CN104263905B - A kind of control method utilizing quenching press device to implement sea work plate NAC technique - Google Patents
A kind of control method utilizing quenching press device to implement sea work plate NAC technique Download PDFInfo
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- CN104263905B CN104263905B CN201410532352.1A CN201410532352A CN104263905B CN 104263905 B CN104263905 B CN 104263905B CN 201410532352 A CN201410532352 A CN 201410532352A CN 104263905 B CN104263905 B CN 104263905B
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Abstract
The present invention is a kind of control method utilizing quenching press device to implement sea work plate NAC technique, carries out by following operation: 1. sheet metal thickness 20 100mm；Enter stove plate shape≤8mm/m；Glowing furnace heat treatment step: heating total time 1.5H 2H min, H steel plate thickness, min unit of time；Soaking time >=20min, soaking temperature T1 890 910 DEG C；Relation between T2 and T1 is T2 T1=± 5 DEG C；2. close quenching press aerosol device, roller speed 0.30 0.80m/s, coolant water temperature 25 DEG C；The relation between cold temperature T3 and T2 opened by sea work plate is 0 DEG C≤T2 T3≤10 DEG C；The high-pressure side water yield 200 500m/h, upper and lower water ratio 1.20 1.50；Low-pressure end 120 200 m/h, upper and lower water ratio 1.20 1.50；3. going out quenching press 10 25s and measure red temperature, red temperature is 630 680 DEG C, rate of cooling: 4 10 DEG C/s；This method proposes concrete control device from the whole link of heat treatment, it is ensured that temperature is up to standard.
Description
Technical field
The present invention relates to a kind of heat treatment method, be specifically that one utilizes quenching press device to implement sea work plate NAC work
The control method of skill, belongs to steel plate positive fire control refrigeration technique field.
Background technology
NAC technique, is also NCC technique, and its technical characterstic is normalizing+acceleration cooling, and general normalizing steel grade is all that air cooling is complete
Become, and for some steel grades having particular/special requirement, in order to make performance up to standard, it is necessary to steel grade is given bigger cooling rate and has come
Become purpose, be so obtained with the surplus capacity of some strength, the problem brought to prevent follow-up aging strength from reducing；Such
Technique had both been different from online TMCP technique, also had the difference of essence with traditional hardening and tempering process, and its advantage is can be effective
Avoiding the puzzlement of the inhomogeneous cooling that TMCP technique brings, compare hardening and tempering process, owing to its temperature control is cooled to certain scope, institute
To be made without temper, so this kind of technique has special range of application, but it has certain technical difficulty.
And about implementing such technological equipment, domestic relevant enterprise, when implementing this technique, the most all can utilize aerosol
Or ACC device, because the difficulty so controlled is smaller, and utilize what quenching press carried out implementing NAC technique seldom to have report
Road.Because steel quenching is general all below martensite, in actual production below 50 DEG C, so this feature determines quenching press
Design time be doomed its cooling capacity and want big, and control accuracy is not its emphasis.The most effectively utilize quenching press real
Execute this technique, and be allowed to ripe application, need the research deepened continuously.
Research about NAC at present is mainly controlling water yield model, to guarantee the most up to standard of follow-up red temperature, from
And the performance required for ensureing.Such as Chinese patent " quenching technical of a kind of superhigh intensity sea work steel E690 super-thick steel plate " (Shen
Please number: 201310291750.4, the applying date: 2013-07-12) disclose a kind of by controlling the water yield of some groups of nozzles and roller
Speed reaches to control the technical scheme of quenching technical, but whole quenching press is utilized very limited by this technical scheme, and
Whole technique does not has well to be connected with Technology for Heating Processing, it is difficult to ensure that temperature is up to standard in actual production.
Summary of the invention
The technical problem to be solved is to provide and a kind of utilizes quenching press device to implement sea work plate NAC technique
Control method, the present invention is directed to different-thickness sea work slab and is utilizing quenching press to implement NAC technique, carry from the whole link of heat treatment
Go out concrete control device, to guarantee that this technique can preferably be implemented by quenching press, it is ensured that temperature is up to standard.
