CN114774643A - Improved heat treatment method for M42 material full-hardened working roll - Google Patents
Improved heat treatment method for M42 material full-hardened working roll Download PDFInfo
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- CN114774643A CN114774643A CN202210508813.6A CN202210508813A CN114774643A CN 114774643 A CN114774643 A CN 114774643A CN 202210508813 A CN202210508813 A CN 202210508813A CN 114774643 A CN114774643 A CN 114774643A
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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
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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
- C21D11/00—Process control or regulation for heat treatments
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/04—Hardening by cooling below 0 degrees Celsius
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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
- 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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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention relates to the technical field of heat treatment, and provides an improved heat treatment method of a full-hardened work roll made of M42 material, which is characterized by comprising the following steps: the quenching comprises high-temperature heating and deep cooling quenching which are sequentially carried out; the high-temperature heating temperature is 1190-1195 ℃, and the heat preservation time is 1-2 hours; the deep cooling quenching comprises the steps of quenching at a temperature of between 50 ℃ below zero and 60 ℃ below zero for 100 to 120 min; 140 to 150 ℃ below zero for 100 to 120 min; the temperature is between 190 ℃ below zero and 195 ℃ below zero, and the time is 180 min to 200 min. The invention overcomes the defects of the prior art, has reasonable process design, and solves the technical problem that the integral hardness of the existing M42 fully hardened working roll needs to be further improved.
Description
Technical Field
The invention relates to the technical field of heat treatment, in particular to an improved heat treatment method for a full-hardened work roll made of M42 material.
Background
With the increasing quality requirements of stainless steel plate strips and copper strips, cold rolled products have the characteristics of high dimensional precision, good surface finish, adjustable surface roughness and the like when being rolled at normal temperature. Because of this, the cold rolling production has very high requirements for the roller, and requires higher hardness, excellent wear resistance and better toughness. In particular, in the cold rolling production process of stainless steel, the requirements on the roller (especially the working roller) are higher, compared with carbon steel, the stainless steel has higher deformation resistance (almost twice as high as the carbon steel at most), and the unit rolling pressure of the roller in a rolling deformation area is very high, so that the roller is required to have high hardness and bending resistance; meanwhile, the surface quality requirement of stainless steel is very high, obvious defects are not allowed under the normal condition, even slight color difference exists, so that the roller is required to have good wear resistance, and the surface finish quality cannot be reduced quickly in the rolling process. However, the existing working roll can not meet the requirements, the wear resistance is poor, the service life is short, the roll needs to be frequently repaired, the surface hardness and the smoothness are poor, and the surface of the plate is not smooth, the color difference is large, and the color is uneven.
The invention patent with publication number CN112981084A discloses a heat treatment method of a full-hardened work roll, in particular to a heat treatment method of a full-hardened work roll made of M42 material, the hardness of the surface and the core of the work roll is consistent, the hardness after heat treatment reaches HRC 65-66, namely the depth of a hardening layer of the roll can reach 100 percent, the product quality can be improved, the plate surface quality can be controlled, the quality chromatic aberration of the plate surface can be reduced, the use effect is very good, the wear resistance is superior to that of a common commercial work roll, the smooth surface can be rolled, the service life is longer, and the method can be used for producing stainless steel and copper strips.
How to further improve the overall hardness of the M42 fully hardened work roll is always the research and development direction of the inventor, and therefore, an improved heat treatment method of the M42 fully hardened work roll is provided.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an improved heat treatment method of a full-hardened work roll made of M42 material, overcomes the defects of the prior art, has reasonable process design, and solves the technical problem that the overall hardness of the full-hardened work roll made of M42 material needs to be further improved.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
an improved heat treatment method for a full-hardened work roll made of M42 material is characterized by comprising the following steps of quenching, low-temperature tempering and high-temperature tempering, and is characterized in that:
the quenching comprises high-temperature heating and deep cooling quenching which are sequentially carried out; the high-temperature heating temperature is 1190-1195 ℃, and the heat preservation time is 1-2 hours; the deep cooling quenching comprises the steps of quenching at a temperature of between 50 ℃ below zero and 60 ℃ below zero for 100 to 120 min; the temperature is-140 to-150 ℃, and the time is 100 to 120 min; the temperature is between 190 ℃ below zero and 195 ℃ below zero, and the time is 180 to 200 min; the low-temperature tempering comprises primary low-temperature tempering and secondary low-temperature tempering, wherein the primary low-temperature tempering and the secondary low-temperature tempering are both 160-180 ℃, and the heat preservation time is 3-5 hours;
the high-temperature tempering comprises primary high-temperature tempering, secondary high-temperature tempering, tertiary high-temperature tempering and quartic high-temperature tempering which are sequentially carried out; the temperature of the primary high-temperature tempering and the temperature of the secondary high-temperature tempering are both 460-480 ℃, and the heat preservation time is both 2-3 hours; the temperature of the third high-temperature tempering and the fourth high-temperature tempering is 500-520 ℃, and the heat preservation time is 2-3 hours.
