CN107537856B - A kind of production technology of high strength flat-bulb steel - Google Patents
A kind of production technology of high strength flat-bulb steel Download PDFInfo
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- CN107537856B CN107537856B CN201711047709.7A CN201711047709A CN107537856B CN 107537856 B CN107537856 B CN 107537856B CN 201711047709 A CN201711047709 A CN 201711047709A CN 107537856 B CN107537856 B CN 107537856B
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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
- B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/12—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 structural sections, i.e. work of special cross-section, e.g. angle steel in a continuous process, i.e. without reversing stands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
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Abstract
The invention discloses a kind of production technologies of high strength flat-bulb steel, belong to metal rolled field, and production craft step includes: (1) BD1 rolling；(2) BD2 is rolled；(3) DRDF is rolled；(4) initial material is cooling；(5) initial material cooled down carries out subdivision, aligning.Have steel embryo, roll versatility good compared with prior art；Big, the high-quality feature of finished product specification limit.
Description
Technical field
The present invention is a kind of application for a patent for invention " production technology of flat-bulb steel " (application number: point 2015109033823)
Case application is related to a kind of steel manufacturing process, especially a kind of rolling mill practice suitable for flat-bulb steel.
Background technique
Flat-bulb steel is one kind of special sections, is mainly used for shipbuilding and bridging, but at full speed with shipbuilding industry in recent years
Development, it is most important one kind in shipbuilding section that flat-bulb steel, which is increasingly becoming the special title of Flat-bulb Steel for Ship Use, mainly as adding for the deck of boat
Strengthening tendons use, and are equivalent to " rib cage " of people.Flat-bulb steel is made of flat web and spherical bulb, is asymmetric fashioned iron,
List branch rolling is commonly used under the prior art, i.e., according to mill load and lengthening coefficient, is directly depressed.Its specific production technology
Step is steel billet → heating → one-strand roller → aligning.Due to single branch operation of rolling deform it is asymmetric, web and bulb ratio compared with
Greatly, bending is easily caused after cold bed is cooling, to influence whether product quality.And prior art pair rolling causes to width side
To unrestricted spread is carried out, rolled piece extends greatly, spreads small.
It is a kind of right application No. is being disclosed in the patent of invention of 200610134469.X " a kind of production technology of flat-bulb steel "
The production technology for claiming rolling, the steps include: steel billet → heating → symmetry rolling → straightening processing → subdivision, each passage pass of milling train
It is made of two symmetry equivalent flat-bulb steel passes.Deformation in the single branch operation of rolling of the process improving is asymmetric, but still deposits
In following defect: 1. needing the special passes such as special grooving of roll and finished hole, leader pass, cannot use normal
Steel embryo, roll are advised, causes special computer for special use, deficiency in economic performance, and it is of single specification；2. technical requirements are disposably pressed into, by milling train
Mill load and lengthening coefficient limitation, so that the rolled piece of big specification can not be produced, still need to single branch for the flat-bulb steel of super large-scale
Rolling；3. two flat-bulb steel intermediate connections thickness of symmetry rolling are larger, difficulty, therefore the case are brought to next procedure subdivision
What is used earnestly divides, and earnestly divides and have an impact for cross-section structure, and product end quality is defective；4. flat for the ball of every kind of specification
Steel needs a kind of steel billet of individually designed specification, and it is public to can not achieve blank.
Summary of the invention
Technical assignment of the invention is to provide a kind of production work of high strength flat-bulb steel for the above the deficiencies in the prior art
Skill can produce the flat-bulb steel of the high quality of big specification.
