CN108559834A - A kind of fixed hot rolling heat preservation annealing device - Google Patents
A kind of fixed hot rolling heat preservation annealing device Download PDFInfo
- Publication number
- CN108559834A CN108559834A CN201810632228.0A CN201810632228A CN108559834A CN 108559834 A CN108559834 A CN 108559834A CN 201810632228 A CN201810632228 A CN 201810632228A CN 108559834 A CN108559834 A CN 108559834A
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- coil
- strip
- hot rolling
- annealing device
- insulation cover
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- 238000005098 hot rolling Methods 0.000 title claims abstract description 26
- 238000000137 annealing Methods 0.000 title claims abstract description 25
- 238000004321 preservation Methods 0.000 title claims abstract description 12
- 238000009413 insulation Methods 0.000 claims abstract description 60
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000010276 construction Methods 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 4
- 239000012774 insulation material Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000010583 slow cooling Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 4
- 238000002791 soaking Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 238000005097 cold rolling Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/663—Bell-type furnaces
- C21D9/665—Bell-type furnaces inverted or side-facing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0025—Supports; Baskets; Containers; Covers
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/663—Bell-type furnaces
- C21D9/667—Multi-station furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/663—Bell-type furnaces
- C21D9/677—Arrangements of heating devices
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
A kind of fixed hot rolling heat preservation annealing device, including, steel coil tray；At least one coil of strip prop, is set on the steel coil tray；Insulation cover covers at outside the coil of strip prop, and cavity volume is more than the volume of+one coil of strip prop of at least one coil of strip, and insulation cover lower end is movably connected on the steel coil tray.The fixed hot rolling of the present invention keeps the temperature annealing device after batching immediately to the isothermal holding of coil of strip, reduce the intermediate transfer time, the heat treatment process for being implemented soaking, slow cooling to coil of strip using the heat of coil of strip itself is achieved the purpose that efficient, energy saving and provides lumber recovery.
Description
Technical field
The present invention relates to a kind of fixed hot rollings to keep the temperature annealing device.
Background technology
The production of cold rolling super-high strength steel is primarily present strip length and the big problem of width direction performance inconsistency, and cold rolling is caused to be given birth to
Occur roll-force big ups and downs, cold rolling finished product thickness super tolerance standard when production, the rolling that this had both influenced cold rolling acid Continuous mill train is steady
It is qualitative, and seriously affect cold rolling super-high strength steel lumber recovery.
Existing attemperator is as follows：
(1) most outstanding problem existing for rolling line attemperator is to enter the interval time mistake of attemperator after strip coiling
Long, the metallographic structure transformation of strip to be had occurred and that or completes, and offline slow cooling mode cannot expire the effect of hot rolling performance improvement
The quality requirements of sufficient high-strength steel.Hot rolling producing line first passes through transport using the form that holding pit is arranged behind coiling machine
The equipment such as chain, then the coil of strip after rolling is hung in the holding pit with certain insulating power by driving a vehicle.Hot rolling is placed into
20~30 minutes of handling are needed in insulation cover, the air cooling time of coil of strip is too long, influences heat insulation effect and material property.
(2) such attemperator increases the cost that the producing lines such as special holding pit, holding furnace, bell furnace, heat treatment are arranged
The normal production of universal higher and transformation process influence long in time limit.And it asks there are heat insulation effect (temperature drop rate is very fast) is bad
Topic.
Invention content
It is an object of the invention to design a kind of fixed hot rolling heat preservation annealing device, immediately to coil of strip after batching
Isothermal holding, reduce it is intermediate transfer the time, implement the heat treatment work of soaking, slow cooling to coil of strip using the heat of coil of strip itself
Skill achievees the purpose that efficient, energy saving and provides lumber recovery.
In order to achieve the above objectives, the technical scheme is that：
A kind of fixed hot rolling heat preservation annealing device comprising, steel coil tray；At least one coil of strip prop, if
It is placed on the steel coil tray；Insulation cover covers at outside the coil of strip prop, and cavity volume is more than at least one coil of strip
The volume of+one coil of strip prop, insulation cover lower end are movably connected on the steel coil tray.
Further, further include electric heater unit, be set to the insulation cover madial wall；Temperature sensor is set to described
In insulation cover；Information collection control module, the electric heater unit, temperature sensor are electrically connected information collection control mould
Block.Insulation cover can not only be realized to coils of hot-rolled steel residual temperature using slow cooling is realized, can be carried out simultaneously for certain special rolling-mill sections
Reheating processing realizes that double tempering improves coil of strip performance crystal grain thinning.
