CN103506405A - Method for compensating finish rolling gap during mixed stainless steel rolling - Google Patents
Method for compensating finish rolling gap during mixed stainless steel rolling Download PDFInfo
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Abstract
The invention provides a method for compensating a finish rolling gap during mixed stainless steel rolling. The method comprises the following steps of 1 determining a chemical component factor alpha of steel to be subjected to finish rolling and a chemical component factor alpha of a piece of previous finish rolling steel, and then determining a steel type compensation factor coff_alpha according to an alpha-alpha absolute value, wherein the steel type compensation factor coff_alpha is 0-0.6; 2 calculating a rolling gap compensation factor ksk_alpha according to the following formula ksk_alpha=(alpha-alpha1)*coff_alpha; 3 determining a bounce valve DH(I) of each finish rolling machine frame according to a stiffness curve during zeroing, wherein the I represents a number of a finishing mill frame; 4 determining a zero rolling gap S0(I) after zeroing, wherein the I represents the number of the finishing mill frame; 5 determining a rolling gap modification value KSK(I), wherein the I represents the number of the finishing mill frame; 6 determining a rolling gap value S(I) of each finishing mill according to the following formula S(I)=THEN(I+1)-DH(I)+S0(I)+KSK(I)+ksk_alpha, wherein the THEN(I+1) represents the outlet thickness of the I machine frame. By means of the method, specification change limitation of a hot continuous rolling product is effectively extended.
Description
Technical field
The present invention relates to the milling method of hot steel rolling production, especially thickness, pressure, the roll gap milling method of hot steel rolling production accurately.
Background technology
Hot continuous rolling process is a kind of mode of producing steel, is generally by continuous casting steel billet or plate slab and makes raw material.First slab heats according to the temperature of process stipulation at heating furnace, is heated to target temperature.Then slab, through high-pressure water descaling, then enters roughing mill, and roughing vertical roll is controlled width conventionally, and plain-barreled roll is controlled thickness.Rolling through roughing unit, makes to be with steel to reach predefined target thickness, width and temperature, is then with steel to enter mm finishing mill unit again and carries out continuous rolling, makes to be with steel to reach predefined target thickness, temperature.Finally by coiling machine, band steel is configured as to coil of strip.
It shown in Fig. 1, is existing hot continuous rolling process skeleton diagram.Equipment in this artwork comprises: heating furnace (4) 1, high-pressure water descaling case 2, rough rolling vertical roller mill (VE0) 3, roughing flat roll mill (R0) 4, stay-warm case 5, rotary drum crop flying shear 6, finishing stand (7 add frame) 7, profile gauge 8, width gage 9, calibrator 10, Straightness Meter 11, coiling machine 12.
Hot continuous rolling production line ageing equipment can cause equipment precision to reduce, main manifestations is that after each roll change, mm finishing mill unit is carried out acyclic homologically trioial, after acyclic homologically trioial, first of rolling steel thickness and precision is low, often occur exceeding the thickness deviation of customer requirements and cause waste product to occur, after acyclic homologically trioial, first steel rolling can not meet Product Precision requirement.
In addition, market competition causes the product structure of hot continuous rolling constantly to change, the frequent switching phenomenon that large span occurs between softwood matter steel and hard material steel, thin gauge strip and heavy gauge steel strip, when switching, first block of steel can not meet the requirement of Product Precision.
And, at stainless steel and carbon steel, mixing while rolling (two blocks of carbon steels of every rolling, with regard to stainless steel of rolling, this rolling unit is always by this rule scheduling rolling) rolling, stainless steel, carbon steel all can not meet Product Precision requirement.
Summary of the invention
Technical problem to be solved by this invention is: overcome the super tolerance of steel thickness and waste Phenomena that the stainless steel reinforced concrete of existing hot continuous rolling rolls, the milling method of hot steel rolling production is provided, for stainless steel reinforced concrete, roll and added roll gap compensation, effectively expanded the specifications vary restriction of hot steel rolling production.
In order to solve the problems of the technologies described above, the first technical scheme provided by the invention is, the compensation method of the finish rolling roll gap that a kind of stainless steel reinforced concrete rolls, and the method comprises the steps:
ksk_alpha=（alpha–alpha1）×coff_alpha；
S(I)=THEN(I+1)–DH(I)+S0(I)+KSK(I)+ksk_alpha，
Wherein THEN (I+1) represents the exit thickness of I frame.