The present invention the technical solution to solve the technical problem is that: a kind of production technology of high strength flat-bulb steel, feature exist
In production craft step includes:
(1) first blooming mill rolls: spreading rectangular bloom for flat blank through first blooming mill；It spreads process are as follows:
Twice groove is extruded first on rectangular bloom, then the boss between twice groove is flattened；
(2) second frame blooming mills rolling: through the second frame blooming mill by the resulting flat blank of first blooming mill in step (1)
Symmetrical material type is rolled into, the material type includes the end of both ends thickness and the plate portion of intermediate thin；Waveform is presented in plate portion；BD2 rolls
" waveform " material type temperature is to immerse in hardening media material type between 940 DEG C~1010 DEG C and be cooled to 360 DEG C~410 by force after system
DEG C, and with the temperature 30 minutes, 680 DEG C~700 DEG C are then heated to, keeps the temperature 30 minutes, enters two frame tandems later
Two-roller mill rolls (DRDF) process, two frame tandem two-roller mills rolling (DRDF) temperature be not higher than 900 DEG C；
(3) two frame tandem two-roller mills rolling: by two frame tandem two-roller mills that the second frame blooming mill is resulting
Material type rolls into initial material, and the initial material includes the flat-bulb steel that two symmetrical webs are connected, the symmetrical flat-bulb steel abdomen of two of them
There is a recess in plate junction, and recess thickness is less than the thickness at flat-bulb steel web, and angle is small on two symmetrical flat-bulb steel webs
In 180 °；
(4) initial material enters cold bed strong wind cooling；
(5) initial material cooled down carries out subdivision, aligning.
Above-mentioned first blooming mill rolling includes 7 passages: the 1st passage extrudes two in rectangular bloom upper and lower surface respectively
Road groove；2nd passage flattens the boss between the twice groove；3rd passage, by the twice groove two sides
Boss flattens；4th passage extrudes one of groove in the centre of rectangular bloom upper and lower surface respectively；5th passage, by the groove
The pressure of two sides boss；6th passage, is rotated by 90 °, and carries out edging；7th passage, is rotated by 90 °, and spreads again.
The waveform that above-mentioned plate portion is presented is discontinuous sine curve, is made of four wave crests and three troughs: described
Four wave crests include two big wave crest and two small wave crests, described two big wave crest is located at plate portion midpoint two sides, and two are greatly
Small trough is formed between wave crest, the lowest point of the small trough is plate portion midpoint；Two small echo peaks are located at end and plate portion
Joint is big trough between the ipsilateral small wave crest and big wave crest.
The initial material of above-mentioned two frame tandem two-roller mills rolling, two flat-bulb steel web junctions are with a thickness of 3mm, every side
Flat-bulb steel web and horizontal line angle are 3 °.
In above-mentioned steps (5), subdivision aligning is carried out using aligning Unit erriger.
Above-mentioned aligning Unit erriger includes straightener and the disc type cutting equipment in front of it.
Compared with prior art, the present invention have it is following prominent the utility model has the advantages that
1, steel embryo, roll versatility are good；
2, same equipment can produce the flat-bulb steel of bigger specification；
3, subdivision is easy, the preferable surface quality of split surface, and realizes that on-line continuous is turned into industry, high-efficient；
4, absolute spread is than that can have more 30% using conventional spreading；
5, flat-bulb steel has good elasticity.
Detailed description of the invention
Fig. 1 is the BD1 operation of rolling schematic diagram of the embodiment of the present invention 1.
Fig. 2 is the embodiment of the present invention 1 through BD2, DRDFOperation of rolling schematic diagram.
Fig. 3 is that BD2 rolling gained of the present invention expects template portion schematic cross-section.
Fig. 4 is the cold bed mill construction schematic diagram that the embodiment of the present invention 2 uses.
Specific embodiment
The present invention is further described with specific embodiment with reference to the accompanying drawings of the specification.
Embodiment 1, the present embodiment production technology are as follows: rectangular bloom → heating → BD1 rolling → BD2 rolling → DRDFRolling →
Cold bed natural cooling → cold cut divides straightening processing.
Specific step is as follows:
(1) as shown in Figure 1, spreading rectangular bloom for flat blank through first blooming mill (BD1), process of spreading is first
Twice groove is extruded on rectangular bloom, then the boss between twice groove is flattened.It is rolled by subregion, reduces rolled piece and extend,
Increase is spreaded, and such absolute spread can make rectangle than that can have more 30% using conventional spreading, while lesser power can be used
Base sufficiently spreads, and is suitble to spread the rectangular bloom of big specification.
BD1 rolling specifically includes 7 passages: the 1st passage, extrudes twice groove respectively in rectangular bloom upper and lower surface；2nd
It is secondary, the boss between the twice groove is flattened；3rd passage flattens the boss of the twice groove two sides；4th
Passage extrudes one of groove in the centre of rectangular bloom upper and lower surface respectively；5th passage depresses the groove two sides boss；
6th passage, is rotated by 90 °, and carries out edging；7th passage, is rotated by 90 °, and spreads again.Absolute spread is than using the wide of routine in this way
Exhibition can have more 30%.
