CN103468919B - Method for reducing roll marks on surface of steel plate in quenching furnace - Google Patents
Method for reducing roll marks on surface of steel plate in quenching furnace Download PDFInfo
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Abstract
The invention relates to a method for reducing roll marks on the surface of a steel plate in a quenching furnace, and belongs to the technical field of technologies using quenching furnaces to produce steel plates. A technical scheme adopted by the invention is characterized in that a new temperature field in the furnace is set to make the temperature in the furnace change in a gradient manner and temperatures of a preheating zone and a heating zone in the furnace gradually increase in an arithmetic progression manner, a largest temperature is lower than a quenching temperature, and the temperature of a heat insulation zone is the quenching temperature; the set value of a lower portion temperature of the temperature field in the furnace is 8-20DEG C lower than the set of an upper portion temperature of the temperature field in the furnace; and the wing speed in the steel plate furnace is adjusted to 1-1.2m/min. In the invention, a heating mode combining temperature gradient steel burning and a difference between the upper and lower portion temperatures in the furnace is adopted, and the swing speed in the steel plate furnace is adjusted, so the roll marks on the surface of the steel plate are effectively reduced. The method can control the steel plate roll mark reconditioning area within 10%, ensures that the quality of the surface of a quenched steel plate having high added values accords with requirements, and has a substantial economic benefit.
Description
Technical field
The present invention relates to a kind of minimizing and produce roll marks on quenching furnance light plate surface, to ensure the method for plate surface quality, belong to quenching furnance and produce plater technology field.
Background technology
Along with steel plate market competition is day by day fierce, the visual appearance of user to steel plate is had higher requirement, and as steel plate does not allow soldering, figuring of surface area is no more than 10% requirement such as grade.Produce in steel plate process at quenching furnance, quenching furnance belongs to roller hearth furnace, and the problem of surface of steel plate generation roll marks annoyings the production of roller hearth furnace quenching furnance all the time.Roll marks produce major cause be roller hearth furnace roller aging after, roller can exist the defects such as bulge, pockmark, slag nodule, and steel plate has softened at holding-zone, and the slag nodule protruded will eject a hole at the lower surface of steel to be come, even be attached on steel plate, therefore produce roll marks.
Current control roller hearth furnace produces the method for roll marks except carrying out ball blast to entering stove steel plate, groove is beaten to entering stove Steel ingot feeder head place, reduce stove steel plate to outside the injury of furnace bottom roll, also have by irregularly carrying out logical stove, regulate the measure such as temperature field, but DeGrain, roll marks problem not yet be improved significantly, in addition, also production cost is increased while logical stove causes output too low frequently.
A large amount of steel plates overstocks in reconditioning operation in a large number due to roll marks problem, and especially the reconditioning area of slab is more than 15%, not only increases the labour intensity of reconditioning work, also greatly extends manufacture cycle, and easily causes local minus tolerance after artificial reconditioning simultaneously.Therefore, the roll marks problem of surface of steel plate has a strong impact on production schedule, causes larger negative impact delivery date to contract.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method reducing quenching furnance light plate surface generation roll marks, this method significantly can reduce the roll marks on quenching furnance light plate surface, improve plate surface quality, by the roll marks reconditioning area control of quenching furnance steel plate within 10%, to guarantee that the surface quality of high added value quenched nickelclad meets the requirements.
The technical scheme solved the problems of the technologies described above is:
Reduce the method that quenching furnance light plate surface produces roll marks, it adopts following technique:
1. set a kind of new temperature field in furnace, in-furnace temperature region is divided into preheating zone, heating zone and heat preservation zone successively, in-furnace temperature is thermograde change, in stove, the temperature of preheating zone and heating zone increases progressively gradually in arithmetic progression from low to high, maximum temperature is lower than quenching temperature, and the temperature of heat preservation zone is quenching temperature;
2. the setting of temperature field in furnace temperature of lower is lower than upper temp setting 8-20 DEG C;
3. adjust sway velocity in steel plate furnace, the sway velocity of steel plate is 1-1.2 m/min.
Above-mentioned minimizing quenching furnance light plate surface produces the method for roll marks, in described stove, the thermograde of preheating zone and heating zone is set as 5 grades, their temperature field in furnace upper temp numerical range is 700-730 DEG C respectively, 750-780 DEG C, 800-830 DEG C, 850-900 DEG C, 900-920 DEG C, the Temperature numerical scope of heat preservation zone is 910-930 DEG C, and the setting of temperature field in furnace temperature of lower is lower than upper temp setting 8-12 DEG C.
