CN109097700A - A kind of easy pickling mild steel steel plate of CSP process and its manufacturing method - Google Patents
A kind of easy pickling mild steel steel plate of CSP process and its manufacturing method Download PDFInfo
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- CN109097700A CN109097700A CN201811122283.1A CN201811122283A CN109097700A CN 109097700 A CN109097700 A CN 109097700A CN 201811122283 A CN201811122283 A CN 201811122283A CN 109097700 A CN109097700 A CN 109097700A
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- steel plate
- pickling
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- mild steel
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
Abstract
The invention discloses a kind of easy pickling mild steel steel plate of CSP process and its manufacturing methods.Its chemical component and weight percent are as follows: C:0.020~0.050%；Si :≤0.030%；Mn :≤0.30%；P :≤0.015%；S :≤0.010%；Al:0.020~0.060%；Remaining is Fe and is inevitably mingled with.Manufactured using following steps: molten iron pretreatment, Argon station, the refining of LF furnace, CSP continuous casting, heating, high-pressure water descaling, hot rolling, section cooling, batches this steel plate and passes through reasonably smelting, heating, hot rolling, cooling and coiling technique converter smelting.The iron scale thickness of mild steel steel plate can be significantly reduced according to method disclosed by the invention, improves FeO ratio in iron scale, reduces the acid solution dosage of subsequent pickling process, reduced pickling time, improved its production efficiency and lumber recovery.
Description
Technical field
The present invention relates to the technical field of producing of Steel Products of Thin Slab Casting, and in particular to a kind of CSP process is easily sour
Wash mild steel steel plate and its manufacturing method.
Background technique
Mild steel acts mainly as cold rolling base use as one of the important species in CSP product structure, it is subsequent need by
Pickling process removes scale on surface.The scale on surface of hot-strip is generally by outermost layer Fe2O3, middle layer Fe3O4With
Most inner side FeO is formed, wherein Fe2O3It is most fine and close, Fe3O4Take second place, FeO is most loose；FeO is easiest to by sour reduction decomposition, Fe3O4It is secondary
It, Fe2O3It is most difficult to by sour reduction decomposition.Iron scale thickness is thinner, FeO ratio is more in scale structure, is more conducive to acid
Wash the raising of efficiency and coil pickled surface quality.
With the rapid development of the industries such as automobile, household electrical appliances, downstream user is not only higher and higher to the performance requirement of steel, and
And the requirement to surface quality of steel is more and more harsher.Cold rolling base generally improves by control pickling process in steel enterprise of the country at present
The surface quality of material lacks systematic research, hot rolled coil different location to CSP process surface of low-carbon steel quality for a long time due to domestic
Iron scale thickness and structure it is often inconsistent, after the iron scale of different-thickness and structure will directly influence pickling
Product surface quality and pickling efficiency cause the surface quality of final acid-cleaning plate often to will appear " deficient pickling " or " overpickling " existing
As.When generation " deficient pickling ", the iron scale of surface of steel plate does not have that pickling is complete, necessarily will affect subsequent product quality；
When generation " overpickling ", although the iron scale pickling of steel is clean, acid solution consumption increases or pickling time extends, gesture
Big pollution must be caused to ecological environment, not only bad for energy conservation and environmental protection, increase production cost, and seriously hinder subsequent
The promotion of cold-rolled products quality scale.
The method for reducing hot rolling strip steel scale thickness at present, improving pickling efficiency, on the one hand, be concentrated mainly on tradition
Hot continuous rolling process；On the other hand, bar strip continuous casting and rolling flow path research is relatively fewer, and to dephosphorization water pressure, cooling equipment energy
Force request is higher, and newly added equipment is needed to invest.These methods are not suitable for, or will increase production cost, do not have yet not at present
Under the premise of increasing production cost, the method for reduction CSP process mild steel iron scale, raising pickling efficiency.
