CN106756507B - The method for producing Thin Specs high-carbon steel based on ESP bar strip continuous casting and rolling flow paths - Google Patents
The method for producing Thin Specs high-carbon steel based on ESP bar strip continuous casting and rolling flow paths Download PDFInfo
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The present invention provides a kind of method producing Thin Specs high-carbon steel based on ESP bar strip continuous casting and rolling flow paths, including molten iron pretreatment, converter smelting, the refining of LF stoves, ESP continuous casting and rollings, cooling, decarburization, dephosphorization, desulfurization and deoxidation alloy are carried out to molten iron in converter；In LF stove refining process, deoxidation, desulfurization and inclusion removal are carried out in LF stoves；The mass ratio of ingredient of molten steel after the refining of LF stoves is：C：0.48~0.54%, Si：0.15~0.25%, Mn：0.50~0.80%, Cr：0.16~0.20%, P：≤ 0.012%, S：≤ 0.003%, N：≤ 0.005%；Hot-strip of the molten steel to be formed by ESP continuous casting and rollings at different-thickness will be refined from LF stoves；Roughing outlet temperature is 900~960 DEG C, and the temperature of finish rolling outlet is 800~860 DEG C；It using section cooling hot-strip to 640~740 DEG C, is batched subsequently into coiling machine, outbound after slow cooling.Using the present invention, the problems such as traditional hot rolling is of high cost, energy consumption is big, atmospheric corrosion is solved, achievees the purpose that energy conservation and environmental protection and reduces cost.
Description
Technical field
The present invention relates to metal material processings and field shaping technique, more specifically, are related to a kind of based on ESP sheet billets
The method that continuous casting and rolling flow produces Thin Specs high-carbon steel.
Background technology
In recent years, persistently dropping with steel market, steel are constantly in meagre profit or without sharp states, force steel producer
Have to inquire into the roads Jiang Benzhi, and the country at present further strengthens the attention degree of environmental protection, environmental requirement is again unprecedented stringent, because
This inquires into drop originally and the process for producing steel and iron of environmental protection has become the road of very necessary existence.
It makes full use of ESP development and application new products to meet national overall planning and sector planning, meets national modulation wound phase
Policy Conditions are closed, disclosure satisfy that technique modernization, equipment enlarging, production intensification, resource and energy cycleization, energy consumption are minimum
Change, the optimized high start developing goal of economic benefit, for promoting steel industry energy-saving and emission-reduction and technological progress, promotes enterprise
Transition and upgrade, scientific and technical innovation and product restructuring, all have a very important significance.
High-carbon Fine Steel Casting iron is widely used to the necks such as engineering machinery, special equipment, high-end saw blade and special implement
Domain.High-quality high-carbon alloy steel production technology is mainly given birth to traditional heavy slab hot continuous rolling and CSP thin slab continuous rollings both at home and abroad at present
Production technology, there are the segregations of element in strand for production process seriously, surface of steel plate decarburized layer is serious, board dimension low precision, property
The shortcomings of stabilizability is poor, these problems directly affect the quality problem of process heat treatment process after steel plate, steel plate are caused to move back
Steel plate annealing nodularization is incomplete or the problems such as quenching hardness is uneven after fire or modifier treatment.
Therefore, the present invention proposes a kind of method producing Thin Specs high-carbon steel based on ESP bar strip continuous casting and rolling flow paths.
Invention content
In view of the above problems, the object of the present invention is to provide one kind producing thin rule based on ESP bar strip continuous casting and rolling flow paths
The method of lattice high-carbon steel reaches energy conservation and environmental protection and reduces the mesh of cost to solve the problems such as traditional hot rolling is of high cost, energy consumption is big
's.
The present invention provides a kind of method producing Thin Specs high-carbon steel based on ESP bar strip continuous casting and rolling flow paths, including：Iron
Water pretreatment, converter smelting, the refining of LF stoves, ESP continuous casting and rollings, cooling, wherein
Molten iron is pre-processed by molten iron the sulphur in molten iron being reduced to≤0.020%；
In converter steelmaking process, decarburization, dephosphorization, desulfurization and deoxidation alloy are carried out to molten iron in converter；Wherein,
The mass ratio of the ingredient of molten steel after converter is：C：0.08~0.15%, Si：≤ 0.03%, Mn：0.10~0.20%, P：≤
0.03%, S：≤ 0.06%；
In LF stove refining process, deoxidation, desulfurization and inclusion removal are carried out in LF stoves；Wherein, after the refining of LF stoves
The mass ratio of ingredient of molten steel be：C：0.48~0.54%, Si：0.15~0.25%, Mn：0.50~0.80%, Cr：0.16
~0.20%, P：≤ 0.012%, S：≤ 0.003%, N：≤ 0.005%；
Hot-strip of the molten steel to be formed by ESP continuous casting and rollings at different-thickness will be refined from LF stoves；Wherein, roughing goes out
Mouth temperature is 900~960 DEG C, and the temperature of finish rolling outlet is 800~860 DEG C；
Using section cooling hot-strip to 640~740 DEG C, batched as coiled strip steel, coiled band subsequently into coiling machine
Outbound after steel slow cooling.
Furthermore it is preferred that scheme be that the tapping temperature of converter is 1620~1660 DEG C, and the quantity of slag is under the converter：≤
40mm uses Argon in tapping process；Wherein,
During deoxidation alloying, the aluminium ingot of 100~300Kg is added, and carburant, ferrosilicon, high carbon ferro-chrome, silicon is added
Alloying of manganese.
