongs to technical field of iron-base alloy, relate to a kind of cold rolling hot-dip galvanized steel sheet, particularly to a kind of easy-open end draw ring cold rolling hot-dip galvanized steel sheet and production method thereof.
Background technology
Metal packing material has the prominent features such as incrustation performance is good, intensity is high, convenient storage transport, is increasingly subject to liking of people.Canister is initially used to packaged food, one of two, three beverage can main packaged forms having become as soda pop, fruit juice, medicated beer etc. of metal.At present, although the most popular beverage can specifications and models are a lot, but its cover uses Lift-ring Type Tear-off Lid mostly.Basic demand to easy-open end draw ring is to possess higher intensity, in order to successfully the sealing of canister pulled open.Existing easy-open end draw ring many employings aluminum alloy plate materials or ferrostan are as moulding material, wherein because the intensity of aluminum alloy plate materials is relatively low, after making draw ring, in use, easily cause the problems such as draw ring damage or draw ring fracture, have impact on the normal use of user；Although the intensity of ferrostan is compared aluminum alloy plate materials and is had a distinct increment, but corrosion resistance is poor, after stamped molding, its incision gets rusty easily blackening, have a strong impact on attractive in appearance, on the other hand, it is to reduce cost material is carried out the requirement that thickness is thinning that its intensity can not adapt to modern enterprise, limited more on using.
Chinese Patent Application No. is that the patent application of CN 200910142860.8 discloses " for the surface treatment method of galvanizing colourful coating steel plate of tear-off tin pull ring "; the steel plate of this patent application publication annealing temperature in the fabrication process is higher; reach 600～700 DEG C; soaking time is the longest; it is 120～150S; cause produced armor plate strength on the low side; tensile strength is less than 425MPa; can not meet the strength demand of modern easy-open end draw ring steel, its core technology is mainly the surface treatment method of protective coating steel plate.
Chinese Patent Application No. is that the patent application of CN 200880011757.3 discloses " the press process hot-dip high-strength steel sheet of excellent in low temperature toughness and manufacture method thereof ", a kind of hot-dip high-strength steel sheet of this patent application publication and production method thereof, this hot-dip high-strength steel sheet contains by weight percentage: carbon: 0.0005～0.005%, silicon: 0.30～1.0%, manganese: 0.7～2.0%, phosphorus≤0.05%, sulfur≤0.01%, niobium: 0.01～0.04%, titanium: 0.01～0.05%, aluminum: 0.01～0.3%, boron: 0.0005～0.003%, nitrogen: 0.001～0.01%.This steel contains the elements such as higher silicon, manganese, and need to add the multiple microalloy element such as niobium, titanium in steel, relatively costly, and the tensile strength of this steel is less than 540MPa, it is impossible to meet the manufacture requirements of easy-open end draw ring.
Summary of the invention
It is an object of the invention to provide a kind of easy-open end draw ring cold rolling hot-dip galvanized steel sheet and production method thereof, mainly solve the cold rolling technical problem that hot-dip galvanized steel sheet tensile strength is low, production cost is high of existing easy-open end draw ring.
The technical solution used in the present invention is:
A kind of cold rolling hot-dip galvanized steel sheet of easy-open end draw ring, chemical composition mass percent: C:0.025%～0.04%, Si:0.005%～0.03%, Mn:0.26%～0.35%, P≤0.015%, S≤0.013%, Alt:0.03%～0.07%, B:0.004%～0.005%, surplus is Fe and inevitable impurity element.
The reason that easy-open end draw ring of the present invention limits within the above range by the chemical composition of cold rolling hot-dip galvanized steel sheet is as follows:
Carbon: C content affects the intensity of product, plasticity, punching performance.During C content height, elongation percentage is low, and forms uneven deformed area after deformation, and in recrystallization process, these deformed areas promote the forming core of random orientation recrystal grain, and { 111} reduces favorable texture accordingly, and punching performance declines.C content low cold rolled annealed after can not meet intensity, hardness requirement.Therefore, the present invention sets C content as 0.025%～0.04%；
Silicon: Si content relatively low in steel, is on the one hand conducive to the coating performance that product is follow-up, and on the other hand, product has required higher Al content, is independent of Si element deoxidation.Therefore, the present invention sets Si content as 0.005～0.03%；
Manganese: the Mn mainly strengthening of the effect in steel and the effect of the further adverse effect eliminating S, technical solution of the present invention sets Mn content as 0.26-0.35%；
Phosphorus, sulfur: P, S are all the harmful elements in steel, be intended to both control of elements in relatively low level, it is contemplated that actual process control ability and production cost in steel, and technical solution of the present invention sets P≤0.015%, S≤0.013%.
