CN110303047A - A kind of hot core rolling system of continuous casting and method - Google Patents
A kind of hot core rolling system of continuous casting and method Download PDFInfo
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- CN110303047A CN110303047A CN201910611459.8A CN201910611459A CN110303047A CN 110303047 A CN110303047 A CN 110303047A CN 201910611459 A CN201910611459 A CN 201910611459A CN 110303047 A CN110303047 A CN 110303047A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/14—Plants for continuous casting
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Abstract
The present invention relates to a kind of hot core rolling system of continuous casting and methods, belong to metal material rolling field, the hot core rolling system of continuous casting of the present invention includes: continuous casting line, hot core rolling line and continuous casting transmission line, continuous casting line respectively with hot core rolling line, the connection of continuous casting transmission line, wherein, the end of continuous casting line is provided with thermometric feedback device, thermometric feedback device is used to measure the surface temperature and core temperature of the slab after Length-fixing cutting process in continuous casting line, thermometric feedback device connects a screening system, surface temperature and core temperature of the screening system according to measurement, slab after determining Length-fixing cutting process enters hot core rolling line or continuous casting transmission line, screening system connects the starting point of hot the core rolling line and continuous casting transmission line by means of pusher structure, this system can preferably efficiently use continuous casting The waste heat that process generates, while the up-to-standard slab produced.
Description
Technical field
The present invention relates to metal material rolling field more particularly to a kind of hot core rolling system of continuous casting and methods.
Background technique
Green rolling, energy-saving and emission-reduction are increasingly becoming a significant concern field in pressure processing field, and steel practitioner is logical
The implementation of new technologies and methods is crossed, thus realize the energy consumption reduced in the operation of rolling while Improving The Quality of Products, it is universal at present
Technology of application such as continuous casting billet hot-loading and hot-conveying, Direct Rolling, continuous casting billet weight Reduction Technology etc..Either novel rolling technique is answered
With, or the conventional hot rolling technique of tradition, crucial and difficult point be that the production of zero defect base is combined with the control in temperature field, thus
Produce the continuous casting billet of high quality.
What the continuous casting process in traditional processing technology was often mutually separated with the operation of rolling, it is generated by continuously casting
Continuous casting billet enters material library through supercooling mostly, even if realizing that hot sending program is directly entered heating furnace, also can not efficiently use
Waste heat caused by continuous casting process wastes the core table temperature difference of continuous casting forward direction temperature gradient.
Instantly well known continuous casting billet pressure mode is broadly divided into wick-containing pressure and hot core depresses two ways.Wick-containing pressure
When, steel billet centre carries out rolling deformation when being liquid, this method utilizes the high fluidity feature of metal in the liquid state, will
High solute metal rich region squeezes back in liquid core, to realize that core quality controls.Wick-containing Reduction Technology utilizes company simultaneously
Waste heat deformation is cast, heat waste is small, energy conservation and environmental protection.Such as Authorization Notice No. is CN 102189102, the day for announcing is on 2 6th, 2013,
In the Chinese patent literature of entitled " a kind of big pressure liquid core rolling method of the online doctor roll formula of conticaster ", in slab caster
The duo mill of the big roller diameter of a frame is arranged in horizontal segment solidification end, carries out single pass heavy reduction liquid core rolling to slab, thus
Center porosity and segregation, internal fissure etc. are removed, slab quality is improved, refines interior tissue.But this method is to wick-containing position
Control requires height, and under continuous casting the parameter constantly condition of production of dynamic change, accurate positioning solidification end is more difficult, therefore this
The position and reduction system of the single roller mill of kind are difficult to control.