Furthermore it is preferred that scheme be to carry out deoxidation, desulfurization in LF stoves and during inclusion removal, LF refining slag
For：≤ 1.0%, dual alkalinity >=7.0, inclusion behavior is：≤ 2.0 grades, also, liquid steel temperature control is 1558~1568
℃。
Furthermore it is preferred that scheme be that the molten steel from ladle to tundish is cast into strand in ESP continuous castings, wherein use
Flat submersed nozzle, funnel-type crystallizer, two is cold using dynamic water allocation；
Casting blank surface temperature >=950 DEG C, cross section surface temperature difference≤70 DEG C, the liquid steel temperature of tundish is 1518~
1528 DEG C, 3.5~6.0m/min of Casting speed, go out crystallizer slab thickness 90mm~110mm.
Furthermore it is preferred that scheme be, in the ESP hot rollings of ESP producing lines, roughing inlet temperature be 950~1050 DEG C,
The temperature of sensing heating outlet is 1120~1180 DEG C, and workpiece thickness is 8~20mm after roughing.
Furthermore it is preferred that scheme be that the thickness of hot-strip is 1.5~3.5mm.
Furthermore it is preferred that scheme be, hot-strip slow cooling be≤200 DEG C, temperature retention time be 48 hours.
From technical solution above it is found that provided by the invention produce Thin Specs based on ESP bar strip continuous casting and rolling flow paths
The method of high-carbon steel, casting blank solidification speed is fast, as-cast structure is more uniform, Segregation of Chemical Composition is small, and strand is without soaking stove heat
Realize direct casting, strand is low in operation of rolling temperature, and rolling time is short, helps to reduce plate surface decarburization, refinement pearly-lustre
Body piece interlamellar spacing can obviously eliminate skin decarburization, thickness existing for traditional process production high-carbon strip and CSP thin slab continuous rollings
The problems such as dimensional tolerance is big and structure property is unstable.In addition, the technological process of production is short, belong to low energy consumption green manufacturing technique
Scope, hot-rolled state can reach 1.5mm Ultra-thin bands, can reduce cold rolling process rolling pass, reaches and is saved " with Bao Daihou "
The purpose that can be lowered consumption.
To the accomplishment of the foregoing and related purposes, one or more aspects of the present invention includes the spy being particularly described below
Sign.Certain illustrative aspects of the invention is described in detail in the following description and the annexed drawings.However, these aspect instructions are only
It is that some of the various ways in the principles of the present invention can be used.In addition, the present invention is intended to include all such aspects with
And their equivalent.
Description of the drawings
By reference to the content of the explanation below in conjunction with attached drawing, and with a fuller understanding of the present invention, the present invention
Other purposes and result will be more clearly understood and understood.In the accompanying drawings：
Fig. 1 is the side that Thin Specs high-carbon steel is produced based on ESP bar strip continuous casting and rolling flow paths according to the embodiment of the present invention
Method flow diagram.
Identical label indicates similar or corresponding feature or function in all the appended drawings.
Specific implementation mode
In the following description, for purposes of illustration, it in order to provide the comprehensive understanding to one or more embodiments, explains
Many details are stated.It may be evident, however, that these embodiments can also be realized without these specific details.
For aforementioned proposition traditional hot rolling cost high energy consumption it is big the problems such as, the present invention, which proposes, a kind of being based on ESP thin plates
The method that continuous-casting tandem-rolling flow produces Thin Specs high-carbon steel, can produce ultra-thin strip using this technique, can reduce Cold-roller
Sequence rolling pass, achieve the purpose that it is energy-saving " with Bao Daihou ", have very high economic results in society.
Wherein, ESP (Endless Strip Production, strip production without a head) producing line is newly-built new of AVM hereinafter enlightening
Generation sheet billet continuous casting and rolling production line, a whole steel band can be produced by casting since it is primary, the no any cutting head cutting tail in centre,
Thus have the advantages that the production of Total continuity strip, single continuous casting line have outstanding production capacity, large-scale production band broadband greatly
The features such as steel and quality strip steel, the conversion cost from molten steel to hot rolled coil are low, production-line technique arrangement is the compactest.
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In order to illustrate it is provided by the invention based on ESP bar strip continuous casting and rolling flow paths produce Thin Specs high-carbon steel method,
Fig. 1 shows the method stream according to the ... of the embodiment of the present invention that Thin Specs high-carbon steel is produced based on ESP bar strip continuous casting and rolling flow paths
Journey.
As shown in Figure 1, the method provided by the invention for producing Thin Specs high-carbon steel based on ESP bar strip continuous casting and rolling flow paths
Including：Molten iron pretreatment, converter smelting, the refining of LF stoves, ESP continuous casting and rollings, cooling, wherein
S110：Molten iron is pre-processed by molten iron the sulphur in molten iron being reduced to≤0.020%；
S120：In converter steelmaking process, decarburization, dephosphorization, desulfurization and deoxidation alloy are carried out to molten iron in converter；
Wherein, the mass ratio of the ingredient of the molten steel after converter is：C：0.08~0.15%, Si：≤ 0.03%, Mn：0.10~0.20%,
P：≤ 0.03%, S：≤ 0.06%；
S130：In LF stove refining process, deoxidation, desulfurization and inclusion removal are carried out in LF stoves；Wherein, LF stoves essence
The mass ratio of the ingredient of molten steel after refining is：C：0.48~0.54%, Si：0.15~0.25%, Mn：0.50~0.80%, Cr：
0.16~0.20%, P：≤ 0.012%, S：≤ 0.003%, N：≤ 0.005%；
S140：Hot-strip of the molten steel to be formed by ESP continuous casting and rollings at different-thickness will be refined from LF stoves；Wherein,
Roughing outlet temperature is 900~960 DEG C, and the temperature of finish rolling outlet is 800~860 DEG C；
S150：Using section cooling hot-strip to 640~740 DEG C, batched as coiled strip steel subsequently into coiling machine, at
Outbound after coiled strip steel slow cooling.
