CN107470377A - Steel band manufacture streamline is incubated annealing device online - Google Patents
Steel band manufacture streamline is incubated annealing device online Download PDFInfo
- Publication number
- CN107470377A CN107470377A CN201710853613.3A CN201710853613A CN107470377A CN 107470377 A CN107470377 A CN 107470377A CN 201710853613 A CN201710853613 A CN 201710853613A CN 107470377 A CN107470377 A CN 107470377A
- Authority
- CN
- China
- Prior art keywords
- stay
- warm case
- chassis
- coil strip
- steel coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000137 annealing Methods 0.000 title claims abstract description 13
- 239000010410 layer Substances 0.000 claims abstract description 33
- 239000011241 protective layer Substances 0.000 claims abstract description 21
- 230000005855 radiation Effects 0.000 claims abstract description 17
- 238000009413 insulation Methods 0.000 claims abstract description 15
- 238000011534 incubation Methods 0.000 claims abstract description 14
- 239000002131 composite material Substances 0.000 claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000000463 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
- 238000003466 welding Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 13
- 238000005098 hot rolling Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 3
- 238000010583 slow cooling Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/008—Heat shields
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Thermal Insulation (AREA)
Abstract
The invention discloses steel band manufacture streamline to be incubated annealing device, including steel coil strip pallet and stay-warm case online, and steel coil strip pallet upper end is provided with V-shaped groove, and steel coil strip pallet lower end is connected with streamline, and a rectangle chassis is provided with the middle part of steel coil strip pallet；Stay-warm case surrounds incubation cavity on chassis, and cavity shape and the steel coil strip matching on stay-warm case top are curved, and in a tubular form, cross section and the chassis of stay-warm case bottom match for stay-warm case bottom；Chassis and stay-warm case are multilayer composite heat insulating structure, and multilayer composite heat insulating structure includes radiation heat-reflecting layer, thermal insulation layer and protective layer；Radiation heat-reflecting layer is arranged at the inner surface of incubation cavity；Protective layer is arranged at the outer surface of incubation cavity；Thermal insulation layer is arranged between radiation heat-reflecting layer and protective layer.Nationality of the present invention is prevented steel coil strip from being deformed because substantial temperature change occurs in conveying process, is eliminated the influence to subsequent handling by setting insulation annealing device in the conveying process of the steel coil strip Jing Guo hot rolling.
Description
Technical field
The present invention relates to steel band manufacturing equipment technical field, more particularly to steel band manufacture streamline is incubated slow cooling dress online
Put.
Background technology
In existing steel band production technology, the Continuous maching of hot rolling and cold rolling multiple working procedure is realized using streamline,
And high-quality steel band is enough efficiently produced by special streamline.
But in the production of reality, blank is actually to be conveyed in open environment, and this just makes steel band exist
Significantly temperature change occurs in conveying process, is particularly being sent to the mistake of cold rolling after hot rolling is rolled into steel coil strip in blank
Cheng Zhong, temperature occurs and declines because conveying process steel coil strip loses substantial amounts of heat, and then steel band is deformed, to afterwards
Cold rolling process bring harmful effect.
Therefore, it is badly in need of being improved existing steel band production line, occurs in steel band in conveying process significantly warm
The part increase heat-preserving equipment of degree change, makes steel coil strip uniform decrease in temperature in the case of controllable, prevents steel band because of significantly temperature
Change and deform, eliminate the influence to subsequent handling.
The content of the invention
In view of the drawbacks described above of prior art, the present invention provides steel band manufacture streamline and is incubated annealing device online, real
The existing first purpose is to prevent steel band from being deformed because substantial temperature change occurs in conveying process, is eliminated to subsequent handling
Influence.
To achieve the above object, the invention discloses steel band manufacture streamline to be incubated annealing device, including steel coil strip online
Pallet and stay-warm case.
