CN107695113B - A method of it swinging cooling technique and produces think gauge bridge steel - Google Patents
A method of it swinging cooling technique and produces think gauge bridge steel Download PDFInfo
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- CN107695113B CN107695113B CN201710822881.9A CN201710822881A CN107695113B CN 107695113 B CN107695113 B CN 107695113B CN 201710822881 A CN201710822881 A CN 201710822881A CN 107695113 B CN107695113 B CN 107695113B
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- 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
- B21B45/02—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 for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
- B21B37/76—Cooling control on the run-out table
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- 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
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- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A method of it swinging cooling technique and produces think gauge bridge steel, belong to bridge steel production technical field.Collector flow is first set, collector quantity is opened and sets number of oscillations in ACC, number of oscillations is 3 or 5 times；It before entering ACC water cooling area to water cooling steel plate, is switched to manual mode and inputs collector flow, set 0.5~1m/s of roller table speed；After entering ACC water cooling area with steel plate, collector is successively opened along steel plate approach axis, it is cold to go out the offline heap in ACC water cooling area after number of oscillations to be done.The advantage is that the water cooling ability of ACC equipment can be given full play to, by swinging the length that can extend water cooling area in water cooling roller channel, it can be achieved that TMCP state bridge steel 120mm specification water-cooling process requirement below at present.
Description
Technical field
The invention belongs to bridge steel production technical field, in particular to a kind of swing cooling technique produces think gauge bridge steel
Method.More particularly to a kind of method for swinging cooling technique production 80~120mm think gauge TMCP state bridge steel, it is specific to utilize
Steel plate is swung in ACC cooled region to increase the water cooling time, realizes the production method of think gauge TMCP state steel plate.
Background technique
Currently, both at home and abroad in newly-built large-scale over strait, cross a river non-major P.E.subject, this large size iron structure, which leads it, to be held
Power part has higher requirement, shows as think gauge, high intensity, high tenacity and anti-lamellar tearing performance.The steel addressed that need
Plate, the technique of conventionally employed normalizing guarantee that the mechanical property of steel plate meets the specification with higher carbon content and carbon equivalent
It is required that but the design of normalizing ingredient deteriorates its weldability.With the development of steel production technology, TMCP technique production of new generation
Bridge steel there is high-intensitive, high tenacity and good weldability so that TMCP technique gradually replaces normalizing process as bridge
The preferred condition of delivery of joist steel.
When producing think gauge high-strength bridge steel using TMCP technique, desired organization type is bainite, to protect
Demonstrate,prove the intensity and toughness of steel plate.When the steel plate compared with think gauge carries out water cooling, cold temperature eventually need to be cooled to according to certain cooling velocity
For degree to obtain ideal organization type, this requires its water cooling equipments to have the ability of water cooling more lasting.It realizes lasting
Its water cooling equipment of water cooling function has enough length, is transformed upgrading to increase water cooling section length, at present to existing weaponry and equipment
Also only have Shoudu Iron and Steel Co and Anshan iron and steel plant is transformed ACC equipment and joined UFC, on cut deal enterprise rolling line built for majority all not
Water cooling equipment is transformed.Therefore, how using to realize that TMCP technique produces thick with existing water cooling equipment is maximumlly played
Specification steel plate has biggish realistic meaning.
Summary of the invention
The purpose of the present invention is to provide a kind of methods of swing cooling technique production think gauge bridge steel, solve steel mill
Existing weaponry and equipment produces the hypodynamic problem of 80~120mm think gauge TMCP state bridge water cold energy.It is sufficiently sent out in such a way that ACC puts steel
Water cooling equipment ability is waved, realizes the production of TMCP technique think gauge bridge steel.
A method of it swinging cooling technique and produces think gauge bridge steel, to the steel using the rolling of two stages controlled rolling process
Plate realizes swing of the steel plate in ACC water cooling region using the positive and negative rotation of water cooling area roller-way, to provide longer water cooling section length
To realize the purpose of lasting water cooling.Specific step and parameter is as follows:
1, collector flow is set, opens collector quantity and sets number of oscillations in ACC:
(1) ACC collector flow is configured according to water cooling speed, and for 80~120mm steel plate, its collector flow set is
The maximum value that equipment allows, the present invention relates to the pole pipe flow set of ACC equipment, upper header flow is 600L/m2* min, next part
Pipe flow is 1800L/m2*min；
(2) ACC collector quantity is at least are as follows: the ratio+2 of steel plate length and single group header length, so that there are certain pendulum
Dynamic distance；
(3) wherein number of oscillations in ACC, principle are foundation conservation of energy principle, are cooled down in steel plate temperature drop heat and ACC
It is equal that water takes away heat, is 760 ± 20 DEG C for opening cold temperature in conjunction with field condition, final cooling temperature be 380 ± 20 DEG C 80~
The bridge steel of 120mm, 80≤steel plate thickness≤100mm pendulum steel number are 3 times, 100 < steel plate thickness≤120mm pendulum steel
Number is 5 times；
2, it before entering ACC water cooling area to water cooling steel plate, is switched to manual mode and inputs collector flow, set roller table speed
0.5~1m/s；
3, after entering ACC water cooling area with steel plate, collector is successively opened along steel plate approach axis, visual surveillance area waits for steel plate
After position reaches the front end collector opened, roller-way is inverted, it is again that roller-way is anti-after plate tail position reaches caudal end collector
Turn；It is cold to go out the offline heap in ACC water cooling area after number of oscillations to be done.
