CN104174660B - The zerolling method of flexibility - Google Patents
The zerolling method of flexibility Download PDFInfo
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- CN104174660B CN104174660B CN201410342440.5A CN201410342440A CN104174660B CN 104174660 B CN104174660 B CN 104174660B CN 201410342440 A CN201410342440 A CN 201410342440A CN 104174660 B CN104174660 B CN 104174660B
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Abstract
The invention discloses a kind of zerolling method of flexibility, comprise the following steps: according to the different stage steel grade preset and the mapping relations of critical-temperature, determine the temperature of current steel to be rolled needed for each rolling sequence; According to the temperature needed for each rolling sequence determined, the parameter of adjustment heating furnace, roughing mill and finishing mill; After setting corresponding rolling procedure according to the yield strength of described steel, described steel are rolled successively in described heating furnace, roughing mill and finishing mill.The zerolling method of this flexibility can reduce operation of rolling energy consumption on the one hand, also can improve rolling efficiency on the other hand, reduces the production cycle.
Description
Technical field
The present invention relates to Steel Rolling Control technical field, particularly relate to a kind of zerolling method of flexibility.
Background technology
Along with the development of modern science and technology and economic construction, maximize, serialization and intensive iron and steel produce and be difficult to meet the requirement of user to the variation of steel products, personalization and high quality.In hot rolling production process, in order to make the operation of rolling stablize, need to arrange production according to certain rolling procedure.Existing hot rolling code need consider the heating-up temperature of steel grade, composition, the requirement such as strength grade and size, according to heating-up temperature from low temperature to high temperature, steel grade intensity from inferior grade to high-grade order, orderly arrangement Rolling Production.Because of part steel grade heating-up temperature and intensity higher, need to arrange a large amount of transition material, complete transition lentamente, greatly limit the flexibility of production like this, extend the rolling cycle of product, effectively can not meet the demand of client, affect completing of contract.
Along with the improvement of iron and steel enterprise's hardware device and the development of rolling mill practice, the zerolling technology of flexibility can solve above-mentioned contradiction.But existing hot rolling production technology, all refers to the flexibility of structure property in the operation of rolling.For the steel grade of same chemical composition, by the difference of roller repairing mode, realize the difference of structure property.The production of this flexibility just carries out flexibility consideration from the aspect of structure property, does not relate to the whole Rolling Production process of hot rolling, simultaneously existing because rolling temperature is higher, therefore, needs to install a large amount of transition materials, makes the production cycle long.
Summary of the invention
Main purpose of the present invention is a kind of zerolling method providing flexibility, is intended to the production whole Rolling Production process of hot rolling being carried out to flexibility, improves rolling efficiency simultaneously.
For achieving the above object, the present invention proposes a kind of zerolling method of flexibility, comprises the following steps:
According to the temperature needed for each rolling sequence determined, the parameter of adjustment heating furnace, roughing mill and finishing mill;
After setting corresponding rolling procedure according to the yield strength of described steel, described steel are rolled successively in described heating furnace, roughing mill and finishing mill.
Preferably, the mapping relations of described default different stage steel grade and critical-temperature are:
RH=Max [T (hot-short temperature), T (C solid solubility temperature), T (Mn solid solubility temperature), T (Nb solid solubility temperature), T (Ti solid solubility temperature), T (de-scaling temperature)];
RT=Max [T (check of roughing mill ability), T (temperature of nipping of roughing mill), T (FT0+ Δ T transportation temperature drop+Δ T de-scaling temperature drop)];
FT0=Max [T (FT7+ Δ T operation of rolling temperature drop), T (check of finishing mill ability), T (steel recrystallization temperature)];
FT7=Min [T (Ar3), T (NbC Precipitation Temperature), T (TiC Precipitation Temperature), T (TiN Precipitation Temperature)];
CT=T (phase transition temperature);
Wherein, RH is the tapping temperature of described heating furnace, RT is the outlet temperature of described roughing mill, FT0 is the inlet temperature of finishing mill, FT7 is the outlet temperature of described finishing mill, CT is the coiling temperature of described coiling machine, and T (Ar3) separates out ferritic critical-temperature for starting in austenite when steel cools.
