CN104174660A - Flexible low-temperature rolling method - Google Patents
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- CN104174660A CN104174660A CN201410342440.5A CN201410342440A CN104174660A CN 104174660 A CN104174660 A CN 104174660A CN 201410342440 A CN201410342440 A CN 201410342440A CN 104174660 A CN104174660 A CN 104174660A
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Abstract
The invention discloses a flexible low-temperature rolling method which comprises the following steps: the temperature required by current to-be-rolled steel in each rolling stage is determined according to the preset mapping relations between different steel grades and critical temperatures; parameters of a heating furnace, a rough mill and a finishing mill are adjusted according to the determined temperature required in each rolling stage; and the steel is rolled by the heating furnace, the rough mill and the finishing mill sequentially after corresponding rolling schedule is set according to the yield strength of the steel. The flexible low-temperature rolling method can reduce energy consumption in a rolling process, improve the rolling efficiency and shorten the production cycle.
Description
Technical field
The present invention relates to Steel Rolling Control technical field, relate in particular to a kind of zerolling method of flexibility.
Background technology
Along with the development of modern science and technology and economic construction, maximization, serialization and intensive iron and steel are produced and are 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 stable, need to arrange production according to certain rolling procedure.Existing hot rolling rules need be considered the requirements such as heating-up temperature, composition, strength grade and size of steel grade, according to heating-up temperature from low temperature to high temperature, steel grade intensity is 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 materials, complete lentamente transition, so greatly limited the flexibility of producing, extended the rolling cycle of product, can not effectively not meet client's demand, 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 rolling the difference of the rear type of cooling, realize the difference of structure property.The production of this flexibility is just carried out flexibility consideration from the aspect of structure property, does not relate to the whole Rolling Production process of hot rolling, simultaneously existing higher because of rolling temperature, therefore, a large amount of transition materials need to be installed, and makes the production cycle long.
Summary of the invention
Main purpose of the present invention is to provide a kind of zerolling method of flexibility, is intended to the whole Rolling Production process of hot rolling to carry out the production of 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 required temperature of each rolling sequence of determining, adjust the parameter of heating furnace, roughing mill and finishing mill;
Setting after 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) starts to separate out ferritic critical-temperature in austenite when cooling for steel.
Preferably, the step that the described yield strength according to steel is set corresponding rolling procedure specifically comprises:
When steel are low-intensity rank steel grade, rolling procedure is 6～8 hot rolling materials, and all the other are low-intensity rank steel grade; When steel are moderate strength rank steel grade, rolling procedure is 6～8 hot rolling materials, 2～4 blocks of low-intensity rank steel grades, and all the other are moderate strength rank steel grade; When steel are high intensity levels steel grade, rolling procedure is 6～8 hot rolling materials, 2～4 blocks of low-intensity rank steel grades, 4～6 blocks of moderate strength rank 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; Moderate strength rank 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: the total time inside furnace in heating process is controlled at 130～155min, in heating furnace, keep pressure-fired 10～12Pa, the preheating section air-fuel ratio of heating furnace is controlled at 1.0～1.1, be 60～70min preheating time, 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 is controlled at 1140～1160 ℃, 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 ℃ that roughing outlet temperature is controlled; The mill speed of finishing mill is 5～12m/s, and finishing temperature is 830～840 ℃; The coiling temperature of coiling machine is 610～640 ℃.
Preferably, in the operation of rolling, the rolling technological parameter of moderate strength rank steel grade is as follows: the total time inside furnace in heating process is controlled at 135～170min, in heating furnace, keep pressure-fired 10～12Pa, the preheating section air-fuel ratio of heating furnace remains on 1.1～1.2, be 60～70min preheating time, 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 is controlled at 1150～1180 ℃, 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 ℃; The mill speed of finishing mill is 5～10m/s, and finishing temperature is 840～850 ℃; The coiling temperature of coiling machine is 610～640 ℃.
Preferably, in the operation of rolling, the rolling technological parameter of high intensity levels steel grade is as follows: the total time inside furnace in heating process is controlled at 160min～200min, in heating furnace, keep pressure-fired 10～12Pa, the preheating section air-fuel ratio of heating furnace remains on 1.0～1.1, be 80～90min preheating time, 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 is controlled at 1170～1220 ℃, 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 ℃; The mill speed of finishing mill is 5～10m/s, and finishing temperature is 850～860 ℃; The coiling temperature of coiling machine is 580～610 ℃.
