CN105964966A - Hot delivery and hot charging process for bloom casting blanks - Google Patents
Hot delivery and hot charging process for bloom casting blanks Download PDFInfo
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- CN105964966A CN105964966A CN201610494405.4A CN201610494405A CN105964966A CN 105964966 A CN105964966 A CN 105964966A CN 201610494405 A CN201610494405 A CN 201610494405A CN 105964966 A CN105964966 A CN 105964966A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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Abstract
The invention discloses a hot delivery and hot charging process for bloom casting blanks, comprising the steps of firstly, additionally providing a heat insulation cover on a roller way where casting blanks do not enter a tension leveler and a heat insulation cover on a roller way located between a position that the casting blanks exit out of the tension leveler and a flame cutting position to perform heat insulation; before loading the casting blanks in a truck, firstly confirming a ventilation condition of a workshop to prevent convective wind from happening in a hot charging region; secondly, carrying out preliminary quality monitoring, firstly picking out abnormally-produced casting blanks in time in combination with operation monitoring of process equipment and online site inspection; thirdly, rapidly collecting the casting blanks, keeping the surface temperatures of the casting blanks at 555-625 DEG C before loading the casting blanks in the truck, and transporting the casting blanks in a way that one boiler steel is provided for one truck; and fourthly, transporting the casting blanks by using a heat insulation truck, delivering the casting blanks to a steel mill and waiting for entering a heating furnace once finishing the operation of loading the casting blanks in the truck, wherein the travel time is shorter than 50min; and when reaching the steel mill, unloading the casting blanks from the truck in time, and charging the casting blanks into the heating furnace, wherein the surface temperatures of the casting blanks need exceed 450 DEG C before the casting blanks are charged into the heating furnace, and meanwhile, the unloading and furnace charging time does not exceed 60min.
Description
Technical field
The present invention relates to continuous casting process, the technique of a kind of bloom strand hot delivery and hot charging.
Background technology
Iron and steel enterprise is the major power consumer in Industrial-Enterprises in China, and heater for rolling steel is production equipment important during iron and steel produces, and is also one of main energy consumption equipment.Energy-saving and cost-reducing, fundamentally reduce the cost of product, improve the economic performance of product, be the important means of the product commercially competitiveness improving oneself.For heater for rolling steel, in the past few decades, for fully excavating its energy-saving potential, Chinese scholars conducts extensive research for it and explores, and achieves and significantly apply effect, has greatly promoted the progress that reheating furnace energy-saving works.Such as: strengthen production management, improve, improve furnace construction, make full use of high-efficiency energy-saving technology equipment etc..The hot delivery and hot charging technology of heating furnace material base, was once listed in heating furnace and saved the important means of fuel reduction unit consumption.
Implement hot delivering technology of CC billets, it is necessary to assure the high temperature slab quality height produced and good stability, therefore continuous casting technology level plays a very important role in heat send engineering.In order to ensure that continuous casting produces normal, to improve conticaster operating rate, unplanned the breaking of continuous casting need to be strengthened further and water tackling key problem, thus the impact that reduction accident heat is stopped work.And by strengthening organization of production, improving smelting and continuous casting operation level, strengthening device spot check to ensure the direct motion of hot delivering technology of CC billets.Hot delivering technology of CC billets engineering is a system engineering, and tissue difficulty is big, with high content of technology, relate to organization of production, transport, measure, many departments and the specialty such as information network.
When some steel grades are carried out hot delivery and hot charging, surface defect usually occurs, especially in the winter that ambient temperature is low.Defect occurs with intercrystalline crack form, and batch triangular shape crackle occurs in stocking surface.It is relevant in austenite grain boundary precipitation with AlN or VCN, NbCN.AlN speed of separating out in austenite is very slow, when austenite is after ferritic transformation starts, and speed is greatly improved.Major part AlN is that speed of separating out is maximum when about 600～900 DEG C, and actual temperature range depends on carbon content and alloying element content.When AlN separates out, tiny AlN concentrates on γ crystal boundary, prevents the movement of crystal boundary in Formed During Metal Hot Deformation, and mechanical stress is assembled in grain boundary, when stress value exceedes affinity between crystal grain, just creates grain-boundary crack.In strand cooling procedure after solidification, C, N compound can be occurred to separate out in austenite grain boundary, weaken crystal boundary energy, cause A → F phase transformation, volumetric expansion exacerbates weakening of grain-boundary strength, will extend formation face crack when rolling.
