CN105483354A - Heat treatment method for large high-speed steel cold-rolled work roll - Google Patents

Heat treatment method for large high-speed steel cold-rolled work roll Download PDF

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Publication number
CN105483354A
CN105483354A CN201510979340.8A CN201510979340A CN105483354A CN 105483354 A CN105483354 A CN 105483354A CN 201510979340 A CN201510979340 A CN 201510979340A CN 105483354 A CN105483354 A CN 105483354A
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Prior art keywords
roll
heat treatment
temperature
treatment
speed steel
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CN201510979340.8A
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CN105483354B (en
Inventor
杨昱东
刘娣
苗金平
苏军新
崔聪聪
朱学刚
闫红霞
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Sinosteel Xingtai Machinery and Mill Roll Co Ltd
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Sinosteel Xingtai Machinery and Mill Roll Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/38Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34Methods of heating
    • C21D1/42Induction heating
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

The invention discloses a heat treatment method for a large high-speed steel cold-rolled work roll, and belongs to the technical field of heat treatment. The heat treatment method comprises pretreatment, preheat treatment and finish heat treatment. The preheat treatment comprises integral low-temperature preheat and continuous induction heating preheat. During continuous induction heating preheat, the temperature of the roll when the roll gets out of an induction coil is required to be 600-750 DEG C, the roll continues to move upwards, air cooling is conducted for 15-35 min after the roll gets out of the induction coil, and finish heat treatment is conducted. The heat treatment method is different from a conventional continuous induction quenching manner, the roll body continuous induction preheat treatment step is added on the basis of conventional integral preheat, and the heat treatment success rate of the large high-speed steel roll can be greatly increased. Meanwhile, cold treatment is added after first-time tempering of the roll is conducted, a roll body has hardness of 90 HSD or more after finish heat treatment of the high-speed steel cold-rolled work roll is conducted, and the technology requirement of a cold-rolled steel plate can be completely met.

