CN107617640A - A kind of high-strength marine shaped steel is heat-treated rolling mill practice - Google Patents
A kind of high-strength marine shaped steel is heat-treated rolling mill practice Download PDFInfo
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- CN107617640A CN107617640A CN201710769171.4A CN201710769171A CN107617640A CN 107617640 A CN107617640 A CN 107617640A CN 201710769171 A CN201710769171 A CN 201710769171A CN 107617640 A CN107617640 A CN 107617640A
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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
Abstract
The invention discloses a kind of high-strength marine shaped steel to be heat-treated rolling mill practice, belongs to field of steel material production, production craft step includes：(1) first blooming mill (BD1) rolls；It is heat-treated after the rolling of (2) second frame blooming mills (BD2)；(3) two frame tandem two-roller mills (DRDF) roll；(4) the air-cooled Compound cooling of air cooling；(5) the first material cooled down carries out subdivision, aligning.Wherein：The cold bed factory building used in the step (4) includes cold bed, foundation ditch, ventilator and strong air-cooler.Compared with prior art, subdivision is easy, and cools fast, flat-bulb steel surface cooling uniformly, and flexural deformation is small, and finished product intensity is big.
Description
Technical field
The present invention is patent application《A kind of high-strength marine shaped steel preparation technology》(application number：2015109033607)
Divisional application, it is related to a kind of steel manufacturing process, particularly a kind of high-strength marine shaped steel preparation technology.
Background technology
The rapid development of shipbuilding industry in recent years, flat-bulb steel are increasingly becoming most important one kind in shipbuilding section, main to make
Used for the reinforcement of the deck of boat, equivalent to " rib " of people.Flat-bulb steel is made up of flat web and spherical bulb, is not
Symmetrical shaped steel, single branch rolling is commonly used under prior art, i.e., according to mill load and lengthening coefficient, is directly depressed.Its is specific
Production craft step be steel billet → heating → one-strand roller → aligning.Due to single branch operation of rolling deform it is asymmetric, web with
Bulb large percentage, bending is easily caused after cold bed cooling, so as to influence whether product quality.And prior art pair rolling is led
Cause to carry out unrestricted spread to width, rolled piece extension is big, spreads small.Application No. 200610134469.X patent of invention
《A kind of production technology of flat-bulb steel》In disclose a kind of production technology of symmetry rolling, its step is：Steel billet → heating → right
Claim rolling → straightening processing → subdivision, each passage pass of milling train is made up of two symmetry equivalent flat-bulb steel passes.The technique changes
The deformation being apt in single branch operation of rolling is asymmetric, but still suffers from following defect：1. special grooving of roll is needed, and
The special pass such as finished hole, leader pass, it is impossible to using conventional steel embryo, roll, cause special computer for special use, deficiency in economic performance, and advise
Lattice are single；2. technical requirements are disposably pressed into, limited by milling train mill load and lengthening coefficient, so as to which big specification can not be produced
Rolled piece, still need to single branch for the flat-bulb steel of super large-scale and roll；3. two flat-bulb steel intermediate connections thickness of symmetry rolling
It is larger, difficulty, therefore fervent point that the case uses are brought to next procedure subdivision, and earnestly divide and have an impact for cross-section structure,
Product end quality is defective；4. need a kind of individually designed steel billet of specification for the flat-bulb steel of every kind of specification, it is impossible to realize base
Expect public.
In addition, another key element for influenceing flat-bulb steel production is cooling, the final temperature of hot rolling is generally 800~1000
DEG C, need to carry out being cooled to 80 DEG C or so afterwards, different according to cooling medium, cooling is divided into air cooling, oil cooling, air-cooled, water cooling etc..
