CN203569155U - Device for thermally stretching band steel in continuous annealing furnace - Google Patents
Device for thermally stretching band steel in continuous annealing furnace Download PDFInfo
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- CN203569155U CN203569155U CN201320713884.6U CN201320713884U CN203569155U CN 203569155 U CN203569155 U CN 203569155U CN 201320713884 U CN201320713884 U CN 201320713884U CN 203569155 U CN203569155 U CN 203569155U
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 85
- 239000010959 steel Substances 0.000 title claims abstract description 85
- 238000000137 annealing Methods 0.000 title claims abstract description 34
- 238000002791 soaking Methods 0.000 claims abstract description 16
- 238000010583 slow cooling Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 229910052755 nonmetal Inorganic materials 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 2
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 2
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 2
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 2
- 239000010962 carbon steel Substances 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 238000001953 recrystallisation Methods 0.000 abstract description 7
- 238000005482 strain hardening Methods 0.000 abstract description 6
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 230000035882 stress Effects 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000032683 aging Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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Abstract
The utility model relates to a device for thermally stretching band steel in a continuous annealing furnace. A preheating section, a heating section, a soaking section and a slow cooling section are formed in the annealing furnace; the soaking section or the slow cooling section is provided with a stretching area; the stretching area is provided with a tension stretching roller I (4), a tension stretching roller II (5) and 2-20 tension rollers; 1-10 tension rollers are positioned in front of the tension stretching roller I; 1-10 tension rollers are positioned behind the tension stretching roller II; the gap between the tension stretching rollers I and II is 5-5000 millimeters. The band steel enters the continuous annealing furnace, and passes through the preheating section, the heating section, the soaking section and the slow cooling section in the atmosphere of shielding gas to be annealed; the soaking section or the slow cooling section is provided with the stretching area, the stretching area is provided with the tension stretching roller I, the tension stretching roller II and the 2-20 tension rollers; the gap between the tension stretching rollers I and II tension stretching roller is 5-5000 millimeters; the band steel is thermally stretched in the soaking section or the cooling section, and is lengthened uniformly by using the speed difference of the tension stretching rollers before and after thermal stretching, so that the band steel is flattened and thinned at a temperature higher than a recrystallization temperature; the thermal stretching temperature is 650-950 DEG C, and the elongation percentage of the band steel thermally stretched as required is 0-50 percent. The device can be used for improving the mechanical property of the annealed band steel, avoiding work hardening and residual stress due to cold-state stretching and flattening, simplifying the continuous annealing flow of the band steel and lowering the equipment investment and operation cost.
Description
Technical field
The utility model belongs to metal heat treatmet and metal hot processing field, relates to a kind of device with steel thermal stretch in continuous annealing furnace.
Background technology
Because processing is inhomogeneous, more or less all can there is the uneven phenomenon of plate shape in band steel, cold rolled strip is thinner when cold rolling, and the uneven degree of its plate shape may be more serious.Generally all will be by cold conditions stretching-bending straightener group, to carrying out the tensile deformation under normal temperature with steel, with leveling belt plate shape after the annealing of band steel is cooling.In this process, along with band steel is elongated, with steel inside, producing inhomogeneous work hardening and inhomogeneous internal stress.The steel plate of cold deformation post-hardening is in unsettled high free energy state, have towards the trend of the spontaneous reply of low free energy state before cold deformation, therefore, this band steel is shelved through certain hour, or run into the situation that temperature is higher, will spontaneously reply, reappear cold deformation uneven plate shape state before.This is one of ageing of metal phenomenon.
With steel yield strength at normal temperatures at 10～50kg/mm
2above, be that it is at 5～10 times of recrystallization temperature lower yield strength.Very difficult with steel stretching at normal temperatures, and can cause work hardening and the residual stress with steel.Under normal temperature with the stretch-bend leveller method of steel only for its plate shape of leveling, and quantitative attenuate cannot be larger for unit elongation time.
Summary of the invention
The purpose of this utility model is to provide a kind of device with steel thermal stretch in continuous annealing furnace, improves the plate shape with steel, and can make to be with steel to realize quantitative attenuate in 0～50% unit elongation scope under the prerequisite of avoiding with steel generation work hardening and unrelieved stress.