Above-mentioned steps are that the specific method using ESP Process Production high-carbon steel passes through iron in the step S110 of the present invention
Sulphur in molten iron is reduced to≤0.020% by water pretreatment, mitigates the desulfurization pressure of converter and LF stoves.
In the step s 120, molten iron is carried out decarburization, dephosphorization and desulfurization, phosphorus control≤0.12% by stove in converter.Simultaneously
Deoxidation alloying is carried out, the molten steel of LF stoves suitable component and suitable temperature is supplied to.Specifically, using 300t top and bottom combined blown converters
It smelts, molten iron is subjected to decarburization, dephosphorization and desulfurization in converter, converter terminal controls [C] 0.08%~0.15%, [Si]≤
0.03%, [Mn] 0.10%~0.20%, [P]≤0.03%, [S]≤0.06%, 1620~1660 DEG C of tapping temperature, tapping is adopted
It is operated with slide plate pushing off the slag, controls the quantity of slag≤40mm under converter, tapping process is using whole Argon, deoxidation alloying：Aluminium ingot is added
100~300Kg, carburant, ferrosilicon, high carbon ferro-chrome, silicomangan push up 1~2 ton of slag.
In step s 130, LF stoves carry out deoxidation, desulfurization, alloying, inclusion removal, LF refining slag (FeO)≤
1.0%, dual alkalinity >=7.0 control inclusion behavior≤2.0 grade.Refining terminates liquid steel temperature and controls at 1558~1568 DEG C,
Molten steel composition controls：[C] 0.48%~0.54%, [Si] 0.15~0.25%, [Mn] 0.50~0.80%, [Cr] 0.16~
0.20%, [P]≤0.012%, [S]≤0.003%, [N]≤0.005%.
In step S140, ESP continuous castings：The casting of suitable cross-section will be cast into the molten steel of middle packet from ladle in ESP continuous castings
Base.Submersed nozzle uses the flat special mouth of a river, and crystallizer is infundibulate, carries out wick-containing pressure in straight segmental arc, fan-shaped section is moved again
State slighter compress, two is cold using dynamic water allocation.Ensure suitable pulling rate, goes out the segregation of fan-shaped section strand non-stop layer, casting blank surface temperature
>=950 DEG C, cross section surface temperature difference≤70 DEG C.1518~1528 DEG C of molten steel temperature in tundish, 3.5~6.0m/ of Casting speed
Min goes out crystallizer slab thickness 90mm~110mm.
ESP hot rollings：By three rack roughing, electromagnetic induction heating furnace, high pressure water dephosphorization, five rack finish rolling, layer is cold and rolls up
Take the thickness that strand is rolled into customer demand.950 DEG C~1050 DEG C of roughing inlet temperature, roughing outlet temperature 900 DEG C~960
DEG C, workpiece thickness 8mm~20mm after roughing；1120 DEG C~1180 DEG C of sensing heating outlet temperature；Finish rolling：It is depressed by finish rolling
Amount distribution, the hot rolling of rolling 1.5mm~3.5mm thickness specifications, 800 DEG C~860 DEG C of finish rolling finishing temperature.
In step S150, section cooling：Take air-cooled strategy；Oiler temperature control is at 640 DEG C~740 DEG C；It has batched
Roll up it is offline after, product put burial pit carry out slow cooling outbound in 48 hours to≤200 DEG C.
In conclusion the present invention is to produce hot rolled thin specification high-carbon steel completely without head bar strip continuous casting and rolling flow path using ESP,
Can stable rolling produce 1.5mm~3.5mm Thin Specs hot-rolling high-strength steels, the elongated thickness of hot rolled coil is uniform, performance stablize.Using this
Technique can produce ultra-thin strip, can reduce cold rolling process rolling pass, achieve the purpose that energy-saving " with Bao Daihou ", have
Very high economic results in society.
According to the method for above-mentioned generation high-carbon steel, the present invention is further described according to following specific embodiment.
Embodiment 1
The technological process for producing S355J0W steel completely without head ESP bar strip continuous casting and rolling flow paths in embodiment is mixed iron blast
→ slow cooling → finished product is batched in → molten iron pretreatment → BOF → LF → ESP continuous casting and rollings → section cooling →.
Converter smelting：Using 300t top and bottom combined blown converter smeltings, molten iron is subjected to decarburization, dephosphorization and desulfurization in converter,
Converter terminal controls [C] 0.09%, [Si] 0.01%, [Mn] 0.10%, [P] 0.009%, [S] 0.006%, tapping temperature
1640 DEG C, tapping is operated using slide plate pushing off the slag, controls quantity of slag 40mm under converter, and tapping process uses Argon, deoxidation alloying：Add
Enter aluminium ingot 200Kg, carburant, ferrosilicon, high carbon ferro-chrome, silicomangan push up 1 ton of slag.
LF refining：Deoxidation, desulfurization, alloying, inclusion removal, LF refining slag (FeO) 0.55%, binary are carried out in LF stoves
Basicity 8.0；Refining terminates liquid steel temperature control at 1560 DEG C, and molten steel composition controls：[C] 0.52%, [Si] 0.22%, [Mn]
0.72%, [Cr] 0.19%, [P] 0.011%, [S] 0.002%, [N] 0.0035%.
ESP continuous castings：The strand of suitable cross-section will be cast into the molten steel of middle packet from ladle in ESP continuous castings.Submersed nozzle
Using the flat special mouth of a river, crystallizer is infundibulate, carries out wick-containing pressure in straight segmental arc, fan-shaped section dynamic soft-reduction again, two is cold
Using dynamic water allocation.Ensure suitable pulling rate, goes out the segregation of fan-shaped section strand non-stop layer, 980 DEG C of casting blank surface temperature, cross section table
35 DEG C of face temperature difference.1522 DEG C, Casting speed 4.8m/min of molten steel temperature in tundish, goes out crystallizer slab thickness 95mm.
