CN104313295A - Continuous tempering furnace of roller hearth plates and annealing method thereof - Google Patents
Continuous tempering furnace of roller hearth plates and annealing method thereof Download PDFInfo
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- CN104313295A CN104313295A CN201410584014.2A CN201410584014A CN104313295A CN 104313295 A CN104313295 A CN 104313295A CN 201410584014 A CN201410584014 A CN 201410584014A CN 104313295 A CN104313295 A CN 104313295A
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- 238000005496 tempering Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims description 23
- 238000000137 annealing Methods 0.000 title 1
- 238000010438 heat treatment Methods 0.000 claims abstract description 73
- 238000007599 discharging Methods 0.000 claims abstract description 14
- 239000007921 spray Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 74
- 238000010304 firing Methods 0.000 claims description 51
- 238000002485 combustion reaction Methods 0.000 claims description 26
- 238000007664 blowing Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 abstract description 5
- 238000005507 spraying Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003079 width control Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a continuous tempering furnace of roller hearth plates. The continuous tempering furnace comprises a furnace body, a feeding device and a discharging device which are installed at the two ends of the furnace body, wherein the furnace body comprises a flame heating segment and strong convection heat preservation segment connected with the flame heating segment, the hearth of the strong convection heat preservation segment is communicated with the hearth of the flame heating segment, the furnace body is provided with a conveying roller way used for conveying plates, the conveying roller way penetrates through the hearths of the strong convection heat preservation segment and the flame heating segment, a flame heating device with adjustable firepower is arranged in the flame heating segment, and a strong convection spray heating device used for circulating heating and spraying hot air is arranged on the strong convection heat preservation segment; the feeding device comprises a feeding roller way connected with the feeding end of the conveying roller way; and the discharging device comprises a discharging roller way connected with the discharging end of the conveying roller way. The continuous tempering furnace of roller hearth plates achieves the function of one multipurpose furnace, and the furnace temperature control precision is high.
Description
Technical field
The present invention relates to the Field of Heat-treatment of sheet material, particularly a kind of roller bottom type sheet material continuous tempering furnace and tempering method thereof.
Background technology
At present, in large-scale steel plate hot treatment plant, for realizing continuous high yield, the thermal treatment of steel plate all adopts continuous roller-hearth heat treatment furnace.No matter usual quenching furnance and normalizing furnace furnace temperature, between 900 ~ 1000 DEG C, adopt radiator tube indirect heating or use open flame combustion nozzle direct heating, and the index requests such as Control for Kiln Temperature precision, temperature uniformity, steel plate heating uniformity easily realize.But, for tempering stove, particularly middle low-temp temper furnace, furnace temperature is between 200 ~ 400 DEG C, and because temperature is relatively low, its heat transfer type is changed into by the heat transfer type based on radiation based on thermal convection, adopt traditional naked light or radiator tube heating, there is the problem of the slow and poor temperature uniformity of rate of heating, thus cannot ensure quality product, be unfavorable for developing high-precision end product.
For this reason, in order to realize low temperature heat-treatment process in steel plate, usually car-type heat treating furnace is adopted, its principle is that the hot gas by passing into temperature-controllable carries out low-temperature heat, but car formula heat treatment furnace can only steply be produced, and it yields poorly and steel plate is yielding.In addition, the tempering mode of tempering stove has high tempering, average tempering, low-temperaturetempering three kinds of modes, the middle high tempering stove of construction one and a low-temp temper furnace is generally needed to realize high tempering, average tempering and low-temperaturetempering respectively, there is occupation area of equipment so large, the problem of the high and batch production waste production capacity of cost of investment.
Summary of the invention
Main purpose of the present invention is to provide a kind of roller bottom type sheet material continuous tempering furnace and tempering method thereof, is intended to by an equipment compatible senior middle school low-temperaturetempering three kinds of tempering modes simultaneously, and improves its Control for Kiln Temperature precision.
