CN101698902A - Quenching method for integral cast steel supporting roll - Google Patents
Quenching method for integral cast steel supporting roll Download PDFInfo
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- CN101698902A CN101698902A CN200910212432A CN200910212432A CN101698902A CN 101698902 A CN101698902 A CN 101698902A CN 200910212432 A CN200910212432 A CN 200910212432A CN 200910212432 A CN200910212432 A CN 200910212432A CN 101698902 A CN101698902 A CN 101698902A
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Abstract
The invention relates to a quenching method of an integral cast steel supporting roll, which is an improvement of the quenching method of the working layer of the integral cast steel supporting roll, and the method is characterized in that the integral heating of the supporting roll comprises the following steps: first, heating the quenched and tempered supporting roll according to a heating rate of less than or equal to 20 DEG C/h to the temperature which is 50-100 DEG C below the cotectic curve temperature, and keeping temperature for 13D-20D; transferring the supporting roll into a differential heating furnace, quickly heating the supporting roll according to the heating rate of greater than or equal to 250 DEG C/h under slow rotation until the surface temperature is greater than or equal to the quenching temperature, and keeping temperature until the thermoosmosis thickness is greater than or equal to the required depth of the hardening layer; transferring the roll into a water quenching machine, carrying out rotating water spray quenching when the surface temperature is greater than or equal to 850 DEG C at the cooling rate of greater than or equal to 2 DEG C/s for the spray quenching of the roll, and stopping spraying water when the surface temperature is less than or equal to 220 DEG C; and transferring the roll into a heating furnace for tempering treatment to obtain the roll of which the surface hardness is 55-75HSD, the uniformity of the surface hardness is less than or equal to +/-1HSD, the radial hardness drop of the hardening layer is less than or equal to 0.5HSD/cm, and the tensile strength of the hardening layer is greater than or equal to 1200MPa. Compared with the prior art, the invention has high hardness of the working layer, good hardness uniformity, good hardening capacity, controllable depth of the hardening layer and small radial hardness drop.
Description
Technical field
The present invention relates to the metal heat treatmet field, particularly to the improvement of integral cast steel supporting roll working lining quenching method.
Background technology
Integral cast steel supporting roll with forging and composite support roller ratio, has reduced forging process and composite casting process because production technique is simple, and the one-time cast-forming cost is low, and use properties is reliable and stable, more and more is subjected to the welcome of hot-rolled and cold-rolled strip mill.Because the restriction of heat-treated equipment and quenching technology, prior art is to support roll work top layer quench treatment, can only adopt whole type of heating heating support roll workpiece, quenching technology roughly is divided into preheating insulation section, the spray section of quenching and three process sections of tempering section, wherein the preheating insulation section adopts and is warming up to quenching temperature (usually at 900-950 ℃) continuously, and insulation chien shih heat is for the moment permeated to internal layer, and it is approaching substantially to reach internal and external temperature, stove tempering (Fig. 2) is advanced in the spray quenching of coming out of the stove.Because the integral cast steel supporting roll diameter is usually at 1.2-2.0 rice, length is at 1-5 rice, this integral body is heated to the quenching technology of the entire body heating quenching temperature of inside and outside (radially) basic equality of temperature (quenching temperature), because the support roll volume is big, thermal capacity is also big, the high time of energy expenditure is long in heating and insulating process, work top layer spray quenching, spray time of quenching is long, and water consumption is big, and after the quench cooled of top layer, inner radial remains the condition of high temperature, easily causes workpiece quenching quench-hardened case to return temperature, the workpiece self-annealing, surface hardness and quench-hardened case bottom hardness reduce, quench-hardened case radial stiffness drop increases, and the body surface uniformity of hardness is inconsistent, and depth of hardening zone is difficult to control, all cause quench-hardened case tensile strength to reduce after the above-mentioned self-annealing, influence work-ing life; Secondly, this quenching technology, not only energy consumption height, and warm-up time is long, and 1.5 meters of the diameters of quenching are grown 1.78 meters support rolls, heat tracing time needs about 140 hours, quenching efficiency is low.Therefore work layer on surface hardness and depth of hardening zone are difficult to control, lack of homogeneity, and quenching efficiency is low, and the energy consumption height is the shortcoming that present equality of temperature heating heat-treatment quenching is difficult to overcome.