Summary of the invention
The purpose of the present invention is to provide a kind of easy pickling mild steel steel plate of CSP process and its manufacturing methods.This steel plate
By reasonably smelting, heating, hot rolling, cooling and coiling technique, the iron scale thickness of mild steel steel plate can be significantly reduced,
FeO ratio in iron scale is improved, the acid solution dosage of subsequent pickling process is reduced, pickling time is reduced, improves its production efficiency
And lumber recovery.This mild steel steel plate be mainly used for for pickling, continuous annealing, cover annealing process cold rolling base.
The technical scheme adopted by the invention is as follows:
A kind of easy pickling mild steel steel plate of CSP process, which is characterized in that its chemical component and weight percent are as follows: C:
0.020~0.050%；Si :≤0.030%；Mn :≤0.30%；P :≤0.015%；S :≤0.010%；Al:0.020~
0.060%；Remaining is Fe and is inevitably mingled with.
Further, chemical component and weight percent are preferred are as follows: C:0.024~0.048%；Si:0.02~
0.025%；Mn:0.08~0.12%；P :≤0.013%；S :≤0.004%；Al:0.024~0.057%；Remaining for Fe and
Inevitably it is mingled with.
The present invention also provides a kind of manufacturing methods of the easy pickling mild steel steel plate of CSP process, comprising the following steps: molten iron
Pretreatment, Argon station, the refining of LF furnace, CSP continuous casting, heating, high-pressure water descaling, hot rolling, section cooling, is batched converter smelting.
In the heating stepses, slab enters using low-temperature heat in roller hearth type heating furnace, and the control of slab tapping temperature exists
1000~1100 DEG C, the coefficient of excess air in the area heating furnace Nei Ge is controlled 1.05~1.30.
In the high-pressure water descaling step, control de-scaling water pressure is not less than 20MPa.
In the hot-rolled step, using the rolling of 7 rack finishing mills and low temperature open rolling, low temperature finish to gauge technique, start rolling temperature
It is 960~1000 DEG C, secondary descaling steel water of the finishing temperature control after 760~800 DEG C, F1, F2 rack is opened, between each rack
Cooling water open, mill speed be not less than 4.0m/s.
In the section cooling step, cooling velocity is 20~40 DEG C/s.
The coiling temperature is at 600~680 DEG C.
Further, batching after step further includes being air-cooled to room temperature.
The present invention in terms of composition design mainly use low C, low Si, low P, low S, C:0.020~0.050% primarily to
A large amount of Carbide Precipitations are prevented, causes band hardness of steel to increase and is deteriorated with forming property.Si≤0.030%, on the one hand in order to reduce
The solid solution strengthening effect of Si reduces band hardness of steel；On the other hand Si too high levels in order to prevent, at high temperature with FeO ining conjunction with instead
Fayalite (2FeO.SiO should be generated2), by FeO, firmly anchoring increases iron scale and removes difficulty in strip matrix surface；Mn
Content is≤0.30%, mainly for fixed S and prevents band hardness of steel excessive；P, S, can be to the forming of strip as impurity element
Performance has an adverse effect, it should which the lower strict control, content the better.Al content is that 0.020~0.060%, Al mainly makees
For deoxidier use, oxygen content in steel is reduced, on the one hand, be conducive to control the thickness of iron scale；On the other hand, AlN is controlled
Intensity effect is precipitated, prevents band hardness of steel higher.
The present invention is in heating stepses, and using low-temperature heat, heating and temperature control is at 1000~1100 DEG C, on the one hand, is
In order to avoid temperature is excessively high, the raw iron scale of furnace is thicker；On the other hand, it prevents heating temperature excessively high, generates the iron olive of melting
The fayalite of stone, molten condition can be solidified with temperature reduction and firmly anchoring increases iron scale in band steel matrix by FeO
Removal difficulty.On hot rolling technology, the high-speed rolling of low temperature open rolling, low temperature finish to gauge, mill speed not less than 4.0m/s is taken
Technique, and match reasonable coiling technique.Finishing temperature control is at 760~800 DEG C, during main purpose is controlled rolling
The iron scale thickness of generation, the iron scale thickness in strip hot rolling process depend primarily on rolling temperature and speed,
Rolling temperature is lower, mill speed is faster, and the strip iron scale speed of growth is slower, and iron scale thickness is smaller.Coiling temperature
Control is at 600~680 DEG C, primarily to improving the FeO ratio in iron scale, FeO short texture is porous, it is perishable, with
Band steel matrix adhesiveness is poor, Fe3O4Compact structure, it is corrosion-resistant, with it is good with steel matrix adhesiveness, FeO ratio is higher, Fe3O4Than
Fewer, the easier pickling of strip of example.