ESP hot rollings：By three rack roughing, electromagnetic induction heating furnace, high pressure water dephosphorization, five rack finish rolling, layer is cold and rolls up
Take the thickness that strand is rolled into customer demand.
Roughing：980 DEG C of roughing inlet temperature, 930 DEG C of roughing outlet temperature, workpiece thickness 14mm after roughing；
Sensing heating：1180 DEG C of sensing heating outlet temperature；
De-scaling：De-scaling pressure 380bar；
Finish rolling：By finish rolling reduction distribution, the hot rolling of rolling 1.5mm thickness specifications, finish rolling finishing temperature 850
℃；
Section cooling：Take air-cooled strategy；
It batches：Oiler temperature control is at 700 DEG C
Slow cooling：Batched volume it is offline after, product put burial pit carry out slow cooling outbound in 48 hours to≤200 DEG C.
The performance of the high-carbon steel of generation is as shown in table 1：
Table 1
Embodiment 2
The technological process for producing S355J0W steel completely without head ESP bar strip continuous casting and rolling flow paths in embodiment is mixed iron blast
→ slow cooling → finished product is batched in → molten iron pretreatment → BOF → LF → ESP continuous casting and rollings → section cooling →.
Converter smelting：Using 300t top and bottom combined blown converter smeltings, molten iron is subjected to decarburization, dephosphorization and desulfurization in converter,
Converter terminal controls [C] 0.12%, [Si] 0.01%, [Mn] 0.12%, [P] 0.008%, [S] 0.0050%, tapping temperature
1650 DEG C, tapping is operated using slide plate pushing off the slag, controls quantity of slag 40mm under converter, and tapping process uses Argon deoxidation alloying：Add
Enter aluminium ingot 230Kg, carburant, ferrosilicon, high carbon ferro-chrome, silicomangan push up 1.2 tons of slag.
LF refining：Deoxidation, desulfurization, alloying, inclusion removal, LF refining slag (FeO) 0.6%, binary are carried out in LF stoves
Basicity 8.0.Refining terminates liquid steel temperature control at 1558~1568 DEG C, and molten steel composition controls：[C] 0.51%, [Si] 0.25%,
[Mn] 0.71%, [Cr] 0.17%, [P] 0.012%, [S] 0.001%, [N] 0.0032%.
ESP continuous castings：The strand of suitable cross-section will be cast into the molten steel of middle packet from ladle in ESP continuous castings.Submersed nozzle
Using the flat special mouth of a river, crystallizer is infundibulate, carries out wick-containing pressure in straight segmental arc, fan-shaped section dynamic soft-reduction again, two is cold
Using dynamic water allocation.Ensure suitable pulling rate, goes out the segregation of fan-shaped section strand non-stop layer, 990 DEG C of casting blank surface temperature, cross section table
38 DEG C of face temperature difference.1520 DEG C, Casting speed 4.85m/min of molten steel temperature in tundish, goes out crystallizer slab thickness 95mm.
ESP hot rollings：By three rack roughing, electromagnetic induction heating furnace, high pressure water dephosphorization, five rack finish rolling, layer is cold and rolls up
Take the thickness that strand is rolled into customer demand.
Roughing：990 DEG C of roughing inlet temperature, 940 DEG C of roughing outlet temperature, workpiece thickness 16mm after roughing；
Sensing heating：1170 DEG C of sensing heating outlet temperature；
De-scaling：De-scaling pressure 380bar；
Finish rolling：By finish rolling reduction distribution, the hot rolling of rolling 1.6mm thickness specifications, finish rolling finishing temperature 840
℃；
Section cooling：Take air-cooled strategy；
It batches：Oiler temperature control is at 710 DEG C
Slow cooling：Batched volume it is offline after, product put burial pit carry out slow cooling outbound in 48 hours to≤200 DEG C.
The performance of the high-carbon steel of generation is as shown in table 2：
Table 2
Embodiment 3
The technological process for producing S355J0W steel completely without head ESP bar strip continuous casting and rolling flow paths in embodiment is mixed iron blast
→ slow cooling → finished product is batched in → molten iron pretreatment → BOF → LF → ESP continuous casting and rollings → section cooling →.
Converter smelting：Using 300t top and bottom combined blown converter smeltings, molten iron is subjected to decarburization, dephosphorization and desulfurization in converter,
Converter terminal controls [C] 0.15%, [Si] 0.01%, [Mn] 0.15%, [P] 0.007%, [S] 0.0045%, tapping temperature
1650 DEG C, tapping is operated using slide plate pushing off the slag, controls quantity of slag 40mm under converter, and tapping process uses Argon, deoxidation alloying：Add
Enter aluminium ingot 240Kg, carburant, ferrosilicon, high carbon ferro-chrome, silicomangan push up 1.5 tons of slag.
LF refining：Deoxidation, desulfurization, alloying, inclusion removal, LF refining slag (FeO) 0.6%, binary are carried out in LF stoves
Basicity 8.0.Refining terminates liquid steel temperature control at 1558~1568 DEG C, and molten steel composition controls：[C] 0.53%, [Si] 0.23%,
[Mn] 0.75%, [Cr] 0.18%, [P] 0.010%, [S] 0.0015%, [N] 0.0030%.
ESP continuous castings：The strand of suitable cross-section will be cast into the molten steel of middle packet from ladle in ESP continuous castings.Submersed nozzle
Using the flat special mouth of a river, crystallizer is infundibulate, carries out wick-containing pressure in straight segmental arc, fan-shaped section dynamic soft-reduction again, two is cold
Using dynamic water allocation.Ensure suitable pulling rate, goes out the segregation of fan-shaped section strand non-stop layer, 1000 DEG C of casting blank surface temperature, cross section
45 DEG C of surface temperature difference.1525 DEG C, Casting speed 4.9m/min of molten steel temperature in tundish, goes out crystallizer slab thickness 95mm.
