CN108941494A - A kind of Process of Hot Transfering And Hot Charging of cut deal continuous casting billet - Google Patents
A kind of Process of Hot Transfering And Hot Charging of cut deal continuous casting billet Download PDFInfo
- Publication number
- CN108941494A CN108941494A CN201811114412.2A CN201811114412A CN108941494A CN 108941494 A CN108941494 A CN 108941494A CN 201811114412 A CN201811114412 A CN 201811114412A CN 108941494 A CN108941494 A CN 108941494A
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- continuous casting
- hot
- casting billet
- cut deal
- hot charging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
A kind of Process of Hot Transfering And Hot Charging of cut deal continuous casting billet, through control cut deal continuous casting billet surface chill thickness degree between 2 ~ 5mm, then heated, control surface oxide layer thickness >=5mm, it is removed continuous casting billet surface chill layer by oxidation, de-scaling, to successfully avoid the surface star check problem generated during the rolling process after cut deal hot charging and hot rolling of continuous casting slab.The method of the present invention expands the temperature range of cut deal hot charging and hot rolling of continuous casting slab, and to the applied widely of steel grade, production technology has operability, to effectively promote the close-coupled integration production of cut deal, reduces cost, increases benefit.
Description
Technical field
The invention belongs to Heavy Plate Production technical fields, more particularly to a kind of hot delivery and hot charging work of cut deal continuous casting billet
Skill.
Background technique
In steel production technology, hot delivery and hot charging technology can reduce the energy consumption of billet reheat process, simplify production
Process and raising rhythm of production, reduce blank inventory plant area and labour's investment, thus hot delivery and hot charging technology can be significant
Reduce production cost.
However to certain steel grades, especially containing the micro alloyed steel of Ti, Nb, after continuous casting billet uses Process of Hot Transfering And Hot Charging, thick
Star check problem in surface is easy to happen during rolling.Some researches show that surface temperature is when two-phase section carries out hot delivery and hot charging, through Ovshinsky
After bodyization heating, it is easy to cause in casting billet surface metal at austenite grain boundary that there are still pro-eutectoid ferrite film (also referred to as imitative crystal boundaries
Ferrite), and along with the precipitation of second phase such as carbonitride, the thermoplasticity of combination interface is reduced, is split in the operation of rolling
Line is easy to be formed and extended in these regions.According to practical experience, cut deal continuous casting billet when rolling reduction is to 1.5 ~ 2.5,
Surface starts star check occur, crack depth generally away from 1 ~ 2mm of surface within.The flowing rule of surface metal when being rolled by thick rolled piece
Rule infers the weakness zone of star check generation substantially within the scope of 2 ~ 8mm of continuous casting billet surface, and the significant feature in one, this region is exactly
The transition of the tiny isometric coarse column crystal of crystal orientation middle layer of continuous casting billet chill.
For the hot delivery and hot charging for realizing continuous casting billet, Chinese patent CN102228968B is proposed on continuous caster roller way to continuous casting billet
Surface is rapidly cooled, and is lower than continuous casting billet skin temperatureA r1And avoid two-phase section.Obvious this method changes continuous casting billet
The structural state of chill and isometric crystal orientation column crystal transition region, to imitate the generation of grain boundary ferrite when surface being avoided to heat
With the generation of surface star check when rolling, but this method will increase the thermal stress and structural stress of casting billet surface, may cause casting
There are other defects and slab is caused to be risen again deforming with heating process in base surface, also affects the energy conservation effect of hot delivery and hot charging
Fruit, and need fast cool equipment of increasing input on continuous caster roller way.
Summary of the invention
The purpose of the present invention is to provide a kind of Process of Hot Transfering And Hot Charging of cut deal continuous casting billet, to avoid hot delivering technology of CC billets heat
Blank surface generates star check during the rolling process after dress.