All C content carbon steel below 0.3% and C-Mn steel, all surface hardening steel, and many have the steel alloy of fine grained texture, and quiet steel all there will be hot-short phenomenon, particularly containing remaining and that impurity element is higher electric steel.
Consequently, it is desirable to formulate rational heat to send technique and heating technique, to ensure the smooth enforcement of Process of Hot Transfering And Hot Charging.Strengthen continuous casting billet preservation and controlling during transporting, prevent continuous casting billet temperature drop during transporting, make full use of the heat energy of continuous casting billet, energy-conservation consumption can be realized.
Summary of the invention
The technical problem to be solved is, shortcoming for above prior art, the technique proposing a kind of bloom strand hot delivery and hot charging, hot delivery and hot charging process is stable smoothly, and cc billet surface quality is good, and surface occurs without hot cracks, rolled steel performance meets user's requirement, improving yield, reduce energy consumption, conevying efficiency is high.
In order to solve above-mentioned technical problem, the technical scheme is that and be accomplished by: the technique of a kind of bloom strand hot delivery and hot charging, this technique sequentially includes the following steps:
Step one: enter at strand and need to add thermal insulation cover on the roller-way before withdrawal straightening machine, go out withdrawal straightening machine to fire cut between roller-way need to add thermal insulation cover and be incubated；When needing first to confirm power house ventilation situation wind condition before strand entrucking, need first to close the doors and windows, convection current wind must not be had to occur in hot charging region；
Step 2: when, after strand to cold bed, the thermal car of transport strand must arrive entrucking position in advance, and thermal car must have fire resistant heat preserving ability；Then carrying out preliminary quality monitoring, first cohesive process equipment running monitoring and scene, at X-ray inspection X, are chosen in time to producing abnormal strand, according to technological requirement, sentence useless online or enter to cheat slow cooling and process；
Step 3: quickly collect strand, before entrucking, casting blank surface temperature is at 555-625 DEG C, every three strands are sling together, lift in the thermal insulation cover to thermal car, close the most rapidly thermal insulation cover, treat that next lifts fashionable opening, use a car one heat steel to transport, after thermal insulation cover on thermal car is closed, strand is enclosed in the thermal insulation cover on thermal car completely；
Step 4: thermal car transports, after strand entrucking, at once delivers to steel rolling mill and waits that, into heating furnace, running time is less than 50min；To steel rolling mill, unloading in time, load heating furnace, before loading heating furnace, casting blank surface temperature must be more than 450 DEG C, and the shove charge time of simultaneously unloading does not surpasses 60min.
So, pass through technical scheme, thermal insulation cover is added on roller-way before withdrawal straightening machine, go out withdrawal straightening machine to fire cut between roller-way add thermal insulation cover and be incubated, effectively strand is incubated, reduce thermal loss, the condition providing strong is sent for hot charging and heat, during entrucking, first carrying out closes the doors and windows avoids convection current wind to occur, so avoiding the immediate loss of strand heat, reduce casting billet surface oxidation rate, during quickly collecting strand, entrucking temperature is in 555-625 DEG C of interval, this temperature is most stable of casting blank surface temperature, when some steel grades are carried out hot delivery and hot charging, when temperature is less than 555 DEG C, surface defect usually occurs, especially in the winter that ambient temperature is low；Defect occurs with intercrystalline crack form, and batch triangular shape crackle occurs in stocking surface.It is relevant in austenite grain boundary precipitation with AlN or VCN, NbCN, AlN speed of separating out in austenite is the slowest, when austenite is after ferritic transformation starts, speed is greatly improved, major part AlN is that speed of separating out is maximum when about 600～900 DEG C, and actual temperature range depends on carbon content and alloying element content.When AlN separates out, tiny AlN concentrates on γ crystal boundary, prevents the movement of crystal boundary in Formed During Metal Hot Deformation, and mechanical stress is assembled in grain boundary, when stress value exceedes affinity between crystal grain, just creates grain-boundary crack.In strand cooling procedure after solidification, C, N compound can be occurred to separate out in austenite grain boundary, weaken crystal boundary energy, cause A → F phase transformation, volumetric expansion exacerbates weakening of grain-boundary strength, will extend formation face crack when rolling.
