CN112828256B - Preparation method of heat-crack-resistant cast steel roll collar of section steel rail beam universal mill - Google Patents
Preparation method of heat-crack-resistant cast steel roll collar of section steel rail beam universal mill Download PDFInfo
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- CN112828256B CN112828256B CN202011588417.6A CN202011588417A CN112828256B CN 112828256 B CN112828256 B CN 112828256B CN 202011588417 A CN202011588417 A CN 202011588417A CN 112828256 B CN112828256 B CN 112828256B
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- 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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
Abstract
The invention relates to the technical field of high-performance materials, in particular to a preparation method of a heat-crack-resistant cast steel roll collar of a section steel rail beam universal rolling mill, which comprises the following steps: step A: smelting cast molten steel by adopting an electromagnetic induction furnace, discharging the molten steel from the furnace after the temperature of the molten steel reaches the temperature, and centrifugally casting the molten steel to finish casting; and (B) step (B): unpacking after casting is finished, taking out a blank roll collar, and placing the blank roll collar into a high-temperature resistance furnace for heat preservation; step C: cooling at a speed after heat preservation is finished, and discharging the furnace when the temperature reaches the room temperature; step D: rough machining is carried out on the blank roll collar to obtain a rough machined roll collar, and step E: and plugging the inner hole of the rough machining roll collar by ceramic fibers, and then performing heat treatment. The universal roll collar for the section steel rolling mill, which is prepared by the invention, has the advantages of high wear resistance and good thermal cracking resistance, and is suitable for roll collar products with various thickness requirements.
Description
Technical Field
The invention relates to the technical field of high-performance materials, in particular to a preparation method of a heat-crack-resistant cast steel roll collar of a section steel rail beam universal rolling mill.
Background
Along with the continuous improvement of rolling output and production efficiency of a section steel mill, higher requirements are put forward on the comprehensive performance of the roll collar, and in the prior art, the problems of short machine period and rough roll surface of a lower machine of the conventional semisteel universal roll collar are solved, so that the improvement of the productivity of a section steel rolling line is seriously restricted. The cast steel material has the characteristics of high wear resistance and good thermal cracking resistance, and simultaneously, the special cast steel material and the preparation process are designed aiming at the problems that the outer layer of the universal roll collar of the steel rail beam is large in thickness and cracking is easy to occur in casting and heat treatment procedures; how to design a reasonable chemical composition range of the cast steel universal roll collar and how to determine the preparation process are all keys for developing the cast steel universal roll collar.
Disclosure of Invention
The invention aims to improve the wear resistance of the universal roll collar for the steel rail beam, improve the quality of the roll surface of a roll collar lower machine, improve the quality of a roll and reduce the consumption of the roll.
In order to realize the above technology, the invention provides the following technical scheme:
a preparation method of a heat-crack-resistant cast steel roll collar of a section steel rail beam universal mill comprises the following steps:
step A: smelting molten steel by an electromagnetic induction furnace, discharging the molten steel after the temperature of the molten steel reaches a certain temperature, and centrifugally casting the molten steel in a cavity to finish casting;
and (B) step (B): unpacking after casting for a period of time, taking out the blank roll collar, and rapidly placing the blank roll collar into a high-temperature resistance furnace for heat preservation;
step C: cooling at a certain speed after heat preservation is finished, and discharging the furnace when the temperature reaches the room temperature;
step D: rough machining is carried out on the blank roll collar to obtain a rough machined roll collar, the diameter direction allowance of the outer circle of the roll collar is 10-20 mm, the diameter direction allowance of the inner hole is 20-30 mm, and the height direction allowance is 10-20 mm;
step E: the inner hole of the rough machining roll collar is plugged by ceramic fiber, and then heat treatment is carried out.
The technical scheme of the invention is further improved as follows: and (C) discharging the outer layer casting molten steel in the step A when the temperature of the outer layer casting molten steel reaches 1600-1650 ℃, and performing centrifugal casting at 1400-1450 ℃.
The technical scheme of the invention is further improved as follows: and in the step A, centrifugal casting is performed layer by layer in three layers, and the components of the outer layer, the middle layer and the core molten steel are consistent.
The technical scheme of the invention is further improved as follows: the roll collar in the step A can be one-out or multiple-out (namely, one cast and cut into multiple cut).
The technical scheme of the invention is further improved as follows: and B, opening the box after pouring is completed for 10-15 hours, and placing the blank roll collar in a red-hot state into a high-temperature resistance furnace for heat preservation within 30 minutes.