Wherein, the steel coil strip pallet upper end is provided with V-shaped groove, and the V-shaped groove is used to lay steel coil strip, the steel coil strip support
Disk lower end is connected with streamline, is provided with a rectangle chassis in the middle part of the steel coil strip pallet, the chassis is parallel with the streamline
Set；
The stay-warm case surrounds incubation cavity, cavity shape and the steel band on the stay-warm case top on the chassis
Volume matching is curved, and in a tubular form, cross section and the chassis of the stay-warm case bottom match for the stay-warm case bottom；
The chassis and the stay-warm case are multilayer composite heat insulating structure, and the multilayer composite heat insulating structure includes radiation
Heat-reflecting layer, thermal insulation layer and protective layer；
The radiation heat-reflecting layer is arranged at the inner surface of the incubation cavity, and the radiation heat-reflecting layer surface is smooth；
The protective layer is arranged at the outer surface of the incubation cavity, and the protective layer is provided with netted reinforcement knot
Structure；
The thermal insulation layer is arranged between the radiation heat-reflecting layer and the protective layer.
Preferably, the radiation heat-reflecting layer is made of stainless steel cold-rolled plate.
Preferably, the protective layer used steel plate is made, and sets the reinforcing rib structure outside it with welding manner.
Preferably, the thermal insulation layer is made of ceramic fibre material, and is fixed on anchor studs in the protective layer.
Preferably, the edge part on the chassis is equipped with the groove of upward opening, the width of four grooves
Wall thickness with the stay-warm case matches；When the stay-warm case is covered on the chassis, under the rectangular tubulose in chassis
End is connected in four grooves.
Beneficial effects of the present invention：
Nationality of the present invention by the steel coil strip Jing Guo hot rolling conveying process set insulation annealing device, prevent steel coil strip because
Substantial temperature change occurs in conveying process and deforms, eliminates the influence to subsequent handling.
Nationality of the present invention radiates the incubation cavity pair of heat-reflecting layer inner surface and intermediate thermal insulating layer by being provided with outside steel coil strip
Steel coil strip carries out insulation slow cooling, can have the effective loss for preventing steel band heat, slow down the cooling rate of steel band, prevent steel coil strip
Deformed because substantial temperature change occurs in conveying process.
Design, concrete structure and the caused technique effect of the present invention are described further below with reference to accompanying drawing, with
It is fully understood from the purpose of the present invention, feature and effect.
Brief description of the drawings
Fig. 1 shows the structural representation of one embodiment of the invention.
Fig. 2 shows to be incubated the structural representation of cover outer surface in one embodiment of the invention.
Embodiment
Embodiment
As depicted in figs. 1 and 2, steel band manufacture streamline is incubated annealing device, including steel coil strip pallet 1 and stay-warm case online
2。
Wherein, the upper end of steel coil strip pallet 1 is provided with V-shaped groove 11, and V-shaped groove 11 is used to laying steel coil strip 9, under steel coil strip pallet 1
End is connected with streamline 8, and the middle part of steel coil strip pallet 1 is provided with a rectangle chassis 12, and chassis 12 be arranged in parallel with streamline 8；
Stay-warm case 2 surrounds incubation cavity on chassis 12, and it is in arc that the cavity shape on the top of stay-warm case 2 matches with steel coil strip 9
Shape, in a tubular form, cross section and the chassis 12 of the bottom of stay-warm case 2 match the bottom of stay-warm case 2；
Chassis 12 and stay-warm case 2 are multilayer composite heat insulating structure, and multilayer composite heat insulating structure includes radiation heat-reflecting layer
3rd, thermal insulation layer 4 and protective layer 5；
Radiation heat-reflecting layer 3 is arranged at the inner surface of incubation cavity, and radiation heat-reflecting layer 3 surface is smooth；
Protective layer 5 is arranged at the outer surface of incubation cavity, and protective layer 5 is provided with netted reinforcing rib structure 21；
Thermal insulation layer 4 is arranged between radiation heat-reflecting layer 3 and protective layer 5.