Using 5.348 μm of iron scale average thickness of the mild steel steel plate of 3.5m produced by the invention, FeO ratio about 15
~20%, Fe3O4Ratio about 80~85%, and the average thickness of same size mild steel steel-plate iron oxide scale of CSP common process production
Degree is 8.287 μm, Fe3O4Ratio is up to 95% or more.Relative to CSP common process, mild steel steel plate iron oxide produced by the invention
Skin thickness reduces 35% or more, and FeO ratio increases by 15~20%, and the lumber recovery of mild steel steel plate can be improved, reduce subsequent acid
It washes process acid solution dosage and time, improves pickling efficiency.
Detailed description of the invention
Fig. 1 is the thickness and pattern on the mild steel iron scale hot rolled coil head in embodiment 1；
Fig. 2 is the thickness and pattern of the mild steel iron scale hot rolled coil tail portion in embodiment 1；
Fig. 3 is the thickness and pattern on the mild steel iron scale hot rolled coil head in comparative example；
Fig. 4 is the thickness and pattern of the mild steel iron scale hot rolled coil tail portion in comparative example.
Specific embodiment
Below with reference to embodiment and Figure of description, the present invention is described in detail.
Examples 1 to 3
A kind of easy pickling mild steel steel plate of CSP process, chemical component and weight percent are as shown in table 1.
The chemical component (weight percent, wt%) of 1 embodiment of table and comparative example middle low carbon steel steel plate
The preparation method of the easy pickling mild steel steel plate of CSP process is the following steps are included: molten iron pretreatment, converter smelting
Refining, the refining of LF furnace, CSP continuous casting, heating, high-pressure water descaling, hot rolling, section cooling, batches, is air-cooled to room temperature at Argon station.Control
Thickness of strand is 70mm, and controls heating, high-pressure water descaling, hot rolling, section cooling, the technological parameter such as table 2 for batching step
Shown, embodiment and comparative example iron scale thickness are as shown in table 3, and embodiment and comparative example iron scale composition compare such as table
Shown in 4.
2 embodiment of table and comparative example roll fabrication process parameters
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example | |
| Heating and tapping temperature (DEG C) | 1086 | 1095 | 1089 | 1150 |
| Coefficient of excess air | 1.08 | 1.15 | 1.25 | 1.29 |
| De-scaling water pressure (MPa) | 20 | 25 | 28 | 30 |
| Start rolling temperature (DEG C) | 968 | 991 | 985 | 1100 |
| Finishing temperature (DEG C) | 785 | 781 | 779 | 881 |
| Mill speed (m/s) | 4.2 | 4.8 | 4.6 | 4.2 |
| Cooling velocity (DEG C/s) | 26 | 25 | 30 | 29 |
| Coiling temperature (DEG C) | 661 | 654 | 669 | 681 |
3 embodiment of table and comparative example iron scale thickness
4 embodiment of table and comparative example iron scale form Phase Proportion
| Number | FeO (%) | Fe3O4(%) |
| Embodiment 1 | 15~20 | 80~85 |
| Embodiment 2 | 10~15 | 85~90 |
| Embodiment 3 | 8~13 | 87~92 |
| Comparative example | <5 | >95 |
Mild steel steel plate from the embodiment and comparative example that can be seen that same size in table 3 and table 4, the present invention are raw
The comparative example that the mild steel steel-plate iron oxide scale thickness of production compares reduces 35~40%, FeO ratio increase by 15~20%, of the invention
The lumber recovery that mild steel steel plate can be improved reduces subsequent pickling process acid solution dosage and time, improves pickling efficiency.
