CN106893812B - A kind of heat treatment method improving support roll hardness of roll body uniformity - Google Patents
A kind of heat treatment method improving support roll hardness of roll body uniformity Download PDFInfo
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- CN106893812B CN106893812B CN201611192568.3A CN201611192568A CN106893812B CN 106893812 B CN106893812 B CN 106893812B CN 201611192568 A CN201611192568 A CN 201611192568A CN 106893812 B CN106893812 B CN 106893812B
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- roll
- hardness
- heat treatment
- temperature
- backing roll
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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
- C21D1/18—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
- C21D1/68—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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
Abstract
The present invention relates to a kind of heat treatment method for improving support roll hardness of roll body uniformity, the heat treatment methods are as follows: backing roll is kept the temperature 5-15 hours under 200-300 DEG C of furnace temperature；Furnace temperature is risen to 450-550 DEG C with the heating rate less than or equal to 40 DEG C/h, and keeps the temperature 10-30 hours；Furnace temperature is down to 350-450 DEG C with the cooling rate less than or equal to 30 DEG C/h；Furnace temperature is down to 150 DEG C or less with the cooling rate less than or equal to 20 DEG C/h；It will take out in backing roll therefrom low-temp temper furnace, and be cooled to room temperature in air.Using heat treatment method of the invention, the requirement of backing roll hardness of roll body 60-78HSD, uniformity of hardness Δ HSD≤4 can satisfy, improve support roll quality level.
Description
Technical field
The present invention relates to the heat treatment method technical field for improving uniformity of hardness more particularly to a kind of bearings of raising forged steel
The heat treatment method of roller hardness of roll body uniformity.
Background technique
Important tool and expendable part of the backing roll as steel rolling equipment are filled along with the progress of steel rolling technology and steel rolling always
Standby update and continue to develop, performance directly determines the cost, performance and yield of rolled products.Cr5 swaged forging steel supporting roll closes
Gold content is higher, possesses superior hardenability, harden ability and good wearability and resistance to fracture, becomes strip mill bearing
The main product of roller.To produce high-performance backing roll, need by processes such as steel-making, forging, heat treatment, machinings, especially
It is the performance that heat treatment procedure directly determines backing roll.It includes heat treatment after forging, Tempering and Quenching that backing roll, which is heat-treated sequence,
And differential temperature heat treatment, wherein differential temperature heat treatment is to determine support roll operational layer tissue, hardness distribution, stress distribution and usability
It where the critical process of energy and the core of backing roll manufacturing technology, but is had the following problems in the sequence of differential temperature heat treatment at present: poor
After the completion of temperature heating, backing roll need to be hung to the cooling of fog quenching lathe, workpiece during turning is hung and be in air-cooled condition, edge effect
The heat dissipation of body of roll shoulder should be caused very fast, when misting cooling body of roll shoulder temperature (hardening heat) lower than in the middle part of the body of roll, so as to cause
Body of roll shoulder inevitably exists 100-250mm " soft band ", uniformity of hardness index Δ HSD≤5.
It is correspondingly also higher and higher to backing roll requirement with the continuous improvement that each steel mill requires plate form control, wherein
Hardness of roll body uniformity index significantly improves, some requirement Δs HSD≤3.The characteristics of being limited to equipment and differential temperature heat treatment, how to subtract
The influence of weak " soft band " to uniformity of hardness index becomes backing roll manufacturer urgent problem to be solved.This just needs to seek one kind
Suitable heat-treatment technology method controls the soft band of body of roll edge, to meet backing roll hardness of roll body uniformity index, promotes bearing
Roller quality level.
Summary of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of heat treatment for improving support roll hardness of roll body uniformity
Method, to solve the problems, such as that existing heat treatment method processing rear support roller uniformity of hardness is low.