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 hot-strip at the limit of cooling procedure portion temperature drop.
Preferably, the zerolling technology of described flexibility is further comprising the steps of:
At rough rolling process, adopt stay-warm case to reduce rough rolling process temperature drop.
The zerolling method of the flexibility that the present invention proposes, according to default different stage steel grade and the mapping relations of critical-temperature, determine and currently treat that rolled steel is in the required temperature of each rolling sequence, thereby guarantee in the required temperature of each rolling sequence on critical-temperature, the production feature of comprehensive each steel grade of hot rolling, the tissue of flexibility is produced, and can make the operation of rolling have larger flexibility and adaptability, makes it more energy-conservation.In addition, because first determine steel in the required critical-temperature of each rolling sequence, temperature does not need too high, and therefore, the quantity of matching used transition material can greatly reduce, and improves to a certain extent rhythm of production, has shortened 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, in connection with embodiment, are described further with reference to accompanying drawing.
The specific embodiment
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
With reference to Fig. 1, the schematic flow sheet of the zerolling method preferred embodiment that Fig. 1 is 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 default different stage steel grade and the mapping relations of critical-temperature, determines and currently treats that rolled steel is in the required temperature of each rolling sequence, and wherein, required temperature of each stage of rolling is all higher than its corresponding critical-temperature;
Step S20, according to the required temperature of each rolling sequence of determining, adjusts the parameter of heating furnace, roughing mill and finishing mill;
Step S30 setting after corresponding rolling procedure according to the yield strength of described steel, is rolled described steel 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 is will guarantee that FT7 temperature can realize on the one hand, also will guarantee that on the other hand each passage temperature of finish rolling is within the scope of mill load permission.Same, other temperature control point, as RT2/RT4, CT and RH etc. also have corresponding constraints.
In the present embodiment, default different stage steel grade and the mapping relations of critical-temperature are:
The tapping temperature RH of heating furnace calculates by following formula:
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 the hot-short temperature that a certain steel grade is corresponding, T (C solid solubility temperature) is the solid solubility temperature of C in a certain steel grade, T (Mn solid solubility temperature) is the solid solubility temperature of Mn in a certain steel grade, T (Nb solid solubility temperature) is the solid solubility temperature of Nb in a certain steel grade, T (Ti solid solubility temperature) is the solid solubility temperature of Ti in a certain steel grade, and T (de-scaling temperature) is the de-scaling temperature corresponding to steel of a certain steel grade;
The outlet temperature RT of roughing mill calculates by following formula:
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 (too low because of steel temperature, 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 calculates by following formula:
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 (too low because of steel temperature, finishing mill can rolled steel), T (steel recrystallization temperature) is the recrystallization temperature corresponding to steel of a certain steel grade;
The outlet temperature of finishing mill is calculated by following formula:
FT7=Min[T (Ar3), T (NbC Precipitation Temperature), T (TiC Precipitation Temperature), T (TiN Precipitation Temperature)];
T (Ar3) starts to separate out ferritic critical-temperature in austenite when cooling for steel, T (NbC Precipitation Temperature) is the Precipitation Temperature of NbC in the steel of a certain steel grade, T (TiC Precipitation Temperature) is the Precipitation Temperature of TiC in the steel of a certain steel grade, and T (TiN Precipitation Temperature) is the Precipitation Temperature of TiN in the steel of a certain steel grade;
The coiling temperature CT of coiling machine calculates by following formula:
CT=T (phase transition temperature);
The phase transition temperature of the steel of a certain steel grade of T (phase transition temperature).
After the outlet temperature of roughing mill is determined, can be according to the outlet temperature inlet temperature of relative set roughing mill again.Determine a certain steel grade after the critical-temperature in each stage of rolling, as long as assurance rolling temperature is a little more than critical-temperature, generally get 20～30 ℃.Now, be both conducive to energy-conservation (Yin Wendu is lower, and the power of each equipment is lower), also guaranteed the mechanical property of steel grade and the rolling condition of each equipment (the too low meeting of Yin Wendu is unfavorable for equipment rolling) simultaneously.
