CN103331308A - 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 the 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 the hot rolling production process, steel billet heating energy consumption generally accounts for 70% ~ 80% of process energy consumption, is used for rolling energy consumption and only accounts for 20% ~ 30%, and the potentiality that therefore reduce the hot rolling energy consumption are mainly derived from the heating furnace energy consumption.In existing hot-strip production process, blank will heat raw material before rolling, improves the plasticity of steel, reduces resistance of deformation and improves metal inside tissue and performance, so that rolling processing.But high temperature and incorrect heating cycle may cause defectives such as the strong oxidation, decarburization, burning of steel, reduce the quality of steel, even cause waste product.Therefore, the heating-up temperature of steel should be according to characteristic and the rolling mill practice requirement of various steel, 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 that is distributed on the rolling line, can measure heating furnace tapping temperature (RH), roughing outlet temperature (RT), finish rolling inlet temperature (FT0), finish rolling finishing temperature (FT7), coiling temperature (CT) accurately, these temperature spots have constituted the online actual temperature resume of hot-continuous-rolling strip steel, online real process temperature is apparently higher than various critical-temperatures, as hot-short temperature, solid solubility temperature, separate out 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 the superfluous and milling equipment ability surplus of heating-up temperature.
The production technology of existing hot rolled strip also has the relevant report that reduces heating-up temperature." Huang Chuanqing; Chen Jianrong etc.; Baosteel 2050mm hot continuous rolling zerolling technology is used brief analysis; " bao steel technology " " introduced Baosteel in the zerolling The Application of Technology as document, heating-up temperature is reduced to 1200 ℃, by optimizing rolling procedure and the de-scaling passage of roughing, increases measures such as de-scaling dash chain, minimizing guarantees the inlet temperature of finish rolling at the temperature drop of rough rolling step.But this zerolling method, though heating-up temperature than 1250 ℃ low of original conventional heating-up temperatures, but mainly heating-up temperature is considered, the whole operation of rolling is not carried out the overall situation and systematic consideration.The patent No. is that the Chinese patent " warm rolling method " of CN200480013648.7 has been introduced a kind of novel multi-direction warm rolling method, be mainly used in the rolling of excellent wire rod, manufacturing has average grain diameter less than the ultra tiny crystal grain steel of the ultra tiny crystal grain tissue of 3 μ m, is that 350 ℃ ~ 800 ℃ temperature range is carried out groove rolling in temperature range.The patent No. is that the Chinese patent " warm rolling method of spiral " of CN94105678.2 has also proposed a kind of production method of utilizing waste heat after the hot rolling to carry out the warm-rolling spiral again, steel after the hot rolling are cooled to 600 ℃ ~ 300 ℃ at cold bed, it is rolling by attemperator steel to be delivered to roughing mill, and the wire rod after rolling carries out finish rolling tube reducing rag again.More than two patents be mainly used in the production of line bar, only the temperature of the operation of rolling is considered, equally an of overall importance and systematic consideration is not done in the zerolling of the whole operation of rolling yet.
In addition, the patent No. is that the Chinese patent " a kind of temperature-controlled rolling method of Q345 steel plate " of CN201010607955.5 has proposed the Q345 plate slab is come out of the stove behind preheating section, bringing-up section, soaking zone in pusher-type furnace, except removing iron scale, it is rolling to carry out the phase I at 1000 ℃ ~ 1050 ℃, and it is rolling that air cooling or water-cooled treat that temperature is carried out second stage to 900 ℃ ~ 950 ℃.This milling method, still the controlled rolling air cooling technology thinking that adopts guarantees 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 the consideration of energy-conservation aspect.Therefore, also be a kind of steel rolling production process of nonsystematic and locality.
In sum, the production method of existing hot rolled strip, main still conventional high temperature heating, the thinking that is rolled then, also have from the consideration that cuts down the consumption of energy, reduce the trial of heating-up temperature, but all be that each isolated point from heating or rolling process such as rolling goes to consider.Effect is not clearly.
