CN106148673B - A kind of high-carbon steel high-temperature heating diffusion control method - Google Patents
A kind of high-carbon steel high-temperature heating diffusion control method Download PDFInfo
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- CN106148673B CN106148673B CN201510198750.9A CN201510198750A CN106148673B CN 106148673 B CN106148673 B CN 106148673B CN 201510198750 A CN201510198750 A CN 201510198750A CN 106148673 B CN106148673 B CN 106148673B
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Abstract
The present invention relates to a kind of high-carbon steel to be heated at high temperature diffusion control method, the control method is according to the parameter information of steel billet, the initial temperature distribution of steel billet and initial carbon concentration distribution is calculated, and it is distributed according to the initial carbon concentration distribution and initial temperature, by computer model, dynamic calculates the Current Temperatures distribution of steel billet in high temperature furnace and current carbon content distribution, so as to more accurately determine the high-temperature heating diffusion end time of high-carbon steel carbon, ensure product quality, energy saving consumption.Heating time can not be accurately controlled by solving existing high-carbon steel high-temperature heating diffusion, it is impossible to while meet the problem of product quality requires and is energy saving.
Description
Technical field
The present invention relates to the processing and forming of technical field of metallurgical production, particularly hot-rolled steel, specifically a kind of high-carbon steel is high
Temperature heating diffusion control method.
Background technology
The carbon component segregation of high-carbon steel is one and is difficult to the technical barrier being fully solved by the steel-making continuous casting stage, steel billet or
Person's steel ingot uneven chemical components, to machining, being heat-treated, drawing stability and other application performance bring adverse effect.Mesh
Before, many high-grade steel still need to mitigate by High temperature diffusion or eliminate dendritic segregation.The general side used
Method is：Strand, either steel ingot is placed in heating furnace or soaking pit, and then carrying out heating according to given process curve rises
Temperature, heat preservation, so as to fulfill High temperature diffusion.
It is heating temperature and soaking time to be heated at high temperature most important two parameters of diffusion technique.Regrettably, it is high at present
The formulation of warm diffusion technique parameter lacks effective reference standard without reliable theoretical foundation.For the steel of different materials
Ingot, different supplied materials sizes etc., high-temperature diffusion process parameter should have difference and specific aim.However, existing technics comparing cage
System is that examination is gathered by rule of thumb mostly, caused as a result, in some cases, disclosure satisfy that quality requirement, but may be due to heat preservation when
Between it is long so that crystal grain is excessively coarse and causes energy huge waste；And in some cases, since soaking time falls short of, nothing
Method reaches a high temperature the purpose of diffusion, consumes the valuable energy in vain.
Since high-temperature heating diffusion is at a high temperature of 1200 degree or more, a few hours are kept the temperature, energy-output ratio is very big, oxygen
It is also very serious to change scaling loss.At present, steel and iron industry comes into low margin age, each iron and steel enterprise all pay special attention to product quality and
Energy consumption.The steel grade of High temperature diffusion is needed, the energy consumption in heating process accounts for the energy total amount of entire production process
More than 80%, therefore, how most preferably to control the heating process of High temperature diffusion, under the premise of product quality is ensured, as possible
Reducing the consumption of fuel is very important.For the heating process of Optimal Control High temperature diffusion, it is desirable to provide a kind of technology
Means, according to different steel grades, different steel billet geometric dimensions, dynamic judges the effect of High temperature diffusion, accurately to determine
The time that high-temperature heating diffusion terminates.
For the solution of this problem, domestic main patent and document are as follows：
《External metal heat treatmet》4th phase in 1998,《Effect of the carbon spread model in process deviation amendment》One text, will
Carbon spread model is successfully used in the carburizing heat treatment of steel, using showing：The model is relatively suitble to Deep Carburization Process.However, in order to
Carbon segregation is eliminated, high-carbon steel needs High temperature diffusion, this high-temperature physics process and carburizing are entirely different, so, this method
Occasion as high-carbon steel High temperature diffusion cannot be expanded to needs a kind of new technological means.