The present invention has the advantages that
1, it compares with the non-swing cooling technique of tradition, the water cooling ability of ACC equipment can be given full play to, by water cooling
The length that can extend water cooling area is swung in roller-way, it can be achieved that TMCP state bridge steel 120mm specification water-cooling process below is wanted at present
It asks；
2, it compares with the non-time cooling technique that swings of tradition, the surface ACC temperature out can be reduced using cooling technique is swung in ACC
The difference for spending and returning red rear surface temperature realizes the accurate control of final cooling temperature；
3, it is led under the non-swing cooling technique of tradition to guarantee that final cooling temperature (red temperature) often applies strong water cooling to slab
Nonuniform organization on its section of slab is caused, can realize prolonged lasting cooling using cooling technique is swung in ACC, so that
Its thickness x cross sectional even tissue, to improve the performance uniformity on thickness x cross sectional.
Detailed description of the invention
Fig. 1 is that 115mm370MPa grades of bridge steels put steel type of cooling lower steel plate metallographic structure in ACC.
Fig. 2 is that 120mm345MPa grades of bridge steels put steel type of cooling lower steel plate metallographic structure in ACC.
Specific embodiment
Embodiment 1
115mm370MPa grades of bridge steels in water cooling using type of cooling progress is swung in ACC, specifically explain by production method
It states as follows.The steel grade is designed using low-carbon Nb, V, Ti microalloying ingredient, is through molten iron processing, converter, LF refining, continuous casting
400mm continuous casting billet.After the sufficiently heating of 1200 DEG C of heated furnace, using two-phase control rolling technique, rough rolling step uses the big pressure of low speed
Under principle, be 200mm to temperature thickness, finish rolling start rolling temperature is 830 DEG C, is rolled to after target thickness that enter to carry out pendulum steel in ACC cold
But.Opening cold temperature is 780 DEG C, roller table speed 0.5m/s, opens 10 groups of collectors altogether, and upper header flow is 600 (L/m2*min), under
Collector flow is 1800 (L/m2*min), and ACC water cooling area is gone out after round-trip 2.5 total 80s, and surface final cooling temperature is 370 DEG C, is surveyed
Its fixed red temperature is 490 DEG C, by offline heap cold 36 hours or more rapidly after cold rectify, and the 400 DEG C of destressings of thermally treated furnace
After tempering, metallographic detection is as shown in Figure 1, as shown in table 1 through detection bridge Steel Properties.
Comparative example 1
115mm370MPa grades of bridge steels are carried out in water cooling using the UFC+ACC linkage type of cooling, and production method is specific
It is described below.The steel grade is designed using low-carbon Nb, V, Ti microalloying ingredient, is through molten iron processing, converter, LF refining, continuous casting
400mm continuous casting billet.After the sufficiently heating of 1200 DEG C of heated furnace, using two-phase control rolling technique, rough rolling step uses the big pressure of low speed
Under principle, be 200mm to temperature thickness, finish rolling start rolling temperature is 830 DEG C, is rolled to after target thickness and enters UFC+ACC linkage cooling.
Opening cold temperature is 778 DEG C, and roller table speed 0.5m/s, UFC open 9 groups of collectors altogether, and upper header flow is 220 (L/m2*min),
Lower collector pipe flow is 418 (L/m2*min), and ACC opens 15 groups of collectors altogether, and upper header flow is 600 (L/m2*min), lower collector pipe stream
Amount is 1680 (L/m2*min), measures 380 DEG C of surface temperature behind ACC water cooling area out, and red temperature is 530 DEG C, after cold rectify
Rapid offline heap cold 36 hours or more, and after the 400 DEG C of destressing tempering of thermally treated furnace, through detecting bridge steel mechanical property such as table
Shown in 1.