Summary of the invention
Purpose 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 at the characteristics of carbon manganese steel, systematicness and zerolling production method of overall importance have been proposed, can guarantee the rolling back of carbon manganese steel favorable tissue, mechanical property level, can effectively reduce the heating energy consumption again, reduce production costs.
For realizing this purpose, the energy-saving milling method of the carbon manganese steel based on critical-temperature that the present invention is designed, comprise the step of de-scaling before carbon manganese steel slab process heating furnace The pre-heat treatment, heating furnace heat treated, the equal heat treatment of heating furnace, roughing successively, roughing, finish rolling, laminar flow cooling and coiling process, it is characterized in that:
The preheating time of described carbon manganese steel slab when the heating furnace The pre-heat treatment is 50 ~ 100min, and preheat temperature is 800 ~ 1000 ℃;
The heat time heating time of described carbon manganese steel slab when the heating furnace heat treated is 40 ~ 70min, and heating-up temperature is 1150 ~ 1220 ℃;
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 ℃;
The roughing outlet temperature of described carbon manganese steel slab when roughing is 1000 ~ 1050 ℃;
The finish rolling inlet temperature of described carbon manganese steel slab when finish rolling is 980 ~ 1020 ℃, and described finish rolling outlet temperature is 850 ~ 880 ℃;
Described carbon manganese steel slab temperature when take-up is 620 ~ 680 ℃.
Further, the chemical composition of described carbon manganese steel slab wt% by mass percentage 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 unavoidable impurities.
Further, the air-fuel ratio of described carbon manganese steel slab when the heating furnace The pre-heat treatment is 1.0 ~ 1.2; The air-fuel ratio of described carbon manganese steel slab when the heating furnace heat treated is 0.9 ~ 1.1; Described carbon manganese steel slab in the combustion of the equal heat treatment space-time of heating furnace 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 in the de-scaling processing procedure is 4 ~ 8 roads before the described roughing.
Further, the mill speed of described carbon manganese steel slab when finish rolling is 5.5m/s ~ 14m/s.
The present invention's rolling temperature history when rolling carbon manganese steel slab more carries out the consideration of system on the basis close to rolling critical-temperature curve between pair rolling temperature history and rolling critical-temperature.Simultaneously, the rolling method that the present invention proposes, be different from second generation TMCP(Thermo Mechanical Control Process, heat machinery control technology) being intended to low temperature depresses the rolling technology of thin crystalline substance greatly, this technology does not reduce heating-up temperature, just take to depress crystal grain thinning greatly under the lower temperature in the finish rolling section, and the present invention is just owing to reduce heating-up temperature, cause finish rolling section temperature low than pair rolling, depress and do not do bigger adjustment.In addition, the present invention is different with the low temperature ferrite rolling technology of research both at home and abroad, and is when the hot rolled strip of rolling carbon manganese steel slab, still rolling in single-phase austenitic area, reduce heating-up temperature and other process temperature, reached the technique effect that reduces the heating furnace energy consumption.And the tissue of the hot rolled strip after rolling still is ferrite+pearlite, good mechanical properties.