Hot core rolling refers to steel billet in thermal pressure processing, under the positive temperature gradient that core temperature is high, surface temperature is low
Carry out rolling deformation.The difference of hot core rolling and conventional hot rolling is that hot core rolling possesses bigger positive temperature gradient, therefore core
Portion position can obtain bigger plastic deformation in deformation.Such as Authorization Notice No. is CN 104148387, the day for announcing is
On May 4th, 2016, entitled " a kind of hot core milling method of continuous casting " Chinese patent literature in, once cut in casting blank of continuous casting machine
Cut front horizontal segment and carry out hot core pressure close to casting blank solidification end position setting roller mill, this method using continuous casting waste heat into
The online hot core rolling of row, considerably reduces coagulation defect, to obtain the continuous casting billet of high quality.But this method is generous
Base rolling continues to increase in application, passing through the square billet length-width ratio deformed, is that the hole type design of subsequent hot rolled increases difficulty, if hot
The setting of core rolling reduction is larger, or even can not achieve normally biting for subsequent pass, therefore limits the reality of hot core rolling
Reduction system sets space.
Such as Authorization Notice No. is 105618481 B of CN, the day for announcing is on April 26th, 2017, a kind of entitled " continuous casting
In the Chinese patent literature of the convex roller waste heat rolling equipment of base and technique ", the convex roller design of a kind of hot core deformation and offline is disclosed
Arrangement mode, but the arrangement form of the patent does not fully consider the ratio of width to height during billet continuous casting, by deformed continuous casting
Base increases the difficulty of subsequent steel rolling link.
Summary of the invention
(1) technical problems to be solved
In order to solve the above problem of the prior art, the present invention provides a kind of hot core rolling system of continuous casting and method, with solution
Proposed in certainly above-mentioned background technique, the operation of rolling and continuous casting process separation, cannot be efficiently used when currently producing continuous casting billet
The defect for the waste heat that continuous casting process generates, further, even if existing middle presence carries out hot core using waste heat in continuous casting process and rolls
The scheme of system, scheme cannot obtain preferable slab, and the slab quality that existing preparation is produced is unqualified.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include:
A kind of hot core rolling system of continuous casting, comprising:
Continuous casting line, hot core rolling line and continuous casting transmission line；
The continuous casting line is connect with hot core rolling line, continuous casting transmission line respectively, wherein the end of continuous casting line
End is provided with thermometric feedback device；The thermometric feedback device be used for measure in continuous casting line after Length-fixing cutting process
Slab surface temperature and core temperature；
The thermometric feedback device connects a screening system, surface temperature and core temperature of the screening system according to measurement
Degree, the slab after determining the Length-fixing cutting process enter hot core rolling line or continuous casting transmission line；
The screening system connects the starting point of hot the core rolling line and continuous casting transmission line by means of pusher structure.
As the technical program further preferred that
The screening system connects the thermometric feedback device of all continuous casting line ends, and the pusher structure connects institute
The starting point of some continuous casting transmission lines.
As the technical program further preferred that
The continuous casting line includes:
Crystallizer, production roller-way, the last sortie withdrawal straightening machine, the first transmission roller channel being set in sequence；
First transmission roller channel is disposed with scale flame cutting equipment and thermometric feedback device；
Wherein, the crystallizer side has multiple outlets；The starting point of the production roller-way is arranged in the crystallizer
Outlet port；The end of the production roller-way is connect with the last frame withdrawal straightening machine；First transmission roller channel starting point with it is described
Last frame withdrawal straightening machine connection；First transmission roller channel end is connect with the pusher structure；
The continuous casting transmission line includes:
The second transmission roller channel of the pusher structure is connected, the end of second transmission roller channel and strand collecting device connect
It connects；
The hot core rolling line includes:
The third transmission roller channel of the pusher structure is connected, the third transmission roller channel is successively fixedly installed high pressure water and removes
Phosphorus mechanism, the first milling train；The third transmission roller channel initial end is connect with pusher structure end；High pressure dephosphorization mechanism
It is fixed at third transmission roller channel two sides；First milling train is fixed in the third roller-way, to logical
The slab for crossing the first milling train is rolled；
Third transmission roller channel end is connect with strand collecting device；The strand collecting device includes material library or heating
Furnace；
Alternatively, the hot core rolling line includes:
The third transmission roller channel of the pusher structure is connected, the third transmission roller channel is successively fixedly installed tilting gear
Structure, high pressure water dephosphorization mechanism, the second milling train；The third transmission roller channel initial end is connect with pusher structure end；It is described
Turnover is fixed in the third transmission roller channel, and the primary face of the turnover and the third transfer roller
Approximately the same plane；The turnover is used to successively carry out the slab in the transfer roller rotation 90 and states double steel processing, makes
Plane of the long side of the slab cut surface perpendicular to the third transfer roller；
High pressure dephosphorization mechanism is fixed at third transmission roller channel two sides；
Second milling train is fixed in the third transmission roller channel, to carry out to by the slab of the second milling train
Rolling.