The finishing stand draught pressure compensation method that aforesaid stainless steel reinforced concrete rolls, calculates the pressure correcting coefficient NNFKORR(Ia of each piece rolled steel), and carry out record, building database together with corresponding steel grade, thickness, width and chemical composition; NNFKORR(Ia wherein) computational methods are: NNFKORR(Ia)=NNFKORR(I
0)+0.68 * (F(I
0)-F(I
00))/F(I
00), NNFKORR(I wherein
0) piece steel pressure correcting coefficient in expression, F(I
0) actual pressure of piece steel correction in expression, F(I
00) the uncorrected setting pressure of piece steel in expression.
The finishing stand draught pressure compensation method that aforesaid stainless steel reinforced concrete rolls, according to 15 kinds of chemical composition: C, Si, Mn, P, S, Al, Cr, Cu, Mo, Ti, Ni, V, Nb, N, B in steel, at pressure correcting coefficient NNFKORR(Ia) in database, take and rolled 100 blocks of steel of steel several finishing stand rollings as calculation level returns, by the pressure coefficient NNFKORR(Ia of these 100 blocks of steel) averaging calculates alpha and alpha1; When steel is counted 100 of less thaies, get the pressure coefficient NNFKORR(I of the frame of actual block number
a).
The finishing stand draught pressure compensation method that aforesaid stainless steel reinforced concrete rolls, the absolute value of alpha-alpha1 and steel grade penalty coefficient coff_alpha corresponding relation are as follows:
The invention provides the milling method of hot steel rolling production, for stainless steel reinforced concrete, roll and added roll gap compensation, effectively expanded the specifications vary restriction of hot steel rolling production.
Accompanying drawing explanation
Fig. 1 rolling mill practice process of the present invention skeleton diagram;
The first finishing stand stiffness curve in Fig. 2 specific embodiment of the invention.
The second finishing stand stiffness curve in Fig. 3 specific embodiment of the invention.
The 3rd finishing stand stiffness curve in Fig. 4 specific embodiment of the invention.
The 4th finishing stand stiffness curve in Fig. 5 specific embodiment of the invention.
The 5th finishing stand stiffness curve in Fig. 6 specific embodiment of the invention.
The 6th finishing stand stiffness curve in Fig. 7 specific embodiment of the invention.
The 7th finishing stand stiffness curve in Fig. 8 specific embodiment of the invention.
The specific embodiment
For fully understanding the present invention's object, feature and effect, by following concrete embodiment, the present invention is elaborated.
The invention provides the milling method of hot steel rolling production, for stainless steel reinforced concrete, roll and added roll gap compensation, effectively expanded the specifications vary restriction of hot steel rolling production.
The control system of hot continuous rolling adopts two-stage computer control, and process control computer (L2 computer) is controlled with basic automatization computer (L1) and controlled.Technical scheme of the present invention is mainly the THICKNESS CONTROL for finishing mill, and THICKNESS CONTROL process is as follows:
S1 calculates the parameters of THICKNESS CALCULATION at L2 level computer;
S2 by L2 level calculation by computer to send L1 computer SDH module (setting proxy module) under message mode;
S3 sets up SDH to the communication channel of press control module;
S4 reads message data value, is sent to transmission system controll block, and design parameter is carried out, controlled.
The technology of the present invention to the effect that for L2 computer, the control method of thickness aspect has been carried out to inventive improvements.
The control procedure of conventional thickness calculating aspect is:
1, according to steel at finishing stand inlet thickness and exit thickness, determine according to the following equation each finishing stand reduction ratio,
Wherein, I represents finishing mill shelf number;
EPS(I) represent finishing stand reduction ratio;
THEN(I) represent that steel is at finishing stand inlet thickness;
THEN(I+1) represent that steel is at finishing stand exit thickness;
According to supplied materials (roughing outlet) thickness, finish rolling target thickness, be finished product (finish rolling outlet) thickness, determine each frame reduction ratio.The process allocation regulation of each frame inlet thickness and exit thickness basic of distribution finish rolling supplied materials thickness, exit thickness and each steel grade is determined.