Technical solution of the present invention:
A kind of Process of Hot Transfering And Hot Charging of cut deal continuous casting billet, 180 ~ 300mm of thickness of strand, 1870 ~ 2280mm of width are crucial
Process includes:
1) continuous casting: using straight mold type caster, and steel temperature is poured in raising, and the control degree of superheat is 20 ~ 40 DEG C；It is cooling strong to reduce crystallizer
Degree, the cooling disengaging water temperature difference of control crystallizer is 4 ~ 6 DEG C；Control Water Rate for Secondary Cooling Water is 0.6 ~ 0.8L/kg；Using dynamic soft-reduction
Improve center segregation with electromagnetic agitation, slighter compress amount is 3% ~ 5%, and stir current is 450 ~ 500A, and stirring frequency is 5 ~ 6Hz.
2) hot delivery and hot charging: continuous casting billet skin temperature is 400 ~ 900 DEG C when into heating furnace.
3) heat: use walking beam heating furnace, preheating section fire box temperature >=900 DEG C, continuous casting billet come out of the stove center portion temperature >=
1200 DEG C, time inside furnace >=5h；Controlling furnace air coefficient of excess is 1.3 ~ 1.4；Using mixed gas, calorific value is 8500 ~
9500kJ/m3。
4) just de-scaling: de-scaling water pressure >=220bar, de-scaling speed≤1m/s.
The present invention is then heated by controlling cut deal continuous casting billet surface chill thickness degree between 2 ~ 5mm, controls surface
Oxidated layer thickness >=5mm is removed continuous casting billet surface chill layer by oxidation, dephosphorization, to successfully avoid cut deal company
The surface star check problem generated during the rolling process after slab hot delivery and hot charging.Therefore, the present invention is with beneficial effect: expanding
The temperature range of cut deal hot charging and hot rolling of continuous casting slab, and to the applied widely of steel grade, production technology has operability, from
And the close-coupled integration production of cut deal is effectively promoted, realizing reduces increased costs benefit.
Specific embodiment
The present invention is further illustrated by the following examples.
Embodiment 1
Certain Heavy Plate Plant is practiced using Process of Hot Transfering And Hot Charging of the invention, and selection steel grade is middle carbon microalloy steel A32, continuous casting
Base includes: with a thickness of 260mm, width 2070mm, critical process step
1) continuous casting: using straight mold type caster, and pouring the steel degree of superheat is 30 DEG C；The cooling disengaging water temperature difference of crystallizer: extrados 4.9
DEG C, intrados is 5.0 DEG C, and two leptoprosopy are respectively 4.9 DEG C and 5.2 DEG C；Water Rate for Secondary Cooling Water is 0.68L/kg；Dynamic soft-reduction amount is
10mm, electromagnetic agitation electric current are 480A, frequency 6Hz.
2) hot delivery and hot charging: continuous casting billet skin temperature is 650 DEG C when into heating furnace.
3) it heats: using walking beam heating furnace, preheating section fire box temperature is 910 ~ 930 DEG C, and continuous casting billet is come out of the stove center portion temperature
Degree is 1220 DEG C, time inside furnace 350min；Coefficient of excess air is 1.35 in heating furnace；Using coke-stove gas+coal gas of converter+
The mixed gas of blast furnace gas, calorific value are 8800 ~ 9000kJ/m3。
4) just de-scaling: de-scaling water pressure is 230bar, and de-scaling process pressure drop maximum 5bar, de-scaling speed is 0.9m/s.
Rolling rear steel plate thickness is 25mm, and surface of steel plate does not find star check.
Embodiment 2
Certain Heavy Plate Plant is practiced using Process of Hot Transfering And Hot Charging of the invention, and selection steel grade is middle carbon microalloy steel Q370R, even
Slab thickness is 180mm, width 1870mm, and critical process step includes:
1) continuous casting: using straight mold type caster, and pouring the steel degree of superheat is 23 ~ 25 DEG C；Crystallizer, which cools down, passes in and out water temperature difference: extrados is
5.8 DEG C, intrados is 5.6 DEG C, and two leptoprosopy are respectively 5.9 DEG C and 5.8 DEG C；Water Rate for Secondary Cooling Water is 0.65L/kg；Dynamic soft-reduction
Amount is 8mm, and electromagnetic agitation electric current is 450A, frequency 5Hz.