The technical scheme of the invention is further improved as follows: the heat preservation temperature in the step B is 650-850 ℃ and the heat preservation time is 30-50h; or after pouring for 100-150h, opening the box by cooling, placing the box into a high-temperature furnace, heating to 650-850 ℃ at a heating rate of 10-30 ℃/h, and preserving heat.
The technical scheme of the invention is further improved as follows: and C, cooling and slow cooling at a speed of 5-15 ℃/h.
The technical scheme of the invention is further improved as follows: the heat treatment step in the step E is as follows: heating at 1000-1100 deg.c for 5-15 hr, discharging from the furnace after heat preservation, spraying for 30-60 min to 500-530 deg.c, air cooling to 400-500 deg.c, and tempering.
The technical scheme of the invention is further improved as follows: and E, tempering at 500-580 ℃ for 30-60h, and continuously tempering for 2-3 times.
The utility model provides a heat crack resistant cast steel roller ring of universal rolling mill of shaped steel rail roof beam, the steel roller ring is overall structure, divides three-layer centrifugal casting, and the material is cast steel, and the chemical composition scope: c:1.50 to 2.10, si:0.30 to 1.00, mn:0.50 to 1.20, P is less than or equal to 0.05, S is less than or equal to 0.05, cr:5.00 to 8.00, ni:0.50 to 1.80, mo: 1.00-8.00, V: less than or equal to 5.00, and other impurity elements Cu+Mg+Ti less than or equal to 0.50.
Compared with the prior art, the preparation method of the heat-crack-resistant cast steel roll collar of the section steel rail beam universal rolling mill has the following beneficial effects:
1. the invention provides a preparation method of a heat-crack-resistant cast steel roll collar of a steel rail beam universal mill, which optimizes and improves a universal roll collar manufacturing mode according to the use condition of the universal roll collar, and the centrifugal layered casting is adopted, but the outer layer middle layer and the core component are both centrifugally cast by adopting the same component, so that the situation that the thickness of the core component is insufficient due to the back corrosion of the outer layer molten steel and further the later use performance is affected is integrally avoided, and further, the roll collar component integration also enables the roll collar to be produced by adopting one-step production of a plurality of roll collars, and the component integration solves the use problems of uneven wear resistance and the like of the side wall caused by the substandard component of the side wall which appears in the conventional composite production mode.
2. The invention provides a preparation method of a heat-crack-resistant cast steel roll collar of a steel rail beam universal mill, which is characterized in that compared with a conventional semisteel roll collar, the newly designed cast steel roll collar has the advantages that the wear resistance is greatly improved, and the conditions of rough surface, meat falling and the like of the roll collar at the early stage are avoided.
3. The invention provides a preparation method of a heat-crack-resistant cast steel roll collar of a section steel rail beam universal mill, which adopts primary heat treatment of blank annealing to ensure high toughness of a core part, adopts a quenching and tempering mode for final heat treatment, ensures high wear resistance of a working layer, ensures good toughness of the core part, ensures bearing of interference assembly force during assembly and bearing of torque and roll bending force during use, and finally researches the cast steel universal roll collar by protecting an inner hole in time during the heat treatment, reasonably selecting a heat treatment process and the like.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a metallographic image of a cast steel universal roll collar of the present invention at 500 x magnification.
Detailed Description
The technical scheme of the present invention will be clearly and completely described in the following detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A preparation method of a heat-crack-resistant cast steel roll collar of a section steel rail beam universal mill comprises the following steps:
step A: smelting molten steel by an electromagnetic induction furnace, discharging the molten steel after the temperature of the molten steel reaches a certain temperature, and centrifugally casting the molten steel in a cavity to finish casting;
and (B) step (B): unpacking after casting for a period of time, taking out the blank roll collar, and rapidly placing the blank roll collar into a high-temperature resistance furnace for heat preservation;
step C: cooling at a certain speed after heat preservation is finished, and discharging the furnace when the temperature reaches the room temperature;
step D: rough machining is carried out on the blank roll collar to obtain a rough machined roll collar, the diameter direction allowance of the outer circle of the roll collar is 10-20 mm, the diameter direction allowance of the inner hole is 20-30 mm, and the height direction allowance is 10-20 mm;
step E: the inner hole of the rough machining roll collar is plugged by ceramic fiber, and then heat treatment is carried out.
