CN1168548C - Method for improving surface quality of continuous casting plate bland - Google Patents
Method for improving surface quality of continuous casting plate bland Download PDFInfo
- Publication number
- CN1168548C CN1168548C CNB98125067XA CN98125067A CN1168548C CN 1168548 C CN1168548 C CN 1168548C CN B98125067X A CNB98125067X A CN B98125067XA CN 98125067 A CN98125067 A CN 98125067A CN 1168548 C CN1168548 C CN 1168548C
- Authority
- CN
- China
- Prior art keywords
- slab
- scaling
- continuous casting
- metal dust
- surface quality
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000009749 continuous casting Methods 0.000 title claims abstract description 15
- 239000002893 slag Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910004709 CaSi Inorganic materials 0.000 claims description 2
- 235000019353 potassium silicate Nutrition 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 239000000376 reactant Substances 0.000 abstract description 13
- 238000005266 casting Methods 0.000 abstract 2
- 238000005096 rolling process Methods 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Landscapes
- Metal Rolling (AREA)
Abstract
The present invention relates to a method for improving the surface quality of a continuous casting plate blank (2), particularly to a thin plate bank (2) with the maximal thickness of 100mm, wherein a casting slag film and a layer of oxide scale are covered on the plate bank (2); the plate bank (2) is descaled after casting, and the plate bank is rolled in a finishing mill line (9). Reactant (6) which is different from water is coated on the plate bank (2) before scale is removed or when the scale is removed according to the present invention.
Description
Technical field
The present invention relates to a kind of method of improving the method for surface quality of continuous casting plate bland and particularly relating to a kind of surface quality of the continuous-casting sheet billet that to improve maximum cast thickness be 100mm, wherein steel slab surface is coated with one deck slag film and one deck oxide skin, and slab is being accepted the de-scaling processing and is being subjected to rolling in a finishing mill line after the cast.
Background technology
Behind rolling intact sheet billet in finishing mill line, a lot of streaks promptly so-called " hot rolling striped " on the surface of hot-rolled band, have been stayed.In many hot-strips application scenario from now on, these stripeds can be tolerated.But under the situation strict especially to quality requirement, striped is not allow.Therefore, what adopt all the time in the application scenario of being strict with surface quality is the heavy slab that cast thickness is at least 150mm, but this is a comparison costliness and bothersome.
Summary of the invention
Task of the present invention is to provide a kind of method of improving surface quality of continuous casting plate bland, and streak wherein no longer occurs or at least obviously reduced striped quantity, thereby for the application scenario of being strict with quality, also can be with sheet billet as raw material.
Task of the present invention is so finished, and the reactant that promptly will be different from water before the de-scaling or in de-scaling the time is applied on the slab.Smearing reactant can carry out before common hydraulic pressure, machinery or vapour-pressure type are removed attached to the oxide skin on the slab.
More specifically, the invention provides a kind of method of improving the surface quality of continuous casting steel billet, wherein steel slab surface is coated with one deck slag film and one deck oxide skin, described method comprises that slab handles and be subjected to rollingly accepting de-scaling after the cast in a finishing mill line, also be included in before the de-scaling or when de-scaling metal dust be applied on the slab.
Description of drawings
Other details of the present invention and advantage are by having provided in the following description to embodiment.
In addition, be connected to the sheet blank continuous casting equipment of finishing mill line after unique accompanying drawing has drawn.
The specific embodiment
According to this accompanying drawing, watering in sheet blank continuous casting equipment 1 and having outpoured cast thickness is the slab 2 of d.The cast thickness d is 20mm-100mm, is 50mm as cast thickness.
After cast, make strand 2 bend into horizontal line section portion from vertical line segment portion by strand guiding roller 3.Subsequently, for example roll 35mm in advance by pre-roll 4 slab 2 that 50mm is thick.Describedly roll operation in advance preferably before slab 2 solidifies fully or be right after after described slab solidifies and carry out.