2) hot delivery and hot charging: continuous casting billet skin temperature is 580 DEG C when into heating furnace.
3) it heats: using walking beam heating furnace, preheating section fire box temperature is 910 ~ 930 DEG C, and continuous casting billet is come out of the stove center portion temperature
Degree is 1210 DEG C, time inside furnace 320min；Coefficient of excess air is 1.35 in heating furnace；Using coke-stove gas+coal gas of converter+
The mixed gas of blast furnace gas, calorific value are 9000 ~ 9200kJ/m3。
4) just de-scaling: de-scaling water pressure is 230bar, and de-scaling process pressure drop maximum 2bar, de-scaling speed is 1.0m/s.
Rolling rear steel plate thickness is 10mm, and surface of steel plate does not find star check.
Embodiment 3
Certain Heavy Plate Plant is practiced using Process of Hot Transfering And Hot Charging of the invention, and selection steel grade is low-carbon weathering steel Q420qENH,
Thickness of strand is 220mm, width 2070mm, and critical process step includes:
1) continuous casting: using straight mold type caster, and pouring the steel degree of superheat is 27 ~ 28 DEG C；Crystallizer, which cools down, passes in and out water temperature difference: extrados is
5.3 DEG C, intrados is 5.3 DEG C, and two leptoprosopy are respectively 5.8 DEG C and 5.7 DEG C；Water Rate for Secondary Cooling Water is 0.70L/kg；Dynamic soft-reduction
Amount is 8mm, and electromagnetic agitation electric current is 460A, frequency 5.5Hz.
2) hot delivery and hot charging: continuous casting billet skin temperature is 750 DEG C when into heating furnace.
3) it heats: using walking beam heating furnace, preheating section fire box temperature is 915 ~ 930 DEG C, and continuous casting billet is come out of the stove center portion temperature
Degree is 1225 DEG C, time inside furnace 325min；Coefficient of excess air is 1.35 in heating furnace；Using coke-stove gas+coal gas of converter+
The mixed gas of blast furnace gas, calorific value are 8950 ~ 9120kJ/m3。
4) just de-scaling: de-scaling water pressure is 230bar, and de-scaling process pressure drop maximum 4bar, de-scaling speed is 0.9m/s.
Rolling rear steel plate thickness is 24mm, and surface of steel plate does not find star check.
Embodiment 4
Certain Heavy Plate Plant is practiced using Process of Hot Transfering And Hot Charging of the invention, and selection steel grade is Ultra-low carbon pipe line steel X70, continuous casting
Base includes: with a thickness of 300mm, width 2280mm, critical process step
1) continuous casting: using straight mold type caster, and pouring the steel degree of superheat is 25 DEG C；The cooling disengaging water temperature difference of crystallizer: extrados 4.5
DEG C, intrados is 4.6 DEG C, and two leptoprosopy are 4.2 DEG C；Water Rate for Secondary Cooling Water is 0.75L/kg；Dynamic soft-reduction amount is 12mm, electromagnetism
Stir current is 500A, frequency 6Hz.
2) hot delivery and hot charging: continuous casting billet skin temperature is 680 DEG C when into heating furnace.
3) it heats: using walking beam heating furnace, preheating section fire box temperature is 920 ~ 935 DEG C, and continuous casting billet is come out of the stove center portion temperature
Degree is 1210 DEG C, time inside furnace 360min；Coefficient of excess air is 1.35 in heating furnace；Using coke-stove gas+coal gas of converter+
The mixed gas of blast furnace gas, calorific value are 8550 ~ 8650kJ/m3。
4) just de-scaling: de-scaling water pressure is 230bar, and de-scaling process pressure drop maximum 5bar, de-scaling speed is 0.8m/s.
Rolling rear steel plate thickness is 29.7mm, and surface of steel plate does not find star check.
