CN105177444B - Normalizing control method for producing low-temperature high-magnetic-induction oriented silicon steel - Google Patents
Normalizing control method for producing low-temperature high-magnetic-induction oriented silicon steel Download PDFInfo
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- CN105177444B CN105177444B CN201510730202.6A CN201510730202A CN105177444B CN 105177444 B CN105177444 B CN 105177444B CN 201510730202 A CN201510730202 A CN 201510730202A CN 105177444 B CN105177444 B CN 105177444B
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Abstract
The invention provides a normalizing control method for producing low-temperature high-magnetic-induction oriented silicon steel. The method comprises the steps that the components of the applicable steel comprise, by weight, 3.0%-3.35% of Si, 0.045%-0.065% of C, 0.0220%-0.0320% of Als, 0.080%-0.090% of Mn, 0.005%-0.010% of S, 0.006%-0.010% of N, 0.014%-0.015% of Cu, 0.040%-0.042% of Sn and less than 0.25% of Cr and Ni; smelting and continuous casting are performed on the steel to form a blank; two-stage normalizing is performed after hot rolling is performed; a P1.1/50 value of the steel plate is detected, and whether the value is larger than or equal to alpha and smaller than or equal to beta is judged; timing rolling is performed; decarburizing annealing and nitriding annealing are performed; the subsequent procedures such as magnesium oxide annealing separant coating are performed. According to the normalizing control method, normalizing temperature setting is performed through the relation between the iron loss value P1.1/50 of the low-temperature Hi-B steel normalizing plate and the temperature of the normalizing thermal treatment high-temperature-section steel plate to enable the P1.1/50 value of Als normalizing coils to be controlled within a needed P1.1/50 range, and therefore the product with the good magnetism is obtained.
Description
Technical field
The present invention relates to a kind of method for producing high magnetic induction grain-oriented silicon steel, specifically belongs to a kind of high magnetic strength of production low temperature and takes
To the normalizing control method of silicon steel.
Background technology
Grain-oriented Si steel sheet is a kind of important alloy magnetic material, industrially excellent using what is possessed in its rolling direction
Good magnetization property is preparing transformer core.And weighing magnetic property of oriented silicon steel mainly has following two major parameters：Certain
The magnetic induction B that stalloy possesses is detected under the conditions of magnetic field intensity TT（Unit T）, and certain frequency and certain magnetic induction
Iron loss P of lower excitation processT（Unit W/Kg）.In order to obtain higher magnetic induction and relatively low iron loss, orientation silicon steel is necessary
Obtain good secondary recrystallization tissue after high annealing operation, that is, possess good bit to Gauss orientation i.e. crystal
{ 110 } face is parallel to rolled surface,<001>Parallel to rolling to and suitable finished product grain size.At present, according to oriented silicon
The measured magnetic strength B under 800A/m field intensity of steel800Product is divided into into two classes：B800In below 1.890T, referred to as typically take
To silicon steel（CGO）；B800Reach the referred to as high magnetic induction grain-oriented silicon steel of 1.890T and the above（Hi-B or HGO）.
In prior art, the production method of low temperature Hi-B orientation silicon steels mainly has high temperature slab heating temperature（Higher than 1350
℃）Prepare Hi-B steel methods, middle temperature slab heating temperature（Between 1200 DEG C to 1350 DEG C）Prepare Hi-B steel method and cryopanel
Base heating-up temperature（Less than 1200 DEG C）Prepare Hi-B steel methods.
High temperature HiB steel adopts traditional inhibitor method, is that the precipitated phase such as MnS, AlN is produced as inhibitor using in coil of strip
The method of Hi-B steel.0.04 ~ 0.08%, higher carbon content possesses one in ensure that course of hot rolling to high temperature Hi-B steel carbon content
Determine γ Phase Proportions；In high temperature Hi-B steel, the congenital inhibitor such as MnS, AlN, is rolled through hot-rolled temperature in γ phase solid solution large percentages
Cooling and oiler temperature control can control the uniform and stable precipitation of inhibitor in hot rolled plate afterwards.Normalizing process is to high temperature HiB steel
Prepare most important.From in metallographic change, after normalizing recrystal grain compared with hot rolled plate showed increased, but normalizing process texture
Vary less, main GOSS nucleus will be preserved.The Main Function of normalizing operation is that precipitated phase obtains back dissolving again and analysis
Go out, its mechanism of action is to make the inhibitor granule Jing slow cooling insulation after high-temperature heating back dissolving based on AlN, the MnS in hot rolled plate
Disperse educt, then it is quick cross water quick cooling prevent from separating out this kind of particle growth.Inhibitor density after normalizing increases, and possesses higher
Rejection ability, will all play an important role during primary recrystallization and secondary recrystallization abnormal growth.
