CN102965486A - Technology for solving incomplete cleaning of acid washing on cold-rolled base material surface by virtue of steel rolling process - Google Patents
Technology for solving incomplete cleaning of acid washing on cold-rolled base material surface by virtue of steel rolling process Download PDFInfo
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- CN102965486A CN102965486A CN2012105048864A CN201210504886A CN102965486A CN 102965486 A CN102965486 A CN 102965486A CN 2012105048864 A CN2012105048864 A CN 2012105048864A CN 201210504886 A CN201210504886 A CN 201210504886A CN 102965486 A CN102965486 A CN 102965486A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 238000005096 rolling process Methods 0.000 title claims abstract description 14
- 239000002253 acid Substances 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 title claims abstract description 5
- 238000005406 washing Methods 0.000 title claims abstract description 5
- 238000005516 engineering process Methods 0.000 title abstract description 9
- 238000004140 cleaning Methods 0.000 title abstract 2
- 238000010438 heat treatment Methods 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000005097 cold rolling Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 11
- 229910052718 tin Inorganic materials 0.000 claims abstract description 8
- 238000005554 pickling Methods 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 239000003546 flue gas Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 229910000794 TRIP steel Inorganic materials 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 63
- 229910052742 iron Inorganic materials 0.000 abstract description 31
- 239000000470 constituent Substances 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 21
- 230000003647 oxidation Effects 0.000 description 13
- 238000007254 oxidation reaction Methods 0.000 description 13
- 229910052802 copper Inorganic materials 0.000 description 8
- 238000009628 steelmaking Methods 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 238000005204 segregation Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000003113 dilution method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Abstract
The invention discloses a technology for solving incomplete cleaning of acid washing on a cold-rolled base material surface by virtue of a steel rolling process, and belongs to the technical field of steel rolling. By virtue of the control on temperature of a steel billet in a furnace, the control on the heating speed, the control on the temperature of the heating furnace and the control on the in-furnace time, the thickness and constituents of a mill scale are changed, residual elements are attached in the mill scale under technical control, before rough rolling and finish rolling, scale removal passes of scale removal water are increased and the pressure of the scale removal water is also increased, so that the mill scale and the surface residual elements are separated from a steel billet base body. The technology has the advantages of meeting the method required by following surface cold rolling, improving the product yield of enterprises, using a lot of cheap iron ore containing a certain amount of residual elements, and lowering the cost before iron making. The contents of residual elements are as follows: Cu is not more than 0.030%, As is not more than 0.0150%, and Sn is not more than 0.010%.
Description
Technical field
The invention belongs to technical field of steel rolling, particularly a kind of technique that does not wash clean by rolling process solution cold rolling base surface acid.
Background technology
In the steel residual element such as Cu, As, Sn since its oxidation potential less than iron, in steelmaking process, be difficult to remove and enter fully molten steel, therefore can be by the solidifying segregation in the solidification of molten steel process in steel manufacture process, in the segregation of crystal boundary and separating out three kinds of different mechanism of action of enrichment between steel matrix and the zone of oxidation quality and the performance of steel are brought more impact and harm.
The countermeasures and method of residual element mainly contains at present control and the reduction steel: solid-state steel scrap preconditioning technique, iron-bearing mineral calcination process technique, batching dilution method, molten iron remove technology, molten steel removes technology and adds other inhibition element.But the impact that glided by the steel industry situation, mixing most domestic enterprise ore source points at present more, be easy to cause the residual element such as Cu, As increase in the molten iron, the higher surface quality to hot-rolled sheet coil of residual element in the steel has produced and has seriously influenced, and a large amount of acid occurred and do not wash clean phenomenon in cold-rolled process.This phenomenon is apparent to be the blackstreak that a lot of residual element enrichments appear in the cold rolled pickling steel sheets surface.
" residual element are on the impact of the hot cold rolling coil quality of ripples steel CSP " guarantees that from the residual element content that has only proposed in the documents such as the 1st phase in 2009 " world steel " by in control iron ore or the steel scrap residual element content in the steel billet is lower than certain level, but after the residual element content in the steel billet is too high, the method that remedies does not but have clear and definite relevant report, does not more have relevant patent to declare.
Summary of the invention
The object of the present invention is to provide a kind of technique that does not wash clean by rolling process solution cold rolling base surface acid, equipment condition in conjunction with each enterprise steel rolling scene, different according to the formation mechanism of different times iron scale and removing method, carry out necessary technology controlling and process by the link that respectively affects iron scale formation in steel rolling, reach the effect that alleviates the enrichment of Surfaces of Hot Rolled Strip residual element, thereby solved not clear problem of cold rolling base surface acid-washing.