Particularly, in step S30, according to the yield strength of steel, set corresponding rolling procedure and specifically adopt with the following method: when steel are low-intensity rank steel grade, rolling procedure is 6～8 hot rolling materials, and all the other are low-intensity rank steel grade; When steel are moderate strength rank steel grade, rolling procedure is 6～8 hot rolling materials, 2～4 blocks of low-intensity rank steel grades, and all the other are moderate strength rank steel grade; When steel are high intensity levels steel grade, rolling procedure is 6～8 hot rolling materials, 2～4 blocks of low-intensity rank steel grades, 4～6 blocks of moderate strength rank 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; Moderate strength rank steel grade is between yield strength 300～500MPa level; High intensity rank steel grade is more than yield strength 500MPa level.
Particularly, in the present embodiment, provide three kinds of rolling technological parameters that three kinds of steel are respectively low-intensity rank steel grade, moderate strength rank steel grade and high intensity levels steel grade.
In the operation of rolling, the rolling technological parameter of low-intensity rank steel grade is as follows: the total time inside furnace in heating process is controlled at 130～155min, in heating furnace, keep pressure-fired 10～12Pa, the preheating section air-fuel ratio of heating furnace is controlled at 1.0～1.1, be 60～70min preheating time, 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 is controlled at 1140～1160 ℃, 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 ℃ that roughing outlet temperature is controlled; The mill speed of finishing mill is 5～12m/s, and finishing temperature is 830～840 ℃; The coiling temperature of coiling machine is 610～640 ℃.
And existing equal low-intensity rank steel grade, because each phase temperature of rolling is higher, rolling conventional in prior art needs 8～10 boiling hot rollers.
In the operation of rolling, the rolling technological parameter of moderate strength rank steel grade is as follows: the total time inside furnace in heating process is controlled at 135～170min, in heating furnace, keep pressure-fired 10～12Pa, the preheating section air-fuel ratio of heating furnace remains on 1.1～1.2, be 60～70min preheating time, 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 is controlled at 1150～1180 ℃, 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 ℃; The mill speed of finishing mill is 5～10m/s, and finishing temperature is 840～850 ℃; The coiling temperature of coiling machine is 610～640 ℃.
Under similarity condition, because each phase temperature of rolling is higher, available technology adopting pair rolling needs 8～10 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: the total time inside furnace in heating process is controlled at 160min～200min, in heating furnace, keep pressure-fired 10～12Pa, the preheating section air-fuel ratio of heating furnace remains on 1.0～1.1, be 80～90min preheating time, 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 is controlled at 1170～1220 ℃, 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 ℃; The mill speed of finishing mill is 5～10m/s, and finishing temperature is 850～860 ℃; The coiling temperature of coiling machine is 580～610 ℃.
Under similarity condition, because each phase temperature of rolling is higher, 8～10 boiling hot rollers of available technology adopting pair rolling, 4～8 boiling hot rollers and 6～10 blocks of moderate strength rank steel grades.
The zerolling method of the flexibility that further, the present invention proposes is further comprising the steps of:
In the laminar cooling process of steel, adopt edge-masking technology to reduce hot-strip at the limit of cooling procedure portion temperature drop.
The zerolling method of the flexibility that further, the present invention proposes is further comprising the steps of:
At rough rolling process, adopt stay-warm case to reduce rough rolling process temperature drop.
Now, can make the zerolling method of this flexibility can further reduce Rolling Production energy consumption.
Particularly, in the present embodiment, adopt three kinds of slabs to be rolled better to illustrate the zerolling method of this flexibility.
Shown in the concrete composition of three kinds of slabs sees the following form:
The smelting composition of three kinds of slabs of table 1
Table 2 operation of rolling temperature
| Operation of rolling temperature, ℃ | 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: in heating furnace, first arrange 8 hot rolling materials, can arrange its Rolling Production.Corresponding rolling technological parameter adjustment is as follows: slab 1 is controlled at 130min at total time inside furnace of heating process.In stove, keep pressure-fired 12Pa, 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 is controlled at 1160 ℃, soaking time 30min.At rolling process of rough rolling, optimize rolling pattern and de-scaling passage, guarantee de-scaling passage >=4, and adopt stay-warm case to reduce rough rolling process temperature drop, roughing outlet temperature is 1020 ℃.Finish rolling entrance substantially remains unchanged or slightly reduces in original temperature schedule, promote finish rolling mill speed, guarantee that finishing temperature and coiling temperature are constant on original conventional hot rolling technology, mill speed 12m/s, 835 ℃ of finishing temperatures, 640 ℃ of coiling temperatures, adopt edge-masking technology at laminar cooling process, reduce hot-strip at the limit of cooling procedure portion temperature drop.
