CN104588418B - A kind of method eliminating ultra-low-carbon steel surface pit defect - Google Patents
A kind of method eliminating ultra-low-carbon steel surface pit defect Download PDFInfo
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- CN104588418B CN104588418B CN201410709638.2A CN201410709638A CN104588418B CN 104588418 B CN104588418 B CN 104588418B CN 201410709638 A CN201410709638 A CN 201410709638A CN 104588418 B CN104588418 B CN 104588418B
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- carbon steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
Abstract
The invention belongs to technical field of steel rolling, disclose a kind of method eliminating ultra-low-carbon steel surface pit defect, comprise the following steps: control the tapping temperature of ultra-low-carbon steel slab, keep tapping temperature in the range of 1200 DEG C～1240 DEG C；Promote finish rolling and throw steel speed, control finish rolling and throw steel speed at 12m/s～15m/s；The cooling water open amount controlled between first three frame of precision rolling working roll is respectively 50%, 50% and 80%；Open finish rolling two, three passage roll gap water；Control the insertion depth of withdrawal straightening machine roller and smoothing roll, be positioned at high depth section.The present invention adjusts ultra-low-carbon steel technological operation in hot rolling and cold-rolling process section by combination, greatly reduces the generation of ferrum oxide cortex, thus eliminates pit defect.
Description
Technical field
The present invention relates to technical field of steel rolling, eliminate ultra-low-carbon steel surface pit defect particularly to one
Method.
Background technology
The feature of ultra-low-carbon steel is that Ultra-low carbon, microalloying and steel are pure, is formed after adding Ti and Nb
Carbon, nitrogen compound thus the interstitial atoms such as fixing C, N, be that current deep drawability is best, highest-ranking
Punching Steel, is widely used in the industry such as automobile making, household electrical appliances production, in particular for making outside automobile
Plate, inner panel.
In order to obtain the comprehensive mechanical property such as low yield strength, high-elongation, IF steel generally uses high temperature eventually
Roll, the hot rolling technology of high temperature coiling, obtain the precipitate particles such as thick TiC with this, thus optimize steel
Volume performance.But high-temperature final rolling, high temperature coiling can cause hot rolling surface to form thicker ferrum oxide cortex, special
It not four ferrum oxide cortexes after batching, cause being difficult to thoroughly clean in acid cleaning process, cold-rolled
In journey, residual oxidization iron sheet is grinded up and is pressed into belt steel surface, is reduced through even stepping back broken ferrum oxide
For sponge iron particle, macroscopically show as the canescence pit defect being ribbon and being distributed along rolling direction.
Pit defect is once formed, and cannot eliminate in subsequent handling, has a strong impact on the surface quality of IF steel finished product,
Especially constraining the application in automobile exterior panel field of the IF steel, some serious pit is potential formation of crack,
Easily being further development of cracking defect after large deformation punching press, producer and user to steel are all made
Heavy losses are become.
Summary of the invention
The technical problem to be solved is to provide and a kind of can not affect the existing of ultra-low-carbon steel
In the case of technique, the method efficiently eliminating pit defect.
For solving above-mentioned technical problem, the invention provides a kind of elimination ultra-low-carbon steel surface pit defect
Method, comprise the following steps:
Control the tapping temperature of ultra-low-carbon steel slab, keep tapping temperature 1200 DEG C～1240 DEG C of scopes
In；
Promote finish rolling and throw steel speed, control finish rolling and throw steel speed at 12m/s～15m/s；
Control the cooling water open amount between first three frame of precision rolling working roll be respectively 50%, 50% and
80%；
Open finish rolling two, three passage roll gap water；Control the insertion depth of withdrawal straightening machine roller and smoothing roll,
It is positioned at high depth section.
Further, according to the insertion of thickness and the width of ultra-low-carbon steel, withdrawal straightening machine roller and smoothing roll
Depth bounds:
When belt steel thickness specification is in 2.9-4.5mm, roller insertion should be at 27-40mm；Aligning
Roller insertion 4-12mm；Elongation percentage 1.3-1.8%；
Belt steel thickness specification is in 4.5-5.5mm, and when not including 4.5, roller insertion should be at
25-34mm；Smoothing roll insertion 3-9mm；Elongation percentage 1.2-1.7%；
During belt steel thickness specification ＞ 5.5mm, roller insertion should be at 25-32mm；Smoothing roll inserts
Amount 2-8mm；Elongation percentage 1.2-1.6%.
