CN112322970A - High-chromium steel composite roll collar and manufacturing method thereof - Google Patents
High-chromium steel composite roll collar and manufacturing method thereof Download PDFInfo
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/03—Sleeved rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/04—Centrifugal casting; Casting by using centrifugal force of shallow solid or hollow bodies, e.g. wheels or rings, in moulds rotating around their axis of symmetry
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D1/26—Methods of annealing
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- 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
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- 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
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention relates to the technical field of roll collar casting, and particularly discloses a high-chromium steel composite roll collar and a manufacturing method thereof. The high-chromium steel composite roll collar comprises an outer layer, a transition layer and a core part, wherein the thickness ratio of the outer layer to the transition layer to the core part is 1:0.8-1: 1-1.2; the manufacturing method of the high-chromium steel composite roll collar comprises the following process steps: s1, smelting; s2, centrifugal casting; s3, annealing; s4, quenching and tempering. The composite casting layer of the high-chromium steel composite roll collar provided by the invention is divided into three layers, the composition and the content of alloy elements in the three composite casting layers are simultaneously limited, the plasticity and the toughness of the high-Cr roll collar are improved while the high hardness and the high wear resistance of the high-Cr roll collar working layer are ensured under specific casting conditions, the original performance can be respectively maintained while the organic compounding of a plurality of metal layers is ensured, and the cracking of the roll collar is effectively prevented.
Description
Technical Field
The invention relates to the technical field of roll collar casting, in particular to a high-chromium steel composite roll collar and a manufacturing method thereof.
Background
The main function of the vertical roll of the hot strip continuous rolling mill is to descale and roll the slabs laterally so as to obtain the slabs with uniform width and regular edges. The existing vertical rolls of the tropical rolling mill generally use alloy cast steel and semisteel, and with the pursuit of steel mills for high-quality plates, the alloy cast steel and the semisteel vertical rolls of common materials can not meet the production requirements of a rolling line. In order to reduce the on-machine abrasion amount of the roller, enhance the quality retention of the roller surface, and improve the edge quality of the plate and the efficiency of the rolling mill, the production mode of the hot strip rolling mill vertical roller is changed from integral casting to composite casting so as to prepare the hot strip rolling mill vertical roller with excellent comprehensive performance.
At present, the compound casting of the vertical roll of the hot strip rolling mill generally adopts a compound bushing technology. The composite bushing technology is characterized in that a roller is split into a roller ring and a roller shaft, and the roller can be produced by adopting a centrifugal composite casting mode according to performance requirements of different parts, but the difference between the inner layer alloy and the outer layer alloy of common bimetallic centrifugal casting is large, if the inner layer and the outer layer are organically combined in the casting process, the outer layer high alloy is easily fused into the inner layer, so that the inner layer has more carbides, the toughness is reduced, and cracks appear in the using process. If the outer layer alloy is controlled to be melted, the pouring temperature of the inner layer is reduced or the interval time between the inner layer and the outer layer is prolonged, slag inclusion at the composite position of the inner layer and the outer layer is easily caused, the inner layer can not support the outer layer in the steel rolling process, and the outer layer is cracked in the use process.
Disclosure of Invention
The invention provides a high-chromium steel composite roll collar and a manufacturing method thereof, aiming at the problems that in the composite casting process of the existing composite roll collar, high alloy on the outer layer is easy to be fused into the inner layer, the toughness of the inner layer is reduced, cracks appear in the use process, slag inclusion on the composite position of the inner layer and the outer layer is easy to cause if the alloy on the outer layer is controlled to be fused, and the outer layer cannot be supported by the inner layer in the steel rolling process, so that the outer layer is cracked in the use process.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
the high-chromium steel composite roll collar comprises an outer layer, a transition layer and a core part, wherein the thickness ratio of the outer layer to the transition layer to the core part is 1:0.8-1: 1-1.2;
the alloy elements of the outer layer comprise the following components in percentage by weight: c: 1.2-1.8%, Si: 0.4-1.0%, Mn: 0.6-1.2%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, Cr: 12.0 to 17.0%, Mo: 1.0-3.0%, Ni + V: 0.5-1.5%, the balance being Fe and unavoidable impurities;
the alloy element composition and the weight percentage of the transition layer are as follows: c: 1.2-1.5%, Si: 1.5-2.0%, Mn: 0.3 to 1.0 percent of Fe, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, less than or equal to 0.15 percent of Mo, and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the core part are as follows: c: 1.2-1.5%, Si: 1.5-2.0%, Mn: 0.3-1.0%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, Cr is less than or equal to 0.2%, Ni: 0.4-1.0%, Mo: 0.3-0.8%, and the balance of Fe and inevitable impurities.