The disclosed elimination soft zone in supporting roll of Chinese patent CN1147020 thermal treatment process according to different original condition such as the composition that has the supporting roll of soft band, metallographic structures, adopts isothermal annealing, fog quenching, three steps of tempering process to handle.It still adopts whole equality of temperature type of heating heated parts, and therefore above-mentioned defective still fails to be overcome.Above-mentioned deficiency still has is worth improved place.
Summary of the invention
The object of the invention is to overcome the deficiency of above-mentioned prior art, provide a kind of quenching back body surface hardness high and evenly, quench-hardened case radial stiffness drop is little, intensity is high, long service life, the low quenching method for integral cast steel supporting roll of the heating energy consumption of quenching.
The object of the invention realizes, the main improvement is for being divided into preheating section, differential heating section, the spray section of quenching and four process sections of tempering section with the quenching people, by changing the quenching heating mode, the quick two sections heating in back at a slow speed before heating is divided reach the control support roll quenching temperature degree of depth (radially forming the gradient temperature difference), reduce the heating total energy consumption, and after the minimizing spray quenching, workpiece returns warm self-annealing, thereby overcomes above-mentioned the deficiencies in the prior art, realizes the object of the invention.Specifically, quenching method for integral cast steel supporting roll of the present invention, comprise successively to the whole heating of support roll, the working lining shrend, temper, it is characterized in that support roll integral body is heated to be: elder generation with≤20 ℃/h temperature rise rate, is heated to the following 50-100 of eutectoid line temperature ℃ to the quenched and tempered state support roll, is incubated 13D-20D hour; Move in the differential temperature stove, make support roll temperature rise rate with 〉=250 ℃/h in slowly running, quickly heat up to surface 〉=quenching temperature, be incubated to thermoosmosis thickness 〉=institute and require depth of hardening zone, insulation finishes to move into the shrend machine, rotates spray quenching more than surface temperature 〉=850 ℃, roll spray quenching rate of temperature fall 〉=2 ℃/s, spray quenching stops water spray during to surface temperature≤220 ℃, moves into to add the hot temper of stove, obtains body surface hardness: 55-75HSD; The surface hardness homogeneity :≤± 1HSD; Quench-hardened case radial stiffness drop :≤0.5HSD/cm; Quench-hardened case tensile strength: 〉=1200MPa.Wherein D is the supporting roll diameter, unit rice.
By above-mentioned thermal treatment process scheme, the present invention more specifically technology is:
Before be heated to the following 50-100 of eutectoid line temperature ℃ at a slow speed, for example the cast steel support roller surface temperature is 600-650 ℃, the 13-20 of insulation roller diameter rice doubly hour makes the low warm evenly to central permeate of relative quenching temperature.
The back slowly runs in the differential temperature heat treatment furnace and is rapidly heated, and rotating speed is 5-10rpm, and the heating that slowly runs helps support roll and is heated evenly in the differential temperature stove; Be rapidly heated to quenching temperature, relatively isothermal treatment for short time (is incubated to thermoosmosis thickness 〉=institute and requires depth of hardening zone, test be defined as soaking time be the heating-up time * (0.5-1.2) hour), help forming the heating radial temperature difference, be that working lining reaches quenching temperature (900-950 ℃), and make the internal layer temperature low as far as possible, both can reduce the heating energy consumption, reduce water spray and quenches the time, can alleviate the warm self-annealing of returning after the follow-up shrend again.
〉=850 ℃ are rotated spray quenchings, mainly are to avoid＜850 ℃ of sprays thermal treatment of quenching, and easily cause through hardening bad, the quench-hardened case deficiency.Support roll rotates and quenches, and speed is 5-20rpm.Spray quenching is preferably hydraulic pressure 0.01-0.05MPa, and discharge 0.2-1.0t/min, three cooperate to guarantee rate of temperature fall 〉=2 ℃/s, makes quench-hardened case obtain stable bainite structure and reaches desired durometer level.
Before spray quenching finishes the back tempering, a kind of cooling of drying earlier, for example air quantity 2000-15000m of being preferably
3/ h, blowing 1.5-3 hour is cooled to below 400 ℃ support roll roller temperature, advances stove heating tempering again, helps preventing that support roll from returning hardness and hardness drop that temperature influences roll.
Temper, can be undertaken by the conventional tempering process of this supporting roll, but a kind of temperature rise rate≤15 ℃/h that is preferably, be warming up to 450-550 ℃, carry out insulation (190-480 hour) in 13D-20D hour, the tempering insulation finishes the back furnace cooling and reduces to 100 ℃ and following coming out of the stove, to guarantee that the support roll heat treatment stress is fully discharged, structural transformation is complete, helps improving the stability in use of support roll.
