CN105648322A - Low-cost extra-deep-drawing-quality cold-rolled galvanized steel strip and preparation method thereof - Google Patents
Low-cost extra-deep-drawing-quality cold-rolled galvanized steel strip and preparation method thereof Download PDFInfo
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- CN105648322A CN105648322A CN201610145962.5A CN201610145962A CN105648322A CN 105648322 A CN105648322 A CN 105648322A CN 201610145962 A CN201610145962 A CN 201610145962A CN 105648322 A CN105648322 A CN 105648322A
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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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold 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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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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
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
Abstract
The invention discloses a low-cost extra-deep-drawing-quality cold-rolled galvanized steel strip and a preparation method thereof. The steel strip is prepared from, by mass percent, 0.001% to 0.005% of C, 0.07% to 0.12% of Mn, not larger than 0.012% of S, not larger than 0.012% of P, not larger than 0.03% of Si, 0.010% to 0.060% of Als, not larger than 0.0040% of N, 0.0015% to 0.0030% of B and the balance Fe and inclusion within an allowed range. According to the galvanized steel strip, the reasonable carbon content is controlled to reduce the content of free carbon in steel as much as possible; and meanwhile, a certain amount of boron is added to fix interstitial nitrogen and part of carbon, and therefore the timeliness of an extra-deep-drawing-quality galvanized product can be guaranteed. According to the galvanized steel strip, boron is used for fixing carbon atoms, so that the cost of an alloy material is greatly reduced, meanwhile, the heating temperature and soaking temperature of a galvanization procedure can be greatly reduced, and therefore production difficulty and energy consumption are effectively lowered.
Description
Technical field
The present invention relates to a kind of galvanized steel strip, especially a kind of low cost ultra-deep rushes level cold-rolling galvanization steel band and preparation method thereof.
Background technology
Along with also being developed rapidly of the progress of steel and iron industry, household electrical appliances and other machinery manufacturing industry, along with people are more and more higher to Product processing formability and corrosion proof requirement, the consumption that ultra-deep rushes level galvanizing production is increasing. Particularly in household electrical appliances, automobile and other industries. Owing to household electrical appliances, automobile are subject to the restriction of haul distance and process-cycle thereof, it is necessary to assure gap-free atom in steel, thus ensureing the ageing of steel and formability.
It is by adding a certain amount of niobium or titanium in steel that current most ultra-deep rushes level galvanizing production, or niobium titanium compound fixes the interstitial atom in steel such as carbon, nitrogen etc. So owing to niobium or titanium are costly, ultra-deep so can be caused to rush the cost of material of galvanizing production will substantially 120��150 yuan/ton (each steel-making level different cause cost variant). Niobium titanium also has important effect to be exactly crystal grain thinning except the atom of fixed interval (FI), raises recrystallization temperature simultaneously; This to result in the strip steel heating-up temperature in follow-up zinc-plated operation and soaking temperature is typically in about 820 DEG C, even higher; Temperature height causes production ultra-deep to rush the energy consumption just height of level galvanizing production, if rhythm of production goes out some problems and easily causes high temperature broken belt, causes production difficulty significantly high.
Production ultra-deep so being made to rush the overall cost of level galvanizing production very big, production difficulty is also very big, makes the ultra-deep on market rush the price of level galvanizing production far above general commercial level galvanizing production.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of low cost ultra-deep and rushes level cold-rolling galvanization steel band; Present invention also offers the preparation method that the low cost ultra-deep of a kind of low energy consumption rushes level cold-rolling galvanization steel band.
For solving above-mentioned technical problem, the weight/mass percentage composition of steel band chemical composition of the present invention is: C0.001��0.005%, Mn0.07��0.12%, S��0.012%, P��0.012%, Si��0.03%, Als0.010��0.060%, N��0.0040%, B0.0015��0.0030%, all the other are being mingled with in Fe and allowed band.
Thickness of strips of the present invention is 0.4��2.5mm.
The inventive method includes hot rolling, cold rolling and zinc-plated operation, described zinc-plated operation: the heating-up temperature of strip steel is 640��740 DEG C, and soaking temperature is 640��740 DEG C.
