CN103909104B - Method for controlling piebaldness on surface of steel plate - Google Patents
Method for controlling piebaldness on surface of steel plate Download PDFInfo
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- CN103909104B CN103909104B CN201410110279.9A CN201410110279A CN103909104B CN 103909104 B CN103909104 B CN 103909104B CN 201410110279 A CN201410110279 A CN 201410110279A CN 103909104 B CN103909104 B CN 103909104B
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Abstract
The invention discloses a method for controlling piebaldness on the surface of a steel plate. The method includes that Si content is lowered from about 0.30% originally to below 0.20% by optimizing a steel plate composition system; heating temperature is controlled, tapping temperature is lowered, highest furnace temperature of a heating section is lowered to 1250 DEG C, and the tapping temperature is lowered to 1150 DEG C; pressure of high-pressure descaling water is strictly controlled at level of 210+/-10 Bar to improve surface quality of the steel plate, lower loss of the steel plate and reduce quality objection.
Description
Technical field
The present invention relates to steel plate manufacturing technology field, more particularly to a kind of control method of surface of steel plate piebaldism.
Background technology
Increasingly severe with steel market situation, user proposes more strict requirements to the surface quality of steel plate, especially
It is the industries such as engineering machinery, shipbuilding.Steel can form fe in heating process3o4、fe2o3Deng many oxide, if controlled not
When these oxides can produce steel fish scale-shaped, araneose decorative pattern by surface of steel plate after rolling, and this decorative pattern is deposited after ball blast
In obvious aberration, surface irregularity after painting after spray painting, have a strong impact on surface of the work aesthetics, directly contribute workpiece and scrap.
How to be controlled further for surface of steel plate decorative pattern, reduced the appearance of surface of steel plate piebaldism, be that the present invention needs to solve
Problem.
Content of the invention
The purpose of the present invention is aiming at above-mentioned defect and provides a kind of control method of surface of steel plate piebaldism.Logical
Cross and steel plate component system is optimized, reduce si content, be reduced to less than 0.20% by original 0.30% about；Control heating temperature
Degree, reduces tapping temperature, and bringing-up section highest furnace temperature is down to 1250 DEG C, and temperature drop of coming out of the stove is to 1150 DEG C；High pressure descaling water pressure is strict
Control the level in 210 ± 10bar, to improve plate surface quality, reduce steel plate loss, reduce quality objection.
A kind of control method technical scheme of surface of steel plate piebaldism of the present invention is to comprise the following steps that: kr molten iron
Pretreatment → converter smelting → deoxidation alloying → cas refine → lf refine → rh process → ccm continuous casting → strand cutting → casting
Base inspection cleaning → heating of plate blank → De-scaling box high-pressure water descaling → Stand Mill rolling, frame high-pressure water descaling → aligning → cutting
→ mark → warehouse-in；High-pressure water descaling is to produce water under high pressure using high-pressure hydraulic pump, and water under high pressure sprays through descaling jet, is formed at a high speed
Water jet, and get to billet surface at a certain angle, remove the iron scale of material surface.
Wherein, in converter steelmaking process, reduce the addition of ferrosilicon, si content in steel plate composition is reduced to 0.20%
Below；
During heating of plate blank, control heating-up temperature, reduce tapping temperature, bringing-up section highest furnace temperature is 1200-1250
DEG C, tapping temperature is 1100-1150 DEG C.
Preferably, during heating of plate blank, control heating-up temperature, reduce tapping temperature, bringing-up section highest furnace temperature is stove
Warm 1200-1230 DEG C, tapping temperature is 1100-1130 DEG C.
During De-scaling box high-pressure water descaling, de-scaling water pressure is controlled the level in 210 ± 10bar.
Preferably, during De-scaling box high-pressure water descaling, de-scaling water pressure is controlled the level in 210 ± 5bar.
During De-scaling box high-pressure water descaling, De-scaling box upper header spray angle is 26 degree, single upper header 18mpa pressure
Power down-off 150.3 l/min, vertical jetting height 213.5mm, under 18mpa pressure, maximum hitting power 8.9kgf/cm, effectively covers
Lid width 101.4mm, lap 5.4mm.
Upper header injector spacing 95.5mm, nozzle quantity 45, upper header jet width 4303.4mm, flow velocity 3.55m/s,
18mpa pressure lower collector pipe flow 6763.5-11198.1l/min.
