CN104726651B - A kind of normalizing method improving common orientation silicon steel lumber recovery - Google Patents
A kind of normalizing method improving common orientation silicon steel lumber recovery Download PDFInfo
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- CN104726651B CN104726651B CN201310719584.3A CN201310719584A CN104726651B CN 104726651 B CN104726651 B CN 104726651B CN 201310719584 A CN201310719584 A CN 201310719584A CN 104726651 B CN104726651 B CN 104726651B
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Abstract
The present invention discloses a kind of normalizing method improving common orientation silicon steel lumber recovery, and 1) first paragraph shrend: uniformly spraying 900～950 DEG C of steel plate upper and lower surfaces with 20～80 DEG C of water, the control of shrend time is 20～30s；2) temper: steel billet temperature gos up after 400～600 DEG C, in air atmosphere, is incubated 20～35s；3) second segment shrend: uniformly spraying steel plate upper and lower surface with 20～40 DEG C of water, the control of shrend time is 5～20s.The present invention is easy to operate, it is easy to accomplish；Can effectively decompose martensitic structure brittle in normalizing plate, thus significantly reduce rolling broken belt rate, improve lumber recovery；Final magnetic property change is little.
Description
Technical field
The present invention relates to the heat treatment method of orientation silicon steel, the especially common orientated silicon of a kind of raising
The normalizing method of steel lumber recovery.
Background technology
Orientation silicon steel is a kind of siliceous soft magnetic materials of about 3%, and its strong goss texture makes steel plate
Roll to the excellent magnetic characteristic with low iron loss, high magnetic strength, be widely used in transformator and large-scale generating
Machine industry.
The difficult point producing orientation silicon steel is cold rolling, and cold-rolled process easily broken belt has a strong impact on
Production efficiency and lumber recovery.Previous studies is concentrated mainly on element silicon, increases with silicon amount,
Intensity and the hardness of steel are gradually increased, and brittle transition temperature is also increased to 20～50 DEG C[2], make
Become rolling difficulty.In order to reduce rolling broken belt problem, production use steam or edge flame add
Hot device is the most cold rolling after heating coil of strip, can effectively avoid orientation silicon steel brittle transition temperature,
Reduce cold rolling broken belt rate to a certain extent, but total broken belt rate is the highest, the most often
The coil of strip of annealing, after using said method to process, broken belt problem does not significantly improve.
Summary of the invention
The present invention provides a kind of normalizing method improving common orientation silicon steel lumber recovery, at oriented silicon
After steel normalizing annealing Water Quenching, by using high tempering processing mode to reduce normalizing plate tissue
In martensitic structure, make normalizing roll up cold rolling broken belt rate significantly reduce, lumber recovery improve.
For achieving the above object, the present invention takes techniques below scheme:
1, composition design
The present invention is applicable for use with the common orientation silicon steel that normalizing annealing processes, and composition is shown in Table 1.
The common orientation silicon steel composition Wt% that table 1 present invention is suitable for
| C | Si | Mn | P | S | Als | N | Fe |
| 0.03～0.06 | 2.8～3.4 | 0.05～0.10 | 0.01～0.02 | 0.02～0.03 | 0.015～0.030 | 0.005～0.009 | Surplus |
2, process system
After conventional normalizing process requires to be heated to 1100～1150 DEG C of held for some time, air cooling arrives
900～950 DEG C, shrend again after then direct-water-quenching, or insulation 120～250s.Shrend is one section
Formula cools down, i.e. by spraying water or quenching in 100 DEG C of water, make steel plate be cooled fast to 100 DEG C
Below.Steel billet temperature can be made quickly to reduce by shrend, thus separate out during keeping normalizing
Second phase particles small and dispersed, can effectively suppress first crystal grain to grow up, and promotes subgrain development,
To being formed, the orientation silicon steel having excellent magnetic characteristics is favourable.Examine by this normalizing plate being carried out tissue
Surveying, find to there is more martensitic structure in steel plate, martensite is hard and crisp, in the operation of rolling
Broken, it is easily generated stress at broken martensite and concentrates, thus cause strip breakage.Conventional
Normalizing and normalizing process system of the present invention are as shown in Fig. 1 and Fig. 2, it can be seen that the present invention is with often
The difference of rule normalizing process system is mainly in follow-up shrend section.
