CN103952636B - Cold rolling hot dip galvanizing hot-strip production technology - Google Patents
Cold rolling hot dip galvanizing hot-strip production technology Download PDFInfo
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Abstract
The present invention relates to a kind of cold rolling hot dip galvanizing hot-strip production technology.Its special feature is by bessemerizing and ladle argon-blown control molten steel composition: C content 0.06%～0.09%, Mn content 0.35%～0.42%, S content 0.02%～0.025%, P content 0.018%～0.022%, Si content 0.1%～0.16%, Als content 0.004%～0.006%, Ni content 0.035%～0.042%, Gr content 0.027%～0.031%；By controlling hot rolling heating-up temperature 1150 DEG C～1250 DEG C, finish rolling start rolling temperature 1000 ± 20 DEG C, finishing temperature 900 DEG C～920 DEG C, coiling temperature 600 DEG C～640 DEG C.The present invention realizes under the conditions of without refining furnace, while reducing desulfurization, dephosphorization, decarburization intensity, makes product have preferable cold rolling physical property and excellent hot dip performance.
Description
Technical field
The present invention relates to band steel production technology, a kind of by optimizing molten steel composition, strengthening rolling control cold control heat, producing there is the cold rolling hot dip galvanizing hot-strip production technology of excellent galvanizing performance.
Background technology
In recent years, galvanized steel plain sheet is widely used in the fields such as household electrical appliance, office machine, steel furniture, for improving dicoration, while requiring to have good coating performance, requires to gradually step up for relatively thin zinc layer, and this also becomes the difficult point of zinc-plated operation.Correlative study shows, base steel chemical composition, belt steel surface form are that impact produces thin hot-dip galvanized steel strip key factor.So, hot-strip enterprise is devoted to research by regulation raw material mix, control composition of steel, optimization hot rolling technology, physical property well hot-strip reasonable for cold-rolling galvanization production composition always.
Hereinafter quote from is Some Domestic production cold-rolled steel technique Patent data:
The technique (publication number CN1587431A) of a kind of CSP production cold-rolled steel and one cold rolling hot rolling medium-width strip steel production process (publication number CN102941227A) are all by changing the technique that each procedure technology parameter produces cold-rolled steel.In a kind of CSP produces the technique of cold-rolled steel, molten steel P≤0.15% content is higher, and C≤0.05% is on the low side in addition, easily causes phosphorus to increase in the segregation of crystal boundary, reduces crystal boundary reactivity.Two kinds of techniques all have refining furnace to assist simultaneously, improve production cost.
Hereinafter quote from is Some Domestic research data:
" the metal world " 04 phase in 2013, requiring Si≤0.05% in the zinc-plated composition of steel of structural level and hot rolling performance optimization, P and S is the lowest." steel rolling " 01 phase in 2000, galvanizing influence factor summary requires C content 0.05%～0.15%, Si≤0.03%, Als≤0.02%, Cu≤0.15%, P≤0.15%." material heat treatment technology " 02 phase in 2011, iron and steel component and additive element require containing C content 0.05%～0.15%, Si≤0.06%, P≤0.15%, Cu≤0.3% in the impact of the performance of galvanizing tissue.In the case of simply indicating low silicon in above-mentioned article, zinc-plated impact, the optimal components research corresponding for other elements during Si content >=0.1 are had no resolution by each composition so far.
Summary of the invention
It is desirable to provide a kind of suitable cold-rolling galvanization hot-strip production technology, especially by optimizing molten steel composition, strengthening rolling control cold control heat, produce the band steel with excellent galvanizing performance.
The present invention is achieved by the following technical solutions:
A kind of cold rolling hot dip galvanizing hot-strip production technology, is carried out according to the following step:
A. converter operation:
Blowing: iron block 57～60Kg/t, slag 4～5Kg/t, molten iron 1000～1005Kg/t, opens and blows addition lime 18～22Kg/t, dolomite 12～14Kg/t, blows 5 minutes, adds lime 9～11Kg/t, dolomite 6～7Kg/t, blows 9～12 minutes, sintering deposit 2.6～3.1Kg/t；Terminal composition: C content 0.06%～0.09%, Mn content 0.1%～0.15%, S content 0.018%～0.022%, P content 0.01%～0.017%, Si content 0.01%～0.02%；
Tapping: tap 30 seconds, adds ferrosilicon 0.85～1.0Kg/t, ferromanganese 5.2～5.6Kg/t, ferro-silico aluminium 0.85～0.95Kg/t, Si-Al-Ba-Ca 0.35～0.40Kg/t, control composition is at C content 0.06%～0.09%, Mn content 0.35%～0.42%, S content 0.02%～0.025%, P content 0.018%～0.022%, Si content 0.1%～0.16%, Als content 0.004%-0.006%, Ni content 0.035%～0.042%, Gr content 0.027%～0.032%；
B. Argon: 6 minutes ladle argon-blown time, be simultaneously introduced silicon-calcium wire 0.45-0.65Kg/t；
C. continuous casting: tundish temperature 1540 DEG C-1560 DEG C, coverture 0.7-0.75Kg/t, covering slag 0.4～0.45Kg/t, pouring basket liquid level >=400mm, thickness of slag layer >=60mm, pulling rate 1.0～1.2m/min；
D. hot rolling: heating-up temperature 1200 DEG C～1250 DEG C, finish rolling start rolling temperature 1000 ± 20 DEG C, finishing temperature
