CN1858269A - Annealing treating process for cold rolled steel coil - Google Patents
Annealing treating process for cold rolled steel coil Download PDFInfo
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- CN1858269A CN1858269A CN 200510046495 CN200510046495A CN1858269A CN 1858269 A CN1858269 A CN 1858269A CN 200510046495 CN200510046495 CN 200510046495 CN 200510046495 A CN200510046495 A CN 200510046495A CN 1858269 A CN1858269 A CN 1858269A
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- temperature
- annealing
- rolled steel
- steel roll
- cold rolled
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- 238000000137 annealing Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000010960 cold rolled steel Substances 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- 238000010622 cold drawing Methods 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000001953 recrystallisation Methods 0.000 description 5
- 230000004523 agglutinating effect Effects 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000006664 bond formation reaction Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The present invention relates to heat treatment of metallurgical product, and is especially one annealing treatment process for cold rolled steel coil in the cover furnace. Technologically, the present invention features the high maintaining temperature difference and temperature lowering and maintaining control. That is, the annealing treatment process has raised annealing temperature below the phase change line, increased temperature difference between inside and outside the steel roll, prolonged time with steel roll outer temperature lower than the steel roll core temperature, lowering the steel roll core temperature in the later temperature maintaining stage to lower the pressure stress inside the steel roll to avoid sticking fault. The present invention has raised annealing quality and output.
Description
Technical field
The invention belongs to the metallurgic product thermal treatment process, particularly cold-rolled steel coils cover annealing treatment process.
Background technology
In the cold-reduced sheet production process of smelter, roll the after annealing production process that is absolutely necessary one, and the bonding that the annealing back produces is one of major defect that influences the product lumber recovery.According to certain factory's condition of production statistics, the bonding rate generally accounts for the 0.4%-2% of product population, calculates by producing 1000000 tons of steel per year, and the waste product that produces because of boning is up to 4000 tons-20000 tons every year on average.
At present, cold rolling mill adopts traditional reduction holding temperature and band cover refrigerative treatment process usually at home.As all adopting 700 ℃ of annealing, soaking time to reach 30-40 hour to deep drawing steel etc., the temperature difference is between 0 ℃-3 ℃.To stamped steel and general Primary Steel even adopt 690 ℃, 680 ℃ annealing, the annealing soaking time all reaches 20-30 hour, and the temperature difference is less than 15 ℃-30 ℃.The result who reduces holding temperature reduces the temperature difference of annealing temperature and steel plate recrystallization temperature, has also reduced the motivating force of metal recrystallize simultaneously, causes recrystallize slow.Therefore, adopt the prolongation soaking time to finish recrystallization process usually.But from control agglutinating angle, because the coil of strip internal-external temperature difference reduced when insulation finished, in process of cooling subsequently, coil of strip outside temperature in 10-20 minute promptly is reduced to below the coil of strip internal temperature, and coil of strip heart portion temperature causes coil of strip heart portion to continue to expand owing to thermal inertia continues to rise; The bonding formation time section of cold-rolled steel coils just between this temperature to 620 ℃, consequent thermal stresses has strengthened agglutinating proneness.Therefore, can cause negative influence greater than 660 ℃ steel, more seriously reduce heat treated production capacity, thereby cause producing the platform cover, will directly influence the quality of product and the output of steel mill than overbalance to recrystallization temperature.
Summary of the invention
In order to overcome the deficiencies in the prior art, reduce cold-rolled steel coils because of the back of annealing produces the scrap rate that bonding causes, improve the quality of products and production capacity, the invention provides a kind of annealing treating process for cold rolled steel coil.By the temperature variation of bonding sensitive area, different steel grades temperature distribution, recrystallization temperature and the insulation in heat-treatment of annealing process end back is carried out theoretical calculation analysis and correction, released a kind of annealing technology that reduces the bonding tendency from the opposite angle of tradition annealing theory.Its major technique feature is to adopt the thermal treatment process of the high insulation temperature difference and cooling preservation and controlling.