Further, the insulation cover also sets the gas shield device and gas sensor that can be passed through protective gas, and divides
It is not electrically connected an information collection control module.Protective gas is passed through to insulation cover inside, to air in coil of strip into line replacement, is prevented
Only Oxidation of steel coil increases coil of strip surface quality.
Also, being equipped with signal emission module in described information acquisition control module, air, the temperature data in insulation cover are passed
It send to ground-based server.
Preferably, the insulation cover is composite construction, and external protection is high strength steel plate, and middle layer is thermal insulation material, internal layer
For high temperature resistant stainless steel plate.
Preferably, the insulation cover be composite construction, from inside to outside successively include internal radiation layer, electric heating wire layer,
Intermediate guard, intermediate insulating layer, external protection.
Preferably, the insulation cover composite construction is fixed using anchor studs.
Preferably, the insulation cover is square thermal-insulation cover or round insulation cover.
Preferably, the insulation cover side lower sets positioning sleeve, corresponding, sets on the steel coil tray and matches with the positioning sleeve
The positioning pin of conjunction；The positioning pin is preferably bullet.When coil of strip is discharged to from coiling machine cavity on pallet, insulation cover is placed
Can be automatically positioned above to conical dowel pin, enable insulation cover Fast Installation position to be formed confined space ensure temperature will not
It is lost in.
Preferably, air hole and corresponding drain tap are set on the insulation cover.Increase opens up ventilative inside insulation cover
Drain tap is installed in hole.Coil of strip is mounted on conveyer chain pallet back cover and keeps the temperature closure assembly, inner space temperature after the completion of hot rolling reeling
Warm up to 600 DEG C or more.Coil of strip adheres to a small amount of steam by surface during section cooling, strip coiling simultaneously.To ensure to set
Standby safety and raising coil of strip quality remove high-temperature gas being passed through protective gas front row to insulation cover.
Preferably, the electric heater unit is electric heating wire, and the temperature sensor is thermocouple, for detecting insulation cover
The temperature change of inner air.
Preferably, the steel coil tray is composite construction, and bottom-up includes substrate, insulating layer, internal radiation layer successively.
After strip coiling, after coil of strip is transported fixed insulation cover pallet, attemperator is added on pallet immediately, when first
Between coil of strip is kept the temperature, realize the isothermal holding to batching rear strip coil of strip.
Annealing device processing capacity is kept the temperature to increase hot rolling, single, double and multi-joint row's steel coil tray can be made.
Beneficial effects of the present invention：
Insulation cover of the present invention is individually independent, saves the time while improving rhythm of production and efficiency.
The present invention realizes the isothermal holding to batching rear strip coil of strip at the first time, this arrives very big improve after coil of strip batches
The performance improvement brought into annealing device overlong time is insufficient and strip length and the big difficulty of width direction performance inconsistency
Topic.There is roll-force big ups and downs, the super tolerance standard of cold rolling finished product thickness when avoiding result in cold rolling production, increases cold rolling acid tandem rolling
The rolling stability of unit increases cold rolling super-high strength steel lumber recovery.
Structure of the invention design is with lightweight construction, heat insulation effect is good, coil of strip handling facility, high degree of automation, close
The features such as closing property is good advanced optimizes the heat preservation, soaking and antioxidant effect of the equipment.
Using newest Whole fiber annealing furnace technical standard, in conjunction with the theory of high-strength steel lightweight structure, design and manufacture and reach
Required to certain air-tightness and have certain temperature control function, energy-saving and environment-friendly have the energy for keeping the temperature equal thermal effect full-automatic
The beam-type steel roll transport apparatus of operation, to achieve the effect that the best high-strength Steel Properties of improvement.
Description of the drawings
Fig. 1 is the front view of the embodiment of the present invention.
Fig. 2 is the side view of the embodiment of the present invention.
Fig. 3 is the structural schematic diagram of coil of strip prop and steel coil tray in the embodiment of the present invention.
Fig. 4 is the structural schematic diagram of insulation cover positioning sleeve and detent fit described in the embodiment of the present invention.
Fig. 5 is the sectional view of insulation cover in the embodiment of the present invention.
Specific implementation mode
Referring to Fig. 1~Fig. 5, a kind of fixed hot rolling of the invention keeps the temperature annealing device comprising,
Steel coil tray 1；
At least one coil of strip prop 2, is set on the steel coil tray 1；
Insulation cover 3 covers at outside the coil of strip prop 2, and cavity volume is more than at least one coil of strip 100+ mono-
The volume of coil of strip prop 2,3 lower end of insulation cover are movably connected on the steel coil tray 1.
