CN103331308B - Energy-saving carbon manganese steel rolling method based on critical temperature - Google Patents
Energy-saving carbon manganese steel rolling method based on critical temperature Download PDFInfo
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Abstract
The invention discloses an energy-saving carbon manganese steel rolling method based on a critical temperature, which comprises the steps that a carbon manganese steel plate blank is subjected to heating furnace preheating treatment, heating furnace heating treatment, heating furnace soaking treatment, scale removal, rough rolling, finish rolling, laminar flow cooling and reeling procedures sequentially. The preheating time of the carbon manganese steel plate blank is 50-100min, and a preheating temperature is 800-1000 DEG C; the heating time is 40-70min, and a heating temperature is 1150-1220 DEG C; the soaking time is 20-40min, and a soaking temperature is 1140-1180 DEG C; an outlet temperature of rough rolling is 1000-1050 DEG C; an inlet temperature of finish rolling is 980-1020 DEG C; an outlet temperature of the finish rolling is 850-880 DEG C; and a reeling temperature is 620-680 DEG C. The method can guarantee good structural and mechanical property levels of the carbon manganese steel plate blank, and can effectively reduce heating energy consumption.
Description
Technical field
The present invention relates to hot rolled strip production technical field, refer to the energy-saving milling method of a kind of carbon manganese steel based on critical-temperature particularly.
Technical background
In hot rolling production process, heating steel billet energy consumption generally accounts for 70% ~ 80% of process energy consumption, and the energy consumption for rolling only accounts for 20% ~ 30%, and the potentiality therefore reducing hot rolling energy consumption are mainly derived from furnace energy consumption.In existing hot-strip production process, raw material before the rolling, heat by blank, improves the plasticity of steel, reduces resistance of deformation and improves metal inside structure and properties, so that rolling processing.But high temperature and incorrect heating cycle may cause the defect such as strong oxidation, decarburization, burning of steel, reduce the quality of steel, even cause waste product.Therefore, the heating-up temperature of steel should according to the characteristic of various steel and rolling mill practice requirement, and collateral security steel product quality and output are set out and determined.
In actual production process, belt steel temperature is measured by the infrared radiation thermometer be distributed on rolling line, heating furnace tapping temperature (RH), roughing outlet temperature (RT), entry temperature at finishing (FT0), finish rolling finishing temperature (FT7), coiling temperature (CT) can be measured accurately, these temperature spots constitute the online actual temperature resume of hot-continuous-rolling strip steel, online real process temperature apparently higher than various critical-temperature, as hot-short temperature, solid solubility temperature, Precipitation Temperature, phase transition temperature, de-scaling temperature, start rolling temperature and coiling temperature etc.Critical-temperature is each link minimum permissible temperature of production procedure, and too high real process temperature can cause heating-up temperature surplus and milling equipment ability surplus.
The production technology of existing hot rolled strip, also has the relevant report reducing heating-up temperature.As document " Huang Chuanqing; Chen Jianrong etc.; Baosteel 2050mm hot continuous rolling zerolling technology application brief analysis; " bao steel technology " " describes the application of Baosteel in zerolling technology, heating-up temperature being reduced to 1200 DEG C, by optimizing rolling procedure and the de-scaling passage of roughing, increasing the measures such as de-scaling dash chain, reduce the temperature drop at rough rolling step, ensure the inlet temperature of finish rolling.But this zerolling method, although heating-up temperature is lower than original conventional heating temperature 1250 DEG C, but mainly considers heating-up temperature, does not carry out the overall situation and systematic consideration to the whole operation of rolling.The patent No. is that the Chinese patent " warm rolling method " of CN200480013648.7 describes a kind of novel multi-direction warm rolling method, be mainly used in the rolling of Bar Wire Product, manufacture the ultra tiny crystal grain steel having average grain diameter and be less than the ultra tiny grain structure of 3 μm, the temperature range being 350 DEG C ~ 800 DEG C in temperature range carries out groove rolling.The patent No. be the Chinese patent " warm rolling method of spiral " of CN94105678.2 it is also proposed a kind of utilize hot rolling after waste heat carry out the production method of warm-rolling spiral again, steel after hot rolling are cooled on cold bed 600 DEG C ~ 300 DEG C, by attemperator, steel are delivered to roughing mill rolling, the wire rod after rolling carries out finish rolling tube reducing rag again.Above two patents are mainly used in the production of wire and rod, only consider the temperature of the operation of rolling, equally also do not do an of overall importance and systematic consideration to the zerolling of the whole operation of rolling.