The present invention proposes a kind of roller bottom type sheet material continuous tempering furnace, comprises body of heater and is installed on feeding device and the blanking device at described body of heater two ends, wherein,
The strong convection holding-zone that described body of heater comprises open firing section and is connected with described open firing section, the burner hearth of described strong convection holding-zone is connected with the burner hearth of described open firing section, described body of heater is provided with the rollgang for transmitting sheet material, this rollgang is through the burner hearth of described strong convection holding-zone and open firing section, be provided with the adjustable open firing device of firepower in described open firing section, described strong convection holding-zone is provided with the strong convection winding-up heating unit for circulating-heating blowing hot air; Described feeding device comprises the charging roller be connected with the feeding end of described rollgang; Described dumping device comprises the discharging roller table be connected with the discharge end of described rollgang, and the feeding end of described rollgang is positioned at the burner hearth of described open firing section, and the discharge end of described rollgang is positioned at the burner hearth of described strong convection holding-zone.
Preferably, described open firing device comprises multiple large and small fire pulse open flame combustion nozzle.
Preferably, multiple described large and small fire pulse open flame combustion nozzles are distributed in the two side of the burner hearth of described open firing section, and multiple described large and small fire pulse open flame combustion nozzle is distributed in the upper and lower both sides of described rollgang.
Preferably, multiple described large and small fire pulse open flame combustion nozzle is uniformly distributed in the burner hearth of described open firing section.
Preferably, described roller bottom type sheet material continuous tempering furnace also comprises the controller for controlling its naked light size be electrically connected with described large and small fire pulse open flame combustion nozzle.
Preferably, described strong convection winding-up heating unit comprise recirculation blower, for heat furnace gas heating unit, for collecting and distributing the distributor box of the furnace gas after described heating devices heat, and the furnace gas for being distributed by described distributor box blows to the spray box of sheet material on described rollgang, wherein, described recirculation blower is positioned at the burner hearth upper and lower sides of described strong convection holding-zone, described distributor box is positioned at the impeller side of described recirculation blower, described heating unit is contained in described distributor box, and both sides relative in distributor box described in are equipped with described heating unit.
Preferably, described strong convection winding-up heating unit is provided with multiple, and multiple described strong convection winding-up heating unit is uniformly distributed in upper and lower both sides in the burner hearth of described strong convection holding-zone.
Preferably, also firebreak is provided with between described strong convection holding-zone and open firing section.
The present invention proposes a kind of tempering method based on above-mentioned roller bottom type sheet material continuous tempering furnace further, comprising:
According to the naked light size of tempering process temperature adjustment open firing device and the heating power of strong convection winding-up heating unit of pending sheet material;
Sheet material transfers in the burner hearth of open firing section by its charging roller by feeding device, after described sheet material heats in the burner hearth of described open firing section, described sheet material transfers in the burner hearth of strong convection holding-zone and is incubated described sheet material by rollgang, and conveying sheet is gone out outside the burner hearth of described strong convection holding-zone by its discharging roller table by blanking device.
The roller bottom type sheet material continuous tempering furnace that the present invention proposes, by arranging the combination of strong convection holding-zone and open firing section, thus making a machine realize high, medium and low temperature three kinds of tempering process, realizing the function of multi-use.The temperature uniformity of this roller bottom type sheet material continuous tempering furnace is good, and Control for Kiln Temperature precision is high, and blocked operation is simple.In addition, strong convection holding-zone to be jetted sheet material with circulating-heating by strong convection winding-up heating unit, and in the low-temperature heat process taking thermal convection as main heat exchange form, its rate of heating is fast, and furnace temperature is even, and therefore, sheet material heating is relatively uniform, and board materials production quality is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of roller bottom type sheet material continuous tempering furnace preferred embodiment of the present invention;
Fig. 2 is the structural representation of open firing section in roller bottom type sheet material continuous tempering furnace preferred embodiment of the present invention;
Fig. 3 is the sectional structure schematic diagram of strong convection holding-zone in roller bottom type sheet material continuous tempering furnace preferred embodiment of the present invention;
[figure number is to as directed]
1-charging roller; 2-body of heater; 20-rollgang; 21-charging fire door; 22-open firing section; 22.1-large and small fire pulse open flame combustion nozzle; 23-firebreak; 24-strong convection holding-zone; 24.1-recirculation blower; 24.2-distributor box; 24.3-spray box; 24.4-heating unit; 25-discharging door; 3-discharging roller table; 4-sheet material.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The present invention proposes a kind of roller bottom type sheet material continuous tempering furnace.