The smelting furnace material principal constituent scope of application of the present invention is cold rolling base, and the main trade mark is that Q195, Q195L, SPHC, 08Al, IF steel, TRIP steel etc. are fit to cold rolling steel grade, residual element content (Cu≤0.030%, As≤0.0150%, Sn≤0.010%).The technical parameter of processing step and control is as follows:
(1) charging temperature: guarantee that the steel billet temperature of stove is at 800～950 ℃;
(2) time inside furnace: the time inside furnace of the first heating zone 30～60 minutes, the time inside furnace of the second heating zone 25～50 minutes, the time inside furnace of the 3rd heating zone 25～50 minutes, soaking zone 20～40 minutes, guarantee steel billet stove total amount heat-up time 120～180 minutes;
(3) furnace atmosphere: guarantee that the long-pending percentage composition of oxysome of flue gas of heating furnace is between 0～2%;
(4) Heating temperature: the temperature of the first heating zone is controlled at 1030～1050 ℃, and the temperature of the second heating zone is controlled at 1150～1170 ℃, and the temperature of the 3rd heating zone is controlled at 1310～1330 ℃, and the temperature of soaking zone is controlled at 1300～1320 ℃;
(5) de-scaling water: the hydraulic pressure of de-scaling water is at 16～20MPa, and the de-scaling passage is 5～7 times;
(6) acid washing conditions: pickling tank temperature: 60～80 ℃, pickling time: 40～60s, acid strength (mass percent): 12%～18%.Require inner rating result to be qualified (altogether being divided into 5 grades) at 1 grade or 2 grades after the pickling.
The main work of the present invention is the control of heating process, by the temperature that enters the stove steel billet is controlled, the control of rate of heating, the control of furnace temp and the control of time inside furnace, the thickness that changes iron scale with and component consist of, by technology controlling and process residual element are attached in the iron scale, before roughing and finish rolling, by increasing the de-scaling passage of de-scaling water, increase the pressure of de-scaling water, make iron scale and surperficial residual element break away from the steel billet matrix, solved the cold rolling base surface acid and do not washed clean.The concrete technology schema, as shown in Figure 1.
Residual element are divided three classes by the large I of its oxidation potential in steel, and its oxidation potentials of element bag such as Cu, As, Sn are lower than iron, and namely the oxidizing reaction when steel-making will not relate to these elements, so these residual element will all accumulate in the final steel products.Its oxidation potential of element such as C, H, N, S, P and iron approach, in the converting process of steel-making, wherein a part is removed oxidized, and remainingly in molten steel depends in part on them at the composition of molten steel and slag, and both have determined the partition ratio of residual element in molten steel and slag.The 3rd dvielement comprises Pb, Zn, V, Ti, Si, Al, Zr, Mg, Ca and Nb, and its oxidation potential will be higher than iron, and in the molten steel converting process, they are at first oxidized to enter slag and remove in mutually, generally can not enter molten steel.At present in the residual element problem in the relevant steel, the avidity that residual element mainly refer to Cu, As, Sn etc. and oxygen less than the avidity of iron and oxygen be oxidation potential less than iron, in steelmaking process, be difficult to remove and enter the element of molten steel fully.Because residual element can not effectively be removed when steel-making, therefore when recycling repeatedly, steel can run up to high level, and when these residual element contents reach certain content, may produce on some performance of steel obviously impact, and some other element is not all in the discussion scope of residual element.
The oxidation potential that the principle of the invention is based on residual element is lower than iron, the fusing point of the elements such as Cu, As, Sn is low simultaneously, by the control of rational temperature process, make its in steel manufacture process, avoid in the solidification of molten steel process solidifying segregation, in the segregation of crystal boundary and the generation of between steel matrix and zone of oxidation, separating out the phenomenon such as enrichment.
Cu, As, the fusing point of the elements such as Sn and the eutectic structure that forms between them is between 600 to 800 ℃, therefore to strictly control the charging temperature of process furnace, guarantee that the charging temperature of continuously cast bloom is at 800 ~ 950 ℃, thereby avoid continuously cast bloom at high temperature cooling, in the post bake process, because Cu, As, the oxidation potential energy of the elements such as Sn is lower than iron, oxidizing gas and steel material react, the residual element segregation is at crystal boundary, simultaneously since the preferential oxidation speed of iron obviously greater than the speed of residual element to the matrix internal diffusion, residual element are separated out between iron oxide layer and steel matrix layer, in the gradually enrichment of continuously cast bloom surface, form the low melting point enrichment phase.