2, according to following formula, determine each finishing mill draught pressure:
F（I）=NNFKORR（I）×MH（I）×EPS（I） （2）
Wherein, I represents finishing mill shelf number;
EPS(I) the finishing stand reduction ratio that representation formula (1) calculates;
MH(I) represent hardness number, hardness number can be tested according to standard GB/T231-2002.Hardness in the present invention refers to Brinell hardness (HB).
Describe average pressure correction factor NNFKORR(I below in detail) definite method:
(1) calculate the pressure correcting coefficient NNFKORR(Ia of each piece rolled steel), and carry out record, building database together with corresponding steel grade, thickness, width and chemical composition; Every steel NNFKORR(Ia wherein) computational methods are: NNFKORR(Ia)=NNFKORR(I0)+0.68 * (F(I
0)-F(I
00))/F(I
00), NNFKORR(I wherein
0) piece steel pressure correcting coefficient in expression, F(I
0) actual pressure of piece steel correction in expression, F(I
00) the uncorrected setting pressure of piece steel in expression.
(2) read average pressure correction factor NNFKORR(I): confirmation average pressure correction factor NNFKORR(I) is divided into long genetic value and two kinds of situations of short genetic value.Long genetic value really fixed condition is: 1), when this piece steel steel grade and upper block steel steel grade are when inconsistent, get long genetic value; 2) when being more than or equal to 10%, this piece steel thickness and upper piece steel Thickness Ratio get long genetic value; 3) when being relatively more than or equal to 10%, this piece steel width and upper piece steel width get long genetic value.Above three conditions, as long as meet a condition, are got long genetic value.
According to long genetic value, determine NNFKORR(I) method is: the mean value NNFKORR(Ia that gets 30 blocks of approaching steel in step (1) established data storehouse) is as the NNFKORR(I of this piece steel).During approaching steel number and be less than 30 blocks of steel in database, get the NNFKORR(Ia of actual bloom number) mean value.In database, during without this steel grade, NNFKORR(I) get default value 1.0.
Above-mentioned approaching steel refers to that in database, steel grade is identical, and chemical composition, thickness, width change and be less than 10% steel.Chemical composition change is less than 10% and refers to that C, Si, Mn, P, S, Al, Cr, Cu, Mo, Ti, Ni, V, Nb, N, each chemical composition of B and this piece steel differ all in 10%.
Short genetic value really fixed condition is: when steel grade, thickness, width change while being less than 10%, get short genetic value, go up piece steel NNFKORR(I) calculated value.
3, determine each finishing mill roll gap value S (I):
S(I)=THEN(I+1)–DH(I)+S0(I)+KSK(I) （3）
Wherein, I represents finishing mill shelf number;
THEN (I+1) represents the exit thickness of I frame;
S0 (I) represents roll gap at zero point, after each roll change, every rolling mill all will carry out acyclic homologically trioial, acyclic homologically trioial refers to that roll gap that this frame draught pressure under no-load condition reaches 1500 ton hours is as zero roll gap, but in actual acyclic homologically trioial process, the unloaded draught pressure of milling train reaches 1500 ton hours and has deviation, sometimes larger, sometimes smaller, the difference of the roll gap under the roll gap under actual acyclic homologically trioial pressure and 1500 tons is called roll gap at zero point, this value is measured automatically by spot sensor, reaches L2 computer afterwards by L1 computer.
KSK(I) be roll gap correction value, when its computational methods are upper piece steel rolling actual roll gap with calculate the poor of roll gap, i.e. KSK (I)=upper actual roll gap of piece steel-upper piece steel calculating roll gap; After roll change, first this parameter value of steel is 0.
DH(I) represent the bouncing value under draught pressure that this frame calculates at formula (2), this bouncing value is got bouncing value corresponding on curve according to force value from the stiffness curve of each frame.For example, in a specific embodiment, adopt 7 finishing mills, the stiffness curve of each frame of finish rolling is as shown in Fig. 2-8.Stiffness curve is draught pressure and the corresponding curve of spring, and abscissa represents draught pressure (unit: KN), ordinate represents the bouncing value (unit: mm), read bouncing value DH(I from curve) of roll gap under this draught pressure.