As the technical program further preferred that first milling train is vertical roll type milling train.
As the technical program further preferred that second milling train is Horizontal weld type milling train.
As the technical program further preferred that the slab after screening scale process in the screening system enters hot core
The condition of rolling line is that the surface temperature of thermometric feedback device measurement is greater than 800 DEG C, and the core table temperature difference is more than or equal to 200 DEG C；
Wherein, the drafts of first milling train or the second milling train is between 30mm to 60mm.
A kind of hot core milling method includes:
S1, the surface that the slab in each continuous casting line after Length-fixing cutting process is measured using thermometric feedback device
Temperature and core temperature；
The surface temperature and core temperature that S2, screening system are measured according to the thermometric feedback device, determine the scale
Whether the slab after process meets the condition into hot core rolling line；
S3, if it is satisfied, then the slab after thermometric is transferred to hot core rolling line by pusher structure.
As the technical program it is further preferred that the method also includes:
S4, if conditions are not met, then the slab after thermometric is moved to continuous casting transmission line by pusher structure, via continuous casting transmission line
It is fed directly to strand collecting device.
As the technical program it is further preferred that the method also includes:
Turnover in hot core rolling line overturns 90 ° to current slab, and the current slab after overturning passes through high pressure
Water dephosphorization mechanism carries out dephosphorization processing；
Rolling process is carried out by Horizontal weld type milling train via dephosphorization treated current slab；
Current slab after rolling process is delivered to strand collecting device.
As the technical program it is further preferred that the method also includes: on hot core rolling line via thermometric
Slab afterwards directly passes through high pressure water dephosphorization mechanism and carries out dephosphorization processing；
Rolling process is carried out by vertical roll type milling train via dephosphorization treated current slab；
Current slab after rolling process is delivered to strand collecting device.
(3) beneficial effect
The beneficial effects of the present invention are: passing through the combination of rolling line and continuous casting line, the company of effective use is made it possible to
Casting process generate waste heat, improve production efficiency, and continuous casting system through the invention can prepare it is up-to-standard
Slab.
Detailed description of the invention
Fig. 1 is the flow chart of the present invention using double steel processing method；
Fig. 2 is the flow chart of the present invention using vertical roll type milling train method；
Fig. 3 is the equipment top view of the present invention using vertical roll type milling train method；
Fig. 4 is the equipment top view of the present invention using double steel processing method；
Fig. 5 is the equipment main view of the present invention using double steel processing method.
[description of symbols]
1: crystallizer；
2: production roller-way；
3: last sortie withdrawal straightening machine；
4: scale flame-cutting plant；
5: pusher structure；
6: turnover；
7: high pressure water dephosphorization mechanism；
8: Horizontal weld type milling train；
9: strand collecting device；
10: vertical roll type milling train；
A: thermometric feedback device.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.