(2) as shown in 1~4 step of Fig. 2, the resulting flat blank of BD1 is rolled into symmetrical material through the second frame blooming mill (BD2)
Type, material type both ends thickness, intermediate thin." bulb " of the end of both ends thickness to form flat-bulb steel, the plate portion of intermediate thin is to shape
At " web " of flat-bulb steel." waveform " is presented in intermediate plate portion, as shown in figure 3, bilateral is presented with midpoint in the waveform
Symmetrically.For the ease of narration, with the upper and lower for narration direction of Fig. 3, in prioritization scheme, " waveform " section is non-
Continuous sine curve is made of four wave crests and three troughs: four wave crests include two big wave crest 2 and two small echos
Peak 1, described two big wave crest 2 are located at plate portion midpoint two sides, form small trough 4, the small trough 4 between two big wave crest 2
The lowest point be plate portion midpoint；The small wave crest 1 of described two is located at end and plate portion joint, the ipsilateral small wave crest 1 and big
It is big trough 3 between wave crest 2, it is poor using radian that the above curve waveform design sense is, so that in DRDFIn the operation of rolling everywhere
It is equal to extend ratio, so as to guarantee that mechanical property is equal flat-bulb steel web everywhere.
(3) as shown in 5~8 steps of Fig. 2, two frame tandem two-roller mill (DRDF) " waveform " material type rolled into initial material, institute
The initial material stated includes the flat-bulb steel that two symmetrical webs are connected, and two of them symmetrical flat-bulb steel web junction has one recessed
It falls into, recess thickness is less than the thickness at flat-bulb steel web, and angle is less than 180 ° on two symmetrical flat-bulb steel webs.What it was recessed
Being formed can be with are as follows: processed among the finished product lower roll groove of this milling train with the boss for being recessed and matching, pass through the boss
Shut out the depressed section of junction, or any hole type design that can be completed its recess and be formed.Ball is flat in prioritization scheme
With a thickness of 3mm, every side flat-bulb steel web and horizontal line angle are 3 ° for steel web junction.Enable flat-bulb steel by sunk structure
It is easier to split, and guarantees split surface quality.
(4) initial material is through cold bed natural cooling.
(5) initial material cooled down carries out subdivision, aligning.The step is mechanical using subdivision, aligning respectively, can also be straight
Tap into subdivision align Unit erriger, the aligning Unit erriger include straightener and its in front of disc type cutting equipment,
Rolled piece opens the junction cutting of two flat-bulb steels during traveling, it can be achieved that the preferable surface quality of split surface, and real
Present line continuous operations, it is high-efficient.
The technology of the present invention makes rectangular bloom local pressure by the way of first indentation slot again belling platform and waveform rolling, compared with
Small pressure can be such that rectangular bloom sufficiently spreads, i.e., the bigger rectangular bloom of specification can be spreaded under same pressure；Using " wave
The rolling mode of shape wave " make rectangular bloom before being fully deployed have lesser size, so as to so that certain specification blooming mill
Larger sized flat-bulb steel is produced, to realize the flat-bulb steel that can produce big specification under conditions of being changed without machine.
It is poor using radian that described " waveform " section takes discontinuous sine curve curve waveform design sense to be, so that in DRDF
It is equal to extend ratio in the operation of rolling everywhere, so as to guarantee that mechanical property is equal flat-bulb steel web everywhere.
Embodiment 2, the present embodiment production technology are as follows: rectangular bloom → heating → BD1 rolling → BD2 rolling → DRDFRolling →
Cold bed strong wind cooling → cold cut divides straightening processing.In addition to " cold bed strong wind cooling ", other techniques are as in the first embodiment, in the present embodiment
In be not repeated.