The principle of the present invention is that nationality outside steel coil strip 9 by being provided with the radiation inner surface of heat-reflecting layer 3 and middle spaced heat
The incubation cavity of layer 4 carries out insulation slow cooling to steel coil strip 9, can have the effective loss for preventing steel band heat, slow down the cooling of steel band
Speed, prevent steel coil strip from being deformed because substantial temperature change occurs in conveying process.
In certain embodiments, radiation heat-reflecting layer 3 is made of stainless steel cold-rolled plate.
In certain embodiments, protective layer 5 is made of steel plate, and reinforcing rib structure is set outside it with welding manner
21。
In certain embodiments, thermal insulation layer 4 is made of ceramic fibre material, and is fixed on anchor studs in protective layer.
In certain embodiments, the edge part on chassis is equipped with the groove of upward opening, the width of four grooves
Wall thickness with stay-warm case matches；When stay-warm case is covered on chassis, the lower end of the rectangular tubulose in chassis is connected to four grooves
It is interior.
Preferred embodiment of the invention described in detail above.It should be appreciated that one of ordinary skill in the art without
Creative work can is needed to make many modifications and variations according to the design of the present invention.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical scheme, all should be in the protection domain being defined in the patent claims.
Claims (5)
1. steel band manufacture streamline is incubated annealing device, including steel coil strip pallet (1) and stay-warm case (2) online；Characterized in that,
Steel coil strip pallet (1) upper end is provided with V-shaped groove (11), and the V-shaped groove (11) is used to lay steel coil strip (9), the steel coil strip
Pallet (1) lower end is connected with streamline (8), and a rectangle chassis (12), the chassis are provided with the middle part of the steel coil strip pallet (1)
(12) it is be arranged in parallel with the streamline (8)；
The stay-warm case (2) surrounds incubation cavity, the cavity shape on stay-warm case (2) top and institute on the chassis (12)
State steel coil strip (9) match it is curved, stay-warm case (2) bottom in a tubular form, the cross section of stay-warm case (2) bottom with it is described
Chassis (12) matches；
The chassis (12) and the stay-warm case (2) are multilayer composite heat insulating structure, and the multilayer composite heat insulating structure includes
Radiate heat-reflecting layer (3), thermal insulation layer (4) and protective layer (5)；
The radiation heat-reflecting layer (3) is arranged at the inner surface of the incubation cavity, and described radiation heat-reflecting layer (3) surface is smooth；
The protective layer (5) is arranged at the outer surface of the incubation cavity, and the protective layer (5) is provided with netted reinforcement knot
Structure (21)；
The thermal insulation layer (4) is arranged between the radiation heat-reflecting layer (3) and the protective layer (5).
2. steel band manufacture streamline according to claim 1 is incubated annealing device online, it is characterised in that the radiant heat
Reflecting layer (3) is made of stainless steel cold-rolled plate.
3. steel band manufacture streamline according to claim 1 is incubated annealing device online, it is characterised in that the protective layer
(5) it is made of steel plate, and the reinforcing rib structure (21) is set with welding manner outside it.
4. steel band manufacture streamline according to claim 1 is incubated annealing device online, it is characterised in that the thermal insulation layer
(4) it is made of ceramic fibre material, and is fixed on anchor studs in the protective layer.
5. steel band manufacture streamline according to claim 1 is incubated annealing device online, it is characterised in that the chassis
Edge part is equipped with the groove of upward opening, and the wall thickness of the width of four grooves with the stay-warm case matches；
When the stay-warm case is covered on the chassis, the lower end of the rectangular tubulose in chassis is connected in four grooves.