900 DEG C～920 DEG C, coiling temperature 600 DEG C～640 DEG C.
Using the present invention of technique scheme, relatively cold-rolling galvanization strip steel hot rolling process known to other has the advantage that
1. molten steel terminal composition C content 0.06%～0.09%, while improving downstream coating resistance to chalking, the technique of more general C content 0.03%～0.06% reduces decarburization intensity, reduces production cost, improves productivity ratio.
2. ladle argon-blown, hello the silk of 6 minutes substitutes 30 minutes refining furnace operations, reduces power cost, improves productivity ratio.
The most excellent control cold control hot rolling process, band steel correspondence cold-rolled products physical property is good.
4. the composition proportion of science, while hot dip coating performance is good, it is achieved ultra-thin zinc-plated.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, and purpose is only that and is better understood from present invention.Therefore, the cited case not limits the scope of the invention.
In following embodiment, converter is 80t, and steel grade is Q195 series, and base type is 165*280, and hot-rolling mill is 650mm.
Each embodiment see table:
The band steel finished product produced by above-described embodiment is demonstrated by physical property and coating performance well during cold rolling hot dip galvanizing, ornamental has saved zinc consumption improving simultaneously, has had preferable application and popularization value.
Claims (1)
1. a cold rolling hot dip galvanizing hot-strip production technology, it is characterised in that carry out according to the following step:
A. converter operation:
Blowing: iron block 57～60Kg/t, slag 4～5Kg/t, molten iron 1000～1005Kg/t, opens and blows addition lime 18～22Kg/t, dolomite 12～14Kg/t, blows 5 minutes, adds lime 9～11Kg/t, dolomite 6～7Kg/t, blows 9～12 minutes, sintering deposit 2.6～3.1Kg/t；Terminal composition: C content 0.06%～0.09%, Mn content 0.1%～0.15%, S content 0.018%～0.022%, P content 0.01%～0.017%, Si content 0.01%～0.02%；
Tapping: tap 30 seconds, adds ferrosilicon 0.85～1.0Kg/t, ferromanganese 5.2～5.6Kg/t, ferro-silico aluminium 0.85～0.95Kg/t, Si-Al-Ba-Ca 0.35～0.40Kg/t, control composition is at C content 0.06%～0.09%, Mn content 0.35%～0.42%, S content 0.02%～0.025%, P content 0.018%～0.022%, Si content 0.1%～0.16%, Als content 0.004%-0.006%, Ni content 0.035%～0.042%, Cr content 0.027%～0.032%；
B. Argon: 6 minutes ladle argon-blown time, be simultaneously introduced silicon-calcium wire 0.45-0.65Kg/t；
C. continuous casting: tundish temperature 1540 DEG C-1560 DEG C, coverture 0.7-0.75Kg/t, covering slag 0.4～0.45Kg/t, pouring basket liquid level >=400mm, thickness of slag layer >=60mm, pulling rate 1.0～1.2m/min；
D. hot rolling: heating-up temperature 1200 DEG C～1250 DEG C, finish rolling start rolling temperature 1000 ± 20 DEG C, finishing temperature
900 DEG C～920 DEG C, coiling temperature 600 DEG C～640 DEG C.
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| CN113846261B (en) * | 2021-09-28 | 2022-12-09 | 唐山瑞丰钢铁（集团）有限公司 | Production method of cold-rolled steel strip for titanium microalloyed refrigerator side plate steel under non-refining process condition |
| CN116103565A (en) * | 2022-12-16 | 2023-05-12 | 武安市裕华钢铁有限公司 | Production method of low-cost S350GD hot rolled steel strip |
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| CN1508276A (en) * | 2002-12-13 | 2004-06-30 | 涟源钢铁集团有限公司 | Low-carbon silicon steel strip for cold rolling and producting process thereof |
| KR20060035274A (en) * | 2004-10-22 | 2006-04-26 | 주식회사 포스코 | Method for manufacturing molten steel for galvanized steel plate |
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