Preferably, the step that the described yield strength according to steel sets corresponding rolling procedure specifically comprises:
When steel are low-intensity rank steel grade, rolling procedure is 6 ~ 8 pieces of hot rolling materials, and all the other are low-intensity rank steel grade; When steel are medium intensity level steel grade, rolling procedure is 6 ~ 8 pieces of hot rolling materials, 2 ~ 4 blocks of low-intensity rank steel grades, and all the other are medium intensity level steel grade; When steel are high intensity levels steel grade, rolling procedure is 6 ~ 8 pieces of hot rolling materials, 2 ~ 4 blocks of low-intensity rank steel grades, 4 ~ 6 blocks of medium intensity level steel grades, all the other are high intensity levels steel grade, and wherein, low-intensity rank steel grade is between yield strength 180 ~ 300Mpa level; Medium intensity level steel grade is between yield strength 300 ~ 500MPa level; High intensity rank steel grade is more than yield strength 500MPa level.
Preferably, in the operation of rolling, the rolling technological parameter of low-intensity rank steel grade is as follows: control at 130 ~ 155min at total time inside furnace of heating process, pressure-fired 10 ~ 12Pa is kept in heating furnace, the preheating section air-fuel ration control of heating furnace is 1.0 ~ 1.1, preheating time is 60 ~ 70min, the bringing-up section air-fuel ratio of heating furnace remains on 0.9 ~ 1.0, heat time is 40 ~ 50min, the soaking zone temperature air-fuel ratio of heating furnace remains on 1.0 ~ 1.1, temperature controls at 1140 ~ 1160 DEG C, and soaking time is 30 ~ 35min; In rolling process of rough rolling, de-scaling passage is more than or equal to 4, and it is 1010 ~ 1020 DEG C that roughing outlet temperature controls; The mill speed of finishing mill is 5 ~ 12m/s, and finishing temperature is 830 ~ 840 DEG C; The coiling temperature of coiling machine is 610 ~ 640 DEG C.
Preferably, in the operation of rolling, the rolling technological parameter of medium intensity level steel grade is as follows: control at 135 ~ 170min at total time inside furnace of heating process, pressure-fired 10 ~ 12Pa is kept in heating furnace, the preheating section air-fuel ratio of heating furnace remains on 1.1 ~ 1.2, preheating time is 60 ~ 70min, the bringing-up section air-fuel ratio of heating furnace remains on 0.9 ~ 1.0, heat time is 50 ~ 60min, the soaking zone temperature air-fuel ratio of heating furnace remains on 1.0 ~ 1.1, temperature controls at 1150 ~ 1180 DEG C, and soaking time is 25 ~ 40min; At rolling process of rough rolling, de-scaling passage is more than or equal to 4, and the outlet temperature of roughing mill is 1020 ~ 1030 DEG C; The mill speed of finishing mill is 5 ~ 10m/s, and finishing temperature is 840 ~ 850 DEG C; The coiling temperature of coiling machine is 610 ~ 640 DEG C.
Preferably, in the operation of rolling, the rolling technological parameter of high intensity levels steel grade is as follows: control at 160min ~ 200min at total time inside furnace of heating process, pressure-fired 10 ~ 12Pa is kept in heating furnace, the preheating section air-fuel ratio of heating furnace remains on 1.0 ~ 1.1, preheating time is 80 ~ 90min, the bringing-up section air-fuel ratio of heating furnace remains on 0.9 ~ 1.0, heat time is 50 ~ 60min, the soaking zone temperature air-fuel ratio of heating furnace remains on 1.1 ~ 1.2, temperature controls at 1170 ~ 1220 DEG C, and soaking time is 30 ~ 50min; At rolling process of rough rolling, de-scaling passage is more than or equal to 4, and the outlet temperature of roughing mill is 1030 ~ 1060 DEG C; The mill speed of finishing mill is 5 ~ 10m/s, and finishing temperature is 850 ~ 860 DEG C; The coiling temperature of coiling machine is 580 ~ 610 DEG C.