Priority Applications (23)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710853613.3A CN107470377A (en) | 2017-09-20 | 2017-09-20 | Steel band manufacture streamline is incubated annealing device online |
| 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 |
| EP18857665.6A EP3686296A4 (en) | 2017-09-20 | 2018-09-20 | Softening method for high-strength q p steel hot roll |
| PCT/CN2018/106709 WO2019057116A1 (en) | 2017-09-20 | 2018-09-20 | Hot-rolling online movable thermal insulation heat treatment process, and heat treatment line |
| JP2020537824A JP7320512B2 (en) | 2017-09-20 | 2018-09-20 | Method for softening high-strength Q&P steel hot-rolled coil |
| PCT/CN2018/106712 WO2019057117A1 (en) | 2017-09-20 | 2018-09-20 | Movable hot rolling thermal insulation heat treatment device |
| KR1020207010725A KR102397795B1 (en) | 2017-09-20 | 2018-09-20 | Movable Hot Rolling Thermal Insulation Heat Treatment Equipment |
| PCT/CN2018/106706 WO2019057115A1 (en) | 2017-09-20 | 2018-09-20 | Production method for inline increase in precipitation toughening effect of ti microalloyed hot-rolled high-strength steel |
| JP2020537825A JP7320513B2 (en) | 2017-09-20 | 2018-09-20 | Inline Production Method for Improving Precipitation Strengthening Effect of Ti Micro-alloyed Hot-rolled High-strength Steel |
| EP18857961.9A EP3686298A4 (en) | 2017-09-20 | 2018-09-20 | Fixed type hot coil thermal insulation heat treatment device |
| EP18858067.4A EP3686292A4 (en) | 2017-09-20 | 2018-09-20 | Production method for inline increase in precipitation toughening effect of ti microalloyed hot-rolled high-strength steel |
| US16/648,781 US11981972B2 (en) | 2017-09-20 | 2018-09-20 | Softening method for high-strength Q and P steel hot roll |
| KR1020207010904A KR102452599B1 (en) | 2017-09-20 | 2018-09-20 | Production method to improve the precipitation strengthening effect of Ti microalloyed hot-rolled high-strength steel in-line |
| JP2020537826A JP7253558B2 (en) | 2017-09-20 | 2018-09-20 | Hot rolling in-line moving thermal insulation heat treatment process and heat treatment line |
| PCT/CN2018/106703 WO2019057114A1 (en) | 2017-09-20 | 2018-09-20 | Softening method for high-strength q＆p steel hot roll |
| EP18857666.4A EP3686297B1 (en) | 2017-09-20 | 2018-09-20 | Movable hot rolling thermal insulation heat treatment device |
| JP2020537827A JP7135091B2 (en) | 2017-09-20 | 2018-09-20 | Mobile hot coil thermal insulation heat treatment equipment |
| EP18859703.3A EP3685931B1 (en) | 2017-09-20 | 2018-09-20 | Hot-rolling online movable thermal insulation heat treatment process, and heat treatment line |
| KR1020207010727A KR20200066630A (en) | 2017-09-20 | 2018-09-20 | Hot rolling online mobile heat insulation heat treatment process, and heat treatment line |
| US16/648,773 US11384406B2 (en) | 2017-09-20 | 2018-09-20 | Production method for inline increase in precipitation toughening effect of Ti microalloyed hot-rolled high-strength steel |
| KR1020207010903A KR102452598B1 (en) | 2017-09-20 | 2018-09-20 | Softening method of high-strength Q&P steel hot-rolled roll |
| KR1020207010726A KR102397796B1 (en) | 2017-09-20 | 2018-09-20 | Stationary Hot Coil Thermal Insulation Heat Treatment Equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710853613.3A CN107470377A (en) | 2017-09-20 | 2017-09-20 | Steel band manufacture streamline is incubated annealing device online |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107470377A true CN107470377A (en) | 2017-12-15 |
Family
ID=60587073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710853613.3A Pending CN107470377A (en) | 2017-09-20 | 2017-09-20 | Steel band manufacture streamline is incubated annealing device online |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107470377A (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108559834A (en) * | 2018-06-19 | 2018-09-21 | 宝钢湛江钢铁有限公司 | A kind of fixed hot rolling heat preservation annealing device |
| WO2019057114A1 (en) | 2017-09-20 | 2019-03-28 | 宝钢湛江钢铁有限公司 | Softening method for high-strength q＆p steel hot roll |
| WO2019057116A1 (en) * | 2017-09-20 | 2019-03-28 | 宝钢湛江钢铁有限公司 | Hot-rolling online movable thermal insulation heat treatment process, and heat treatment line |