Heating furnace Application Number (patent)：CN200910012026.7；Denomination of invention：A kind of reduction carbon segregation in high-carbon steel
Method.A kind of method for reducing carbon segregation in high-carbon steel of the disclosure of the invention.Invent the production technology that uses for：Steel-making → essence
Refining → continuous casting → heating stove heat → tandem rolling, it is characterised in that：When heating stove heat, heating time≤1.5 hour, soaking time
It it is >=2.0 hours, total time is≤3.5 hours, and tapping temperature is 1150 DEG C~1250 DEG C, and start rolling temperature is 1100 DEG C~1250
DEG C, finishing temperature >=900 DEG C.
The patent only gives the range of heating time, does not provide according to steel grade, billet bloom size, dynamic calculates steel billet
The situation that interior carbon segregation is diffused with temperature does not provide the control method of high-carbon steel High temperature diffusion end time yet.Therefore,
Also just it is difficult to realize the Optimal Control of high-carbon steel High temperature diffusion, it is also difficult to reach the requirement for not only meeting product quality, but also save energy
The purpose in source.
Invention content
The object of the present invention is to provide a kind of high-carbon steel to be heated at high temperature diffusion control method, and the control method passes through meter
Calculation machine model dynamic calculates the Temperature Distribution and carbon content distribution of steel billet in high temperature furnace, so as to which the height of high-carbon steel carbon be best determined
The temperature heating diffusion end time, it is ensured that product quality, energy saving consumption.To solve existing high-carbon steel high-temperature heating diffusion
Heating time can not be accurately controlled, it is impossible to while meet the problem of product quality requires and is energy saving.
To achieve the above object, the scheme of the invention is：A kind of high-carbon steel high-temperature heating diffusion control method, the height
Carbon steel high-temperature heating diffusion control method includes the following steps：
(1) the target temperature deviation of steel billet and target concentration of carbon deviation are set, the parameter information of steel billet is obtained, according to described
Parameter information calculate steel billet initial temperature distribution and initial carbon concentration distribution；
(2) in-furnace temperature is obtained, according to the radiation coefficient in the physical parameter and high temperature furnace of steel billet, is calculated with step (1)
The initial temperature of steel billet be distributed as starting point, using the equation of heat conduction, calculate the Current Temperatures distribution of steel billet；
(3) the Current Temperatures distribution of the steel billet obtained according to step (2), it is dense with the initial carbon of steel billet that step (1) calculates
Degree is distributed as starting point, according to Carbon diffusion activation energy and diffusion coefficient in steel billet, using diffusion equation, calculates the current carbon of steel billet
Concentration distribution；
(4) according to the distribution of the Current Temperatures of the steel billet and carbon content distribution, the maximum temperature deviation △ T of steel billet are calculatedact
With maximum concentration of carbon deviation △ Cact, and and setting target temperature deviation △ TaimWith target concentration of carbon deviation △ CaimCompared
Compared with if △ TactLess than or equal to △ Taim, and △ CactLess than or equal to △ Caim, then the heating quality of steel billet meet technique will
It asks, high-temperature heating diffusion terminates；Otherwise, initial temperature distribution and the carbon content distribution of steel billet, weight are calculated again according to step (1)
High-temperature heating diffusion newly is carried out to steel billet.
High-carbon steel according to the present invention, which is heated at high temperature, spreads control method, in the step (1), the steel billet
Parameter information includes billet bloom size, steel billet thermal conductivity factor, steel billet specific heat, steel billet density, Carbon diffusion activation energy and diffusion coefficient.
High-carbon steel according to the present invention, which is heated at high temperature, spreads control method, in the step (1), if for the first time
It calculates, then the practical surface temperature measured when the initial temperature distribution of steel billet is set as billet-charging, i.e.,：Steel billet
Initial carbon concentration distribution is set as examining before billet-charging the steel billet carbon content distribution of acquisition, i.e.,：
Wherein, TsufThe surface temperature measured when being billet-charging；
It is the carbon content distribution that acquisition is examined before billet-charging；
For the last Current Temperatures distribution for calculating the steel billet obtained；
For the last current carbon content distribution for calculating the steel billet obtained；
I is the serial number of steel billet thickness direction grid, and N is maximum mesh number.