Preferably: and (C) discharging the outer layer casting molten steel in the step A when the temperature of the outer layer casting molten steel reaches 1600-1650 ℃, and performing centrifugal casting at 1400-1450 ℃.
Preferably: and in the step A, centrifugal casting is performed layer by layer in three layers, and the components of the outer layer, the middle layer and the core molten steel are consistent.
Preferably: the roll collar in the step A can be one-out or multiple-out (namely, one cast and cut into multiple cut).
Preferably: and B, opening the box after pouring is completed for 10-15 hours, and placing the blank roll collar in a red-hot state into a high-temperature resistance furnace for heat preservation within 30 minutes.
Preferably: the heat preservation temperature in the step B is 650-850 ℃ and the heat preservation time is 30-50h; or after pouring for 100-150h, opening the box by cooling, placing the box into a high-temperature furnace, heating to 650-850 ℃ at a heating rate of 10-30 ℃/h, and preserving heat.
Preferably: and C, cooling and slow cooling at a speed of 5-15 ℃/h.
Preferably: the heat treatment step in the step E is as follows: heating at 1000-1100 deg.c for 5-15 hr, discharging from the furnace after heat preservation, spraying for 30-60 min to 500-530 deg.c, air cooling to 400-500 deg.c, and tempering.
Preferably: and E, tempering at 500-580 ℃ for 30-60h, and continuously tempering for 2-3 times.
The utility model provides a heat crack resistant cast steel roller ring of universal rolling mill of shaped steel rail roof beam, the steel roller ring is overall structure, divides three-layer centrifugal casting, and the material is cast steel, and the chemical composition scope: c:1.50 to 2.10, si:0.30 to 1.00, mn:0.50 to 1.20, P is less than or equal to 0.05, S is less than or equal to 0.05, cr:5.00 to 8.00, ni:0.50 to 1.80, mo: 1.00-8.00, V: less than or equal to 5.00, and other impurity elements Cu+Mg+Ti less than or equal to 0.50.
Smelting molten steel by an electromagnetic induction furnace, discharging the molten steel when the temperature of the molten steel reaches 1600-1650 ℃, and performing centrifugal casting when the temperature of the molten steel reaches 1400-1450 ℃, wherein the molten steel is cast in three layers, and the components of the outer layer, the middle layer and the core are consistent; opening the box after pouring for 10-15 h, placing the blank roll collar in a red hot state into a high-temperature resistance furnace for heat preservation within 30min, wherein the heat preservation temperature is 650-850 ℃, the heat preservation time is 30-50h, cooling at a speed of 5-15 ℃/h after heat preservation is finished, and discharging the furnace when the roll temperature reaches room temperature; rough machining is carried out on the blank roll collar, the diameter direction allowance of the outer circle of the roll collar is 10-20 mm, the diameter direction allowance of the inner hole is 20-30 mm, and the height direction allowance is 10-20 mm; performing heat treatment on the rough-machined roll collar, plugging an inner hole of the roll collar by ceramic fibers before the heat treatment, heating at the temperature of 1000-1100 ℃ for 5-15 hours, discharging after the heat preservation is finished, spraying for 30-60 minutes until the surface temperature of the roll collar is 500-530 ℃, air-cooling to 400-500 ℃, and then charging and tempering; tempering temperature is 500-580 ℃, heat preservation time is 30-60h, and tempering is continuously carried out for 2-3 times.
The invention is further illustrated by the following examples:
example 1
Smelting molten steel by adopting an electromagnetic induction furnace, discharging the molten steel when the temperature of the molten steel reaches 1630 ℃, performing centrifugal casting when the temperature of the molten steel reaches 1420 ℃, performing secondary casting when the temperature of a cavity reaches 1130 ℃, performing tertiary casting when the temperature of the cavity reaches 1120 ℃, tapping after the molten steel poured for the secondary and tertiary casting is performed, wherein the tapping temperature is 1680 ℃, and the pouring temperature is 1425 ℃. The actual outer layer chemical composition: c:1.52, si:0.36, mn:0.62, P:0.032, S:0.021, cr:5.62, ni:0.92, mo:2.36, v:3.30. and opening the box after 13 hours of casting, placing the blank roll collar in a red and hot state into a high-temperature resistance furnace for heat preservation within 30 minutes, wherein the heat preservation temperature is 750 ℃, the heat preservation time is 35 hours, cooling at a speed of 10 ℃/h after heat preservation is finished, and discharging the furnace when the roll temperature reaches the room temperature. Rough machining is carried out on the blank roll collar, the diameter direction allowance of the outer circle of the roll collar is 15mm, the diameter direction allowance of the inner hole is 25mm, and the height direction allowance is 15mm. And (3) performing heat treatment on the rough-machined roll collar, plugging an inner hole of the roll collar by using ceramic fibers before the heat treatment, heating at 1030 ℃ for 12 hours, discharging after the heat preservation is finished, spraying for 40 minutes to the surface temperature of the roll collar at 500 ℃, air-cooling to 455 ℃, and charging and tempering. Tempering temperature is 530 ℃, heat preservation time is 45h, and tempering is continuously carried out for 2 times.