During De-scaling box high-pressure water descaling, De-scaling box lower collector pipe spray angle is 30 degree, single lower collector pipe 18mpa pressure
Power down-off 77.8 l/min, vertical jetting height 130mm, maximum hitting power 10kgf/cm under 18mpa pressure, effectively cover wide
Degree 81mm, lap 5mm.
Lower collector pipe injector spacing 76mm, nozzle quantity 57, upper header jet width 4337mm, flow velocity 2.33m/s,
18mpa pressure lower collector pipe flow 4434.6-11198.1l/min.
Additionally, periodically carrying out water under high pressure to hit test, confirming descaling jet angle and abrasion condition, and being changed in time
Adjustment.
The invention has the benefit that
1st, the higher steel plate of si content, forms fayalite 2feo sio, fayalite on feo with base steel body interface
It is closely linked with matrix, be difficult to be removed completely in de-scaling.By reducing si content, can effectively reduce heating process
The growing amount of middle fayalite, reduces de-scaling difficulty.
2nd, pass through to reduce heating-up temperature and tapping temperature, it is possible to reduce the growing amount of iron scale, reduce ferrum oxide skin depth
Degree, it is to avoid generate fe red in a large number2o3.
3rd, high-pressure water pressure is the impact topmost factor of scale removal effect, and pressure increase can significantly improve blow speed and beat
Hit power, stable for the high-pressure water pressure level in 210 ± 10bar is remarkably improved scale removal effect.
4th, descaling system nozzle angle and abrasion condition directly affect hitting power and scale removal effect, hit examination by water under high pressure
Test, can accurately determine nozzle operation state, the nozzle going wrong is changed in time with adjustment it is ensured that scale removal effect.
The present invention, by being optimized to steel plate component system, reduces si content, is reduced to by original 0.30% about
Less than 0.20%；Control heating-up temperature, reduce tapping temperature, bringing-up section highest furnace temperature is down to 1250 DEG C, and tapping temperature is down to 1150
℃；High pressure descaling water pressure is strict controlled in the level of 210 ± 10bar, to improve plate surface quality, reduces steel plate loss,
Reduce quality objection.
Brief description
Fig. 1 high-pressure water descaling state diagram；
Fig. 2 is the impact to surface of the work for the steel plate piebaldism；
Fig. 3 is plate surface quality situation after present invention enforcement.
Specific embodiment:
For a better understanding of the present invention, describe technical scheme in detail with instantiation below, but this
Invention is not limited thereto.
A kind of control method of surface of steel plate piebaldism of the present invention, comprises the following steps that: kr molten iron pretreatment → turn
Stove smelting → deoxidation alloying → cas refine → lf refine → rh process → ccm continuous casting → strand cutting → strand inspection cleaning
→ heating of plate blank → De-scaling box high-pressure water descaling → Stand Mill rolling, frame high-pressure water descaling → align → cut → identify → enter
Storehouse；
Wherein, in converter steelmaking process, reduce the addition of ferrosilicon, si content in steel plate composition is reduced to 0.20%
Below；
During heating of plate blank, control heating-up temperature, reduce tapping temperature, bringing-up section highest furnace temperature is 1200-1250
DEG C, tapping temperature is 1100-1150 DEG C.
During De-scaling box high-pressure water descaling, de-scaling water pressure is controlled the level in 210 ± 10bar.
High-pressure water descaling is to produce water under high pressure using high-pressure hydraulic pump, and water under high pressure sprays through descaling jet, forms high speed water-jet
Stream, and get to billet surface at a certain angle, remove the iron scale of material surface, concrete schematic diagram such as Figure of description figure l
Shown, device parameter is as shown in table 1:
Table 1
.
Embodiment 1
It is high that certain steel mill supplies Volvo sm490a-v series steel plate Surface Quality to require, and surface matter once repeatedly before
Amount problem, for the problems referred to above, produces satisfactory steel plate by the inventive method, specifically comprises the following steps that
Kr molten iron pretreatment → converter smelting → deoxidation alloying → cas refine → lf refine → rh process → ccm continuous casting
→ strand cutting → strand inspection cleaning → heating of plate blank → De-scaling box high-pressure water descaling → Stand Mill rolling, frame water under high pressure remove
Squama → aligning → cutting → mark → warehouse-in；Wherein, in converter steelmaking process, reduce the addition of ferrosilicon, si content controls
In 0.15%-0.20%；
During heating of plate blank, control heating-up temperature, reduce tapping temperature, bringing-up section highest furnace temperature is furnace temperature 1220-
1250 DEG C, tapping temperature is 1120-1150 DEG C.
During De-scaling box high-pressure water descaling, de-scaling water pressure is controlled the level in 210 ± 10bar.