Aluminum: Al effect in steel is extremely important, Al and N combines and generates AlN, AlN obtains { 111} texture and the key factor of cheese crystal grain favourable to cold-drawn performance in annealing process, simultaneously because the fixation that AlN is to atom N, cold-reduced sheet is made to have good ageing resistance performance, therefore, the present invention sets Al content as 0.03%～0.07%.
Boron: B is the element in the periodic table of elements in second round the 3rd main group, and it has the strongest affinity with nitrogen, oxygen and carbon, and the outstanding role of boron is the quenching degree that the boron of trace just can increase steel exponentially.The various mechanical performances of boron steel, processing performance are good, and Technology for Heating Processing is simple, cheap.The resource of boron is many, and consumption is few, and from saving a large amount of expensive alloying element nickel, chromium, from the point of view of aluminum etc., boron steel just has bigger meaning and captivation.The boron of trace mainly exists in steel with solution, and at Grain Boundary Segregation, makes the crystal grain refinement in welding heat affected zone, thus improve the welding performance of steel plate, and accelerate annealing recrystallization during continuous annealing, improve the performance uniformity of continuous annealing steel plate；Exactly because B element can be favourable to the welding performance of steel with crystal grain thinning, and can reduce the generation of crackle in cold rolling hot-dip galvanized steel sheet production process of easy-open end draw ring, improve lumber recovery.Through experimentation for many years, the present invention sets B content as 0.004%～0.005%.
The above-mentioned easy-open end draw ring production method of cold rolling hot-dip galvanized steel sheet, the method includes:
Molten steel obtains continuous casting steel billet through continuous casting, the mass percent of wherein said molten steel composition is: C:0.025%～0.04%, Si:0.005%～0.03%, Mn:0.26%～0.35%, P≤0.015%, S≤0.013%, Alt:0.03%～0.07%, B:0.004%～0.005%, surplus is ferrum and is unavoidably mingled with；
The heated stove of continuous casting steel billet carries out hot rolling after being heated to 1101 DEG C～1130 DEG C, described hot rolling is two-part rolling mill practice, and roughing is 5 passage tandem rollings, rolls more than austenite recrystallization temperature, and roughing end temp is 1020～1070 DEG C；Finish rolling is 7 passage tandem rollings, roll in austenite non-recrystallization temperature district, finish rolling end temp is 840 DEG C～850 DEG C, finish rolling reduction ratio is 75%～79%, after finish rolling, steel plate thickness is 1.4～2.0mm, the section cooling stage uses back segment cooling, and coiling temperature is 550 DEG C～560 DEG C and batches and obtain coils of hot-rolled steel；
Through pickling, cold rolling, Horizontal Continuous Furnace annealing, galvanizing by dipping after coils of hot-rolled steel uncoiling again, batch that to obtain thickness be 0.29mm～0.40mm finished product, described cold rolling reduction ratio is 78%～83%, the hard state strip steel that rolls after cold rolling is 570 DEG C～580 DEG C in the soaking zone temperature that Horizontal Continuous Furnace is annealed, and strip steel is 70s～90s at the annealing time of soaking zone.
The reason of the production technology that the present invention takes is as follows:
1, the setting of continuous casting steel billet heating-up temperature
If continuous casting steel billet heating-up temperature is too high, AlN and Ti(C in steel, N) etc. second phase particles dissolve after again separate out more tiny, the precipitate of disperse in hot rolling reeling process, the recrystallization of crystal grain after cold rolling, annealing subsequently is then inhibited to grow up, the recrystallization temperature making steel plate raises, it is impossible to adapt to low annealing temperature.If heating-up temperature is too low, due to the natural temperature drop in course of hot rolling, it is impossible to ensure the finishing temperature of application claims.Continuous casting steel billet heating-up temperature is set as 1101 DEG C～1130 DEG C.
2, finish rolling end temp sets
For preventing finish rolling from rolling at two-phase section, finishing temperature need to be higher than Ar3Transformation temperature, but finishing temperature can not be the highest, otherwise must improve the heating-up temperature of continuous casting steel billet, increases energy consumption.Therefore, considering, finish rolling end temp of the present invention is set as 840 DEG C～850 DEG C.
