CN104263905A - Control method for performing NAC (normalizing and accelerated cooling) on marine board by hardening machine - Google Patents
Control method for performing NAC (normalizing and accelerated cooling) on marine board by hardening machine Download PDFInfo
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- CN104263905A CN104263905A CN201410532352.1A CN201410532352A CN104263905A CN 104263905 A CN104263905 A CN 104263905A CN 201410532352 A CN201410532352 A CN 201410532352A CN 104263905 A CN104263905 A CN 104263905A
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Abstract
The invention discloses a control method for performing NAC (normalizing and accelerated cooling) on a marine board by a hardening machine. The control method is carried out according to the following processes: 1, The board pre-screening process: the board thickness is controlled to be 20-100 mm, and the shape of a board entering a furnace is controlled to be less than or equal to 8 mm/m; 2, the heat treatment process by a hardening furnace: the total heating time is controlled to be 1.5 H-2 Hmin, wherein H is the board thickness and the min is the time unit; the soaking time is longer than or equal to 20 min and the soaking temperature T1 is controlled to be 890-910 DEG C; the relationship between T2 and T1 is that T2 minus T1 is equal to plus or minus 5 DEG C; 3, the controlled cooling process by the hardening machine: an aerial fog device of the hardening machine is closed, the roller speed is controlled to be 0.30-0.80 m/s and the cooling water temperature is controlled to be 25 DEG C; the relationship between the initial marine board cooling temperature T3 and the T2 is that T2 minus T3 is larger than or equal to 0 DEG C, but smaller than or equal to 10 DEG C; the water amount at the high-pressure end of the hardening machine is 200-500 m<3>/h, the feeding-draining water ratio is set to be 1.20-1.50; the water amount at the low-pressure end is 120-200 m<3>/h, the feeding-draining water ratio is set to be 1.20-1.50; 4, the air-cooling temperature-control process: after the marine board is taken out from the hardening machine for 10-25s, the self-tempering temperature is measured, the self-tempering temperature is 630-680 DEG C and the cooling speed is 4-10 DEG C/s. Through the control method, specific control measures are provided from the whole heat treatment process so as to ensure the temperature to reach the standard.
Description
Technical field
The present invention relates to a kind of heat treating method, be specifically a kind of control method utilizing quenching press device to implement extra large work plate NAC technique, belong to steel plate positive fire control refrigeration technique field.
Background technology
NAC technique, also NCC technique is, its technical characterstic is normalizing+accelerating cooling, general normalizing steel grade is all that air cooling completes, and concerning some have the steel grade of particular requirement, in order to make performance up to standard, larger cooling rate must be given to complete object to steel grade, so just can obtain the surplus capacity of some strength, reduce to prevent follow-up aging strength the problem brought; Such technique had both been different from online TMCP technique, also the difference of essence is had with traditional hardening and tempering process, its advantage is the puzzlement of the inhomogeneous cooling can effectively avoiding TMCP technique to bring, to compare hardening and tempering process, because its temperature control is cooled to certain scope, so do not need to carry out temper, so this kind of technique has special range of application, but it has certain technical difficulty.
And about implementing such tooling, domestic relevant enterprise, when implementing this technique, generally all can utilize aerosol or ACC device, because the difficulty controlled like this is smaller, and utilize quenching press to carry out implementing NAC technique seldom have report.Because steel quenching is general all below martensite, in actual production below 50 DEG C, so be doomed its cooling power when this feature determines the design of quenching press to want large, and control accuracy is not its emphasis.So how effectively to utilize quenching press to implement this technique, and make it ripe application, need the research deepened continuously.
At present about the research of NAC mainly at control water yield model, to guarantee the precisely up to standard of follow-up red temperature, thus the performance required for ensureing.Such as Chinese patent " quenching technology of a kind of superstrength sea work steel E690 super-thick steel plate " (application number: 201310291750.4, the applying date: 2013-07-12) disclose a kind of water yield by controlling some groups of nozzles and roller speed reaches the technical scheme controlling quenching technology, but this technical scheme is very limited to the utilization of whole quenching press, and whole technique does not have well to be connected with thermal treatment process, be difficult to ensure that temperature is up to standard in actual production.
Summary of the invention
Technical problem to be solved by this invention is, a kind of control method utilizing quenching press device to implement extra large work plate NAC technique is provided, the present invention is directed to different thickness sea work slab and utilize quenching press enforcement NAC technique, from the whole link of thermal treatment, concrete control device is proposed, to guarantee that quenching press can implement this technique preferably, ensure that temperature is up to standard.