In addition, the patent No. is that the Chinese patent " a kind of temperature-controlled rolling method of Q345 steel plate " of CN201010607955.5 proposes and come out of the stove after preheating section, bringing-up section, soaking zone in pusher-type furnace by Q345 plate slab, except removing iron scale, carry out first stage rolling at 1000 DEG C ~ 1050 DEG C, air cooling or water-cooled treat that temperature carries out second stage rolling to 900 DEG C ~ 950 DEG C.This milling method, or the controlled rolling air cooling technique thinking adopted ensures the mechanical property of Q345 steel plate, does not adopt critical-temperature thought, also heating-up temperature and the whole operation of rolling is not carried out to the consideration of energy-conservation aspect.Therefore, be also a kind of Rolling production process of nonsystematic and locality.
In sum, the production method of existing hot rolled strip, main or conventional high-temperature heating, then the thinking be rolled, also have and consider from reduction energy consumption, reduce the trial of heating-up temperature, but be all go to consider from each isolated point of the rolling process such as heating or rolling.Effect is not clearly.
Summary of the invention
Object of the present invention is exactly to provide a kind of carbon manganese steel based on critical-temperature energy-saving milling method, this milling method is for the feature of carbon manganese steel, propose systematicness and zerolling production method of overall importance, tissue good after can ensureing carbon manganese steel rolling, mechanical property level, heating energy consumption can be effectively reduced again, reduce production cost.
For realizing this object, the energy-saving milling method of the carbon manganese steel based on critical-temperature designed by the present invention, comprise the step of carbon manganese steel slab successively de-scaling before heating furnace the pre-heat treatment, heating furnace heating, the equal heat treatment of heating furnace, roughing, roughing, finish rolling, section cooling and coiling process, it is characterized in that:
The preheating time of described carbon manganese steel slab when heating furnace the pre-heat treatment is 50 ~ 100min, and preheat temperature is 800 ~ 1000 DEG C;
The heat time of described carbon manganese steel slab when heating furnace heats is 40 ~ 70min, and heating-up temperature is 1150 ~ 1220 DEG C;
The soaking time of described carbon manganese steel slab when the equal heat treatment of heating furnace is 20 ~ 40min, and soaking temperature is 1140 ~ 1180 DEG C;
The roughing outlet temperature of described carbon manganese steel slab when roughing is 1000 ~ 1050 DEG C;
The entry temperature at finishing of described carbon manganese steel slab when finish rolling is 980 ~ 1020 DEG C, and described exit temperature at finishing is 850 ~ 880 DEG C;
Described carbon manganese steel slab temperature is when take-up 620 ~ 680 DEG C.
Further, the chemical composition of described carbon manganese steel slab by mass percentage wt% is C:0.01 ~ 0.08%, Si:0.01 ~ 0.20%, Mn:0.01 ~ 0.5%, S≤0.030%, P≤0.030%, and all the other are iron and inevitable impurity.
Further, the air-fuel ratio of described carbon manganese steel slab when heating furnace the pre-heat treatment is 1.0 ~ 1.2; The air-fuel ratio of described carbon manganese steel slab when heating furnace heats is 0.9 ~ 1.1; Described carbon manganese steel slab in the combustion of heating furnace equal heat treatment space-time than being 1.0 ~ 1.4.
Further, described carbon manganese steel slab is 150min ~ 180min at total time inside furnace of heating furnace.