In zinc-plated operation of the present invention, strip steel is cooled to 460��490 DEG C and enters zinc pot.
Hot-rolled process of the present invention: the heating-up temperature of steel billet 1100��1200 DEG C, is incubated 1��2 hour, and finishing temperature is at 890��910 DEG C; Refrigerating mode adopts leading portion cooling, coiling temperature 700��730 DEG C.
Cold rolling process of the present invention: cold-rolled compression ratio is 60%��85%.
In zinc-plated operation of the present invention, line speed is 80��100m/min, and the breaking elongation of finishing straightening is 0.65%��1.2%.
Adopt and have the beneficial effects that produced by technique scheme: the present invention is by controlling rational carbon content, try one's best the content of the free carbon reduced in steel, simultaneously by adding a certain amount of boron, fix interstitial atom nitrogen and the carbon of part, so can ensure that ultra-deep rushes the ageing of level galvanizing production. The present invention uses boron to fix carbon atom, is substantially reduced alloy material cost, the heating-up temperature of zinc-plated operation and soaking temperature can be made to be substantially reduced, thus significantly reducing production difficulty and energy consumption simultaneously.
The heating of zinc-plated operation in the inventive method, being substantially reduced of soaking temperature, the heating of strip steel, soaking temperature are lower than the heating of general mill run, soaking temperature, it is substantially reduced the consumption of the energy, simultaneously because temperature reduces, reduce the risk of high temperature broken belt, make the processing cost of zinc-plated operation and processing risk be preferably minimized. Therefore, the feature such as the inventive method has low energy consumption, cost space is big, production difficulty is low and Product processing is functional.
The inventive method is by effectively controlling carbon content, the Boron contents in steel and coordinating rational hot rolling technology, cold rolling and zincincation, it is ensured that product has significantly high punching performance, and production cost relatively adds niobium, the cost of titanium is substantially reduced, and substantially ton steel reduces about 50 yuan. The present invention coordinates rational chemical composition and hot rolling technology to make zinc-plated annealing temperature greatly reduce, and reduces production risk, saves energy and reduce the cost simultaneously, so can be greatly enhanced the competitiveness of product in market, creates considerable economic benefit for enterprise. The inventive method is by higher hot-rolling coiling temperature, it is ensured that the grain size of hot rolling raw produce is further ensured that the performance of hot rolling, and structural homogenity is good simultaneously, so ensure that the cost of alloy of hot rolling raw material is substantially reduced. The ultra-deep that the inventive method is produced rushes the performance of level galvanizing production and surface is all equal to conventional ultra-deep and rushes level galvanizing production.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
Embodiment 1: this low cost ultra-deep is rushed the preparation method of level cold-rolling galvanization steel band and adopted following concrete technology.
Strand (steel billet) chemical composition (wt): C0.0018%, Mn0.12%, S0.007%, P0.012%, Si0.01%, Als0.046%, N0.0035%, B0.0020%, all the other are being mingled with in Fe and allowed band.
Hot-rolled process: slab heating temperature 1150 DEG C, soaking (insulation) time 2 h, finishing temperature 900 DEG C, cooling adopts leading portion cooling, coiling temperature 720 DEG C. Hot Rolling Strip specification is 2.75 �� 1020mm, and performance is: tensile strength 293MPa, yield strength 192MPa, elongation percentage 49.5%.
Cold rolling process: cold rolling thickness is 0.5 �� 1000mm, compression ratio is 81.8%.
Zinc-plated operation: line speed is 100m/min, the heating-up temperature of strip steel is 707 DEG C, the soaking temperature of strip steel 707 DEG C; Strip steel enters zinc pot temperature 465 DEG C; The breaking elongation of finishing straightening is 0.7%; Other parameter is identical with the operational factor of common galvanizing production. The performance of this cold-rolling galvanization strip product is: yield strength 169MPa, tensile strength 297MPa, A8044.0%, n value 0.23, R value 2.05.
Embodiment 2: this low cost ultra-deep is rushed the preparation method of level cold-rolling galvanization steel band and adopted following concrete technology.
Strand (steel billet) chemical composition (wt): C0.0010%, Mn0.10%, S0.007%, P0.011%, Si0.01%, Als0.048%, N0.0022%, B0.0023%, all the other are being mingled with in Fe and allowed band.