ESP hot rollings：By three rack roughing, electromagnetic induction heating furnace, high pressure water dephosphorization, five rack finish rolling, layer is cold and rolls up
Take the thickness that strand is rolled into customer demand.
Roughing：1000 DEG C of roughing inlet temperature, 950 DEG C of roughing outlet temperature, workpiece thickness 18mm after roughing；
Sensing heating：1160 DEG C of sensing heating outlet temperature；
De-scaling：De-scaling pressure 380bar；
Finish rolling：By finish rolling reduction distribution, the hot rolling of rolling 1.8mm thickness specifications, finish rolling finishing temperature 850
℃；
Section cooling：Take air-cooled strategy；
It batches：Oiler temperature control is at 700 DEG C
Slow cooling：Batched volume it is offline after, product put burial pit carry out slow cooling outbound in 48 hours to≤200 DEG C.
The performance of the high-carbon steel of generation is as shown in table 3：
Table 3
Embodiment 4
The technological process for producing S355J0W steel completely without head ESP bar strip continuous casting and rolling flow paths in embodiment is mixed iron blast
→ slow cooling → finished product is batched in → molten iron pretreatment → BOF → LF → ESP continuous casting and rollings → section cooling →.
Converter smelting：Using 300t top and bottom combined blown converter smeltings, molten iron is subjected to decarburization, dephosphorization and desulfurization in converter,
Converter terminal controls converter terminal and controls [C] 0.08%, [Si] 0.02%, [Mn] 0.11%, [P] 0.006%, [S]
0.0055%, 1620 DEG C of tapping temperature, tapping is operated using slide plate pushing off the slag, controls quantity of slag 40mm under converter, and tapping process uses
Argon, deoxidation alloying：Aluminium ingot 240Kg is added, carburant, ferrosilicon, high carbon ferro-chrome, silicomangan push up 1.5 tons of slag.
LF refining：Deoxidation, desulfurization, alloying, inclusion removal, LF refining slag (FeO) 0.6%, binary are carried out in LF stoves
Basicity 8.0.Refining terminates liquid steel temperature control at 1558~1568 DEG C, and molten steel composition controls：[C] 0.54%, [Si] 0.24%,
[Mn] 0.73%, [Cr] 0.20%, [P] 0.009%, [S] 0.0025%, [N] 0.004%.
ESP continuous castings：The strand of suitable cross-section will be cast into the molten steel of middle packet from ladle in ESP continuous castings.Submersed nozzle
Using the flat special mouth of a river, crystallizer is infundibulate, carries out wick-containing pressure in straight segmental arc, fan-shaped section dynamic soft-reduction again, two is cold
Using dynamic water allocation.Ensure suitable pulling rate, goes out the segregation of fan-shaped section strand non-stop layer, 1000 DEG C of casting blank surface temperature, cross section
45 DEG C of surface temperature difference.1528 DEG C, Casting speed 3.5m/min of molten steel temperature in tundish, goes out crystallizer slab thickness 95mm.
ESP hot rollings：By three rack roughing, electromagnetic induction heating furnace, high pressure water dephosphorization, five rack finish rolling, layer is cold and rolls up
Take the thickness that strand is rolled into customer demand.
Roughing：1050 DEG C of roughing inlet temperature, 960 DEG C of roughing outlet temperature, workpiece thickness 20mm after roughing；
Sensing heating：1180 DEG C of sensing heating outlet temperature；
De-scaling：De-scaling pressure 380bar；
Finish rolling：By finish rolling reduction distribution, the hot rolling of rolling 2.0mm thickness specifications, finish rolling finishing temperature 850
℃；
Section cooling：Take air-cooled strategy；
It batches：Oiler temperature control is at 740 DEG C
Slow cooling：Batched volume it is offline after, product put burial pit carry out slow cooling outbound in 48 hours to≤200 DEG C.
The performance of the high-carbon steel of generation is as shown in table 4：
Table 4
Embodiment 5
The technological process for producing S355J0W steel completely without head ESP bar strip continuous casting and rolling flow paths in embodiment is mixed iron blast
→ slow cooling → finished product is batched in → molten iron pretreatment → BOF → LF → ESP continuous casting and rollings → section cooling →.
Converter smelting：Using 300t top and bottom combined blown converter smeltings, molten iron is subjected to decarburization, dephosphorization and desulfurization in converter,
Converter terminal controls [C] 0.10%, [Si] 0.015%, [Mn] 0.13%, [P] 0.005%, [S] 0.0050%, tapping temperature
1630 DEG C, tapping is operated using slide plate pushing off the slag, controls quantity of slag 40mm under converter, and tapping process uses Argon, deoxidation alloying：Add
Enter aluminium ingot 240Kg, carburant, ferrosilicon, high carbon ferro-chrome, silicomangan push up 1.5 tons of slag.
LF refining：Deoxidation, desulfurization, alloying, inclusion removal, LF refining slag (FeO) 0.6%, binary are carried out in LF stoves
Basicity 8.0.Refining terminates liquid steel temperature control at 1558~1568 DEG C, and molten steel composition controls：[C] 0.53%, [Si] 0.21%,
[Mn] 0.74%, [Cr] 0.16%, [P] 0.0095%, [S] 0.0015%, [N] 0.0025%.
ESP continuous castings：The strand of suitable cross-section will be cast into the molten steel of middle packet from ladle in ESP continuous castings.Submersed nozzle
Using the flat special mouth of a river, crystallizer is infundibulate, carries out wick-containing pressure in straight segmental arc, fan-shaped section dynamic soft-reduction again, two is cold
Using dynamic water allocation.Ensure suitable pulling rate, goes out the segregation of fan-shaped section strand non-stop layer, 1000 DEG C of casting blank surface temperature, cross section
45 DEG C of surface temperature difference.1518 DEG C, Casting speed 6.0m/min of molten steel temperature in tundish, goes out crystallizer slab thickness 100mm.