Preferably, the zerolling technology of described flexibility is further comprising the steps of:
In the laminar cooling process of steel, adopt edge-masking technology to reduce the edge temperature drop of hot-strip in cooling procedure.
Preferably, the zerolling technology of described flexibility is further comprising the steps of:
Adopt stay-warm case to reduce rough rolling process temperature drop at rough rolling process.
The zerolling method of the flexibility that the present invention proposes, according to the different stage steel grade preset and the mapping relations of critical-temperature, determine the temperature of current steel to be rolled needed for each rolling sequence, thus ensure that temperature needed for each rolling sequence is on critical-temperature, the productive prospecting of comprehensive each steel grade of hot rolling, the tissue of flexibility is produced, and the operation of rolling can be made to have larger flexibility and adaptability, make it more energy-conservation.In addition, because first determine the critical-temperature of steel needed for each rolling sequence, temperature does not need too high, and therefore, the quantity of matching used transition material can greatly reduce, and improves rhythm of production to a certain extent, shortens the production cycle.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the zerolling method preferred embodiment of flexibility of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
With reference to the schematic flow sheet that Fig. 1, Fig. 1 are the zerolling method preferred embodiment of flexibility of the present invention.
The zerolling method preferred embodiment of the flexibility that the present invention proposes.In the present embodiment, the zerolling method of flexibility comprises the following steps:
Step S10, according to the different stage steel grade preset and the mapping relations of critical-temperature, determines the temperature of current steel to be rolled needed for each rolling sequence, and wherein, the temperature needed for rolling each stage is all higher than the critical-temperature corresponding to it;
Step S20, according to the temperature needed for each rolling sequence determined, the parameter of adjustment heating furnace, roughing mill and finishing mill;
Described steel, after setting corresponding rolling procedure according to the yield strength of described steel, are rolled by step S30 successively in described heating furnace, roughing mill and finishing mill.
Particularly, for FT7, its constraints should be greater than Ar3, to guarantee that finishing stands is in the rolling of austenite one phase district; For FT0, its constraints on the one hand will guarantee that FT7 temperature can realize, and also will guarantee on the other hand within the scope that each passage temperature of finish rolling allows in mill load.Same, other temperature control point, as RT2/RT4, CT and RH etc. also have corresponding constraints.
In the present embodiment, the different stage steel grade preset and the mapping relations of critical-temperature are:
The tapping temperature RH of heating furnace is by following formulae discovery:
RH=Max [T (hot-short temperature), T (C solid solubility temperature), T (Mn solid solubility temperature), T (Nb solid solubility temperature), T (Ti solid solubility temperature), T (de-scaling temperature)];
T (hot-short temperature) is hot-short temperature corresponding to a certain steel grade, the solid solubility temperature that T (C solid solubility temperature) is C in a certain steel grade, the solid solubility temperature that T (Mn solid solubility temperature) is Mn in a certain steel grade, the solid solubility temperature that T (Nb solid solubility temperature) is Nb in a certain steel grade, the solid solubility temperature that T (Ti solid solubility temperature) is Ti in a certain steel grade, the de-scaling temperature that the steel that T (de-scaling temperature) is a certain steel grade are corresponding;
The outlet temperature RT of roughing mill is by following formulae discovery:
RT=Max [T (check of roughing mill ability), T (temperature of nipping of roughing mill), T (FT0+ Δ T transportation temperature drop+Δ T de-scaling temperature drop)];