Fig. 1 is a microstructure picture of a cast steel roll collar of example 1, wherein a white phase is carbide, and the carbide is uniformly distributed, and the microstructure is martensite, residual austenite and carbide, so that the strength of a pearlite matrix is obviously improved compared with that of semisteel. Under the condition of 500 times of amplification, the carbide is more uniform than semisteel carbide, and the matrix has high microscopic strength, so that the wear resistance of the material is improved.
Example 2
Smelting molten steel by adopting an electromagnetic induction furnace, discharging the molten steel when the temperature of the molten steel reaches 1645 ℃, performing centrifugal casting when the temperature of the molten steel reaches 1420 ℃, performing secondary casting when the temperature of a cavity reaches 1130 ℃, performing tertiary casting when the temperature of the cavity reaches 1125 ℃, tapping after the molten steel poured for the secondary and tertiary casting is performed, wherein the tapping temperature is 1675 ℃ and the pouring temperature is 1426 ℃. The actual outer layer chemical composition: c:1.55, si:0.39, mn:0.65, P:0.036, S:0.025, cr:6.62, ni:0.93, mo:1.95, V:2.9. and opening the box after pouring for 15 hours, placing the blank roll collar in a red and hot state into a high-temperature resistance furnace for heat preservation within 25 minutes, wherein the heat preservation temperature is 800 ℃, the heat preservation time is 40 hours, cooling at a speed of 8 ℃/h after heat preservation is finished, and discharging the furnace when the roll temperature reaches the room temperature. Rough machining is carried out on the blank roll collar, the diameter direction allowance of the outer circle of the roll collar is 16mm, the diameter direction allowance of the inner hole is 26mm, and the height direction allowance is 13mm. And (3) performing heat treatment on the rough-machined roll collar, plugging an inner hole of the roll collar by using ceramic fibers before the heat treatment, heating at 1050 ℃, keeping the temperature for 13h, discharging after the heat preservation is finished, spraying for 45min to the surface temperature of the roll collar, air-cooling at 510 ℃, air-cooling to 456 ℃, and charging and tempering. Tempering temperature is 520 ℃, heat preservation time is 50h, and tempering is continuously carried out for 3 times.
Example 3
Smelting molten steel by adopting an electromagnetic induction furnace, discharging the molten steel when the temperature of the molten steel reaches 1650 ℃, performing centrifugal casting when the temperature of the molten steel reaches 1430 ℃, performing secondary casting when the temperature of a cavity reaches 1120 ℃, performing tertiary casting when the temperature of the cavity reaches 1123 ℃, tapping after the molten steel poured for the secondary and tertiary casting is performed, wherein the tapping temperature is 1672 ℃ and the pouring temperature is 1422 ℃. The actual outer layer chemical composition: c:1.65, si:0.59, mn:0.68, P:0.036, S:0.029, cr:6.52, ni:0.83, mo:1.93, v:2.85. and opening the box after 13 hours of casting, placing the blank roll collar in a red and hot state into a high-temperature resistance furnace for heat preservation within 28 minutes, wherein the heat preservation temperature is 820 ℃, the heat preservation time is 38 hours, cooling at a speed of 7 ℃/h after heat preservation is finished, and discharging the furnace when the roll temperature reaches the room temperature. Rough machining is carried out on the blank roll collar, the diameter direction allowance of the outer circle of the roll collar is 15mm, the diameter direction allowance of the inner hole is 25mm, and the height direction allowance is 13mm. And (3) performing heat treatment on the rough-machined roll collar, plugging an inner hole of the roll collar by using ceramic fibers before the heat treatment, heating at 1050 ℃, keeping the temperature for 13h, discharging after the heat preservation is finished, spraying for 43min to the surface temperature of the roll collar at 500 ℃, performing air cooling to 453 ℃, and charging and tempering. Tempering temperature is 530 ℃, heat preservation time is 45h, and tempering is continuously carried out for 2 times.