High-carbon steel according to the present invention, which is heated at high temperature, spreads control method, in the step (2), the steel billet
Current Temperatures are distributed, and are calculated using conventional difference method, solve the equation of heat conduction, and the expression-form of the equation of heat conduction is as follows：
Wherein, QtopUpper surface hot-fluid for steel billet；
QdownFor steel billet lower surface hot-fluid；
A is temperature diffusivity；
λ is thermal conductivity factor；
εtop∈ (0,1) is high temperature furnace internal upper part radiation coefficient；
σ is Boltzmann constant；
For top furnace gas temperature；
TNFor steel billet upper surface temperature；
εdown∈ (0,1) is lower radiant coefficient in high temperature furnace；
For top furnace gas temperature；
T1For steel billet underlaying surface temperature.
High-carbon steel according to the present invention, which is heated at high temperature, spreads control method, in the step (3), the diffusion
The expression-form of equation is as follows：
D=D0exp(-Q/RT)
Wherein, D is diffusion coefficient；
Q is diffusion activation energy, and unit is J/mol；
R is gas constant；
T is the temperature of each layer grid of steel billet thickness direction obtained by step 2；
D0For diffusion constant；
C0(x) it is distributed for the initial carbon concentration of steel billet；
C (x, 0) is the current carbon content distribution of steel billet.
High-carbon steel according to the present invention, which is heated at high temperature, spreads control method, in the step (4), the maximum
Concentration of carbon deviation △ Cact, it is steel billet upper surface concentration of carbon, lower surface concentration of carbon and the center concentration of carbon obtained according to step (3),
The absolute value of the difference of upper surface concentration of carbon and center concentration of carbon and the difference of lower surface concentration of carbon and center concentration of carbon is first obtained
Absolute value, then using the maximum value in two absolute values as concentration of carbon deviation △ CactI.e.：
△Cact=max { △ c1,△c2}
△c1=| Ccenter-C1|, △ c2=| Ccenter-CN|
Wherein, △ c1The absolute value of the difference of lower surface concentration of carbon and center concentration of carbon for steel billet；
△c2The absolute value of the difference of upper surface concentration of carbon and center concentration of carbon for steel billet；
Ccenter、C1、CNRespectively steel billet center concentration of carbon, lower surface concentration of carbon and upper surface concentration of carbon.
High-carbon steel according to the present invention, which is heated at high temperature, spreads control method, in the step (4), the maximum
Temperature deviation △ Tact, it is steel billet upper surface temperature, underlaying surface temperature and the central temperature obtained according to step (2), is first obtained
The absolute value of the difference and steel billet underlaying surface temperature and the absolute value of the difference of central temperature of surface temperature and central temperature, then
Using the maximum value of two absolute values as maximum temperature deviation △ Tact, i.e.,：
△Tact=max { △ T1,△T2}
△T1=| Tcenter-T1|, △ T2=| Tcenter-TN|
Wherein, △ T1For the underlaying surface temperature of steel billet and the absolute value of the difference of central temperature；△T2Upper surface temperature for steel billet
Degree and the absolute value of the difference of central temperature；Tcenter、T1、TNThe respectively central temperature of steel billet, underlaying surface temperature and upper surface temperature
Degree.
The advantageous effect that the present invention reaches：The control method of the present invention, which can be realized, is heated at high temperature in diffusion process high-carbon steel
Temperature Distribution, carbon content distribution, which change with time, to be monitored, and is referred to according to temperature uniformity index and concentration of carbon uniformity
The end time of high-temperature heating diffusion is determined more accurately in mark.Steel billet in high temperature furnace is calculated by computer model dynamic
Temperature Distribution and carbon content distribution, so as to which the high-temperature heating of the high-carbon steel carbon diffusion end time be best determined, it is ensured that product matter
Amount, energy saving consumption.
Description of the drawings
Fig. 1 is the control flow chart of the present invention；
The network that Fig. 2 is the present invention divides schematic diagram；
Fig. 3 is the heating process heating curve schematic diagram of the present invention；
Fig. 4 is the carbon content distribution curve synoptic diagram of the present invention.
Specific embodiment
The invention will now be described in further detail with reference to the accompanying drawings.