The purpose of the present invention is mainly achieved through the following technical solutions:
A kind of heat treatment method improving support roll hardness of roll body uniformity, the raising support roll hardness of roll body
The heat treatment method of uniformity are as follows:
Step 1 installs temperature thermocouple on the backing roll body of roll to be processed；
Backing roll body of roll shoulder is carried out being deposited with package by step 2 using high temperature resistant asbestic blanket；
Step 3 hangs backing roll in the middle low-temp temper furnace with wind circulation, is tempered, the step further include:
Step 3.1 hangs backing roll in middle low-temp temper furnace；
Backing roll is kept the temperature 5-15 hours under 200-300 DEG C of furnace temperature by step 3.2；
Furnace temperature is risen to 450-550 DEG C with the heating rate less than or equal to 40 DEG C/h by step 3.3, and it is small to keep the temperature 10-30
When；
Furnace temperature is down to 350-450 DEG C with the cooling rate less than or equal to 30 DEG C/h by step 3.4；
Furnace temperature is down to 150 DEG C or less with the cooling rate less than or equal to 20 DEG C/h by step 3.5；
Step 3.6 will be taken out in backing roll therefrom low-temp temper furnace, and is cooled to room temperature in air；；
Step 4 is come out of the stove, and detection hardness of roll body carries out backing roll if being unsatisfactory for the technical requirements of backing roll again
Tempering, until meeting technical requirements.
Backing roll is Cr5 swaged forging steel making.
It is each in the middle part of the body of roll shoulder, the body of roll of backing roll to apply a temperature thermocouple in step 1, for monitoring subsequent branch
Runner temperature change.
In step 2, the width of the high temperature resistant asbestic blanket of backing roll body of roll shoulder package is greater than or equal to 300mm, and thickness is big
In or equal to 80mm.
In step 3, blower, the air flowing in blower drive in low-temp temper furnace, and shape are equipped in middle low-temp temper furnace
Become a common practice circulation.
In step 4, the distance for measuring the end surface of roll of the detection positional distance backing roll of the hardness of roll body of backing roll is
60mm-100mm。
Improve the applicable technical requirements of the heat treatment method of support roll hardness of roll body uniformity:
The hardness of roll body of backing roll is that 60-78HSD, uniformity of hardness Δ HSD are less than or equal to 4.
The present invention has the beneficial effect that:
(1) a kind of heat treatment method for improving support roll hardness of roll body uniformity provided by the invention, by roller
Body shoulder wraps up the processing mode of high temperature resistant asbestic blanket, so that body of roll shoulder temperature is lower than other positions, to make body of roll shoulder
" hardness drop " is lower than other positions, effectively improves hardness of roll body uniformity, meets user to the skill in terms of hardness of roll body uniformity
Art requirement；
(2) a kind of heat treatment method for improving support roll hardness of roll body uniformity provided by the invention, other each
Item performance indicator is tempered the backing roll after differential temperature is heat-treated under the premise of meeting technical requirements, eliminates to a certain extent
Residual stress in backing roll quench-hardened case, raising backing roll use resist accident；
(3) a kind of heat treatment method for improving support roll hardness of roll body uniformity provided by the invention, using thermometric
Thermocouple monitors the mode of workpiece temperature, so that body of roll quench-hardened case reaches assigned temperature and body of roll shoulder temperature is lower than other positions
It sets, soaking time is shorter, and process form is simple, and lower production costs are easily operated；
(4) a kind of heat treatment method for improving support roll hardness of roll body uniformity provided by the invention is to forged steel branch
The innovation of runner heat treatment process significantly improves backing roll quality level, promotes backing roll service performance, there is pole in this industry
Big popularizing value.
Other features and advantages of the present invention will illustrate in the following description, also, partial feature and advantage from
It is become apparent in specification, or understand through the implementation of the invention.The objectives and other advantages of the invention can by
Specifically noted structure is achieved and obtained in written specification, claims and attached drawing.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is a kind of temperature profile of heat treatment method for improving support roll hardness of roll body uniformity；
Fig. 2 is a kind of backing roll schematic diagram of heat treatment method processing for improving support roll hardness of roll body uniformity；
In figure: 1- backing roll, 2- high temperature resistant asbestic blanket.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention.