The minimum temperature of energy rolling that T (check of roughing mill ability) is roughing mill (because steel temperature is too low, roughing mill can rolled steel), Δ T de-scaling temperature drop is the temperature drop value of steel in de-scaling process;
The inlet temperature FT0 of finishing mill is by following formulae discovery:
FT0=Max [T (FT7+ Δ T operation of rolling temperature drop), T (check of finishing mill ability), T (steel recrystallization temperature)];
The minimum temperature of energy rolling that T (check of finishing mill ability) is finishing mill (because steel temperature is too low, finishing mill can rolled steel), T (steel recrystallization temperature) is recrystallization temperature corresponding to the steel of a certain steel grade;
The outlet temperature of finishing mill is by following formulae discovery:
FT7=Min [T (Ar3), T (NbC Precipitation Temperature), T (TiC Precipitation Temperature), T (TiN Precipitation Temperature)];
T (Ar3) separates out ferritic critical-temperature for starting in austenite when steel cools, the Precipitation Temperature of NbC in the steel that T (NbC Precipitation Temperature) is a certain steel grade, the Precipitation Temperature of TiC in the steel that T (TiC Precipitation Temperature) is a certain steel grade, the Precipitation Temperature of TiN in the steel that T (TiN Precipitation Temperature) is a certain steel grade;
The coiling temperature CT of coiling machine is by following formulae discovery:
CT=T (phase transition temperature);
The phase transition temperature of the steel of T (phase transition temperature) a certain steel grade.
After the outlet temperature of roughing mill is determined, can according to the inlet temperature of outlet temperature relative set roughing mill again.Determine that a certain steel grade is after the critical-temperature in each stage of rolling, as long as ensure that rolling temperature is a little more than critical-temperature, generally gets 20 ~ 30 DEG C.Now, be both conducive to energy-conservation (Yin Wendu is lower, and the power of each equipment is lower), also assures that the mechanical property of steel grade and the rolling condition (the too low meeting of Yin Wendu is unfavorable for equipment rolling) of each equipment simultaneously.
Particularly, set corresponding rolling procedure according to the yield strength of steel in step S30 and specifically adopt with the following method: when steel are low-intensity rank steel grade, rolling procedure is 6 ~ 8 pieces of hot rolling materials, and all the other are low-intensity rank steel grade; When steel are medium intensity level steel grade, rolling procedure is 6 ~ 8 pieces of hot rolling materials, 2 ~ 4 blocks of low-intensity rank steel grades, and all the other are medium intensity level steel grade; When steel are high intensity levels steel grade, rolling procedure is 6 ~ 8 pieces of hot rolling materials, 2 ~ 4 blocks of low-intensity rank steel grades, 4 ~ 6 blocks of medium intensity level steel grades, all the other are high intensity levels steel grade, and wherein, low-intensity rank steel grade is between yield strength 180 ~ 300Mpa level; Medium intensity level steel grade is between yield strength 300 ~ 500MPa level; High intensity rank steel grade is more than yield strength 500MPa level.
Particularly, three kinds of rolling technological parameters that three kinds of steel are respectively low-intensity rank steel grade, medium intensity level steel grade and high intensity levels steel grade are provided in the present embodiment.
In the operation of rolling, the rolling technological parameter of low-intensity rank steel grade is as follows: control at 130 ~ 155min at total time inside furnace of heating process, pressure-fired 10 ~ 12Pa is kept in heating furnace, the preheating section air-fuel ration control of heating furnace is 1.0 ~ 1.1, preheating time is 60 ~ 70min, the bringing-up section air-fuel ratio of heating furnace remains on 0.9 ~ 1.0, heat time is 40 ~ 50min, the soaking zone temperature air-fuel ratio of heating furnace remains on 1.0 ~ 1.1, temperature controls at 1140 ~ 1160 DEG C, and soaking time is 30 ~ 35min; In rolling process of rough rolling, de-scaling passage is more than or equal to 4, and it is 1010 ~ 1020 DEG C that roughing outlet temperature controls; The mill speed of finishing mill is 5 ~ 12m/s, and finishing temperature is 830 ~ 840 DEG C; The coiling temperature of coiling machine is 610 ~ 640 DEG C.