As shown in Figure 1, the detailed process of control method of the present invention is as follows：
Step 1, the relevant parameter information of steel billet is obtained, according to the parameter information, calculates the initial temperature point of steel billet
Cloth and carbon content distribution.
If first calculate, then equidistant mesh generation, the initial temperature point of steel billet are carried out to steel billet thickness direction
The practical surface temperature measured when cloth is shove charge, i.e.,：The initial carbon concentration of steel billet is distributed as dress foundry test and obtains
The steel billet carbon content distribution obtained, i.e.,：
It is calculated if not first, then the initial temperature of steel billet is distributed as the last steel billet Current Temperatures point for calculating and obtaining
Cloth, i.e.,：The initial carbon concentration of steel billet is distributed as the last current carbon content distribution of steel billet for calculating and obtaining, i.e.,：
Wherein,Initial temperature for steel billet is distributed；
TsufThe surface temperature measured when being billet-charging；
The steel billet Current Temperatures obtained distribution is calculated to be last；
The current carbon content distribution of steel billet obtained is calculated to be last；
It is the initial carbon concentration distribution of steel billet；
It is the carbon content distribution that acquisition is examined before billet-charging；
I is the serial number of steel billet thickness direction grid, and i=1,2,3.....N, N are maximum mesh numbers, the signal of mesh generation
Figure is shown in Fig. 2, and along steel billet thickness direction, to upper surface since steel billet lower surface, steel billet thickness is divided into i=1,2,3...N
Layer, i=1 are first layer, that is, lower surface, and i=N is last layer, i.e. upper surface.
Step 2, obtain in-furnace temperature, according to the physical parameter and radiation coefficient of steel billet, the steel billet that is obtained with step 1 just
Beginning Temperature Distribution is starting point, using the equation of heat conduction, calculates the Current Temperatures distribution of steel billet.
The expression-form of the equation of heat conduction is as follows：
Wherein, QtopUpper surface hot-fluid for steel billet；
QdownFor steel billet lower surface hot-fluid；
A is temperature diffusivity；
λ is thermal conductivity factor；
εtop∈ (0,1) is high temperature furnace internal upper part radiation coefficient；
σ is Boltzmann constant；
For top furnace gas temperature；
TNFor steel billet upper surface temperature；
εdown∈ (0,1) is lower radiant coefficient in high temperature furnace；
For top furnace gas temperature；
T1For steel billet underlaying surface temperature.
Step 3, according to the result of calculation of step 2, the initial carbon concentration of the steel billet obtained with step 1 is distributed as starting point, root
According to the diffusion activation energy and diffusion coefficient of steel billet, using diffusion equation, the current carbon content distribution of steel billet is calculated.
The expression-form of the diffusion equation is as follows：
D=D0exp(-Q/RT)
Wherein, D is diffusion coefficient；Q is diffusion activation energy, and unit is J/mol；R is gas constant；D0For diffusion constant；T
The temperature of each layer grid of steel billet thickness direction to be obtained by step 2；C0(x) it is distributed for the initial carbon concentration of steel billet；C(x,0)
Current carbon content distribution for steel billet.
Step 4, the result of calculation obtained according to step 2 and step 3 calculates the maximum temperature deviation △ T of steel billetactMost
Big concentration of carbon deviation △ Cact, and the maximum temperature deviation △ T that will be calculatedactWith maximum concentration of carbon deviation △ CactWith setting
Target temperature deviation △ TaimWith target concentration of carbon deviation △ CaimIt is compared, if △ TactLess than or equal to △ Taim, and
△CactLess than or equal to △ Caim, then the heating quality of steel billet, meets technological requirement, and High temperature diffusion terminates；Otherwise, step is continued to execute
Rapid 1.
The maximum temperature deviation △ T of the steel billetact, be the steel billet upper surface obtained according to step 2, lower surface and in
The underlaying surface temperature of the upper surface temperature of steel billet and the absolute value of the difference of central temperature and steel billet is first obtained in heart temperature
Then maximum temperature deviation △ T of the maximum value as steel billet of two absolute values is obtained in the absolute value of heart temperature differenceact, expression
Formula is：
△Tact=max { △ T1,△T2}
△T1=| Tcenter-T1|, △ T2=| Tcenter-TN|
Wherein, Tcenter、T1、TNRespectively step 2 calculates steel billet central temperature, underlaying surface temperature and the upper surface temperature obtained
Degree.