Specific cold bed strong wind cooling process is DRDFGained initial material enters cold bed workshop 12 and is cooled down in rolling, described
Cold bed workshop 12 as shown in figure 4, including cold bed 6, foundation pit, ventilator 14 and strong air-cooler 5, the cold bed entrance of cold bed workshop 12
11 and cold bed outlet 7 at be respectively equipped with entrance foundation pit 8 and outlet foundation pit 9, entrance foundation pit 8 and outlet foundation pit 9 stretch out cold bed factory
Outside room 12,8 length of entrance foundation pit, depth are respectively smaller than outlet foundation pit 9.Entrance foundation pit 8 and outlet foundation pit 9 and cold bed 6
Lower section foundation pit 13 communicates, and ladder-like, 9 level of lower rank and outlet foundation pit, upper rank and 8 level of entrance foundation pit is presented in foundation pit 13, and cold
There are multiple pillars in the lower foundation pit 13 of bed 6, blend stop of laterally turning back is installed in the foundation pit 13 of one third part after cold bed 6.It is described
The top of cold bed workshop 12 is equipped with ventilator 14, and the lower section of cold bed 6 is equipped with strong air-cooler 5, and strong air-cooler 5 is mounted on cold bed 6
In after one third intersection, strong 5 air-out direction of air-cooler is towards into steel direction, in order to the cold wind for generating strong air-cooler 5
The top portion ventilation device 14 of the cold bed workshop 12 is blowed to, and is guided with this at air flow direction ventilator 14 in entire 6th area of cold bed.
Flat-bulb steel initial material in this step is directly down to 80 DEG C by 950 DEG C in cooling procedure, can at the uniform velocity advance, without cold stage by stage
But.Using both ends design of foundation pit and ladder air cooling technology, air enters cold bed 6: entrance by the foundation pit at the both ends of cold bed workshop 12
8 air of foundation pit enters naturally carries out basis cooling, and cold air heat absorption rises, excluded by 6 top ventilator 14 of cold bed, constantly inhaled
Draw cold wind to enter from foundation pit；Entrance foundation pit 8 compares shallower, and internal to turn back design without pillar and bottom surface, reason is entrance
Locate the temperature highest of steel, air needs to take away rapidly heat, but the section again cannot be excessively strong cold, and initial cooling rate is excessively high
Then Wei Shi body tissue and bainite structure are largely formed, and influence steel product performance.One third passes through strong air-cooler in cold bed 6
5 realize air blast cooling, and the angle between the air outlet and ventilator 14 of strong air-cooler 5 is 15 °~20 °, which comprehensively considers
The ascension of hot-air, it is ensured that high efficiency flow, and repeatedly turned back by pillar and bottom grooves, increase cooling effect, heat
Efficiency is exchanged, the rear that sufficiently exchanges heat is escaped from ventilator 14；The purpose of 13 step-like design of foundation pit lies also in reduction air blast cooling
Air-cooled influence gentle for one third before cold bed 6, reduces Wei Shi body tissue and bainite structure is formed.Three points after cold bed 6
One of air enter from deep, long outlet foundation pit 9, foundation pit posterior transversal is turned back design, for having carried out the steel of cold cooling by force
It is cooled down twice.Using above-mentioned this kind air-cooled air-cooled Compound cooling, (average cooling rate is by common air-cooled for cooling velocity promotion
14.5 DEG C/min of cold bed rises to 22.5 DEG C/min), and under steel cold bed poker temperature difference less than 10 DEG C, to ensure that
While increasing cooling rate, cooling uniformity ensure that, while also solving super large-scale model flat-bulb steel web because cold
The deformation and cooling wave problem and cooling too fast Wei Shi body tissue early period and bainite structure that uneven and self weight generates are big
Amount formed and caused by finished product intensity difference the problem of.
The above-mentioned type of cooling accelerates the cooling velocity of cold bed, at the same also solve super large-scale model flat-bulb steel web because
The deformation and cooling wave problem that inhomogeneous cooling and self weight generate.
Embodiment 3, the present embodiment are to carry out temperature-controlled rolling, production technology on the basis of embodiment 1 are as follows: rectangular bloom → add
Heat → BD1 rolling → BD2 rolling → temperature control processing → DRDFRolling → cooling → cold cut divides straightening processing.Temperature control processing therein
Specifically: " waveform " material type temperature is 940 DEG C~1010 DEG C after BD2 rolling, and then material type cools down through water curtain, be down to temperature
700 DEG C~750 DEG C, and continue to carry out D within this temperature rangeRDFRolling.Its object is to increase flat-bulb steel by elasticity.