Hot-rolled process: slab heating temperature 1150 DEG C, soaking (insulation) time 2 h, finishing temperature 900 DEG C, cooling adopts leading portion cooling, coiling temperature 717 DEG C. Hot Rolling Strip specification is 3.0 �� 1020mm, and performance is: tensile strength 304MPa, yield strength 221MPa, elongation percentage 42.5%.
Cold rolling process: cold rolling thickness is 0.6 �� 1000mm, compression ratio is 80%.
Zinc-plated operation: line speed is 100m/min, the heating-up temperature of strip steel is 720 DEG C, the soaking temperature of strip steel 720 DEG C; Strip steel enters zinc pot temperature 465 DEG C; The breaking elongation of finishing straightening is 0.8%; Other parameter is identical with the operational factor of common galvanizing production. The performance of this cold-rolling galvanization strip product is: yield strength 158MPa, tensile strength 292MPa, A8042.5%, n value 0.20, R value 2.2.
Embodiment 3: this low cost ultra-deep is rushed the preparation method of level cold-rolling galvanization steel band and adopted following concrete technology.
Strand (steel billet) chemical composition (wt): C0.0020%, Mn0.10%, S0.007%, P0.011%, Si0.01%, Als0.044%, N0.0027%, B0.0022%, all the other are being mingled with in Fe and allowed band.
Hot-rolled process: slab heating temperature 1150 DEG C, soaking (insulation) time 2 h, finishing temperature 900 DEG C, cooling adopts leading portion cooling, coiling temperature 720 DEG C. Hot Rolling Strip specification is 4.0 �� 1020mm, and performance is: tensile strength 293MPa, yield strength 192MPa, elongation percentage 49.5%.
Cold rolling process: cold rolling thickness is 1.2 �� 1000mm, compression ratio is 80%.
Zinc-plated operation: line speed is 100m/min, the heating-up temperature of strip steel is 680 DEG C, the soaking temperature of strip steel 680 DEG C; Strip steel enters zinc pot temperature 460 DEG C; The breaking elongation of finishing straightening is 0.85%; Other parameter is identical with the operational factor of common galvanizing production. The performance of this cold-rolling galvanization strip product is: yield strength 174MPa, tensile strength 297MPa, A8042.0%, n value 0.20, R value 2.05.
Embodiment 4: this low cost ultra-deep is rushed the preparation method of level cold-rolling galvanization steel band and adopted following concrete technology.
Strand (steel billet) chemical composition (wt): C0.0020%, Mn0.10%, S0.008%, P0.010%, Si0.01%, Als0.045%, N0.0021%, B0.0021%, all the other are being mingled with in Fe and allowed band.
Hot-rolled process: slab heating temperature 1150 DEG C, soaking (insulation) time 2 h, finishing temperature 900 DEG C, cooling adopts leading portion cooling, coiling temperature 720 DEG C. Hot Rolling Strip specification is 5 �� 1020mm, and performance is: tensile strength 302MPa, yield strength 231MPa, elongation percentage 41.0%.
Cold rolling process: cold rolling thickness is 1.5 �� 1000mm, compression ratio is 70%.
Zinc-plated operation: line speed is 100m/min, the heating-up temperature of strip steel is 660 DEG C, the soaking temperature of strip steel 660 DEG C; Strip steel enters zinc pot temperature 465 DEG C; The breaking elongation of finishing straightening is 1.0%; Other parameter is identical with the operational factor of common galvanizing production. The performance of this cold-rolling galvanization strip product is: yield strength 186MPa, tensile strength 295MPa, A8041.0%, n value 0.22, R value 2.0.
Embodiment 5: this low cost ultra-deep is rushed the preparation method of level cold-rolling galvanization steel band and adopted following concrete technology.
Strand (steel billet) chemical composition (wt): C0.0020%, Mn0.09%, S0.006%, P0.011%, Si0.01%, Als0.048%, N0.0025%, B0.0022%, all the other are being mingled with in Fe and allowed band.