Referring to figs. 1 through the structural representation that Fig. 3, Fig. 1 are roller bottom type sheet material continuous tempering furnace preferred embodiment of the present invention; Fig. 2 is the structural representation of open firing section in roller bottom type sheet material continuous tempering furnace preferred embodiment of the present invention; Fig. 3 is the sectional structure schematic diagram of strong convection holding-zone in roller bottom type sheet material continuous tempering furnace preferred embodiment of the present invention.
In this preferred embodiment, roller bottom type sheet material continuous tempering furnace, comprises body of heater 2 and is installed on feeding device and the blanking device at body of heater 2 two ends, wherein,
The strong convection holding-zone 24 that body of heater 2 comprises open firing section 22 and is connected with open firing section 22, the burner hearth of strong convection holding-zone 24 is connected with the burner hearth of open firing section 22, body of heater 2 is provided with the rollgang 20 for transmitting sheet material 4, this rollgang 20 is through the burner hearth of strong convection holding-zone 24 and open firing section 22, be provided with the adjustable open firing device of firepower in open firing section 22, strong convection holding-zone 24 is provided with the strong convection winding-up heating unit for circulating-heating blowing hot air; Feeding device comprises the charging roller 1 be connected with the feeding end of rollgang 20; Dumping device comprises the discharging roller table 3 be connected with the discharge end of rollgang 20, and the feeding end of rollgang 20 is positioned at the burner hearth of open firing section 22, and the discharge end of rollgang 20 is positioned at the burner hearth of strong convection holding-zone 24.
Particularly, composition graphs 1 and Fig. 3, open firing device comprises multiple large and small fire pulse open flame combustion nozzle 22.1.Multiple large and small fire pulse open flame combustion nozzles 22.1 are distributed in the two side of the burner hearth of open firing section 22, and multiple large and small fire pulse open flame combustion nozzle 22.1 is distributed in the upper and lower both sides of rollgang 20.Multiple large and small fire pulse open flame combustion nozzle 22.1 is uniformly distributed in the burner hearth of open firing section 22.Further, roller bottom type sheet material continuous tempering furnace also comprises the controller (not shown) for controlling its naked light size be electrically connected with large and small fire pulse open flame combustion nozzle 22.1.Its naked light size of large and small fire pulse open flame combustion nozzle 22.1 operates, and switches simple between different naked light simultaneously, by Pulse Width Control, can ensure temperature uniformity and the accuracy requirement of heating furnace temperature.
The multifunctional assembled roller bottom type sheet material continuous tempering furnace that the present invention proposes, its open firing section 22 is provided with large and small fire pulse open flame combustion nozzle 22.1, and large and small fire pulse open flame combustion nozzle 22.1 in body of heater 2 both sides, and is arranged in the upper and lower both sides of sheet material 4 travel line, therefore, the homogeneity of furnace temperature can be improved.In the present embodiment, large and small fire pulse open flame combustion nozzle 22.1 adopts two gas inlet pipelines, controller realizes size two kinds of rated output pulse-combustions on a burner, then adopt when needs low temperature little fiery pulse-combustion to carry out small power heat supply and ensure thermal load and furnace temperature requirement, burning is coordinated to ensure technological temperature when just adopting big fire pulse raising heating power or large and small fire pulse in needs during high temperature, therefore, this roller bottom type sheet material continuous tempering furnace is very large to furnace temperature regulation range.