What of the enrichment of element amounts such as Cu, As, Sn have direct relation with the oxidated layer thickness of billet surface, and the enriching quantity of the thicker residual element of oxidated layer thickness is larger, the more difficult pickling in cold rolling base surface.Residual element in the billet surface enrichment, major part is because there is not oxidation, be diffused into the surface of strand and the enriched layer that forms by zone of oxidation, therefore can control atmosphere in the process furnace by detecting oxygen content in the flue gas of heating furnace, guarantee the oxygen level of flue gas of heating furnace between 0 ~ 2%, thereby guarantee that process furnace is always weak oxide atmosphere or reducing atmosphere heating.
For the enrichment that reduces residual element also will guarantee the time of steel billet in process furnace, therefore to accelerate heat-up rate, shorten heat-up time, thereby reduce residual element in the enrichment time of billet surface, in the syllogic walking beam furnace, guarantee that the time inside furnace of the first heating zone was less than 60 minutes, the time inside furnace of the second heating zone was less than 50 minutes, the time inside furnace of the 3rd heating zone was less than 50 minutes, soaking zone was less than 40 minutes, thereby guarantee steel billet in stove total amount heat-up time less than 180 minutes, reach the purpose that reduces iron scale thickness.
Because iron scale and residual element and the bonding force of steel billet iron-based body and the porousness of iron scale have much relations, in order to obtain good open texture, need the Heating temperature of the higher steel billet of residual element is pressed the upper limit control of process furnace ability, the temperature that guarantees the first heating zone is controlled at 1030 ~ 1050 ℃, the temperature of the second heating zone is controlled at 1150 ~ 1170 ℃, the temperature of the 3rd heating zone is controlled at 1310 ~ 1330 ℃, and the temperature of soaking zone is controlled at 1300 ~ 1320 ℃.Thereby guarantee the rational porousness of iron scale, guaranteeing can be with it except clean in the follow-up de-scaling process.
The descaling system of the steel billet of heat before by roughing unit and finishing train can be removed most iron scale and residual element in process furnace, it is clean for low-melting residual element are removed, must strengthen the water spray pressure of de-scaling water system, guarantee the hydraulic pressure of de-scaling water between 16 ~ 20MPa, the de-scaling passage is 5 ~ 7 times.Large pressure can also change by the local temperature that increases casting billet surface except improving the peeling off the effect of iron scale, is that the surface produces the larger effect of expanding with heat and contract with cold, thereby makes the residual element of billet surface enrichment break away from the steel billet matrix.
Compared with prior art, the invention has the beneficial effects as follows:
1, with the residual element content that adopts in the control iron ore, perhaps compare by the technique that reduces residual element content in molten iron and the steel-smelting alloy early stage in steel-making, the present invention has changed the traditional way that the undesirable cold rolling steel billet of steel-making residual element in early stage control can only change, propose to control to satisfy by steel rolling process the method for follow-up cold rolling surface requirements, improved the product lumber recovery of enterprise.
2, by this technique, can liberate the raw material control of ironmaking, be convenient to a large amount of low price iron ores that contain a certain amount of residual element that adopt, can obviously reduce the front cost of iron.
Description of drawings
Fig. 1 is the schema of this processing method.
Embodiment
Concrete example
Chemical ingredients to the SPHC steel billet is as shown in table 1
The chemical ingredients surplus of the concrete steel billet of table 1 is Fe
Comparative Examples 1:
1, charging temperature: 650 ℃;
2, time inside furnace: the time inside furnace of the first heating zone 68 minutes, the time inside furnace of the second heating zone 52 minutes, the time inside furnace of the 3rd heating zone 65 minutes, 39 minutes soaking zone time was 224 minutes in stove total amount heat-up time.
3, furnace atmosphere: the oxygen level of flue gas of heating furnace is 3.0%.
4, Heating temperature: 1027 ℃ of the temperature of the first heating zone, the temperature of the second heating zone are controlled at 1143 ℃, and the temperature of the 3rd heating zone is controlled at 1283 ℃, and the temperature of soaking zone is controlled at 1280 ℃.
5, de-scaling water: the hydraulic pressure of de-scaling water is 16MPa, and the de-scaling passage is 3 roads.
Embodiment 1:
1, charging temperature: 810 ℃.
2, time inside furnace: the time inside furnace of the first heating zone 42 minutes, the time inside furnace of the second heating zone 32 minutes, the time inside furnace of the 3rd heating zone 35 minutes, 29 minutes soaking zone time was 138 minutes in stove total amount heat-up time.