Cr has the function of remarkably improving the strength, hardness, wear resistance, hardenability, oxidation resistance and corrosion resistance of the alloy, but the plasticity and toughness of the alloy are seriously reduced by overhigh Cr. Particularly, in the manufacturing of the roll collar, the Cr content of the outer working layer generally does not exceed 10 percent, thereby avoiding cracks in the using process and reducing the service life. Compared with the prior art, the composite casting layer of the high-chromium steel composite roll collar provided by the invention is divided into three layers, namely the outer layer, the transition layer and the core part, and simultaneously the composition and content of alloy elements in the three composite casting layers are limited (wherein the content of Cr in the outer layer can reach 12-17%), so that the organic compounding of the outer layer, the transition layer and the core part of the roll collar can be realized under the specific casting condition, the increase of slag inclusion amount of a compound part caused by the arrangement of the multiple composite layers is avoided, the inner layer cannot support the outer layer in the roll collar steel rolling process, and further the cracking between the outer layer and the transition layer or between the transition layer and the core part in the roll collar using process is avoided.
The transition layer is smelted without adding Cr, and the high Cr alloy can be well controlled to be smelted into the inner layer by compounding with the core. And the thickness proportion of each element composition of the transition layer to the outer layer and the core part can be combined, high-strength compounding with the outer layer and the core part can be realized simultaneously, and the outer layer high Cr alloy can be better blocked from being blended into the inner layer while the outer layer, the transition layer and the core part are organically combined. The plasticity and the toughness of the high Cr roll collar are improved while the high hardness and the high wear resistance of the high Cr roll collar working layer are ensured. The original performance of the multi-metal layer can be respectively kept while the organic composition of the multi-metal layer is ensured, and the cracking of the roll collar is effectively prevented.
The invention also provides a manufacturing method of the high-chromium steel composite roll collar. The manufacturing method at least comprises the following steps:
s1, respectively smelting the raw materials of the outer layer, the transition layer and the core part to respectively obtain outer layer molten steel, transition layer molten steel and core part molten steel; wherein, in the process of smelting the raw materials of the transition layer, rare earth which is 0.18-0.22% of the mass of the raw materials of the transition layer is added to carry out modification treatment on the molten steel of the transition layer; adding rare earth accounting for 0.18-0.22% of the mass of the raw materials of the core part in the process of smelting the raw materials of the core part, and carrying out modification treatment on the molten steel of the core part;
s2, centrifugally casting the outer layer molten steel, centrifugally casting the transition layer molten steel, and centrifugally casting the core molten steel to obtain a roll collar blank;
s3, adding the uncooled roller ring blank into an empty kiln at the temperature of 600-700 ℃, and then heating to the temperature of 800-820 ℃ for annealing;
s4, carrying out heat treatment on the annealed roller ring blank by adopting a quenching and tempering mode, wherein the quenching temperature is 900-1000 ℃, and the tempering temperature is 550-600 ℃.
Compared with the prior art, the manufacturing method of the high-chromium steel composite roll collar effectively solves the technical problems of low wear resistance, poor surface quality of rolled materials, poor interface bonding between an outer layer and a core part and low bonding strength of the composite cast roll collar in the using process, and provides an economical and feasible manufacturing method for the production of the roll collar of large and small vertical rolls of a hot strip mill.