Particularly, in the present embodiment, strong convection winding-up heating unit comprises recirculation blower 24.1, for heating the heating unit 24.4 of furnace gas, for collecting and distributing the distributor box 24.2 of furnace gas after heating unit 24.4 heats, and the furnace gas for being distributed by distributor box 24.2 blows to the spray box 24.3 of sheet material 4 on rollgang 20, wherein, recirculation blower 24.1 is positioned at the burner hearth upper and lower sides of strong convection holding-zone 24, distributor box 24.2 is positioned at the impeller side of recirculation blower 24.1, heating unit 24.4 is contained in distributor box 24.2, in one distributor box 24.2, relative both sides are equipped with heating unit 24.4.
Firebreak 23 is also provided with between strong convection holding-zone 24 and open firing section 22.
Strong convection winding-up heating unit working process is: be incorporated in distributor box 24.2 by the guide functions of recirculation blower 24.1 by the furnace gas after heat sheet material 4 in stove, in distributor box 24.2 through being positioned at after distributor box 24.2 inner heating device 24.4 heats, spray box 24.3 is assigned to sheet material 4 of jetting by distributor box 24.2, thus carry out heat exchange with sheet material 4, complete whole circulating-heating winding-up process.
Further, strong convection winding-up heating unit is provided with multiple, and multiple described strong convection winding-up heating unit is uniformly distributed in upper and lower both sides in the burner hearth of described strong convection holding-zone, thus makes furnace temperature even further, can improve the quality of the sheet material 4 produced.
When carrying out low-temperaturetempering technique, temperature control precision under open firing section 22 adjusting size fire pulse open flame combustion nozzle 22.1 carries out little fiery pulse-combustion guarantee low-temperature heat technique, then, sheet material 4 transfers in the burner hearth of open firing section 22 by its charging roller 1 by feeding device, complete the homogeneous heating of low temperature, then, sheet material 4 transfers in the burner hearth of strong convection holding-zone 24 by rollgang 20, at strong convection holding-zone 24 by controlling the operating power of its heating unit 24.4 thus ensureing that hot blast temperature is arranged in 200 ~ 400 DEG C of a certain technological temperatures, thus circulating-heating sheet material 4 carries out even heat preservation method, finally, sheet material 4 is transported out outside the burner hearth of strong convection holding-zone 24 by its discharging roller table 3 by blanking device.
When middle high-temperature tempering process is carried out to pending sheet material 4, big fire burning is carried out at open firing section 22 adjusting size fire pulse open flame combustion nozzle 22.1, thermal load requirement in guarantee under elevated heating processes, the even furnace temperature of a certain furnace temperature in being ensured by Pulse Width Control under elevated heating processes, complete the rapid and uniform heating of middle high temperature, by the guide functions of recirculation blower 24.1 furnace gas after heat sheet material 4 in stove to be guided into after heating unit 24.4 heats at strong convection holding-zone, introduce distributor box 24.2, each spray box 24.3 is assigned to sheet material 4 of jetting by distributor box 24.2, simultaneously, during the thermosteresis of supplementing insulating process by heating unit 24.4 realizes, high-temperature technology is in the insulation of a certain temperature, finally, sheet material 4 is transported out outside the burner hearth of strong convection holding-zone 24 by its discharging roller table 3 by blanking device.
The roller bottom type sheet material continuous tempering furnace that the present embodiment proposes, by arranging the combination of strong convection holding-zone 24 and open firing section 22, thus making a machine realize high, medium and low temperature three kinds of tempering process, realizing the function of multi-use.The temperature uniformity of this roller bottom type sheet material continuous tempering furnace is good, and Control for Kiln Temperature precision is high, and blocked operation is simple.In addition, strong convection holding-zone 24 is by strong convection winding-up heating unit with circulating-heating winding-up sheet material 4, and in the low-temperature heat process taking thermal convection as main heat exchange form, its rate of heating is fast, furnace temperature is even, therefore, sheet material 4 heats relatively uniform, and sheet material 4 quality produced is good.