ESP hot rollings：By three rack roughing, electromagnetic induction heating furnace, high pressure water dephosphorization, five rack finish rolling, layer is cold and rolls up
Take the thickness that strand is rolled into customer demand.
Roughing：950 DEG C of roughing inlet temperature, 920 DEG C of roughing outlet temperature, workpiece thickness 18mm after roughing；
Sensing heating：1120 DEG C of sensing heating outlet temperature；
De-scaling：De-scaling pressure 380bar；
Finish rolling：By finish rolling reduction distribution, the hot rolling of rolling 2.3mm thickness specifications, finish rolling finishing temperature 800
℃；
Section cooling：Take air-cooled strategy；
It batches：Oiler temperature control is at 640 DEG C
Slow cooling：Batched volume it is offline after, product put burial pit carry out slow cooling outbound in 48 hours to≤200 DEG C.
The performance of the high-carbon steel of generation is as shown in table 5：
Table 5
Embodiment 6
The technological process for producing S355J0W steel completely without head ESP bar strip continuous casting and rolling flow paths in embodiment is mixed iron blast
→ slow cooling → finished product is batched in → molten iron pretreatment → BOF → LF → ESP continuous casting and rollings → section cooling →.
Converter smelting：Using 300t top and bottom combined blown converter smeltings, molten iron is subjected to decarburization, dephosphorization and desulfurization in converter,
Converter terminal controls [C] 0.11%, [Si] 0.014%, [Mn] 0.15%, [P] 0.004%, [S] 0.0055%, tapping temperature
1650 DEG C, tapping is operated using slide plate pushing off the slag, controls quantity of slag 40mm under converter, and tapping process uses Argon, deoxidation alloying：Add
Enter aluminium ingot 240Kg, carburant, ferrosilicon, high carbon ferro-chrome, silicomangan push up 1.5 tons of slag.
LF refining：Deoxidation, desulfurization, alloying, inclusion removal, LF refining slag (FeO) 0.6%, binary are carried out in LF stoves
Basicity 8.0.Refining terminates liquid steel temperature control at 1558~1568 DEG C, and molten steel composition controls：[C] 0.50%, [Si] 0.20%,
[Mn] 0.78%, [Cr] 0.18%, [P] 0.0085%, [S] 0.0010%, [N] 0.002%.
ESP continuous castings：The strand of suitable cross-section will be cast into the molten steel of middle packet from ladle in ESP continuous castings.Submersed nozzle
Using the flat special mouth of a river, crystallizer is infundibulate, carries out wick-containing pressure in straight segmental arc, fan-shaped section dynamic soft-reduction again, two is cold
Using dynamic water allocation.Ensure suitable pulling rate, goes out the segregation of fan-shaped section strand non-stop layer, 1000 DEG C of casting blank surface temperature, cross section
45 DEG C of surface temperature difference.1525 DEG C, Casting speed 5.5m/min of molten steel temperature in tundish, goes out crystallizer slab thickness 95mm.
ESP hot rollings：By three rack roughing, electromagnetic induction heating furnace, high pressure water dephosphorization, five rack finish rolling, layer is cold and rolls up
Take the thickness that strand is rolled into customer demand.
Roughing：960 DEG C of roughing inlet temperature, 950 DEG C of roughing outlet temperature, workpiece thickness 18mm after roughing；
Sensing heating：1170 DEG C of sensing heating outlet temperature；
De-scaling：De-scaling pressure 380bar；
Finish rolling：By finish rolling reduction distribution, the hot rolling of rolling 2.5mm thickness specifications, finish rolling finishing temperature 850
℃；
Section cooling：Take air-cooled strategy；
It batches：Oiler temperature control is at 730 DEG C
Slow cooling：Batched volume it is offline after, product put burial pit carry out slow cooling outbound in 48 hours to≤200 DEG C.
The performance of the high-carbon steel of generation is as shown in table 6：
Table 6
Embodiment 7
The technological process for producing S355J0W steel completely without head ESP bar strip continuous casting and rolling flow paths in embodiment is mixed iron blast
→ slow cooling → finished product is batched in → molten iron pretreatment → BOF → LF → ESP continuous casting and rollings → section cooling →.
Converter smelting：Using 300t top and bottom combined blown converter smeltings, molten iron is subjected to decarburization, dephosphorization and desulfurization in converter,
Converter terminal controls [C] 0.13%, [Si] 0.013%, [Mn] 0.16%, [P] 0.0045%, [S] 0.0040%, tapping temperature
1660 DEG C, tapping is operated using slide plate pushing off the slag, controls quantity of slag 40mm under converter, and tapping process uses Argon, deoxidation alloying：Add
Enter aluminium ingot 240Kg, carburant, ferrosilicon, high carbon ferro-chrome, silicomangan push up 1.5 tons of slag.
LF refining：Deoxidation, desulfurization, alloying, inclusion removal, LF refining slag (FeO) 0.6%, binary are carried out in LF stoves
Basicity 8.0.Refining terminates liquid steel temperature control at 1558~1568 DEG C, and molten steel composition controls：[C] 0.49%, [Si] 0.19%,
[Mn] 0.62%, [Cr] 0.19%, [P] 0.008%, [S] 0.0025%, [N] 0.0030%.