When mixed rolling, above-mentioned computational methods can not meet the thickness requirement with steel, thereby have influence on rolling accuracy.The present invention, on above-mentioned calculating basis, is revised as formula (3):
S(I)=THEN(I+1)–DH(I)+S0(I)+KSK(I)+ksk_alpha （4）
Describe the compensation method of the finish rolling roll gap that stainless steel reinforced concrete rolls below in detail, the method comprises the steps:
Describe definite method of chemical composition factor alpha and alpha1 below in detail.
(1) according to 15 kinds of chemical composition: C, Si, Mn, P, S, Al, Cr, Cu, Mo, Ti, Ni, V, Nb, N, B, from pressure correcting coefficient NNFKORR(Ia) database get the pressure coefficient NNFKORR(Ia of each frame (for example F0～F6) of 100 blocks of steel of recent rolling that chemical composition is identical); As 100 blocks of steel of less than, get the pressure coefficient NNFKORR(Ia of each frame of actual block number); As in database without identical chemical composition, get the pressure coefficient NNFKORR(Ia of each frame of 100 blocks of steel (100 blocks of steel of less than, get actual block number) of similar chemical composition); As in database without similar chemical composition, get default value 1.0.
The most recent above-mentioned rolling refers to take is rolled steel as calculation level time point toward travelling backwards, the same or similar 100 blocks of steel of chemical composition or the actual steel of the finishing stand rolling of counting.
Similar chemical composition refers to that C, Si, Mn, P, S, Al, Cr, Cu, Mo, Ti, Ni, V, Nb, N, each chemical composition of B and this piece steel differ all in 10wt%.
(2) by the pressure coefficient NNFKORR(Ia of institute's organic frame of got steel) calculating mean value, this mean value is the chemical composition factor alpha of this piece steel.
ksk_alpha=（alpha–alpha1）×coff_alpha （5）
After each roll change, every rolling mill all will carry out acyclic homologically trioial, and acyclic homologically trioial refers to that roll gap that this frame draught pressure under no-load condition reaches 1500 ton hours is as zero roll gap.But in actual acyclic homologically trioial process, the unloaded draught pressure of milling train reaches 1500 ton hours and has deviation, sometimes larger, sometimes smaller, the difference of the roll gap under the roll gap under actual acyclic homologically trioial pressure and 1500 tons is called roll gap at zero point.This value can be measured automatically by spot sensor, reaches L2 computer afterwards by L1 computer.
S(I)=THEN(I+1)–DH(I)+S0(I)+KSK(I)+ksk_alpha （4）
Wherein THEN (I+1) represents the exit thickness of I frame.
Preferably, steel grade penalty coefficient coff_alpha, as shown in table 1,
Table 1: steel grade penalty coefficient value table
The present invention can improve on-the-spot rolling stability, improve production efficiency and product quality, and makes the production of hot continuous rolling meet the production requirement of small lot, many kinds, many structures, has improved the competitiveness of product.
Use method of the present invention, can adjust steel breed structure, realize variety steel open rolling, stainless steel without hot rolling material, kind steel reinforced concrete roll, the leap of the aspect such as the rolling of steel grade specification large span, non-scheduling transition specification, economic benefit is obvious, for the lifting of competitive power of product plays a key effect.
Use method of the present invention, can realize the special kinds such as pure iron, titanium plate at the development and production of hot continuous rolling operation, promoted Taiyuan Iron and Steel Co. competitiveness.
Below by specific embodiment, set forth this method, one skilled in the art will appreciate that this should not be understood to the restriction to the claims in the present invention scope.
