CN103074482B - Regeneration method of scrapped Cr5 forged-steel working roller - Google Patents

Regeneration method of scrapped Cr5 forged-steel working roller Download PDF

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Publication number
CN103074482B
CN103074482B CN201110329340.5A CN201110329340A CN103074482B CN 103074482 B CN103074482 B CN 103074482B CN 201110329340 A CN201110329340 A CN 201110329340A CN 103074482 B CN103074482 B CN 103074482B
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tempering
hour
roll
quenching
temperature
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CN103074482A (en
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彭辉
张青
孙大乐
葛浩彬
吴卫强
印建军
徐展
顾晓辉
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Baoshan Iron and Steel Co Ltd
Baosteel Group Changzhou Roll Manufacture Co
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Baoshan Iron and Steel Co Ltd
Baosteel Group Changzhou Roll Manufacture Co
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    • 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 provides a regeneration method of a scrapped Cr5 forged-steel working roller. The method comprises the steps of working roller detection, 680-700 DEG C high-temperature tempering process, twice quenching and tempering processes, and surface hardening process. In the twice quenching and tempering processes, first quenching and tempering comprises the steps that temperature is maintained at 940-980 DEG C for more than 12h and quenching is carried out; and temperature is maintained at 630-660 DEG C for 18-25h and tempering is carried out, wherein a target roller hardness is 35-45HSD; second quenching and tempering comprises the steps that temperature is maintained at 940-980 DEG C for more than 12h and quenching is carried out; and temperature is maintained at 630-660 DEG C for 18-25h and tempering is carried out, wherein a target roller hardness is 40-50HSD. With the steps, the scrapped Cr5 forged-steel working roller reaches application performances of a new roller. When the method provided by the invention is used in regeneration manufacturing of scrapped Cr5 forged-steel working roller, cost can be greatly saved.

Description

A kind of renovation process of scrapping Cr5 forged steel working roll
Technical field
The invention belongs to material and Field of Heat-treatment relates to, is a kind of renovation process of cold roll, particularly scraps the method for selected, renovation process, thermal treatment process and the X stress test of roller.
Background technology
Along with steel, continue intimately, the demand of roll sharply rises.At present, the main material of cold roll (comprising intermediate roll) is 5% forged steel series for measuring containing Cr both at home and abroad, by induction or integral quenching, reach certain working lining thickness, particularly whole roll material is the same, guarantees that the indexs such as inner clamps foreign material content, distribution of carbides and loose, segregation are better by ESR and forging manufacturing technique.
By manufacturing process, from smelting, until hydrogen annealing is expanded in nodularization, be the preparatory stage of Cr5 forged steel roller stock, during energy consumption account for half left and right of whole manufacturing procedure.The defects such as the principal feature of scrapping roller is to exist visual appearance not good, the netted and alligatoring of carbide surface.Meanwhile, the condemnation factor of Cr5 forged steel roller is in 90% left and right.Therefore, utilization is scrapped Cr5 forged steel working roll and is carried out other target roll of Remanufacture, can not only be cost-saving, more can reduce the carbon emission of considerable part, and this is a very significant thing.
Up to the present, be only applied to the simple transformation of the way (as Chinese patent 93111115.3, relating to a kind of reforming technology of waste or old roll) of the Cr2 roll of small section mill, for the large-scale continuous mill of Cr5 forged steel material, with roller Remanufacture, have no report.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is: the large-scale working roll of Cr5 forged steel material, the intermediate roll that for current large-scale tandem rolling unit, use, provide a kind of little regeneration manufacturing method that changes greatly.