Further, the quenching also comprises a quenching preheating step arranged before high-temperature heating, wherein the quenching preheating step comprises primary constant-temperature preheating, secondary constant-temperature preheating and tertiary constant-temperature preheating which are sequentially carried out; the temperature of primary constant-temperature preheating is 380-420 ℃, and the heat preservation time is 5-7 hours; the temperature of the secondary constant-temperature preheating is 580-620 ℃, and the heat preservation time is 3-5 hours; the temperature of the third constant-temperature preheating is 780-820 ℃, and the heat preservation time is 2-4 hours.
Further, primary air cooling is arranged after primary low-temperature tempering, the primary air cooling is carried out to 50-60 ℃, a secondary air cooling step is arranged after secondary low-temperature tempering, and the air cooling is carried out to the room temperature.
Further, after primary high-temperature tempering, secondary high-temperature tempering, tertiary high-temperature tempering and quartic high-temperature tempering, an air cooling step is respectively arranged, and the air cooling is carried out to the room temperature.
Furthermore, a tempering preheating step is arranged before the primary high-temperature tempering, the tempering preheating temperature is 280-320 ℃, and the heat preservation time is 3-5 hours.
Further, after the deep-cooling quenching, the temperature is returned to the room temperature and then the low-temperature tempering is carried out.
(III) advantageous effects
The embodiment of the invention provides an improved heat treatment method, which has the following beneficial effects: the quenching step in the heat treatment process is adjusted and optimized, specifically, a deep-cooling quenching mode of-190 to-195 ℃ is adopted, and the temperature and time of each stage of quenching are correspondingly adjusted, so that the final hardness of the material is improved by 0.8-1.2 HRC, and meanwhile, the wear resistance is greatly improved; on the basis, the heat preservation temperature of high-temperature heating is increased to 1190-1195 ℃, and the toughness and the wear resistance of the material are improved; in addition, the wear resistance of the material is reduced at the original high-temperature tempering temperature, and the wear resistance of the material is synchronously improved by adjusting and reducing the tempering temperature.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
An improved heat treatment method for a full-hardened work roll made of M42 material comprises the following steps of quenching, low-temperature tempering and high-temperature tempering which are sequentially carried out.
Quenching:
s1, primary constant-temperature preheating is carried out, the temperature is 380-420 ℃, and the heat preservation time is 5-7 hours;
s2, carrying out secondary constant-temperature preheating at 580-620 ℃ for 3-5 hours;
and S3, the temperature of the three constant temperature preheats is 780-820 ℃, and the heat preservation time is 2-4 hours.
S4, heating at a high temperature of 1190-1195 ℃, and keeping the temperature for 1-2 hours;
s5, carrying out primary quenching at-50 to-60 ℃ for 100 to 120 min;
s6, carrying out secondary quenching at-140 to-150 ℃ for 100-120 min;
s7, quenching for three times, wherein the temperature is-190 to-195 ℃ and 180 to 200 min;
low-temperature tempering:
s1, carrying out primary low-temperature tempering, wherein the temperature of the primary low-temperature tempering and the temperature of the secondary low-temperature tempering are both 160-180 ℃, and the heat preservation time is 3-5 hours;
s2, performing primary air cooling to 50-60 ℃;
s3, secondary low-temperature tempering, wherein the temperature of the secondary low-temperature tempering is 160-180 ℃, and the heat preservation time is 3-5 hours;
and S4, secondary air cooling, and air cooling to room temperature.
High-temperature tempering:
s1, tempering and preheating, wherein the temperature is 280-320 ℃, and the heat preservation time is 3-5 hours;
s2, carrying out primary high-temperature tempering at 460-480 ℃, and keeping the temperature for 2-3 hours;
s3, primary air cooling, and air cooling to room temperature;
s4, performing secondary high-temperature tempering at 460-480 ℃, and keeping the temperature for 2-3 hours;
s5, secondary air cooling, and air cooling to room temperature;
s6, carrying out tertiary high-temperature tempering at 500-520 ℃, and keeping the temperature for 2-3 hours;
s7, air cooling for three times, and air cooling to room temperature;
s8, performing four times of high-temperature tempering at 500-520 ℃, and keeping the temperature for 2-3 hours.
And S9, air cooling for four times, and air cooling to room temperature.
The process parameters and product hardness data for examples 1-5 are shown in the following table.
The high temperature tempering steps S3, S5, and S7 are all cooled to room temperature, which are not shown in the table.
In addition, the wearability of the working roll of above-mentioned embodiment also obtains promoting by a wide margin, and through the customer uses the feedback, compares in the working roll of original patent technology production, and current working roll life has promoted 500 ~ 600%.
The sample roller is a commercial M42 cylindrical blank and is obtained by rough machining, the diameter of the roller body is 90mm, the length of the roller body is 810mm, and the diameter of the shaft necks at the two ends is 65mm and the length of the shaft necks at the two ends is 117 mm.