High insulation temperature difference technology is to adopt the method that is incubated the temperature difference (temperature difference of controlled temperature and steel roll temperature) when finishing that strengthens.Promptly improving annealing controlled temperature (the coil of strip recrystallization temperature is constant), control this temperature below phase change line in, the coil of strip heart portion temperature when reducing insulation and finishing.Adopt this treatment process, the bigger temperature difference of the inside and outside existence of coil of strip can prolong the time that the coil of strip outside temperature is lower than the heart portion temperature when insulation finished.According to Theoretical Calculation, when heart portion temperature was lower than 620 ℃, the stress of coil of strip inside can be reduced to below the theoretical cementing value.So prolong this section period, can make that the coil of strip outside temperature is higher than coil of strip heart portion temperature all the time in this temperature range, can guarantee that like this coil of strip outside temperature is lower than coil of strip heart portion temperature within this temperature section 1.5-2.5 hour, prevent to produce bigger stress.Simultaneously,, shortened the heating mantles holding time, improved the production capacity of annealing table and the production capacity of heating mantles owing to improved the temperature difference.
In addition, in the mechanical properties of steel plate, the crystal grain that steel plate formed after long soaking time was unfavorable for annealing on the contrary has the equiax crystal of ideal length and width ratio, suitably reduces the annealing equivalent and has improved mechanical property on the contrary.
Cooling preservation and controlling technology is to take the cooling cooling on the technology that reduces the coil of strip internal compressive stress, promptly on the basis that does not stop to heat, adopt temperature lowering curve, key is to prevent in the later stage coil of strip heart portion temperature that is incubated because diversified in specifications the causing of coil of strip of stacking, volume and volume heart portion temperature disunity, hot rolling heart portion temperature meets or exceeds holding temperature.The key of this technology is the extreme value time corresponding that calculates coil of strip heart portion temperature in theory, begins cooling at this time point, and it is zero that speed is calculated as the derivative that keeps the steel roll temperature velocity of variation.
When adopting above-mentioned two kinds of technologies, cooperate the cooling of band cover can realize the present invention.The band cover is cooled to common measure of control, guarantees that generally steel roll temperature is reduced to below 580 ℃.
The present invention compares with prior art has following advantage:
1. reduce cold-rolled steel coils bonding defect incidence, fallen 0.38% on a year-on-year basis, reduced quality cost thus significantly;
2. improve output 8-15%;
3. the heating mantles utilization ratio improves 18-22%.
Description of drawings
Fig. 1 is incubated and finishes back coil of strip difference curve
Fig. 2 improves insulation temperature difference annealing theory synoptic diagram
Embodiment
Below in conjunction with accompanying drawing the present invention is described in detail.
As can be seen from Figure 2, the control temperature difference D of coil of strip outside temperature A and the temperature B of coil of strip heart portion when being incubated end by strengthening, can prolong coil of strip outside temperature A and be lower than the time T of the temperature B of coil of strip heart portion, make ideal coil of strip heart temperature B of portion and coil of strip outside temperature A intersect pairing temperature E point of time and be near or below the C point, the controlled temperature line promptly bond in theory below 620 ℃, can effectively reduce and produce the agglutinating tendency.Improve the control temperature difference D of steel roll temperature, on the basis that guarantees the abundant recrystallize of coil of strip, improve the production capacity of heating mantles and table.Unfavorable coil of strip heart temperature F of portion and coil of strip outside temperature A intersect at the G point, and G point temperature is higher than 620 ℃ of theoretical safety lines, and coil of strip heart portion temperature begins to be higher than controlled temperature after crossing the G point, and bonding has a big risk to be increased greatly.