Embodiment
for stainless steel and carbon steel, mix the method for the compensation of roll gap while pricking
The concrete composition (wt%) of the carbon steel SPAH using in following examples, stainless steel TTS443, carbon steel T510L, stainless steel SUS304, carbon steel SPHC, stainless steel 00CR18MO2 is as follows:
SPAH：C：0.09、Si：0.47、Mn：0.4、P：0.01、S：0.01、Al：0、Cr：0.36、Cu：0.27、Mo：0、Ti：0、Ni：0.12、V：0、Nb：0、N：0、B：0。
TTS443：C：0.005、Si：0.39、Mn：0.08、P：0.01、S：0.002、Al：0、Cr：20.68、Cu：0.37、Mo：0、Ti：0.19、Ni：0.09、V：0、Nb：0.14、N：0.014、B：0。
T510L：C：0.097、Si：0.07、Mn：1.25、P：0.01、S：0.005、Al：0.026、Cr：0.02、Cu：0.009、Mo：0、Ti：0.001、Ni：0.017、V：0、Nb：0.019、N：0、B：0。
SUS304：C：0.05、Si：0.45、Mn：1.14、P：0.03、S：0.002、Al：0、Cr：18.19、Cu：0、Mo：0.07、Ti：0、Ni：8.02、V：0、Nb：0、N：0.04、B：0。
SPHC：C：0.04、Si：0.02、Mn：0.27、P：0.01、S：0.01、Al：0.06、Cr：0、Cu：0、Mo：0、Ti：0、Ni：0.02、V：0、Nb：0、N：0、B：0；
00CR18MO2:C：0.005、Si：0.29、Mn：0.1、P：0.01、S：0.001、Al：0、Cr：17.55、Cu：0、Mo：0.1、Ti：0.14、Ni：0.09、V：0、Nb：0.15、N：0.016、B：0。
During embodiment 1 finish rolling, SPAH and TTS443 switch
According to the flow process of Fig. 1, SPAH and TTS443 continuous casting steel billet are switched to processing, the size of this SPAH and TTS443 continuous casting steel billet respectively: thickness 220mm, width 1280mm, length 9.4m and thickness 200mm, width 1280mm, length 8.6m.This embodiment control system adopts two-stage computer control, and process control computer (L2 computer) is controlled with basic automatization computer (L1) and controlled.Change the working roll of finishing mill, according to milling train both sides roll-force and the poor situation of oil column, redefine the roll gap zero-bit of milling train.
SPAH and TTS443 continuous casting steel billet are carried out to heat treated at heating furnace 0 and 1# respectively, and wherein the heating-up temperature of 0# heating furnace is 1250 ℃, and the heat time is 200 minutes; The heating-up temperature of 1# heating furnace is 1200 ℃, and the heat time is 190 minutes.
SPAH after heat treated and TTS443 continuous casting steel billet enter respectively the water that high-pressure water descaling case is 17MPa with pressure and rinse 9.4 seconds and 8.6 seconds.
SPAH after high-pressure water descaling and TTS443 continuous casting plate enter respectively roughing mill, and roughing vertical roll is controlled width, and plain-barreled roll is controlled thickness.Through the rolling of roughing unit, the SPAH belt steel thickness obtaining is that 42mm, width are 1250mm, and temperature is 1100 ℃, and TTS443 belt steel thickness is that 33mm, width are 1285mm, and temperature is 1060 ℃.
Through the rolling of mm finishing mill unit, the SPAH belt steel thickness obtaining is that 2.91mm, width are 1250mm, and temperature is 860 ℃, and TTS443 belt steel thickness is that 3.9mm, width are 1285mm, and temperature is 880 ℃.
Mm finishing mill unit comprises 7 finishing stands.
According to its 15 kinds of chemical composition: C, Si, Mn, P, S, Al, Cr, Cu, Mo, Ti, Ni, V, Nb, N, B, from pressure correcting coefficient NNFKORR(Ia) database get the pressure coefficient NNFKORR(Ia of each frame of nearest 100 blocks of steel that chemical composition is identical), calculating mean value, to obtain SPAH be 1.05, TTS443 with the chemical composition factor alpha of steel is 0.73 with the chemical composition factor alpha of steel.According to SPAH band steel and TTS443 band steel chemical composition factor difference 0.32, determine that steel grade penalty coefficient coff_alpha is 0.1.According to formula ksk_alpha=(alpha – alpha1) * coff_alpha, roll gap penalty coefficient ksk_alpha is ± 0.032mm.According to roll gap S (I after roll gap correction value KSK (I)=upper piece steel correction
0)-upper uncorrected roll gap the S of piece steel (I
00), calculate the roll gap correction value of each frame.According to the difference of the roll gap of the roll gap under actual acyclic homologically trioial pressure and 1500 tons of lower acyclic homologically trioials, determine each frame roll gap at zero point S0 (I).
