CN108611469A - A kind of heat treatment method of support roll - Google Patents
A kind of heat treatment method of support roll Download PDFInfo
- Publication number
- CN108611469A CN108611469A CN201810759072.2A CN201810759072A CN108611469A CN 108611469 A CN108611469 A CN 108611469A CN 201810759072 A CN201810759072 A CN 201810759072A CN 108611469 A CN108611469 A CN 108611469A
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- Prior art keywords
- support roll
- warming
- roll
- cooled
- temperature
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Classifications
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- 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
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
-
- 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
-
- 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
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
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- 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)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of heat treatment methods of support roll comprising normalizing, spheroidizing, differential quenching and tempering step after forging；The spheroidizing step is：Support roll keeps the temperature 1.2~1.6h/100mm at 300~400 DEG C, is warming up to 650~750 DEG C of 0.4~0.8h/100mm of heat preservation, then is warming up to 750~850 DEG C of 3.5~4.5h/100mm of heat preservation, be furnace-cooled to 400 DEG C again banking be cooled to≤150 DEG C and come out of the stove；The differential quenching step is：Support roll keeps the temperature 0.5~1.0h/100mm at 250~350 DEG C；It is rapidly heated, maximum heating temperature >=980 DEG C keep the temperature 0.4~0.6h/100mm, misting cooling of coming out of the stove at 900~960 DEG C.This method does not have Dehydrogenation Annealing Process, eliminates quenched process, passes through primary quenching and tempering, so that it may to meet the body of roll, roll neck different hardness requirement；The backing roll property indices of production are all improved；Hardened depth >=95mm, therefore the service life of roll improves 18%；Uniformity of hardness is higher, and anti-fatigue performance increases；Roll does not have soft band, end resistance to flaking to increase.
Description
Technical field
The present invention relates to a kind of alloy heat treatment method, especially a kind of heat treatment method of support roll.
Background technology
Currently, the domestic main heat treatment method of support roll has following two kinds：
（1）Normalizing+spheroidizing+dehydrogenation-Tempering and Quenching after forging（Quenching oil cools down）- body of roll differential quenching+tempering.
The advantages of heat treatment method is that quench-hardened case is deeper, and roll neck hardness is easy to control.The disadvantage is that：The quenching of combustion gas differential temperature stove is easy to cause
The part burning of the support roller body of roll or temperature are too low, lead to the body of roll locally soft or hard point, hardness of roll body uniformity is poor, influences wearability
And resistance to flaking；The heat treatment twice of body of roll roll neck experience is easy to generate stress concentration in body of roll roll neck intersection, makes support roller
Anti- fractureing property substantially reduces；The process cycle of this heat treatment method is 37 days or so, and the manufacturing cycle is long, and cost is higher, simultaneously
It is polluted the environment using quenching oil is quenched, does not meet national green manufacture slogan.
（2）Normalizing+spheroidizing+dehydrogenation-Tempering and Quenching after forging（Quenching oil cools down）- body of roll impewdance matching+
Tempering.The advantages of heat treatment method is that the body of roll, roll neck uniformity of hardness are preferable, and wearability is preferable.The disadvantage is that：Impewdance matching is quenched
Hard formation is shallow, and hardness reduces comparatively fast, and antistrip performance is poor；There are starting point warms for impewdance matching, and there are soft bands to increase situation,
Support roller easy tos produce de- shoulder in use, seriously affects resistance to flaking；The process cycle of this heat treatment method is 35
It or so, the manufacturing cycle is long, and cost is higher, while being polluted the environment using quenching oil is quenched, does not meet national green system
Stoma number.
Invention content
A kind of heat of the technical problem to be solved in the present invention is to provide uniformity of hardness support roll higher, at low cost
Processing method.
In order to solve the above technical problems, the technical solution used in the present invention is：It include forging after normalizing, spheroidizing,
Differential quenching and tempering step；
The spheroidizing step is：Support roll keeps the temperature 1.2~1.6h/100mm at 300~400 DEG C, it is warming up to 650~
750 DEG C of 0.4~0.8h/100mm of heat preservation, then 750~850 DEG C of 3.5~4.5h/100mm of heat preservation are warming up to, it is furnace-cooled to 380~400
Banking is cooled to≤150 DEG C and comes out of the stove DEG C again；
The differential quenching step is：Support roll keeps the temperature 0.5~1.0h/100mm at 250~350 DEG C；It is rapidly heated, most
High heating temperature >=980 DEG C keep the temperature 0.4~0.6h/100mm, misting cooling of coming out of the stove at 900~960 DEG C.
In spheroidizing step of the present invention, support roll is warming up to 650~750 DEG C with the speed of≤30 DEG C/h,
It is warming up to 750~850 DEG C with the speed of≤50 DEG C/h.