The roll collar has the condition of cracks after cold box opening, and researches show that the roll collar blank is directly put into a kiln for annealing under the condition of not being cooled after centrifugal casting, so that the casting stress of the roll collar can be better eliminated, and the roll collar is prevented from cracking. The annealing design is combined with a specific quenching and tempering treatment mode and heat treatment parameters, so that the wear resistance of the roll collar and the bonding strength of the outer layer and the transition layer and the bonding strength of the transition layer and the inner layer can be effectively improved.
Preferably, in step S1, the melting temperature of the raw material of the outer layer is 1540-1580 ℃.
Preferably, in step S1, the melting temperature of the raw material of the transition layer is 1590-1650 ℃. When the raw materials of the transition layer are smelted, the addition amount of the alloy is small, the pouring temperature is increased, the outer layer alloy can be further prevented from being fused into the inner layer to reduce the toughness of the inner layer, the inner layer and the outer layer can be well ensured to be compounded, the high hardness of the outer layer and the high toughness of the inner layer are kept, and the original performances of the multilayer composite layer are further kept when the multilayer composite layer is organically compounded.
Preferably, in step S1, the melting temperature of the raw material of the core part is 1550-.
Preferably, in step S1, a slag removing agent is added to the outer layer molten steel before tapping to perform slag formation.
Preferably, the deslagging agent is perlite sand with the particle size of 25-35 meshes.
Preferably, in step S2, the pouring temperature of the outer layer molten steel is 1380-.
Preferably, in step S2, the pouring temperature of the molten steel of the transition layer is 1480-.
Preferably, in step S2, the pouring temperature of the core molten steel is 28-32 ℃ lower than that of the transition layer molten steel, the rotation speed of the centrifuge is 400-550r/min, and after the pouring is finished, the centrifuge is continued for 2-2.5h under the condition that the rotation speed of the centrifuge is not changed, and then the centrifugation is stopped.
Preferably, in step S3, the annealing time is 20-30h, and the roll collar blank is furnace-cooled after the annealing is completed.
Preferably, in step S3, the quenching time is 15-25 h.
Preferably, the tempering times are 3 times, and the time for each tempering is 30-50 h.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The high-chromium steel composite roll collar comprises an outer layer, a transition layer and a core part, wherein the thicknesses of the outer layer, the transition layer and the core part are all 30 mm.
Wherein the alloy elements of the outer layer comprise the following components in percentage by weight: c: 1.5%, Si: 0.6%, Mn: 1.0%, P0.022%, S0.028%, Cr: 15.0%, Mo: 2.0%, Ni + V: 1.0%, the balance being Fe and unavoidable impurities;
the alloy element composition and the weight percentage of the transition layer are as follows: c: 1.3%, Si: 1.8%, Mn: 0.6 percent of P, 0.02 percent of S, less than or equal to 0.027 percent of S, 0.08 percent of Mo, and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the core part are as follows: c: 1.3%, Si: 1.7%, Mn: 0.5%, P0.025%, S0.012%, Cr 0.18%, Ni: 0.5%, Mo: 0.4%, and the balance of Fe and inevitable impurities.
The manufacturing method of the high-chromium steel composite roll collar comprises the following process steps:
and S1, respectively obtaining raw materials for smelting the outer layer, the transition layer and the core of the high-chromium steel composite roll collar by matching high-quality scrap steel with alloy raw materials, and respectively smelting the raw materials for smelting the outer layer, the transition layer and the core to obtain outer layer molten steel, transition layer molten steel and core molten steel for centrifugally casting the roll collar. Wherein the smelting temperature of the raw material of the outer layer is 1560 ℃, and pearlite sand with the particle size of 25-35 meshes is added into the furnace for slagging treatment before the raw material is smelted out of the furnace; the smelting temperature of the raw material of the transition layer is 1620 ℃, and in the smelting process, rare earth which is 0.2 percent of the mass of the molten steel of the transition layer is added to carry out modification treatment on the molten steel of the transition layer; the melting temperature of the raw materials of the core part is 1580 ℃, and rare earth which is 0.2 percent of the mass of the molten steel of the core part is added in the melting process to carry out modification treatment on the molten steel of the core part.