The mechanical property of 1 115mm370MPa grades of bridge steel steel plate of table
Embodiment 2
120mm345MPa grades of bridge steels in water cooling using type of cooling progress is swung in ACC, specifically explain by production method
It states as follows.The steel grade chemical component is designed using low-carbon NbTi microalloying, through molten iron processing, converter smelting, LF refining, company
Casting, by the cold 36h or more of the offline heap of continuous casting billet.After the sufficiently heating of 1170 DEG C of heated furnace, using two-phase control rolling technique, roughing rank
The principle of the big pressure of Duan Caiyong low speed is 160mm to temperature thickness, and finish rolling start rolling temperature is 815 DEG C, is entered after being rolled to target thickness
It is cooling that pendulum steel is carried out in ACC.Opening cold temperature is 750 DEG C, roller table speed 0.5m/s, opens 12 groups of collectors altogether, upper header flow is
600 (L/m2*min), lower collector pipe flow are 1800 (L/m2*min), ACC water cooling area are gone out after round-trip 2.5 total 96s, eventually cold temperature
Degree is 337 DEG C, and red temperature is 431 DEG C, by offline heap cold 36 hours or more rapidly after cold rectify, and 400 DEG C of thermally treated furnace
After destressing tempering, detected by metallographic as shown in Fig. 2, as shown in table 2 through detection mechanical property.
2 120mmQ345qD of table puts the mechanical property of steel type of cooling lower steel plate in ACC
Claims (1)
1. a kind of method for swinging cooling technique production think gauge bridge steel, which is characterized in that specific step and parameter is as follows:
1) collector flow is set, opens collector quantity and sets number of oscillations in ACC:
1. ACC collector flow is configured according to water cooling speed, permit for its collector flow set of 80~120mm steel plate for equipment
Perhaps maximum value, the upper header flow of ACC equipment are 600L/m2* min, lower collector pipe flow are 1800L/m2*min；
2. ACC collector quantity is at least are as follows: the ratio+2 of steel plate length and single group header length, so that there are swinging distances；
3. wherein number of oscillations in ACC, principle is the cooling water band in steel plate temperature drop heat and ACC according to conservation of energy principle
It is equal to walk heat, is 760 ± 20 DEG C for opening cold temperature, the bridge steel for 80~120mm that final cooling temperature is 380 ± 20 DEG C, 80
≤ steel plate thickness≤100mm pendulum steel number is 3 times, and 100 < steel plate thickness≤120mm pendulum steel number is 5 times；
2) it before entering ACC water cooling area to water cooling steel plate, is switched to manual mode and inputs collector flow, setting roller table speed 0.5~
1m/s；
3) after entering ACC water cooling area with steel plate, collector is successively opened along steel plate approach axis, visual surveillance area waits for steel plate position
After reaching the front end collector opened, roller-way is inverted, after plate tail position reaches caudal end collector, is again inverted roller-way；
It is cold to go out the offline heap in ACC water cooling area after number of oscillations to be done.
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| CN201710822881.9A CN107695113B (en) | 2017-09-13 | 2017-09-13 | A method of it swinging cooling technique and produces think gauge bridge steel |
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| CN201710822881.9A CN107695113B (en) | 2017-09-13 | 2017-09-13 | A method of it swinging cooling technique and produces think gauge bridge steel |
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| CN107695113A CN107695113A (en) | 2018-02-16 |
| CN107695113B true CN107695113B (en) | 2019-02-22 |
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Citations (5)
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|---|---|---|---|---|
| JP2008100256A (en) * | 2006-10-19 | 2008-05-01 | Jfe Steel Kk | Equipment and method for cooling steel sheet |
| CN101642780A (en) * | 2009-06-05 | 2010-02-10 | 中冶赛迪工程技术股份有限公司 | Intermediate blank cooling system and cooling control technology |
| CN102294366A (en) * | 2010-06-23 | 2011-12-28 | 宝山钢铁股份有限公司 | Dynamic control method for online cooling control system of medium-thickness steel plate |
| CN102513384A (en) * | 2011-12-09 | 2012-06-27 | 东北大学 | Method for cooling intermediate billet of medium-thickness plate by using equipment for cooling after rolling |
| CN103752626A (en) * | 2013-12-30 | 2014-04-30 | 秦皇岛首秦金属材料有限公司 | Producing method for improving steel plate surface quality by utilizing ACC semi-automatic water cooling |
-
2017
- 2017-09-13 CN CN201710822881.9A patent/CN107695113B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008100256A (en) * | 2006-10-19 | 2008-05-01 | Jfe Steel Kk | Equipment and method for cooling steel sheet |
| CN101642780A (en) * | 2009-06-05 | 2010-02-10 | 中冶赛迪工程技术股份有限公司 | Intermediate blank cooling system and cooling control technology |
| CN102294366A (en) * | 2010-06-23 | 2011-12-28 | 宝山钢铁股份有限公司 | Dynamic control method for online cooling control system of medium-thickness steel plate |
| CN102513384A (en) * | 2011-12-09 | 2012-06-27 | 东北大学 | Method for cooling intermediate billet of medium-thickness plate by using equipment for cooling after rolling |
| CN103752626A (en) * | 2013-12-30 | 2014-04-30 | 秦皇岛首秦金属材料有限公司 | Producing method for improving steel plate surface quality by utilizing ACC semi-automatic water cooling |
Non-Patent Citations (1)
| Title |
|---|
| 中厚板轧后先进冷却工艺技术的研究与应用;张田;《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》;20170315(第03期);第B022-830页 |
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