Further, the furnace pressure of described heating furnace is 10 ~ 25Pa.
Further, the de-scaling passage before described roughing in de-scaling processing procedure is 4 ~ 8 roads.
Further, the mill speed of described carbon manganese steel slab when finish rolling is 5.5m/s ~ 14m/s.
The temperature history of the present invention's rolling when rolling carbon manganese steel slab between pair rolling temperature history and rolling critical-temperature, closer to the consideration basis of rolling Critical Temperature Curve being carried out system.Simultaneously, the rolling method that the present invention proposes, be different from second generation TMCP(Thermo Mechanical Control Process, thermomechanical Controlling Technology) be intended to the technology of the thin brilliant rolling of the large pressure of low temperature, this technology does not reduce heating-up temperature, and the large pressure just under finish rolling section takes lower temperature carrys out crystal grain thinning, and the present invention is just owing to reducing heating-up temperature, comparatively pair rolling is low to cause finish rolling section temperature, and larger adjustment is not done in pressure.In addition, the present invention is different from the Low-temperature Iron ferritic rolling technique studied both at home and abroad, when the hot rolled strip of rolling carbon manganese steel slab, or in the rolling of single phase austenite district, reduce heating-up temperature and other process temperature, reach the technique effect reducing furnace energy consumption.Further, the tissue of the hot rolled strip after rolling or ferrite+pearlite, good mechanical properties.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
The operation of rolling of conventional hot rolled strip, only considers distortion pressure and support equipment security problems, heating-up temperature and operation of rolling temperature generally higher.Therefore, in actual hot rolled strip production process, the capacity utilization ratio of milling equipment is not high, and in the process causing slab to heat at heating furnace due to too high heating-up temperature, energy resource consumption is more.The present invention proposes the energy-saving milling method of a kind of carbon manganese steel based on critical-temperature, the method is on the basis ensureing the original mechanical property of carbon manganese steel, by calculating and verifying the critical-temperature of carbon manganese steel in the required operation of rolling, and on the basis of critical-temperature, make the milling method of carbon manganese steel.The critical-temperature of the carbon manganese steel operation of rolling is determined by following formula:
RH=Max [T (hot-short), T (C solid solution), T (Mn solid solution), T (de-scaling)]
RT=Max [T (roughing machine power energy), T (nipping of milling train), 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 (finish rolling machine power energy), T (recrystallization mark)]
FT7=T(Ar3)
CT=T (phase transition temperature)
In above-mentioned formula: T is temperature, RH is soaking zone heating critical-temperature, RT is roughing outlet critical-temperature, FT0 is the critical-temperature of finish rolling entrance, FT7 is that finish rolling outlet critical-temperature, CT are for batching critical-temperature.T (hot-short) represents the hot-short temperature of hot-short slab, at this temperature slab comparatively easy fracture; T (roughing machine power energy) represents the temperature under roughing mill operation of rolling roll-force and power permission; T (nipping of milling train) represents the temperature that milling train is nipped required for slab; Δ T transportation temperature drop represents the temperature loss of roughing to finish rolling slab transportation on roller-way; The temperature reached required for microstructure after T (recrystallization mark) represents controlled rolling and mechanical property; T (phase transition temperature) represents the temperature spot of the generation phase transformation of mild steel.T (C solid solution) represents the temperature that C solid solution needs, T (Mn solid solution) represents the temperature that Mn solid solution needs, T (de-scaling) representative reaches the heating-up temperature that good scale removal effect needs, Δ T de-scaling temperature drop represents the temperature drop that high-pressure water descaling causes, and T (Ar3) represents austenite transformation temperature.