Description

The heat treating method of large high-speed steel cold roll
Technical field
The present invention relates to a kind of heat treating method of large-sized forging rapid steel cold roll, belong to technical field of heat treatment.
Background technology
For realizing rolling high precision cold rolled strip and improving milling train production efficiency, mill milling speed goes is fast, rolled strip thickness is more and more thinner, stocking resistance to deformation is increasing.The main flow material of current cold roll is 3%Cr and 5%Cr; after heat treatment of workpieces, the body of roll can obtain the high rigidity of more than 90HSD; the surface quality requirements of cold-rolled steel sheet can be met; but due to material self-characteristic; this high rigidity can only ensure with low tempering temperature, and usual tempering temperature is below 160 DEG C.
But in actual production, often have some and be such as with the rolling accidents such as steel skidding, sideslip, broken belt, steel bonding, these accidents make working roll body of roll local surfaces be rapidly heated, and cool fast again afterwards, make working roll body of roll local surfaces subjected to a thermal shocking under emulsion rinses.Different according to the light and heavy degree of rolling accident, when working roll suffers thermal shocking accident, surface temperature raises also different, but often all more than 400 DEG C, therefore the roll of conventional material low-temperaturetempering is very easily because suffering thermal shocking accident to cause the inefficacy such as body surface crackle and localized delamination, can not meet the requirement of present-day mill rolling high-strength, high precision, ultra-thin steel sheet; In common material roll, carbide quantity is few simultaneously, and hardness is low, and roll wears no resistance, and gloss level of roll decay is too fast in the continuous mill operation of rolling, does not arrive the roll change cycle and will change roll because roughness is not enough, thus reduce rolling efficiency toward contact.
Rapid steel material has good hardening capacity, red hardness, high-speed steel roll is given with features such as high temper resistance, thermal-shock resistance, high rigidity, high abrasion, high roughness maintenances from face, solving this problem well, is the renewal product of modernization cold continuous rolling, single stand mill working roll and levelling machine working roll.Thermal treatment is a difficult problem during large-sized forging rapid steel cold roll is produced, because quenching temperature is high, quenching process interrupts, thermal treatment cracking had been once the major hidden danger affecting the safety in production of large-sized forging high-speed steel roll, next is difficult at high temperature tempering obtain high hardness of roll body, and these two factors govern the production of large high-speed steel cold roll and apply.
Therefore the selection of thermal treatment process is the key problem in technology that large-sized forging high-speed steel roll is produced, both needed to ensure safety in production, prevent thermal treatment interruption, thermal treatment cracking equipment and personnel are damaged, ensure that roll obtains high working lining hardness after high tempering and use properties meets design and production scene requirement again, for forging high-speed steel roll applying on cold strip rolling mill is laid a solid foundation.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of heat treating method of large-sized forging rapid steel cold roll, can prevent heat-treatment quenching from interrupting, the thermal treatment problem of Cracking of effective solution large high-speed steel cold roll, simultaneously after high tempering, hardness of roll body can reach more than 90HSD and radial stiffness drop is very little, can meet the technical requirements of cold-rolled steel sheet breaker roll completely.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
A heat treating method for large-sized forging rapid steel cold roll, comprises preliminary treatment and finished heat treatment, between preliminary treatment and finished heat treatment, is provided with thermal pretreatment, and described thermal pretreatment comprises following two steps:
A, overall low-temperature prewarming: the roll after preliminary treatment is carried out overall low-temperature prewarming, preheating insulation temperature is 220 ~ 450 DEG C, soaking time 10 ~ 20h;
B, induction heating preheating continuously: lifted by continuous induction hardening requirement by the roll after processing of step A, then roll movement is from bottom to top carried out sense of continuity and should be heated preheating, and the temperature requirement that roll goes out last induction coil is 600 ~ 750 DEG C; Roll is continued to move up, goes out air cooling 15 ~ 35min minute after induction coil.
The further improvement of technical solution of the present invention is: finished heat treatment comprises the following steps:
C, continuous induction hardening process: by quenching technology requirement, position is adjusted to the roll after thermal pretreatment, then sense of continuity is carried out in roll movement from top to bottom and answer heating quenching, quenching temperature 1080 ~ 1120 DEG C, roll adopts continuous water spray mode quench cooled after moving out induction coil, after Quench heating terminates, continue breaker roll upper end and carry out water-spraying control 20 ~ 40min;
D, temper: the temper of the roll after step C process being carried out to 400 DEG C/30h ~ 540 DEG C/30h, tempering insulation time is 30 ~ 100h;
E, deepfreeze: the deepfreeze roll after step D process being carried out to-200 DEG C/6h ~-150 DEG C/6h;
F, repeating step D more than twice, be finally machined to finished product by drawing.
The further improvement of technical solution of the present invention is: adopt bench vehicle type electrical resistance furnace breaker roll to carry out overall low-temperature prewarming in steps A.
Owing to have employed technique scheme, the technical progress that the present invention obtains is:
Present method is different from conventional continuous induction hardening mode, between preliminary treatment and finished heat treatment, add preheating treatment procedure, avoids the defect of conventional thermal pretreatment+continuous induction hardening, thermal pretreatment comprises two steps: first breaker roll entirety carries out the low-temperature prewarming of 220 ~ 450 DEG C, carry out continuous induction heating preheating again, then final induction quenching is continuously carried out, tempering and deepfreeze, this treatment process significantly can improve large high-speed Steel Roll and be heat-treated to power, effectively avoid the destructive failure such as thermal treatment cracking, and the body of roll obtains the high rigidity of more than 90HSD after making the thermal treatment of rapid steel cold roll, and uniformity of hardness is high, radial stiffness drop is little, when cold belt continuous mill is applied, roughness retaining capability is very outstanding, change 3-4 times that the grinding roller cycle can reach common material cold roll, stock removal is without the need to increasing, and the surface quality of institute's rolling sheets can meet technical requirements completely.
Increase continuous induction heating preheating, the front body of roll temperature of quenching can be improved, reduce the power demand to equipment when quenching heat, effectively prevent quenching from interrupting.
In continuous induction hardening process, to quench cooled intensity and follow-up cooling time of quenching accurate, reasonably control, efficiently solve high-speed steel roll hardening crack problem;
After deepfreeze in step e is arranged in a high tempering, can ensures to carry out deepfreeze under unrelieved stress obtains the prerequisite of safety control, avoid roll stress to be superimposed upon cold-treating process Fracture.Make residual austenite change martensite into further, after making rapid steel cold roll finished heat treatment, the body of roll obtains the hardness of more than 90HSD, reaches the object improving hardness of roll body simultaneously.
Embodiment
Below in conjunction with embodiment, the present invention is described in further details:
Embodiment 1
A heat treating method for large high-speed steel cold roll, the requirement of this working roll is as follows:
Roller diameter:
Hardness of roll body requires: 90 ~ 95HSD;
Working lining thickness requirement: >=33mm;
Roll material: forging rapid steel, adopt electric furnace+ladle refining+esr mode to produce steel ingot, steel ingot is undertaken heating, forging and make roll forging stock by processing requirement.
This heat treating method comprises preliminary treatment, thermal pretreatment and finished heat treatment, and step is as follows:
One, preliminary treatment: carry out preliminary treatment on request to high speed steel cold roller forging stock, is machined to the size of needs by drawing;
Two, thermal pretreatment:
A, overall low-temperature prewarming: the roll bench vehicle type electrical resistance furnace after preliminary treatment is carried out overall low-temperature prewarming, preheating insulation temperature is 220 DEG C, soaking time 14h;
B, induction heating preheating continuously: lifted by continuous induction hardening requirement by the roll after processing of step A, then roll movement is from bottom to top carried out sense of continuity and should be heated preheating, and the temperature that roll goes out induction coil is 700 DEG C; Roll is continued to move up, goes out air cooling 15min minute after induction coil;
Three, finished heat treatment:
C, continuous induction hardening process: by quenching technology requirement, position is adjusted to the roll after thermal pretreatment, then sense of continuity is carried out in roll movement from top to bottom and answer heating quenching, quenching temperature 1100 DEG C, roll adopts continuous water spray mode quench cooled after moving out induction coil; After Quench heating terminates, continue breaker roll upper end and carry out water-spraying control 40min;
D, temper: the temper of the roll after step C process being carried out to 480 DEG C/30h, tempering insulation time is 30h;
E, deepfreeze: the deepfreeze roll after step D process being carried out to-180 DEG C/6h;
G, tempering temperature is adjusted to 520 DEG C, and repeats twice, be finally machined to finished product by drawing.
Embodiment 2
Being distinguished as of the present embodiment and embodiment 1: the preheating insulation temperature in steps A is 350 DEG C, soaking time 20h.
Embodiment 3
Being distinguished as of the present embodiment and embodiment 1: in step B, roll goes out the temperature of induction coil is 750 DEG C; Roll is continued to move up, goes out air cooling 20min minute after induction coil.
Embodiment 4
Being distinguished as of the present embodiment and embodiment 1: quenching temperature 1120 DEG C in step C, in step D, tempering temperature is 530 DEG C, carries out-200 DEG C/6h deepfreeze after temper, carries out the temper that three temperature are 530 DEG C after deepfreeze again.
Embodiment 5
Being distinguished as of the present embodiment and embodiment 1: in step D, temper temperature is 450 DEG C.
Embodiment 6
The present embodiment is comparative example, and compared with example 1, the thermal pretreatment before finished heat treatment adopts common process, and namely only carry out overall low-temperature prewarming, preheating temperature 220 DEG C, do not perform the continuous induction heating preheating of step B, all the other techniques are with embodiment 1.
After the product finished heat treatment of embodiment 1 ~ embodiment 6, get the test ring that the radial 50mm of the body of roll is dark, mechanical property detection is carried out in tangential sampling, and radial direction carries out hardness determination, and detected result is in table 1.
Table 1 embodiment product mechanical property detected result
Can be found out by table 1 data, when adopting common process to produce, because the low equipment investment power of temperature at the bottom of the body of roll is excessive in quenching process, cause circuit breaker and make quenching failure.Adopt large high-speed steel cold roll prepared by present method, the ratio that quenching is interrupted and the body of roll ftractures is 0, all in more than 90HSD, surface hardness homogeneity and radial 35mm, hardness drop is all within 2HSD for finished product body of roll surface hardness, and being heat-treated to power is 100%.