The present invention solves the technical scheme of above technical problem:
A kind of control method utilizing quenching press device to implement sea work plate NAC technique, mainly by quenching press to sea work
Being controlled property of plate cools down, and carries out by following operation:
Sheet material prescreening operation: sea work plate thickness controls at 20-100mm, the thickness steel plate quenching machine cooling less than 20mm
Ability is excessive, is difficult to control；And steel plate thickness is more than 100mm, its thickness direction cooling uniformity is difficult to reach requirement；Enter stove plate
Shape controls at≤8mm/m, because being to utilize quenching press to implement NAC technique, incoming profile should control, in the least scope, to should be and quench
What lighter was implemented is gapless refrigerating mode, and the steel plate that plate shape is serious can have large effect to cooling uniformity；
Glowing furnace heat treatment step: heating controls at 1.5H-2H min total time, and wherein H is steel plate thickness, when min is
Between unit, for the extra large work plate of 20-100mm scope, so can ensure that heart portion reaches temperature；Soaking time >=20min, all
Hot temperature T1 controls at 890 910 DEG C, is so mainly thickness direction temperature homogeneity consistent, the cold thermo parameters method of follow-up control
The most relatively uniform, beneficially performance is uniform；Relation between tapping temperature T2 and soaking temperature T1 is T2-T1=± 5 DEG C；
Quenching press control cooling working procedure: the core of the NAC technique that quenching press is implemented is exactly the control of refrigerating mode, because quenching press
Functional characteristics determine its complexity, for NAC technique, get hold of roller speed and the setting of the water yield, to meet thickness direction temperature
Spend big requirement, also determine the gradient difference that oralia thickness direction temperature exists, for different-thickness steel plate, when quenching press is started working
Impose a condition for: close quenching press aerosol device, roller speed controls at 0.30-0.80m/s, and coolant water temperature controls at 25 DEG C.
Then sea work plate enters in it by quenching press roller-way, and it is 0 DEG C that Hai Gongban opens the relation between cold temperature T3 and tapping temperature T2
≤ T2-T3≤10 DEG C, because cooling of coming out of the stove has a certain distance, can ensure that follow-up rate of cooling within declining 10 DEG C.
The water yield is opened based on high-pressure side, mainly fast cooling, and low pressure stage is opened primarily to be that temperature control is returned one in surface
Under fixed level, water is then for Strip Shape Control than arranging, and needs to set according to the concrete water yield, roller speed；Quenching press high pressure
End water yield 200-500m/h, upper and lower water ratio is set as 1.20-1.50；Low-pressure end 120-200 m/h, upper and lower water ratio is set as
1.20-1.50；
After air cooling temperature control operation: Hai Gongban goes out quenching press, 10-25s measures red temperature, and red temperature is 630-680 DEG C,
Rate of cooling: 4-10 DEG C/s.
The technical scheme that the present invention limits further as:
Further, in described sheet material prescreening operation, stove Strip Shape Control is entered at≤5mm/m.
Further, sea work plate is D36N or E36N.
Further, sea work plate is D36N, obtains finished steel yield strength 370-400MPa according to described control method,
Tensile strength ＞ 355MPa, elongation percentage ＞ 21% ,-20 DEG C of ballistic work >=60J.
Further, sea work plate is E36N, obtains finished steel yield strength 370-400MPa according to described control method,
Tensile strength ＞ 355MPa, elongation percentage ＞ 21% ,-40 DEG C of ballistic work >=60J.
In a word, the present invention uses and present invention have the advantage that specific aim is very strong, has given full play to the merit of existing quenching press
Can, the production requirement of some special steels can be met；Process control procedure is simple, and the existing quenching press that is entirely of employing is had
Function, easily realize and easily operation；After enforcement, temperature control precision is preferable, and thickness direction temperature homogeneity is preferable, meets NAC
The performance requirement of steel grade；It is further to note that although different quenching press has some similarities and differences due to its structure of modification,
But this control method has certain reference value for the NAC functional development of quenching press with application.