All C content carbon steel below 0.3% and C-Mn steel, all surface hardening steel, and many have the steel alloy of fine grained texture, and quiet steel all there will be hot-short phenomenon, particularly containing remaining and that impurity element is higher electric steel.
Strand enters the temperature before heating furnace and is less than 450 DEG C, then can not meet the condition of hot-loading and hot-conveying, if pressing hot-loading and hot-conveying technique to perform heating operation, the tapping temperature of blank cannot meet rolling demand.
Detailed description of the invention
The present invention is described in further detail below:
Embodiment 1
The technique of a kind of bloom strand hot delivery and hot charging that the present embodiment provides, this technique sequentially includes the following steps:
Step one: enter at strand and need to add thermal insulation cover on the roller-way before withdrawal straightening machine, go out withdrawal straightening machine to fire cut between roller-way need to add thermal insulation cover and be incubated；When needing first to confirm power house ventilation situation before strand entrucking, need first to close the doors and windows, convection current wind must not be had to occur in hot charging region；
Step 2: when, after strand to cold bed, the thermal car of transport strand must arrive entrucking position in advance, and thermal car must have fire resistant heat preserving ability；Then carrying out preliminary quality monitoring, first cohesive process equipment running monitoring and scene, at X-ray inspection X, are chosen in time to producing abnormal strand, according to technological requirement, sentence useless online or enter to cheat slow cooling and process；
Step 3: quickly collect strand, before entrucking, casting blank surface temperature is at 555-625 DEG C, every three strands are sling together, lift in the thermal insulation cover to thermal car, close the most rapidly thermal insulation cover, treat that next lifts fashionable opening, use a car one heat steel to transport, after thermal insulation cover on thermal car is closed, strand is enclosed in the thermal insulation cover on thermal car completely；
Step 4: thermal car transports, after strand entrucking, at once delivers to steel rolling mill and waits that, into heating furnace, running time is less than 50min；To steel rolling mill, unloading in time, load heating furnace, before loading heating furnace, casting blank surface temperature must be more than 450 DEG C, and the shove charge time of simultaneously unloading does not surpasses 60min.
Embodiment 2
The technique of a kind of bloom strand hot delivery and hot charging that the present embodiment provides, this technique sequentially includes the following steps:
Step one: enter at strand and need to add thermal insulation cover on the roller-way before withdrawal straightening machine, go out withdrawal straightening machine to fire cut between roller-way need to add thermal insulation cover and be incubated；When needing first to confirm power house ventilation situation before strand entrucking, need first to close the doors and windows, convection current wind must not be had to occur in hot charging region；
Step 2: when, after strand to cold bed, the thermal car of transport strand must arrive entrucking position in advance, and thermal car must have fire resistant heat preserving ability；Then carrying out preliminary quality monitoring, first cohesive process equipment running monitoring and scene, at X-ray inspection X, are chosen in time to producing abnormal strand, according to technological requirement, sentence useless online or enter to cheat slow cooling and process；
Step 3: quickly collect strand, before entrucking, casting blank surface temperature is at 555-600 DEG C, every three strands are sling together, lift in the thermal insulation cover to thermal car, close the most rapidly thermal insulation cover, treat that next lifts fashionable opening, use a car one heat steel to transport, after thermal insulation cover on thermal car is closed, strand is enclosed in the thermal insulation cover on thermal car completely；
Step 4: thermal car transports, after strand entrucking, at once delivers to steel rolling mill and waits that, into heating furnace, running time is less than 40min；To steel rolling mill, unloading in time, load heating furnace, before loading heating furnace, casting blank surface temperature must be more than 460 DEG C, and the shove charge time of simultaneously unloading does not surpasses 55min.