The device of the utility model band steel thermal stretch in continuous annealing furnace, comprises annealing furnace, is provided with preheating section, heating zone, soaking zone and slow cooling section in annealing furnace.Soaking zone or slow cooling section are provided with drawing zone, and drawing zone is provided with No. 1 tension force stretching roller, No. 2 tension force stretching rollers and 2～20 tensioning rollers.Before 1～10 tensioning roller is positioned at No. 1 tension force stretching roller, after 1～10 tensioning roller is positioned at No. 2 tension force stretching rollers.Gap between No. 1 tension force stretching roller and No. 2 tension force stretching rollers is 5～5000mm.
Region with steel between No. 1 tension force stretching roller and No. 2 tension force stretching rollers is tensile deformation district, and tensile deformation section length is 5～5000mm.The material of No. 1 tension force stretching roller, No. 2 tension force stretching rollers and tensioning roller is heating resisting metal or heatproof nonmetal.Heating resisting metal comprises that Cr25Ni20Si2 is ZG3Cr24Ni7NRe, and heatproof nonmetal is quartz-ceramics.Texturing processing is carried out on No. 1 tension force stretching roller, No. 2 tension force stretching rollers and tensioning roller surface, increases its surfaceness.Band ladle is drawn together carbon steel, steel alloy, stainless steel, silicon steel and iron alloy.
Method with steel thermal stretch in continuous annealing furnace is that band steel enters continuous annealing furnace, in the atmosphere of protection gas, through preheating section, heating zone, soaking zone and slow cooling section, carries out anneal.Band steel carries out thermal stretch at soaking zone or cooling section, utilizes the velocity contrast of thermal stretch front and back tension force stretching roller will be with steel evenly to elongate, and makes to be with steel straightening plate shape and attenuate under 650～950 ℃ of state of temperatures.The speed V2 of thermal stretch back tension drawing roller is greater than the speed V1 of thermal stretch F strain draw roll.
The tensile strength of thermal stretch is 1～5kg/mm2.Unit elongation with steel after thermal stretch is 0～50%, preferably unit elongation≤3%.Unit elongation with steel thermal stretch is: (V2-V1)/V1.
The length in tensile deformation district equals the width between centers (when tensile deformation district band steel is in level) of 2 tension force stretching rollers, or the length in tensile deformation district equals the projecting length (when tensile deformation district band steel be not in level) of tensile deformation district in the plane of living in steel.In annealing furnace, be with steel thicker, or annealing temperature is lower, or the unit elongation stretching with steel is larger, needs more tensioning roller number, tensioning roller sum is no more than at most 20.The cornerite being wound around on each tensioning roller and on tension force stretching roller with steel should be tried one's best greatly.
Band steel can not produce work hardening and unrelieved stress more than recrystallization temperature after thermal stretch aligning attenuate.Band steel is heated to above recrystallization temperature in continuous annealing furnace, be generally 650～950 ℃, at high temperature with the yield strength of steel, generally only have 10～20% under cold conditions, plasticity with steel more than recrystallization temperature, unit elongation and relative reduction in area are all improved largely during than cold conditions, and required tensile stress is 0.5～10kg/mm
2.Through thermal stretch, with the highest unit elongation that can reach more than 30% of steel, realize efficient, low-cost, subtract Thin Strip Steel equably, be particularly advantageous in and produce that plate shape is good, the ultrathin strip of thickness≤0.25 millimeter.
For the band steel preventing or reduce through thermal stretch produces horizontal drawing down phenomenon, reserving under the roll gap gap prerequisite of threading steel necessity, the roll gap between two tension force stretching rollers should be as far as possible little, to shorten the longitudinal length in Dai Gang tensile deformation district.Dai Gang tensile deformation district longitudinal length is less, and laterally drawing down amount is also less.Tension force stretching roller surface texturing is processed and can not only be prevented from being with steel to skid when stretching, and can also prevent and reduce the horizontal drawing down phenomenon while being elongated with steel.The temperature of soaking zone or slow cooling section is generally lower than the temperature of heating zone, and drawing zone is arranged on the work-ing life that soaking zone or slow cooling section are conducive to extend tensioning roller and tension force stretching roller.Band steel is repeatedly wound around between branched heat-resisting tensioning roller and tension force stretching roller, is conducive to extend the insulation of band steel or slow cooling time, shortens the length of continuous annealing furnace.