The method eliminating ultra-low-carbon steel surface pit defect that the present invention provides is by the way of low temperature is come out of the stove
The thickness reducing the raw oxide layer of stove reduces the difficulty of just de-scaling；Throw steel speed by promoting, effectively reduce
The generation of three iron scales in surface, finish rolling district；Band steel core is suitably adjusted by adjusting the flow of cooling water
Portion's temperature and surface temperature, it is ensured that while finishing temperature, also avoid high temperature strip steel to roll oxide-film
Damage, thus ensure strip surface quality；Promote scale breading effect by high depth straightening and avoid pit shape
Become.
Detailed description of the invention
The embodiment of the present invention provide a kind of method eliminating ultra-low-carbon steel surface pit defect, including with
Lower step:
Control the tapping temperature of ultra-low-carbon steel slab, keep tapping temperature 1200 DEG C～1240 DEG C of scopes
In；
Promote finish rolling and throw steel speed, control finish rolling and throw steel speed at 12m/s～15m/s；
Control the cooling water open amount between first three frame of precision rolling working roll be respectively 50%, 50% and
80%；
Open finish rolling two, three passage roll gap water；Control the insertion depth of withdrawal straightening machine roller and smoothing roll,
It is positioned at high depth section.
Slab surface in heating process can form the raw iron scale of one layer of iron scale, referred to as stove, adds
The raw ferrum oxide cortex of hot temperature more blast furnace is the thickest, and follow-up being more difficult to is removed, and easily presses in the operation of rolling
Enter belt steel surface and cause the surface defects such as pit.Tapping temperature is controlled in low-temperature zone, i.e.
1200 DEG C～1240 DEG C can effectively be reduced the raw iron scale thickness of stove, be allowed to easily be removed by water under high pressure.
Meanwhile, reduce tapping temperature and can also improve rolling rhythm, be conducive to improving finishing speeds, reduce essence
Roll the generation thickness of three iron sheets of zone steel.Preferable temperature, at 1220 DEG C, is ensureing band steel core portion temperature
In the case of, the thickness of the raw oxide layer of stove is relatively low, produces line speed-raising amplitude reasonable.
When low temperature is come out of the stove, carry out just de-scaling operation thus remove the raw oxide layer of stove；Now, finish rolling is passed through
District's high-speed rolling and at a high speed throwing steel, the thickness and the minimizing strip steel that reduce the iron sheet generation of finish rolling district are cold at floor
The time that is empty of Duan Yunhang, reduce the generation of iron scale, reduce the pickling difficulty in downstream.
Control finish rolling throwing steel speed, at 12m/s～15m/s, is allowed to be in the high regime of finishing mill.
When strip steel is by cooling section, open interstand cooling water, reduce the temperature of belt steel surface, from
And reduce its destruction to work roll surface oxide-film.Strip steel top layer and heart portion temperature exist certain
The temperature difference, between suitable frame water open ratio, both can ensure that top layer cooling with protection roll oxidation
Film, it can also be ensured that band steel core portion temperature will not be too low and cause finishing temperature to ensure.Finish rolling work
Make the foundation of roller surface film oxide, maintain and oxide-film quality, the surface quality all directly affected.
The interstand cooling water unlatching ratio controlling first three frame of finish rolling is 50%, 50% and 80%, with
Shi Kaiqi finish rolling two, three passage roll gap water, can effectively control precision rolling working roll surface oxidation film quality,
Thus obtain good strip surface quality.
Before pulling-straightening equipment is arranged in pickling, make its scale on surface layer by hot rolling being carried out curved rectifying
Split, crush, thus preferably ferrum oxide cortex is removed in acid cleaning process.The effect of straightening scale breading
Can fruit be directly connected to subsequent oxidation iron sheet and remove completely, and the major parameter affecting pulling-straightening equipment is two
Individual roller and the insertion depth of a smoothing roll.Control the insertion depth of withdrawal straightening machine roller and smoothing roll,
It is positioned at high depth section, it is possible to effectively de-scaling；According to the degree of depth that different specification selections is suitable:
When belt steel thickness specification is in 2.9-4.5mm, roller insertion should be at 27-40mm；Aligning
Roller insertion 4-12mm；Elongation percentage 1.3-1.8%；
Belt steel thickness specification is in 4.5-5.5mm, and when not including 4.5, roller insertion should be at
25-34mm；Smoothing roll insertion 3-9mm；Elongation percentage 1.2-1.7%；
During belt steel thickness specification ＞ 5.5mm, roller insertion should be at 25-32mm；Smoothing roll inserts
Amount 2-8mm；Elongation percentage 1.2-1.6%.