The specific embodiment
The present invention is described in further detail below in conjunction with specific embodiment:
The operation of rolling of conventional hot rolled strip only considers to be out of shape and depresses and the support equipment security problems that heating-up temperature and operation of rolling temperature are generally higher.Therefore, in actual hot rolled strip production process, the capacity utilization ratio of milling equipment is not high, and because too high heating-up temperature causes slab energy resource consumption in the process of heating furnace heating more.The present invention proposes the energy-saving milling method of a kind of carbon manganese steel based on critical-temperature, this method is on the basis that guarantees the original mechanical property of carbon manganese steel, by calculate and the checking carbon manganese steel in the critical-temperature of the required operation of rolling, and make the milling method of carbon manganese steel on the basis of critical-temperature.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 mill 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 (finishing mill power energy), T (recrystallization mark)]
FT7=T(Ar3)
CT=T (phase transition temperature)
In the above-mentioned formula: T is temperature, and RH is that soaking zone heating critical-temperature, RT are that roughing outlet critical-temperature, FT0 are that the critical-temperature of finish rolling entrance, FT7 are that finish rolling outlet critical-temperature, CT are for batching critical-temperature.The hot-short temperature of the hot-short slab of T (hot-short) representative, slab is than easy fracture under this temperature; T (roughing mill power energy) represents the temperature under roughing mill operation of rolling roll-force and the power permission; T (nipping of milling train) represents the milling train needed temperature of slab of nipping; Δ T transportation temperature drop represents roughing to the temperature loss of finish rolling slab transportation on roller-way; T (recrystallization mark) represents microstructure and the required temperature that reaches of mechanical property after the controlled rolling; T (phase transition temperature) represents the temperature spot of the generation phase transformation of mild steel.T (C solid solution) represents the temperature that the C solid solution needs, T (Mn solid solution) represents the temperature that the Mn solid solution needs, T (de-scaling) representative reaches the heating-up temperature that good scale removal effect needs, and 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 de-scaling before carbon manganese steel slab process heating furnace The pre-heat treatment, heating furnace heat treated, the equal heat treatment of heating furnace, roughing successively, roughing, finish rolling, laminar flow cooling and coiling process, it is characterized in that:
The preheating time of described carbon manganese steel slab when the heating furnace The pre-heat treatment is 50 ~ 100min, and preheat temperature is 800 ~ 1000 ℃;
The heat time heating time of described carbon manganese steel slab when the heating furnace heat treated is 40 ~ 70min, and heating-up temperature is 1150 ~ 1220 ℃;
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 ℃;
The roughing outlet temperature of described carbon manganese steel slab when roughing is 1000 ~ 1050 ℃;
The finish rolling inlet temperature of described carbon manganese steel slab when finish rolling is 980 ~ 1020 ℃, and described finish rolling outlet temperature is 850 ~ 880 ℃; The finish rolling entrance remains unchanged basically on original temperature schedule or slightly reduces;
Described carbon manganese steel slab temperature when take-up is 620 ~ 680 ℃.
In the technique scheme, the carbon manganese steel slab is in the zerolling process, because the reduction of deformation temperature, the mechanical property of band steel can have a certain upgrade; Simultaneously, consider that chilling process can cause the difficulty of de-scaling, therefore the chemical composition to the carbon manganese steel slab formulates the following rules on the basis of comprehensive mechanical property and surface quality.The chemical composition of described carbon manganese steel slab wt% by mass percentage 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 unavoidable impurities.
In the technique scheme, the air-fuel ratio of described carbon manganese steel slab when the heating furnace The pre-heat treatment is 1.0 ~ 1.2; The air-fuel ratio of described carbon manganese steel slab when the heating furnace heat treated is 0.9 ~ 1.1; Described carbon manganese steel slab in the combustion of the equal heat treatment space-time of heating furnace than being 1.0 ~ 1.4.
In the technique scheme, described carbon manganese steel slab is 150min ~ 180min at total time inside furnace of heating furnace.
In the technique scheme, the furnace pressure of described heating furnace is the pressure-fired of 10 ~ 25Pa, prevents that heating furnace from sucking cold wind.
In the technique scheme, the de-scaling passage before the described roughing in the de-scaling processing procedure is 4 ~ 8 roads.Need to guarantee the surface quality of carbon manganese steel slab in the roughing process, and adopt stay-warm case to reduce the temperature drop of roughing process.
In the technique scheme, the mill speed of described carbon manganese steel slab when finish rolling is 5.5m/s ~ 14m/s.By promoting mill speed, guarantee that finish rolling outlet temperature and coiling temperature remain unchanged at original conventional hot rolling technology,
In the technique scheme, when carbon manganese steel slab laminar flow cooling procedure, adopt the edge-masking technology, reduce the limit portion temperature drop of hot-strip in cooling procedure.