Hot-rolled process: slab heating temperature 1150 DEG C, 1 hour soaking (insulation) time, finishing temperature 890 DEG C, cooling adopts leading portion cooling, coiling temperature 720 DEG C. Hot Rolling Strip specification is 6.0 �� 1020mm, and performance is: tensile strength 290MPa, yield strength 207MPa, elongation percentage 44.0%.
Cold rolling process: cold rolling thickness is 1.8 �� 1000mm, compression ratio is 70%.
Zinc-plated operation: line speed is 100m/min, the heating-up temperature of strip steel is 640 DEG C, the soaking temperature of strip steel 660 DEG C; Strip steel enters zinc pot temperature 465 DEG C; The breaking elongation of finishing straightening is 1.2%; Other parameter is identical with the operational factor of common galvanizing production. The performance of this cold-rolling galvanization strip product is: yield strength 195MPa, tensile strength 303MPa, A8041.0%, n value 0.22, R value 2.15.
Embodiment 6: this low cost ultra-deep is rushed the preparation method of level cold-rolling galvanization steel band and adopted following concrete technology.
Strand (steel billet) chemical composition (wt): C0.0030%, Mn0.07%, S0.007%, P0.008%, Si0.01%, Als0.034%, N0.0030%, B0.0023%, all the other are being mingled with in Fe and allowed band.
Hot-rolled process: slab heating temperature 1100 DEG C, soaking (insulation) time 2 h, finishing temperature 900 DEG C, cooling adopts leading portion cooling, coiling temperature 730 DEG C. Hot Rolling Strip specification is 6.25 �� 1020mm, and performance is: tensile strength 313MPa, yield strength 234MPa, elongation percentage 43.5%.
Cold rolling process: cold rolling thickness is 2.5 �� 1000mm, compression ratio is 60%.
Zinc-plated operation: line speed is 80m/min, the heating-up temperature of strip steel is 740 DEG C, the soaking temperature of strip steel 740 DEG C; Strip steel enters zinc pot temperature 470 DEG C; The breaking elongation of finishing straightening is 1.2%. Other parameter is identical with the operational factor of common galvanizing production. The performance of this cold-rolling galvanization strip product is: yield strength 178MPa, tensile strength 299MPa, A8040.0%, n value 0.23, R value 2.05.
Embodiment 7: this low cost ultra-deep is rushed the preparation method of level cold-rolling galvanization steel band and adopted following concrete technology.
Strand (steel billet) chemical composition (wt): C0.0050%, Mn0.08%, S0.012%, P0.008%, Si0.02%, Als0.010%, N0.0040%, B0.0015%, all the other are being mingled with in Fe and allowed band.
Hot-rolled process: slab heating temperature 1200 DEG C, 1.5 hours soaking (insulation) time, finishing temperature 910 DEG C, cooling adopts leading portion cooling, coiling temperature 710 DEG C. Hot Rolling Strip specification is 2.7 �� 1020mm, and performance is: tensile strength 320MPa, yield strength 237MPa, elongation percentage 46.5%.
Cold rolling process: cold rolling thickness is 0.4 �� 1000mm, compression ratio is 85.0%.
Zinc-plated operation: line speed is 100m/min, the heating-up temperature of strip steel is 700 DEG C, the soaking temperature of strip steel 700 DEG C; Strip steel enters zinc pot temperature 480 DEG C; The breaking elongation of finishing straightening is 0.65%. Other parameter is identical with the operational factor of common galvanizing production. The performance of this cold-rolling galvanization strip product is: yield strength 185MPa, tensile strength 297MPa, A8040.85%, n value 0.21, R value 2.1.
Embodiment 8: this low cost ultra-deep is rushed the preparation method of level cold-rolling galvanization steel band and adopted following concrete technology.
Strand (steel billet) chemical composition (wt): C0.0040%, Mn0.11%, S0.009%, P0.008%, Si0.03%, Als0.060%, N0.0032%, B0.0030%, all the other are being mingled with in Fe and allowed band.
Hot-rolled process: slab heating temperature 1150 DEG C, 1.5 hours soaking (insulation) time, finishing temperature 900 DEG C, cooling adopts leading portion cooling, coiling temperature 700 DEG C. Hot Rolling Strip specification is 2.0 �� 1020mm, and performance is: tensile strength 318MPa, yield strength 227MPa, elongation percentage 47.0%.