Quenching method for integral cast steel supporting roll of the present invention, owing to change the former type of heating that once is heated to quenching temperature, by the quick two sections heating in back at a slow speed earlier, heating initial stage low speed heats up, and reduce the temperature of heating, after be rapidly heated again and reach quenching temperature to the surface, be incubated to thermoosmosis thickness 〉=institute and require depth of hardening zone, not only can control the support roll quenching temperature degree of depth (reach or be slightly larger than quenching work layer depth), it is temperature required effectively to have guaranteed to require can both reach in the depth of hardening scope quenching, and the inside temperature of quench-hardened case is reduced as far as possible, reduced the heating total energy consumption, and reduce spray quenching workload (water saving 60%, the time shortens 0.5-1 hour), and reduce the back workpiece that quenches and return warm self-annealing.The radially inside and outside differential heating quenching technology that the present invention forms, with respect to prior art, hardened face working lining hardness height, uniformity of hardness is good, hardening capacity is good, hardness exceeds prior art 3HSD, and depth of hardening zone is controlled, and the radial stiffness drop is little≤0.5HSD/cm, quench-hardened case tensile strength height and crystal grain are tiny, reconditioning quality is little in the operation of rolling, and is low by 25% than forged steel and composite roll, and the required overall time of quenching is short, the quenching efficiency height, energy consumption is low, can existing technology saving heating energy consumption about 35%, has overcome the radially isothermal heating defective of quenching and being brought of prior art.
Below in conjunction with a specific embodiment; the present invention is further understood in exemplary illustration and help; but the embodiment detail only is for the present invention is described; do not represent the present invention to conceive whole technical schemes down; therefore should not be construed as limited overall technical solution, some are In the view of the technician, and the unsubstantiality that does not depart from the present invention's design increases and/or change; for example simple the change or replacement of technical characterictic to have same or similar technique effect all belongs to protection domain of the present invention.
Description of drawings
Fig. 1 is a quenching technology heating curve synoptic diagram of the present invention.
Fig. 2 is a prior art quenching technology heating curve synoptic diagram.
Embodiment
Embodiment: with diameter D=1.5 rice integral cast steel supporting roll quenching technology is example.Press roughly 4 process sections of branch shown in Figure 1.Preheating section: at first will be after casting the quenched and tempered state integral cast steel supporting roll, preheating in the bench vehicle type electrical resistance furnace of packing into is heated to 630 ℃ with 12 ℃/h temperature rise rate, is incubated 20 hours; After move in the differential temperature stove and continue to heat, rotate with 8rpm speed, and quickly heat up to the quenching temperature that the surface reaches 910 ℃ with the temperature rise rate of 280 ℃/h, stop heating, in stove the insulation 36 hours to thermoosmosis thickness greater than required depth of hardening zone, the about 35000 degree electricity of heat tracing total energy consumption, 56 hours times spent.Insulation finishes to move into the shrend lathe, on the shrend machine, rotate with 10rpm, in surface temperature more than 880 ℃, with hydraulic pressure 0.03MPa, discharge 0.45t/min subtend water spray carries out spray quenching, regulate hydraulic pressure and/or discharge, streamflow regime and roller velocity of rotation, make but speed 〉=2.3 ℃/s of spray quenching, stop spray when detecting surface temperature≤220 ℃ and quench.After spray was quenched and finished, to the cooling of drying of support roll body surface, air quantity was 2000-15000m
3/ h, blowing 1.5-3 hour prevents that support roll from returning temperature and influencing roll hardness, is cooled to below 400 ℃ in support roll roller temperature, the blowing cooling finishes.Support roll is hung in the bench vehicle type electrical resistance furnace, press 9 ℃/h of temperature rise rate, be warming up to 500 ℃, carry out insulation in 230 hours, the tempering insulation finishes the back furnace cooling and reduces to 100 ℃ and following coming out of the stove, and the support roll heat treatment stress is fully discharged, and structural transformation is complete.Support roll performance index after quenching: body surface hardness: 68HSD; Body of roll quench-hardened case radial stiffness drop :≤0.3HSD/cm; Body of roll quench-hardened case tensile strength: 〉=1350MPa; Body surface uniformity of hardness :≤0.8HSD.