The utility model utilizes the velocity contrast of thermal stretch front and back tension force stretching roller will be with steel evenly to elongate, and makes to be with steel at the above planished plate shape of recrystallization temperature and attenuate, and planished plate shape effect is remarkable, nothing bounce-back, has reduced energy expenditure.Band steel after thermal stretch generally need not carry out cold conditions stretching leveling after annealing again, work hardening and the unrelieved stress of having avoided cold conditions stretching leveling to bring.By dwindling the gap between tension force stretching roller and the texturing of tension force stretching roller being processed, effectively prevent or reduce in large unit elongation thermal stretch process and be with steel drawing down.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model band steel thermal stretch device in continuous annealing furnace;
Fig. 2 is the schematic diagram of another embodiment of the utility model.
Wherein:
1-1 tensioning roller, 2-2 tensioning roller, 3-3 tensioning roller, 4-1 tension force stretching roller, 5-2 tension force stretching roller, 6-4 tensioning roller, 7-5 tensioning roller, 8-6 tensioning roller, 9-be the speed before with steel tensile deformation, the V2-speed after with steel tensile deformation with steel, 10-tensile deformation district, V1-.
Embodiment
Below in conjunction with drawings and Examples, the utility model is elaborated.
The device of the utility model band steel thermal stretch in continuous annealing furnace, comprises annealing furnace, is provided with preheating section, heating zone, soaking zone and slow cooling section in annealing furnace.As shown in Figure 1, the slow cooling section of continuous strip annealing furnace is provided with drawing zone, and drawing zone is provided with 4, No. 2 tension force stretching rollers 5 of No. 1 tension force stretching roller and 6 tensioning rollers that are parallel to each other, and the roller diameter of No. 1 tension force stretching roller, No. 2 tension force stretching rollers and tension force is 500mm.Before 1, No. 2 tensioning rollers 2 of No. 1 tensioning roller and No. 3 tensioning rollers 3 are positioned at No. 1 tension force stretching roller 4,6, No. 5 tensioning rollers 7 of No. 4 tensioning rollers and No. 6 tensioning rollers 8 are positioned at after band steel leaves No. 2 tension force stretching rollers.Gap between No. 1 tension force stretching roller and No. 2 tension force stretching rollers is 10mm.Region with steel 9 between No. 1 tension force stretching roller 4 and No. 2 tension force stretching rollers 5 is tensile deformation district 10, and tensile deformation section length is 100.5mm, identical with the width between centers of 2 tension force stretching rollers of horizontal positioned.The material of No. 1 tension force stretching roller, No. 2 tension force stretching rollers and tensioning roller is heating resisting metal ZG3Cr24Ni7NRe.Texturing processing is carried out on No. 1 tension force stretching roller, No. 2 tension force stretching rollers and tensioning roller surface, to strengthen the frictional coefficient that increases tension force stretching roller and belt steel surface.
The thermal stretch process of the utility model band steel is that thickness is that 0.30mm, the trade mark are that DC04, normal temperature lower yield strength are 21kg/mm
2with steel 9, after the soaking that is 710 ℃ through excess temperature in continuous annealing furnace, enter the drawing zone of slow cooling section.Band steel 9 be take speed V1 as 2m/s promotes tension force step by step through tensioning roller 1,2,3 successively, then through No. 1 tension force stretching roller, enters tensile deformation district 10.Temperature with steel 9 in tensile deformation district is 700 ℃, and at it, more than recrystallization temperature, yield strength is 3kg/mm
2.The speed V2 of No. 2 tension force stretching rollers is 2.4m/s, larger 20% than the speed V1 of No. 1 tension force stretching roller, and band steel 9 is at unit tension >3kg/mm
2to complete unit elongation be 20% thermal stretch in condition Xia tensile deformation district 10, planished plate shape attenuate are 0.24mm.Complete after thermal stretch, band steel 9 reduces tension force step by step through tensioning roller 6,7,8 successively, completes thermal stretch whole process.