The energy-saving milling method of carbon manganese steel based on critical-temperature of the present invention's design, comprise the step of carbon manganese steel slab successively de-scaling before heating furnace the pre-heat treatment, heating furnace heating, the equal heat treatment of heating furnace, roughing, roughing, finish rolling, section cooling and coiling process, it is characterized in that:
The preheating time of described carbon manganese steel slab when heating furnace the pre-heat treatment is 50 ~ 100min, and preheat temperature is 800 ~ 1000 DEG C;
The heat time of described carbon manganese steel slab when heating furnace heats is 40 ~ 70min, and heating-up temperature is 1150 ~ 1220 DEG C;
The soaking time of described carbon manganese steel slab when the equal heat treatment of heating furnace is 20 ~ 40min, and soaking temperature is 1140 ~ 1180 DEG C;
The roughing outlet temperature of described carbon manganese steel slab when roughing is 1000 ~ 1050 DEG C;
The entry temperature at finishing of described carbon manganese steel slab when finish rolling is 980 ~ 1020 DEG C, and described exit temperature at finishing is 850 ~ 880 DEG C; Finish rolling entrance substantially remains unchanged or slightly reduces in original temperature schedule;
Described carbon manganese steel slab temperature is when take-up 620 ~ 680 DEG C.
In technique scheme, carbon manganese steel slab is in zerolling process, and due to the reduction of deformation temperature, the mechanical property of band steel can have a certain upgrade; Meanwhile, consider that chilling process can cause the difficulty of de-scaling, therefore on the basis of comprehensive mechanical property and surface quality, the chemical composition of carbon manganese steel slab is formulated the following rules.The chemical composition of described carbon manganese steel slab by mass percentage wt% is C:0.01 ~ 0.08%, Si:0.01 ~ 0.20%, Mn:0.01 ~ 0.5%, S≤0.030%, P≤0.030%, and all the other are iron and inevitable impurity.
In technique scheme, the air-fuel ratio of described carbon manganese steel slab when heating furnace the pre-heat treatment is 1.0 ~ 1.2; The air-fuel ratio of described carbon manganese steel slab when heating furnace heats is 0.9 ~ 1.1; Described carbon manganese steel slab in the combustion of heating furnace equal heat treatment space-time than being 1.0 ~ 1.4.
In technique scheme, described carbon manganese steel slab is 150min ~ 180min at total time inside furnace of heating furnace.
In technique scheme, the furnace pressure of described heating furnace is the pressure-fired of 10 ~ 25Pa, prevents heating furnace from sucking cold wind.
In technique scheme, the de-scaling passage before described roughing in de-scaling processing procedure is 4 ~ 8 roads.Need the surface quality ensureing carbon manganese steel slab in rough rolling process, and adopt stay-warm case to reduce the temperature drop of rough rolling process.
In technique scheme, the mill speed of described carbon manganese steel slab when finish rolling is 5.5m/s ~ 14m/s.By promoting mill speed, ensure that exit temperature at finishing and coiling temperature remain unchanged on original conventional hot rolling technology,
In technique scheme, adopt edge-masking technology when carbon manganese steel slab laminar cooling process, reduce the edge temperature drop of hot-strip in cooling procedure.
Embodiment 1
According to requirement of the present invention, carried out Rolling Production to the carbon manganese steel slab of low-carbon (LC) low manganess steel composition, the condition of production choosing 3 blocks of carbon manganese steel slabs is described, and the chemical composition of carbon manganese steel slab is in table 1, and zerolling process temperature is in table 2.
Composition smelted by table 1
Table 2 embodiment 1 operation of rolling temperature
Slab 1 is 156min at total time inside furnace of heating process.Keep pressure-fired 25Pa in stove, preheating section air-fuel ratio remains on 1.09, and preheating time is 72min, and bringing-up section air-fuel ratio remains on 0.98, heat time 68min, and soaking zone air-fuel ratio remains on 1.14, and soaking temperature controls at 1172 DEG C, and soaking time is 26min.Three quarter continuous rolling mill rolling is taked when roughing rolling, first group of roughing mill de-scaling 1 road, second group of roughing mill rolling 5 passage, de-scaling 3 road, 3rd group of roughing mill de-scaling 1 road, 4th group of roughing mill not de-scaling, total de-scaling passage is 5 passages, stay-warm case is adopted to reduce the temperature drop of rough rolling process, roughing outlet temperature is 1037 DEG C, entry temperature at finishing is 1002 DEG C, during finish rolling, mill speed is 9.67m/s, exit temperature at finishing is 874 DEG C, coiling temperature is 650 DEG C, edge-masking technology is adopted at laminar cooling process, reduce the edge temperature drop of hot-strip in cooling procedure.