3, furnace atmosphere: the long-pending percentage composition of the oxysome of heating furnace flue is 1.2%.
4, Heating temperature: the temperature of the first heating zone is controlled at 1042 ℃, and the temperature of the second heating zone is controlled at 1165 ℃, and the temperature of the 3rd heating zone is controlled at 1328 ℃, and the temperature of soaking zone is controlled at 1318 ℃.
5, de-scaling water: the hydraulic pressure of de-scaling water is 18MPa, and the de-scaling passage is 7 roads.
Other process parameter controls are all identical, slab behind the employing 200mm, be rolled into the band behind the 3mm, band finds after the pickling of same cold-rolling pickling line, a large amount of black ribbon grains occurred on the belt steel surface that adopts Comparative Examples 1 to produce, and in the upper and lower surface of whole piece band steel distribution arranged all, linearly or the undaform of this blackstreak, the belt steel surface blackout shades simultaneously, directly affects the surface quality of follow-up cold-rolled process, and rating result is 4 grades.And the belt steel surface light that adopts embodiment 1 to produce, without any blackstreak or spot, rating result is 1 grade.
Explanation is that above embodiment is only unrestricted so that technical scheme of the present invention to be described at last.Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can carry out the modification in the parameter area or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (1)
1. one kind solves the technique that the cold rolling base surface acid does not wash clean by rolling process, it is characterized in that the technical parameter of processing step and control is as follows:
(1) charging temperature: guarantee that the steel billet temperature of stove is at 800～950 ℃;
(2) time inside furnace: the time inside furnace of the first heating zone 30～60 minutes, the time inside furnace of the second heating zone 25～50 minutes, the time inside furnace of the 3rd heating zone 25～50 minutes, soaking zone 20～40 minutes, guarantee steel billet stove total amount heat-up time 120～180 minutes;
(3) furnace atmosphere: guarantee that the long-pending percentage composition of oxysome of flue gas of heating furnace is between 0～2%;
(4) Heating temperature: the temperature of the first heating zone is controlled at 1030～1050 ℃, and the temperature of the second heating zone is controlled at 1150～1170 ℃, and the temperature of the 3rd heating zone is controlled at 1310～1330 ℃, and the temperature of soaking zone is controlled at 1300～1320 ℃;
(5) de-scaling water: the hydraulic pressure of de-scaling water is at 16～20MPa, and the de-scaling passage is 5～7 times;
(6) acid washing conditions: pickling tank temperature: 60～80 ℃, pickling time: 40～60s, acid strength: 12 quality %～18 quality %; Inner rating result is qualified at 1 grade or 2 grades after the pickling;
The smelting furnace material scope of application is cold rolling base, and the trade mark is Q195, Q195L, SPHC, 08Al, IF steel, TRIP steel, residual element content: Cu≤0.030%, As≤0.0150%, Sn≤0.010%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949480A (en) * | 2014-04-28 | 2014-07-30 | 沈阳大学 | Method for controlling oxide scales on surfaces of easily-pickled hot-rolled strip steel |
| CN104324958A (en) * | 2014-09-24 | 2015-02-04 | 首钢总公司 | Method for overcoming surface landscape painting defects after LCAK steel pickling |
| CN109940043A (en) * | 2019-04-09 | 2019-06-28 | 唐山市德龙钢铁有限公司 | A kind of preparation method of easy pickled hot strip |
| CN114101357A (en) * | 2021-12-01 | 2022-03-01 | 福建三钢闽光股份有限公司 | Heating and descaling method for controlling furnace-generated iron scale of steel for wire rod |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949480A (en) * | 2014-04-28 | 2014-07-30 | 沈阳大学 | Method for controlling oxide scales on surfaces of easily-pickled hot-rolled strip steel |
| CN104324958A (en) * | 2014-09-24 | 2015-02-04 | 首钢总公司 | Method for overcoming surface landscape painting defects after LCAK steel pickling |
| CN109940043A (en) * | 2019-04-09 | 2019-06-28 | 唐山市德龙钢铁有限公司 | A kind of preparation method of easy pickled hot strip |
| CN109940043B (en) * | 2019-04-09 | 2020-07-03 | 唐山市德龙钢铁有限公司 | Preparation method of hot rolled strip steel easy to pickle |
| CN114101357A (en) * | 2021-12-01 | 2022-03-01 | 福建三钢闽光股份有限公司 | Heating and descaling method for controlling furnace-generated iron scale of steel for wire rod |
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| CN102965486B (en) | 2014-05-21 |
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