And existing equal low-intensity rank steel grade, because each phase temperature of rolling is higher, rolling conventional in prior art needs 8 ~ 10 pieces of boiling hot rollers.
In the operation of rolling, the rolling technological parameter of medium intensity level steel grade is as follows: control at 135 ~ 170min at total time inside furnace of heating process, pressure-fired 10 ~ 12Pa is kept in heating furnace, the preheating section air-fuel ratio of heating furnace remains on 1.1 ~ 1.2, preheating time is 60 ~ 70min, the bringing-up section air-fuel ratio of heating furnace remains on 0.9 ~ 1.0, heat time is 50 ~ 60min, the soaking zone temperature air-fuel ratio of heating furnace remains on 1.0 ~ 1.1, temperature controls at 1150 ~ 1180 DEG C, and soaking time is 25 ~ 40min; At rolling process of rough rolling, de-scaling passage is more than or equal to 4, and the outlet temperature of roughing mill is 1020 ~ 1030 DEG C; The mill speed of finishing mill is 5 ~ 10m/s, and finishing temperature is 840 ~ 850 DEG C; The coiling temperature of coiling machine is 610 ~ 640 DEG C.
Under similarity condition, because each phase temperature of rolling is higher, pair rolling in prior art, is adopted to need 8 ~ 10 pieces of boiling hot rollers to add 4 ~ 8 blocks of low-intensity rank steel grades
In the operation of rolling, the rolling technological parameter of high intensity levels steel grade is as follows: control at 160min ~ 200min at total time inside furnace of heating process, pressure-fired 10 ~ 12Pa is kept in heating furnace, the preheating section air-fuel ratio of heating furnace remains on 1.0 ~ 1.1, preheating time is 80 ~ 90min, the bringing-up section air-fuel ratio of heating furnace remains on 0.9 ~ 1.0, heat time is 50 ~ 60min, the soaking zone temperature air-fuel ratio of heating furnace remains on 1.1 ~ 1.2, temperature controls at 1170 ~ 1220 DEG C, and soaking time is 30 ~ 50min; At rolling process of rough rolling, de-scaling passage is more than or equal to 4, and the outlet temperature of roughing mill is 1030 ~ 1060 DEG C; The mill speed of finishing mill is 5 ~ 10m/s, and finishing temperature is 850 ~ 860 DEG C; The coiling temperature of coiling machine is 580 ~ 610 DEG C.
Under similarity condition, because each phase temperature of rolling is higher, in prior art, adopt pair rolling 8 ~ 10 pieces of boiling hot rollers, 4 ~ 8 pieces of boiling hot rollers and 6 ~ 10 blocks of medium intensity level steel grades.
Further, the zerolling method of the flexibility of the present invention's proposition is further comprising the steps of:
In the laminar cooling process of steel, adopt edge-masking technology to reduce the edge temperature drop of hot-strip in cooling procedure.
Further, the zerolling method of the flexibility of the present invention's proposition is further comprising the steps of:
Adopt stay-warm case to reduce rough rolling process temperature drop at rough rolling process.
Now, the zerolling method of this flexibility can be made can to reduce Rolling Production energy consumption further.
Particularly, in the present embodiment, three kinds of slabs are adopted to be rolled the zerolling method that this flexibility is better described.