It should be noted that, the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. An improved heat treatment method for a full-hardened work roll made of M42 material is characterized by comprising the following steps of quenching, low-temperature tempering and high-temperature tempering, and is characterized in that:
the quenching comprises high-temperature heating and deep cooling quenching which are sequentially carried out; the high-temperature heating temperature is 1190-1195 ℃, and the heat preservation time is 1-2 hours; carrying out deep cooling quenching at the temperature of-50 to-60 ℃ for 100 to 120 min; 140 to 150 ℃ below zero for 100 to 120 min; the temperature is between 190 ℃ below zero and 195 ℃ below zero for 180 to 200 min;
the low-temperature tempering comprises primary low-temperature tempering and secondary low-temperature tempering, wherein the primary low-temperature tempering and the secondary low-temperature tempering are both 160-180 ℃, and the heat preservation time is 3-5 hours;
the high-temperature tempering comprises primary high-temperature tempering, secondary high-temperature tempering, tertiary high-temperature tempering and quartic high-temperature tempering which are sequentially carried out; the temperature of the primary high-temperature tempering and the temperature of the secondary high-temperature tempering are both 460-480 ℃, and the heat preservation time is both 2-3 hours; the temperature of the third high-temperature tempering and the fourth high-temperature tempering is 500-520 ℃, and the heat preservation time is 2-3 hours.
2. The improved heat treatment method for the M42 fully hardened work roll according to claim 1, wherein the quenching further comprises a quenching preheating step before high temperature heating, and the quenching preheating comprises a primary constant temperature preheating step, a secondary constant temperature preheating step and a tertiary constant temperature preheating step which are sequentially carried out; the temperature of primary constant-temperature preheating is 380-420 ℃, and the heat preservation time is 5-7 hours; the temperature of the secondary constant-temperature preheating is 580-620 ℃, and the heat preservation time is 3-5 hours; the temperature of the third constant-temperature preheating is 780-820 ℃, and the heat preservation time is 2-4 hours.
3. The improved heat treatment method for M42 through hardened work rolls, according to claim 1, wherein the first low temperature tempering is followed by a first air cooling step, the first air cooling step is followed by a second air cooling step, and the second air cooling step is followed by a second low temperature tempering step, the second air cooling step is followed by a second air cooling step, and the second air cooling step is followed by a second low temperature tempering step.
4. The improved heat treatment method for M42 full-hardened work rolls, according to claim 1, wherein the first high temperature tempering, the second high temperature tempering, the third high temperature tempering and the fourth high temperature tempering are respectively followed by an air cooling step to cool the work rolls to room temperature.
5. The improved heat treatment method for the M42 through hardened work roll according to claim 4, wherein a tempering preheating step is provided before the primary high temperature tempering, the tempering preheating temperature is 280-320 ℃, and the holding time is 3-5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210508813.6A CN114774643A (en) | 2022-05-10 | 2022-05-10 | Improved heat treatment method for M42 material full-hardened working roll |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210508813.6A CN114774643A (en) | 2022-05-10 | 2022-05-10 | Improved heat treatment method for M42 material full-hardened working roll |
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| CN114774643A true CN114774643A (en) | 2022-07-22 |
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| CN202210508813.6A Pending CN114774643A (en) | 2022-05-10 | 2022-05-10 | Improved heat treatment method for M42 material full-hardened working roll |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62158803A (en) * | 1985-12-29 | 1987-07-14 | Kobe Steel Ltd | Production of work roll for cold rolling |
| US20160214177A1 (en) * | 2013-10-02 | 2016-07-28 | Uddeholms Ab | Corrosion and wear resistant cold work tool steel |
| CN211546617U (en) * | 2020-01-10 | 2020-09-22 | 太仓市五洲轧辊有限公司 | Energy-saving and efficient roller quenching device |
| CN112981084A (en) * | 2021-02-20 | 2021-06-18 | 无锡亿宝机械设备有限公司 | Heat treatment method of full-hardened working roll |
| CN113416831A (en) * | 2021-05-27 | 2021-09-21 | 中钢集团邢台机械轧辊有限公司 | Heat treatment process method for wide aluminum cold-rolled working roll |
-
2022
- 2022-05-10 CN CN202210508813.6A patent/CN114774643A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62158803A (en) * | 1985-12-29 | 1987-07-14 | Kobe Steel Ltd | Production of work roll for cold rolling |
| US20160214177A1 (en) * | 2013-10-02 | 2016-07-28 | Uddeholms Ab | Corrosion and wear resistant cold work tool steel |
| CN211546617U (en) * | 2020-01-10 | 2020-09-22 | 太仓市五洲轧辊有限公司 | Energy-saving and efficient roller quenching device |
| CN112981084A (en) * | 2021-02-20 | 2021-06-18 | 无锡亿宝机械设备有限公司 | Heat treatment method of full-hardened working roll |
| CN113416831A (en) * | 2021-05-27 | 2021-09-21 | 中钢集团邢台机械轧辊有限公司 | Heat treatment process method for wide aluminum cold-rolled working roll |
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