Comparative example: press the conventional heating quenching technology of Fig. 2, with example 1 quenched and tempered state integral cast steel supporting roll after casting, at the bench vehicle type electrical resistance furnace internal heating, be heated to 315 ℃ of insulations 10 hours with≤15 ℃/h heat-up rate, be heated to 620 ℃ with≤20 ℃/h heat-up rate again, be incubated 8-10 hour, be heated to 910 ℃ of insulations 2-3 days with≤20 ℃/h heat-up rate.Come out of the stove and carry out water spray and quench, the rear surface temperature was lower than 200 ℃ of blowings in shrend 2-3 hour, after supporting roll returns warm balance, by room temperature to 910 ℃, was incubated 2-3 days.Rotate spray quenchings at 〉=800 ℃, stop spray during to surface temperature≤200 ℃ and quench.The blowing cooling is cooled to≤550 ℃, and naturally cooling advances stove and slowly is heated to 500 ℃ of tempering temperatures, is incubated 300 hours, is chilled to below 100 ℃ with stove and comes out of the stove.The about 50000 degree electricity of heat tracing total energy consumption, consuming timely are about 3 times of embodiment and more than 2 times at water loss.Performance after quenching: identical material, the low 3 ± 1HSD of diameter support roll hardness; Body of roll quench-hardened case radial stiffness drop 〉=2HSD/cm; Surface hardness homogeneity 〉=4 ± 1HSD.
To those skilled in the art; under this patent design and specific embodiment enlightenment; some distortion that can directly derive or associate from this patent disclosure and general knowledge; those of ordinary skills will recognize also can adopt additive method; or the substituting of known technology commonly used in the prior art; and the mutual various combination between feature; for example look the roller material; size etc.; the variation of some concrete processing parameters; or the like unsubstantiality change, can be employed equally, can both realize and basic identical function of the foregoing description and effect; launch for example no longer one by one to describe in detail, all belong to this patent protection domain.
Claims (9)
1. quenching method for integral cast steel supporting roll comprises successively to the whole heating of support roll, working lining shrend, temper, it is characterized in that support roll integral body is heated to be: elder generation with≤20 ℃/h temperature rise rate, is heated to the following 50-100 of eutectoid line temperature ℃ to the quenched and tempered state support roll, is incubated 13D-20D hour; Move in the differential temperature stove, make support roll temperature rise rate with 〉=250 ℃/h in slowly running, quickly heat up to surface 〉=quenching temperature, be incubated to thermoosmosis thickness 〉=institute and require depth of hardening zone, insulation finishes to move into the shrend machine, rotates spray quenching more than surface temperature 〉=850 ℃, roll spray quenching rate of temperature fall 〉=2 ℃/s, spray quenching stops water spray during to surface temperature≤220 ℃, moves into to add the hot temper of stove, obtains body surface hardness: 55-75HSD; The surface hardness homogeneity :≤± 1HSD; Quench-hardened case radial stiffness drop :≤0.5HSD/cm; Quench-hardened case tensile strength: 〉=1200MPa.Wherein D is the supporting roll diameter, unit rice.
2. according to the described quenching method for integral cast steel supporting roll of claim 1, it is characterized in that heating the support roll surface temperature for the first time is 600-650 ℃.
3. according to the described quenching method for integral cast steel supporting roll of claim 1, rotating speed 5-10rpm is characterized in that slowly running.
4. according to the described quenching method for integral cast steel supporting roll of claim 1, the 0.5-1.2 that it is characterized in that being heated to soaking time after surface 〉=quenching temperature and be the heating-up time in the differential temperature stove doubly.
5. according to the described quenching method for integral cast steel supporting roll of claim 1, it is characterized in that rotating the spray quenching rotating speed is 5-20rpm.
6. according to the described quenching method for integral cast steel supporting roll of claim 5, it is characterized in that spray quenching flow 0.2-1.0t/min, hydraulic pressure 0.01-0.05Mpa.
7. according to the described quenching method for integral cast steel supporting roll of claim 1, it is characterized in that spray quenching finishes the preceding blowing earlier of back tempering cooling.
8. according to the described quenching method for integral cast steel supporting roll of claim 7, it is characterized in that the blowing cooling is with 2000-15000m
3/ h air quantity, blowing 1.5-3h is cooled to below 400 ℃.
9. according to the described quenching method for integral cast steel supporting roll of claim 1, it is characterized in that tempering temperature rise rate≤15 ℃/h, be warming up to 450-550 ℃, insulation in 13D-20D hour, tempering insulation finish the back furnace cooling and reduce to 100 ℃ and following coming out of the stove.
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