Normalising step is after forging of the present invention：Support roll keeps the temperature 0.5~1h/100mm, furnace cooling at 550~650 DEG C
To 300~400 DEG C of 0.8~1.2h/100mm of heat preservation, 600~700 DEG C of 0.4~0.8h/100mm of heat preservation are warming up to, then be warming up to
850~950 DEG C heat preservation 1.8~2.5h/100mm, be finally air-cooled to 400~450 DEG C again banking it is cold.Normalising step after the forging
In, support roll is warming up to 600~700 DEG C with the speed of≤30 DEG C/h, and 850~950 are warming up to the speed of≤50 DEG C/h
℃。
Tempering step of the present invention is：Support roll keeps the temperature 0.9~1.2h/100mm at 250~350 DEG C, is warming up to
450~550 DEG C of 3.5~4.0h/100mm of heat preservation；Then 400~450 DEG C are cooled to, then is cooled to≤150 DEG C and comes out of the stove.Described time
In fiery step, support roll is warming up to 450~550 DEG C with the speed of≤30 DEG C/h, and 400 are cooled to the speed of≤20 DEG C/h
~450 DEG C ,≤150 DEG C are cooled to the speed of≤10 DEG C/h.
It is using advantageous effect caused by above-mentioned technical proposal：Heat treatment after forging of the present invention does not have dehydrogenation work
Skill eliminates quenched process, passes through primary quenching and tempering, so that it may to meet the body of roll, roll neck different hardness requirement；The branch of production
Runner property indices are all improved；Hardened depth >=95mm, therefore the service life of roll improves 18%；Uniformity of hardness
Higher, anti-fatigue performance increases；Roll does not have soft band, end resistance to flaking to increase.It is cost-effective that the present invention removes quenched process
900~1100 yuan/ton of steel, total heat treatment duration are 22 days or so, save manufacturing schedule 15 days or so.The present invention is heat-treated skill
It does not take quenching oil quenched, reduces the pollution to environment, responded the slogan of national green manufacture.
Specific implementation mode
The present invention will be further described in detail with reference to the specific embodiments.
Embodiment 1-8：The heat treatment method of this support roll is poor using normalizing+spheroidizing-entirety electric furnace after forging
Warm quenching+tempering technique, it is described that respectively steps are as follows.
（1）Normalising step after forging：Support roll is kept the temperature through four normalizings, and detailed process is：Support roll 550~
650 DEG C keep the temperature 0.5~1h/100mm for the first time；It is furnace-cooled to 300~400 DEG C of second of 0.8~1.2h/100mm of heat preservation；With≤30
DEG C/h be warming up to 600~700 DEG C third time heat preservation 0.4~0.8h/100mm；Again 850~950 DEG C is warming up to≤50 DEG C/h
Four 1.8~2.5h/100mm of heat preservation；Finally be air-cooled to 400~450 DEG C again banking it is cold.Normalizing is joined after each embodiment is specifically forged
Number is shown in Table 1.
Table 1：Normalizing parameter after each embodiment is specifically forged
（2）Spheroidizing step：Through keeping the temperature three times, detailed process is support roll：Support roll is at 300~400 DEG C
1.2~1.6h/100mm of primary heat preservation is warming up to 650~750 DEG C of second of 0.4~0.8h/100mm of heat preservation with≤30 DEG C/h,
750~850 DEG C of third time 3.5~4.5h/100mm of heat preservation are warming up to≤50 DEG C/h again, are furnace-cooled to 380~400 DEG C of banking again
It is cooled to≤150 DEG C to come out of the stove.Each specific spheroidizing parameter of embodiment is shown in Table 2.
Table 2：Each specific spheroidizing parameter of embodiment
（3）Differential quenching step：Support roll is through secondary heat preservation, detailed process：Support roll is at 250~350 DEG C
0.5~1.0h/100mm of primary heat preservation；It is rapidly heated, heating rate is preferably 100~150 DEG C/h, maximum heating temperature >=980
DEG C, in 900~960 DEG C of second of 0.4~0.6h/100mm of heat preservation, misting cooling of coming out of the stove.Each specific differential quenching of embodiment
Parameter is shown in Table 3.
Table 3：Each specific differential quenching parameter of embodiment
（4）Tempering step is：Support roll is through secondary heat preservation+reducing temperature twice, detailed process：Support roll 250~
350 DEG C keep the temperature 0.9~1.2h/100mm for the first time, and 450~550 DEG C of second of 3.5~4.0h/ of heat preservation are warming up to≤30 DEG C/h
100mm is cooled to 400~450 DEG C for the first time with≤20 DEG C/h, then is cooled to≤150 DEG C for the second time with≤10 DEG C/h and comes out of the stove.Respectively
The specific tempering parameter of embodiment is shown in Table 4.