The key control point of cooling technique is cooling velocity, and above-mentioned cooling velocity water cooling is most fast, and air cooling is most slow, and oil cooling, air-cooled between two
Between person.At present the type of cooling of flat-bulb steel have cold bed heap move air cooling (《Improve high strength flat-bulb steel low temperature impact properties percent of pass
Production method》Application number：200810069394.0), water cooling (《Large-size high-strength D40 hot rolling flat-bulb steels peculiar to vessel and production work
Skill》Application number：201110449456.2), compressed air it is air-cooled (《Special-shaped steel prevents from cooling down bending apparatus and process》Shen
Please number：201310028435.2).Previously experiment shows：The quantity increase of Wei Shi bodies tissue and granular bainite can cause in steel
High-strength flat-bulb steel low temperature impact properties are unqualified, and the formation of Wei Shi bodies tissue and bainite structure and cooling velocity and cooling are not
It is balanced relevant, therefore this kind of defect is avoided, part of production, which abandons, efficiently cools down because of inhomogeneous cooling the wind of Bending Deformation
Cold, water-cooling pattern, air cooling is moved using cold bed heap.But due to when flat-bulb steel needs to be cooled to certain temperature in process of production
Straightening processing can be carried out, cooling not in time, then can cause to be forced to slow down its speed of production, limit the production efficiency of product.
The content of the invention
The technical assignment of the present invention is to be directed to above the deficiencies in the prior art, there is provided a kind of high-strength marine shaped steel prepares work
Skill, production technology can be simplified, ensure finished product quality, and production efficiency can be improved.
1. the technical scheme that the present invention solves its technical problem is：A kind of high-strength marine shaped steel preparation technology, its feature
It is：Production craft step includes：
(1) first blooming mill (BD1) rolls：Rectangular bloom is spreaded as flat blank through BD1；
(2) second frame blooming mills (BD2) roll：The flat blank obtained by BD1 in step (1) is bundled into symmetrical material type, institute through BD2
The material type stated includes the plate portion of the thick end in both ends and intermediate thin；Waveform is presented in plate portion；" waveform " material type temperature after BD2 rollings
Spend between 940 DEG C~1010 DEG C, material type to be immersed in hardening media and is cooled to 360 DEG C~410 DEG C by force, and with the temperature 30
Minute, 680 DEG C~700 DEG C are then heated to, is incubated 30 minutes；
(3) two frame tandem two-roller mill (DRDF) rolling：Pass through DRDFMaterial type obtained by BD2 is rolled into just material, described first material
There are a depression, recess in the flat-bulb steel being connected including two symmetrical webs, the symmetrical flat-bulb steel web junction of two of which
Thickness is less than the thickness at flat-bulb steel web, and angle is less than 180 ° on two symmetrical flat-bulb steel webs；
(4) the air-cooled Compound cooling of air cooling；By gained in step (3), just material is cooled down into cold bed factory building；
(5) the first material cooled down carries out subdivision, aligning.
The cold bed factory building used in the step (4) includes cold bed, foundation ditch, ventilator and strong air-cooler, cold bed factory building
Cold bed entrance and cold bed exit are respectively equipped with entrance foundation ditch and outlet foundation ditch, and entrance foundation ditch and outlet foundation ditch stretch out cold bed factory
Outside room, described entrance foundation ditch length, depth are respectively smaller than outlet foundation ditch；Entrance foundation ditch and outlet foundation ditch and foundation ditch below cold bed
Communicate, foundation ditch presents stepped, and lower rank and outlet foundation ditch are horizontal, and upper rank is horizontal with entrance foundation ditch, and has under cold bed in foundation ditch more
Individual pillar, three after cold bed/foundation ditch of a part in install and laterally turn back blend stop；The top of the cold bed factory building is provided with logical
Wind device, is provided with strong air-cooler below cold bed, strong air-cooler be arranged in cold bed after at 1/3rd, strong air-cooler air-out side
Enter steel direction to direction.
Compared with prior art, the present invention has beneficial effect following prominent：
1st, steel embryo, roll versatility are good, and absolute spread using conventional spreading than that can have more 30%；And can be with using same equipment
The flat-bulb steel of the bigger specification of production；
2nd, finished product flat-bulb steel has good elasticity, and subdivision is easy, the preferable surface quality of split surface, and realizes and connect online
It is continuous to be turned into industry, efficiency high；
3rd, by forcing control cold, rate of temperature fall is lifted, hot rolling is reduced to the time loss between correction, improves steel production effect
Rate, mass rapid degree production yields demand can be met；
4th, cold bed factory building realizes the air-cooled Compound cooling of air cooling using ladder air cooling technology, that is, ensure that cooling velocity, again will not shadow
It is balanced to ring cooling, the cooling of flat-bulb steel surface is uniform, and flexural deformation is small, and finished product intensity is big.
Brief description of the drawings
Fig. 1 is the BD1 operation of rolling schematic diagrames of present invention process.
