CN1986845A - Heat treatment process for medium and small cold rolled silicon steel sheet - Google Patents
Heat treatment process for medium and small cold rolled silicon steel sheet Download PDFInfo
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- CN1986845A CN1986845A CN 200610161268 CN200610161268A CN1986845A CN 1986845 A CN1986845 A CN 1986845A CN 200610161268 CN200610161268 CN 200610161268 CN 200610161268 A CN200610161268 A CN 200610161268A CN 1986845 A CN1986845 A CN 1986845A
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Abstract
The heat treatment process for medium and small cold rolled silicon steel sheet completed in common bell type electric furnace includes the following steps: loading, vacuumizing and filling with nitrogen, heating while introducing nitrogen-hydrogen mixed gas and water vapor to form water vapor diaphragm between silicon steel sheets to avoid adhesion; decarbonizing to form ferrite completely for silicon steel sheet to reach low carbon content, low hysteresis loss and low magnetic resistance; and slowly cooling after decarbonizing for silicon steel sheet to separate out [100] crystal direction ferrite crystal completely under austenitic state so as to increase magnetic conductivity and magnetic flux and lower iron loss P15/50. The said process can reach excellent heat treatment effect, and the treated cold rolled silicon steel sheet can meet the requirement for use in motor.
Description
Technical field
The present invention relates to cold-reduced silicon sheet, relate in particular to the thermal treatment of cold-reduced silicon sheet, be in particular a kind of heat treating method of middle-size and small-size cold-reduced silicon sheet, belong to middle-size and small-size metallurgical processing technical field.
Background technology
In recent years, along with the develop rapidly of household electrical appliance industry, the demand of middle and small motor greatly increases; In automation system, also need to widely apply middle and small motor and micromotor simultaneously.Under this background, the market requirement of siliconized plate raises up significantly.Because common hot rolled silicon steel sheet electromagnetic performance is poor, the electrical efficiency of making is low, and the cold-reduced silicon sheet supply that general big section steel works is produced is tight slightly, and the price height, depends on import at present to a great extent.Produce siliconized plate to satisfy market if adopt the mode of production of big section steel works, not only investment is big---decarburization full annealed operation especially, need to adopt more than 300 meter long continuous annealing furnace, and must continuous production, the annual output scale can not be lower than 1,000,000 tons, otherwise production cost can't bear.On the other hand, as pit furnace machine silicon steel disc adopting, when being warmed up to technology when temperature required, steel disc can produce serious subsides and connect, surface irregularity, and electromagnetic performance is low, can not satisfy the processing request of subsequent product.
Therefore, how middle-size and small-size cold-reduced silicon sheet is carried out effective thermal treatment, having become needs the urgent technical barrier that solves in the industry.
Summary of the invention
The objective of the invention is to overcome the defective that prior art exists, a kind of heat treating method of middle-size and small-size cold-reduced silicon sheet is provided.
Technical solution of the present invention is: the heat treating method of middle-size and small-size cold-reduced silicon sheet is characterized in that comprising following steps:
1. with driving flat-bed machine cold-reduced silicon sheet is cut into middle-size and small-size specification, in the bell jar stove of packing into behind the heap frame;
2. vacuumize earlier in the stove, then inflated with nitrogen;
3. heat up, 0 ℃～510 ℃ heat-up rates are 80 ℃～90 ℃/hour, and 550 ℃～810 ℃ heat-up rates are 20 ℃～25 ℃/hour;
4. fully be incubated more than 6 hours down at 810～820 ℃;
5. furnace cooling, 810 ℃～650 ℃ cooling rates are controlled at 5 ℃～10 ℃/hour, and 650 ℃～500 ℃ cooling rates are controlled at 10 ℃～15 ℃/hour;
Vacuumize earlier when 6. cooling to 100 ℃, put into air then;
7. come out of the stove below 100 ℃.
The further technical solution that realizes the object of the invention is:
The heat treating method of aforesaid middle-size and small-size cold-reduced silicon sheet, wherein, 3. step had been warming up to before 150 ℃, fed dry hydrogen and water vapor in stove simultaneously.
Again further, the heat treating method of aforesaid middle-size and small-size cold-reduced silicon sheet, wherein, step 3.～step 5. in the middle of, from being warmed up to 450 ℃ of beginnings until be cooled to 650 ℃, in stove, feed wet hydrogen, the ratio of hydrogen partial pressure and steam partial pressure is 0.5～1 in the middle of the control wet hydrogen.