S2, centrifugally casting the outer layer molten steel at the casting temperature of 1420 ℃, wherein the rotating speed of a centrifugal machine is 500r/min during casting, continuously centrifuging for 8min under the condition that the rotating speed of the centrifugal machine is not changed after the outer layer molten steel is completely cast, and centrifugally casting the transition layer molten steel. And the pouring temperature of the molten steel of the transition layer is 1500 ℃, the rotating speed of the centrifugal machine is 500r/min, after pouring is finished, the molten steel of the core part is further centrifugally poured after continuously centrifuging for 25min under the condition that the rotating speed of the centrifugal machine is not changed. And the pouring temperature of the molten steel of the core part is 30 ℃ lower than that of the molten steel of the transition layer (namely the pouring temperature of the molten steel of the core part is 1470 ℃), the rotating speed of the centrifugal machine is 500r/min, the centrifugal machine is stopped after continuously centrifuging for 2h under the condition of not changing the rotating speed of the centrifugal machine, and the pouring process is finished to obtain the roll collar blank.
S3, adding the centrifugally cast roll collar blank into an empty kiln at the temperature of 650 ℃ under the condition that the roll collar blank is not cooled, then heating to 800 ℃ for annealing for 25 hours, and cooling the roll collar blank along with the furnace after the annealing is finished.
S4, carrying out heat treatment on the annealed roll collar blank by adopting a quenching and tempering mode, wherein the quenching temperature is 900 ℃, and the time is 20 hours; the tempering temperature is 580 ℃, the tempering times are 3 times, the tempering time is 40 hours each time, and the high-chromium steel composite roll collar is obtained after the heat treatment is finished.
Example 2
The high-chromium steel composite roll collar comprises an outer layer, a transition layer and a core, wherein the thickness of the outer layer is 40mm, the thickness of the transition layer is 32mm, and the thickness of the core is 40 mm.
Wherein the alloy elements of the outer layer comprise the following components in percentage by weight: c: 1.22%, Si: 0.41%, Mn: 0.7%, P0.025%, S0.021%, Cr: 12.3%, Mo: 1.1%, Ni + V: 0.52%, the balance being Fe and unavoidable impurities;
the alloy element composition and the weight percentage of the transition layer are as follows: c: 1.23%, Si: 1.5%, Mn: 0.33 percent of Fe, 0.021 percent of P, less than or equal to 0.02 percent of S, 0.12 percent of Mo and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the core part are as follows: c: 1.2%, Si: 1.1.54%, Mn: 0.32%, P0.028%, S0.015%, Cr: 0.14%, Ni: 0: 42%, Mo: 0.3%, and the balance of Fe and inevitable impurities.
The manufacturing method of the high-chromium steel composite roll collar comprises the following process steps:
and S1, respectively obtaining raw materials for smelting the outer layer, the transition layer and the core of the high-chromium steel composite roll collar by matching high-quality scrap steel with alloy raw materials, and respectively smelting the raw materials for smelting the outer layer, the transition layer and the core to obtain outer layer molten steel, transition layer molten steel and core molten steel for centrifugally casting the roll collar. Wherein the smelting temperature of the raw material of the outer layer is 1540 ℃, and before the raw material is smelted out of the furnace, perlite sand with the particle size of 25-35 meshes is added into the furnace for slagging treatment; the smelting temperature of the raw material of the transition layer is 1590 ℃, and during the smelting process, rare earth which is 0.18 percent of the mass of the molten steel of the transition layer is added to modify the molten steel of the transition layer; the melting temperature of the raw material of the core part is 1550 ℃, and rare earth which is 0.18 percent of the mass of the molten steel of the core part is added in the melting process to carry out modification treatment on the molten steel of the core part.