Embodiment 1
According to requirement of the present invention, the carbon manganese steel slab of low-carbon (LC) low manganess steel composition has been carried out Rolling Production, the condition of production of choosing 3 blocks of carbon manganese steel slabs describes, and the chemical composition of carbon manganese steel slab sees Table 1, and the zerolling process temperature sees Table 2.
Table 1 is smelted composition
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 the stove, the preheating section air-fuel ratio remains on 1.09, and be 72min preheating time, and the bringing-up section air-fuel ratio remains on 0.98, heat time heating time 68min, the soaking zone air-fuel ratio remains on 1.14, soaking temperature is controlled at 1172 ℃, soaking time is 26min.When roughing is rolling, take three quarter continuous rolling mill rolling, first group of roughing mill de-scaling 1 road, second group of rolling 5 passage of roughing mill, de-scaling 3 roads, the 3rd group of roughing mill de-scaling 1 road, the 4th group of not de-scaling of roughing mill, total de-scaling passage is 5 passages, adopts stay-warm case to reduce the temperature drop of roughing process, and the roughing outlet temperature is 1037 ℃, the finish rolling inlet temperature is 1002 ℃, mill speed is 9.67m/s during finish rolling, and the finish rolling outlet temperature is 874 ℃, and coiling temperature is 650 ℃, adopt the edge-masking technology in the laminar flow cooling procedure, reduce hot-strip at the limit of cooling procedure portion temperature drop.
Slab 2 is 177min at total time inside furnace of heating process.Keep pressure-fired 20Pa in the stove, the preheating section air-fuel ratio remains on 1.2, and be 83min preheating time, and the bringing-up section air-fuel ratio remains on 1.01, and be 70min heat time heating time, and the soaking zone air-fuel ratio remains on 1.18, and soaking temperature is controlled at 1180 ℃, and soaking time is 24min.When roughing is rolling, take three quarter continuous rolling mill rolling, first group of roughing mill de-scaling 1 road, second group of rolling 5 passage of roughing mill, de-scaling 3 roads, the 3rd group of roughing mill de-scaling 1 road, the 4th group of not de-scaling of roughing mill, total de-scaling passage is 5 passages, and adopts stay-warm case to reduce the temperature drop of roughing process, and the roughing outlet temperature is 1050 ℃, the finish rolling inlet temperature is 1020 ℃, mill speed is 9.33m/s during finish rolling, and the finish rolling outlet temperature is 880 ℃, and coiling temperature is 648 ℃, in the laminar flow cooling procedure, adopt the edge-masking technology, reduce hot-strip at the limit of cooling procedure portion temperature drop.
Slab 3 is 160min at total time inside furnace of heating process.Keep pressure-fired 22Pa in the stove, the preheating section air-fuel ratio remains on 1.15, and be 79min preheating time, and the bringing-up section air-fuel ratio remains on 0.95, and be 58min heat time heating time, and the soaking zone air-fuel ratio remains on 1.23, and soaking temperature is controlled at 1172 ℃, and soaking time is 23min.When roughing is rolling, take three quarter continuous rolling mill rolling, first group of roughing mill de-scaling 1 road, second group of rolling 5 passage of roughing mill, de-scaling 3 roads, the 3rd group of roughing mill de-scaling 1 road, the 4th group of not de-scaling of roughing mill, total de-scaling passage is 5 passages, adopt stay-warm case to reduce the temperature drop of roughing process, the roughing outlet temperature is 1034 ℃.The finish rolling inlet temperature is 1008 ℃, and the mill speed during finish rolling is 9.82m/S, and the finish rolling outlet temperature is 861 ℃, and coiling temperature is 651 ℃, adopts the edge-masking technology in the laminar flow cooling procedure, reduces hot-strip at the limit of cooling procedure portion temperature drop.
The hot-rolled sheet coil mechanical property contrast that above-mentioned 3 slab rollings go out sees Table 3
Table 3 tissue, mechanical property contrast
This shows, more than the requirement of all satisfying standard of the coil of strip tissue that goes out of 3 slab rollings and mechanical property.