3, hot-rolling coiling temperature sets
Hot-rolling coiling temperature is one of key factor affecting steel mechanical performance, coiling temperature has influence on the precipitation process of nitride and carbide, the precipitation of particularly AlN, the present invention uses Horizontal Continuous Furnace annealing through the strip steel rolling hard state of cold rolling acquisition, annealing temperature is relatively low, in order to the cold-reduced sheet after ensureing annealing has certain intensity, considering, the present invention sets coiling temperature as 550 DEG C～560 DEG C.
4, cold rolling reduction ratio sets
The present invention uses once cold rolling to produce, and has the advantages such as organization of production convenience, low cost, yield is high, Surface Defects in Steel Plate incidence rate is little compared with secondary cold-rolling.The main technologic parameters determining steel plate material in cold rolling process is cold rolling reduction, general purpose cold-rolling of steel plate deflection is the bigger the better, because big pressure can produce more removable dislocation, removable dislocation is the highest, resistance of deformation is the least, stress is not concentrated to crystal boundary, and to adjacent crystal grain transfer deformation, thus be not easy to produce skid wire.It addition, the deformation energy of the biggest generation of deflection is the biggest, the unstability of tissue is the highest, so recrystallization temperature is the lowest, the more fine uniform of the crystal grain after recrystallization, the intensity of steel plate and plasticity all can improve.But when cold rolling reduction ratio is more than 85%, the grain size of finished product is held essentially constant；It addition, mill load increases substantially when reduction ratio is more than 85%, and cold-rolled process less stable, easily cause production accident.The present invention carries out cold rolling on 5 Stands Cold Tandem Mills, can be effectively controlled the tension force of strip steel, by suitable cold rolling deformation, can obtain that plate shape is preferable, the satisfactory coiled sheet of yield strength.Considering, the most cold rolling reduction ratio of the present invention is 78%～83%.
5, annealing temperature sets
In order to the cold-rolled steel coils after making annealing has higher yield strength, the present invention passes through test of many times, obtain rational annealing temperature, steel band annealing temperature of soaking zone in Horizontal Continuous Furnace is set as 570～580 DEG C, strip steel is set as 70～90s in the time of soaking zone, both eliminated the residual stress of cold-rolled strip by annealing, obtain again the cold-rolled steel coils intensity of design.
The easy-open end draw ring that the present invention obtains is fibrous iron ferritic+pearlite+free cementite by the microscopic structure of cold rolling hot-dip galvanized steel sheet, grain size number is I 8～10 grades, lower yield strength Rel is 580MPa～600MPa, and tensile strength Rm is 600MPa～730MPa, elongation after fracture A50≥18%。
The present invention has following good effect compared to existing technology:
1, the present invention is by optimizing material component design, continuous casting steel billet heating and temperature control, hot rolling finishing temperature and oiler temperature control, the control of cold rolling reduction ratio, Horizontal Continuous Furnace annealing temperature and annealing time technological measure, obtaining yield strength is 580MPa～600 MPa, has the cold rolling hot-dip galvanized steel sheet of good cold-formed performance.
2, without expensive alloying elements in present component, using hot rolling cooling controlling and rolling controlling process, Horizontal Continuous Furnace annealing regulation technology to produce, production technology is simple, and production cost is low.
Accompanying drawing explanation
Fig. 1 is the easy-open end draw ring of the present invention metallographic microstructure photo by cold rolling hot-dip galvanized steel sheet embodiment 1.
Detailed description of the invention
Below in conjunction with embodiment 1-4, the invention will be further described, as shown in table 1 ~ table 4.
Table 1 chemical composition of the present invention (percentage by weight %), surplus is Fe and inevitable impurity.
| Element | C | Si | Mn | P | S | Alt | B |
| The present invention | 0.025～0.04 | 0.005～0.03 | 0.26～0.35 | ≤0.015 | ≤0.013 | 0.03～0.07 | 0.004～0.005 |
| Embodiment 1 | 0.033 | 0.015 | 0.26 | 0.015 | 0.006 | 0.056 | 0.005 |
| Embodiment 2 | 0.039 | 0.028 | 0.32 | 0.009 | 0.013 | 0.035 | 0.0041 |
| Embodiment 3 | 0.025 | 0.009 | 0.35 | 0.013 | 0.011 | 0.044 | 0.0044 |
| Embodiment 4 | 0.028 | 0.016 | 0.30 | 0.010 | 0.009 | 0.063 | 0.0049 |
Obtaining, by converter melting, the chemical composition molten steel that meets the requirements, molten steel blows Ar protection direct casting through whole process and obtains continuous casting steel billet, and thickness is 210～230mm, and width is 800～1300mm, a length of 5000～10000mm.