The maximum concentration of carbon deviation △ Cact, be the upper surface of the steel billet obtained according to step 3, lower surface and in
The absolute value of the difference of upper surface concentration of carbon and center concentration of carbon and lower surface concentration of carbon and center carbon is first obtained in heart concentration of carbon
Then maximum concentration of carbon deviation △ C of the maximum value in two absolute values as steel billet is obtained in the absolute value of the difference of concentrationact, table
It is up to formula：
△Cact=max { △ c1,△c2}
△c1=| Ccenter-C1|, △ c2=| Ccenter-CN|
Wherein Ccenter、C1、CNCenter concentration of carbon, lower surface concentration of carbon and the upper surface of the steel billet obtained are calculated for step 3
Concentration of carbon.
By technical scheme of the present invention, can realize dense to Temperature Distribution, carbon in high-carbon steel high-temperature heating diffusion process
Degree distribution, which changes with time, to be monitored, and then, according to temperature uniformity index and concentration of carbon uniformity index, determines high temperature
Heat the end time of diffusion.The Temperature Distribution and carbon content distribution of steel billet in high temperature furnace are calculated by computer model dynamic,
So as to which the high-temperature heating of the high-carbon steel carbon diffusion end time be best determined, it is ensured that product quality, energy saving consumption.
Embodiment：
Below by taking Gr15 bearing steels, steel billet thickness 300mm as an example, the control method of the present invention, Gr15 bearings is discussed in detail
Steel steel billet enters soaking pit and carries out high-temperature heating diffusion, after meeting technological temperature requirement and diffusing qualities requirement, terminates heating, into
Capable rolling of coming out of the stove, specific implementation process are as follows：
Control method according to the present invention first, in accordance with step 1, obtains the relevant parameter information of steel billet, calculates steel billet
Initial temperature is distributed and initial carbon concentration distribution.
It is as follows that high-temperature heating diffusion heating temperature in stove changes over time situation：
| Technical process | 800 DEG C of heat preservations | At the uniform velocity heat up | 1100 DEG C of heat preservations | At the uniform velocity heat up | 1240 DEG C of heat preservations |
| Time h | 3 | 2 | 2 | 1.5 | >=2 |
For non-first time calculated case, I=1,2,3,4,5.Wherein TsufIt is steel billet dress
The surface temperature measured during stove；It is the carbon content distribution that acquisition is examined before billet-charging. Respectively last meter
Calculate the Current Temperatures distribution of the steel billet obtained and current carbon content distribution；I is the serial number of steel billet thickness direction grid, and N=5 is most
Big grid number, the schematic diagram of mesh generation are shown in Fig. 2.
According to step 2, the temperature of thermocouple in high temperature furnace is obtained, different moments electric thermo-couple temperature and corresponding moment in this example
Technological temperature it is identical, according to the physical parameter and radiation coefficient of steel billet, take the radiation coefficient on the upper and lower surface of steel billet here
εtop、εdownRespectively 0.85,0.65.The steel billet initial temperature provided with step 1 is distributed as starting point, using the equation of heat conduction, meter
Calculate the Current Temperatures distribution of steel billet.The Temperature Distribution for calculating steel billet, using conventional difference method, described in solution procedure 2
The equation of heat conduction.Heating process heating curve is as shown in Figure 3.
According to step 3, the Current Temperatures distribution of calculating is inputted as the temperature of diffusion coefficient, present case takes diffusion constant
For 0.13cm2/ s, diffusion activation energy 34884cal/mol, and using the current carbon content distribution of steel billet that step 1 provides as rise
Point according to the diffusion activation energy and diffusion coefficient of steel billet, using diffusion equation, calculates the current carbon content distribution of steel billet.It is described
The current carbon content distribution of steel billet is calculated, using conventional difference method, solves the diffusion equation that step 3 of the present invention provides.Carbon
The final result of calculation of concentration distribution is as shown in Figure 4.