Above-mentioned minimizing quenching furnance light plate surface produces the method for roll marks, controling of the pressure of the oven adopts top pressure-fired control, and pressure-controlling is at 10-15Pa, and bottom adopts tiny structure to control, and pressure-controlling is negative 0-5Pa.
The method of above-mentioned minimizing quenching furnance light plate surface generation roll marks, adjustment steel plate loads rhythm, and the distance between two block plates that front and back load is greater than 2.5 meters, loads the steel plate at rear portion when anterior loading steel plate tail temperature reaches 750-780 DEG C.
Usefulness of the present invention is:
The present invention adopts thermograde to burn the type of heating that in steel and stove, the top and the bottom temperature difference combines in stove, makes steel plate lower in the temperature of preheating zone and heating zone, and lower surface of steel plate temperature is lower than upper surface simultaneously, effectively reduces surface of steel plate and produces roll marks; The sway velocity of steel plate is adjusted to 1 m/min, reduces the motional inertia of steel plate, decrease roll marks and expand, obtain good result; Adopt upper of furnace body pressure-fired, bottom tiny structure burns steel, changes heat direction of transfer; By controlling steel plate dress steel rhythm, improve heating quality.By the enforcement of aforesaid method, the steel plate roll marks reconditioning area control that quenching furnance is produced, within 10%, is guaranteed that the surface quality of high added value quenched nickelclad meets the requirements, is had significant economic benefit.The logical stove cycle leads to stove by initial 3 classes and once extends to 6-9 class and lead to stove once simultaneously, effectively improves production efficiency, reduces replacing furnace bottom roll spare part expense simultaneously, reduce production cost.
Embodiment
The present invention produces surface of steel plate roll marks by adopting a kind of method reducing quenching furnance light plate surface generation roll marks to reduce quenching furnance, by the roll marks reconditioning area control of quenching furnance steel plate within 10%, to guarantee that the surface quality of high added value quenched nickelclad meets the requirements.
The method that the present invention takes is:
First, set a kind of new temperature field in furnace, in-furnace temperature region is divided into preheating zone, heating zone and heat preservation zone successively, in-furnace temperature is thermograde change, in stove, the temperature of preheating zone and heating zone increases progressively gradually in arithmetic progression from low to high, maximum temperature is lower than quenching temperature, and the temperature of heat preservation zone is quenching temperature.The setting of temperature field in furnace temperature of lower is lower than upper temp setting 8-20 DEG C.
In above-mentioned stove, the thermograde of preheating zone and heating zone is set as 5 grades, their temperature field in furnace upper temp numerical range is 700-730 DEG C respectively, 750-780 DEG C, 800-830 DEG C, 850-900 DEG C, 900-920 DEG C, the temperature of heat preservation zone is 910-930 DEG C, and the setting of temperature field in furnace temperature of lower is lower than upper temp setting 8-12 DEG C.
Secondly, sway velocity in adjustment steel plate furnace, is adjusted to 1-1.2 m/min by sway velocity.
Because steel plate weight is large, in moving process, inertia is large, if steel plate waves at a high speed for a long time in stove, is easily magnified by roll marks in rocking process.Furnace bottom roll diameter 580mm, design rolling period 120 seconds according to quenching furnance, sway velocity 3 ms/min, in rolling period, steel plate runs 6 meters, and furnace bottom roll turns a circumference and approximates 1.82 meters, and within original period of swing, furnace bottom roll need rotate more than 3 circles.After series of experiments, sway velocity is adjusted to 1 m/min, obtains certain effect, both reduced steel plate motional inertia and reduced roll marks expansion, a furnace bottom roll rotation simultaneously circle reduces the generation of local bending phenomenon.
3rd, controling of the pressure of the oven adopts top pressure-fired control, pressure-controlling is at 10-15Pa, and bottom adopts tiny structure to control, and pressure-controlling is negative 0-5Pa.
4th, adjustment steel plate loads rhythm, and the distance between two block plates that front and back load is greater than 2.5 meters, loads the steel plate at rear portion when anterior loading steel plate tail temperature reaches 750-780 DEG C.
Conservative control steel plate dress steel rhythm, effectively reduces roll marks and produces.Quenching furnance is by the short restriction of body of heater, steel plate easily occur in heat-processed head and tail temperature difference greatly namely head meet tapping condition afterbody and also do not enter insulation, thus cause steel plate time inside furnace to extend, if the second block plate enters after in stove at normal dress steel bar part, cool steel absorbs heat in a large number, makes first piece of afterbody more be difficult to enter insulation.For this situation, limit the second block plate and enter stove, the safe distance of two block plates is adjusted to 2.5 meters simultaneously, treat that the first block plate tail temperature reaches more than 750 DEG C, refill the second block plate, can effectively shorten steel plate time inside furnace, thus reduce roll marks generation.