Shown in the concrete composition of three kinds of slabs sees the following form:
The smelting composition of table 1 three kinds of slabs
Table 2 operation of rolling temperature
| Operation of rolling temperature, DEG C | RH | RT2/RT4 | FT0 | FT7 | CT |
| Slab 1 | 1160 | 1020 | 1010 | 835 | 640 |
| Slab 2 | 1180 | 1030 | 1023 | 840 | 613 |
| Slab 3 | 1210 | 1040 | 1035 | 856 | 580 |
Slab 1 is low-intensity rank steel grade, and rolling procedure is: first arrange 8 pieces of hot rolling materials in heating furnace, can arrange its Rolling Production.Corresponding rolling technological parameter adjustment is as follows: slab 1 controls at 130min at total time inside furnace of heating process.Keep pressure-fired 12Pa in stove, prevent from sucking cold wind, preheating section air-fuel ratio remains on 1.0, preheating time 60min, bringing-up section air-fuel ratio remains on 0.95, heat time 40min, soaking zone temperature air-fuel ratio remains on 1.0, and temperature controls at 1160 DEG C, soaking time 30min.Optimize rolling pattern and de-scaling passage at rolling process of rough rolling, ensure de-scaling passage >=4, and adopt stay-warm case to reduce rough rolling process temperature drop, roughing outlet temperature is 1020 DEG C.Finish rolling entrance substantially remains unchanged or slightly reduces in original temperature schedule, promote finish rolling mill speed, ensure finishing temperature and coiling temperature constant on original conventional hot rolling technology, mill speed 12m/s, finishing temperature 835 DEG C, coiling temperature 640 DEG C, adopts edge-masking technology at laminar cooling process, reduces the edge temperature drop of hot-strip in cooling procedure.
Slab 2 is medium intensity level steel grade, and rolling procedure is: first arrange 8 pieces of hot rolling materials in heating furnace, then after arranging 2 blocks of too low intensity rank steel grades, can arrange its Rolling Production.Corresponding rolling technological parameter adjustment is as follows: control at 150min at total time inside furnace of heating process.Keep pressure-fired 12Pa in stove, prevent from sucking cold wind, preheating section air-fuel ratio remains on 1.1, preheating time 60min, bringing-up section air-fuel ratio remains on 1.0, heat time 50min, soaking zone temperature air-fuel ratio remains on 1.1, and temperature controls at 1180 DEG C, soaking time 40min.Optimize rolling pattern and de-scaling passage at rolling process of rough rolling, ensure de-scaling passage >=4, and adopt stay-warm case to reduce rough rolling process temperature drop, roughing outlet temperature is 1030 DEG C.Finish rolling entrance substantially remains unchanged or slightly reduces in original temperature schedule, promote finish rolling mill speed, ensure finishing temperature and coiling temperature constant on original conventional hot rolling technology, mill speed 10m/s, finishing temperature 840 DEG C, coiling temperature 613 DEG C, adopts edge-masking technology at laminar cooling process, reduces the edge temperature drop of hot-strip in cooling procedure.
Slab 3 is high intensity levels steel grade, and rolling procedure is: first arrange 8 pieces of hot rolling materials in heating furnace, arranges 2 blocks of low-intensity rank steel grades, then arranges 4 blocks of medium intensity level steel grades, can arrange its Rolling Production.Corresponding rolling technological parameter adjustment is as follows: slab 3 is at total time inside furnace 180min of heating process.Keep pressure-fired 12Pa in stove, preheating section air-fuel ratio remains on 1.1, preheating time 80min, bringing-up section air-fuel ratio remains on 1.05, heat time 70min, and soaking zone temperature air-fuel ratio remains on 1.15, and soaking temperature controls at 1210 DEG C, heat time 30min.Three quarter continuous rolling mill rolling is taked, R1 de-scaling 1 road, R2 rolling 5 passage in roughing rolling, de-scaling 2 road, R3 de-scaling 1 road, R4 not de-scaling, total de-scaling passage is 4 passages, adopt stay-warm case to reduce rough rolling process temperature drop, RT4 roughing outlet temperature is 1040 DEG C, and mill speed is 7.6m/s, finishing temperature 856 DEG C, coiling temperature 580 DEG C, adopts edge-masking technology at laminar cooling process, reduces the edge temperature drop of hot-strip in cooling procedure.