It according to step 4, is distributed according to the current carbon content distribution and Current Temperatures being calculated, calculates the maximum of steel billet
Temperature deviation △ TactWith the concentration of carbon deviation △ C for calculating maximumact, and and the given target temperature deviation △ T of techniqueaim=10
With concentration of carbon deviation △ Caim=0.05 is compared, if △ TactLess than or equal to △ Taim, and △ CactLess than or equal to △
Caim, then the heating quality of steel billet, meets technological requirement, and High temperature diffusion terminates；Otherwise, step 1 is re-executed.
According to fig. 3 with the final calculation result of Fig. 4, in heating process time 550min, △ Tact≤10；In heater
During skill time 600min, △ Cact≤0.05.Therefore, in heating process time 600min, meet △ TactLess than or equal to △
Taim, and △ CactLess than or equal to △ Caim；It is therefore possible to control steel billet High temperature diffusion heating process terminates, carry out tapping and roll
System.
According to the method for the present invention, it can be achieved that high-carbon steel be heated at high temperature diffusion process in Temperature Distribution, carbon content distribution with
The variation of time is monitored, and then, according to temperature uniformity index and concentration of carbon uniformity index, determines high-temperature heating diffusion
End time.The Temperature Distribution and carbon content distribution of steel billet in high temperature furnace are calculated by computer model dynamic, so as to best
Ground determines the high-temperature heating end time of high-carbon steel carbon, it is ensured that product quality, energy saving consumption.
Claims (6)
- A kind of 1. high-carbon steel high-temperature heating diffusion control method, it is characterised in that the high-carbon steel high-temperature heating diffusion controlling party Method includes the following steps：(1) the target temperature deviation of steel billet and target concentration of carbon deviation are set, the parameter information of steel billet is obtained, according to the ginseng Number information calculates the initial temperature distribution of steel billet and initial carbon concentration distribution, and the initial temperature distribution of the steel billet is set as steel billet The practical surface temperature measured during shove charge, the initial carbon concentration distribution of the steel billet are set as examining before billet-charging the steel of acquisition Base concentration of carbon；(2) in-furnace temperature is obtained, according to the radiation coefficient in the physical parameter and high temperature furnace of steel billet, the steel calculated with step (1) The initial temperature of base is distributed as starting point, using the equation of heat conduction, calculates the Current Temperatures distribution of steel billet；(3) the Current Temperatures distribution of the steel billet obtained according to step (2), the initial carbon concentration of steel billet point calculated with step (1) Cloth is starting point, according to Carbon diffusion activation energy and diffusion coefficient in steel billet, using diffusion equation, calculates the current concentration of carbon of steel billet Distribution；(4) according to the distribution of the Current Temperatures of the steel billet and carbon content distribution, the maximum temperature deviation delta T of steel billet is calculatedactMost Big concentration of carbon deviation delta Cact, and with the target temperature deviation delta T of settingaimWith target concentration of carbon deviation delta CaimIt is compared, such as Fruit Δ TactLess than or equal to Δ Taim, and Δ CactLess than or equal to Δ Caim, then the heating quality of steel billet meet technological requirement, high temperature Heating diffusion terminates；Otherwise, it is the initial temperature distribution of the distribution of the Current Temperatures of steel billet and current carbon content distribution as steel billet and initial carbon is dense Degree distribution continues to carry out steel billet high-temperature heating diffusion control.
- 2. high-carbon steel high-temperature heating diffusion control method according to claim 1, which is characterized in that the step (1) In, the steel billet parameter information includes billet bloom size, steel billet thermal conductivity factor, steel billet specific heat, steel billet density, Carbon diffusion activation Energy and diffusion coefficient.
- 3. high-carbon steel high-temperature heating diffusion control method according to claim 1, which is characterized in that the step (2) In, the expression-form of the equation of heat conduction is as follows：Wherein, QtopUpper surface hot-fluid for steel billet；QdownFor steel billet lower surface hot-fluid；A is temperature diffusivity；λ is thermal conductivity factor；εtop∈ (0,1) is high temperature furnace internal upper part radiation coefficient；σ is Boltzmann constant；For top furnace gas temperature；TNFor steel billet upper surface temperature；εdown∈ (0,1) is lower radiant coefficient in high temperature furnace；For top furnace gas temperature；T1For steel billet underlaying surface temperature；Ti startInitial temperature for steel billet is distributed.