Embodiment 2
According to requirement of the present invention, carbon in the carbon manganese steel of comparing embodiment 1 and the slightly high carbon manganese steel slab of manganese composition have been carried out Rolling Production, the condition of production of choosing 3 blocks of slabs describes, and the chemical composition of carbon manganese steel slab sees Table 4, and the zerolling process temperature sees Table 5
Table 4 is smelted composition
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 the stove, the preheating section air-fuel ratio remains on 1.2, and be 78min preheating time, and the bringing-up section air-fuel ratio remains on 1.08, and be 70min heat time heating time, and the soaking zone air-fuel ratio remains on 1.11, and soaking temperature is controlled at 1172 ℃, and soaking time is 22min.When roughing is rolling, take three quarter continuous rolling mill rolling, first group of roughing mill de-scaling 1 road, second group of rolling 5 passage of roughing mill, de-scaling 2 roads, the 3rd group of roughing mill de-scaling 1 road, the 4th group of not de-scaling of roughing mill, total de-scaling passage is 4 passages, adopt stay-warm case to reduce the temperature drop of roughing process, the roughing outlet temperature is 1048 ℃.The finish rolling inlet temperature is 1020 ℃, and the mill speed of finish rolling is 5.7m/s, and the finish rolling outlet temperature is 871 ℃, and coiling temperature is 670 ℃, adopts the edge-masking technology in the laminar flow cooling procedure, reduces hot-strip at the limit of cooling procedure portion temperature drop.
Slab 2 is 179min at total time inside furnace of heating process.Keep pressure-fired 20Pa in the stove, the preheating section air-fuel ratio remains on 1.08, and be 100min preheating time, and the bringing-up section air-fuel ratio remains on 1.09, and be 53min heat time heating time, and the soaking zone air-fuel ratio remains on 1.29, and soaking temperature is controlled at 1180 ℃, and soaking time is 26min.When roughing is rolling, take three quarter continuous rolling mill rolling, first group of roughing mill de-scaling 1 road, second group of rolling 5 passage of roughing mill, de-scaling 2 roads, the 3rd group of roughing mill de-scaling 1 road, the 4th group of not de-scaling of roughing mill, total de-scaling passage is 4 passages, adopts stay-warm case to reduce the temperature drop of roughing process, and the roughing outlet temperature is 1050 ℃, 1012 ℃ of finish rolling inlet temperatures, the mill speed of finish rolling is 7.5m/S, and the finish rolling outlet temperature is 879 ℃, and coiling temperature is 680 ℃, in the laminar flow cooling procedure, adopt the edge-masking technology, reduce hot-strip at the limit of cooling procedure portion temperature drop.
Slab 3 is 153min at total time inside furnace of heating process.Keep pressure-fired 22Pa in the stove, the preheating section air-fuel ratio remains on 1.09, and be 61min preheating time, and the bringing-up section air-fuel ratio remains on 1.1, and be 68min heat time heating time, and the soaking zone air-fuel ratio remains on 1.29, and soaking temperature is controlled at 1172 ℃, and soaking time is 24min.In roughing is rolling, take three quarter continuous rolling mill rolling, first group of roughing mill de-scaling 1 road, second group of rolling 5 passage of roughing mill, de-scaling 2 roads, the 3rd group of roughing mill de-scaling 1 road, the 4th group of not de-scaling of roughing mill, total de-scaling passage is 4 passages, adopt stay-warm case to reduce the temperature drop of roughing process, the roughing outlet temperature is 1040 ℃.The finish rolling inlet temperature is 1020 ℃, and the mill speed of finish rolling is 7.83m/s, and the finish rolling outlet temperature is 872 ℃, and coiling temperature is 675 ℃, adopts the edge-masking technology in the laminar flow cooling procedure, reduces hot-strip at the limit of cooling procedure portion temperature drop.
The hot-rolled sheet coil mechanical property contrast that above-mentioned 3 slab rollings go out sees Table 6.
Table 6 tissue, mechanical property contrast
This shows, more than 3 slab rollings the coil of strip tissue and the mechanical property that go out all satisfy standard-required.