According to following formula, determine each finishing mill roll gap: S (I)=THEN (I+1) – DH (I)+S0 (I)+KSK (I)+ksk_alpha.According to the draught pressure of following table and rolling temperature, SPAH band steel and TTS443 band steel are switched to finish rolling.
After above-mentioned finish rolling, the SPAH obtaining is 2.93mm with the thickness of steel, and TTS443 is 3.88mm with the thickness of steel, meets customer requirement.Finally by coiling machine, band steel is configured as to coil of strip.
During embodiment 2 finish rolling, T510L and SUS304 switch
The present embodiment adopts process substantially the same manner as Example 1, and difference is:
The size of T510L and SUS304 continuous casting steel billet is respectively: thickness 220mm, width 1310mm, length 6.89m and thickness 180mm, width 1240mm, length 9.6m.
Through the rolling of roughing unit, the T510L belt steel thickness obtaining is that 40mm, width are 1300mm, and temperature is 1080 ℃, and SUS304 belt steel thickness is that 37mm, width are 1250mm, and temperature is 1090 ℃.
Through the rolling of mm finishing mill unit, the T510L belt steel thickness obtaining is that 2.91mm, width are 1300mm, and temperature is 900 ℃, and SUS304 belt steel thickness is that 3.0mm, width are 1240mm, and temperature is 980 ℃.
T510L is 1.09, SUS304 with the chemical composition factor alpha of steel is 1.47 with the chemical composition factor alpha of steel.According to T510L band steel and SUS304 band steel chemical composition factor difference 0.38, determine that steel grade penalty coefficient coff_alpha is 0.2.According to formula ksk_alpha=(alpha – alpha1) * coff_alpha, roll gap penalty coefficient ksk_alpha is ± 0.072mm.
According to following formula, determine each finishing mill roll gap: S (I)=THEN (I+1) – DH (I)+S0 (I)+KSK (I)+ksk_alpha.According to the draught pressure of following table and rolling temperature, T510L band steel and SUS304 band steel are switched to finish rolling.
After above-mentioned finish rolling, the thickness of the T510L obtaining is 2.93mm, and SUS304 is 2.98mm with the thickness of steel, meets customer requirement.Finally by coiling machine, band steel is configured as to coil of strip.
During embodiment 3 finish rolling, SPHC and 00CR18MO2 switch
The present embodiment adopts process substantially the same manner as Example 1, and difference is:
The size of SPHC and 00CR18MO2 continuous casting steel billet is respectively: thickness 220mm, width 1250mm, length 9.4m and thickness 200mm, width 1240mm, length 8.6m.
Through the rolling of roughing unit, the SPHC belt steel thickness obtaining is that 45mm, width are 1250mm, and temperature is 1080 ℃, and 00CR18MO2 belt steel thickness is that 33mm, width are 1255mm, and temperature is 1060 ℃.
Through the rolling of mm finishing mill unit, the SPHC belt steel thickness obtaining is that 4.9mm, width are 1250mm, and temperature is 860 ℃, and 00CR18MO2 belt steel thickness is that 3.9mm, width are 1255mm, and temperature is 860 ℃.
SPHC is 0.73,00CR18MO2 with the chemical composition factor alpha of steel is 0.88 with the chemical composition factor alpha of steel.According to SPHC and 00CR18MO2 band steel chemical composition factor difference 0.15, determine that steel grade penalty coefficient coff_alpha is 0.According to formula ksk_alpha=(alpha – alpha1) * coff_alpha, roll gap penalty coefficient ksk_alpha is 0.
According to following formula, determine each finishing mill roll gap: S (I)=THEN (I+1) – DH (I)+S0 (I)+KSK (I)+ksk_alpha.According to the draught pressure of following table and rolling temperature, SPHC and 00CR18MO2 band steel are switched to finish rolling.
After above-mentioned finish rolling, the thickness of the SPHC obtaining is 4.92mm, and 00CR18MO2 is 3.89mm with the thickness of steel, meets customer requirement.Finally by coiling machine, band steel is configured as to coil of strip.
During embodiment 4 finish rolling, SPHC and SUS304 switch
The present embodiment adopts process substantially the same manner as Example 1, and difference is:
The size of SPHC and SUS304 continuous casting steel billet is respectively: thickness 220mm, width 1250mm, length 9.4m and thickness 180mm, width 1240mm, length 9.6m.