And low temperature Hi-B steel methods, abandoned using MnS and the various shortcoming that high-temperature heating brings must have been taken as inhibitor, adopted
With relatively low heating-up temperature can solid solution AlN as inhibitor.For reduction solid solubility temperature and to primary recrystallization during decarburizing annealing
Grow up and play suitable inhibitory action, the Al and N in low temperature Hi-B steel strands must take strict Composition Control.And low temperature
Hi-B methods Jing smelt casting obtain inherent inhibitor to rejection ability in the final high annealing of coil of strip be it is inadequate, it is secondary to tie again
Brilliant abnormal growth can be incomplete, in addition it is also necessary to carries out nitrogen pick-up process and form new inhibitor moving back to strengthen high temperature after decarburizing annealing
The rejection ability of AlN during fire.Therefore, although the normalizing annealing effect of low temperature Hi-B steel and the control separated out to inhibitor
System, but the precipitation of AlN class inhibitor is mainly controlled, and the Main Function of this kind of inhibitor is strengthened to during decarburizing annealing
The control that primary recrystallization crystal grain is grown up, so that ensure the driving force in secondary recrystallization abnormal growth.
In actual normalizing production process, hot rolling raw material is not unalterable.Even if strict control steel-making and hot rolling technology, no
With between heat, between the different casting blank of same heat order, and hot rolling batch between Product Status exist unavoidably
Difference.When fluctuation after technique acceptable normal range in will not end properties be produced with considerable influence, but fluctuation journey
Degree can affect product quality beyond normal range.Front operation volume extremely is moved back through existing normalizing, cold rolling, decarburization, nitriding, high temperature
Produce after the longer operation such as fire, it is impossible to obtain the HiB products that performance is consistent.Both the final Hi-B of oriented silicon steel had been reduced qualified
Rate, is also unfavorable for reducing the high production cost of orientation silicon steel.
The present invention is according to low temperature Hi-B steel actual production features and a large amount of Field Production Datas, constant in existing steel grades
Under conditions of, the control method that a kind of normalizing process is implemented and the detection of normalizing board status judges is developed, is timely and effectively controlled
The stability of normalizing volume, reduces the fluctuation of finished product magnetic property, reduces production cost while improving orientation HiB qualification rates.
Low temperature Hi-B steel production process processes are rolled onto the product of being prepared into from hot rolling, it usually needs through normalizing annealing, cold rolling, de-
The complicated heat treatment link such as carbon annealing, nitriding annealing, high annealing and finished product coating annealing.Each heat treatment link is mutually adapted,
The texture and precipitate form for meeting the requirements could be formed before final high annealing, into fine magnetic property two
Secondary recrystallized structure.
The content of the invention
The present invention for prior art exist low temperature HiB steel normalizing heat treatment processes material tests it is loaded down with trivial details and it is time-consuming compared with
It is long, be difficult to after normalizing, volume carries out the problem of timely detection extremely, there is provided it is a kind of to utilize low temperature Hi-B steel normalizing plate core loss values
P1.1/50The optimal P of normalizing volume under different Als contents is defined from the relation between the final magnetic property of product1.1/50Scope, and
According to normalizing plate core loss value P1.1/50Contacting between normalizing heat treatment high temperature section temperature carries out normalizing temperature process control, makes
Obtain steel plate P after normalizing1.1/50Value can be controlled in optimum range, so as to realize the Proper Match of normalizing process and steel grades,
Stably produce the normalizing control method of the low temperature high magnetic induction grain-oriented silicon steel of excellent magnetic.