Slab 2 is moderate strength rank steel grade, and rolling procedure is: in heating furnace, first arrange 8 hot rolling materials, then arrange, after 2 blocks of too low intensity rank steel grades, can arrange its Rolling Production.Corresponding rolling technological parameter adjustment is as follows: the total time inside furnace in heating process is controlled at 150min.In stove, keep pressure-fired 12Pa, 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 is controlled at 1180 ℃, soaking time 40min.At rolling process of rough rolling, optimize rolling pattern and de-scaling passage, guarantee de-scaling passage >=4, and adopt stay-warm case to reduce rough rolling process temperature drop, roughing outlet temperature is 1030 ℃.Finish rolling entrance substantially remains unchanged or slightly reduces in original temperature schedule, promote finish rolling mill speed, guarantee that finishing temperature and coiling temperature are constant on original conventional hot rolling technology, mill speed 10m/s, 840 ℃ of finishing temperatures, 613 ℃ of coiling temperatures, adopt edge-masking technology at laminar cooling process, reduce hot-strip at the limit of cooling procedure portion temperature drop.
Slab 3 is high intensity levels steel grade, and rolling procedure is: in heating furnace, first arrange 8 hot rolling materials, arrange 2 blocks of low-intensity rank steel grades, then arrange 4 blocks of moderate strength rank 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, soaking zone temperature air-fuel ratio remains on 1.15, soaking temperature is controlled at 1210 ℃, heat time 30min.In roughing rolling, take three quarter continuous rolling mill rolling, R1 de-scaling 1 road, R2 rolling 5 passages, de-scaling 2 roads, R3 de-scaling 1 road, not de-scaling of R4, total de-scaling passage is 4 passages, adopt stay-warm case to reduce rough rolling process temperature drop, RT4 roughing outlet temperature is 1040 ℃, and mill speed is 7.6m/s, 856 ℃ of finishing temperatures, 580 ℃ of coiling temperatures, adopt edge-masking technology at laminar cooling process, reduce hot-strip at the limit of cooling procedure portion temperature drop.
After rolling completes, the hot-rolled sheet coil mechanical property contrast that 3 slab rollings go out is in Table 3.
Table 3 tissue, mechanical property contrast
As can be seen from Table 3, as long as the rolling temperature that guarantees each stage is more than corresponding critical-temperature, coil of strip tissue and mechanical property that 3 slab rollings go out all meet standard-required.
The zerolling method of the flexibility that the present invention proposes, according to default different stage steel grade and the mapping relations of critical-temperature, determine and currently treat that rolled steel is in the required temperature of each rolling sequence, thereby guarantee in the required temperature of each rolling sequence 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 production feature of each steel grade of zerolling method synthesis hot rolling of this flexibility, the tissue of flexibility is produced, and can make the operation of rolling have larger flexibility and adaptability, has reduced Rolling Production energy consumption.In addition, because first determine steel in the required critical-temperature of each rolling sequence, temperature does not need too high, therefore, the quantity of matching used transition material can greatly reduce, and improves to a certain extent rhythm of production, shorten the production cycle, thereby improved rolling efficiency.
These are only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure transformation that utilizes 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 (8)
1. a zerolling method for flexibility, is characterized in that, comprises the following steps:
According to default different stage steel grade and the mapping relations of critical-temperature, determine and currently treat that rolled steel is in the required temperature of each rolling sequence, wherein, required temperature of each stage of rolling is all higher than its corresponding critical-temperature;
According to the required temperature of each rolling sequence of determining, adjust the parameter of heating furnace, roughing mill and finishing mill;
Setting after 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.
2. zerolling method as claimed in claim 1, 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 described coiling machine, and T (Ar3) starts to separate out ferritic critical-temperature in austenite when cooling for steel.
