CN107988479A - A kind of quasi- differential temperature heat treatment method of large scale roll - Google Patents
A kind of quasi- differential temperature heat treatment method of large scale roll Download PDFInfo
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- CN107988479A CN107988479A CN201711477829.0A CN201711477829A CN107988479A CN 107988479 A CN107988479 A CN 107988479A CN 201711477829 A CN201711477829 A CN 201711477829A CN 107988479 A CN107988479 A CN 107988479A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000010791 quenching Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 230000000171 quenching effect Effects 0.000 claims abstract description 13
- 239000007921 spray Substances 0.000 claims abstract description 8
- 239000000919 ceramic Substances 0.000 claims abstract description 6
- 239000000835 fiber Substances 0.000 claims abstract description 6
- 238000005496 tempering Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
- 238000003672 processing method Methods 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000035772 mutation Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The present invention relates to a kind of quasi- differential temperature heat treatment method of large scale roll, belong to technical field of heat treatment.Processing method includes：The size of the roll handled as needed and requirement select suitable chamber type electric resistance furnace；It is fixed on after being protected using ceramic fibre to the roll neck of roll on the support pad workpiece in chamber type electric resistance furnace；First heated with the first default heating rate, until reaching first stage temperature, and the first preset time of temperature in the first stage；Heated with the second default heating rate, after reaching hardening heat, come out of the stove after keeping the temperature the second preset time again；Misting cooling is carried out in 10min after coming out of the stove and arrives second stage temperature, after quenching with the first default wind pressure cooling is blowed in spray, return temperature terminate and be no more than after phase III temperature can shove charge be tempered.After the present invention can carry out quasi- differential temperature heat treatment to large scale roll, realize while body surface certain thickness is completed to quench, roll neck and the core still treatment effect with certain toughness.
Description
Technical field
The present invention relates to a kind of quasi- differential temperature heat treatment method of large scale roll, belong to technical field of heat treatment.
Background technology
Roll transmits moment of torsion by roll neck and drives the body of roll to rotate, so that rolling workpiece, it is desirable to which roll neck and body of roll core have
Certain toughness, and body of roll outer layer is the working lining with certain thickness and with some strength.Traditional bulk heat treatmet without
Method meets design requirement, and differential temperature heat treatment is answered pregnant and given birth to.But the burner hearth cavity size of conventional different temperature heat treatment furnace is limited, can not
Realize the heat treatment work of large scale roll.Requirement of the chamber type electric resistance furnace to workpiece size is low, but how to ensure that differential temperature is heat-treated
Effect be a big technical bottleneck.
Heat treatment urgent problem is carried out for above-mentioned large scale roll at present, it is necessary to a kind of large scale is provided and is rolled
The quasi- differential temperature heat treatment method of roller, after carrying out quasi- differential temperature heat treatment to large scale roll using chamber type electric resistance furnace, is realized in the body of roll
While surface certain thickness completes quenching, roll neck and the core still treatment effect with certain toughness.
The content of the invention
The object of the present invention is to provide a kind of quasi- differential temperature heat treatment method of large scale roll, using chamber type electric resistance furnace to big
After size roll carries out quasi- differential temperature heat treatment, realize that roll neck and core are still while body surface certain thickness is completed to quench
Treatment effect with certain toughness.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of quasi- differential temperature heat treatment method of large scale roll, comprises the following steps,
1）, as needed the size of roll that handles and require to select suitable chamber type electric resistance furnace；
2）, the roll neck of roll to be treated is protected using ceramic fibre after be fixed on support pad work in chamber type electric resistance furnace
On part；
3）, first heated with the first default heating rate, until reaching first stage temperature, and temperature in the first stage
First preset time；
4）, again heated with the second default heating rate, after reaching hardening heat, come out of the stove after keeping the temperature the second preset time；
5）, come out of the stove after misting cooling carried out in 10min arrive second stage temperature, spray quench after with the first default wind pressure progress
Quenching, returns temperature and terminates and can shove charge tempering no more than after phase III temperature.
Technical solution of the present invention further improvement lies in that：Step 1）In roll to be treated barrel diameter
800mm -1800mm, working lining require thickness to be more than or equal to 50mm.
Technical solution of the present invention further improvement lies in that：Step 1）In the long 12000mm of chamber type electric resistance furnace, width
3000mm, high 2200mm, heating power are not less than 5KW.
Technical solution of the present invention further improvement lies in that：Step 2）In support pad workpiece requirement apart from upper and lower, left and right
Furnace wall distance is not less than 150mm.