Slab 2 is 177min at total time inside furnace of heating process.Keep pressure-fired 20Pa in stove, preheating section air-fuel ratio remains on 1.2, and preheating time is 83min, and bringing-up section air-fuel ratio remains on 1.01, and the heat time is 70min, and soaking zone air-fuel ratio remains on 1.18, and soaking temperature controls at 1180 DEG C, and soaking time is 24min.Three quarter continuous rolling mill rolling is taked when roughing rolling, first group of roughing mill de-scaling 1 road, second group of roughing mill rolling 5 passage, de-scaling 3 road, 3rd group of roughing mill de-scaling 1 road, 4th group of roughing mill not de-scaling, total de-scaling passage is 5 passages, and adopt stay-warm case to reduce the temperature drop of rough rolling process, roughing outlet temperature is 1050 DEG C, entry temperature at finishing is 1020 DEG C, during finish rolling, mill speed is 9.33m/s, exit temperature at finishing is 880 DEG C, coiling temperature is 648 DEG C, edge-masking technology is adopted in laminar cooling process, reduce the edge temperature drop of hot-strip in cooling procedure.
Slab 3 is 160min at total time inside furnace of heating process.Keep pressure-fired 22Pa in stove, preheating section air-fuel ratio remains on 1.15, and preheating time is 79min, and bringing-up section air-fuel ratio remains on 0.95, and the heat time is 58min, and soaking zone air-fuel ratio remains on 1.23, and soaking temperature controls at 1172 DEG C, and soaking time is 23min.Three quarter continuous rolling mill rolling is taked when roughing rolling, first group of roughing mill de-scaling 1 road, second group of roughing mill rolling 5 passage, de-scaling 3 road, 3rd group of roughing mill de-scaling 1 road, the 4th group of roughing mill not de-scaling, total de-scaling passage is 5 passages, adopt stay-warm case to reduce the temperature drop of rough rolling process, roughing outlet temperature is 1034 DEG C.Entry temperature at finishing is 1008 DEG C, and mill speed during finish rolling is 9.82m/S, and exit temperature at finishing is 861 DEG C, and coiling temperature is 651 DEG C, adopts edge-masking technology in laminar cooling process, reduces the edge temperature drop of hot-strip in cooling procedure.
The hot-rolled sheet coil mechanical property contrast that above-mentioned 3 pieces of slab rollings go out is in table 3
Table 3 is organized, mechanical property contrast
As can be seen here, the coil of strip microstructure and mechanical property that above 3 pieces of slab rollings go out all meets the requirement of standard.
Embodiment 2
According to requirement of the present invention, carried out Rolling Production to carbon in the carbon manganese steel comparing embodiment 1 and the slightly high carbon manganese steel slab of manganese composition, the condition of production choosing 3 blocks of slabs is described, and the chemical composition of carbon manganese steel slab is in table 4, and zerolling process temperature is in table 5
Composition smelted by table 4
Table 5 embodiment 2 operation of rolling temperature
Slab 1 is 170min at total time inside furnace of heating process.Keep pressure-fired 25Pa in stove, preheating section air-fuel ratio remains on 1.2, and preheating time is 78min, and bringing-up section air-fuel ratio remains on 1.08, and the heat time is 70min, and soaking zone air-fuel ratio remains on 1.11, and soaking temperature controls at 1172 DEG C, and soaking time is 22min.Three quarter continuous rolling mill rolling is taked when roughing rolling, first group of roughing mill de-scaling 1 road, second group of roughing mill rolling 5 passage, de-scaling 2 road, 3rd group of roughing mill de-scaling 1 road, the 4th group of roughing mill not de-scaling, total de-scaling passage is 4 passages, adopt stay-warm case to reduce the temperature drop of rough rolling process, roughing outlet temperature is 1048 DEG C.Entry temperature at finishing is 1020 DEG C, and the mill speed of finish rolling is 5.7m/s, and exit temperature at finishing is 871 DEG C, and coiling temperature is 670 DEG C, adopts edge-masking technology in laminar cooling process, reduces the edge temperature drop of hot-strip in cooling procedure.