After rolling completes, the hot-rolled sheet coil mechanical property contrast that 3 pieces of slab rollings go out is in table 3.
Table 3 is organized, mechanical property contrast
As can be seen from Table 3, as long as ensure that the rolling temperature in each stage is more than corresponding critical-temperature, the coil of strip microstructure and mechanical property that 3 pieces of slab rollings go out all meets standard-required.
The zerolling method of the flexibility that the present invention proposes, according to the different stage steel grade preset and the mapping relations of critical-temperature, determine the temperature of current steel to be rolled needed for each rolling sequence, thus ensure that temperature needed for each rolling sequence is on critical-temperature, the zerolling method of this flexibility can reduce operation of rolling energy consumption on the one hand, also can improve rolling efficiency on the other hand.The productive prospecting of comprehensive each steel grade of hot rolling of zerolling method of this flexibility, the tissue of flexibility is produced, and the operation of rolling can be made to have larger flexibility and adaptability, reduce Rolling Production energy consumption.In addition, because first determine the critical-temperature of steel needed for each rolling sequence, temperature does not need too high, therefore, the quantity of matching used transition material can greatly reduce, and improves rhythm of production to a certain extent, shorten the production cycle, thus improve rolling efficiency.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure transformation utilizing description of the present invention and accompanying drawing content to do, or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. a zerolling method for flexibility, is characterized in that, comprise the following steps:
According to the different stage steel grade preset and the mapping relations of critical-temperature, determine the temperature of current steel to be rolled needed for each rolling sequence, wherein, the temperature needed for rolling each stage is all higher than the critical-temperature corresponding to it;
According to the temperature needed for each rolling sequence determined, the parameter of adjustment heating furnace, roughing mill and finishing mill;
After setting corresponding rolling procedure according to the yield strength of described steel, described steel are rolled successively in described heating furnace, roughing mill and finishing mill;
Wherein, the step that the described yield strength according to steel sets corresponding rolling procedure specifically comprises:
When steel are low-intensity rank steel grade, rolling procedure is 6 ~ 8 pieces of hot rolling materials, and all the other are low-intensity rank steel grade; When steel are medium intensity level steel grade, rolling procedure is 6 ~ 8 pieces of hot rolling materials, 2 ~ 4 blocks of low-intensity rank steel grades, and all the other are medium intensity level steel grade; When steel are high intensity levels steel grade, rolling procedure is 6 ~ 8 pieces of hot rolling materials, 2 ~ 4 blocks of low-intensity rank steel grades, 4 ~ 6 blocks of medium intensity level steel grades, all the other are high intensity levels steel grade, and wherein, low-intensity rank steel grade is between yield strength 180 ~ 300Mpa level; Medium intensity level steel grade is between yield strength 300 ~ 500MPa level; High intensity rank steel grade is more than yield strength 500MPa level.
2. zerolling method as claimed in claim 1, it is characterized in that, the mapping relations of described default different stage steel grade and critical-temperature are:
RH=Max [T (hot-short temperature), T (C solid solubility temperature), T (Mn solid solubility temperature), T (Nb solid solubility temperature), T (Ti solid solubility temperature), T (de-scaling temperature)];
RT=Max [T (check of roughing mill ability), T (temperature of nipping of roughing mill), T (FT0+ Δ T transportation temperature drop+Δ T de-scaling temperature drop)];
FT0=Max [T (FT7+ Δ T operation of rolling temperature drop), T (check of finishing mill ability), T (steel recrystallization temperature)];
FT7=Min [T (Ar3), T (NbC Precipitation Temperature), T (TiC Precipitation Temperature), T (TiN Precipitation Temperature)];
CT=T (phase transition temperature);
Wherein, RH is the tapping temperature of described heating furnace, RT is the outlet temperature of described roughing mill, FT0 is the inlet temperature of finishing mill, FT7 is the outlet temperature of described finishing mill, CT is the coiling temperature of coiling machine, and T (Ar3) separates out ferritic critical-temperature for starting in austenite when steel cools.