Realize the concrete measure of above-mentioned purpose：
A kind of normalizing control method for producing low temperature high magnetic induction grain-oriented silicon steel, its step：
1）The component of the steel that is suitable for and weight percent content are：Si：3.00~3.35%、C：0.045~0.065%、Als：
0.0220~0.0320%、Mn：0.080~0.090%、S：0.005~0.010%、N：0.006~0.010%、Cu ：0.014~
0.015%、Sn：0.040 ~ 0.042%, Cr and Ni total contents are less than 0.25%, and remaining is Fe and inevitable field trash；
2）Base post-heating is smelted and is casting continuously to form according to mentioned component, and heating-up temperature is at 1150 ~ 1250 DEG C；
3）Jing after conventional hot rolling, two-part normalizing annealing is carried out：First paragraph normalizing steel billet temperature T is according to Als in hot rolled coil
Content is controlled, and is incubated 20 ~ 30S；Then reduce steel billet temperature and second segment normalizing is proceeded by 890 ~ 910 DEG C, and protect
100 ~ 120s of temperature；
The span of control of wherein normalizing first paragraph steel billet temperature T is controlled according to following empirical equation：
1182.1-0.400×106×[Als]≤T≤1237.9-0.495×106×[Als]
In above formula：Steel plate observed temperature in the annealing furnace that T represents shown by thermocouple, unit for DEG C；
Als represents the content of Als in steel plate, is multiplied with pure decimal value；
4）Coil of strip state after normalizing is judged：The P of detection steel plate1.1/50Value, and judge the value whether α≤
P1.1/50In the range of≤β, wherein：
α=10.71×e197.5×[Als]+1.35×D-14×[Si]+0.055；
β=10.95×e158.1×[Als]+1.35×D-14×[Si]+0.055；
In formula：Als represents the content of Als in steel plate, is substituted into pure decimal value and calculate in formula；
Si represents the content of Si in steel plate, is substituted into pure decimal value and calculate in formula；
D represents the thickness of institute's normalizing plate, and unit is：mm；
If P1.1/50In α≤P1.1/50In the range of≤β, then show P1.1/50Meet and require, proceed rear operation；If P1.1/50
Less than α or P1.1/50More than β, then P is illustrated1.1/50It is abnormal；
5）At 150 ~ 220 DEG C, timeliness is rolling to finished product thickness；
6）Decarburizing annealing is carried out, and C content is controlled in below 10ppm；Nitriding annealing is carried out again, controls final N content
140-300ppm；
7）Routine is coated magnesium oxide annealing separating agent, final high annealing；After coating tensile coating, stretching and leveling etc.
Operation.
The present invention is by the P corresponding to the excellent magnetic product according to difference Als1.1/50Scope, adopts in normalizing operation
P1.1/50=e(2.86-0.000395×T)The empirical equation of+1.35 × D-14 × [Si]+0.055 carries out normalizing process temperature control so that
P is rolled up in normalizing1.1/50Value detects the P of normalizing plate after normalizing within zone of reasonableness1.1/50Value just can determine rapidly normalizing and just roll up
It is whether normal, so as to take corresponding restriction, production is sent under the abnormal volume restriction in time that substandard product will be produced, will not conformed to
Lattice product are eliminated in early stage rather than after whole process cycle is completed so that the HiB qualification rates of finished product are improved, accordingly
Cost consumption is minimized.
Compared with prior art, which utilizes low temperature Hi-B steel normalizing plate core loss value P to the present invention1.1/50It is high with normalizing heat treatment
Contact between temperature section steel billet temperature is carrying out normalizing temperature setting so that the P of different Als normalizing volumes1.1/50Value control is in magnetic
P needed for qualified products1.1/50In the range of, so as to obtain the product of excellent magnetic, realize that normalizing process is reasonable with steel grades
Matching, the abnormal normalizing product of control waste production, reach the purpose of the excellent product of steady production.
Specific embodiment
Below the present invention is described in detail：
Table 1 is the main technologic parameters list of various embodiments of the present invention and comparative example；
Table 2 is each embodiment of invention and comparative example material parameter, the average magnetic of finished product and HiB qualification rate lists；
The composition of the low temperature high magnetic induction grain-oriented silicon steel of various embodiments of the present invention production is in following component and content range（With
Wt% is counted）Value：
Si：3.00~3.35%、C：0.045~0.065%、Als：0.0220~0.0320%、Mn：0.080~0.090%、S：
0.005~0.010%、N：0.006~0.010%、Cu ：0.014~0.015%、Sn：0.040 ~ 0.042%, Cr and Ni total contents are less than
0.25%, remaining is Fe and inevitable field trash.