By technology provided by the invention, adopt bell furnace to handle each kind cold-rolled steel coils, it is as follows specifically to implement parameter:
1. improve business level cold drawing, punch level cold drawing and deep-draw cold drawing controlled temperature by 710 ℃ to the phase change line;
2. the temperature difference of deep-draw cold drawing controlled temperature and steel roll temperature is between 20 ℃-35 ℃, and heating and soaking time were at 25-30 hour;
3. the temperature difference of punch level cold drawing controlled temperature and steel roll temperature is between 50 ℃-60 ℃, and heating and soaking time were at 20-25 hour;
4. the temperature difference of business level cold drawing controlled temperature and steel roll temperature is between 100 ℃-70 ℃, and heating and soaking time were at 15-19 hour;
5. the control steel roll temperature began the cooling cooling in 3-1 hour before insulation.
Claims (5)
1. an annealing treating process for cold rolled steel coil is used the bell-type furnace zone cover type of cooling; Its major technique feature is to adopt the high heat treating regime that is incubated the temperature difference and cooling preservation and controlling, and the controlled temperature of will annealing is brought up to 710 ℃ between the transformation temperature, and the coil of strip heart portion temperature when reducing the insulation end is below 620 ℃.
2. annealing treating process for cold rolled steel coil according to claim 1, the temperature difference that its major technique feature is deep-draw cold drawing controlled temperature and steel roll temperature are between 20 ℃-35 ℃, and heating and soaking time were at 25-30 hour.
3. annealing treating process for cold rolled steel coil according to claim 1, the temperature difference that its major technique feature is punch level cold drawing controlled temperature and steel roll temperature are between 50 ℃-60 ℃, and heating and soaking time were at 20-25 hour.
4. annealing treating process for cold rolled steel coil according to claim 1, the temperature difference that its major technique feature is business level cold drawing controlled temperature and steel roll temperature are between 100 ℃-70 ℃, and heating and soaking time were at 15-19 hour.
5. annealing treating process for cold rolled steel coil according to claim 1, its major technique feature are that the control steel roll temperature began the cooling cooling in 3-1 hour before insulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510046495 CN1858269A (en) | 2005-05-20 | 2005-05-20 | Annealing treating process for cold rolled steel coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510046495 CN1858269A (en) | 2005-05-20 | 2005-05-20 | Annealing treating process for cold rolled steel coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1858269A true CN1858269A (en) | 2006-11-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510046495 Pending CN1858269A (en) | 2005-05-20 | 2005-05-20 | Annealing treating process for cold rolled steel coil |
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| Country | Link |
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| CN (1) | CN1858269A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101974677A (en) * | 2010-11-09 | 2011-02-16 | 南京钢铁股份有限公司 | Online concurrent heating annealing process of round steel bars and production line thereof |
| CN102125931B (en) * | 2010-01-12 | 2012-11-21 | 宝山钢铁股份有限公司 | Hot rolling production method for 400 series stainless steel coils |
| CN103071982A (en) * | 2013-01-31 | 2013-05-01 | 西南铝业（集团）有限责任公司 | Aluminum coil processing technic |
| CN113337685A (en) * | 2021-06-22 | 2021-09-03 | 新疆八一钢铁股份有限公司 | Cover-removing production process without cover-carrying time |
-
2005
- 2005-05-20 CN CN 200510046495 patent/CN1858269A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102125931B (en) * | 2010-01-12 | 2012-11-21 | 宝山钢铁股份有限公司 | Hot rolling production method for 400 series stainless steel coils |
| CN101974677A (en) * | 2010-11-09 | 2011-02-16 | 南京钢铁股份有限公司 | Online concurrent heating annealing process of round steel bars and production line thereof |
| CN101974677B (en) * | 2010-11-09 | 2011-12-07 | 南京钢铁股份有限公司 | Online concurrent heating annealing process of round steel bars and production line thereof |
| CN103071982A (en) * | 2013-01-31 | 2013-05-01 | 西南铝业（集团）有限责任公司 | Aluminum coil processing technic |
| CN103071982B (en) * | 2013-01-31 | 2015-04-29 | 西南铝业（集团）有限责任公司 | Aluminum coil processing technique |
| CN113337685A (en) * | 2021-06-22 | 2021-09-03 | 新疆八一钢铁股份有限公司 | Cover-removing production process without cover-carrying time |
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Open date: 20061108 |