Embodiment 1
Fig. 2-3 is please referred to, liquid metal realizes that scull process forms slab from more than 1 outlet outflows of crystallizer, passes through life
Roller-way 2 is produced gradually to run to last sortie withdrawal straightening machine position.After last frame withdrawal straightening machine 3 completes straightening process, cut by scale flame
Equipment 4 is cut, slab is cut into specified size.The initial position of scale flame-cutting plant is in the end withdrawal straightening machine distance
Between 1m to 2m.The slab of Length-fixing cutting process is completed, measured feedback device A carries out temperature detection, and by anti-with thermometric
The screening system of device connection is presented to progress blank screening.The continuous casting material for meeting rolling condition is pushed to using pusher structure 5
Transmit hot core rolling line；The slab for not meeting rolling condition is transported along the first transmission roller channel by static pusher structure
To continuous casting transmission line.Be transferred to the slab of hot core rolling line, by third transmission roller channel enter high pressure water dephosphorization mechanism 7 into
Row dephosphorization removes the scale on surface formed during slab cooling, and water there is cooling effect further to increase surface simultaneously
Be conducive to deform the core table temperature difference permeated to core.After the completion of dephosphorization, big specification rolling is carried out using vertical roll type milling train 10 and is become
Shape.The continuous casting billet for completing rolling mill practice enters strand collecting device 9, realizes Cold assembly technology or hot-loading and hot-conveying technique.Minimum open rolling
Temperature TR-minUsing continuous casting billet surface measurement temperature, and producing line models for temperature field is cooperated to carry out central temperature calculating, guarantees big pressure
The minimum open rolling surface temperature T of lower techniqueR-min>=800 DEG C, and T >=200 DEG C core table temperature difference △.
The setting of roll reduction △ H should meet operation of rolling pressing casting flaw, fully consider the peace of milling train again
Full roll torque to sum up chooses 30mm≤△ H≤60mm.
The continuous casting process of slab and the operation of rolling are combined in the present embodiment, obtain the waste heat generated in production process
Effective utilization, while the milling train used is vertical roll type milling train, the direction of rolling and the longest edge for being parallel to slab cut surface
Direction, make to produce up-to-standard slab.The initial position of scale flame-cutting plant is in the end in the present embodiment
Withdrawal straightening machine distance is between 1m to 2m, due to being closer, to improve the integral cutting face temperature of slab when completing scale, is
Hot core rolling provides broader rolling deformation temperature field.
Embodiment 2
Fig. 1, Fig. 4 and Fig. 5 are please referred to, liquid metal realizes that scull process forms slab from more than 1 outlet outflows of crystallizer,
It is gradually run by producing roller-way 2 to last frame withdrawal straightening machine position, after last frame withdrawal straightening machine 3 completes straightening process, uses Forward
Slab is cut into specified size cutting by scale flame cutting equipment 4.Complete the slab of Length-fixing cutting process, measured feedback
Device A carries out temperature detection, and is screened by screening system, and the slab of rolling condition is met, and is pushed using pusher structure 5
To hot core rolling line；The slab for not meeting rolling condition is transported to along the first transmission roller channel by static pusher structure
Continuous casting transmission line.It is transferred to the slab of hot core roll line, double steel processing is carried out using turnover 6, makes cut surface maximum height
Direction is rolling direction.The blank for completing double steel program enters high pressure water dephosphorization mechanism 7 and carries out dephosphorization removing slab cooling process
The scale on surface of middle formation, water, which simultaneously further increases surface with cooling effect, to be conducive to deform to core infiltration
Core table temperature difference.After the completion of dephosphorization, big specification rolling deformation is carried out using Horizontal weld type milling train 8.Complete the continuous casting of rolling mill practice
Base enters strand collecting device 9, realizes Cold assembly technology or hot-loading and hot-conveying technique.Wherein turnover 6 is able to achieve 90 ° of rotation double steels
Function, make the longest edge of slab cut surface perpendicular to the plane of third transmission roller channel, at this point, Horizontal weld type milling train 8 is with parallel
It is rolled in the direction of slab cut surface longest edge.
Minimum start rolling temperature TR-minUsing continuous casting billet surface measurement temperature, and producing line models for temperature field is cooperated to carry out center temperature
Degree calculates, and guarantees minimum open rolling surface temperature TR-min >=800 DEG C of big soft reduction process, and T >=200 DEG C core table temperature difference △.
The setting of roll reduction △ H should meet operation of rolling pressing casting flaw, fully consider the peace of milling train again
Full roll torque to sum up chooses 30mm≤△ H≤60mm.