Fig. 2 is BD2, D of present invention processRDFOperation of rolling schematic diagram.
Fig. 3 is the structural representation that present invention process rolls into symmetrical material type through BD2.
Fig. 4 is present invention process cold bed mill construction schematic diagram.
Fig. 5 is present invention process cold bed factory building prioritization scheme structural representation.
Fig. 6 is the structural representation that comb part is condensed in present invention process cold bed factory building prioritization scheme.
Embodiment
With reference to specification drawings and specific embodiments, the present invention is further described.
The present embodiment production technology comprises the following steps that：
(1) first blooming mill (BD1) rolls：After rectangular bloom heating, rectangular bloom is spreaded as flat blank through BD1, it was spreaded
Journey flattens to extrude groove on slab first, then the boss beside groove.Rolled by subregion, reduce rolled piece extension, increase
Widen exhibition, such absolute spread can use less power to fill slab than that can have more 30% using conventional spreading
Divide and spread, be adapted to the slab for spreading big specification.As shown in figure 1, the present embodiment BD1 rollings specifically include 7 passages：1st passage,
Twice groove is extruded respectively in slab upper and lower surface；2nd passage, the boss between described twice groove is flattened；3rd
It is secondary, the boss of described twice groove both sides is flattened；4th passage, extruded respectively in the centre of slab upper and lower surface recessed together
Groove；5th passage, by described groove both sides boss pressure；6th passage, is rotated by 90 °, and carries out edging；7th passage, rotation 90
Degree, is spreaded again.So absolute spread using conventional spreading than that can have more 30%.In addition, other can be by BD1 by square
Shape base spreads can also use for the mode and hole type design of flat blank.
(2) second frame blooming mills (BD2) roll：As shown in the 1~4 of Fig. 2, the flat blank obtained by step 1 is rolled into through BD2
Symmetrical material type, the material type both ends are thick, intermediate thin.The thick end in both ends is forming " bulb " of flat-bulb steel, the plate of intermediate thin
Portion is forming " web " of flat-bulb steel." waveform " is presented in middle plate portion, as shown in figure 3, described waveform is in midpoint
Existing bilateral is symmetrical.For the ease of narration, with the upper and lower for narration direction of Fig. 3, in prioritization scheme, described " waveform " is
Discontinuous sine curve, it is made up of four crests and three troughs：Four described crests include two big crest 22 and two
Small crest 21, described two big crest 22 is located at plate portion midpoint both sides, small trough 24 is formed between two big crest 22, described
The lowest point of small trough 24 is plate portion midpoint；Described two small crest 21 is located at end and plate portion joint, the homonymy it is small
It is big trough 23 between crest 21 and big crest 22, above curve waveform design sense is poor using radian so that in DRDFRoll
It is equal to extend ratio during system everywhere, mechanical property is equal everywhere so as to ensure flat-bulb steel web.
(3) two frame tandem two-roller mill (DRDF) rolling：As shown in the 5~8 of Fig. 2, through DRDF" waveform " material type is rolled
Into first material, described first material includes the flat-bulb steel that two symmetrical webs are connected, the symmetrical flat-bulb steel web connection of two of which
There is a depression at place, and 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.
It is recessed formation can be：The boss to match with the depression is processed among the finished product lower roll groove of this milling train, is led to
Cross the sunk part that the boss shuts out junction, or any hole type design that can be completed its depression and be formed.Optimization side
Flat-bulb steel intermediate connections thickness is 3mm in case, and every flat-bulb steel web and horizontal line angle are 3 °.Ball is made by sunk structure
Band steel can be easier to split, and ensure split surface quality.