The present invention uses two-part water quenching and combines high tempering process, is reduced or eliminated first
The martensitic structure that section shrend produces, concrete technology is as follows:
(1) first paragraph shrend
Uniformly spraying 900～950 DEG C of steel plate upper and lower surfaces with 20～80 DEG C of water, the shrend time is controlled
It is made as 20～30s.It is higher that the first paragraph shrend time controls requirement, when water temperature is higher, and shrend
Time then requires relatively long, otherwise, when water temperature is relatively low, the shrend time is the most relatively short.
The shrend time can not be less than 20s, and otherwise steel billet temperature can be higher than 600 DEG C, and cooling procedure is formed
The second phase particles of small and dispersed distribution Ostwald ripening can be occurred to grow up, thus affect
The secondary recrystallization of orientation silicon steel and magnetic property；The shrend time can not be more than 30s, otherwise steel
Plate temperature can be less than 400 DEG C, it is impossible to quenched nickelclad is carried out effective temper.
When Water spray front spring temperature is higher, it is desirable to cooler-water temperature is toward lower limit control, or shrend
Time is toward upper limit control；Otherwise, when steel billet temperature is relatively low, cooler-water temperature toward upper limit control,
Or the shrend time is toward lower limit control.Main purpose is to control surface of steel plate temperature can go back up to
400～600 DEG C.
(2) temper
The temper of the present invention need not additionally increase firing equipment, after first paragraph shrend, and steel
Plate surface temperature reduces rapidly, but due to shrend limited time, steel plate central core temperature is the most relatively
Height, central core heat passes to surface of steel plate by heat exchange pattern, makes surface temperature go back up to
400～600 DEG C.Steel billet temperature gos up after 400～600 DEG C, in air atmosphere, and insulation
20～35s.Steel plate is high tempering the tempering of 400～600 DEG C, makes the geneva formed during shrend
Soma decomposes, and the tempered sorbite of formation has excellent toughness and plasticity, such that it is able to have
Effect reduces the rolling broken belt problem caused due to martensite.When temperature retention time is less than 20s, tempering
Treatment effect is inconspicuous, and when temperature retention time is higher than 35s, on the one hand steel billet temperature can be reduced to 400
Below DEG C, on the other hand, it is desirable to normalizing cooling section length increases.
In this temperature range, in steel plate, second phase particles can not occur Ostwald ripening, because of
This, the second phase particles in steel plate remains in that normalizing annealing process small and dispersed distribution.
Meanwhile, when this temperature range is incubated, may additionally facilitate more tiny second phase particles and separate out, to shape
Cheng Weixiang Goss texture accurately, raising product magnetic property are favourable.
(3) second segment shrend
Uniformly spraying steel plate upper and lower surface with 20～40 DEG C of water, the control of shrend time is 5～20s,
By second segment shrend, it is ensured that steel billet temperature is reduced to less than 100 DEG C.Cooling now is the most not
The formation of martensitic structure can be caused.
The present invention is easy to operate, it is easy to accomplish；Can effectively decompose martensite brittle in normalizing plate
Tissue, thus significantly reduce rolling broken belt rate, improve lumber recovery；Final magnetic property change is little.
Accompanying drawing explanation
Fig. 1 is prior art routine normalizing process system figure；
Fig. 2 is normalizing process system figure of the present invention.
Detailed description of the invention
1, composition
Composition is shown in Table 2.
