CN107309271B - A method of inhibiting hot rolled H-shaped surface red rust - Google Patents
A method of inhibiting hot rolled H-shaped surface red rust Download PDFInfo
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- CN107309271B CN107309271B CN201710641949.3A CN201710641949A CN107309271B CN 107309271 B CN107309271 B CN 107309271B CN 201710641949 A CN201710641949 A CN 201710641949A CN 107309271 B CN107309271 B CN 107309271B
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- profile steel
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- cooling water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/088—H- or I-sections
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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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The present invention relates to a kind of methods for inhibiting hot rolled H-shaped surface red rust, which is characterized in that includes the following steps：(1) when H profile steel enters mill milling, in 900 DEG C~1150 DEG C rolling temperature ranges, roll cooling water is avoided to form residual in the H profile steel web and the slot that surrounds of top flange after rolling；(2) after finish to gauge, on runout table and cold bed, use is air-cooled, is cooled to 100 DEG C or less；(3) it when going out after cold bed sawing H profile steel end to end, prevents from forming residual in the slot that sawing cooling water enters H profile steel web and top flange surrounds.During this method limits H profile steel hot stage and room temperature storage, the reciprocation on surface and water, it is suppressed that FeOOH and Fe russet2O3Generation, reduce surface red rust tendency, be conducive to improve surface quality and appearance.
Description
Technical field
The invention belongs to technical field of steel rolling, and in particular to a method of inhibit hot rolled H-shaped surface red rust.
Background technique
H profile steel is a kind of economical section steel, and compared with common I-steel, since its shape is uniform, mechanical property is excellent
Different, when rolling, has uniform deformation and lesser internal stress, thus have modulus of section it is big, it is light-weight, save metal, convenient for spelling
The advantages that dress, therefore be widely used in the structures such as industry, building, bridge, ocean platform.
Traditional H profile steel production generally goes through heating-de-scaling-BD1 (blooming mill break down)-BD2-is omnipotent and rolls
Machine-cold bed-finishing procedure, entire course of hot rolling is at 900 DEG C or more, and compared with the production of conventional hot rolled plate band, H profile steel is raw
Producing line is only in furnace outlet setting de-scaling, the operation of rolling without de-scaling, therefore the secondary oxidation iron sheet generated during rolling can not
Removal, deforms together with rolled piece, is easy indentation matrix and combines closely therewith, also without scale on surface treatment process after rolling.
Domestic Duo Jia H profile steel manufacturing enterprise is all similar technique, but faces surface red rust problem in various degree, and related H profile steel table
The patent and report of flushing rust control technology are less.There are many reports for being directed to surface red rust control measure in plate & strip production field
Road improves de-scaling temperature if reduced the Si content in composition, increases de-scaling pressure and passage, prevents roll surface from falling off, but
For existing conventional H Section Steel Production, these measures perhaps conflict with technique or do not have appointed condition.In consideration of it,
The present invention is directed under existing H profile steel manufacturing condition, propose a kind of relatively inexpensive practical control measure, to weaken or eliminate
The surface red rust problem of H profile steel.
Summary of the invention
In view of this, on the basis of it is an object of the invention to not change existing H profile steel technique, by inhibiting the hot rolling phase
Between, the reciprocation of cooling water and H profile steel surface when roller repairing and sawing, and then H profile steel surface red rust is controlled, improve table
Face quality and appearance.
In order to achieve the above objectives, the present invention provides the following technical solutions：
A method of inhibiting hot rolled H-shaped surface red rust, includes the following steps：
(1) when H profile steel enters mill milling, in 900 DEG C~1150 DEG C rolling temperature ranges, roll cooling water is avoided to exist
Residual is formed in the slot that H profile steel web and top flange after rolling surround；(2) after finish to gauge, on runout table and cold bed, using sky
It is cold, it is cooled to 100 DEG C or less；(3) when going out after cold bed sawing H profile steel end to end, prevent sawing cooling water from entering H profile steel web and upper limb
Residual is formed in the slot that edge surrounds.
Further, roll cooling water is avoided to be formed when rolling in the H profile steel web and the slot that surrounds of top flange after rolling residual
Stay method as follows：Add water discharging board before and after roll, roll cooling water is exported along fore side and transmission side, entry deterrence H profile steel
Residual is formed in the slot that web and top flange surround.
Further, sawing H profile steel end to end when prevent shape in the slot that sawing cooling water enters H profile steel web and top flange surrounds
It is as follows at residual method：Sawing H profile steel end to end when, close to side end to end, install sealing gland additional and sawing cooling water prevented to enter H profile steel abdomen
Residual is formed in the slot that plate and top flange surround.