3. zerolling method as claimed in claim 1, is characterized in that, the step that the described yield strength according to steel is set corresponding rolling procedure specifically comprises:
When steel are low-intensity rank steel grade, rolling procedure is 6～8 hot rolling materials, and all the other are low-intensity rank steel grade; When steel are moderate strength rank steel grade, rolling procedure is 6～8 hot rolling materials, 2～4 blocks of low-intensity rank steel grades, and all the other are moderate strength rank steel grade; When steel are high intensity levels steel grade, rolling procedure is 6～8 hot rolling materials, 2～4 blocks of low-intensity rank steel grades, 4～6 blocks of moderate strength rank 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; Moderate strength rank steel grade is between yield strength 300～500MPa level; High intensity rank steel grade is more than yield strength 500MPa level.
4. zerolling method as claimed in claim 3, it is characterized in that, in the operation of rolling, the rolling technological parameter of low-intensity rank steel grade is as follows: the total time inside furnace in heating process is controlled at 130～155min, in heating furnace, keep pressure-fired 10～12Pa, the preheating section air-fuel ratio of heating furnace is controlled at 1.0～1.1, be 60～70min preheating time, 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 is controlled at 1140～1160 ℃, 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 ℃ that roughing outlet temperature is controlled, the mill speed of finishing mill is 5～12m/s, and finishing temperature is 830～840 ℃, the coiling temperature of coiling machine is 610～640 ℃.
5. a kind of zerolling technology of flexibility according to claim 3, it is characterized in that, in the operation of rolling, the rolling technological parameter of moderate strength rank steel grade is as follows: the total time inside furnace in heating process is controlled at 135～170min, in heating furnace, keep pressure-fired 10～12Pa, the preheating section air-fuel ratio of heating furnace remains on 1.1～1.2, be 60～70min preheating time, 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 is controlled at 1150～1180 ℃, 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 ℃, the mill speed of finishing mill is 5～10m/s, and finishing temperature is 840～850 ℃, the coiling temperature of coiling machine is 610～640 ℃.
6. a kind of zerolling technology of flexibility according to claim 3, it is characterized in that, in the operation of rolling, the rolling technological parameter of high intensity levels steel grade is as follows: the total time inside furnace in heating process is controlled at 160min～200min, in heating furnace, keep pressure-fired 10～12Pa, the preheating section air-fuel ratio of heating furnace remains on 1.0～1.1, be 80～90min preheating time, 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 is controlled at 1170～1220 ℃, 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 ℃, the mill speed of finishing mill is 5～10m/s, and finishing temperature is 850～860 ℃, the coiling temperature of coiling machine is 580～610 ℃.
7. according to the zerolling technology of the flexibility described in any one in claim 4 to 6, further comprising the steps of:
In the laminar cooling process of steel, adopt edge-masking technology to reduce hot-strip at the limit of cooling procedure portion temperature drop.
8. according to the zerolling technology of the flexibility described in any one in claim 4 to 6, further comprising the steps of:
At rough rolling process, adopt stay-warm case to reduce rough rolling process temperature drop.
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Cited By (4)
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| WO2019001262A1 (en) * | 2017-06-28 | 2019-01-03 | 武汉理工大学 | Process for forming, by means of warm ring rolling, high-carbon chromium bearing steel capable of structure spheroidization |
| CN109590339A (en) * | 2018-12-06 | 2019-04-09 | 武汉钢铁有限公司 | A kind of hot rolling quality of edges control method of low temperature high magnetic induction grain-oriented silicon steel |
| CN113649421A (en) * | 2021-07-07 | 2021-11-16 | 阳春新钢铁有限责任公司 | Control system and method for temperature drop compensation of finish rolling inlet |
| CN114369753A (en) * | 2022-01-07 | 2022-04-19 | 鞍钢股份有限公司 | Method for producing multi-strength-level alloy structural steel based on flexible rolling technology |
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| CN113649421A (en) * | 2021-07-07 | 2021-11-16 | 阳春新钢铁有限责任公司 | Control system and method for temperature drop compensation of finish rolling inlet |
| CN114369753A (en) * | 2022-01-07 | 2022-04-19 | 鞍钢股份有限公司 | Method for producing multi-strength-level alloy structural steel based on flexible rolling technology |
| CN114369753B (en) * | 2022-01-07 | 2023-03-03 | 鞍钢股份有限公司 | Method for producing multi-strength-level alloy structural steel based on flexible rolling technology |
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