The orientation silicon steel composition Wt% of table 2 embodiment of the present invention
| C | Si | Mn | P | S | Als | N | Fe |
| 0.05 | 3.27 | 0.075 | 0.013 | 0.027 | 0.021 | 0.0065 | Surplus |
2, normalizing process
The embodiment of the present invention only changes normalizing process, and other procedure technologies are constant.Normalizing quenches
Technique: 907～948 DEG C of normalizing annealing plate first paragraph shrends 20～30s, cooling water temperature is 20～80
℃；Insulation 23～33s in air atmosphere；Second segment shrend 8～18s, cooling water temperature is
30～33 DEG C.
3, result
Broken belt number of times when coil of strip is rolled and final hot-stretch formation plate (0.30mm) magnetic
Can be added up, be the results are shown in Table 3 and table 4.Can be seen that, use two-part water quenching to have
Effect reduces broken belt rate.When steel plate temper temperature is relatively low, rolling broken belt number of times increased,
But it is little on magnetic property impact.
Table 3 coil of strip rolling broken belt number of times and final magnetic property (normalizing+secondary cold-rolling method)
Claims (1)
1. the normalizing method improving common orientation silicon steel lumber recovery, it is characterised in that comprise the steps: 1) the
One section of shrend: uniformly spray 900～950 DEG C of steel plate upper and lower surfaces with 20～80 DEG C of water, the shrend time controls
It is 20～30s；2) temper: steel billet temperature gos up after 400～600 DEG C, in air atmosphere, protects
Temperature 20～35s；3) second segment shrend: uniformly spray steel plate upper and lower surface, shrend time with 20～40 DEG C of water
Control is 5～20s；The composition of described steel is C0.03～0.06, Si2.8～3.4 by weight percentage,
Mn0.05～0.10, P0.01～0.02, S0.02～0.03, Als0.015～0.030, N0.005～0.009,
Surplus is Fe and inevitable impurity.
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| CN201310719584.3A CN104726651B (en) | 2013-12-23 | 2013-12-23 | A kind of normalizing method improving common orientation silicon steel lumber recovery |
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| CN201310719584.3A CN104726651B (en) | 2013-12-23 | 2013-12-23 | A kind of normalizing method improving common orientation silicon steel lumber recovery |
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| CN104726651A CN104726651A (en) | 2015-06-24 |
| CN104726651B true CN104726651B (en) | 2016-11-16 |
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Citations (4)
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|---|---|---|---|---|
| CN1796587A (en) * | 2004-12-27 | 2006-07-05 | 宝山钢铁股份有限公司 | Orientating silicon steel, manufacturing process and equipment |
| 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 |
| CN102477483A (en) * | 2010-11-26 | 2012-05-30 | 宝山钢铁股份有限公司 | Method for producing oriented silicon steel with excellent magnetic property |
| CN102534364A (en) * | 2010-12-17 | 2012-07-04 | 鞍钢股份有限公司 | Production method capable of improving magnetic property of common grain-oriented silicon steel |
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2013
- 2013-12-23 CN CN201310719584.3A patent/CN104726651B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1796587A (en) * | 2004-12-27 | 2006-07-05 | 宝山钢铁股份有限公司 | Orientating silicon steel, manufacturing process and equipment |
| 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 |
| CN102477483A (en) * | 2010-11-26 | 2012-05-30 | 宝山钢铁股份有限公司 | Method for producing oriented silicon steel with excellent magnetic property |
| CN102534364A (en) * | 2010-12-17 | 2012-07-04 | 鞍钢股份有限公司 | Production method capable of improving magnetic property of common grain-oriented silicon steel |
Non-Patent Citations (3)
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| Fe-3.15%Si低温取向硅钢不同常化工艺下的组织及析出相研究;李慧 等;《金属学报》;20130511;第49卷(第5期);第562-568页 * |
| 薄板坯连铸连轧流程Fe-3%Si钢热轧板和常化板织构;李长生 等;《河南冶金》;20100831;第18卷(第4期);第9-13、19页 * |
| 高磁感取向硅钢常化处理过程中氮化物的沉淀;蒙肇斌 等;《特殊钢》;19990228;第20卷(第1期);第24-26页 * |
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