Further, the heat treating method of aforesaid middle-size and small-size cold-reduced silicon sheet, wherein, step 5. in the middle of, change the cold wind cover when being cooled to 450 ℃ earlier and carry out air-cooledly, when further being cooled to 300 ℃, change water-cooled again.
Like this, the present invention adopts common bell-jar electric furnace, vacuumizes after shove charge, inflated with nitrogen, feeds nitrogen, hydrogen gas mixture during intensification, feeds water vapor again, forms steam and make between siliconized plate sheet and the sheet and form barrier film in stove, keeps non-caked; Simultaneously, a step decarburization forms whole ferrites in the stove hall, stops cementite, makes siliconized plate can really reach Ultra-low carbon, reduces hysteresis loss and reduces magnetic resistance.Decarburization finishes, and under fully slow cooling conditions, makes siliconized plate separate out the ferrite crystal in [100] crystal orientation fully under austenitic state, thereby increases magnetic permeability mu, increases magnetic flux B, reduces iron loss P
15/ 50.This technical scheme thermal effectiveness is good, and the siliconized plate that makes satisfies the processing request of middle and small motor fully.
Embodiment
The present invention relates to middle-size and small-size metallurgical processing technical field, is that precooling ordinary silicon steel band is carried out rational decarburization, and recrystallize thermal treatment is in the hope of obtaining the high-performance non-directional cold-rolling silicon steel disc of low magnetic resistance, high magnetic flux, low iron loss, the production needs of small machine in satisfying.
A kind of typical implementation process of the present invention is:
(1) is cut into 2 meters long sizes with the 50WW560 cold coiling that enters factory by driving flat-bed machine, piles up on the shelf high about 270mm, make siliconized plate form arc by its state of nature basically,, prevent to paste knot to reduce the pressure between cold coiling sheet and the sheet.
(2) skid bed is packed in the bell jar stove, vacuumize back inflated with nitrogen earlier.
(3) begin to heat up, logical simultaneously decomposed ammonia (dry hydrogen), and feed an amount of water vapor, until 150 ℃.Heat-up rate is: in 0 ℃～510 ℃ scopes, and 85 ℃/hour; In 550 ℃～810 ℃ scopes, 25 ℃/hour.Feed dry hydrogen and be on the one hand the strong convection motor ponding not that is used to protect furnace bottom, main protection not oxidation of siliconized plate and derusting, its reaction principle is---
Fe
2O
3+3H
2→2Fe+H
2O
(4) fully be incubated 8 hours under 810 ℃ of temperature, make the whole austenitizings of siliconized plate, irregular lattice in the siliconized plate cold-rolled process and the elements such as silicomanganese in the steel can fully and equably be fused in the austenite in this process.
(5) water flowing steam.Begin to feed wet hydrogen to being cooled to 650 ℃ in stove from being warmed up to 450 ℃, the ratio of hydrogen partial pressure and steam partial pressure is 0.5～1 in the middle of the control wet hydrogen, and with protection not oxidation of siliconized plate and derust, the while can also be played the decarburization effect, and its reaction principle is---
C+H
2O→CO+H
2
Can further reduce the carbon content of siliconized plate like this, make siliconized plate can really reach Ultra-low carbon, reduce hysteresis loss and reduce magnetic resistance.According to detection, this step can make the carbon content of siliconized plate reduce to 0.04% from 0.08%.
(6) furnace cooling.Between 810 ℃～650 ℃, cooling rate is controlled at 5 ℃～10 ℃/hour; Between 650 ℃～500 ℃, cooling rate is controlled at 10 ℃～15 ℃/hour.Such temperature-fall period helps making siliconized plate homogeneously crystallized, and the overwhelming majority is to arrange by [100] crystal orientation.
Change the cold wind cover when (7) cooling to 450 ℃ and carry out air-cooledly, when further being cooled to 300 ℃, changing water-cooled and cool off fast.
Vacuumize when (8) being cooled to 100 ℃, put into air then.The purpose that vacuumizes is to prevent residual hydrogen in the stove, with blast protection.
Come out of the stove below (9) 100 ℃, can obtain the smooth siliconized plate of surface-brightening.After testing, its magnetic flux B50 is 1.6～1.7, iron loss P
15/ 50 is 5.1～5.9W/Kg.