3. zerolling method as claimed in claim 1, it is characterized in that, in the operation of rolling, the rolling technological parameter of low-intensity rank steel grade is as follows: control at 130 ~ 155min at total time inside furnace of heating process, pressure-fired 10 ~ 12Pa is kept in heating furnace, the preheating section air-fuel ration control of heating furnace is 1.0 ~ 1.1, preheating time is 60 ~ 70min, the bringing-up section air-fuel ratio of heating furnace remains on 0.9 ~ 1.0, heat time is 40 ~ 50min, the soaking zone temperature air-fuel ratio of heating furnace remains on 1.0 ~ 1.1, temperature controls at 1140 ~ 1160 DEG C, soaking time is 30 ~ 35min, in rolling process of rough rolling, de-scaling passage is more than or equal to 4, and it is 1010 ~ 1020 DEG C that roughing outlet temperature controls, the mill speed of finishing mill is 5 ~ 12m/s, and finishing temperature is 830 ~ 840 DEG C, the coiling temperature of coiling machine is 610 ~ 640 DEG C.
4. zerolling method according to claim 1, it is characterized in that, in the operation of rolling, the rolling technological parameter of medium intensity level steel grade is as follows: control at 135 ~ 170min at total time inside furnace of heating process, pressure-fired 10 ~ 12Pa is kept in heating furnace, the preheating section air-fuel ratio of heating furnace remains on 1.1 ~ 1.2, preheating time is 60 ~ 70min, the bringing-up section air-fuel ratio of heating furnace remains on 0.9 ~ 1.0, heat time is 50 ~ 60min, the soaking zone temperature air-fuel ratio of heating furnace remains on 1.0 ~ 1.1, temperature controls at 1150 ~ 1180 DEG C, soaking time is 25 ~ 40min, at rolling process of rough rolling, de-scaling passage is more than or equal to 4, and the outlet temperature of roughing mill is 1020 ~ 1030 DEG C, the mill speed of finishing mill is 5 ~ 10m/s, and finishing temperature is 840 ~ 850 DEG C, the coiling temperature of coiling machine is 610 ~ 640 DEG C.
5. zerolling method according to claim 1, it is characterized in that, in the operation of rolling, the rolling technological parameter of high intensity levels steel grade is as follows: control at 160min ~ 200min at total time inside furnace of heating process, pressure-fired 10 ~ 12Pa is kept in heating furnace, the preheating section air-fuel ratio of heating furnace remains on 1.0 ~ 1.1, preheating time is 80 ~ 90min, the bringing-up section air-fuel ratio of heating furnace remains on 0.9 ~ 1.0, heat time is 50 ~ 60min, the soaking zone temperature air-fuel ratio of heating furnace remains on 1.1 ~ 1.2, temperature controls at 1170 ~ 1220 DEG C, soaking time is 30 ~ 50min, at rolling process of rough rolling, de-scaling passage is more than or equal to 4, and the outlet temperature of roughing mill is 1030 ~ 1060 DEG C, the mill speed of finishing mill is 5 ~ 10m/s, and finishing temperature is 850 ~ 860 DEG C, the coiling temperature of coiling machine is 580 ~ 610 DEG C.
6. according to the zerolling method in claim 3 to 5 described in any one, further comprising the steps of:
In the laminar cooling process of steel, adopt edge-masking technology to reduce the edge temperature drop of hot-strip in cooling procedure.
7. according to the zerolling method in claim 3 to 5 described in any one, further comprising the steps of:
Adopt stay-warm case to reduce rough rolling process temperature drop at rough rolling process.
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| CN109590339B (en) * | 2018-12-06 | 2020-09-01 | 武汉钢铁有限公司 | Hot-rolled edge quality control method of low-temperature high-magnetic-induction oriented silicon steel |
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