Technical scheme of the present invention is: a kind of renovation process of the Cr5 of scrapping forged steel working roll, comprise the detection of working roll, and the method comprises the following steps:
(1) working roll detects: reject and have the old roller of through hole and the old roller that outward appearance has severe steel bonding;
(2) high-temperature tempering process: working roll is heated to 680~700 ℃, is incubated 15 hours cooling above, the target roll hardness that makes to regenerate is at 30~45HSD;
(3) hardening and tempering process: modified is for the first time after 940~980 ℃ of insulations are quenched for 10-15 hour, 630~660 ℃ of insulations tempering in 15-25 hour, target roll hardness is at 35~45HSD; Modified is for the second time after 940~980 ℃ of insulations are quenched for 10-15 hour, and 610~650 ℃ of insulations tempering in 15-25 hour, makes target roll hardness at 40~50HSD;
(4) quenching technology for surfaces: first carry out after 200~350 ℃ of preheatings at electric furnace, quench at double frequency lathe upper surface, adopt different induction coil translational speeds to control the depth of hardening zone of target roll, quenching temperature is 970~1010 ℃; Between be controlled at-800~1000MPa of residual stress level.
After (4) step quenching technology for surfaces, the hardness of the body of roll rises to 93-98HSD.
According to the renovation process of scrapping Cr5 forged steel working roll of the present invention, be preferably, the heating steps of described step (2) is: first furnace temperature is risen to 250~300 ℃, insulation 10-15 hour, is then warming up to 680~700 ℃ with the speed of 30-60 per hour ℃.
According to the renovation process of scrapping Cr5 forged steel working roll of the present invention, be preferably, in described hardening and tempering process for the first time, the heating process before quenching is: first furnace temperature is risen to 650~700 ℃, insulation 10-18 hour; Then with the speed of 30-60 per hour ℃, be warming up to 940~980 ℃.
Preferably, in described hardening and tempering process for the second time, the heating process before quenching is: first furnace temperature is risen to 650~700 ℃, insulation 10-18 hour; Then with the speed of 30-60 per hour ℃, be warming up to 940~980 ℃.
The detection of scrapping Cr5 forged steel working roll mainly comprises that magnetic detection is involved on appearance quality detection, geometrical dimension detection, Chemical Composition analysis, ultrasound examination, surface and metallographic detects.Wherein first four is essential items for inspection, according to reality, detects at restructuring process to determine whether latter two are detected.Primitive decision principle is as follows:
1. for reduce the risk of thermal treatment link cracking and use in easily there is roll breakage quality accident, generally have the old roller of through hole to be not used in the transformation of the way; Outward appearance can not have severe steel bonding (severe steel bonding refers to that the body of roll is wound around a lot of steel plates of adhesion, roll surface turn blue variable color);
2. size will meet the size of the roller of regenerating.The diameter of the new roller of target must meet original the more than 2/3 of roller green diameter of scrapping; Because roll can not infinitely be changed a social system regeneration, to certain diameter, inner segregation and be mingled with and can worsen, affect roll use, and process dissection and analysis, is set in 2/3.
Other preferred decision principles are:
1. the old roller of low carbon content is not used in the working roll of high rigidity; The carbon content of MC5 material roll is 0.82~0.92%, and low carbon content refers to that carbon content is lower than 0.82% old roller, and high rigidity refers to that hardness is greater than the new roller of 95HSD;
When 2. the flaw detection of old roller has F=¢ 3 defect, twice modified rear detection becomes the processing of greatly not regenerating as Defect Equivalent; F=¢ 3 is the Defect Equivalent on GB/T13314-2008 working roll for forged steel cold rolling general technical specifications.It is movable that twice modified rear Defect Equivalent becomes large this defect of explanation, in the quenching in later stage with in using, possesses danger, need to scrap.
3. old roller netted and alligatoring problem appearance if any carbide surface, need to carry out normalizing thermal treatment and improve.The netted Carbide Coarsening in surface refers to and is nettedly greater than 3 grades, and normalizing thermal treatment generally refers to and be heated to 900~940 ℃, and after insulation certain hour, air cooling, to room temperature, then carries out the high tempering of 630~670 ℃ and processes.Described normalizing treatment was carried out before hardening and tempering process is processed.