Embodiment 3
The technique of a kind of bloom strand hot delivery and hot charging that the present embodiment provides, this technique sequentially includes the following steps:
Step one: enter at strand and need to add thermal insulation cover on the roller-way before withdrawal straightening machine, go out withdrawal straightening machine to fire cut between roller-way need to add thermal insulation cover and be incubated；When needing first to confirm power house ventilation situation before strand entrucking, need first to close the doors and windows, convection current wind must not be had to occur in hot charging region；
Step 2: when, after strand to cold bed, the thermal car of transport strand must arrive entrucking position in advance, and thermal car must have fire resistant heat preserving ability；Then carrying out preliminary quality monitoring, first cohesive process equipment running monitoring and scene, at X-ray inspection X, are chosen in time to producing abnormal strand, according to technological requirement, sentence useless online or enter to cheat slow cooling and process；
Step 3: quickly collect strand, before entrucking, casting blank surface temperature is at 580-620 DEG C, every three strands are sling together, lift in the thermal insulation cover to thermal car, close the most rapidly thermal insulation cover, treat that next lifts fashionable opening, use a car one heat steel to transport, after thermal insulation cover on thermal car is closed, strand is enclosed in the thermal insulation cover on thermal car completely；
Step 4: thermal car transports, after strand entrucking, at once delivers to steel rolling mill and waits that, into heating furnace, running time is less than 45min；To steel rolling mill, unloading in time, load heating furnace, before loading heating furnace, casting blank surface temperature must be more than 480 DEG C, and the shove charge time of simultaneously unloading does not surpasses 50min.
Above example is only the technological thought that the present invention is described, it is impossible to limiting protection scope of the present invention with this, every technological thought proposed according to the present invention, any change done on the basis of technical scheme, within each falling within scope.
Claims (3)
1. the technique of a bloom strand hot delivery and hot charging, it is characterised in that: this technique sequentially includes the following steps:
Step one: enter at strand and need to add thermal insulation cover on the roller-way before withdrawal straightening machine, go out withdrawal straightening machine to fire cut between roller-way need to add thermal insulation cover and be incubated；When needing first to confirm power house ventilation situation wind condition before strand entrucking, need first to close the doors and windows, convection current wind must not be had to occur in hot charging region；
Step 2: when, after strand to cold bed, the thermal car of transport strand must arrive entrucking position in advance, and thermal car must have fire resistant heat preserving ability；Then carrying out preliminary quality monitoring, first cohesive process equipment running monitoring and scene, at X-ray inspection X, are chosen in time to producing abnormal strand, according to technological requirement, sentence useless online or enter to cheat slow cooling and process；
Step 3: quickly collect strand, before entrucking, casting blank surface temperature is at 555-625 DEG C, every three strands are sling together, lift in the thermal insulation cover to thermal car, close the most rapidly thermal insulation cover, treat that next lifts fashionable opening, use a car one heat steel to transport, after thermal insulation cover on thermal car is closed, strand is enclosed in the thermal insulation cover on thermal car completely；
Step 4: thermal car transports, after strand entrucking, at once delivers to steel rolling mill and waits that, into heating furnace, running time is less than 50min；To steel rolling mill, unloading in time, load heating furnace, before loading heating furnace, casting blank surface temperature must be more than 450 DEG C, and the shove charge time of simultaneously unloading does not surpasses 60min.