| WO2019057118A1 (en) * | 2017-09-20 | 2019-03-28 | 宝钢湛江钢铁有限公司 | Fixed type hot coil thermal insulation heat treatment device |
| WO2019057115A1 (en) | 2017-09-20 | 2019-03-28 | 宝钢湛江钢铁有限公司 | Production method for inline increase in precipitation toughening effect of ti microalloyed hot-rolled high-strength steel |
| CN110314940A (en) * | 2018-03-30 | 2019-10-11 | 宝山钢铁股份有限公司 | A kind of insulation cover for the heat preservation of hot rolled strip flanging part |
| WO2019242565A1 (en) * | 2018-06-19 | 2019-12-26 | 宝山钢铁股份有限公司 | Method for manufacturing cold-rolled or zinc-plated dual-phase steel plate over 980 mpa |
| CN110616307A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Hot rolling strip steel heat treatment line |
| CN110616306A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Hot rolling on-line mobile heat preservation heat treatment process |
| CN110616299A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Production method of high-strength steel |
| CN110614280A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Online hot coil temperature homogenization treatment method |
| CN110616302A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Softening method of high-strength Q & P steel hot-rolled coil |
| CN110614281A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Method for improving iron scale adhesion of hot-rolled black steel product |
| CN110616301A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Production method for improving precipitation strengthening effect of Ti microalloyed hot-rolled high-strength steel on line |
| CN110614283A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Dew point method for preventing surface oxidation of steel coil in heat-insulating cover |
| CN113146081A (en) * | 2021-03-30 | 2021-07-23 | 广西天正钢结构有限公司 | Steel structure bridge truss welding tool and welding method |
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019057114A1 (en) | 2017-09-20 | 2019-03-28 | 宝钢湛江钢铁有限公司 | Softening method for high-strength q＆p steel hot roll |
| WO2019057116A1 (en) * | 2017-09-20 | 2019-03-28 | 宝钢湛江钢铁有限公司 | Hot-rolling online movable thermal insulation heat treatment process, and heat treatment line |
| WO2019057118A1 (en) * | 2017-09-20 | 2019-03-28 | 宝钢湛江钢铁有限公司 | Fixed type hot coil thermal insulation heat treatment device |
| WO2019057115A1 (en) | 2017-09-20 | 2019-03-28 | 宝钢湛江钢铁有限公司 | Production method for inline increase in precipitation toughening effect of ti microalloyed hot-rolled high-strength steel |
| US11384406B2 (en) | 2017-09-20 | 2022-07-12 | Baosteel Zhanjian Iron & Steel Co., Ltd. | Production method for inline increase in precipitation toughening effect of Ti microalloyed hot-rolled high-strength steel |
| CN110314940B (en) * | 2018-03-30 | 2020-08-25 | 宝山钢铁股份有限公司 | Heat preservation cover for heat preservation of hot rolled steel strip coil edge part |
| CN110314940A (en) * | 2018-03-30 | 2019-10-11 | 宝山钢铁股份有限公司 | A kind of insulation cover for the heat preservation of hot rolled strip flanging part |
| CN110616303A (en) * | 2018-06-19 | 2019-12-27 | 宝山钢铁股份有限公司 | Manufacturing method of 980MPa grade or above cold-rolled or galvanized dual-phase steel plate |
| CN110616307A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Hot rolling strip steel heat treatment line |
| CN110616299A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Production method of high-strength steel |
| CN110614280A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Online hot coil temperature homogenization treatment method |
| CN110616302A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Softening method of high-strength Q & P steel hot-rolled coil |
| CN108559834A (en) * | 2018-06-19 | 2018-09-21 | 宝钢湛江钢铁有限公司 | A kind of fixed hot rolling heat preservation annealing device |
| CN110614281A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Method for improving iron scale adhesion of hot-rolled black steel product |
| CN110616301A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Production method for improving precipitation strengthening effect of Ti microalloyed hot-rolled high-strength steel on line |
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