After handling, with X measuring stress instrument, detecting its residual stress level, is mainly by detection, to control the residual stress level of new roller.Because the stress of suitable roller surface is unsuitable excessive, cracking during thermal shock in advance, the tendency that reduction roll surface cracks.By detecting the unrelieved stress of target roll, make between be controlled at-800~1000MPa of residual stress level, lower than again quenching after this interval high tempering again; Higher than this interval, need tempering again, regulate residual stress level in this interval.
The invention has the beneficial effects as follows: by basic detection, high-temperature tempering process, twice hardening and tempering process and hard surfacing, processed and regulated, the Cr5 forged steel working roll that makes to scrap has reached the use properties of new roller.Scrap in this way the Remanufacture of Cr5 forged steel working roll, target roll is applied on large-scale tandem rolling unit, and result of use reaches the use properties of new roller.According to present method, for Cr5 forged steel material roll, realize up to a hundred of transformation of the way regeneration every year, save the up to ten million units of procurement payment.
Embodiment
Embodiment 1
Scrap Cr5 forged steel material intermediate roll specification: Ф 500 * 1550 * 4400mm
Regeneration target roll specification: Ф 450 * 1430 * 4340mm.Hardness requirement 93~97HSD, depth of hardening zone >=25mm.
Through appearance quality detection, geometrical dimension detection, ultrasound examination and metallographic detection etc., meet regeneration requirement.
First carry out high tempering processing, first furnace temperature is risen to 250~300 ℃, be incubated 12 hours; Then with the speed of 50 ℃ per hour, be warming up to 680~700 ℃, be incubated 15 hours, then air cooling is to room temperature, and detecting regeneration target roll hardness is 35~38HSD;
Pass through rough turn twice modifier treatment of carrying out, concrete technology is:
Modifier treatment for the first time: first furnace temperature is risen to 650~700 ℃, be incubated 10 hours; Then with the speed of 50 ℃ per hour, be warming up to 960~980 ℃, be incubated 12 hours, by carrying out high tempering after oil quenching, high tempering temperature is 640~660 ℃, is incubated 18 hours, and then air cooling is to room temperature.Target roll hardness detects 37~40HSD;
Modifier treatment for the second time: first furnace temperature is risen to 650~700 ℃, be incubated 10 hours, be then warming up to 940~950 ℃ with the speed of 50 ℃ per hour, be incubated 12 hours, by carrying out high tempering after oil quenching, high tempering temperature is 620~630 ℃, be incubated 18 hours, then air cooling is to room temperature.It is 40~42HSD that target roll hardness detects;
After semi-finishing, carry out hard surfacing processing, concrete technology is: according to the hardness requirement of target roll and depth of hardening zone, formulate quenching technology for surfaces.First at electric furnace, carry out after 200~250 ℃ of preheatings, at double frequency lathe upper surface, quench, quenching temperature is 980 ± 5 ℃, and induction coil scanning frequency is 0.5mm/s, and cooling water pressure is 0.15MPa, and tempering temperature is 120 ± 5 ℃, and soaking time is 90 hours.Detecting target roll hardness is 95~96HSD, meets technical requirements.
On target roll surface 3 carry out X measuring stress instrument detect unrelieved stress for-851MPa ,-875MPa and-845MPa, meet the requirements.
Embodiment 2
Scrap Cr5 forged steel material intermediate roll specification: whether Ф 500 * 1550 * 4400mm can supplement a specification different from embodiment 1.
Regeneration target roll specification: Ф 450 * 1430 * 4340mm.Hardness requirement 93~97HSD, depth of hardening zone >=25mm.
Through appearance quality detection, geometrical dimension detection, ultrasound examination and metallographic detection etc., meet regeneration requirement.