(4) the air-cooled Compound cooling of air cooling：Just material is cooled down gained into cold bed factory building 2 in step 3, described cold bed factory
Room 2 is as shown in figure 4, including cold bed 6, foundation ditch, ventilator 4 and strong air-cooler 5, cold bed entrance 1 and the cold bed outlet of cold bed factory building 2
Entrance foundation ditch 31 and outlet foundation ditch 37 are respectively equipped with 7, entrance foundation ditch 31 and outlet foundation ditch 37 are stretched out outside cold bed factory building 2, institute
The length of entrance foundation ditch 31, the depth stated are respectively smaller than outlet foundation ditch 37.Entrance foundation ditch 31 and outlet foundation ditch 37 and the lower section base of cold bed 6
Cheat 3 to communicate, stepped, lower rank and the level of outlet foundation ditch 37, upper rank and the level of entrance foundation ditch 31, and 6 times bases of cold bed are presented in foundation ditch 3
Have multiple pillars in hole 3, three after cold bed 6/foundation ditch 3 of a part in install and laterally turn back blend stop.The cold bed factory building 2
Top be provided with ventilator 4, the lower section of cold bed 6 is provided with strong air-cooler 5, strong air-cooler 5 be arranged in cold bed 6 after 1/3rd
Intersection, the strong air-out direction of air-cooler 5 are described cold in order to which cold wind caused by strong air-cooler 5 is blowed to towards entering steel direction
The top portion ventilation device 4 of bed factory building 2, and guided with this at air flow direction ventilator 4 in the whole area of cold bed 6.Ball in this step is flat
Steel is just expected directly to be down to 80 DEG C by 950 DEG C in cooling procedure, can at the uniform velocity advanced, without cooling down stage by stage.Using two end groups
Hole design and ladder air cooling technology, air enter cold bed 6 by the foundation ditch at the both ends of cold bed factory building 2：The air of entrance foundation ditch 31 is natural
Into basic cooling is carried out, cold air heat absorption rises, excluded by the top ventilator 4 of cold bed 6, constantly attracts cold wind to enter from foundation ditch
Enter；Entrance foundation ditch 31 compares shallower, and internal to be turned back design without pillar and bottom surface, its reason is the temperature of porch steel most
Height, air need it is rapid takes away heat, but the section again can not be excessively strong cold, the too high then Wei Shi bodies tissue of initial cooldown rate with
Bainite structure is largely formed, and influences steel product performance.1/3rd realize air blast cooling by strong air-cooler 5 in cold bed 6,
Angle between the air outlet and ventilator 4 of strong air-cooler 5 is 15 °~20 °, and the angle has considered the ascension of hot-air,
Ensure high efficiency flow, and repeatedly turned back by pillar and bottom grooves, increase cooling effect, heat exchange efficiency, fully changed
Hot rear escapes from ventilator 4；The purpose of the step-like design of foundation ditch 3 lie also in reduce air blast cooling for before cold bed 6 three/
The influence of one gentle air cooling, reduces Wei Shi bodies tissue and bainite structure is formed./ 3rd air are from deep, long after cold bed 6
Outlet foundation ditch 37 enters, and foundation ditch posterior transversal is turned back design, the steel progress reducing temperature twice for having carried out strong cold cooling.Use
The above-mentioned air-cooled Compound cooling of this kind of air cooling, cooling velocity lifting (average cooling rate by common air-cooled cold bed 14.5 DEG C/min
Rise to 22.5 DEG C/min), and the poker temperature difference of cold bed is less than 10 DEG C under steel, so as to ensure that in increase cooldown rate
Meanwhile cooling uniformity is ensure that, while also solve super large-scale model flat-bulb steel web because inhomogeneous cooling and deadweight produce
Deformation and cooling wave problem, and cool down early stage too fast Wei Shi bodies tissue and bainite structure largely formed and caused by eventually
The problem of product strength difference.
(5) the first material cooled down carries out subdivision, aligning.The step, can also be straight respectively using subdivision, aligning machinery
Tapping into and align Unit erriger into subdivision, described aligning Unit erriger includes straightener and the disc type cutting equipment in front of it,
Rolled piece opens the junction cutting of two flat-bulb steels during traveling, and the preferable surface quality of split surface can be achieved, and in fact
Present line continuous operations, efficiency high.
The technology of the present invention, make slab local pressure by the way of belling platform and waveform roll again using first pressing groove, it is smaller
Pressure slab can be made fully to spread, i.e., the bigger slab of specification can be spreaded under same pressure；Using " waveform "
Rolling mode make slab that there is less size before being fully deployed, so as to so that certain specification blooming mill production it is bigger
The flat-bulb steel of size, it is achieved thereby that can produces the flat-bulb steel of big specification under conditions of machine is changed without.Air cooling is air-cooled
Compound cooling mode ensure that cooling uniformity while cooldown rate is increased, while also solve super large-scale model ball
Band steel web because of deformation caused by inhomogeneous cooling and deadweight and cooling wave problem, and cool down early stage too fast Wei Shi bodies tissue and
Bainite structure largely formed and caused by finished product intensity difference the problem of.