As shown in Figure 2, in continuous annealing furnace, the soaking zone of 710 ℃ of furnace temperature is provided with drawing zone to another embodiment of the utility model, and drawing zone is provided with each 2, the tensioning roller of diameter 500mm parallel to each other in same level and tension force stretching roller.The trade mark with steel 9 is DC04, and width is 1010mm.With steel 9, the yield strength of 710 ℃, be 2.8kg/mm
2.Band steel 9 passes through tensioning roller 1 and tension force stretching roller 4 successively with speed 2m/s, after strip tension progressively promotes, enters tensile deformation district 10.The length in tensile deformation district is 2200mm, identical with the width between centers of 2 tension force stretching rollers.The speed of tension force stretching roller 5 and tensioning roller 6 is 2.02m/s, forms 1% velocity contrast with tension force stretching roller 4 and tensioning roller 1.Band steel 9 is at >2.8kg/mm
2unit tensile stress Xia tensile deformation district be elongated 1%, simultaneously its width is kept to 1000mm, with the plate shape of steel 9, obtains leveling.Then with steel 9, with the speed of 2.02m/s, pass through successively tension force stretching roller 5 and tensioning roller 6, strip tension progressively successively decreases, and completes thermal stretch whole process.This embodiment, due to tensile deformation district head, is only applicable to leveling belt plate shape under the prerequisite of unit elongation≤3%, can realize by less tensioning roller quantity.After thermal stretch, belt steel thickness is substantially constant, has the horizontal drawing down rate that is equal to stretch percentage elongation.All the other situations of the present embodiment are identical with embodiment 1.
Claims (6)
1. the device with steel thermal stretch in continuous annealing furnace, comprise annealing furnace, in annealing furnace, be provided with preheating section, heating zone, soaking zone and slow cooling section, it is characterized in that: described soaking zone or slow cooling section are provided with drawing zone, described drawing zone is provided with No. 1 tension force stretching roller (4), No. 2 tension force stretching rollers (5) and 2～20 tensioning rollers, before 1～10 tensioning roller is positioned at No. 1 tension force stretching roller, after 1～10 tensioning roller is positioned at No. 2 tension force stretching rollers; Gap between No. 1 tension force stretching roller and No. 2 tension force stretching rollers is 5～5000mm.
2. the device with steel thermal stretch in continuous annealing furnace according to claim 1, it is characterized in that: the region that band steel is positioned between No. 1 tension force stretching roller (4) and No. 2 tension force stretching rollers (5) is tensile deformation district (10), and described tensile deformation section length is 5～5000mm.
3. the device with steel thermal stretch in continuous annealing furnace according to claim 2, is characterized in that: the material of described No. 1 tension force stretching roller (4), No. 2 tension force stretching rollers (5) and tensioning roller is heating resisting metal or heatproof nonmetal.
4. the device with steel thermal stretch in continuous annealing furnace according to claim 3, is characterized in that: described heating resisting metal comprises Cr25Ni20Si2 and ZG3Cr24Ni7NRe, and described heatproof nonmetal is quartz-ceramics.
5. the device with steel thermal stretch in continuous annealing furnace according to claim 1, is characterized in that: texturing processing is carried out on described No. 1 tension force stretching roller (4), No. 2 tension force stretching rollers (5) and tensioning roller surface.
6. the device with steel thermal stretch in continuous annealing furnace according to claim 1, is characterized in that: the described material with steel is carbon steel, steel alloy, stainless steel, silicon steel or iron alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320713884.6U CN203569155U (en) | 2013-11-14 | 2013-11-14 | Device for thermally stretching band steel in continuous annealing furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320713884.6U CN203569155U (en) | 2013-11-14 | 2013-11-14 | Device for thermally stretching band steel in continuous annealing furnace |
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| CN203569155U true CN203569155U (en) | 2014-04-30 |
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| CN201320713884.6U Expired - Lifetime CN203569155U (en) | 2013-11-14 | 2013-11-14 | Device for thermally stretching band steel in continuous annealing furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114410900A (en) * | 2021-12-13 | 2022-04-29 | 新疆湘润新材料科技有限公司 | Continuous stress relief annealing process for cold-rolled titanium strip |
-
2013
- 2013-11-14 CN CN201320713884.6U patent/CN203569155U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114410900A (en) * | 2021-12-13 | 2022-04-29 | 新疆湘润新材料科技有限公司 | Continuous stress relief annealing process for cold-rolled titanium strip |
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Granted publication date: 20140430 |
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