The beneficial effects of the present invention are：The invention proposes a kind of method for inhibiting hot rolled H-shaped surface red rust, limitations
During H profile steel hot stage and room temperature store, the reciprocation on surface and water, it is suppressed that FeOOH and Fe russet2O3's
It generates, reduces surface red rust tendency, be conducive to improve surface quality and appearance.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out
Explanation：
Fig. 1 shows the variations of rolled piece surface red scale value under different cooling operating conditions；
Fig. 2 indicates the time that rolled piece scale on surface pickling is clean under different cooling operating conditions.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
Certain domestic Large Steel plant process flow is：Thick de-scaling-BD1-BD2- universal mill-cold bed-the saw of walking beam furnace-
It cuts-is put in storage, production kind is mainly the structural steel of Q235~Q460 rank.Heating temperature is 1220 DEG C~1270 DEG C, BD1 entrance
1120 DEG C~1140 DEG C of temperature, 1050 DEG C~1070 DEG C of BD2 inlet temperature, 1120 DEG C~1140 DEG C of universal mill inlet temperature,
900 DEG C~920 DEG C of finishing temperature, 860 DEG C~880 DEG C of cold bed inlet temperature, 60 DEG C~80 DEG C of cold bed outlet temperature.
Since operation, there is serious surface red rust in product, influence presentation quality.The analysis of causes is as follows：(1) it is rolling
Only thick de-scaling is arranged in furnace outlet in line, and BD1 to cold bed process section without de-scaling, causes secondary oxidation during high temperature rolling
The generation and indentation of iron sheet；(2) during rolling, shape in the slot that roll cooling water largely enters H profile steel web and top flange surrounds
At residual, and the residual action time, in 20s or more, remaining cooling water may exacerbate the oxidation on high temperature H profile steel surface；(3)
When sawing, no baffle device for water, the interior formation residual of slot that cooling water largely enters H profile steel web and top flange surrounds, and be genetic to
Warehouse for finished product laydown area exacerbates the further corrosion during storage；(4) other reasons, composition, rolling pattern and cooling technique etc.
It is unreasonable, lead to red rust defect.
For above-mentioned reason, further analyze, it is qualified with the properties of product of current process production, therefore technological parameter is unsuitable
Change；Increase de-scaling during rolling to eliminate secondary scale on surface, need to add water system and spray header again, and due to
H profile steel rolling deformation extends, and the iron sheet after high pressure descaling is accumulated in slot in H profile steel, easily causes lower process rolling indentation defect,
It assesses, is also not suitable for from cost and indentation risk.Therefore the method for relatively simple economy is exactly to during rolling and sawing
Cooling water is covered.It is normal temperature state when sawing and reservoir area is stored, steel are influenced easy life by steam for a long time in normal temperature state
Rust belongs to common sense, and whether masking is inevitable effective, and effective when high temperature, and the residual water of cooling during need to determining high temperature has promotion red rust
Without effect.
For this purpose, having carried out rolled piece hot stage surface, whether there is or not the comparisons that the residual water of cooling influences red rust.H profile steel has been selected to exist
Two during Rolling With Universal Mill typical rolling temperatures are studied, and Fig. 1 lists rolled piece surface red scale value a* under different operating conditions
Variation, show that rolled piece surface red is more obvious more greatly using the a* of spectrophotometer measurement.As a result find out, in same rolling work
Under condition, compared with air-cooled, the cooling for having water to participate in after rolling has aggravated the redness of specimen surface, under high temperature, rolled piece surface oxidation
Iron sheet and residual water, air interact, and promote the generation reacted as follows：
3FeO+H2O=Fe3O4+H2
2FeO+H2O=Fe2O3+H2
Fe2++2OH-=Fe (OH)2
4Fe(OH)2+O2=4 alpha-feooh+2H2O
2 alpha-feoohs=α-Fe2O3+H2O
3α-Fe2O3+H2=2Fe3O4+H2O
4Fe3O4+O2=6 γ-Fe2O3
Promote the high oxide FeOOH (FeOOH) and bloodstone (Fe of Fe2O3) generation, the two is in room
It is presented under temperature red.
Fig. 2 is the room temperature rolled piece surface acid-washing clean required time, the results showed that water cooling is to 750 DEG C under the same operating condition of Fig. 1
Air-cooled pickling time longest afterwards sorts according to the pickling complexity of the oxide of iron, Fe2O3>Fe3O4>Thus FeO can sentence
Break and, the residual water of high temperature causes containing more difficult pickling compositions in scale on surface, in conjunction with red scale value as a result, further prove
The residual water of high temperature is to Fe in scale on surface component2O3Facilitation.
As a result, under the premise of not changing technique, the red rust control measure in the H profile steel production of simple economy are proposed：
(1) in 900 DEG C~1150 DEG C rolling temperature ranges, should be avoided H profile steel web of the roll cooling water after rolling and
Residual is formed in the slot that top flange surrounds；Water discharging board can be added in roll front and rear sides, by roll cooling water along fore side and transmission
Residual is formed in the slot that side export, entry deterrence H profile steel web and top flange surround.