The present invention solves the technical scheme of above technical problem:
Utilize quenching press device to implement a control method for extra large work plate NAC technique, mainly utilize quenching press to carry out controlling cooling to extra large work plate, undertaken by following operation:
Sheet material prescreen operation: extra large work plate thickness controls at 20-100mm, the steel plate quenching machine cooling power that thickness is less than 20mm is excessive, is difficult to control; And steel plate thickness is greater than 100mm, its thickness direction cooling uniformity is difficult to reach requirement; Enter stove Strip Shape Control at≤8mm/m, because be utilize quenching press to implement NAC technique, incoming profile should control in very little scope, and what should be that quenching press implements is gapless cooling mode, and the steel plate that plate shape is serious can have larger impact to cooling uniformity;
Quenching furnance heat treatment step: heating controls at 1.5H-2H min total time, and wherein H is steel plate thickness, and min is time unit, can ensure that heart portion reaches temperature like this concerning the extra large work plate of 20-100mm scope; Soaking time >=20min, soaking temperature T1 control at 890-910 DEG C, and so mainly thickness direction temperature homogeneity is consistent, and the cold thermo parameters method of follow-up control is also relatively uniform, is conducive to the even of performance; Pass 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 cooling mode, because the functional characteristics of quenching press determines its complicacy, concerning NAC technique, get hold of the setting of roller speed and the water yield, to meet the large requirement of thickness direction temperature, also the gradient difference that oralia thick direction temperature exists is determined, for different thickness steel plate, when quenching press is started working impose a condition for: close the aerosol device of quenching press, roller speed control is built in 0.30-0.80m/s, and cooling water temperature control is built in 25 DEG C.Then extra large work plate enters in it by quenching press roller-way, and the Hai Gongban pass of opening between cold temperature T3 and tapping temperature T2 is 0 DEG C≤T2-T3≤10 DEG C, because cooling of coming out of the stove has certain distance, declines within 10 DEG C and can ensure follow-up speed of cooling.The water yield is opened based on high-pressure side, mainly fast cooling, and low-pressure stage is opened mainly in order to be that temperature control is returned under certain level in surface, and water is then in order to Strip Shape Control than arranging, and needs to set according to the concrete water yield, roller speed; Quenching press high-pressure side water yield 200-500m3/h, upper and lower water ratio is set as 1.20-1.50; Low pressure end 120-200 m3/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, speed of cooling: 4-10 DEG C/s.
The technical scheme that the present invention limits further is:
Further, in described sheet material prescreen operation, enter stove Strip Shape Control at≤5mm/m.
Further, extra large work plate is D36N or E36N.
Further, extra large work plate is D36N, obtains Finished Steel yield strength 370-400MPa according to described control method, tensile strength > 355MPa, unit elongation > 21% ,-20 DEG C of ballistic work >=60J.
Further, extra large work plate is E36N, obtains Finished Steel yield strength 370-400MPa according to described control method, tensile strength > 355MPa, unit elongation > 21% ,-40 DEG C of ballistic work >=60J.
In a word, the present invention adopts tool of the present invention to have the following advantages: specific aim is very strong, has given full play to the function of existing quenching press, can meet the production requirement of some special steels; Process control procedure is simple, whole functions being existing quenching press and having of employing, easily realizes and easy to operate; After implementing, temperature control precision is better, and thickness direction temperature homogeneity is better, meets the performance requriements of NAC steel grade; It should be noted that in addition, although different quenching press has some similarities and differences due to its structure of modification, 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 of embodiment 1 analog calculation;
Fig. 2 is the cold curve of control of embodiment 2 analog calculation;
Fig. 3 is the cold curve of control of embodiment 3 analog calculation;
Fig. 4 is the cold curve of control of embodiment 4 analog calculation.