For the molten metal to be cast in sheet blank continuous casting equipment 1 is not adhered in the crystallizer, in sheet blank continuous casting equipment, adopted the crystallizer lubricant, it as slag blanket between crystallizer wall and base shell.When high temperature is poured into a mould, cast slag and treat that cast panel base 2 surfaces stick together and on slab 2 surfaces, formed one deck slag film thus.In addition, slab 2 remains red heat when it leaves sheet blank continuous casting equipment 1, so that has formed an oxide layer (oxide skin) at once when meeting with air oxygen subsequently on slab 2.Must as far as possible fully remove these two top layers before rolling is slag film and oxide skin.For this reason, nozzle 5 sprays to reactant 6 on the slab 2, and described reactant is emulsified state in waterglass.Subsequently, in car tunnel furnace 7, slab heated about 20 minutes to 30 minutes and in descaling device 8, it is carried out de-scaling subsequently at once.After the process de-scaling, slab (according to this embodiment, it is four frame finishing mills) in a multimachine frame finishing mill line 9 is accepted rolling and is batched subsequently on the coiling machine 10.Finishing mill line 9 certainly has the frame greater or less than four, is six machine frame rolling mills or two machine frame rolling mills as it.
Owing to adopted reactant 6, so the decomposability of oxide skin and slag film is obviously strong than without reactant 6 time.So, these two top layers are almost removed when de-scaling fully, thus rolling back streak never again almost on the finished product band.Slab 2 heating help the nearly surface region fusing of slab 2 here, and it also is the heat treatment to slab 2.Slab de-scaling in descaling device 8 operation by traditional approach as because, air pressure and/or mechanical system realize.
As reactant 6, can consider many kinds of materials.For example can adopt metal dust, it contains at least a metal in the following metal: Si, Al, CaSi or CaAl.Also can adopt nonmetal as carbon.In addition, oxide such as CaO, SiO
2, Al
2O
3, MgO, MnO, Na
2O, FeO, Fe
2O
3Or Fe
3O
4Also within limit of consideration.
Reactant 6 is present in the carrier with the concentration up to 90% (volume).Every square metre of pending strip surface needs about 1 to be raised to 2 liters undiluted reactant.
Also to say at last, not necessarily leave no choice but before the car tunnel furnace 7 reactant 6 is being applied on the slab 2.For example, also can just in car tunnel furnace 7 or when de-scaling is operated, reactant 6 be applied on the slab 2.
The Reference numeral list
1-sheet blank continuous casting equipment; 2-slab; 3-deflector roll; 4-pre-roll; 5-nozzle; 6-reactant; 7-car tunnel furnace; 8-descaling device; 9-finishing mill line; 10-coiling machine; D-cast thickness.
Claims (10)
1. method of improving the surface quality of continuous casting steel billet, wherein steel slab surface is coated with one deck slag film and one deck oxide skin, described method comprises that slab handles and be subjected to rollingly accepting de-scaling after the cast in a finishing mill line, also be included in before the de-scaling or when de-scaling metal dust be applied on the slab.
2. the method for claim 1 is characterized in that, described metal is Si, Al, CaSi or CaAl.
3. the method for claim 1 is characterized in that, described continuous casting steel billet is that maximum cast thickness is the sheet billet of 100mm.
4. the method for claim 1 also is included in and smears after the metal dust, and slab is heat-treated.
5. method as claimed in claim 4 is characterized in that, described heat treatment comprises heats slab momently so that the nearly surface region fusing of slab.
6. the method for claim 1 is included in and smears before metal dust and the de-scaling, rolls described slab in advance.
7. method as claimed in claim 6, be included in slab solidify fully before or be right after and after it solidifies fully, roll described slab in advance.
8. the method for claim 1 comprises that described de-scaling operation is to realize by at least a mode in hydraulic pressure, air pressure and the machinery.
9. the method for claim 1 is characterized in that, described metal dust mixes with a kind of carrier mass.
10. method as claimed in claim 9 is characterized in that, described carrier mass is water or waterglass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB98125067XA CN1168548C (en) | 1998-11-16 | 1998-11-16 | Method for improving surface quality of continuous casting plate bland |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB98125067XA CN1168548C (en) | 1998-11-16 | 1998-11-16 | Method for improving surface quality of continuous casting plate bland |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1246392A CN1246392A (en) | 2000-03-08 |
| CN1168548C true CN1168548C (en) | 2004-09-29 |
Family
ID=5229004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB98125067XA Expired - Fee Related CN1168548C (en) | 1998-11-16 | 1998-11-16 | Method for improving surface quality of continuous casting plate bland |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1168548C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR112012022221A2 (en) * | 2010-03-11 | 2016-07-05 | Sumito Metal Ind Ltd | manufacturing process and apparatus for manufacturing hot rolled steel sheet |
-
1998
- 1998-11-16 CN CNB98125067XA patent/CN1168548C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1246392A (en) | 2000-03-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040929 Termination date: 20101116 |