S2, centrifugally casting the outer layer molten steel at 1380 ℃, wherein the rotating speed of the centrifugal machine is 400r/min during casting, continuously centrifuging for 5min under the condition that the rotating speed of the centrifugal machine is not changed after the outer layer molten steel is completely cast, and centrifugally casting the transition layer molten steel. And the pouring temperature of the molten steel of the transition layer is 1480 ℃, the rotating speed of the centrifugal machine is 400r/min, after pouring, the molten steel of the core part is poured centrifugally after continuously centrifuging for 20min under the condition that the rotating speed of the centrifugal machine is not changed. And the pouring temperature of the core molten steel is 28 ℃ lower than that of the transition layer molten steel (namely the pouring temperature of the core molten steel is 1472 ℃), the rotating speed of the centrifugal machine is 400r/min, the centrifugal machine is stopped after continuously centrifuging for 2.5 hours under the condition that the rotating speed of the centrifugal machine is not changed, and the pouring process is finished to obtain the roll collar blank.
S3, adding the centrifugally cast roll collar blank into an empty kiln at the temperature of 600 ℃ under the condition that the roll collar blank is not cooled, then heating to 810 ℃ for annealing for 15 hours, and cooling the roll collar blank along with the furnace after the annealing is finished.
S4, carrying out heat treatment on the annealed roll collar blank in a quenching and tempering mode, wherein the quenching temperature is 950 ℃ and the time is 15 hours; the tempering temperature is 550 ℃, the tempering times are 3 times, the tempering time is 30 hours each time, and the high-chromium steel composite roll collar is obtained after the heat treatment is finished.
Example 3
The high-chromium steel composite roll collar comprises an outer layer, a transition layer and a core part, wherein the thickness of the outer layer is 50mm, the thickness of the transition layer is 40mm, and the thickness of the core part is 60 mm.
Wherein the alloy elements of the outer layer comprise the following components in percentage by weight: c: 1.78%, Si: 0.95%, Mn: 1.19%, P0.028%, S0.025%, Cr: 17.0%, Mo: 3.0%, Ni + V: 1.47%, the balance being Fe and unavoidable impurities;
the alloy element composition and the weight percentage of the transition layer are as follows: c: 1.5%, Si: 2.0%, Mn: 0.97 percent of P, 0.029 percent of S, less than or equal to 0.024 percent of Mo, and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the core part are as follows: c: 1.48%, Si: 1.9%, Mn: 0.9%, P0.019%, S0.026%, Cr 0.2%, Ni: 0.98%, Mo: 0.8%, and the balance of Fe and inevitable impurities.
The manufacturing method of the high-chromium steel composite roll collar comprises the following process steps:
and S1, respectively obtaining raw materials for smelting the outer layer, the transition layer and the core of the high-chromium steel composite roll collar by matching high-quality scrap steel with alloy raw materials, and respectively smelting the raw materials for smelting the outer layer, the transition layer and the core to obtain outer layer molten steel, transition layer molten steel and core molten steel for centrifugally casting the roll collar. Wherein the melting temperature of the raw material of the outer layer is 1580 ℃, and pearlite sand with the particle size of 25-35 meshes is added into the furnace for slagging treatment before the raw material is melted out of the furnace; the smelting temperature of the raw material of the transition layer is 1650 ℃, and rare earth with the mass 0.22 percent of that of the molten steel of the transition layer is added in the smelting process to carry out modification treatment on the molten steel of the transition layer; the melting temperature of the raw materials of the core part is 1620 ℃, and rare earth which is 0.22 percent of the mass of the molten steel of the core part is added in the melting process to carry out modification treatment on the molten steel of the core part.
S2, centrifugally casting the outer layer molten steel at 1480 ℃, wherein the rotational speed of the centrifugal machine is 550r/min during casting, continuously centrifuging for 10min under the condition that the centrifugal rotational speed is not changed after the outer layer molten steel is completely cast, and centrifugally casting the transition layer molten steel. And the pouring temperature of the molten steel of the transition layer is 1520 ℃, the rotating speed of the centrifugal machine is 550r/min, after the pouring is finished, the molten steel of the core part is further centrifugally poured after the centrifugal machine continues to centrifuge for 30min under the condition that the rotating speed of the centrifugal machine is not changed. And the pouring temperature of the molten steel of the core part is 32 ℃ lower than that of the molten steel of the transition layer (namely the pouring temperature of the core part is 1468 ℃), the rotating speed of the centrifugal machine is 550r/min, the centrifugal machine is stopped after continuously centrifuging for 2.5 hours under the condition that the rotating speed of the centrifugal machine is not changed, and the pouring process is finished to obtain the roll collar blank.