Accompanying drawing explanation
Fig. 1 is the cold curve of control that embodiment 1 simulation calculates；
Fig. 2 is the cold curve of control that embodiment 2 simulation calculates；
Fig. 3 is the cold curve of control that embodiment 3 simulation calculates；
Fig. 4 is the cold curve of control that embodiment 4 simulation calculates.
Detailed description of the invention
Embodiment
Quenching press device is utilized to implement sea work plate NAC technique the one that the present invention relates to below in conjunction with specific embodiment
Control method be described in further detail.
Embodiment 1
Steel grade is the D36N of 20mm；Incoming profile 5mm/m；Heating total time 30min, soaking time 20min；Soaking temperature
890 DEG C, tapping temperature 887 DEG C, open cold temperature 877 DEG C；Roller speed: 0.30m/s；Coolant water temperature controls at 25 DEG C.Quenching press is opened
Pattern: aerosol section is closed；High-pressure side water yield 200m3/ h, water ratio is set as 1.20；Low-pressure end 120 m3/h；Water ratio is set as
1.20；Red temperature point minute is for going out 10s after quenching press, and red temperature is 630 DEG C, rate of cooling: 4.0 DEG C/s.
Embodiment 2
Steel grade is the D36N of 45mm；Incoming profile 4mm/m；Heating total time 65min, soaking time 30min；Soaking temperature
891 DEG C, tapping temperature 889 DEG C, open cold temperature 882 DEG C；Roller speed: 0.48m/s；Coolant water temperature controls at 25 DEG C.Quenching press is opened
Pattern: aerosol section is closed；High-pressure side water yield 260m3/ h, water ratio is set as 1.30；Low-pressure end 150 m3/h；Water ratio is set as
1.30；Red temperature point minute is for going out 12s after quenching press, and red temperature is 635 DEG C, rate of cooling: 5.2 DEG C/s.
Embodiment 3
Steel grade is the E36N of 60mm；Incoming profile 3mm/m；Heating total time 125min, soaking time 40min；Soaking temperature
Spend 908 DEG C, tapping temperature 906 DEG C, open cold temperature 902 DEG C；Roller speed: 0.45m/s；Coolant water temperature controls at 25 DEG C.Quenching press leaves
Open pattern: aerosol section is closed；High-pressure side water yield 350m3/ h, water ratio is set as 1.40；Low-pressure end 180 m3/h；Water ratio is set as
1.40；Red temperature point minute is for going out 18s after quenching press, and red temperature is 660 DEG C, rate of cooling: 6.5 DEG C/s.
Embodiment 4
Steel grade is the E36N of 100mm；Incoming profile 4mm/m；Heating total time 200min, soaking time 50min；Soaking temperature
Spend 910 DEG C, tapping temperature 910 DEG C, open cold temperature 905 DEG C；Roller speed: 0.80m/s；Coolant water temperature controls at 25 DEG C.Quenching press leaves
Open pattern: aerosol section is closed；High-pressure side water yield 500m3/ h, water ratio is set as 1.50；Low-pressure end 200 m3/h；Water ratio is set as
1.50；Red temperature point minute is for going out 25s after quenching press, and red temperature is 680 DEG C, rate of cooling: 10.0 DEG C/s.
When simulating the calculating air cooling curve chart of actual parameter it can be seen that steel plate returns red from Fig. 1-Fig. 4,20,45mm
The steel plate through thickness temperature difference between 20 DEG C, 60, the steel plate through thickness temperature of 100mm between 30 DEG C, such temperature homogeneity
Less；Within during 100s, the thickness direction temperature difference just reaches 10 DEG C, so thickness evenness is preferable.
By utilizing quenching press to implement NAC technique, its steel plate thickness direction temperature homogeneity obtains with the precision of red temperature
To preferably controlling.Additionally by GB, each embodiment steel plate being carried out mechanics properties testing, result is as shown in table 1:
Table 1 for carrying out mechanics properties testing acquired results by GB to each embodiment steel plate:
；
As can be seen from Table 1, utilizing quenching press to implement the extra large work plate of NAC technique, its performance indications are satisfied by classification society and want
Ask.