During De-scaling box high-pressure water descaling, De-scaling box upper header spray angle is 26 degree, single upper header 18mpa pressure
Power down-off 150.3 l/min, vertical jetting height 213.5mm, under 18mpa pressure, maximum hitting power 8.9kgf/cm, effectively covers
Lid width 101.4mm, lap 5.4mm.
Upper header injector spacing 95.5mm, nozzle quantity 45, upper header jet width 4303.4mm, flow velocity 3.55m/s,
18mpa pressure lower collector pipe flow 6763.5-11198.1l/min.
During De-scaling box high-pressure water descaling, De-scaling box lower collector pipe spray angle is 30 degree, single lower collector pipe 18mpa pressure
Power down-off 77.8 l/min, vertical jetting height 130mm, maximum hitting power 10kgf/cm under 18mpa pressure, effectively cover wide
Degree 81mm, lap 5mm.
Lower collector pipe injector spacing 76mm, nozzle quantity 57, upper header jet width 4337mm, flow velocity 2.33m/s,
18mpa pressure lower collector pipe flow 4434.6-11198.1l/min.
Additionally, periodically carrying out water under high pressure to hit test, confirming descaling jet angle and abrasion condition, and being changed in time
Adjustment.
Result: steel plate scale removal effect is obviously improved, plate surface quality be improved significantly, piebaldism oven improvement is by before
4% is reduced to less than 0.2%, essentially eliminates piebaldism problem, preferably meets customer demand, and quality objection prevents completely, obtains
To the highly recognition of user, create larger economic benefit.
Embodiment 2
It is high that certain steel mill supplies the deck of boat Surface Quality of Hyundai heavy industry to require, and once repeatedly surface quality before and asks
Topic, for the problems referred to above, produces satisfactory steel plate by the inventive method, specifically comprises the following steps that
Kr molten iron pretreatment → converter smelting → deoxidation alloying → cas refine → lf refine → rh process → ccm continuous casting
→ strand cutting → strand inspection cleaning → heating of plate blank → De-scaling box high-pressure water descaling → Stand Mill rolling, frame water under high pressure remove
Squama → aligning → cutting → mark → warehouse-in；Wherein, in converter steelmaking process, reduce the addition of ferrosilicon, si content controls
In 0.12%-0.18%；
During heating of plate blank, control heating-up temperature, reduce tapping temperature, bringing-up section highest furnace temperature is furnace temperature 1200-
1230 DEG C, tapping temperature is 1100-1130 DEG C.
During De-scaling box high-pressure water descaling, de-scaling water pressure is controlled the level in 210-225bar.
During De-scaling box high-pressure water descaling, De-scaling box upper header spray angle is 26 degree, single upper header 18mpa pressure
Power down-off 150.3 l/min, vertical jetting height 213.5mm, under 18mpa pressure, maximum hitting power 8.9kgf/cm, effectively covers
Lid width 101.4mm, lap 5.4mm.
Upper header injector spacing 95.5mm, nozzle quantity 45, upper header jet width 4303.4mm, flow velocity 3.55m/s,
18mpa pressure lower collector pipe flow 6763.5-11198.1l/min.
During De-scaling box high-pressure water descaling, De-scaling box lower collector pipe spray angle is 30 degree, single lower collector pipe 18mpa pressure
Power down-off 77.8 l/min, vertical jetting height 130mm, maximum hitting power 10kgf/cm under 18mpa pressure, effectively cover wide
Degree 81mm, lap 5mm.
Lower collector pipe injector spacing 76mm, nozzle quantity 57, upper header jet width 4337mm, flow velocity 2.33m/s,
18mpa pressure lower collector pipe flow 4434.6-11198.1l/min.
Additionally, periodically carrying out water under high pressure to hit test, confirming descaling jet angle and abrasion condition, and being changed in time
Adjustment.
Result: plate surface quality be improved significantly, the piebaldism amount of changing the original sentence to is reduced to less than 20 tons by 430 tons before,
Essentially eliminate piebaldism problem, preferably meet customer demand, quality objection prevents completely, obtain the highly recognition of user,
Create larger economic benefit.