First carry out high tempering processing, first furnace temperature is risen to 250~300 ℃, be incubated 14 hours; Then with the speed of 52 ℃ per hour, be warming up to 680~700 ℃, be incubated 15 hours, then air cooling is to room temperature, and detecting regeneration target roll hardness is 35~38HSD;
Pass through rough turn twice modifier treatment of carrying out, concrete technology is:
Modifier treatment for the first time: first furnace temperature is risen to 680~700 ℃, be incubated 12 hours; Then with the speed of 55 ℃ per hour, be warming up to 960~970 ℃, be incubated 15 hours, by carrying out high tempering after oil quenching, high tempering temperature is 640~660 ℃, is incubated 18 hours, and then air cooling is to room temperature.Target roll hardness detects 37~40HSD;
Modifier treatment for the second time: first furnace temperature is risen to 680~700 ℃, be incubated 12 hours, be then warming up to 940~950 ℃ with the speed of 55 ℃ per hour, be incubated 12 hours, by carrying out high tempering after oil quenching, high tempering temperature is 630~640 ℃, be incubated 20 hours, then air cooling is to room temperature.It is 43~45HSD that target roll hardness detects;
After semi-finishing, carry out hard surfacing processing, concrete technology is: according to the hardness requirement of target roll and depth of hardening zone, formulate quenching technology for surfaces.First at electric furnace, carry out after 200~250 ℃ of preheatings, at double frequency lathe upper surface, quench, quenching temperature is 990 ± 5 ℃, and induction coil scanning frequency is 0.5mm/s, and cooling water pressure is 0.15MPa, and tempering temperature is 125 ± 5 ℃, and soaking time is 85 hours.Detecting target roll hardness is 96~97HSD, meets technical requirements.
On target roll surface 3 carry out X measuring stress instrument detect unrelieved stress for-867MPa ,-856MPa and-846MPa, meet the requirements.
Embodiment 3
Scrap Cr5 forged steel material intermediate roll specification: Ф 500 * 1550 * 4400mm
Regeneration target roll specification: Ф 450 * 1430 * 4340mm.Hardness requirement 93~97HSD, depth of hardening zone >=25mm.
Through appearance quality detection, geometrical dimension detection, ultrasound examination and metallographic detection etc., meet regeneration requirement.
First carry out high tempering processing, first furnace temperature is risen to 250~300 ℃, be incubated 12 hours; Then with the speed of 55 ℃ per hour, be warming up to 680~700 ℃, be incubated 18 hours, then air cooling is to room temperature, and detecting regeneration target roll hardness is 35~38HSD;
Pass through rough turn twice modifier treatment of carrying out, concrete technology is:
Modifier treatment for the first time: first furnace temperature is risen to 650-680 ℃, be incubated 12 hours; Then with the speed of 53 ℃ per hour, be warming up to 960~970 ℃, be incubated 15 hours, by carrying out high tempering after oil quenching, high tempering temperature is 640~660 ℃, is incubated 18 hours, and then air cooling is to room temperature.Target roll hardness detects 37~40HSD;
Modifier treatment for the second time: first furnace temperature is risen to 660-670 ℃, be incubated 15 hours, be then warming up to 960~980 ℃ with the speed of 58 ℃ per hour, be incubated 15 hours, by carrying out high tempering after oil quenching, high tempering temperature is 640~645 ℃, be incubated 22 hours, then air cooling is to room temperature.It is 46~48HSD that target roll hardness detects;
After semi-finishing, carry out hard surfacing processing, concrete technology is: according to the hardness requirement of target roll and depth of hardening zone, formulate quenching technology for surfaces.First at electric furnace, carry out after 200~250 ℃ of preheatings, at double frequency lathe upper surface, quench, quenching temperature is 1000 ± 5 ℃, and induction coil scanning frequency is 0.5mm/s, and cooling water pressure is 0.15MPa, and tempering temperature is 130 ± 5 ℃, and soaking time is 85 hours.Detecting target roll hardness is 96~97HSD, meets technical requirements.
On target roll surface 3 carry out X measuring stress instrument detect unrelieved stress for-833MPa, 831MPa and-841MPa, meet the requirements.
Embodiment 4
Except quenching temperature in hard surfacing processing is 970 ± 5 ℃, tempering temperature is 120 ± 5 ℃, and soaking time is that beyond 95 hours, other are with embodiment 1.
On target roll surface 3 carry out X measuring stress instrument detect unrelieved stress for-873MPa ,-876MPa and-871MPa, meet the requirements.