Slab 2 is 179min at total time inside furnace of heating process.Keep pressure-fired 20Pa in stove, preheating section air-fuel ratio remains on 1.08, and preheating time is 100min, and bringing-up section air-fuel ratio remains on 1.09, and the heat time is 53min, and soaking zone air-fuel ratio remains on 1.29, and soaking temperature controls at 1180 DEG C, and soaking time is 26min.Three quarter continuous rolling mill rolling is taked when roughing rolling, first group of roughing mill de-scaling 1 road, second group of roughing mill rolling 5 passage, de-scaling 2 road, 3rd group of roughing mill de-scaling 1 road, 4th group of roughing mill not de-scaling, total de-scaling passage is 4 passages, stay-warm case is adopted to reduce the temperature drop of rough rolling process, roughing outlet temperature is 1050 DEG C, entry temperature at finishing 1012 DEG C, the mill speed of finish rolling is 7.5m/S, exit temperature at finishing is 879 DEG C, coiling temperature is 680 DEG C, edge-masking technology is adopted in laminar cooling process, reduce the edge temperature drop of hot-strip in cooling procedure.
Slab 3 is 153min at total time inside furnace of heating process.Keep pressure-fired 22Pa in stove, preheating section air-fuel ratio remains on 1.09, and preheating time is 61min, and bringing-up section air-fuel ratio remains on 1.1, and the heat time is 68min, and soaking zone air-fuel ratio remains on 1.29, and soaking temperature controls at 1172 DEG C, and soaking time is 24min.Three quarter continuous rolling mill rolling is taked in roughing rolling, first group of roughing mill de-scaling 1 road, second group of roughing mill rolling 5 passage, de-scaling 2 road, 3rd group of roughing mill de-scaling 1 road, the 4th group of roughing mill not de-scaling, total de-scaling passage is 4 passages, adopt stay-warm case to reduce the temperature drop of rough rolling process, roughing outlet temperature is 1040 DEG C.Entry temperature at finishing is 1020 DEG C, and the mill speed of finish rolling is 7.83m/s, and exit temperature at finishing is 872 DEG C, and coiling temperature is 675 DEG C, adopts edge-masking technology in laminar cooling process, reduces the edge temperature drop of hot-strip in cooling procedure.
The hot-rolled sheet coil mechanical property contrast that above-mentioned 3 pieces of slab rollings go out is in table 6.
Table 6 is organized, mechanical property contrast
As can be seen here, the coil of strip microstructure and mechanical property that above 3 pieces of slab rollings go out all meets standard-required.
As can be seen from the present embodiment: the feature that the present invention is directed to carbon manganese steel slab, propose systematicness and zerolling production method of overall importance, whole heating and Rolling Production process are considered, can ensure the microstructure and mechanical property level that carbon manganese steel slab is good can effectively reduce heating energy consumption again.
The content that description is not described in detail belongs to the known prior art of professional and technical personnel in the field.