Embodiment 4, the present embodiment are to carry out heat treatment process, production technology on the basis of embodiment 1 are as follows: rectangular bloom →
Heating → BD1 rolling → BD2 rolling → heat treatment → DRDFRolling → cooling → cold cut divides straightening processing.Described is heat treated
Journey specifically: " waveform " material type temperature is to immerse material type strong in hardening media between 940 DEG C~1010 DEG C after BD2 rolling
It is cooled to 360 DEG C~410 DEG C, and with the temperature 30 minutes, is then heated to 680 DEG C~700 DEG C, keeps the temperature 30 minutes, later
Into DRDFRolling process, DRDFRolling temperature is not higher than 900 DEG C.Flat-bulb steel further increases its elasticity after Overheating Treatment
Can, it is more suitable for the naval vessel of particular/special requirement, the hull that such as hits vulnerable to floating ice or vulnerable to shell, the warship of torpedo attack,
Instantaneous impact can be sponged by way of flexible deformation, plays buffer function, hull is prevented to be damaged, and avoid the perils of the sea
Generation.
It should be noted that specific embodiment of the invention is to the present invention have been described in detail, for ability
For the technical staff in domain, its various of progress is obviously changed without departing from the spirit and scope of the present invention
Become all within protection scope of the present invention.
Claims (6)
1. a kind of production technology of high strength flat-bulb steel, which is characterized in that production craft step includes:
(1) first blooming mill rolls: spreading rectangular bloom for flat blank through first blooming mill；It spreads process are as follows: first
Twice groove is extruded on rectangular bloom, then the boss between twice groove is flattened；
The rolling of (2) second frame blooming mills: the resulting flat blank of first blooming mill in step (1) is rolled into through the second frame blooming mill
Symmetrical material type, the material type includes the end of both ends thickness and the plate portion of intermediate thin；Waveform is presented in plate portion；Second frame cogging
Machine rolling after " waveform " material type temperature be 940 DEG C~1010 DEG C between, will material type immerse hardening media in be cooled to by force 360 DEG C~
410 DEG C, and with the temperature 30 minutes, 680 DEG C~700 DEG C are then heated to, keeps the temperature 30 minutes, enters two frame tandems later
Formula two-roller mill rolling process, two frame tandem two-roller mill rolling temperatures are not higher than 900 DEG C；
(3) two frame tandem two-roller mills rolling: by two frame tandem two-roller mills the resulting material type of the second frame blooming mill
Initial material is rolled into, the initial material includes the flat-bulb steel that two symmetrical webs are connected, and the symmetrical flat-bulb steel web of two of them connects
There is a recess at the place of connecing, and recess thickness is less than the thickness at flat-bulb steel web, and angle is less than on two symmetrical flat-bulb steel webs
180°；
(4) initial material enters cold bed strong wind cooling；
(5) initial material cooled down carries out subdivision, aligning.
2. a kind of production technology of high strength flat-bulb steel according to claim 1, it is characterised in that: the first is opened
The rolling of base machine includes 7 passages: the 1st passage extrudes twice groove in rectangular bloom upper and lower surface respectively；2nd passage, will be described
Boss between twice groove flattens；3rd passage flattens the boss of the twice groove two sides；4th passage, in rectangle
The centre of base upper and lower surface extrudes one of groove respectively；5th passage depresses one of groove two sides boss；6th
It is secondary, it is rotated by 90 °, carries out edging；7th passage, is rotated by 90 °, and spreads again.
3. a kind of production technology of high strength flat-bulb steel according to claim 1, it is characterised in that: the plate portion is presented
Waveform be discontinuous sine curve, be made of four wave crests and three troughs: four wave crests include two big waves
Peak and two small wave crests, described two big wave crest is located at plate portion midpoint two sides, forms small trough between two big wave crest, described
The lowest point of small trough is plate portion midpoint；Two small echo peaks are located at end and plate portion joint, ipsilateral small wave crest and big
It is big trough between wave crest.
4. a kind of production technology of high strength flat-bulb steel according to claim 1, it is characterised in that: the two frame tandems
The initial material of formula two-roller mill rolling, two flat-bulb steel web junctions are with a thickness of 3mm, every side flat-bulb steel web and horizontal line angle
It is 3 °.
5. a kind of production technology of high strength flat-bulb steel according to claim 1, it is characterised in that: in the step (5),
Subdivision aligning is carried out using aligning Unit erriger.
6. a kind of production technology of high strength flat-bulb steel according to claim 5, it is characterised in that: the aligning joint
Unit includes straightener and the disc type cutting equipment in front of it.