In order that flat-bulb steel increase elasticity, temperature-controlled rolling optimization can be carried out on the basis of above-described embodiment, produces work
Skill is：Rectangular bloom → heating → BD1 rollings → BD2 rollings → temperature control processing → DRDFThe air-cooled Compound cooling of rolling → air cooling → cold
Cutting straightening processing.Temperature control therein is handled：" waveform " material type temperature is 940 DEG C~1010 DEG C after BD2 rollings, material
Then type cools through water curtain, temperature is down to 700 DEG C~750 DEG C, and continues to carry out D in the temperature rangeRDFRolling.Its mesh
Be make flat-bulb steel increase elasticity.
For there is the naval vessel of particular/special requirement, the hull such as easily hit by floating ice or the warship easily attacked by shell, torpedo,
Optimization of Heat Treatment Process can be carried out on the basis of above-described embodiment, production technology is：Rectangular bloom → heating → BD1 rollings →
BD2 rollings → heat treatment → DRDFAir-cooled Compound cooling → the cold cut of rolling → air cooling divides straightening processing.Described heat treatment process tool
Body is：Between " waveform " material type temperature is 940 DEG C~1010 DEG C after BD2 rollings, material type is immersed in hardening media and is cooled to by force
360 DEG C~410 DEG C, and with the temperature 30 minutes, be then heated to 680 DEG C~700 DEG C, be incubated 30 minutes, enter afterwards
DRDFRolling process, DRDFRolling temperature is not higher than 900 DEG C.Flat-bulb steel further improves its elastic performance after Overheating Treatment, can
Instantaneous impact is sponged by way of elastic deformation, plays cushioning effect, prevents hull to be damaged, avoids the perils of the sea
Occur.
For non-cryogenic environment work naval vessel, because its low temperature impact properties is less demanding, to improve production efficiency, it is empty
In the cold Compound cooling step of cold wind, the high-strength cold bed factory building of improvement, as shown in Figure 5,6, cold bed 6, entrance foundation ditch 31 can be used
Setting with outlet foundation ditch 37, foundation ditch 3, ventilator 4 and strong air-cooler 5 with foregoing cold bed factory building, in addition, the stage casing of cold bed 6 and
Back segment is anterior, that is, controls cold section, top laying condensation comb 9, condenses the water inlet of comb 9 going out by water pump 12 and cistern 10
The mouth of a river connects.In flat-bulb steel cooling procedure, there is temperature difference in the lower regions temperature of flat-bulb steel.It will be injected in condensation comb 9
Cold water, so as to reduce the temperature difference of flat-bulb steel lower regions.Pressurized water tubes 8, described pressure (hydraulic) water are provided with above the front end of cold bed 6
The water inlet of pipe 8 be connected by booster with condensing the delivery port of comb 9, the delivery ports of pressurized water tubes 8 by overflow valve 11 and
The water inlet of cistern 10 is connected, and multiple atomizers 14 linearly arranged, the energy of atomizer 14 are provided with pressurized water tubes 8
It is enough that the stage casing shaped steel upper horizontal of cold bed 6 is pressurizeed water smoke to sprinkling.Because the water inlet of pressurized water tubes 8 is by condensing comb 9
The water with certain temperature after heat exchange, and go out mist direction and the level of cold bed 6, and the water smoke sprayed is easy to be evaporated into water steaming
Gas, a part of heat is taken away, air-flow is from the runaway of ventilator 4 caused by strong air-cooler 5 and ventilator 4, so as to make cold bed 6
Wen Duxiajiang above preceding stage casing, and be not in that water is fallen again.Due to water and not in contact with steel body and cold bed 6, therefore will not
There is the defects of water cooling, pollute rustization.So flat-bulb steel temperature gradient diminishes, and thermal stress is small, and structural stress is small, so as to keep away
Exempt to cause the lower flexural deformation of flat-bulb steel deadweight.Overflow valve 11 can stablize the pressure of pressurized water tubes 8, the pressure in pressurized water tubes 8
Power is excessive, and when water can not spray from atomizer 14 in time, the outlet of overflow valve 11 is opened, and water is discharged into cistern 10, when adding
When pressure in pressure pipe 8 is reduced to desirable value, the port closing of overflow valve 11, so as to reach the pressure in stable pressurized water tubes 8
The purpose of power.