Embodiment 5
Certain Heavy Plate Plant is practiced using Process of Hot Transfering And Hot Charging of the invention, and selection steel grade is the weather-proof mould steel P20 of high-carbon, even
Slab thickness is 300mm, width 2070mm, and critical process step includes:
1) continuous casting: using straight mold type caster, and pouring the steel degree of superheat is 35 ~ 38 DEG C；Crystallizer, which cools down, passes in and out water temperature difference: extrados is
4.3 DEG C, intrados is 4.6 DEG C, and two leptoprosopy are respectively 4.4 DEG C and 4.7；Water Rate for Secondary Cooling Water is 0.64L/kg；Dynamic soft-reduction amount
For 12mm, electromagnetic agitation electric current is 500A, frequency 6Hz.
2) hot delivery and hot charging: continuous casting billet skin temperature is 800 DEG C when into heating furnace.
3) it heats: using walking beam heating furnace, preheating section fire box temperature is 925 ~ 940 DEG C, and continuous casting billet is come out of the stove center portion temperature
Degree is 1240 DEG C, time inside furnace 365min；Coefficient of excess air is 1.35 in heating furnace；Using coke-stove gas+coal gas of converter+
The mixed gas of blast furnace gas, calorific value are 8650 ~ 8800kJ/m3。
4) just de-scaling: de-scaling water pressure is 230bar, and de-scaling process pressure drop maximum 4bar, de-scaling speed is 0.8m/s.
Rolling rear steel plate thickness is 68mm, and surface of steel plate does not find star check.
Claims (1)
1. a kind of Process of Hot Transfering And Hot Charging of cut deal continuous casting billet, 180 ~ 300mm of thickness of strand, 1870 ~ 2280mm of width are special
Sign is that critical process step includes:
1) continuous casting: using straight mold type caster, and steel temperature is poured in raising, and the control degree of superheat is 20 ~ 40 DEG C；It is cooling strong to reduce crystallizer
Degree, the cooling disengaging water temperature difference of control crystallizer is 4 ~ 6 DEG C；Control Water Rate for Secondary Cooling Water is 0.6 ~ 0.8L/kg；Using dynamic soft-reduction
Improve center segregation with electromagnetic agitation, slighter compress amount is 3% ~ 5%, and stir current is 450 ~ 500A, and stirring frequency is 5 ~ 6Hz；
2) hot delivery and hot charging: continuous casting billet skin temperature is 400 ~ 900 DEG C when into heating furnace；
3) it heats: using walking beam heating furnace, preheating section fire box temperature >=900 DEG C, continuous casting billet is come out of the stove center portion temperature >=1200
DEG C, time inside furnace >=5h；Controlling furnace air coefficient of excess is 1.3 ~ 1.4；Using mixed gas, calorific value is 8500 ~ 9500kJ/
m3；
4) just dephosphorization: dephosphorization water pressure >=220bar, de-scaling speed≤1m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811114412.2A CN108941494B (en) | 2018-09-25 | 2018-09-25 | Hot-feeding and hot-charging process for medium-thickness plate continuous casting billet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811114412.2A CN108941494B (en) | 2018-09-25 | 2018-09-25 | Hot-feeding and hot-charging process for medium-thickness plate continuous casting billet |
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| CN108941494A true CN108941494A (en) | 2018-12-07 |
| CN108941494B CN108941494B (en) | 2020-07-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115194114A (en) * | 2022-06-02 | 2022-10-18 | 南京钢铁股份有限公司 | Continuous casting billet surface heat treatment method |
| CN115341129A (en) * | 2022-08-01 | 2022-11-15 | 南京钢铁股份有限公司 | Micro-alloyed low-alloy structural steel hot-feeding and hot-charging production method |
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| JPH0642979B2 (en) * | 1989-02-20 | 1994-06-08 | 新日本製鐵株式会社 | Manufacturing method of high strength steel for welding and low temperature containing titanium oxide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115194114A (en) * | 2022-06-02 | 2022-10-18 | 南京钢铁股份有限公司 | Continuous casting billet surface heat treatment method |
| CN115341129A (en) * | 2022-08-01 | 2022-11-15 | 南京钢铁股份有限公司 | Micro-alloyed low-alloy structural steel hot-feeding and hot-charging production method |
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| CN108941494B (en) | 2020-07-07 |
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