The present invention also proposes a kind of tempering method based on above-mentioned roller bottom type sheet material continuous tempering furnace further.
In this preferred embodiment, a kind of tempering method based on above-mentioned roller bottom type sheet material continuous tempering furnace, comprising:
According to the naked light size of tempering process temperature adjustment open firing device and the heating power of strong convection winding-up heating unit of pending sheet material;
Sheet material transfers in the burner hearth of open firing section by its charging roller by feeding device, after described sheet material heats in the burner hearth of described open firing section, described sheet material transfers in the burner hearth of strong convection holding-zone and is incubated described sheet material by rollgang, and conveying sheet is gone out outside the burner hearth of described strong convection holding-zone by its discharging roller table by blanking device.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure transformation utilizing specification sheets of the present invention and accompanying drawing content to do, or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (9)
1. a roller bottom type sheet material continuous tempering furnace, is characterized in that, comprises body of heater and is installed on feeding device and the blanking device at described body of heater two ends, wherein,
The strong convection holding-zone that described body of heater comprises open firing section and is connected with described open firing section, the burner hearth of described strong convection holding-zone is connected with the burner hearth of described open firing section, described body of heater is provided with the rollgang for transmitting sheet material, this rollgang is through the burner hearth of described strong convection holding-zone and open firing section, be provided with the adjustable open firing device of firepower in described open firing section, described strong convection holding-zone is provided with the strong convection winding-up heating unit for circulating-heating blowing hot air; Described feeding device comprises the charging roller be connected with the feeding end of described rollgang; Described dumping device comprises the discharging roller table be connected with the discharge end of described rollgang, and the feeding end of described rollgang is positioned at the burner hearth of described open firing section, and the discharge end of described rollgang is positioned at the burner hearth of described strong convection holding-zone.
2. roller bottom type sheet material continuous tempering furnace as claimed in claim 1, it is characterized in that, described open firing device comprises multiple large and small fire pulse open flame combustion nozzle.
3. roller bottom type sheet material continuous tempering furnace as claimed in claim 2, it is characterized in that, multiple described large and small fire pulse open flame combustion nozzles are distributed in the two side of the burner hearth of described open firing section, and multiple described large and small fire pulse open flame combustion nozzle is distributed in the upper and lower both sides of described rollgang.
4. roller bottom type sheet material continuous tempering furnace as claimed in claim 2, it is characterized in that, multiple described large and small fire pulse open flame combustion nozzle is uniformly distributed in the burner hearth of described open firing section.
5. roller bottom type sheet material continuous tempering furnace as claimed in claim 2, is characterized in that, also comprising the controller for controlling its naked light size be electrically connected with described large and small fire pulse open flame combustion nozzle.
6. as the roller bottom type sheet material continuous tempering furnace in claim 1 to 5 as described in any one, it is characterized in that, described strong convection winding-up heating unit comprises recirculation blower, for heating the heating unit of furnace gas, for collecting and distributing the distributor box of the furnace gas after described heating devices heat, and the furnace gas for being distributed by described distributor box blows to the spray box of sheet material on described rollgang, wherein, described recirculation blower is positioned at the burner hearth upper and lower sides of described strong convection holding-zone, described distributor box is positioned at the impeller side of described recirculation blower, described heating unit is contained in described distributor box, both sides relative in distributor box described in are equipped with described heating unit.
7. roller bottom type sheet material continuous tempering furnace as claimed in claim 6, is characterized in that, described strong convection winding-up heating unit is provided with multiple, and multiple described strong convection winding-up heating unit is uniformly distributed in upper and lower both sides in the burner hearth of described strong convection holding-zone.
8. roller bottom type sheet material continuous tempering furnace as claimed in claim 1, is characterized in that, be also provided with firebreak between described strong convection holding-zone and open firing section.