By present embodiment as can be seen: the characteristics that the present invention is directed to the carbon manganese steel slab, systematicness and zerolling production method of overall importance have been proposed, whole heating and Rolling Production process have been taken all factors into consideration, carbon manganese steel slab favorable tissue and mechanical property level can be guaranteed, the heating energy consumption can be effectively reduced again.
The content that specification is not described in detail belongs to this area professional and technical personnel's known prior art.
Claims (7)
1. energy-saving milling method of the carbon manganese steel based on critical-temperature, comprise the step of de-scaling before carbon manganese steel slab process heating furnace The pre-heat treatment, heating furnace heat treated, the equal heat treatment of heating furnace, roughing successively, roughing, finish rolling, laminar flow cooling and coiling process, it is characterized in that:
The preheating time of described carbon manganese steel slab when the heating furnace The pre-heat treatment is 50 ~ 100min, and preheat temperature is 800 ~ 1000 ℃;
The heat time heating time of described carbon manganese steel slab when the heating furnace heat treated is 40 ~ 70min, and heating-up temperature is 1150 ~ 1220 ℃;
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 ℃;
The roughing outlet temperature of described carbon manganese steel slab when roughing is 1000 ~ 1050 ℃;
The finish rolling inlet temperature of described carbon manganese steel slab when finish rolling is 980 ~ 1020 ℃, and described finish rolling outlet temperature is 850 ~ 880 ℃;
Described carbon manganese steel slab temperature when take-up is 620 ~ 680 ℃.
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 wt% by mass percentage 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 unavoidable impurities.
3. the energy-saving milling method of the carbon manganese steel based on critical-temperature according to claim 1 and 2, it is characterized in that: the air-fuel ratio of described carbon manganese steel slab when the heating furnace The pre-heat treatment is 1.0 ~ 1.2; The air-fuel ratio of described carbon manganese steel slab when the heating furnace heat treated is 0.9 ~ 1.1; Described carbon manganese steel slab in the combustion of the equal heat treatment space-time of heating furnace than being 1.0 ~ 1.4.
4. the energy-saving milling method of the carbon manganese steel based on critical-temperature according to claim 1 and 2, it is characterized in that: described carbon manganese steel slab is 150min ~ 180min at total time inside furnace of heating furnace.
5. the energy-saving milling method of the carbon manganese steel based on critical-temperature according to claim 1 and 2, it is characterized in that: the furnace pressure of described heating furnace is 10 ~ 25Pa.
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 de-scaling passage before the described roughing in the de-scaling processing procedure is 4 ~ 8 roads.
7. the energy-saving milling method of the carbon manganese steel based on critical-temperature according to claim 1 and 2, it 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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| CN104014593A (en) * | 2014-05-30 | 2014-09-03 | 济钢集团有限公司 | Method for controlling surface piebald defect of structural low alloy steel medium and thick plates |
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| CN107983771A (en) * | 2017-11-23 | 2018-05-04 | 攀钢集团攀枝花钢铁研究院有限公司 | The high-strength chill volume hot-rolling method of building concrete fixing piece |
| CN110479762A (en) * | 2019-08-15 | 2019-11-22 | 武汉钢铁有限公司 | A kind of hot-strip completely continuous manufacturing device and method for ferrite rolling |
| CN110814052A (en) * | 2019-09-29 | 2020-02-21 | 太原科技大学 | Online sensing method for plate temperature of large-strain hot rolling deformation area of magnesium alloy plate |
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| CN107983771B (en) * | 2017-11-23 | 2020-03-17 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength cold-hard coil hot rolling method for building concrete fixing piece |
| CN110479762A (en) * | 2019-08-15 | 2019-11-22 | 武汉钢铁有限公司 | A kind of hot-strip completely continuous manufacturing device and method for ferrite rolling |
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| CN110814052A (en) * | 2019-09-29 | 2020-02-21 | 太原科技大学 | Online sensing method for plate temperature of large-strain hot rolling deformation area of magnesium alloy plate |
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