Embodiment
embodiment
Below in conjunction with specific embodiment, a kind of control method utilizing quenching press device to implement extra large work plate NAC technique that the present invention relates to is 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, opens cold temperature 877 DEG C; Roller speed: 0.30m/s; Cooling water temperature control is built in 25 DEG C.Quenching press open mode: aerosol section is closed; High-pressure side water yield 200m
3/ h, water ratio is set as 1.20; Low pressure end 120 m
3/ 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, speed 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, opens cold temperature 882 DEG C; Roller speed: 0.48m/s; Cooling water temperature control is built in 25 DEG C.Quenching press open mode: aerosol section is closed; High-pressure side water yield 260m
3/ h, water ratio is set as 1.30; Low pressure end 150 m
3/ 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, speed 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 908 DEG C, tapping temperature 906 DEG C, opens cold temperature 902 DEG C; Roller speed: 0.45m/s; Cooling water temperature control is built in 25 DEG C.Quenching press open mode: aerosol section is closed; High-pressure side water yield 350m
3/ h, water ratio is set as 1.40; Low pressure end 180 m
3/ 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, speed 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 910 DEG C, tapping temperature 910 DEG C, opens cold temperature 905 DEG C; Roller speed: 0.80m/s; Cooling water temperature control is built in 25 DEG C.Quenching press open mode: aerosol section is closed; High-pressure side water yield 500m
3/ h, water ratio is set as 1.50; Low pressure end 200 m
3/ 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, speed of cooling: 10.0 DEG C/s.
Simulate in the calculating air cooling graphic representation of actual parameter as can be seen from Fig. 1-Fig. 4: when steel plate returns red, 20, the steel plate full thickness temperature difference of 45mm between 20 DEG C, 60, the steel plate full thickness temperature of 100mm between 30 DEG C, such temperature homogeneity is less; During 100s, the thickness direction temperature difference just reaches within 10 DEG C, so thickness evenness is better.
By utilizing quenching press to implement NAC technique, the precision of its steel plate thickness direction temperature homogeneity and red temperature is controlled preferably.Carry out mechanics properties testing by GB to each embodiment steel plate in addition, result is as shown in table 1:
Table 1 is for carry out mechanics properties testing acquired results by GB to each embodiment steel plate:
As can be seen from Table 1, utilize quenching press to implement the extra large work plate of NAC technique, its performance index all meet surveying society's requirement.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (5)
1. utilize quenching press device to implement a control method for extra large work plate NAC technique, mainly utilize quenching press to carry out controlling cooling to extra large work plate, it is characterized in that: undertaken by following operation:
Sheet material prescreen operation: extra large work plate thickness controls at 20-100mm; Enter stove Strip Shape Control at≤8mm/m;
Quenching furnance heat treatment step: heating controls at 1.5H-2H min total time, and wherein H is steel plate thickness, and min is time unit; Soaking time >=20min, soaking temperature T1 control at 890-910 DEG C; Pass between tapping temperature T2 and soaking temperature T1 is T2-T1=± 5 DEG C;
Quenching press control cooling working procedure: the aerosol device of closing quenching press, roller speed control is built in 0.30-0.80m/s, and cooling water temperature control is built in 25 DEG C; Then extra large work plate enters in it by quenching press roller-way, and the Hai Gongban pass of opening between cold temperature T3 and tapping temperature T2 is 0 DEG C≤T2-T3≤10 DEG C; Quenching press high-pressure side water yield 200-500m3/h, upper and lower water ratio is set as 1.20-1.50; Low pressure end 120-200 m3/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, speed of cooling: 4-10 DEG C/s.
2. control method according to claim 1, is characterized in that: in described sheet material prescreen operation, enters stove Strip Shape Control at≤5mm/m.
3. control method according to claim 1, is characterized in that: described extra large work plate is D36N or E36N.
4. control method according to claim 3, it is characterized in that: described extra large work plate is D36N, Finished Steel yield strength 370-400MPa is obtained according to described control method, tensile strength > 355MPa, unit elongation > 21% ,-20 DEG C of ballistic work >=60J.
5. control method according to claim 3, it is characterized in that: described extra large work plate is E36N, Finished Steel yield strength 370-400MPa is obtained according to described control method, tensile strength > 355MPa, unit elongation > 21% ,-40 DEG C of ballistic work >=60J.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN108546806A (en) * | 2018-05-11 | 2018-09-18 | 鞍钢股份有限公司 | A method of improving normalizing state plate property |
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| US4575052A (en) * | 1981-11-19 | 1986-03-11 | Kawasaki Steel Corporation | Apparatus for continuously quenching a steel plate |
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| 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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| JPS53119216A (en) * | 1977-03-28 | 1978-10-18 | Sumitomo Metal Ind Ltd | Manufacture of steel sheet with excellent mechanical properties |
| US4575052A (en) * | 1981-11-19 | 1986-03-11 | Kawasaki Steel Corporation | Apparatus for continuously quenching a steel plate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108546806A (en) * | 2018-05-11 | 2018-09-18 | 鞍钢股份有限公司 | A method of improving normalizing state plate property |
| 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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