The scale slab of STEELMAKING PRODUCTION is delivered to heating furnace and is reheated, and delivers to roll on Continuous Heat tandem rolling mill after dephosphorization of coming out of the stove.After roughing milling train and finish rolling Continuous mill train controlled rolling, section cooling takes back segment to cool down, and then batches, output coils of hot-rolled steel.Hot rolling technology controls to be shown in Table 2.
Table 2 hot rolling technology of the present invention controls parameter
| Hot Rolling Parameters | Slab heating temperature/DEG C | Roughing end temp/DEG C | Finish rolling end temp/DEG C | Finish rolling reduction ratio/% | Coiling temperature/DEG C | Hot rolled plate thickness/mm |
| The present invention | 1101-1130 | 1020～1070 | 840-850 | 75～79 | 550～560 | 1.4-2.0 |
| Embodiment 1 | 1101 | 1022 | 850 | 76 | 555 | 2.0 |
| Embodiment 2 | 1129 | 1069 | 848 | 79 | 551 | 1.9 |
| Embodiment 3 | 1118 | 1053 | 840 | 78 | 559 | 1.6 |
| Embodiment 4 | 1110 | 1030 | 843 | 77 | 557 | 1.4 |
By above-mentioned coils of hot-rolled steel again uncoiling after overpickling, 5 Stands Cold Tandem Mills are carried out cold rolling, cold rolling reduction ratio is 78%～83%, the steel band rolling hard state after cold rolling through Horizontal Continuous Furnace annealing, galvanizing by dipping, batch and obtain the cold rolling hot-dip galvanized steel strip of finished product of thickness 0.29mm～0.40mm.Annealing process is: steel band is 570 DEG C～580 DEG C in the annealing region of the soaking zone of Horizontal Continuous Furnace, is 70s～90s in the time of soaking zone.Process control parameter is shown in Table 3.
Table 3 present invention is cold rolling, annealing regulation parameter
| Cold rolling, annealing parameter | Cold rolling reduction ratio/% | Annealing temperature/DEG C | Soaking zone time/s | Cold Rolled Plate Thickness/mm |
| The present invention | 78～83 | 570～580 | 70～90 | 0.29-0.40 |
| Embodiment 1 | 80 | 577 | 73 | 0.40 |
| Embodiment 2 | 83 | 580 | 79 | 0.32 |
| Embodiment 3 | 78 | 570 | 80 | 0.35 |
| Embodiment 4 | 79 | 573 | 85 | 0.29 |
The cold-rolled steel sheet present invention obtained carries out tension test according to " GB/T228.1-2010 metal material stretching test part 1: room temperature test method ".
Utilize the cold rolling hot-dip galvanized steel sheet of easy-open end draw ring that said method obtains.1 easy-open end draw ring is fibrous iron ferritic+pearlite+free cementite by the microscopic structure of cold rolling hot-dip galvanized steel sheet referring to the drawings, grain size number is I 8～10 grades, lower yield strength Rel is 580MPa～600MPa, and tensile strength Rm is 600MPa～730MPa, elongation after fracture A50>=18%, there is good processing characteristics simultaneously.
Utilize said method to obtain the easy-open end draw ring mechanical property of cold rolling hot-dip galvanized steel sheet and be shown in Table 4.
The mechanical property of the cold rolling hot-dip galvanized steel sheet of table 4 present invention
| Performance indications | Lower yield strength/MPa | Tensile strength/MPa | Elongation after fracture A50/% |
| The present invention | 580～600 | 600～730 | ≥18% |
| Embodiment 1 | 598 | 615 | 26 |
| Embodiment 2 | 581 | 728 | 18 |
| Embodiment 3 | 590 | 663 | 23 |
| Embodiment 4 | 592 | 688 | 20 |
In addition to the implementation, the present invention can also have other embodiments.The technical scheme that all employing equivalents or equivalent transformation are formed, all falls within the protection domain of application claims.
Claims (5)
1. the cold rolling hot-dip galvanized steel sheet of easy-open end draw ring, it is characterized in that chemical composition mass percent is: C:0.025%～0.04%, Si:0.005%～0.03%, Mn:0.26%～0.35%, P≤0.015%, S≤0.013%, Alt:0.03%～0.07%, B:0.004%～0.005%, surplus is Fe and inevitable impurity element.