As seen, the present invention has solved well in the prior art that " become thermal process must scale especially big, general medium-sized and small enterprises be can not enter; And if adopt general pit furnace, can not produce qualified product again " contradiction, formed the thermal treatment process route of a practicable middle-size and small-size cold-reduced silicon sheet.Its technical characterstic finds full expression in following several respects:
1, this method adopts common bell-jar electric furnace, and equipment interoperability is strong, is suitable for the processing of general medium and small sized enterprises, reduced investment, take up an area of less, instant effect;
2, adopt rare gas element nitrogen and reducing gas hydrogen, make siliconized plate under 810 ℃ of high temperature, keep not oxidation.In the heat treatment process, water-filling steam in the stove makes siliconized plate at high temperature form steam film between sheet simultaneously, non-caked between siliconized plate sheet and the sheet, and oxygen in the water vapor and the trace carbon in the siliconized plate produce oxidation and decarbonization, have further reduced the carbon content in the siliconized plate;
3, adopt rational process of cooling, make siliconized plate under austenitic state, separate out completely the ferrite crystal in [100] crystal orientation, help increasing magnetic conductance, reduce hysteresis loss.
Certainly, described above only is a kind of prominent example of technical solution of the present invention, and protection scope of the present invention is not constituted any limitation.All operational condition is equal to replacement or equivalent transformation and the technical scheme that forms, all drops within the claim protection domain of the present invention.
Claims (4)
1. the heat treating method of middle-size and small-size cold-reduced silicon sheet is characterized in that comprising following steps:
1. with driving flat-bed machine cold-reduced silicon sheet is cut into middle-size and small-size specification, in the bell jar stove of packing into behind the heap frame;
2. vacuumize earlier in the stove, then inflated with nitrogen;
3. heat up, 0 ℃～510 ℃ heat-up rates are 80 ℃～90 ℃/hour, and 550 ℃～810 ℃ heat-up rates are 20 ℃～25 ℃/hour;
4. fully be incubated more than 6 hours down at 810～820 ℃;
5. furnace cooling, 810 ℃～650 ℃ cooling rates are controlled at 5 ℃～10 ℃/hour, and 650 ℃～500 ℃ cooling rates are controlled at 10 ℃～15 ℃/hour;
Vacuumize earlier when 6. cooling to 100 ℃, put into air then;
7. come out of the stove below 100 ℃.
2. the heat treating method of middle-size and small-size cold-reduced silicon sheet according to claim 1, it is characterized in that: 3. step had been warming up to before 150 ℃, fed dry hydrogen and water vapor in stove simultaneously.
3. the heat treating method of middle-size and small-size cold-reduced silicon sheet according to claim 1, it is characterized in that: step 3.～step 5. in the middle of, from being warmed up to 450 ℃ of beginnings until be cooled to 650 ℃, in stove, feed wet hydrogen, the ratio of hydrogen partial pressure and steam partial pressure is 0.5～1 in the middle of the control wet hydrogen.
4. according to the heat treating method of claim 1 or 2 or 3 described middle-size and small-size cold-reduced silicon sheets, it is characterized in that: step 5. in the middle of, change the cold wind cover when being cooled to 450 ℃ earlier and carry out air-cooledly, when further being cooled to 300 ℃, change water-cooled again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610161268 CN1986845A (en) | 2006-12-18 | 2006-12-18 | Heat treatment process for medium and small cold rolled silicon steel sheet |
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|---|---|---|---|
| CN 200610161268 CN1986845A (en) | 2006-12-18 | 2006-12-18 | Heat treatment process for medium and small cold rolled silicon steel sheet |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866113A (en) * | 2014-02-18 | 2014-06-18 | 燕山大学 | Charging optimizing method for preventing bonding of steel coils during cover annealing |
| CN107385178A (en) * | 2017-07-18 | 2017-11-24 | 浙江华赢特钢科技有限公司 | A kind of annealing process of improved non-directional cold-rolling silicon steel disc |
| CN109120116A (en) * | 2018-09-14 | 2019-01-01 | 临安泰华机械设备有限公司 | A kind of stator processing technique |
-
2006
- 2006-12-18 CN CN 200610161268 patent/CN1986845A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866113A (en) * | 2014-02-18 | 2014-06-18 | 燕山大学 | Charging optimizing method for preventing bonding of steel coils during cover annealing |
| CN107385178A (en) * | 2017-07-18 | 2017-11-24 | 浙江华赢特钢科技有限公司 | A kind of annealing process of improved non-directional cold-rolling silicon steel disc |
| CN109120116A (en) * | 2018-09-14 | 2019-01-01 | 临安泰华机械设备有限公司 | A kind of stator processing technique |
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