ESP continuous castings：The strand of suitable cross-section will be cast into the molten steel of middle packet from ladle in ESP continuous castings.Submersed nozzle
Using the flat special mouth of a river, crystallizer is infundibulate, carries out wick-containing pressure in straight segmental arc, fan-shaped section dynamic soft-reduction again, two is cold
Using dynamic water allocation.Ensure suitable pulling rate, goes out the segregation of fan-shaped section strand non-stop layer, 1000 DEG C of casting blank surface temperature, cross section
45 DEG C of surface temperature difference.1525 DEG C, Casting speed 4.9m/min of molten steel temperature in tundish, goes out crystallizer slab thickness 95mm.
ESP hot rollings：By three rack roughing, electromagnetic induction heating furnace, high pressure water dephosphorization, five rack finish rolling, layer is cold and rolls up
Take the thickness that strand is rolled into customer demand.
Roughing：980 DEG C of roughing inlet temperature, 950 DEG C of roughing outlet temperature, workpiece thickness 18mm after roughing；
Sensing heating：1140 DEG C of sensing heating outlet temperature；
De-scaling：De-scaling pressure 380bar；
Finish rolling：By finish rolling reduction distribution, the hot rolling of rolling 3.0mm thickness specifications, finish rolling finishing temperature 850
℃；
Section cooling：Take air-cooled strategy；
It batches：Oiler temperature control is at 650 DEG C
Slow cooling：Batched volume it is offline after, product put burial pit carry out slow cooling outbound in 48 hours to≤200 DEG C.
The performance of the high-carbon steel of generation is as shown in table 7：
Table 7
Embodiment 8
The technological process for producing S355J0W steel completely without head ESP bar strip continuous casting and rolling flow paths in embodiment is mixed iron blast
→ slow cooling → finished product is batched in → molten iron pretreatment → BOF → LF → ESP continuous casting and rollings → section cooling →.
Converter smelting：Using 300t top and bottom combined blown converter smeltings, molten iron is subjected to decarburization, dephosphorization and desulfurization in converter,
Converter terminal controls [C] 0.14%, [Si] 0.012%, [Mn] 0.18%, [P] 0.0055%, [S] 0.0030%, tapping temperature
1640 DEG C, tapping is operated using slide plate pushing off the slag, controls quantity of slag 40mm under converter, and tapping process uses Argon, deoxidation alloying：Add
Enter aluminium ingot 240Kg, carburant, ferrosilicon, high carbon ferro-chrome, silicomangan push up 1.5 tons of slag.
LF refining：Deoxidation, desulfurization, alloying, inclusion removal, LF refining slag (FeO) 0.6%, binary are carried out in LF stoves
Basicity 8.0.Refining terminates liquid steel temperature control at 1558~1568 DEG C, and molten steel composition controls：[C] 0.48%, [Si] 0.15%,
[Mn] 0.55%, [Cr] 0.17%, [P] 0.009%, [S] 0.0015%, [N] 0.002%.
ESP continuous castings：The strand of suitable cross-section will be cast into the molten steel of middle packet from ladle in ESP continuous castings.Submersed nozzle
Using the flat special mouth of a river, crystallizer is infundibulate, carries out wick-containing pressure in straight segmental arc, fan-shaped section dynamic soft-reduction again, two is cold
Using dynamic water allocation.Ensure suitable pulling rate, goes out the segregation of fan-shaped section strand non-stop layer, 1000 DEG C of casting blank surface temperature, cross section
45 DEG C of surface temperature difference.1525 DEG C, Casting speed 5.0m/min of molten steel temperature in tundish, goes out crystallizer slab thickness 95mm.
ESP hot rollings：By three rack roughing, electromagnetic induction heating furnace, high pressure water dephosphorization, five rack finish rolling, layer is cold and rolls up
Take the thickness that strand is rolled into customer demand.
Roughing：970 DEG C of roughing inlet temperature, 950 DEG C of roughing outlet temperature, workpiece thickness 18mm after roughing；
Sensing heating：1130 DEG C of sensing heating outlet temperature；
De-scaling：De-scaling pressure 380bar；
Finish rolling：By finish rolling reduction distribution, the hot rolling of rolling 3.5mm thickness specifications, finish rolling finishing temperature 840
℃；
Section cooling：Take air-cooled strategy；
It batches：Oiler temperature control is at 700 DEG C
Slow cooling：Batched volume it is offline after, product put burial pit carry out slow cooling outbound in 48 hours to≤200 DEG C.
The performance of the high-carbon steel of generation is as shown in table 8：
Table 8
It can be ignored it should be noted that floating of the high-carbon steel of above-described embodiment generation on thickness is very small,
Yield strength and tensile strength have floating up and down for 30MPa, illustrate hereby in the present invention.
It is by the above embodiment as can be seen that provided by the invention thin based on the production of ESP bar strip continuous casting and rolling flow paths
The method of specification high-carbon steel, casting blank solidification speed is fast, as-cast structure is more uniform, Segregation of Chemical Composition is small, and strand is without soaking pit
Direct casting is realized in heating, and strand is low in operation of rolling temperature, and rolling time is short, helps to reduce plate surface decarburization, refinement
Pearlite piece interlamellar spacing, can obviously eliminate traditional process production high-carbon strip and CSP thin slab continuous rollings existing for skin decarburization,
The problems such as thickness tolerance is big and structure property is unstable.In addition, the technological process of production is short, belong to low energy consumption green manufacturing
Process regime, hot-rolled state can reach 1.5mm Ultra-thin bands, can reduce cold rolling process rolling pass, reach " with thin generation
The energy-saving purpose of thickness ".
It is described in an illustrative manner above with reference to attached drawing and is based on ESP thin slab continuous casting and rolling streams according to proposed by the present invention
The method that journey produces Thin Specs high-carbon steel.It will be understood by those skilled in the art, however, that the base proposed for aforementioned present invention
It, can also be on the basis for not departing from the content of present invention in the method that ESP bar strip continuous casting and rolling flow paths produce Thin Specs high-carbon steel
On make various improvement.Therefore, protection scope of the present invention should be determined by the content of appended claims.