S3, adding the centrifugally cast roll collar blank into an empty kiln at 700 ℃ without cooling, then heating to 820 ℃ for annealing for 30 hours, and cooling the roll collar blank along with the furnace after annealing.
S4, carrying out heat treatment on the annealed roll collar blank by adopting a quenching and tempering mode, wherein the quenching temperature is 1000 ℃, and the time is 25 hours; the tempering temperature is 600 ℃, the tempering times are 3 times, the tempering time is 50h, and the high-chromium steel composite roll collar is obtained after the heat treatment is completed.
The high-chromium steel composite roll collar finished products obtained in the examples 1 to 3 have no defect in appearance, the outer layer and the transition layer are organically combined, the transition layer and the inner layer are organically combined, the performances of the high-chromium steel composite roll collar finished products obtained in the examples 1 to 3 are detected, and the detection results are shown in table 1.
TABLE 1
As can be seen from Table 1, the high-chromium steel composite roll obtained in examples 1 to 3 has an outer Cr content of 12.0 to 17.0% by mass, and has high strength, high hardness, small hardness drop and high wear resistance, and the plasticity and toughness of the roll ring are ensured. When the casting method of the three-layer composite layer is used, the organic compounding of the outer layer, the transition layer and the core part of the roll collar can still be realized, the condition that the outer layer and the transition layer or the transition layer and the core part crack in the use process of the roll collar is avoided, and the problem that the roll surface of the roll collar is axially cracked and fails in the use process is solved. Can be used as a vertical roll of a hot strip continuous rolling mill with high quality.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The high-chromium steel composite roll collar is characterized in that: the composite material comprises an outer layer, a transition layer and a core part, wherein the thickness ratio of the outer layer to the transition layer to the core part is 1:0.8-1: 1-1.2;
the alloy elements of the outer layer comprise the following components in percentage by weight: c: 1.2-1.8%, Si: 0.4-1.0%, Mn: 0.6-1.2%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, Cr: 12.0 to 17.0%, Mo: 1.0-3.0%, Ni + V: 0.5-1.5%, the balance being Fe and unavoidable impurities;
the alloy element composition and the weight percentage of the transition layer are as follows: c: 1.2-1.5%, Si: 1.5-2.0%, Mn: 0.3 to 1.0 percent of Fe, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, less than or equal to 0.15 percent of Mo, and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the core part are as follows: c: 1.2-1.5%, Si: 1.5-2.0%, Mn: 0.3-1.0%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, Cr is less than or equal to 0.2%, Ni: 0.4-1.0%, Mo: 0.3-0.8%, and the balance of Fe and inevitable impurities.
2. The method for manufacturing the high-chromium steel composite roll collar of claim 1, which is characterized by comprising the following steps of: the method comprises the following process steps:
s1, respectively smelting the raw materials of the outer layer, the transition layer and the core part to respectively obtain outer layer molten steel, transition layer molten steel and core part molten steel; wherein, in the process of smelting the raw materials of the transition layer, rare earth which is 0.18-0.22% of the mass of the raw materials of the transition layer is added to carry out modification treatment on the molten steel of the transition layer; adding rare earth accounting for 0.18-0.22% of the mass of the raw materials of the core part in the process of smelting the raw materials of the core part, and carrying out modification treatment on the molten steel of the core part;
s2, centrifugally casting the outer layer molten steel, centrifugally casting the transition layer molten steel, and centrifugally casting the core molten steel to obtain a roll collar blank;
s3, adding the uncooled roller ring blank into an empty kiln at the temperature of 600-700 ℃, and then heating to the temperature of 800-820 ℃ for annealing;
s4, carrying out heat treatment on the annealed roller ring blank by adopting a quenching and tempering mode, wherein the quenching temperature is 900-1000 ℃, and the tempering temperature is 550-600 ℃.