Cold rolling process: cold rolling thickness is 0.6 �� 1000mm, compression ratio is 70.0%.
Zinc-plated operation: line speed is 90m/min, the heating-up temperature of strip steel is 640 DEG C, the soaking temperature of strip steel 640 DEG C; Strip steel enters zinc pot temperature 490 DEG C; The breaking elongation of finishing straightening is 0.65%. Other parameter is identical with the operational factor of common galvanizing production. The performance of this cold-rolling galvanization strip product is: yield strength 182MPa, tensile strength 301MPa, A8041.5%, n value 0.22, R value 2.15.
Claims (6)
1. a low cost ultra-deep rushes level cold-rolling galvanization steel band, it is characterized in that, the weight/mass percentage composition of described steel band chemical composition is: C0.001��0.005%, Mn0.07��0.12%, S��0.012%, P��0.012%, Si��0.03%, Als0.010��0.060%, N��0.0040%, B0.0015��0.0030%, all the other are being mingled with in Fe and allowed band.
2. low cost ultra-deep according to claim 1 rushes level cold-rolling galvanization steel band, it is characterised in that: described thickness of strips is 0.4��2.5mm.
3. the preparation method that low cost ultra-deep described in claim 1 or 2 rushes level cold-rolling galvanization steel band, it includes hot rolling, cold rolling and zinc-plated operation, it is characterised in that described zinc-plated operation: the heating-up temperature of strip steel is 640��740 DEG C, and soaking temperature is 640��740 DEG C.
4. the preparation method that low cost ultra-deep according to claim 3 rushes level cold-rolling galvanization steel band, it is characterised in that: in described zinc-plated operation, strip steel is cooled to 460��490 DEG C and enters zinc pot.
5. the preparation method that low cost ultra-deep according to claim 3 rushes level cold-rolling galvanization steel band, it is characterised in that described hot-rolled process: the heating-up temperature of steel billet 1100��1200 DEG C, is incubated 1��2 hour, and finishing temperature is at 890��910 DEG C; Refrigerating mode adopts leading portion cooling, coiling temperature 700��730 DEG C.
6. the preparation method that the low cost ultra-deep according to claim 3,4 or 5 rushes level cold-rolling galvanization steel band, it is characterised in that described cold rolling process: cold-rolled compression ratio is 60%��85%.
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| CN107058881A (en) * | 2017-04-17 | 2017-08-18 | 唐山钢铁集团有限责任公司 | Inexpensive cold-rolling galvanization steel band suitable for color coating and preparation method thereof |
| CN107190205A (en) * | 2017-06-29 | 2017-09-22 | 唐山钢铁集团有限责任公司 | A kind of grain coarsening, the cold-rolling galvanization steel band of high-elongation and its production method |
| CN107604141A (en) * | 2017-08-21 | 2018-01-19 | 河钢股份有限公司邯郸分公司 | A kind of anti-mild steel two applies two production methods for drying color coating timeliness |
| CN108265230A (en) * | 2018-01-12 | 2018-07-10 | 唐山钢铁集团有限责任公司 | The high strength steel band and its production method of a kind of no timeliness of household electrical appliances |
| CN110343959A (en) * | 2019-07-25 | 2019-10-18 | 首钢集团有限公司 | A kind of ultra-deep rushes hot-galvanized steel and preparation method thereof |
| CN112149272A (en) * | 2020-08-12 | 2020-12-29 | 唐山钢铁集团高强汽车板有限公司 | Cold-rolled steel strip mechanical property prediction model based on multiple linear regression analysis |
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Effective date of registration: 20190530 Address after: 063000 Tangshan Modern Equipment Manufacturing Industrial Zone, Kaiping District, Tangshan City, Hebei Province Co-patentee after: Tangshan Iron and Steel Group Co., Ltd. Patentee after: Tangshan Iron and Steel Group High Strength Automobile Plate Co., Ltd. Co-patentee after: River steel Limited by Share Ltd Tangshan branch Address before: No. 9, Riverside Road, North District of Tangshan City Road, Hebei Province, Hebei Patentee before: Tangshan Iron and Steel Group Co., Ltd. |