Claims (6)
1. the energy-saving milling method of the carbon manganese steel based on critical-temperature, comprise the step of carbon manganese steel slab successively de-scaling before heating furnace the pre-heat treatment, heating furnace heating, the equal heat treatment of heating furnace, roughing, roughing, finish rolling, section cooling and coiling process, it is characterized in that:
The preheating time of described carbon manganese steel slab when heating furnace the pre-heat treatment is 50 ~ 100min, and preheat temperature is 800 ~ 1000 DEG C;
The heat time of described carbon manganese steel slab when heating furnace heats is 40 ~ 70min, and heating-up temperature is 1150 ~ 1220 DEG C;
The soaking time of described carbon manganese steel slab when the equal heat treatment of heating furnace is 20 ~ 40min, and soaking temperature is 1140 ~ 1180 DEG C;
The roughing outlet temperature of described carbon manganese steel slab when roughing is 1000 ~ 1050 DEG C;
The entry temperature at finishing of described carbon manganese steel slab when finish rolling is 980 ~ 1020 DEG C, and described exit temperature at finishing is 850 ~ 880 DEG C;
Described carbon manganese steel slab temperature is when take-up 620 ~ 680 DEG C;
The air-fuel ratio of described carbon manganese steel slab when heating furnace the pre-heat treatment is 1.0 ~ 1.2; The air-fuel ratio of described carbon manganese steel slab when heating furnace heats is 0.9 ~ 1.1; Described carbon manganese steel slab in the combustion of heating furnace equal heat treatment space-time than being 1.0 ~ 1.4;
The critical-temperature of the carbon manganese steel operation of rolling is determined by following formula:
RH=Max [T (hot-short), T (C solid solution), T (Mn solid solution), T (de-scaling)]
RT=Max [T (roughing machine power energy), T (nipping of milling train), 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 (finish rolling machine power energy), T (recrystallization mark)]
FT7＝T(Ar3)
CT=T (phase transition temperature)
In above-mentioned formula: T is temperature, RH is soaking zone heating critical-temperature, RT is roughing outlet critical-temperature, FT0 is the critical-temperature of finish rolling entrance, FT7 is that finish rolling outlet critical-temperature, CT are for batching critical-temperature, T (hot-short) represents the hot-short temperature of hot-short slab, at this temperature slab comparatively easy fracture; T (roughing machine power energy) represents the temperature under roughing mill operation of rolling roll-force and power permission; T (nipping of milling train) represents the temperature that milling train is nipped required for slab; Δ T transportation temperature drop represents the temperature loss of roughing to finish rolling slab transportation on roller-way; The temperature reached required for microstructure after T (recrystallization mark) represents controlled rolling and mechanical property; T (phase transition temperature) represents the temperature spot of the generation phase transformation of mild steel, T (C solid solution) represents the temperature that C solid solution needs, T (Mn solid solution) represents the temperature that Mn solid solution needs, T (de-scaling) representative reaches the heating-up temperature that good scale removal effect needs, Δ T de-scaling temperature drop represents the temperature drop that high-pressure water descaling causes, and T (Ar3) represents austenite transformation temperature.
2. the energy-saving milling method of the carbon manganese steel based on critical-temperature according to claim 1, it is characterized in that: the chemical composition of described carbon manganese steel slab by mass percentage wt% is C:0.01 ~ 0.08%, Si:0.01 ~ 0.20%, Mn:0.01 ~ 0.5%, S≤0.030%, P≤0.030%, and all the other are iron and inevitable impurity.
3. the energy-saving milling method of the carbon manganese steel based on critical-temperature according to claim 1 and 2, is characterized in that: described carbon manganese steel slab is 150min ~ 180min at total time inside furnace of heating furnace.
4. the energy-saving milling method of the carbon manganese steel based on critical-temperature according to claim 1 and 2, is characterized in that: the furnace pressure of described heating furnace is 10 ~ 25Pa.
5. the energy-saving milling method of the carbon manganese steel based on critical-temperature according to claim 1 and 2, is characterized in that: the de-scaling passage before described roughing in de-scaling processing procedure is 4 ~ 8 roads.
6. the energy-saving milling method of the carbon manganese steel based on critical-temperature according to claim 1 and 2, is characterized in that: the mill speed of described carbon manganese steel slab when finish rolling is 5.5m/s ~ 14m/s.
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