Technical solution of the present invention further improvement lies in that：Step 3）In the first default heating rate be less than or equal to 15
DEG C/heating rate of h.
Technical solution of the present invention further improvement lies in that：Step 3）In first stage temperature be 500 DEG C -600 DEG C, the
One preset time is 15h.
Technical solution of the present invention further improvement lies in that：Step 4）In the second default heating rate be more than or equal to 80
DEG C/heating rate of h, hardening heat is 920 DEG C -960 DEG C, and the second preset time is 5h-8h.
Technical solution of the present invention further improvement lies in that：Step 5）In second stage temperature be 200 DEG C -300 DEG C, the
Three phase temperatures are less than or equal to 300 DEG C.
Technical solution of the present invention further improvement lies in that：Step 5）In the first default wind pressure be 0.2MPa wind pressure.
Technical solution of the present invention further improvement lies in that：Step 5）In the wind pressure of misting cooling be 0.4Mpa, hydraulic pressure
For 0.3MPa, spray time 50min-60min.
By adopting the above-described technical solution, the technique effect that the present invention obtains has：
The present invention utilizes large-sized chamber type electric resistance furnace, and inside installs support pad workpiece additional, is heated evenly roll to be treated；Profit
The roll neck of roll to be treated is protected with ceramic fibre, ensures that the roll neck of roll and the heating temperature of the body of roll have relatively
The stable temperature difference；By controlling the heating power of chamber type electric resistance furnace, the accurate programming rate for controlling chamber type electric resistance furnace, during insulation
Between；Low-temperature zone was ensured that attribute mutation will not occur for roll, was influenced at last differential temperature heat with the first default heating rate heating early period
The effect of reason；And the first temperature stage keep the temperature the first preset time be ensure roll it is full-scale it is interior ductility transition temperature with
On；Afterwards with maximum heating power, with the second default heating rate heated roll, make skin of the roll reach austenitizing temperature with
On, that is, reach hardening heat；The second preset time is kept the temperature again, makes the abundant austenitizing of working lining of the body of roll, core and roll neck are still
Locate below austenitizing temperature, achieve the purpose that differential temperature is heat-treated；The length of second preset time determines the heated of the body of roll
The work layer thickness being heat-treated afterwards；Shove charge is tempered after rapid misting cooling after heating, achievees the purpose that quenching, is further protected
Demonstrate,prove the effect of the quasi- differential temperature heat treatment of roll.
The size and heating power of the chamber type electric resistance furnace of the present invention have fully ensured that pending large scale roll can be realized
Differential temperature is heat-treated；Support pad workpiece requirement in chamber type electric resistance furnace is not less than 150mm apart from upper and lower, left and right furnace wall distance,
It physically ensure that the thermally equivalent of roll.
The default heating rate of the first of cold stage is less than or equal to 15 DEG C/h in technical scheme, ensure that roll
It is at the uniform velocity heated, hot attribute will not undergo mutation；500 DEG C -600 DEG C of first stage temperature, ensure that the hot temperature of roll exists
It is more than ductility transition temperature；And 15h is kept the temperature, has substantially ensured that the plastic deformation of roll.
The heating power of the chamber type electric resistance furnace maximum of the present invention ensure that the second default heating rate can use a higher value,
In technical scheme the second heating rate of the default heating rate more than or equal to 80 DEG C/h make the body of roll of roll quickly by
Heat, and the roll neck of roll under the protection of ceramic fibre with body of roll bad student's temperature difference, reach the effect of differential temperature.
Hardening heat is 920 DEG C -960 DEG C in technical scheme, higher than 890 DEG C of the austenitizing temperature of roll,
Far below melting temperature, the purpose of heat treatment is reached；Insulation 5h-8h makes the abundant austenitizing of the working lining of the body of roll, working lining
The thickness of austenitizing has reached the requirement more than or equal to 50mm.
10min internal sprayings cool down after roll is come out of the stove in technical scheme, and the wind pressure of misting cooling is 0.4Mpa, water
Press as 0.3MPa, spray time 50min-60min, make roll misting cooling to second stage temperature, i.e., 200 DEG C -300 DEG C,
It ensure that the quick cooling of roll.
Spray continues quenching after quenching in technical scheme, and the default wind pressure of quenching is 0.2MPa,
Roll is returned temperature and be no more than phase III temperature, i.e., after 300 DEG C, shove charge is tempered, completion quenching technical；Fully ensure that quasi- differential temperature heat
The effect of processing, while the body surface certain thickness of roll is completed quenching, roll neck and core still have certain toughness.