It is above-mentioned to be retouched in detail referring to embodiment to what a kind of easy pickling mild steel steel plate of CSP process and its manufacturing method carried out
It states, is illustrative without being restrictive, several embodiments can be enumerated according to limited range, therefore do not departing from this
Change and modification under invention general plotting should belong within protection scope of the present invention.
Claims (9)
1. a kind of easy pickling mild steel steel plate of CSP process, which is characterized in that its chemical component and weight percent are as follows: C:0.020
~0.050%；Si :≤0.030%；Mn :≤0.30%；P :≤0.015%；S :≤0.010%；Al:0.020~0.060%；
Remaining is Fe and is inevitably mingled with.
2. the easy pickling mild steel steel plate of CSP process according to claim 1, which is characterized in that its chemical component and weight
Percentage are as follows: C:0.024~0.048%；Si:0.02~0.025%；Mn:0.08~0.12%；P :≤0.013%；S :≤
0.004%；Al:0.024~0.057%；Remaining is Fe and is inevitably mingled with.
3. a kind of manufacturing method of the easy pickling mild steel steel plate of CSP process, which is characterized in that the manufacturing method includes following step
It is rapid: molten iron pretreatment, converter smelting, Argon station, the refining of LF furnace, CSP continuous casting, heating, high-pressure water descaling, hot rolling, section cooling,
It batches.
4. manufacturing method according to claim 3, which is characterized in that in the heating stepses, slab enters roller-bottom type and adds
Low-temperature heat is used in hot stove, the control of slab tapping temperature is at 1000~1100 DEG C, the coefficient of excess air in the area heating furnace Nei Ge
Control is 1.05~1.30.
5. manufacturing method according to claim 3, which is characterized in that in the high-pressure water descaling step, control de-scaling water
Pressure is not less than 20MPa.
6. manufacturing method according to claim 3, which is characterized in that in the hot-rolled step, rolled using 7 rack finishing mills
System and low temperature open rolling, low temperature finish to gauge technique, start rolling temperature be 960~1000 DEG C, finishing temperature control at 760~800 DEG C,
Secondary descaling steel water after F1, F2 rack is opened, and the cooling water between each rack is opened, and mill speed is not less than 4.0m/s.
7. manufacturing method according to claim 3, which is characterized in that in the section cooling step, cooling velocity 20
~40 DEG C/s.
8. manufacturing method according to claim 3, which is characterized in that the coiling temperature is at 600~680 DEG C.
9. manufacturing method according to claim 3, which is characterized in that batching after step further includes being air-cooled to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811122283.1A CN109097700B (en) | 2018-09-26 | 2018-09-26 | Low-carbon steel plate easy to pickle in CSP process and manufacturing method thereof |
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| CN201811122283.1A CN109097700B (en) | 2018-09-26 | 2018-09-26 | Low-carbon steel plate easy to pickle in CSP process and manufacturing method thereof |
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| CN109097700B CN109097700B (en) | 2020-09-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109940043A (en) * | 2019-04-09 | 2019-06-28 | 唐山市德龙钢铁有限公司 | A kind of preparation method of easy pickled hot strip |
| CN111575465A (en) * | 2020-05-13 | 2020-08-25 | 武汉钢铁有限公司 | Production method for preventing surface of hot-rolled pickled steel from blackening |
| CN111944974A (en) * | 2020-07-23 | 2020-11-17 | 武汉钢铁有限公司 | Method for producing thin-specification strip steel with good surface quality based on CSP (compact strip production) process |
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| CN111575465A (en) * | 2020-05-13 | 2020-08-25 | 武汉钢铁有限公司 | Production method for preventing surface of hot-rolled pickled steel from blackening |
| CN111944974A (en) * | 2020-07-23 | 2020-11-17 | 武汉钢铁有限公司 | Method for producing thin-specification strip steel with good surface quality based on CSP (compact strip production) process |
| CN111944974B (en) * | 2020-07-23 | 2022-05-03 | 武汉钢铁有限公司 | Method for producing thin-specification strip steel with good surface quality based on CSP (compact strip production) process |
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