Because quenching furnance burns the advantages such as steel is even, cooling intensity is large, high added value steel alloy or the special-purpose steel such as 12Cr2Mo1R, 15CrMoR (H), 07MnNiMoVDR (L), 13MnNiMoR, 12Cr2Mo1R, 14Cr1MoR (H), WNM400A, WQ960E, NVE690 of the current Development and Production of certain iron and steel enterprise, preferential in quenching furnance process, the surface quality requirements of this type of steel is general very high, therefore, quenching furnance roll marks must effectively be controlled.
Specific examples 1:
Steel grade 12Cr2Mo1R, specification is 60*4070*9080, and in quenching furnance normalizing, normalizing process is 930 DEG C, and PLC+20min is specific as follows:
1, only insulation rear region 10-12 district is set to 930 DEG C, and in stove, preheating zone and Heating Zone Temperature, by increasing progressively gradually in arithmetic progression from low to high, adopt temperature gradient method as shown in the table to burn steel.
2, as shown above, the setting of temperature field in furnace temperature of lower sets 10 DEG C lower than upper temp.
3, sway velocity is set as 1 m/min.
4, on controling of the pressure of the oven, adopt top pressure-fired to control, pressure-controlling is at 10-15Pa, and bottom adopts tiny structure to control, and pressure-controlling is negative 0-5Pa.
5, next block plate is loaded when this block plate tail temperature reaches 780 DEG C, and apart from this block plate 2.5 meters.
This block plate adopts above-mentioned technique to heat, and the less only head of roll marks has slight roll marks, and artificial reconditioning rear surface quality is good.
Specific examples 2:
Steel grade NV E690, specification is 97*2600*12413, and in quenching furnance quenching, quenching technology is 910 DEG C, and PLC+20min is specific as follows:
1, only insulation rear region 10-12 district is set to 910 DEG C, and in stove, preheating zone and Heating Zone Temperature, by increasing progressively gradually in arithmetic progression from low to high, adopt temperature gradient method as shown in the table to burn steel.
2, as shown above, the setting of temperature field in furnace temperature of lower sets 8 DEG C lower than upper temp.
3, sway velocity is set as 1 m/min.
4, on controling of the pressure of the oven, adopt top pressure-fired to control, pressure-controlling is at 10-15Pa, and bottom adopts tiny structure to control, and pressure-controlling is negative 0-5Pa.
5, next block plate is loaded when this block plate tail temperature reaches 750 DEG C, and apart from this block plate 2.5 meters.
This block plate adopts above-mentioned technique to heat, and have no roll marks, surface quality is good.
Specific examples 3:
Steel grade 12Cr2Mo1R, specification is 82*3400*10387, and in quenching furnance normalizing, quenching technology is 930 DEG C, and PLC+20min is specific as follows:
1, only insulation rear region 10-12 district is set to 930 DEG C, and in stove, preheating zone and Heating Zone Temperature, by increasing progressively gradually in arithmetic progression from low to high, adopt temperature gradient method as shown in the table to burn steel.
2, as shown above, the setting of temperature field in furnace temperature of lower sets 12 DEG C lower than upper temp.
3, sway velocity is set as 1 m/min.
4, on controling of the pressure of the oven, adopt top pressure-fired to control, pressure-controlling is at 10-15Pa, and bottom adopts tiny structure to control, and pressure-controlling is negative 0-5Pa.
5, next block plate is loaded when this block plate tail temperature reaches 780 DEG C, and apart from this block plate 2.5 meters.
This block plate adopts above-mentioned technique to heat, and have no roll marks, surface quality is good.
Specific examples 4:
Steel grade WQ690D, specification is 100*2320*10080, and in quenching furnance quenching, quenching technology is 910 DEG C, and PLC+20min is specific as follows:
1, only insulation rear region 10-12 district is set to 910 DEG C, and in stove, preheating zone and Heating Zone Temperature, by increasing progressively gradually in arithmetic progression from low to high, adopt temperature gradient method as shown in the table to burn steel.
2, as shown above, the setting of temperature field in furnace temperature of lower sets 20 DEG C lower than upper temp.
3, sway velocity is set as 1 m/min.
4, on controling of the pressure of the oven, adopt top pressure-fired to control, pressure-controlling is at 10-15Pa, and bottom adopts tiny structure to control, and pressure-controlling is negative 0-5Pa.