The technique of bloom strand hot delivery and hot charging the most according to claim 1, this technique sequentially includes the following steps:
Step one: enter at strand and need to add thermal insulation cover on the roller-way before withdrawal straightening machine, go out withdrawal straightening machine to fire cut between roller-way need to add thermal insulation cover and be incubated；When needing first to confirm power house ventilation situation before strand entrucking, need first to close the doors and windows, convection current wind must not be had to occur in hot charging region；
Step 2: when, after strand to cold bed, the thermal car of transport strand must arrive entrucking position in advance, and thermal car must have fire resistant heat preserving ability；Then carrying out preliminary quality monitoring, first cohesive process equipment running monitoring and scene, at X-ray inspection X, are chosen in time to producing abnormal strand, according to technological requirement, sentence useless online or enter to cheat slow cooling and process；
Step 3: quickly collect strand, before entrucking, casting blank surface temperature is at 555-600 DEG C, every three strands are sling together, lift in the thermal insulation cover to thermal car, close the most rapidly thermal insulation cover, treat that next lifts fashionable opening, use a car one heat steel to transport, after thermal insulation cover on thermal car is closed, strand is enclosed in the thermal insulation cover on thermal car completely；
Step 4: thermal car transports, after strand entrucking, at once delivers to steel rolling mill and waits that, into heating furnace, running time is less than 40min；To steel rolling mill, unloading in time, load heating furnace, before loading heating furnace, casting blank surface temperature must be more than 460 DEG C, and the shove charge time of simultaneously unloading does not surpasses 55min.
The technique of bloom strand hot delivery and hot charging the most according to claim 1, this technique sequentially includes the following steps:
Step one: enter at strand and need to add thermal insulation cover on the roller-way before withdrawal straightening machine, go out withdrawal straightening machine to fire cut between roller-way need to add thermal insulation cover and be incubated；When needing first to confirm power house ventilation situation before strand entrucking, need first to close the doors and windows, convection current wind must not be had to occur in hot charging region；
Step 2: when, after strand to cold bed, the thermal car of transport strand must arrive entrucking position in advance, and thermal car must have fire resistant heat preserving ability；Then carrying out preliminary quality monitoring, first cohesive process equipment running monitoring and scene, at X-ray inspection X, are chosen in time to producing abnormal strand, according to technological requirement, sentence useless online or enter to cheat slow cooling and process；
Step 3: quickly collect strand, before entrucking, casting blank surface temperature is at 580-620 DEG C, every three strands are sling together, lift in the thermal insulation cover to thermal car, close the most rapidly thermal insulation cover, treat that next lifts fashionable opening, use a car one heat steel to transport, after thermal insulation cover on thermal car is closed, strand is enclosed in the thermal insulation cover on thermal car completely；
Step 4: thermal car transports, after strand entrucking, at once delivers to steel rolling mill and waits that, into heating furnace, running time is less than 45min；To steel rolling mill, unloading in time, load heating furnace, before loading heating furnace, casting blank surface temperature must be more than 480 DEG C, and the shove charge time of simultaneously unloading does not surpasses 50min.
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Cited By (5)
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| CN111809028A (en) * | 2019-04-11 | 2020-10-23 | 上海梅山钢铁股份有限公司 | Heating process for avoiding surface defects of steel plate |
| CN113399469A (en) * | 2021-06-23 | 2021-09-17 | 新疆八一钢铁股份有限公司 | Abnormal slab handling method for improving hot charging and hot delivery rate |
| CN113649537A (en) * | 2021-07-05 | 2021-11-16 | 包头钢铁（集团）有限责任公司 | Hot charging and hot conveying method for wide and thick plate blank |
| CN114309514A (en) * | 2022-01-06 | 2022-04-12 | 宝武集团鄂城钢铁有限公司 | System and method for hot feeding and hot charging integrated production of continuous casting steel billet |
| CN115069998A (en) * | 2022-07-03 | 2022-09-20 | 新疆八一钢铁股份有限公司 | Heat-preservation hot charging method for steel rolling medium plate blank |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115069998A (en) * | 2022-07-03 | 2022-09-20 | 新疆八一钢铁股份有限公司 | Heat-preservation hot charging method for steel rolling medium plate blank |
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