The setting for rolling linear velocity, fully considers conticaster fluxion and pusher ability, to choose rolling appropriate
Rate parameter, to realize the one big purpose depressing milling train and combining with Multi-strand Continuous Casting producing line.
The continuous casting process of slab and the operation of rolling are combined in the present embodiment, obtain the waste heat generated in production process
Effective utilization, and 90 ° of rotation double steels are carried out to slab using turnover and are handled, while the milling train used is Horizontal weld type
Milling train, the direction in the direction of rolling and the longest edge for being parallel to slab cut surface, makes to produce up-to-standard slab.This implementation
The screening system used in example is screened to whether slab meets rolling condition, improves production efficiency.
Embodiment 3
Table 1
By taking 300mm × 360mm slab is in certain producing line section as an example, design for continuous casting machine is the production of four, crystallizer outlets
Line.
With last frame withdrawal straightening machine for 0 moment, temperature measuring parameter is respectively flowed in temperature measuring point and model calculating parameter is as shown in table 1.Table
In whether have and also embodied using the demand of mill milling for different steel grades, come whether comprehensive judgement realizes rolling with this
Process.
Model in table 1 calculates column, is calculated according to model, calculates the anticipation of subsequent temperature drop, to the big pressure of the hot core of determination
The feasibility of lower technique.
Finally, it should be noted that above-described embodiments are merely to illustrate the technical scheme, rather than to it
Limitation；Although the present invention is described in detail referring to the foregoing embodiments, those skilled in the art should understand that:
It can still modify to technical solution documented by previous embodiment, or to part of or all technical features into
Row equivalent replacement；And these modifications or substitutions, so that the essence in corresponding technical solution is detached from various embodiments of the present invention technology
The range of scheme.
Claims (10)
1. a kind of hot core rolling system of continuous casting characterized by comprising
Continuous casting line, hot core rolling line and continuous casting transmission line；
The continuous casting line is connect with hot core rolling line, continuous casting transmission line respectively, wherein the end of continuous casting line is set
It is equipped with thermometric feedback device；The thermometric feedback device is used to measure the casting after Length-fixing cutting process in continuous casting line
The surface temperature and core temperature of base；
One screening system of the thermometric feedback device connection, surface temperature and core temperature of the screening system according to measurement,
Slab after determining the Length-fixing cutting process enters hot core rolling line or continuous casting transmission line；
The screening system connects the starting point of hot the core rolling line and continuous casting transmission line by means of pusher structure.
2. the hot core rolling system of continuous casting according to claim 1, which is characterized in that
The screening system connects the thermometric feedback device of all continuous casting line ends, and the pusher structure connect it is all
The starting point of continuous casting transmission line.
3. the hot core rolling system of continuous casting according to claim 1 or 2, which is characterized in that
The continuous casting line includes:
Crystallizer, production roller-way, the last sortie withdrawal straightening machine, the first transmission roller channel being set in sequence；
First transmission roller channel is disposed with scale flame cutting equipment and thermometric feedback device；
Wherein, the crystallizer side has multiple outlets；The starting point setting of the production roller-way is exported in the crystallizer
Position；The end of the production roller-way is connect with the last frame withdrawal straightening machine；First transmission roller channel starting point and the last frame
Withdrawal straightening machine connection；First transmission roller channel end is connect with the pusher structure；
The continuous casting transmission line includes:
The second transmission roller channel of the pusher structure is connected, the end of second transmission roller channel is connect with strand collecting device；
The hot core rolling line includes:
The third transmission roller channel of the pusher structure is connected, the third transmission roller channel is successively fixedly installed high pressure water dephosphorizing machine
Structure, the first milling train；
Third transmission roller channel end is connect with strand collecting device；The strand collecting device includes material library or heating furnace；
Alternatively, the hot core rolling line includes:
The third transmission roller channel of the pusher structure is connected, the third transmission roller channel is successively fixedly installed turnover, height
Ya Shui dephosphorization mechanism, the second milling train.