Table 4：Each specific tempering parameter of embodiment
（5）The mechanical property of support roll obtained by each embodiment is shown in Table 5, and fatigue data is shown in Table 6.
Table 5：The mechanical property of support roll obtained by each embodiment
Table 6：Fatigue data
Claims (6)
1. a kind of heat treatment method of support roll, it is characterised in that：It includes normalizing, spheroidizing, differential quenching after forging
And tempering step；
The spheroidizing step is：Support roll keeps the temperature 1.2~1.6h/100mm at 300~400 DEG C, it is warming up to 650~
750 DEG C of 0.4~0.8h/100mm of heat preservation, then 750~850 DEG C of 3.5~4.5h/100mm of heat preservation are warming up to, it is furnace-cooled to 380~400
Banking is cooled to≤150 DEG C and comes out of the stove DEG C again；
The differential quenching step is：Support roll keeps the temperature 0.5~1.0h/100mm at 250~350 DEG C；It is rapidly heated, most
High heating temperature >=980 DEG C keep the temperature 0.4~0.6h/100mm, misting cooling of coming out of the stove at 900~960 DEG C.
2. a kind of heat treatment method of support roll according to claim 1, it is characterised in that：The spheroidizing step
In rapid, support roll is warming up to 650~750 DEG C with the speed of≤30 DEG C/h, 750 are warming up to the speed of≤50 DEG C/h~
850℃。
3. a kind of heat treatment method of support roll according to claim 1, which is characterized in that normalizing walks after the forging
Suddenly it is：Support roll keeps the temperature 0.5~1h/100mm at 550~650 DEG C, is furnace-cooled to 300~400 DEG C of 0.8~1.2h/ of heat preservation
100mm is warming up to 600~700 DEG C of 0.4~0.8h/100mm of heat preservation, then is warming up to 850~950 DEG C of 1.8~2.5h/ of heat preservation
100mm, be finally air-cooled to 400~450 DEG C again banking it is cold.
4. a kind of heat treatment method of support roll according to claim 3, it is characterised in that：Normalizing walks after the forging
In rapid, support roll is warming up to 600~700 DEG C with the speed of≤30 DEG C/h, 850 are warming up to the speed of≤50 DEG C/h~
950℃。
5. a kind of heat treatment method of support roll according to any one of claims 1-4, which is characterized in that institute
Stating tempering step is：Support roll keeps the temperature 0.9~1.2h/100mm at 250~350 DEG C, is warming up to 450~550 DEG C of heat preservations
3.5~4.0h/100mm；Then 400~450 DEG C are cooled to, then is cooled to≤150 DEG C and comes out of the stove.
6. a kind of heat treatment method of support roll according to claim 5, it is characterised in that：The tempering step
In, support roll is warming up to 450~550 DEG C with the speed of≤30 DEG C/h, and 400~450 are cooled to the speed of≤20 DEG C/h
DEG C, it is cooled to≤150 DEG C with the speed of≤10 DEG C/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810759072.2A CN108611469A (en) | 2018-07-11 | 2018-07-11 | A kind of heat treatment method of support roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810759072.2A CN108611469A (en) | 2018-07-11 | 2018-07-11 | A kind of heat treatment method of support roll |
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| Publication Number | Publication Date |
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| CN108611469A true CN108611469A (en) | 2018-10-02 |
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| CN201810759072.2A Withdrawn CN108611469A (en) | 2018-07-11 | 2018-07-11 | A kind of heat treatment method of support roll |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109439863A (en) * | 2018-12-29 | 2019-03-08 | 中国第重型机械股份公司 | A kind of heating process method changing the soft band of backing roll |
| CN113774198A (en) * | 2021-09-10 | 2021-12-10 | 贵州群建精密机械有限公司 | Heat treatment method for improving elastic fatigue limit of carbon steel |
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| CN101698902A (en) * | 2009-11-11 | 2010-04-28 | 江苏共昌轧辊有限公司 | Quenching method for integral cast steel supporting roll |
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-
2018
- 2018-07-11 CN CN201810759072.2A patent/CN108611469A/en not_active Withdrawn
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109439863A (en) * | 2018-12-29 | 2019-03-08 | 中国第重型机械股份公司 | A kind of heating process method changing the soft band of backing roll |
| CN109439863B (en) * | 2018-12-29 | 2020-01-14 | 中国第一重型机械股份公司 | Heating process method for changing supporting roller soft belt |
| CN113774198A (en) * | 2021-09-10 | 2021-12-10 | 贵州群建精密机械有限公司 | Heat treatment method for improving elastic fatigue limit of carbon steel |
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