Various embodiments of the present invention are produced according to following steps：
A kind of normalizing control method for producing low temperature high magnetic induction grain-oriented silicon steel, its step：
1）The component of the steel that is suitable for and weight percent content are：Si：3.00~3.35%、C：0.045~0.065%、Als：
0.0220~0.0320%、Mn：0.080~0.090%、S：0.005~0.010%、N：0.006~0.010%、Cu ：0.014~
0.015%、Sn：0.040 ~ 0.042%, Cr and Ni total contents are less than 0.25%, and remaining is Fe and inevitable field trash；
2）Base post-heating is smelted and is casting continuously to form according to mentioned component, and heating-up temperature is at 1150 ~ 1250 DEG C；
3）Jing after conventional hot rolling, two-part normalizing annealing is carried out：First paragraph normalizing steel billet temperature T is according to Als in hot rolled coil
Content is controlled, and is incubated 20 ~ 30S；Then reduce steel billet temperature and second segment normalizing is proceeded by 890 ~ 910 DEG C, and protect
100 ~ 120s of temperature；
The span of control of wherein normalizing first paragraph steel billet temperature T is controlled according to following empirical equation：
1182.1-0.400×106×[Als]≤T≤1237.9-0.495×106×[Als]
In above formula：Steel plate observed temperature in the annealing furnace that T represents shown by thermocouple, unit for DEG C；
Als represents the content of Als in steel plate, is multiplied with pure decimal value；
4）Coil of strip state after normalizing is judged：The P of detection steel plate1.1/50Value, and judge the value whether α≤
P1.1/50In the range of≤β, wherein：
α=10.71×e197.5×[Als]+1.35×D-14×[Si]+0.055；
β=10.95×e158.1×[Als]+1.35×D-14×[Si]+0.055；
In formula：Als represents the content of Als in steel plate, is substituted into pure decimal value and calculate in formula；
Si represents the content of Si in steel plate, is substituted into pure decimal value and calculate in formula；
D represents the thickness of institute's normalizing plate, and unit is：mm；
If P1.1/50In α≤P1.1/50In the range of≤β, then show P1.1/50Meet and require）, proceed rear operation；If
P1.1/50Less than α or P1.1/50More than β, then P is illustrated1.1/50It is abnormal；
5）At 150 ~ 220 DEG C, timeliness is rolling to finished product thickness；
6）Decarburizing annealing is carried out, and C content is controlled in below 10ppm；Nitriding annealing is carried out again, controls final N content
140-300ppm；
7）Routine is coated magnesium oxide annealing separating agent, final high annealing；After coating tensile coating, stretching and leveling etc.
Operation.
The main technologic parameters list of 1 various embodiments of the present invention of table and comparative example
Continued access table 1
Table 2 is each embodiment of invention and comparative example material parameter, the average magnetic of finished product and HiB qualification rate lists
The computational methods of finished product HiB qualification rates in table 2, are that coil of strip magnetic strength meets B during product inspection800>=1.89T portions
Divide the ratio of weight and gross mass.
From embodiment table 2 as can be seen that being adjusted control coil of strip P to normalizing process using the inventive method1.1/50Value exists
In zone of reasonableness, the finished product B for producing800>=1.90T, P1.7/50The high magnetic induction grain-oriented silicon steel of≤0.98W/kg, and overall HiB
Qualification rate is more than 86%.And using the HiB that the product magnetic property of usual manner production is in below 1.9T and final in comparative example
Qualification rate is integrally less than 80%.
This specific embodiment is only most preferably enumerated, not the restricted enforcement to technical solution of the present invention.