Through the rolling of roughing unit, the SPHC belt steel thickness obtaining is that 45mm, width are 1250mm, and temperature is 1080 ℃, and SUS304 belt steel thickness is that 37mm, width are 1250mm, and temperature is 1090 ℃.
Through the rolling of mm finishing mill unit, the SPHC belt steel thickness obtaining is that 4.9mm, width are 1250mm, and temperature is 860 ℃, and SUS304 belt steel thickness is that 3.0mm, width are 1240mm, and temperature is 980 ℃.
SPHC is 0.73, SUS304 with the chemical composition factor alpha of steel is 1.47 with the chemical composition factor alpha of steel.According to SPHC and SUS304 band steel chemical composition factor difference 0.74, determine that steel grade penalty coefficient coff_alpha is 0.74.According to formula ksk_alpha=(alpha – alpha1) * coff_alpha, roll gap penalty coefficient ksk_alpha is 0.23mm.
According to following formula, determine each finishing mill draught pressure: S (I)=THEN (I+1) – DH (I)+S0 (I)+KSK (I)+ksk_alpha.According to the draught pressure of following table and rolling temperature, SPHC and 00CR18MO2 band steel are switched to finish rolling.
After above-mentioned finish rolling, the thickness of the SPHC obtaining is 4.88mm, and SUS304 is 3.01mm with the thickness of steel, meets customer requirement.Finally by coiling machine, band steel is configured as to coil of strip.
Claims (4)
1. a compensation method for the finish rolling roll gap that stainless steel reinforced concrete rolls, the method comprises the steps:
Step 1, determines and treats the chemical composition factor alpha of finish rolling steel and the chemical composition factor alpha1 of lastblock finish rolling steel; Then, according to the absolute value of alpha-alpha1, determine steel grade penalty coefficient coff_alpha, wherein steel grade penalty coefficient coff_alpha is 0-0.6;
Step 2, calculates roll gap penalty coefficient ksk_alpha according to following formula,
ksk_alpha=（alpha–alpha1）×coff_alpha；
Step 3, the stiffness curve during according to acyclic homologically trioial, determines the bouncing value DH(I of each finishing stand), wherein I represents finishing stand number;
Step 4, determines the roll gap S0 at zero point (I) after acyclic homologically trioial, and wherein I represents finishing stand number;
Step 5, determines roll gap correction value KSK (I), and wherein I represents finishing stand number;
Step 6, according to following formula, determine each finishing mill roll gap value S (I):
S(I)=THEN(I+1)–DH(I)+S0(I)+KSK(I)+ksk_alpha，
Wherein THEN (I+1) represents the exit thickness of I frame.
2. the finishing stand draught pressure compensation method that stainless steel reinforced concrete according to claim 1 rolls, it is characterized in that, calculate the pressure correcting coefficient NNFKORR(Ia of each piece rolled steel), and carry out record, building database together with corresponding steel grade, thickness, width and chemical composition; NNFKORR(Ia wherein) computational methods are: NNFKORR(Ia)=NNFKORR(I
0)+0.68 * (F(I
0)-F(I
00))/F(I
00), NNFKORR(I wherein
0) piece steel pressure correcting coefficient in expression, F(I
0) actual pressure of piece steel correction in expression, F(I
00) the uncorrected setting pressure of piece steel in expression.
3. the finishing stand draught pressure compensation method that stainless steel reinforced concrete according to claim 1 and 2 rolls, it is characterized in that, according to 15 kinds of chemical composition: C, Si, Mn, P, S, Al, Cr, Cu, Mo, Ti, Ni, V, Nb, N, B in steel, at pressure correcting coefficient NNFKORR(Ia) in database, take and rolled 100 blocks of steel of steel several finishing stand rollings as calculation level returns, by the pressure coefficient NNFKORR(Ia of these 100 blocks of steel) averaging calculates alpha and alpha1; When steel is counted 100 of less thaies, get the pressure coefficient NNFKORR(Ia of the frame of actual block number).