9., based on a tempering method for any one roller bottom type sheet material continuous tempering furnace in such as claim 1 to 8, it is characterized in that, comprising:
According to the naked light size of tempering process temperature adjustment open firing device and the heating power of strong convection winding-up heating unit of pending sheet material;
Sheet material transfers in the burner hearth of open firing section by its charging roller by feeding device, after described sheet material heats in the burner hearth of described open firing section, described sheet material transfers in the burner hearth of strong convection holding-zone and is incubated described sheet material by rollgang, and conveying sheet is gone out outside the burner hearth of described strong convection holding-zone by its discharging roller table by blanking device.
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| CN201410584014.2A CN104313295B (en) | 2014-10-27 | 2014-10-27 | Roller-bottom type sheet material continuous tempering furnace and tempering method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104846185A (en) * | 2015-04-21 | 2015-08-19 | 武汉钢铁(集团)公司 | Alloying furnace holding-section atmoseal furnace temperature compensation device |
| CN108546815A (en) * | 2018-04-20 | 2018-09-18 | 特诺恩技术（天津）有限公司 | Wide and Thick Slab roller bottom furnace system with strong convection circulator |
| CN108787906A (en) * | 2018-08-16 | 2018-11-13 | 艾伯纳工业炉(太仓)有限公司 | A kind of roller-bottom type aluminum alloy heat forming furnace |
| CN109013924A (en) * | 2018-08-16 | 2018-12-18 | 艾伯纳工业炉(太仓)有限公司 | Roller-bottom type aluminum alloy heat forming furnace |
| CN110257596A (en) * | 2019-07-17 | 2019-09-20 | 艾伯纳工业炉(太仓)有限公司 | A kind of tempering furnace |
| CN110607429A (en) * | 2019-09-27 | 2019-12-24 | 中冶南方（武汉）热工有限公司 | Roller hearth type plate continuous furnace and tempering method thereof |
| CN113278779A (en) * | 2021-04-30 | 2021-08-20 | 江门市广进铸锻有限公司 | Normalizing and tempering production process and normalizing and tempering furnace for improving product quality and yield |
| CN115449610A (en) * | 2022-09-27 | 2022-12-09 | 中冶南方（武汉）热工有限公司 | Open fire heating and non-oxidation soaking heat treatment furnace and heat treatment method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104846185A (en) * | 2015-04-21 | 2015-08-19 | 武汉钢铁(集团)公司 | Alloying furnace holding-section atmoseal furnace temperature compensation device |
| CN108546815A (en) * | 2018-04-20 | 2018-09-18 | 特诺恩技术（天津）有限公司 | Wide and Thick Slab roller bottom furnace system with strong convection circulator |
| CN108787906A (en) * | 2018-08-16 | 2018-11-13 | 艾伯纳工业炉(太仓)有限公司 | A kind of roller-bottom type aluminum alloy heat forming furnace |
| CN109013924A (en) * | 2018-08-16 | 2018-12-18 | 艾伯纳工业炉(太仓)有限公司 | Roller-bottom type aluminum alloy heat forming furnace |
| CN110257596A (en) * | 2019-07-17 | 2019-09-20 | 艾伯纳工业炉(太仓)有限公司 | A kind of tempering furnace |
| CN110607429A (en) * | 2019-09-27 | 2019-12-24 | 中冶南方（武汉）热工有限公司 | Roller hearth type plate continuous furnace and tempering method thereof |
| CN110607429B (en) * | 2019-09-27 | 2021-03-16 | 中冶南方（武汉）热工有限公司 | Roller hearth type plate continuous furnace and tempering method thereof |
| CN113278779A (en) * | 2021-04-30 | 2021-08-20 | 江门市广进铸锻有限公司 | Normalizing and tempering production process and normalizing and tempering furnace for improving product quality and yield |
| CN115449610A (en) * | 2022-09-27 | 2022-12-09 | 中冶南方（武汉）热工有限公司 | Open fire heating and non-oxidation soaking heat treatment furnace and heat treatment method |
| CN115449610B (en) * | 2022-09-27 | 2023-11-03 | 中冶南方（武汉）热工有限公司 | Heat treatment furnace for open fire heating and non-oxidation soaking and heat treatment method |
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