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| CN201711047709.7A CN107537856B (en) | 2015-12-09 | 2015-12-09 | A kind of production technology of high strength flat-bulb steel |
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| CN201510903382.3A CN105478470B (en) | 2015-12-09 | 2015-12-09 | A kind of production technology of flat-bulb steel |
| CN201711047709.7A CN107537856B (en) | 2015-12-09 | 2015-12-09 | A kind of production technology of high strength flat-bulb steel |
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| CN201711047741.5A Active CN107790492B (en) | 2015-12-09 | 2015-12-09 | A kind of production technology of elasticity flat-bulb steel |
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| CN107570547A (en) * | 2017-07-27 | 2018-01-12 | 宿迁南钢金鑫轧钢有限公司 | A kind of Flat-bulb Steel for Ship Use production technology |
| CN108421839B (en) * | 2018-05-28 | 2019-07-05 | 山西太钢不锈钢股份有限公司 | A kind of flat-bulb steel diplopore model extrusion method |
| CN108787742A (en) * | 2018-07-06 | 2018-11-13 | 鞍钢股份有限公司 | Rolling method of flat bulb steel for small and medium sized shipbuilding |
| CN109261714B (en) * | 2018-09-05 | 2020-04-24 | 鞍钢股份有限公司 | Rolling method of symmetrical flat-bulb steel for large shipbuilding |
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| BE450615A (en) * | 1943-05-13 | 1943-06-30 | John Cockerill Sa | |
| JPS5835761B2 (en) * | 1978-03-29 | 1983-08-04 | 新日本製鐵株式会社 | Rolling method of section steel |
| JPS5677003A (en) * | 1979-11-30 | 1981-06-25 | Nippon Steel Corp | Universal rolling method for straight sheet pile and similar steel shape |
| JPS58141801A (en) * | 1982-02-19 | 1983-08-23 | Nippon Steel Corp | Production of shape steel having high toughness as rolled |
| JPS58141801U (en) * | 1982-03-20 | 1983-09-24 | 株式会社ニシムラジグ | Squareness and angle measuring instruments |
| DD213142A1 (en) * | 1983-01-21 | 1984-09-05 | Thaelmann Schwermaschbau Veb | DEVICE FOR THE CONTROLLED AIR COOLING OF ROLLING GOODS |
| DD243174A3 (en) * | 1985-05-06 | 1987-02-25 | Thaelmann Schwermaschbau Veb | EQUIPMENT FOR ADDITIONAL BREATHING OF KLEHLBETTEN |
| CN101190442A (en) * | 2006-11-30 | 2008-06-04 | 鞍钢股份有限公司 | Production process of flat-bulb steel |
| CN101214599B (en) * | 2008-01-14 | 2010-11-03 | 扬州诚德钢管有限公司 | Bulb steel production technique |
| CN101229564B (en) * | 2008-02-26 | 2011-06-22 | 重庆钢铁(集团)有限责任公司 | Manufacturing method of increasing high strength flat-bulb steel low temperature impact properties percent of pass |
| CN201659138U (en) * | 2010-01-26 | 2010-12-01 | 重庆钢铁(集团)有限责任公司 | Flat-bulb steel rolling device |
| CN201659139U (en) * | 2010-01-26 | 2010-12-01 | 重庆钢铁(集团)有限责任公司 | Flat-bulb steel breaking-down roll device |
| CN102688908B (en) * | 2012-06-10 | 2014-07-23 | 吉林大学 | Designing method for cross wedge rolling mould of conical surface stepped shaft part |
| CN204769875U (en) * | 2015-06-05 | 2015-11-18 | 宿迁南钢金鑫轧钢有限公司 | Closed pass structure of flat -bulb steel web straight flange |
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| CN107790492B (en) | 2019-02-15 |
| CN105478470B (en) | 2017-12-08 |
| CN105478470A (en) | 2016-04-13 |
| CN107537856A (en) | 2018-01-05 |
| CN107790492A (en) | 2018-03-13 |
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Denomination of invention: Production process of high strength spherical flat steel Effective date of registration: 20211222 Granted publication date: 20190503 Pledgee: Rizhao Bank Co., Ltd Pledgor: RIZHAO STEEL HOLDING GROUP Co.,Ltd. Registration number: Y2021980015819 |
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