4. the finishing stand draught pressure compensation method of rolling according to the stainless steel reinforced concrete described in claim 1-3 any one, is characterized in that, the absolute value of alpha-alpha1 and steel grade penalty coefficient coff_alpha corresponding relation are as follows:
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| CN201310445745.4A Active CN103506405B (en) | 2013-09-26 | 2013-09-26 | The compensation method of the finish rolling roll gap that stainless steel reinforced concrete rolls |
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| CN104209343A (en) * | 2014-09-05 | 2014-12-17 | 山西太钢不锈钢股份有限公司 | Control method of compensation speed decrease of hot continuous rolling finish rolling rack |
| CN105855298A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Method for calculating hot rolling force of high-precision boron-containing steel |
| CN107153355A (en) * | 2017-05-31 | 2017-09-12 | 西安交通大学 | A kind of CSP gap values between rollers dynamic self-adapting control method |
| CN108700866A (en) * | 2016-02-22 | 2018-10-23 | 首要金属科技奥地利有限责任公司 | The on-line calibration of the roll gap of rolling-mill housing |
| CN109277414A (en) * | 2018-10-25 | 2019-01-29 | 山西太钢不锈钢股份有限公司 | Control method for rolling for hot-tandem unit |
| CN110252827A (en) * | 2019-06-04 | 2019-09-20 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of high speed strip-mill strip flexibility leveling control method |
| CN110743921A (en) * | 2019-09-27 | 2020-02-04 | 张家港扬子江冷轧板有限公司 | Compensation method for thickness of acid rolling |
| CN111558615A (en) * | 2020-05-18 | 2020-08-21 | 山西太钢不锈钢股份有限公司 | Method for controlling finish rolling pressure of titanium plate on hot continuous rolling line |
| CN114472545A (en) * | 2022-02-15 | 2022-05-13 | 山西太钢不锈钢股份有限公司 | Finishing mill loop-lifting angle dynamic control method |
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| CN104209343A (en) * | 2014-09-05 | 2014-12-17 | 山西太钢不锈钢股份有限公司 | Control method of compensation speed decrease of hot continuous rolling finish rolling rack |
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| CN108700866A (en) * | 2016-02-22 | 2018-10-23 | 首要金属科技奥地利有限责任公司 | The on-line calibration of the roll gap of rolling-mill housing |
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| CN107153355A (en) * | 2017-05-31 | 2017-09-12 | 西安交通大学 | A kind of CSP gap values between rollers dynamic self-adapting control method |
| CN109277414B (en) * | 2018-10-25 | 2020-11-03 | 山西太钢不锈钢股份有限公司 | Rolling control method for hot continuous rolling finishing mill group |
| CN109277414A (en) * | 2018-10-25 | 2019-01-29 | 山西太钢不锈钢股份有限公司 | Control method for rolling for hot-tandem unit |
| CN110252827A (en) * | 2019-06-04 | 2019-09-20 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of high speed strip-mill strip flexibility leveling control method |
| CN110252827B (en) * | 2019-06-04 | 2021-01-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Flexible leveling control method for high-speed strip rolling mill |
| CN110743921A (en) * | 2019-09-27 | 2020-02-04 | 张家港扬子江冷轧板有限公司 | Compensation method for thickness of acid rolling |
| CN110743921B (en) * | 2019-09-27 | 2021-11-30 | 张家港扬子江冷轧板有限公司 | Compensation method for thickness of acid rolling |
| CN111558615A (en) * | 2020-05-18 | 2020-08-21 | 山西太钢不锈钢股份有限公司 | Method for controlling finish rolling pressure of titanium plate on hot continuous rolling line |
| CN114472545A (en) * | 2022-02-15 | 2022-05-13 | 山西太钢不锈钢股份有限公司 | Finishing mill loop-lifting angle dynamic control method |
| CN114472545B (en) * | 2022-02-15 | 2023-10-31 | 山西太钢不锈钢股份有限公司 | Dynamic control method for loop lifting angle of finishing mill loop |
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Address after: 030003, Shanxi, Taiyuan, pointed lawn area, lawn street, No. 2 Patentee after: Shanxi Taigang Stainless Steel Co.,Ltd. Address before: 030003 No. 2, sharp lawn, Taiyuan City, Shanxi Province Patentee before: Shanxi Taigang Stainless Steel Co.,Ltd. |