5, next block plate is loaded when this block plate tail temperature reaches 750 DEG C, and apart from this block plate 2.5 meters.
This block plate adopts above-mentioned technique to heat, and have no roll marks, surface quality is good.
Claims (1)
1. reduce the method that quenching furnance light plate surface produces roll marks, it is characterized in that: it adopts following technique:
(1) a kind of new temperature field in furnace is set, in-furnace temperature region is divided into preheating zone, heating zone and heat preservation zone successively, in-furnace temperature is thermograde change, in stove, the temperature of preheating zone and heating zone increases progressively gradually in arithmetic progression from low to high, maximum temperature is lower than quenching temperature, and the temperature of heat preservation zone is quenching temperature;
(2) setting of temperature field in furnace temperature of lower is lower than upper temp setting 8-20 DEG C;
(3) adjust sway velocity in steel plate furnace, the sway velocity of steel plate is 1-1.2 m/min;
In described stove, the thermograde of preheating zone and heating zone is set as 5 grades, their temperature field in furnace upper temp numerical range is 700-730 DEG C respectively, 750-780 DEG C, 800-830 DEG C, 850-900 DEG C, 900-920 DEG C, the Temperature numerical scope of heat preservation zone is 910-930 DEG C, and the setting of temperature field in furnace temperature of lower is lower than upper temp setting 8-12 DEG C;
Steel grade 12Cr2Mo1R, specification is 60*4070*9080, and in quenching furnance normalizing, normalizing process is 930 DEG C, and PLC+20min is specific as follows:
(1), only insulation rear region 10-12 district is set to 930 DEG C, and in stove, preheating zone and Heating Zone Temperature are by increasing progressively gradually in arithmetic progression from low to high, the setting of temperature field in furnace temperature of lower sets 10 DEG C lower than upper temp, adopts following temperature gradient method to burn steel:
1st 730 DEG C, top, district, 720 DEG C, bottom; 2nd 780 DEG C, top, district, 770 DEG C, bottom; 3rd 830 DEG C, top, district, 820 DEG C, bottom; 4th 900 DEG C, top, district, 890 DEG C, bottom; 920 DEG C, top, 5-9 district, 910 DEG C, bottom; 930 DEG C, top, 10-12 district, 920 DEG C, bottom;
(2), sway velocity is set as 1 m/min;
(3), on controling of the pressure of the oven, adopt top pressure-fired to control, pressure-controlling is at 10-15Pa, and bottom adopts tiny structure to control, and pressure-controlling is negative 0-5Pa;
(4), this block plate tail temperature loads next block plate when reaching 780 DEG C, and apart from this block plate 2.5 meters.
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| CN105314987B (en) * | 2014-05-26 | 2018-02-23 | 中国科学院金属研究所 | A kind of sintering process of ceramic core |
| CN110512055B (en) * | 2018-05-22 | 2021-03-12 | 宝山钢铁股份有限公司 | Method for treating strip steel nodulation impression defects in horizontal annealing furnace |
| CN108754085A (en) * | 2018-07-02 | 2018-11-06 | 洛阳Lyc轴承有限公司 | A kind of GCr15 small steels thin-wall bearing ferrule Bainitic hardening process |
| CN111020174A (en) * | 2019-12-11 | 2020-04-17 | 舞阳钢铁有限责任公司 | Method for reducing roll marks generated on surface of steel plate in quenching furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2885881Y (en) * | 2006-04-10 | 2007-04-04 | 范本良 | Full-electric roller hearth-type continuous annealing furnace |
| CN102851477A (en) * | 2011-06-28 | 2013-01-02 | 鞍钢股份有限公司 | Method for reducing hearth roll mark defect on steel plate surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2820148B1 (en) * | 2001-01-31 | 2003-10-31 | Stein Heurtey | IMPROVEMENTS IN METHODS FOR HEATING STEEL STRIPS IN VERTICAL OVENS |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2885881Y (en) * | 2006-04-10 | 2007-04-04 | 范本良 | Full-electric roller hearth-type continuous annealing furnace |
| CN102851477A (en) * | 2011-06-28 | 2013-01-02 | 鞍钢股份有限公司 | Method for reducing hearth roll mark defect on steel plate surface |
Non-Patent Citations (2)
| Title |
|---|
| 中厚板无抛丸常化炉炉辊结瘤控制;杨振东;《轧钢》;20100228;第27卷(第1期);第3节 * |
| 钢板常化辊印的分析及预防;张四民;《宽厚板》;19990331;第5卷(第3期);第1、5节 * |
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