Brief description of the drawings
Fig. 1 is the quasi- differential temperature heat-treating methods flow chart of the present invention；
Fig. 2 is the temperature profile of the quasi- differential temperature heat treatment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described in further details the present invention：
The invention discloses a kind of quasi- differential temperature heat treatment method of large scale roll, for the heat treatment to large scale roll.Under
Face is specific embodiment.
Disclosed by the invention is a kind of quasi- differential temperature heat treatment method of large scale roll, and this method can be realized in body of roll table
While face certain thickness completes quenching, roll neck and the core still treatment effect with certain toughness.Fig. 1 is the stream of this method
Cheng Tu, this method comprise the following steps：
1）, as needed the barrel diameter 800mm -1800mm of roll, the quenching thickness of working lining requirement that handle be 50mm,
The long 12000mm of chamber type electric resistance furnace, width 3000mm, the high 2200mm of selection, heating power are not less than 5KW.
2）, the roll neck of roll to be treated is protected using ceramic fibre after be fixed on branch in chamber type electric resistance furnace
Pad on workpiece；The requirement of support pad workpiece is not less than 150mm apart from upper and lower, left and right furnace wall distance.
3）, chamber type electric resistance furnace first heated with the warm speed less than or equal to 15 DEG C/h, until the body of roll temperature of roll reaches
To 500 DEG C -600 DEG C, chamber type electric resistance furnace keeps the temperature 15h.
4）, chamber type electric resistance furnace heated again with the warm speed more than or equal to 80 DEG C/h, the body of roll temperature of roll, which reaches, quenches
After fiery 920 DEG C -960 DEG C of temperature, chamber type electric resistance furnace insulation 5h-8h.
5）, roll misting cooling is carried out after coming out of the stove in 10min, the wind pressure of misting cooling is 0.4Mpa, and hydraulic pressure is
0.3MPa, spray time 50min-60min, the body of roll temperature of roll are cooled to 200 DEG C -300 DEG C, after with the wind pressure of 0.2Mpa
Cooling is blowed, return temperature terminate and roll body of roll temperature be no more than 300 DEG C after can shove charge tempering.
The present invention carries out large-sized roll quasi- differential temperature heat treatment, the body of roll of the roll after heat treatment with chamber type electric resistance furnace
Notable difference is presented in outer tissue, hardness and core of the roll and roll neck tissue, hardness：Body of roll tissue is tempered martensite+carbon
Compound, hardness range 70HSD-80HSD, core and roll neck tissue are sorbite, hardness range 35HSD-45HSD.
Fig. 2 be the large scale roll that the body of roll working lining thickness requirement of roll is 50mm quasi- temperature difference processing method under in stove
The body of roll temperature profile.
Roll heats in chamber type electric resistance furnace, on the body of roll of roll equipped with can detection temperature in real time thermocouple.For
Larger-size roll, the diverse location of its body of roll can be equipped with the thermocouple of multiple detection temperatures；The control ginseng of the technical program
Examine the temperature averages for the thermocouple that temperature is the multiple detection temperature.
Roll is first heated to 100 DEG C, does not during which control heating rate, after keeping the temperature 3h, with less than or equal to 15 DEG C/h's
Heating rate is heated, and after being heated to 500 DEG C, after keeping the temperature 15h, total power is carried out with the heating rate more than or equal to 80 DEG C/h
Quick heating, is heated to 920 DEG C, cooling of coming out of the stove after insulation 5h, quenching.
Obviously, the above embodiments are merely examples for clarifying the description, and the restriction not to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (10)
- A kind of 1. quasi- differential temperature heat treatment method of large scale roll, it is characterised in that：Comprise the following steps,1）, as needed the size of roll that handles and require to select suitable chamber type electric resistance furnace；2）, the roll neck of roll to be treated is protected using ceramic fibre after be fixed on support pad work in chamber type electric resistance furnace On part；3）, first heated with the first default heating rate, until reaching first stage temperature, and temperature in the first stage First preset time；4）, again heated with the second default heating rate, after reaching hardening heat, come out of the stove after keeping the temperature the second preset time；5）, come out of the stove after misting cooling carried out in 10min arrive second stage temperature, spray quench after with the first default wind pressure progress Quenching, returns temperature and terminates and can shove charge tempering no more than after phase III temperature.
- A kind of 2. quasi- differential temperature heat treatment method of large scale roll according to claim 1, it is characterised in that：Step 1）In The barrel diameter 800mm -1800mm of roll to be treated, working lining require thickness to be more than or equal to 50mm.