4. the hot core rolling system of continuous casting according to claim 3, which is characterized in that first milling train rolls for vertical roll type
Machine.
5. the hot core rolling system of continuous casting according to claim 3, which is characterized in that second milling train rolls for Horizontal weld type
Machine.
6. the hot core rolling system of continuous casting according to claim 3, which is characterized in that screen scale work in the screening system
The condition that slab after sequence enters hot core rolling line is that the surface temperature that thermometric feedback device measures is greater than 800 DEG C, core table
The temperature difference is more than or equal to 200 DEG C；
Wherein, the drafts of first milling train or the second milling train is between 30mm to 60mm.
7. a kind of hot core milling method based on any system of claim 1 to 6 characterized by comprising
S1, the surface temperature that the slab in each continuous casting line after Length-fixing cutting process is measured using thermometric feedback device
And core temperature；
The surface temperature and core temperature that S2, screening system are measured according to the thermometric feedback device, determine the scale process
Whether slab afterwards meets the condition into hot core rolling line；
S3, if it is satisfied, then the slab after thermometric is transferred to hot core rolling line by pusher structure.
8. hot core milling method according to claim 7, which is characterized in that the method also includes:
S4, if conditions are not met, then the slab after thermometric is moved to continuous casting transmission line by pusher structure, it is direct via continuous casting transmission line
It is delivered to strand collecting device.
9. hot core milling method according to claim 7, which is characterized in that the method also includes:
Turnover in hot core rolling line overturns 90 ° to current slab, and the current slab after overturning is removed by high pressure water
Phosphorus mechanism carries out dephosphorization processing；
Rolling process is carried out by Horizontal weld type milling train via dephosphorization treated current slab；
Current slab after rolling process is delivered to strand collecting device.
10. hot core milling method according to claim 7, which is characterized in that the method also includes: hot core Rolling Production
Directly pass through the progress dephosphorization processing of high pressure water dephosphorization mechanism via the slab after thermometric on line；
Rolling process is carried out by vertical roll type milling train via dephosphorization treated current slab；
Current slab after rolling process is delivered to strand collecting device.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110899648A (en) * | 2019-11-08 | 2020-03-24 | 河钢股份有限公司 | Continuous casting method for improving internal quality of bearing steel continuous casting billet |
| CN112453051A (en) * | 2020-09-28 | 2021-03-09 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for producing high-strength steel by high permeability of conventional rolling mill |
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| JPH11254115A (en) * | 1998-03-09 | 1999-09-21 | Daido Steel Co Ltd | Method for on-line judging surface quality of cast slab and steel slab in continuous casting and blooming and judging instrument |
| CN104174659A (en) * | 2014-07-11 | 2014-12-03 | 中冶东方工程技术有限公司 | Liquid-core high-pressure rolling temperature control method |
| CN107008750A (en) * | 2017-04-20 | 2017-08-04 | 中冶南方工程技术有限公司 | The long material continuous casting and rolling production line of binary channels and its production method |
| CN206763596U (en) * | 2017-04-20 | 2017-12-19 | 中冶南方工程技术有限公司 | The long material continuous casting and rolling production line of binary channels |
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| US5915457A (en) * | 1995-07-31 | 1999-06-29 | Mannesmann Aktiengesellschaft | Method for operating a continuous casting plant |
| JPH11254115A (en) * | 1998-03-09 | 1999-09-21 | Daido Steel Co Ltd | Method for on-line judging surface quality of cast slab and steel slab in continuous casting and blooming and judging instrument |
| CN104174659A (en) * | 2014-07-11 | 2014-12-03 | 中冶东方工程技术有限公司 | Liquid-core high-pressure rolling temperature control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110899648A (en) * | 2019-11-08 | 2020-03-24 | 河钢股份有限公司 | Continuous casting method for improving internal quality of bearing steel continuous casting billet |
| CN112453051A (en) * | 2020-09-28 | 2021-03-09 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for producing high-strength steel by high permeability of conventional rolling mill |
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| CN110303047B (en) | 2020-11-03 |
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