More than use design, the average cooling rate of flat-bulb steel is about 34.80 DEG C/min.Flat-bulb steel is straight in cooling procedure
Connect and be down to 80 DEG C by 950 DEG C, without cooling down stage by stage.Due to installing the top laying condensation comb 9 of flat-bulb steel in cold bed 6, make
Temperature field is than more uniform during cooling for flat-bulb steel, so that the yield strength, tensile strength in flat-bulb steel have greatly
Width improves.
It should be noted that the present invention particular 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 (2)
1. a kind of high-strength marine shaped steel is heat-treated rolling mill practice, it is characterised in that：Production craft step includes：
（1）First blooming mill（BD1）Rolling：Rectangular bloom is spreaded as flat blank through BD1；
（2）Second frame blooming mill（BD2）Rolling：Through BD2 by step（1）Flat blank obtained by middle BD1 is bundled into symmetrical material type, institute
The material type stated includes the plate portion of the thick end in both ends and intermediate thin；Waveform is presented in plate portion；" waveform " material type temperature after BD2 rollings
Spend between 940 DEG C ~ 1010 DEG C, material type to be immersed in hardening media and is cooled to 360 DEG C ~ 410 DEG C by force, and is divided with the temperature 30
Clock, 680 DEG C ~ 700 DEG C are then heated to, are incubated 30 minutes；
（3）Two frame tandem two-roller mills（DRDF）Rolling：Pass through DRDFMaterial type obtained by BD2 is rolled into just material, described first material
There are a depression, recess in the flat-bulb steel being connected including two symmetrical webs, the symmetrical flat-bulb steel web junction of two of which
Thickness is less than the thickness at flat-bulb steel web, and angle is less than 180 ° on two symmetrical flat-bulb steel webs；
（4）The air-cooled Compound cooling of air cooling；By step（3）Middle gained just expects to be cooled down into cold bed factory building；
（5）The first material cooled down carries out subdivision, aligning.
A kind of 2. high-strength marine shaped steel heat treatment rolling mill practice according to claim 1, it is characterised in that：The step
（4）The middle cold bed factory building used includes cold bed, foundation ditch, ventilator and strong air-cooler, and the cold bed entrance and cold bed of cold bed factory building go out
Entrance foundation ditch and outlet foundation ditch are respectively equipped with mouthful, entrance foundation ditch and outlet foundation ditch are stretched out outside cold bed factory building, described entrance
Foundation ditch length, depth are respectively smaller than outlet foundation ditch；Entrance foundation ditch communicates with outlet foundation ditch with foundation ditch below cold bed, and rank is presented in foundation ditch
Scalariform, lower rank and outlet foundation ditch are horizontal, and upper rank is horizontal with entrance foundation ditch, and has multiple pillars under cold bed in foundation ditch, after cold bed
Blend stop of laterally turning back is installed in the foundation ditch of three/part；The top of the cold bed factory building is provided with ventilator, the lower section of cold bed
Strong air-cooler is installed, strong air-cooler is arranged at rear 1/3rd in cold bed, and strong air-cooler air-out direction direction enters steel direction.
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| CN201710769171.4A CN107617640B (en) | 2015-12-09 | 2015-12-09 | High-strength marine section steel heat treatment rolling process |
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| CN201710769171.4A CN107617640B (en) | 2015-12-09 | 2015-12-09 | High-strength marine section steel heat treatment rolling process |
| CN201510903360.7A CN105521992B (en) | 2015-12-09 | 2015-12-09 | A kind of high-strength marine shaped steel preparation technology |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105521992B (en) | 2017-11-03 |
| CN107597842B (en) | 2019-03-12 |
| CN107617640B (en) | 2020-03-20 |
| CN105521992A (en) | 2016-04-27 |
| CN107597842A (en) | 2018-01-19 |
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Denomination of invention: Heat treatment rolling process of high strength marine section steel Effective date of registration: 20211222 Granted publication date: 20200320 Pledgee: Rizhao Bank Co., Ltd Pledgor: RIZHAO STEEL HOLDING GROUP Co.,Ltd. Registration number: Y2021980015819 |