2. the cold rolling hot-dip galvanized steel sheet of easy-open end draw ring as claimed in claim 1, it is organized as fibrous iron ferritic+pearlite+free cementite, and described tissue grain size is I 8～10 grades.
3. the cold rolling hot-dip galvanized steel sheet of easy-open end draw ring as claimed in claim 1 or 2, itself 0.29mm～0.40mm thickness easy-open end draw ring is 580MPa～600 MPa with cold rolling hot-dip galvanized steel sheet lower yield strength Rel, tensile strength Rm is 600MPa～730MPa, elongation after fracture A50≥18%。
4. the easy-open end draw ring production method of cold rolling hot-dip galvanized steel sheet as described in as arbitrary in claim 13, including:
Molten steel obtains continuous casting steel billet through continuous casting；
The heated stove of continuous casting steel billet carries out hot rolling after being heated to 1101 DEG C～1130 DEG C, described hot rolling is two-part rolling mill practice, and roughing is 5 passage tandem rollings, rolls more than austenite recrystallization temperature, and roughing end temp is 1020～1070 DEG C；Finish rolling is 7 passage tandem rollings, rolling in austenite non-recrystallization temperature district, finish rolling end temp is 840 DEG C～850 DEG C, and finish rolling reduction ratio is 75%～79%, after finish rolling, the section cooling stage uses back segment cooling, and coiling temperature is 550 DEG C～560 DEG C and batches and obtain coils of hot-rolled steel；
Through pickling, cold rolling, Horizontal Continuous Furnace annealing, galvanizing by dipping after coils of hot-rolled steel uncoiling again, batch that to obtain thickness be 0.29mm～0.40mm finished product, described cold rolling reduction ratio is 78%～83%, the hard state strip steel that rolls after cold rolling is 570 DEG C～580 DEG C in the soaking zone temperature that Horizontal Continuous Furnace is annealed, and strip steel is 70s～90s at the annealing time of soaking zone.
5. the easy-open end draw ring production method of cold rolling hot-dip galvanized steel sheet as claimed in claim 4, is characterized in that, after hot fine rolling, controlling hot rolled steel plate thickness is 1.4～2.0mm.
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| CN111041166A (en) * | 2018-10-15 | 2020-04-21 | 上海梅山钢铁股份有限公司 | Cold-rolled steel plate for automobile silencing sheet and production method thereof |
| CN112513312A (en) * | 2018-07-30 | 2021-03-16 | 日本制铁株式会社 | Method for manufacturing hot-dip galvanized steel sheet and method for manufacturing alloyed hot-dip galvanized steel sheet |
| CN112779386A (en) * | 2019-11-05 | 2021-05-11 | 上海梅山钢铁股份有限公司 | Cold-rolled hot-dip galvanized steel plate for easy-open-end pull ring and manufacturing method thereof |
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| CN112513312A (en) * | 2018-07-30 | 2021-03-16 | 日本制铁株式会社 | Method for manufacturing hot-dip galvanized steel sheet and method for manufacturing alloyed hot-dip galvanized steel sheet |
| CN112513312B (en) * | 2018-07-30 | 2023-03-31 | 日本制铁株式会社 | Method for manufacturing hot-dip galvanized steel sheet and method for manufacturing alloyed hot-dip galvanized steel sheet |
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| CN112779386A (en) * | 2019-11-05 | 2021-05-11 | 上海梅山钢铁股份有限公司 | Cold-rolled hot-dip galvanized steel plate for easy-open-end pull ring and manufacturing method thereof |
| CN114196874A (en) * | 2020-09-18 | 2022-03-18 | 宝山钢铁股份有限公司 | 1000MPa cold-rolled super-strong steel tensile sample and manufacturing method thereof |
| CN115505817A (en) * | 2021-06-07 | 2022-12-23 | 上海梅山钢铁股份有限公司 | Production method of low-thickness low-carbon B-containing hot rolled steel plate |
| CN115491583A (en) * | 2021-06-18 | 2022-12-20 | 上海梅山钢铁股份有限公司 | Ultra-deep drawing cold rolling hot-dip aluminum-zinc steel plate and manufacturing method thereof |
| CN115491583B (en) * | 2021-06-18 | 2023-09-05 | 上海梅山钢铁股份有限公司 | Ultra-deep drawing cold-rolled hot-dip aluminum-zinc steel plate and manufacturing method thereof |
| CN116179935A (en) * | 2021-11-29 | 2023-05-30 | 上海梅山钢铁股份有限公司 | Cold-rolled steel plate with tensile strength of 360MPa for condenser tube and production method thereof |
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