In addition to the implementation, the present invention can also have other embodiments.All employing equivalents or equivalent transformation shape
The technical scheme become, all falls within the protection domain of application claims.
Claims (5)
1. utilize quenching press device to implement a control method for sea work plate NAC technique, mainly by quenching press to sea work plate
Being controlled property cools down, it is characterised in that: carry out by following operation:
Sheet material prescreening operation: sea work plate thickness controls at 20-100mm；Enter stove Strip Shape Control at≤8mm/m；
Glowing furnace heat treatment step: heating controls at 1.5H-2H min total time, and wherein H is steel plate thickness, min is that the time is single
Position；Soaking time >=20min, soaking temperature T1 controls at 890 910 DEG C；Pass between tapping temperature T2 and soaking temperature T1
System is T2-T1=± 5 DEG C；
Quenching press control cooling working procedure: closing the aerosol device of quenching press, roller speed controls at 0.30-0.80m/s, and coolant water temperature controls
25℃；Then sea work plate enters in it by quenching press roller-way, and Hai Gongban opens the relation between cold temperature T3 and tapping temperature T2
It is 0 DEG C≤T2-T3≤10 DEG C；Quenching press high-pressure side water yield 200-500m/h, upper and lower water ratio is set as 1.20-1.50；Low-pressure end
120-200 m/h, upper and lower water ratio is set as 1.20-1.50；
After air cooling temperature control operation: Hai Gongban goes out quenching press, 10-25s measures red temperature, and red temperature is 630-680 DEG C, cooling
Speed: 4-10 DEG C/s.
Control method the most according to claim 1, it is characterised in that: in described sheet material prescreening operation, enter stove plate shape
Control at≤5mm/m.
Control method the most according to claim 1, it is characterised in that: described sea work plate is D36N or E36N.
Control method the most according to claim 3, it is characterised in that: described sea work plate is D36N, according to described controlling party
Method obtains finished steel yield strength 370-400MPa, tensile strength ＞ 355MPa, elongation percentage ＞ 21% ,-20 DEG C of ballistic work >=60J.
Control method the most according to claim 3, it is characterised in that: described sea work plate is E36N, according to described controlling party
Method obtains finished steel yield strength 370-400MPa, tensile strength ＞ 355MPa, elongation percentage ＞ 21% ,-40 DEG C of ballistic work >=60J.
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| CN106399646A (en) * | 2016-12-12 | 2017-02-15 | 南京钢铁股份有限公司 | Quenching technology of F-grade extra-thick plate for ultrahigh-strength ocean engineering |
| CN108546806B (en) * | 2018-05-11 | 2020-03-31 | 鞍钢股份有限公司 | Method for improving performance of normalized steel plate |
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| JPS53119216A (en) * | 1977-03-28 | 1978-10-18 | Sumitomo Metal Ind Ltd | Manufacture of steel sheet with excellent mechanical properties |
| AU559731B2 (en) * | 1981-11-19 | 1987-03-19 | Kawasaki Steel Corp. | Continuously quenching steel plates |
| CN101307380B (en) * | 2008-06-23 | 2010-08-11 | 秦皇岛首秦金属材料有限公司 | Accelerated cooling process of quenching machine for enhancing intensity of normalized steel plate |
| CN102453846A (en) * | 2010-10-18 | 2012-05-16 | 宝山钢铁股份有限公司 | Heat treatment method for corrosion resistant alloy N08810 steel plate |
| CN102409234A (en) * | 2011-11-14 | 2012-04-11 | 南京钢铁股份有限公司 | Method for manufacturing 355MPa grade low alloy steel plate with welding crack sensitivity index less than 0.23 |
| CN102732789B (en) * | 2012-06-05 | 2015-01-07 | 舞阳钢铁有限责任公司 | High-performance ocean platform steel and its production method |
| CN103045942A (en) * | 2012-12-17 | 2013-04-17 | 南京钢铁股份有限公司 | Method for manufacturing extremely thick marine engineering steel plate with excellent low-temperature brittle fracture resistance |
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