Claims (2)
1. a kind of control method of surface of steel plate piebaldism is it is characterised in that comprise the following steps that: kr molten iron pretreatment → turn
Stove smelting → deoxidation alloying → cas refine → lf refine → rh process → ccm continuous casting → strand cutting → strand inspection cleaning
→ heating of plate blank → De-scaling box high-pressure water descaling → Stand Mill rolling, frame high-pressure water descaling → align → cut → identify → enter
Storehouse；
Wherein, in converter steelmaking process, reduce ferrosilicon addition, by si content in steel plate composition be reduced to 0.20% with
Under；
During heating of plate blank, control heating-up temperature, reduce tapping temperature, bringing-up section highest furnace temperature is furnace temperature 1200-1230
DEG C, tapping temperature is 1100-1130 DEG C;
During De-scaling box high-pressure water descaling, de-scaling water pressure is controlled the level in 210 ± 10bar；
During De-scaling box high-pressure water descaling, De-scaling box upper header spray angle is 26 degree, under single upper header 18mpa pressure
Flow 150.3 l/min, vertical jetting height 213.5mm, maximum hitting power 8.9kgf/cm under 18mpa pressure, effectively cover wide
Degree 101.4mm, lap 5.4mm；Upper header injector spacing 95.5mm, nozzle quantity 45, upper header jet width
4303.4mm, flow velocity 3.55m/s, 18mpa pressure lower collector pipe flow 6763.5-11198.1l/min；
During De-scaling box high-pressure water descaling, De-scaling box lower collector pipe spray angle is 30 degree, under single lower collector pipe 18mpa pressure
Flow 77.8 l/min, vertical jetting height 130mm, maximum hitting power 10kgf/cm, effective cover width under 18mpa pressure
81mm, lap 5mm；Lower collector pipe injector spacing 76mm, nozzle quantity 57, upper header jet width 4337mm, flow velocity
2.33m/s, 18mpa pressure lower collector pipe flow 4434.6-11198.1l/min.
2. a kind of control method of surface of steel plate piebaldism according to claim 1 is it is characterised in that in De-scaling box water under high pressure
During de-scaling, de-scaling water pressure is controlled the level in 210 ± 5bar.
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| CN201410110279.9A CN103909104B (en) | 2014-03-24 | 2014-03-24 | Method for controlling piebaldness on surface of steel plate |
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| CN201410110279.9A CN103909104B (en) | 2014-03-24 | 2014-03-24 | Method for controlling piebaldness on surface of steel plate |
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| CN103909104B true CN103909104B (en) | 2017-01-25 |
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| CN110624962B (en) * | 2019-10-17 | 2020-11-17 | 山东钢铁集团日照有限公司 | Method for improving structure of descaling box header and enhancing impact force |
| CN112718889A (en) * | 2020-11-23 | 2021-04-30 | 邯郸钢铁集团有限责任公司 | Method for improving descaling effect of steel billet |
| CN112893467B (en) * | 2021-01-14 | 2022-08-16 | 山东钢铁集团日照有限公司 | Method for controlling edge folding of wide and thick steel plate |
| CN113198857A (en) * | 2021-04-14 | 2021-08-03 | 首钢集团有限公司 | Method for improving quality consistency of upper surface and lower surface of strip steel |
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| CN100443201C (en) * | 2007-01-25 | 2008-12-17 | 鞍钢股份有限公司 | Surface iron scale control method for middle sheet billet continuous casting and rolling steel plate |
| JP4935460B2 (en) * | 2007-03-29 | 2012-05-23 | Ｊｆｅスチール株式会社 | Manufacturing method and manufacturing equipment for hot rolled steel sheet |
| CN101700533A (en) * | 2009-11-27 | 2010-05-05 | 天津钢铁集团有限公司 | Method for increasing scale removal effect of medium and heavy plate |
| CN101704026B (en) * | 2009-12-03 | 2011-07-20 | 南京钢铁股份有限公司 | Method for controlling pitting on surface of medium steel plate |
| CN101947557B (en) * | 2010-08-27 | 2013-04-10 | 攀钢集团钢铁钒钛股份有限公司 | Preparation method for reducing scales generated on surfaces of hot-rolled steel plates |
| CN103480655B (en) * | 2013-09-30 | 2015-09-30 | 南京钢铁股份有限公司 | A kind of control method eliminating Hot Rolling of Ship Plate surface pit defect |
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Granted publication date: 20170125 Termination date: 20190324 |