(2) after universal mill finish to gauge, under the premise of not influencing performance, on runout table and cold bed, using air-cooled side
Formula is cooled to 100 DEG C hereinafter, rolled piece after finish to gauge is avoided to contact in hot stage with water, aggravates red rust degree.
(3) sawing H profile steel end to end when, shape in the slot that sawing cooling water enters H profile steel web and top flange surrounds should be prevented
At residual.It installs sealing gland additional in the side end to end close to H profile steel using live compressed air source and sawing cooling water is prevented to enter H-type
Residual is formed in the slot that steel web and top flange surround.
By the above measure, gained steel rolling surface also demonstrates the above method without reddening, from result and limits H profile steel high temperature
During stage and room temperature store, the reciprocation on surface and water, it is suppressed that FeOOH and Fe russet2O3Generation, reduce
Red rust tendency in surface is conducive to improve surface quality and appearance.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (3)
1. a kind of method for inhibiting hot rolled H-shaped surface red rust, which is characterized in that include the following steps：
（1）When H profile steel enters mill milling, in 900 DEG C ~ 1150 DEG C rolling temperature ranges, avoid roll cooling water after rolling
H profile steel web and the slot that surrounds of top flange in form residual；（2）After finish to gauge, on runout table and cold bed, use is air-cooled,
It is cooled to 100 DEG C or less；（3）Out after cold bed sawing H profile steel end to end when, prevent sawing cooling water from entering H profile steel web and top flange
Residual is formed in the slot surrounded.
2. a kind of method for inhibiting hot rolled H-shaped surface red rust according to claim 1, which is characterized in that avoided when rolling
It is as follows that roll cooling water forms residual method in the H profile steel web and the slot that surrounds of top flange after rolling：Before and after roll plus cut
Water plate forms roll cooling water along the slot that fore side and transmission side export, entry deterrence H profile steel web and top flange surround
Residual.
3. a kind of method for inhibiting hot rolled H-shaped surface red rust according to claim 1, which is characterized in that sawing H profile steel head
Prevent formation residual method in the slot that sawing cooling water enters H profile steel web and top flange surrounds as follows when tail：Sawing H profile steel head
When tail, close to side end to end, installs sealing gland additional and prevent formation in the slot that sawing cooling water enters H profile steel web and top flange surrounds residual
It stays.
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| CN201710641949.3A CN107309271B (en) | 2017-07-31 | 2017-07-31 | A method of inhibiting hot rolled H-shaped surface red rust |
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| CN201710641949.3A CN107309271B (en) | 2017-07-31 | 2017-07-31 | A method of inhibiting hot rolled H-shaped surface red rust |
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| CN107309271B true CN107309271B (en) | 2018-11-23 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0615340A (en) * | 1992-07-01 | 1994-01-25 | Nisshin Steel Co Ltd | Method for spraying lubricant for rolling |
| KR20120044185A (en) * | 2010-10-27 | 2012-05-07 | 현대제철 주식회사 | Apparatus for removing remained water from hot coil |
| CN102974609A (en) * | 2012-12-06 | 2013-03-20 | 莱芜钢铁集团有限公司 | H-shaped steel hot rolling production method |
| CN103667878A (en) * | 2012-08-31 | 2014-03-26 | 宝山钢铁股份有限公司 | Steel strip for thin-wall oil bucket and manufacturing method thereof |
| CN203621096U (en) * | 2013-11-08 | 2014-06-04 | 宝钢特钢有限公司 | Water retaining device for rolling mill |
| CN106311745A (en) * | 2016-08-29 | 2017-01-11 | 首钢京唐钢铁联合有限责任公司 | Hot rolling method for reducing red rust on surface of hot-rolled strip steel |
-
2017
- 2017-07-31 CN CN201710641949.3A patent/CN107309271B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0615340A (en) * | 1992-07-01 | 1994-01-25 | Nisshin Steel Co Ltd | Method for spraying lubricant for rolling |
| KR20120044185A (en) * | 2010-10-27 | 2012-05-07 | 현대제철 주식회사 | Apparatus for removing remained water from hot coil |
| CN103667878A (en) * | 2012-08-31 | 2014-03-26 | 宝山钢铁股份有限公司 | Steel strip for thin-wall oil bucket and manufacturing method thereof |
| CN102974609A (en) * | 2012-12-06 | 2013-03-20 | 莱芜钢铁集团有限公司 | H-shaped steel hot rolling production method |
| CN203621096U (en) * | 2013-11-08 | 2014-06-04 | 宝钢特钢有限公司 | Water retaining device for rolling mill |
| CN106311745A (en) * | 2016-08-29 | 2017-01-11 | 首钢京唐钢铁联合有限责任公司 | Hot rolling method for reducing red rust on surface of hot-rolled strip steel |
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