Further, further include,
Electric heater unit 4 is set to 3 madial wall of the insulation cover；
Temperature sensor 5 is set in the insulation cover 3；
Information collection control module 6, the electric heater unit 4, temperature sensor 5 are electrically connected the information collection and control mould
Block 6.
Further, the insulation cover 3 also sets the gas shield device 7 and gas sensor that can be passed through protective gas, and
An information collection control module 6 is electrically connected.Coil of strip after the completion of hot rolling reeling is mounted on conveyer chain pallet back cover
Insulation cover, to prevent Oxidation of steel coil from increasing surface quality.Protective gas is passed through for insulation cover inside, air in coil of strip is carried out
Displacement.Prevent Oxidation of steel coil from increasing coil of strip surface quality.
Also, signal emission module is equipped in described information acquisition control module 6, by air, the temperature data in insulation cover 3
It is sent to ground-based server, while related coil of strip data information transfer to downstream is borrowed into nothing by a Wireless remote control case
Line and electrical storage device realize the sampling of insulation cover movable type thermometric, data wireless transmission, the functions such as logistics information write-in reading.
Preferably, the insulation cover 3 is composite construction, and external protection is high strength steel plate, and middle layer is thermal insulation material, internal layer
For high temperature resistant stainless steel plate.
Referring to Fig. 5, insulation cover 3 of the present invention is composite construction, includes internal radiation layer 31, electricity successively from inside to outside
Heater strip layer 32, intermediate guard 33, intermediate insulating layer 34, external protection 35；3 composite construction of the insulation cover uses anchor studs 35
It is fixed.
Preferably, the insulation cover 3 is square thermal-insulation cover or round insulation cover.
Preferably, 3 side lower of the insulation cover sets positioning sleeve 8, corresponding, is set on the steel coil tray 1 and the positioning
The positioning pin 9 of 8 cooperation of set；The positioning pin 9 is preferably bullet.
When coil of strip is discharged to from coiling machine on pallet, insulation cover positioning sleeve is placed into above conical dowel pin can be automatic
Positioning, enable insulation cover Fast Installation position to be formed confined space ensure temperature will not be lost in.
Preferably, air hole and corresponding drain tap 10 are set on the insulation cover 3.Coil of strip is installed after the completion of hot rolling reeling
Closure assembly, warm up to 600 DEG C or more of inner space are kept the temperature on conveyer chain pallet back cover；Simultaneously coil of strip by section cooling,
A small amount of steam is adhered on surface during strip coiling.To ensure equipment safety and improving coil of strip quality, guarantor is being passed through to insulation cover
It protects gas front row and removes high-temperature gas.
Preferably, the electric heater unit 4 is electric heating wire, and the temperature sensor 5 is thermocouple；Insulation cover not only can
It realizes to coils of hot-rolled steel residual temperature using slow cooling is realized, reheating processing can be carried out simultaneously for certain special rolling-mill sections, it is real
Existing double tempering improves coil of strip performance crystal grain thinning.
Preferably, the steel coil tray 1 is composite construction, and bottom-up includes substrate 11, insulating layer 12, internal spoke successively
Penetrate layer 13.
The fixed hot rolling heat preservation annealing device of the present invention batches place in coil of strip, immediately moves coils of hot-rolled steel after batching
It is sent into the heat preservation annealing device, realizes the isothermal holding to batching rear strip coil of strip.
The present invention realizes that carrying out UTILIZATION OF VESIDUAL HEAT IN to the coil of strip for just completing to batch achievees the purpose that annealing, can greatly improve
Coil of strip batch after to entering insufficient heat preservation, the performance improvement that brings of annealing device overlong time and strip length and width
Directional performance fluctuates big problem.The hot-strip of extraordinary batch is carried out to go deep into the specially treateds such as processing, is integrated in
Heating device and protective gas cooling input inside insulation cover can coordinate realization to control temperature under necessary state.
Claims (10)
1. a kind of fixed hot rolling keeps the temperature annealing device, which is characterized in that including,
Steel coil tray；
At least one coil of strip prop, is set on the steel coil tray；
Insulation cover covers at outside the coil of strip prop, and cavity volume is more than+one coil of strip support branch of at least one coil of strip
The volume of frame, insulation cover lower end are movably connected on the steel coil tray.