- 4. high-carbon steel high-temperature heating diffusion control method according to claim 1, which is characterized in that the step (3) In, the expression-form of the diffusion equation is as follows：D=D0exp(-Q/RT)Wherein, D is diffusion coefficient；Q is diffusion activation energy, and unit is J/mol；R is gas constant；T is the temperature of each layer grid of steel billet thickness direction obtained by step 2；D0For diffusion constant；C0(x) it is distributed for the initial carbon concentration of steel billet；C (x, 0) is the current carbon content distribution of steel billet.
- 5. high-carbon steel high-temperature heating diffusion control method according to claim 1, which is characterized in that the step (4) In, the maximum concentration of carbon deviation delta Cact, it is steel billet upper surface concentration of carbon, the lower surface concentration of carbon obtained according to step (3) With center concentration of carbon, the absolute value of the difference of upper surface concentration of carbon and center concentration of carbon and lower surface concentration of carbon and center is first obtained The absolute value of the difference of concentration of carbon, then using the maximum value in two absolute values as maximum concentration of carbon deviation delta Cact, expression formula For：ΔCact=max { Δ c1,Δc2}Δc1=| Ccenter-C1|, Δ c2=| Ccenter-CN|Wherein, Δ c1The absolute value of the difference of lower surface concentration of carbon and center concentration of carbon for steel billet；Δc2The absolute value of the difference of upper surface concentration of carbon and center concentration of carbon for steel billet；Ccenter、C1、CNRespectively steel billet center concentration of carbon, lower surface concentration of carbon and upper surface concentration of carbon.
- 6. high-carbon steel high-temperature heating diffusion control method according to claim 1, which is characterized in that the step (4) In, the maximum temperature deviation delta Tact, it is steel billet upper surface temperature, underlaying surface temperature and the center obtained according to step (2) The absolute value of the difference of upper surface temperature and central temperature and the difference of steel billet underlaying surface temperature and central temperature is first obtained in temperature Absolute value, then using the maximum value of two absolute values as maximum temperature deviation delta Tact, expression formula is：ΔTact=max { Δ T1,ΔT2}ΔT1=| Tcenter-T1|, Δ T2=| Tcenter-TN|Wherein, Δ T1For the underlaying surface temperature of steel billet and the absolute value of the difference of central temperature；ΔT2The absolute value of the difference of upper surface temperature and central temperature for steel billet；Tcenter、T1、TNThe respectively central temperature of steel billet, underlaying surface temperature and upper surface temperature.
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| CN109136491B (en) * | 2017-06-28 | 2020-07-28 | 宝山钢铁股份有限公司 | Dynamic control method for niobium-containing steel heating process |
| CN109187610B (en) * | 2018-07-20 | 2022-03-18 | 中冶连铸技术工程有限责任公司 | Casting blank microstructure simulation method |
| CN109182731A (en) * | 2018-10-12 | 2019-01-11 | 宝钢特钢韶关有限公司 | A kind of high-carbon-chromium bearing steel continuous casting billet method for heating and controlling based on temperature-time control |
| CN111926159B (en) * | 2020-07-03 | 2022-09-23 | 邢台钢铁有限责任公司 | High-temperature diffusion heating method for reducing decarburization of bearing steel wire rod |
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|---|---|---|---|---|
| CN1431060A (en) * | 2002-01-11 | 2003-07-23 | 中国科学院金属研究所 | Method for predicting evolvement and performances of structure of strip steels in hot rolled proces |
| CN104070075A (en) * | 2014-06-04 | 2014-10-01 | 北京中冶设备研究设计总院有限公司 | Laminar cooling process control device and method for hot rolled strip steel |
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2015
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1431060A (en) * | 2002-01-11 | 2003-07-23 | 中国科学院金属研究所 | Method for predicting evolvement and performances of structure of strip steels in hot rolled proces |
| CN104070075A (en) * | 2014-06-04 | 2014-10-01 | 北京中冶设备研究设计总院有限公司 | Laminar cooling process control device and method for hot rolled strip steel |
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