A kind of heat treatment method improving 1 hardness of roll body uniformity of support roll, 1 body of roll of raising support roll are hard
Spend the heat treatment method of uniformity are as follows:
Step 1 installs temperature thermocouple on 1 body of roll of backing roll to be processed；
1 body of roll shoulder of backing roll is carried out being deposited with package by step 2 using high temperature resistant asbestic blanket 2；
Step 3 hangs backing roll 1 in the middle low-temp temper furnace with wind circulation, is tempered；
Step 4 is come out of the stove, detect hardness of roll body, if being unsatisfactory for the technical requirements of backing roll, to backing roll 1 again into
Row tempering, until meeting technical requirements.
Backing roll 1 is Cr5 swaged forging steel making.
It is each in the middle part of the body of roll shoulder, the body of roll of backing roll 1 to apply a temperature thermocouple in step 1, for monitoring subsequent branch
1 temperature change of runner.
As shown in Fig. 2, the width of the high temperature resistant asbestic blanket 2 of 1 body of roll shoulder of backing roll package is greater than or equal in step 2
300mm, thickness are greater than or equal to 80mm.
As shown in Figure 1, the specific steps of step 3 are as follows:
Step 3.1 hangs backing roll 1 in middle low-temp temper furnace；
Backing roll 1 is kept the temperature 5-15 hours under 200-300 DEG C of furnace temperature by step 3.2；
Furnace temperature is risen to 450-550 DEG C with the heating rate less than or equal to 40 DEG C/h by step 3.3, and it is small to keep the temperature 10-30
When；
Furnace temperature is down to 350-450 DEG C with the cooling rate less than or equal to 30 DEG C/h by step 3.4；
Furnace temperature is down to 150 DEG C or less with the cooling rate less than or equal to 20 DEG C/h by step 3.5；
Step 3.6 will be taken out in backing roll 1 therefrom low-temp temper furnace, and is cooled to room temperature in air.
In step 4, the distance for measuring the end surface of roll of the detection positional distance backing roll 1 of the hardness of roll body of backing roll 1 is
60mm-100mm。
Improve the applicable technical requirements of the heat treatment method of 1 hardness of roll body uniformity of support roll:
The hardness of roll body of backing roll 1 is that 60-78HSD, uniformity of hardness Δ HSD are less than or equal to 4.
Using method processing of the invention for the high support roll on strip mill, material is Cr5 forged steel, main
Chemical component is as follows:
Embodiment 1
The cold acid of certain steel mill rolls backing roll, and backing roll size and main technical requirements are as follows:
Existing differential temperature heat treatment is carried out to above-mentioned backing roll, Hardness results are as follows:
According to above-mentioned requirements, hardness of roll body uniformity need to be improved to meet technical requirements, specific heat treatment process mistake
Journey is as follows:
1) each first in the middle part of backing roll body of roll shoulder, the body of roll to apply a temperature thermocouple (totally 2), monitor backing roll work
Temperature conditions in part heat treatment process.
2) as shown in Fig. 2, being deposited with the high temperature resistant asbestic blanket of Jacket thickness 80mm, width 350mm, main mesh in body of roll shoulder
Reduction body of roll shoulder heating rate, make body of roll shoulder temperature lower than other positions.
3) backing roll wrapped is hung and is heat-treated in the middle low-temp temper furnace with wind circulation, specific steps
Are as follows: 13h is kept at 230 ± 10 DEG C of furnace temperature, then with the speed kindling temperature of≤40 DEG C/h to 520 ± 10 DEG C, at this time in the body of roll
Even 330 DEG C, 240 DEG C of shoulder of the temperature in portion；It is even 515 DEG C, 480 DEG C of shoulder warm in the middle part of the body of roll at this time in 520 ± 10 DEG C of holding 25h；Then
Reduce furnace temperature to 400 DEG C with the cooling velocity of≤30 DEG C/h, furnace temperature is reduced to 150 DEG C with slower speed≤20 DEG C/h hereinafter,
Avoid the generation of second residual stresses；Workpiece is come out of the stove air-cooled.