2. fixed hot rolling as described in claim 1 keeps the temperature annealing device, which is characterized in that further include,
Electric heater unit is set to the insulation cover madial wall；
Temperature sensor is set in the insulation cover；
Information collection control module, the electric heater unit, temperature sensor are electrically connected the information collection control module.
3. fixed hot rolling as claimed in claim 1 or 2 keeps the temperature annealing device, which is characterized in that the insulation cover is also set
It can be passed through the gas shield device and gas sensor of protective gas, and an information collection control module is electrically connected.
4. the fixed hot rolling as described in claims 1 or 2 or 3 keeps the temperature annealing device, which is characterized in that described information acquires
It is equipped with signal emission module in control module, air, the temperature data in insulation cover are sent to ground-based server.
5. the fixed hot rolling as described in claims 1 or 2 or 3 keeps the temperature annealing device, which is characterized in that the insulation cover side
Face lower part sets positioning sleeve, corresponding, and the positioning pin coordinated with the positioning sleeve is set on the steel coil tray；The positioning pin is preferably
Bullet.
6. the fixed hot rolling as described in claims 1 or 2 or 3 or 5 keeps the temperature annealing device, which is characterized in that the heat preservation
Air hole and corresponding drain tap are set on cover.
7. fixed hot rolling as described in claim 1 keeps the temperature annealing device, which is characterized in that the electric heater unit is electricity
Heater strip, the temperature sensor are thermocouple.
8. the fixed hot rolling as described in claims 1 or 2 or 3 or 5 keeps the temperature annealing device, which is characterized in that the heat preservation
Cover is composite construction, and external protection is high strength steel plate, and middle layer is thermal insulation material, and internal layer is high temperature resistant stainless steel plate.
9. the fixed hot rolling as described in claims 1 or 2 or 3 or 5 keeps the temperature annealing device, which is characterized in that the heat preservation
Cover is composite construction, includes internal radiation layer, electric heating wire layer, intermediate guard, intermediate insulating layer, outer guarantor successively from inside to outside
Sheath.
10. fixed hot rolling as described in claim 1 keeps the temperature annealing device, which is characterized in that the steel coil tray is multiple
Structure is closed, bottom-up includes substrate, insulating layer, internal radiation layer successively.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810632228.0A CN108559834A (en) | 2018-06-19 | 2018-06-19 | A kind of fixed hot rolling heat preservation annealing device |
| KR1020207010726A KR102397796B1 (en) | 2017-09-20 | 2018-09-20 | Stationary Hot Coil Thermal Insulation Heat Treatment Equipment |
| PCT/CN2018/106718 WO2019057118A1 (en) | 2017-09-20 | 2018-09-20 | Fixed type hot coil thermal insulation heat treatment device |
| JP2020537828A JP6952197B2 (en) | 2017-09-20 | 2018-09-20 | Fixed hot coil heat insulation heat treatment equipment |
| EP18857961.9A EP3686298A4 (en) | 2017-09-20 | 2018-09-20 | Fixed type hot coil thermal insulation heat treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810632228.0A CN108559834A (en) | 2018-06-19 | 2018-06-19 | A kind of fixed hot rolling heat preservation annealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108559834A true CN108559834A (en) | 2018-09-21 |
Family
ID=63553892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810632228.0A Pending CN108559834A (en) | 2017-09-20 | 2018-06-19 | A kind of fixed hot rolling heat preservation annealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108559834A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109628719A (en) * | 2018-12-07 | 2019-04-16 | 陈宏涛 | A kind of handware Equipment for Heating Processing that the thermal efficiency is high |
| CN111391195A (en) * | 2020-03-27 | 2020-07-10 | 大连北方互感器集团有限公司 | Later curing process for epoxy resin vacuum pouring |
| CN112063815A (en) * | 2020-08-25 | 2020-12-11 | 宝钢湛江钢铁有限公司 | Method for improving performance uniformity of finished product by heat preservation and slow cooling after rolling |
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|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109628719A (en) * | 2018-12-07 | 2019-04-16 | 陈宏涛 | A kind of handware Equipment for Heating Processing that the thermal efficiency is high |
| CN111391195A (en) * | 2020-03-27 | 2020-07-10 | 大连北方互感器集团有限公司 | Later curing process for epoxy resin vacuum pouring |
| CN111391195B (en) * | 2020-03-27 | 2021-08-31 | 大连北方互感器集团有限公司 | Later curing process for epoxy resin vacuum pouring |
| CN112063815A (en) * | 2020-08-25 | 2020-12-11 | 宝钢湛江钢铁有限公司 | Method for improving performance uniformity of finished product by heat preservation and slow cooling after rolling |
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