Claims (6)
1. a kind of method producing Thin Specs high-carbon steel based on ESP bar strip continuous casting and rolling flow paths, which is characterized in that including molten iron
Pretreatment, converter smelting, the refining of LF stoves, ESP continuous casting and rollings, cooling, wherein
Molten iron is pre-processed by the molten iron sulphur in the molten iron being reduced to≤0.020%；
In the converter steelmaking process, decarburization, dephosphorization, desulfurization and deoxidation chemical combination are carried out to the molten iron in the converter
Gold；Wherein, the mass ratio of the ingredient of the molten steel after the converter is：C：0.08~0.15%, Si：≤ 0.03%, Mn：0.10~
0.20%, P：≤ 0.03%, S：≤ 0.06%；
In the LF stoves refining process, deoxidation, desulfurization and inclusion removal are carried out in the LF stoves；Wherein, the LF
The mass ratio of ingredient of molten steel after stove refining is：C：0.48~0.54%, Si：0.15~0.25%, Mn：0.50~
0.80%, Cr：0.16~0.20%, P：≤ 0.012%, S：≤ 0.003%, N：≤ 0.005%；
Hot-strip of the molten steel to be formed by the ESP continuous casting and rollings at different-thickness will be refined from the LF stoves；Wherein, slightly
It is 900~960 DEG C to roll outlet temperature, and the temperature of finish rolling outlet is 800~860 DEG C；
The molten steel from ladle to tundish is cast into strand in the ESP continuous castings, wherein use flat submersed nozzle, leakage
Bucket shape crystallizer, two is cold using dynamic water allocation；
Using hot-strip described in section cooling to 640~740 DEG C, batched as coiled strip steel subsequently into coiling machine, it is described at
Outbound after coiled strip steel slow cooling；
The molten steel from ladle to tundish is cast into strand in the ESP continuous castings, wherein casting blank surface temperature >=950
DEG C, the liquid steel temperature of cross section surface temperature difference≤70 DEG C, tundish is 1518~1528 DEG C, 3.5~6.0m/ of Casting speed
Min goes out crystallizer slab thickness 90mm~110mm.
2. the method for producing Thin Specs high-carbon steel based on ESP bar strip continuous casting and rolling flow paths as described in claim 1, feature
It is,
The tapping temperature of the converter is 1620~1660 DEG C, and the quantity of slag is under the converter：≤ 40mm, tapping process use Argon
Journey；Wherein,
During deoxidation alloying, the aluminium ingot of 100~300Kg is added, and carburant, ferrosilicon, high carbon ferro-chrome, silicomanganese is added and closes
Aurification.
3. the method for producing Thin Specs high-carbon steel based on ESP bar strip continuous casting and rolling flow paths as described in claim 1, feature
It is,
During the LF stoves carry out deoxidation, desulfurization and inclusion removal, LF refining slag is：≤ 1.0%, dual alkalinity
>=7.0, inclusion behavior is：≤ 2.0 grades, also, liquid steel temperature control is at 1558~1568 DEG C.
4. the method for producing Thin Specs high-carbon steel based on ESP bar strip continuous casting and rolling flow paths as described in claim 1, feature
It is,
In the ESP hot rollings of the ESP producing lines, roughing inlet temperature is 950~1050 DEG C, the temperature of sensing heating outlet
It it is 1120~1180 DEG C, workpiece thickness is 8~20mm after roughing.
5. the method for producing Thin Specs high-carbon steel based on ESP bar strip continuous casting and rolling flow paths as described in claim 1, feature
It is,
The thickness of the hot-strip is 1.5~3.5mm.
6. the method for producing Thin Specs high-carbon steel based on ESP bar strip continuous casting and rolling flow paths as described in claim 1, feature
It is,
The hot-strip slow cooling is≤200 DEG C, and temperature retention time is 48 hours.
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| CN108796189A (en) * | 2018-04-26 | 2018-11-13 | 日照钢铁控股集团有限公司 | Based on the Thin Specs RE700MC steel and preparation method thereof prepared completely without head bar strip continuous casting and rolling flow path |
| CN109013701B (en) * | 2018-07-25 | 2019-09-20 | 唐山全丰薄板有限公司 | A kind of sheet billet continuous casting and rolling production line and its production technology |
| CN110358976A (en) * | 2019-08-22 | 2019-10-22 | 江苏沙钢集团有限公司 | High-carbon steel thin strip and production method thereof |
| CN111347021B (en) * | 2020-03-31 | 2021-08-24 | 西峡县西保冶金材料有限公司 | Special continuous casting crystallizer function protection material for ESP high-carbon steel |
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| CN114734010B (en) * | 2022-03-18 | 2024-05-10 | 首钢京唐钢铁联合有限责任公司 | Production method of thin slab continuous casting and rolling online thinned casting blank |
| CN114703416B (en) * | 2022-03-31 | 2023-10-24 | 江苏沙钢集团有限公司 | 50 steel hot rolled plate and production method thereof |
| CN115896590A (en) * | 2022-09-26 | 2023-04-04 | 福建鼎盛钢铁有限公司 | Production process of medium-quality thin-specification carbon tool steel |
| CN116121657A (en) * | 2022-11-25 | 2023-05-16 | 重庆钢铁股份有限公司 | 50-excellent carbon steel strip with excellent tissue uniformity and production method thereof |
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Denomination of invention: Method for producing thin specification high carbon steel based on ESP thin slab continuous casting and rolling process Effective date of registration: 20211222 Granted publication date: 20181109 Pledgee: Rizhao Bank Co., Ltd Pledgor: RIZHAO STEEL HOLDING GROUP Co.,Ltd. Registration number: Y2021980015819 |