3. The method for manufacturing the high-chromium steel composite roll collar as claimed in claim 2, wherein the method comprises the following steps: in the step S1, the smelting temperature of the raw material of the outer layer is 1540-1580 ℃; and/or
In the step S1, the smelting temperature of the raw material of the transition layer is 1590-1650 ℃; and/or
In step S1, the melting temperature of the raw material of the core part is 1550-.
4. The method for manufacturing the high-chromium steel composite roll collar as claimed in claim 2, wherein the method comprises the following steps: in step S1, slag removing agent is added into the outer layer molten steel before tapping to carry out slagging treatment.
5. The method for manufacturing the high-chromium steel composite roll collar as claimed in claim 4, wherein the method comprises the following steps: the deslagging agent is perlite sand with the grain diameter of 25-35 meshes.
6. The method for manufacturing the high-chromium steel composite roll collar as claimed in claim 2, wherein the method comprises the following steps: in step S2, the pouring temperature of the outer layer molten steel is 1380-1480 ℃, the rotating speed of the centrifuge is 400-550r/min, and after the pouring is finished, the centrifuge continues to centrifuge for 5-10min under the condition that the rotating speed of the centrifuge is not changed, and then the transition layer molten steel is poured.
7. The method for manufacturing the high-chromium steel composite roll collar as claimed in claim 2, wherein the method comprises the following steps: in step S2, the pouring temperature of the molten steel of the transition layer is 1480-.
8. The method for manufacturing the high-chromium steel composite roll collar as claimed in claim 2, wherein the method comprises the following steps: in step S2, the pouring temperature of the core molten steel is 28-32 ℃ lower than that of the transition layer molten steel, the rotating speed of the centrifuge is 400-550r/min, and after pouring is finished, the centrifuge is continued to centrifuge for 2-2.5h under the condition that the rotating speed of the centrifuge is not changed, and then the centrifugation is stopped.
9. The method for manufacturing the high-chromium steel composite roll collar as claimed in claim 2, wherein the method comprises the following steps: in step S3, the annealing time is 20-30h, and the roll collar blank is furnace-cooled after the annealing is completed.
10. The method for manufacturing the high-chromium steel composite roll collar as claimed in claim 2, wherein the method comprises the following steps: in the step S3, the quenching time is 15-25 h; and/or
The tempering times are 3 times, and the tempering time is 30-50 h.
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| CN113058694A (en) * | 2021-03-19 | 2021-07-02 | 河北津西钢铁集团重工科技有限公司 | Semi-steel composite roller sleeve and preparation method thereof |
| CN114367538A (en) * | 2021-12-23 | 2022-04-19 | 中钢集团邢台机械轧辊有限公司 | Working roll of temper mill and manufacturing method thereof |
| CN114574779A (en) * | 2022-03-14 | 2022-06-03 | 河北津西钢铁集团重工科技有限公司 | High-alloy slitting roller and preparation method thereof |
| CN114959507A (en) * | 2022-07-27 | 2022-08-30 | 江苏凯达重工股份有限公司 | Tungsten-vanadium alloy tool steel roll collar and preparation method thereof |
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| CN113058694A (en) * | 2021-03-19 | 2021-07-02 | 河北津西钢铁集团重工科技有限公司 | Semi-steel composite roller sleeve and preparation method thereof |
| CN113058694B (en) * | 2021-03-19 | 2022-10-14 | 河北津西钢铁集团重工科技有限公司 | Semi-steel composite roller sleeve and preparation method thereof |
| CN114367538A (en) * | 2021-12-23 | 2022-04-19 | 中钢集团邢台机械轧辊有限公司 | Working roll of temper mill and manufacturing method thereof |
| CN114574779A (en) * | 2022-03-14 | 2022-06-03 | 河北津西钢铁集团重工科技有限公司 | High-alloy slitting roller and preparation method thereof |
| CN114959507A (en) * | 2022-07-27 | 2022-08-30 | 江苏凯达重工股份有限公司 | Tungsten-vanadium alloy tool steel roll collar and preparation method thereof |
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