Claims (3)

1. a heat treating method for large high-speed steel cold roll, comprises preliminary treatment and finished heat treatment, it is characterized in that: between preliminary treatment and finished heat treatment, be provided with thermal pretreatment, and described thermal pretreatment comprises following two steps:
A, overall low-temperature prewarming: the roll after preliminary treatment is carried out overall low-temperature prewarming, preheating insulation temperature is 220 ~ 450 DEG C, soaking time 10 ~ 20h;
B, induction heating preheating continuously: lifted by continuous induction hardening requirement by the roll after processing of step A, then roll movement is from bottom to top carried out sense of continuity and should be heated preheating, and the temperature requirement that roll goes out induction coil is 600 ~ 750 DEG C; Roll is continued to move up, goes out air cooling 15 ~ 35min minute after induction coil.
2. the heat treating method of large high-speed steel cold roll according to claim 1, is characterized in that: finished heat treatment comprises the following steps:
C, continuous induction hardening process: by quenching technology requirement, position is adjusted to the roll after thermal pretreatment, then sense of continuity is carried out in roll movement from top to bottom and answer heating quenching, quenching temperature 1080 ~ 1120 DEG C, roll adopts continuous water spray mode quench cooled after moving out induction coil; After Quench heating terminates, continue breaker roll upper end and carry out water-spraying control 20 ~ 40min;
D, temper: the temper of the roll after step C process being carried out to 480 DEG C/30h ~ 540 DEG C/30h, tempering insulation time is 30 ~ 100h;
E, deepfreeze: the deepfreeze roll after step D process being carried out to-200 DEG C/6h ~-150 DEG C/6h;
F, repeating step D more than twice, be finally machined to finished product by drawing.
3. the heat treating method of large high-speed steel cold roll according to claim 1 and 2, is characterized in that: adopt bench vehicle type electrical resistance furnace breaker roll to carry out overall low-temperature prewarming in steps A.
CN201510979340.8A 2015-12-23 2015-12-23 The heat treatment method of large high-speed steel cold roll Active CN105483354B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107177721A (en) * 2017-06-29 2017-09-19 太仓市钧胜轧辊有限公司 A kind of quenching technology for surfaces for roll
CN109457102A (en) * 2018-12-12 2019-03-12 中钢集团邢台机械轧辊有限公司 A kind of heat treatment method of M2 high-speed steel working roll
CN109468451A (en) * 2018-12-12 2019-03-15 中钢集团邢台机械轧辊有限公司 A kind of heat treatment method of 55NiCrMoV7 roller roller
CN112391582A (en) * 2020-11-18 2021-02-23 宝钢轧辊科技有限责任公司 Ultra-deep quench hardening layer forged steel cold rolling working roll and manufacturing method thereof

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CN104032117A (en) * 2014-05-12 2014-09-10 宜兴市永昌轧辊有限公司 Heat treatment method for ultra-high-hardness nonferrous-metal cold roll
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107177721A (en) * 2017-06-29 2017-09-19 太仓市钧胜轧辊有限公司 A kind of quenching technology for surfaces for roll
CN109457102A (en) * 2018-12-12 2019-03-12 中钢集团邢台机械轧辊有限公司 A kind of heat treatment method of M2 high-speed steel working roll
CN109468451A (en) * 2018-12-12 2019-03-15 中钢集团邢台机械轧辊有限公司 A kind of heat treatment method of 55NiCrMoV7 roller roller
CN109468451B (en) * 2018-12-12 2020-09-15 中钢集团邢台机械轧辊有限公司 Heat treatment method of 55NiCrMoV7 roller way roller
CN112391582A (en) * 2020-11-18 2021-02-23 宝钢轧辊科技有限责任公司 Ultra-deep quench hardening layer forged steel cold rolling working roll and manufacturing method thereof

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