- A kind of 3. quasi- differential temperature heat treatment method of large scale roll according to claim 1, it is characterised in that：Step 1）In The long 12000mm of chamber type electric resistance furnace, width 3000mm, high 2200mm, heating power is not less than 5KW.
- A kind of 4. quasi- differential temperature heat treatment method of large scale roll according to claim 1, it is characterised in that：Step 2）In Support pad workpiece requirement apart from upper and lower, left and right furnace wall distance be not less than 150mm.
- A kind of 5. quasi- differential temperature heat treatment method of large scale roll according to claim 1, it is characterised in that：Step 3）In The first default heating rate be the heating rate less than or equal to 15 DEG C/h.
- A kind of 6. quasi- differential temperature heat treatment method of large scale roll according to claim 1, it is characterised in that：Step 3）In First stage temperature be 500 DEG C -600 DEG C, the first preset time is 15h.
- A kind of 7. quasi- differential temperature heat treatment method of large scale roll according to claim 1, it is characterised in that：Step 4）In The second default heating rate be the heating rate more than or equal to 80 DEG C/h, hardening heat is 920 DEG C -960 DEG C, second it is default when Between be 5h-8h.
- A kind of 8. quasi- differential temperature heat treatment method of large scale roll according to claim 1, it is characterised in that：Step 5）In Second stage temperature be 200 DEG C -300 DEG C, phase III temperature be less than or equal to 300 DEG C.
- A kind of 9. quasi- differential temperature heat treatment method of large scale roll according to claim 1, it is characterised in that：Step 5）In The first default wind pressure be 0.2MPa wind pressure.
- A kind of 10. quasi- differential temperature heat treatment method of large scale roll according to claim 1, it is characterised in that：Step 5） In the wind pressure of misting cooling be 0.4Mpa, hydraulic pressure 0.3MPa, spray time 50min-60min.
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| CN201711477829.0A CN107988479B (en) | 2017-12-29 | 2017-12-29 | Quasi-differential temperature heat treatment method for large-size roller |
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| CN201711477829.0A CN107988479B (en) | 2017-12-29 | 2017-12-29 | Quasi-differential temperature heat treatment method for large-size roller |
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| CN107988479B CN107988479B (en) | 2020-07-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112853195A (en) * | 2020-12-28 | 2021-05-28 | 中钢集团邢台机械轧辊有限公司 | Method for preparing hot continuous rolling and steckel mill ductile iron rough rolling working roll |
| CN114317930A (en) * | 2021-12-30 | 2022-04-12 | 秦皇岛华宇通电力科技有限公司 | Cylindrical part heat treatment device and heat treatment method thereof |
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| CN101760603A (en) * | 2010-01-08 | 2010-06-30 | 北京工业大学 | Manufacture method of composite milling roller with good roller surface rigidity uniformity |
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| CN106222392A (en) * | 2016-08-30 | 2016-12-14 | 江苏共昌轧辊股份有限公司 | A kind of integral quenching method of forging steel cold roll |
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2017
- 2017-12-29 CN CN201711477829.0A patent/CN107988479B/en active Active
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| JPH0466619A (en) * | 1990-07-05 | 1992-03-03 | Kubota Corp | Method for heat-treating conjugated high speed steel roll |
| CN101760603A (en) * | 2010-01-08 | 2010-06-30 | 北京工业大学 | Manufacture method of composite milling roller with good roller surface rigidity uniformity |
| CN102352431A (en) * | 2011-10-17 | 2012-02-15 | 中钢集团邢台机械轧辊有限公司 | Large-scale high-chrome cast iron roller permissible differential temperature heat treatment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112853195A (en) * | 2020-12-28 | 2021-05-28 | 中钢集团邢台机械轧辊有限公司 | Method for preparing hot continuous rolling and steckel mill ductile iron rough rolling working roll |
| CN112853195B (en) * | 2020-12-28 | 2022-09-27 | 中钢集团邢台机械轧辊有限公司 | Method for preparing hot continuous rolling and steckel mill ductile iron rough rolling working roll |
| CN114317930A (en) * | 2021-12-30 | 2022-04-12 | 秦皇岛华宇通电力科技有限公司 | Cylindrical part heat treatment device and heat treatment method thereof |
| CN114317930B (en) * | 2021-12-30 | 2023-12-15 | 秦皇岛华宇通电力科技有限公司 | Cylinder part heat treatment device and heat treatment method thereof |
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