The method eliminating ultra-low-carbon steel surface pit defect that the present invention provides is by the way of low temperature is come out of the stove
The thickness reducing the raw oxide layer of stove reduces the difficulty of just de-scaling；Throw steel speed by promoting, effectively reduce
The generation of three iron scales in surface；Band steel core portion temperature is suitably adjusted by adjusting the flow of cooling water
And surface temperature, it is ensured that also avoid the damage to roll oxide-film while finishing temperature, thus ensure
Strip surface quality；Promoting scale breading effect by high depth straightening avoids the iron sheet in pickling to remain.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme
And unrestricted, although the present invention being described in detail with reference to example, the ordinary skill people of this area
Member should be appreciated that and can modify technical scheme or equivalent, without deviating from
The spirit and scope of technical solution of the present invention, it all should be contained in the middle of scope of the presently claimed invention.
Claims (2)
1. the method eliminating ultra-low-carbon steel surface pit defect, it is characterised in that include following step
Rapid:
Control the tapping temperature of ultra-low-carbon steel slab, keep tapping temperature 1200 DEG C～1240 DEG C of scopes
In；
Promote finish rolling and throw steel speed, control finish rolling and throw steel speed at 12m/s～15m/s；
Control the cooling water open amount between first three frame of precision rolling working roll be respectively 50%, 50% and
80%；
Open finish rolling two, three passage roll gap water；Control the insertion depth of withdrawal straightening machine roller and smoothing roll,
It is positioned at high depth section.
2. the method eliminating ultra-low-carbon steel surface pit defect as claimed in claim 1, its feature exists
In, according to the insertion depth scope of thickness and the width of ultra-low-carbon steel, withdrawal straightening machine roller and smoothing roll:
When belt steel thickness specification is in 2.9-4.5mm, roller insertion should be at 27-40mm；Aligning
Roller insertion 4-12mm；Elongation percentage 1.3-1.8%；
Belt steel thickness specification is in 4.5-5.5mm, and when not including 4.5, roller insertion should be at
25-34mm；Smoothing roll insertion 3-9mm；Elongation percentage 1.2-1.7%；
During belt steel thickness specification ＞ 5.5mm, roller insertion should be at 25-32mm；Smoothing roll inserts
Amount 2-8mm；Elongation percentage 1.2-1.6%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410709638.2A CN104588418B (en) | 2014-11-28 | 2014-11-28 | A kind of method eliminating ultra-low-carbon steel surface pit defect |
Applications Claiming Priority (1)
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| CN201410709638.2A CN104588418B (en) | 2014-11-28 | 2014-11-28 | A kind of method eliminating ultra-low-carbon steel surface pit defect |
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| CN104588418A CN104588418A (en) | 2015-05-06 |
| CN104588418B true CN104588418B (en) | 2016-09-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106825080A (en) * | 2017-01-11 | 2017-06-13 | 首钢京唐钢铁联合有限责任公司 | A kind of method for removing Automobile Plate steel red rust defect |
| CN107052060B (en) * | 2017-04-07 | 2019-08-23 | 首钢集团有限公司 | A method of eliminating acid-cleaning plate Pinhole-shaped point defect |
| CN107626739B (en) * | 2017-10-16 | 2019-03-29 | 首钢集团有限公司 | A kind of process for realizing hot-strip finishing using pulling-straightening equipment |
| CN109226258B (en) * | 2018-09-05 | 2020-10-09 | 湖南华菱涟源钢铁有限公司 | Method for preventing medium-high carbon hot-rolled strip steel from generating roll marks |
| CN112647034A (en) * | 2020-11-20 | 2021-04-13 | 邯郸钢铁集团有限责任公司 | Industrial production method of high-salt-spray-corrosion-resistance galvanized IF steel |
Family Cites Families (5)
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| DE3517090A1 (en) * | 1985-05-11 | 1986-11-13 | SMS Schloemann-Siemag AG, 4000 Düsseldorf | METHOD FOR ROLLING FROM ROOF TO WARM BROADBAND |
| 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 |
| CN102896161B (en) * | 2012-10-22 | 2016-01-13 | 北京首钢股份有限公司 | A kind of minimizing technology of boracic cold-rolled steel hot rolling iron scale |
| CN104014593A (en) * | 2014-05-30 | 2014-09-03 | 济钢集团有限公司 | Method for controlling surface piebald defect of structural low alloy steel medium and thick plates |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Co-patentee after: Beijing Shougang Co., Ltd. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Co-patentee before: Beijing Shougang Co., Ltd. Patentee before: Capital Iron & Steel General Company |
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