CN1246392A - 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
- CN1246392A CN1246392A CN 98125067 CN98125067A CN1246392A CN 1246392 A CN1246392 A CN 1246392A CN 98125067 CN98125067 CN 98125067 CN 98125067 A CN98125067 A CN 98125067A CN 1246392 A CN1246392 A CN 1246392A
- Authority
- CN
- China
- Prior art keywords
- slab
- reactant
- scaling
- described method
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000009749 continuous casting Methods 0.000 title claims description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000376 reactant Substances 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910004709 CaSi Inorganic materials 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910052755 nonmetal 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
- 239000010959 steel Substances 0.000 claims description 2
- -1 CaO Chemical class 0.000 claims 1
- 229910044991 metal oxide Inorganic materials 0.000 claims 1
- 150000004706 metal oxides Chemical class 0.000 claims 1
- 238000002791 soaking Methods 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000428 dust Substances 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
- 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
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Abstract
A method for improving the surface quality of conticast slab, especially the thin slab not thicker than 100 mm features that the raw conticast slab, which has a layer of cast slags and a layer of oxidized film on its surface, is coated with reacting agent other than water, then the scales on its surface are removed, and finally, it is rolled by a fine rolling mill.
Description
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.
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.
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.
Other details of the present invention and advantage are by having provided in dependent claims and 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.
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.
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; The 2-slab; The 3-deflector roll; The pre-roll of 4-; The 5-nozzle; The 6-reactant; 7-is with tunnel-type; The 8-descaling device; The 9-finishing mill line; The 10-coiling machine; D-pours into a mould thickness
Claims (9)
1. method of improving the surface quality of continuous casting steel billet (2) and particularly improving maximum cast thickness the surface quality of the continuous-casting sheet billet (2) that is 100mm, wherein slab (2) surface coverage has one deck slag film and one deck oxide skin, slab (2) is being accepted the de-scaling processing and is being subjected to rolling in a finishing mill line (9) after the cast, it is characterized in that the reactant (6) that will be different from water before the de-scaling or in de-scaling the time is applied on the slab (2).
2. the method for claim 1 is characterized in that, carries out slab (2) heat treatment, as heating slab momently so that the fusing of the nearly surface region of slab (2).
3. method as claimed in claim 1 or 2 is characterized in that, before soaking into reactant (6) and de-scaling, rolls slab (2) in advance.
4. method as claimed in claim 3, its feature in, before slab (2) solidifies fully or be right after and after it solidifies fully, carry out the described operation of rolling in advance.
5. as the described method of one of claim 1-4, it is characterized in that described de-scaling operation realizes by hydraulic pressure, air pressure and/or mechanical system.
6. as the described method of one of claim 1-5, it is characterized in that reactant (6) contains at least a metal such as Si, Al, CaSi or CaAl.
7. as the described method of one of claim 1-6, it is characterized in that reactant (6) contains at least a nonmetal as carbon.
8. as the described method of one of claim 1-7, it is characterized in that reactant (6) contains at least a oxide and particularly metal oxide such as CaO, SiO
2, Al
2O
3, MgO, MnO, Na
2O, FeO, Fe
2O
3Or Fe
3O
4
9. as the described method of one of claim 1-8, it is characterized in that, in reactant (6), be mixed with a kind of carrier such as 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 true CN1246392A (en) | 2000-03-08 |
| CN1168548C 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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102781598A (en) * | 2010-03-11 | 2012-11-14 | 住友金属工业株式会社 | Hot-rolled steel sheet manufacturing method and manufacturing device |
-
1998
- 1998-11-16 CN CNB98125067XA patent/CN1168548C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102781598A (en) * | 2010-03-11 | 2012-11-14 | 住友金属工业株式会社 | Hot-rolled steel sheet manufacturing method and manufacturing device |
| US8945319B2 (en) | 2010-03-11 | 2015-02-03 | Nippon Steel & Sumitomo Metal Corporation | Manufacturing method and manufacturing apparatus of hot-rolled steel sheet |
| TWI474878B (en) * | 2010-03-11 | 2015-03-01 | Nippon Steel & Sumitomo Metal Corp | Manufacturing method and manufacturing apparatus of hot-rolled steel sheet |
| CN102781598B (en) * | 2010-03-11 | 2015-09-23 | 新日铁住金株式会社 | The manufacture method of hot rolled steel plate and manufacturing installation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1168548C (en) | 2004-09-29 |
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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 |