Embodiment 5
Except quenching temperature in hard surfacing processing is 995 ± 5 ℃, tempering temperature is 125 ± 5 ℃, and outside high tempering treatment process, other are with embodiment 1.
High tempering is processed, and first furnace temperature is risen to 260-280 ℃, is incubated 16 hours; Then with the speed of 50 ℃ per hour, be warming up to 680~700 ℃, be incubated 15 hours, then air cooling is to room temperature, and detecting regeneration target roll hardness is 42-44HSD.
On target roll surface 3 carry out X measuring stress instrument detect unrelieved stress for-855MPa ,-856MPa and-851MPa, meet the requirements.
The present invention is processed and is regulated by basic detection, high-temperature tempering process, twice hardening and tempering process and hard surfacing, and the Cr5 forged steel working roll that makes to scrap has reached the use properties of new roller.Scrap in this way the Remanufacture of Cr5 forged steel working roll, can be greatly cost-saving.

Claims (5)

1. scrap a renovation process for Cr5 forged steel working roll, comprise the detection of working roll, it is characterized in that: the method comprises the following steps:
(1) working roll detects: reject and have the old roller of through hole and the old roller that outward appearance has severe steel bonding;
(2) high-temperature tempering process: first furnace temperature is risen to 250~300 ℃, insulation 10-15 hour, is then warming up to 680~700 ℃ with the speed of 30-60 per hour ℃, be incubated 15 hours cooling above, and the target roll hardness that makes to regenerate is at 30~45HSD;
(3) hardening and tempering process: modified is for the first time after 940~980 ℃ of insulations are quenched for 10-15 hour, 630~660 ℃ of insulations tempering in 15-25 hour, target roll hardness is at 35~45HSD; Modified is for the second time after 940~980 ℃ of insulations are quenched for 10-15 hour, and 610~650 ℃ of insulations tempering in 15-25 hour, makes target roll hardness at 40~50HSD;
(4) quenching technology for surfaces: first carry out after 200~350 ℃ of preheatings at electric furnace, quench at double frequency lathe upper surface, adopt different induction coil translational speeds to control the depth of hardening zone of target roll, quenching temperature is 970~1010 ℃; Between be controlled at-800~1000MPa of residual stress level.
2. the renovation process of scrapping Cr5 forged steel working roll according to claim 1, is characterized in that: old roller is netted and alligatoring problem appearance if any carbide surface, carries out normalizing thermal treatment and improves.
3. the renovation process of scrapping Cr5 forged steel working roll according to claim 2, is characterized in that: described normalizing treatment was carried out before hardening and tempering process is processed.
4. the renovation process of scrapping Cr5 forged steel working roll according to claim 1, is characterized in that: in described hardening and tempering process for the first time, the heating process before quenching is: first furnace temperature is risen to 650~700 ℃, insulation 10-18 hour; Then with the speed of 30-60 per hour ℃, be warming up to 940~980 ℃.
5. the renovation process of scrapping Cr5 forged steel working roll according to claim 1, is characterized in that: in described hardening and tempering process for the second time, the heating process before quenching is: first furnace temperature is risen to 650~700 ℃, insulation 10-18 hour; Then with the speed of 30-60 per hour ℃, be warming up to 940~980 ℃.
CN201110329340.5A 2011-10-26 2011-10-26 Regeneration method of scrapped Cr5 forged-steel working roller Active CN103074482B (en)

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Publication number Priority date Publication date Assignee Title
CN107400756A (en) * 2017-07-10 2017-11-28 安徽盛世高科轨道装备有限公司 A kind of heat-treatment technology method
CN110760664B (en) * 2018-07-26 2021-07-16 宝山钢铁股份有限公司 Repair heat treatment process for improving performance of initially rolled graphite steel roller
CN110396588A (en) * 2019-08-19 2019-11-01 邢台利德机械轧辊制造有限公司 A kind of all kinds of methods remanufactured using failure forging steel cold roll

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