Claims (1)
1. a kind of normalizing control method for producing low temperature high magnetic induction grain-oriented silicon steel, its step：
1）The component of the steel that is suitable for and weight percent content are：Si：3.00~3.35%、C：0.045~0.065%、Als：
0.0220~0.0320%、Mn：0.080~0.090%、S：0.005~0.010%、N：0.006~0.010%、Cu ：0.014~
0.015%、Sn：0.040 ~ 0.042%, Cr and Ni total contents are less than 0.25%, and remaining is Fe and inevitable field trash；
2）Base post-heating is smelted and is casting continuously to form according to mentioned component, and heating-up temperature is at 1150 ~ 1250 DEG C；
3）Jing after conventional hot rolling, two-part normalizing annealing is carried out：First paragraph normalizing steel billet temperature T is according to Als contents in hot rolled coil
It is controlled, and is incubated 20 ~ 30s；Then reduce steel billet temperature and second segment normalizing is proceeded by 890 ~ 910 DEG C, and be incubated 100
~120s；
The span of control of wherein normalizing first paragraph steel billet temperature T is controlled according to following empirical equation：
1182.1-0.400×106×[Als]≤T≤1237.9-0.495×106×[Als]
In above formula：Steel plate observed temperature in the annealing furnace that T represents shown by thermocouple, unit for DEG C；
Als represents the content of Als in steel plate, is multiplied with pure decimal value；
4）Coil of strip state after normalizing is judged：The P of detection steel plate1.1/50Value, and judge the value whether in α≤P1.1/50≤
In the range of β, wherein：
α=10.71×e197.5×[Als]+1.35×D-14×[Si]+0.055；
β=10.95×e158.1×[Als]+1.35×D-14×[Si]+0.055；
In formula：Als represents the content of Als in steel plate, is substituted into pure decimal value and calculate in formula；
Si represents the content of Si in steel plate, is substituted into pure decimal value and calculate in formula；
D represents the thickness of institute's normalizing plate, and unit is：mm；
If P1.1/50In α≤P1.1/50In the range of≤β, then show P1.1/50Meet and require, proceed rear operation；If P1.1/50It is less than
α or P1.1/50More than β, then P is illustrated1.1/50It is abnormal；
5）At 150 ~ 220 DEG C, timeliness is rolling to finished product thickness；
6）Decarburizing annealing is carried out, and C content is controlled in below 10ppm；Nitriding annealing is carried out again, controls final N content 140-
300ppm；
7）Routine is coated magnesium oxide annealing separating agent, final high annealing；Coating tensile coating, stretching and leveling and rear work
Sequence.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105950966B (en) * | 2016-06-23 | 2018-08-10 | 中达连铸技术国家工程研究中心有限责任公司 | Using the method for intrinsic inhibitor method and strand low-temperature heat technique productions Hi-B steel |
| CN106755874B (en) * | 2016-11-18 | 2018-06-26 | 武汉钢铁有限公司 | A kind of decarburization for producing low temperature high magnetic induction grain-oriented silicon steel and nitriding method for annealing |
| CN107460293B (en) * | 2017-08-04 | 2018-10-16 | 北京首钢股份有限公司 | A kind of production method of low temperature high magnetic induction grain-oriented silicon steel |
| CN109628851A (en) * | 2018-12-04 | 2019-04-16 | 武汉钢铁有限公司 | A kind of normalizing production method of low temperature high magnetic induction grain-oriented silicon steel |
| CN110218853B (en) * | 2019-06-26 | 2020-11-24 | 武汉钢铁有限公司 | Process method for preparing low-temperature high-magnetic-induction oriented silicon steel |
| CN115449741B (en) * | 2022-09-20 | 2023-11-24 | 武汉钢铁有限公司 | High-magnetic induction oriented silicon steel produced based on sheet billet continuous casting and rolling and method |
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| CN101775547A (en) * | 2009-12-31 | 2010-07-14 | 武汉钢铁(集团)公司 | Production method of high magnetic induction grain-oriented silicon steel strip |
| CN102127709A (en) * | 2011-01-16 | 2011-07-20 | 首钢总公司 | Low-temperature slab heating high magnetic induction grain-oriented silicon steel and production method thereof |
| EP2832865A1 (en) * | 2012-03-29 | 2015-02-04 | JFE Steel Corporation | Method for manufacturing grain oriented electrical steel sheet |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775547A (en) * | 2009-12-31 | 2010-07-14 | 武汉钢铁(集团)公司 | Production method of high magnetic induction grain-oriented silicon steel strip |
| CN102127709A (en) * | 2011-01-16 | 2011-07-20 | 首钢总公司 | Low-temperature slab heating high magnetic induction grain-oriented silicon steel and production method thereof |
| EP2832865A1 (en) * | 2012-03-29 | 2015-02-04 | JFE Steel Corporation | Method for manufacturing grain oriented electrical steel sheet |
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