4) roller to be supported detects hardness after being cooled to room temperature, and body of roll edge check bit is set away from end surface of roll distance 80mm,
Hardness of roll body testing result is as follows:
5) Hardness results and technical requirements before backing roll supplement tempering are compared, hardness of roll body uniformity has bright
It is aobvious to improve, and meet technical requirements.
Embodiment 2
The zinc-plated backing roll of certain steel mill, backing roll size and main technical requirements are as follows:
Existing differential temperature heat treatment is carried out to above-mentioned backing roll, Hardness results are as follows:
According to above-mentioned requirements, hardness of roll body uniformity need to be improved to meet technical requirements, specific heat treatment process mistake
Journey is as follows:
1) each above and below backing roll body of roll shoulder, in the middle part of the body of roll first to apply a temperature thermocouple (totally 2), monitoring bearing
Temperature conditions during roller heat treatment of workpieces.
2) as shown in Fig. 2, being deposited with the high temperature resistant asbestic blanket of Jacket thickness 100mm, width 300mm in body of roll shoulder；Mainly
Purpose reduces the heating rate of body of roll shoulder, makes body of roll shoulder temperature lower than other positions.
3) backing roll wrapped is hung and is heat-treated in the middle low-temp temper furnace with wind circulation, specific steps
Are as follows: 8h is kept at 220 ± 10 DEG C of furnace temperature, then with the speed kindling temperature of≤40 DEG C/h to 490 ± 10 DEG C, at this time in the middle part of the body of roll
Even 300 DEG C, 230 DEG C of shoulder of temperature；It is even 470 DEG C, 440 DEG C of shoulder warm in the middle part of the body of roll at this time in 490 ± 10 DEG C of holding 15h；Then with
The cooling velocity of≤30 DEG C/h reduces furnace temperature to 400 DEG C, reduces furnace temperature to 150 DEG C hereinafter, keeping away with slower speed≤20 DEG C/h
Exempt from the generation of second residual stresses；Workpiece is come out of the stove air-cooled.
4) roller to be supported detects hardness after being cooled to room temperature, and body of roll edge check bit is set away from end surface of roll distance 60mm,
Hardness of roll body testing result is as follows:
5) Hardness results and technical requirements before backing roll supplement tempering are compared, hardness of roll body uniformity has bright
It is aobvious to improve, and meet technical requirements.
It can be seen that by examples detailed above, using heat treatment method of the invention, can satisfy backing roll hardness of roll body 60-
The requirement of 78HSD, uniformity of hardness Δ HSD≤4 improve support roll quality level.
In conclusion the embodiment of the invention provides the heat treatment method for improving support roll hardness of roll body uniformity,
By the way of being deposited with package high temperature resistant asbestic blanket to body of roll shoulder, the backing roll after differential temperature heat treatment is tempered, effectively
The soft band of body of roll edge is controlled, hardness of roll body uniformity significantly improves, and improves backing roll quality level.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of heat treatment method for improving support roll hardness of roll body uniformity, which is characterized in that raising forged steel bearing
The heat treatment method of roller hardness of roll body uniformity are as follows:
Step 1 installs temperature thermocouple on the backing roll body of roll to be processed；
Backing roll body of roll shoulder is carried out being deposited with package by step 2 using high temperature resistant asbestic blanket；
Step 3 hangs backing roll in the middle low-temp temper furnace with wind circulation, is tempered, the step further include:
Step 3.1 hangs backing roll in middle low-temp temper furnace；
Backing roll is kept the temperature 5-15 hours under 200-300 DEG C of furnace temperature by step 3.2；
Furnace temperature is risen to 450-550 DEG C with the heating rate less than or equal to 40 DEG C/h, and keeps the temperature 10-30 hours by step 3.3；
Furnace temperature is down to 350-450 DEG C with the cooling rate less than or equal to 30 DEG C/h by step 3.4；
Furnace temperature is down to 150 DEG C or less with the cooling rate less than or equal to 20 DEG C/h by step 3.5；
Step 3.6 will be taken out in backing roll therefrom low-temp temper furnace, and is cooled to room temperature in air；
Step 4 is come out of the stove, and detection hardness of roll body returns backing roll if being unsatisfactory for the technical requirements of backing roll again
Fire, until meeting technical requirements.
2. the heat treatment method according to claim 1 for improving support roll hardness of roll body uniformity, which is characterized in that
The backing roll is Cr5 swaged forging steel making.
3. the heat treatment method according to claim 1 for improving support roll hardness of roll body uniformity, which is characterized in that
It is each in the middle part of the body of roll shoulder, the body of roll of the backing roll to apply a temperature thermocouple in the step 1, for monitoring subsequent branch
Runner temperature change.
4. the heat treatment method according to claim 1 for improving support roll hardness of roll body uniformity, which is characterized in that
In the step 2, the width of the high temperature resistant asbestic blanket of backing roll body of roll shoulder package is greater than or equal to 300mm, and thickness is big
In or equal to 80mm.
5. the heat treatment method according to claim 1 for improving support roll hardness of roll body uniformity, which is characterized in that
In the step 4, the distance of the end surface of roll of backing roll described in the detection positional distance of the hardness of roll body of the backing roll is measured
For 60mm-100mm.
6. the heat treatment method according to any one of claims 1 to 5 for improving support roll hardness of roll body uniformity, special
Sign is, the applicable technical requirements of the heat treatment method for improving support roll hardness of roll body uniformity:
The hardness of roll body of backing roll is that 60-78HSD, uniformity of hardness Δ HSD are less than or equal to 4.
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| 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 |
| CN111139351B (en) * | 2019-12-26 | 2022-06-17 | 中钢集团邢台机械轧辊有限公司 | Process method for differential temperature heat treatment of forged steel BD roller |
| CN117051333B (en) * | 2023-10-12 | 2024-01-23 | 山西同航特钢有限公司 | Forged steel supporting roller and preparation method thereof |
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| JPS62290827A (en) * | 1986-06-06 | 1987-12-17 | Kobe Steel Ltd | Heat treatment of rolling roll |
| JP4410143B2 (en) * | 2005-04-22 | 2010-02-03 | 日鉄住金ロールズ株式会社 | Heat treatment method for rolling composite rolls |
| CN103572033A (en) * | 2012-08-07 | 2014-02-12 | 上海重型机器厂有限公司 | Thermal treatment method of wide and thick plate supporting roll |
| CN103667665A (en) * | 2013-12-06 | 2014-03-26 | 天津重型装备工程研究有限公司 | Differential temperature thermal processing method for high-chromium cast steel centrifugation composite working roll |
| CN104087742A (en) * | 2014-06-24 | 2014-10-08 | 河北钢铁股份有限公司唐山分公司 | Differential temperature heat treatment method for centrifugal compound high-chromium steel roller |
| CN105200223A (en) * | 2015-08-25 | 2015-12-30 | 宝钢轧辊科技有限责任公司 | Large forged steel supporting roller heat treatment method |
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| JPS62290827A (en) * | 1986-06-06 | 1987-12-17 | Kobe Steel Ltd | Heat treatment of rolling roll |
| JP4410143B2 (en) * | 2005-04-22 | 2010-02-03 | 日鉄住金ロールズ株式会社 | Heat treatment method for rolling composite rolls |
| CN103572033A (en) * | 2012-08-07 | 2014-02-12 | 上海重型机器厂有限公司 | Thermal treatment method of wide and thick plate supporting roll |
| CN103667665A (en) * | 2013-12-06 | 2014-03-26 | 天津重型装备工程研究有限公司 | Differential temperature thermal processing method for high-chromium cast steel centrifugation composite working roll |
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