Example 4
Smelting molten steel by adopting an electromagnetic induction furnace, discharging the molten steel when the temperature of the molten steel reaches 1630 ℃, performing centrifugal casting when the temperature of the molten steel reaches 1430 ℃, performing secondary casting when the temperature of a cavity reaches 1130 ℃, performing tertiary casting when the temperature of the cavity reaches 1122 ℃, tapping after the molten steel poured for the secondary and tertiary casting is performed, wherein the tapping temperature is 1671 ℃ and the pouring temperature is 1421 ℃. The actual outer layer chemical composition: c:1.61, si:0.55, mn:0.68, P:0.032, S:0.025, cr:6.32, ni:0.93, mo:1.91, v:2.83. and (3) opening the box after pouring for 12 hours, placing the blank roll collar in a red and hot state into a high-temperature resistance furnace for heat preservation within 27 minutes, wherein the heat preservation temperature is 830 ℃, the heat preservation time is 37 hours, cooling at a speed of 8 ℃/h after heat preservation, and discharging the furnace when the roll temperature reaches the room temperature. Rough machining is carried out on the blank roll collar, the diameter direction allowance of the outer circle of the roll collar is 13mm, the diameter direction allowance of the inner hole is 26mm, and the height direction allowance is 12mm. And (3) performing heat treatment on the rough-machined roll collar, plugging an inner hole of the roll collar by using ceramic fibers before the heat treatment, heating at 1030 ℃ for 12 hours, discharging after the heat preservation is finished, spraying for 46 minutes to the surface temperature of the roll collar at 520 ℃, air-cooling to 456 ℃, and charging and tempering. Tempering temperature is 525 ℃, the heat preservation time is 50h, and tempering is continuously carried out for 2 times.
Example 5
Smelting molten steel by adopting an electromagnetic induction furnace, discharging the molten steel when the temperature of the molten steel reaches 1625 ℃, performing centrifugal casting when the temperature of the molten steel reaches 1450 ℃, performing secondary casting when the temperature of a cavity reaches 1125 ℃, performing tertiary casting when the temperature of the cavity reaches 1123 ℃, tapping after the molten steel poured for the secondary and tertiary casting is finished, wherein the tapping temperature is 1670 ℃ and the pouring temperature is 1425 ℃. The actual outer layer chemical composition: c:1.53, si:0.57, mn:0.69, P:0.031, S:0.026, cr:6.32, ni:0.91, mo:1.96, v:2.81. and opening the box after pouring for 11 hours, placing the blank roll collar in a red and hot state into a high-temperature resistance furnace for heat preservation within 30 minutes, wherein the heat preservation temperature is 820 ℃, the heat preservation time is 36 hours, cooling at a speed of 9 ℃/h after heat preservation is finished, and discharging the furnace when the roll temperature reaches the room temperature. Rough machining is carried out on the blank roll collar, the diameter direction allowance of the outer circle of the roll collar is 15mm, the diameter direction allowance of the inner hole is 28mm, and the height direction allowance is 15mm. And (3) performing heat treatment on the rough-machined roll collar, plugging an inner hole of the roll collar by using ceramic fibers before heat treatment, heating at 1030 ℃ for 13h, discharging after heat preservation, spraying for 50min to 525 ℃ of the surface temperature of the roll collar, air-cooling to 430 ℃ and charging and tempering. Tempering temperature is 530 ℃, the heat preservation time is 40h, and tempering is continuously carried out for 3 times.
Example 6
Smelting molten steel by adopting an electromagnetic induction furnace, discharging the molten steel when the temperature of the molten steel reaches 1623 ℃, performing centrifugal casting when the temperature of the molten steel reaches 1453 ℃, performing secondary casting when the temperature of a cavity reaches 1125 ℃, performing tertiary casting when the temperature of the cavity reaches 1125 ℃, tapping after the molten steel poured for the secondary and tertiary casting is finished, wherein the tapping temperature is 1673 ℃ and the pouring temperature is 1420 ℃. The actual outer layer chemical composition: c:1.51, si:0.56, mn:0.68, P:0.030, S:0.016, cr:5.32, ni:0.91, mo:1.96, v:2.71. and opening the box after 13 hours of casting, placing the blank roll collar in a red and hot state into a high-temperature resistance furnace for heat preservation within 30 minutes, wherein the heat preservation temperature is 810 ℃, the heat preservation time is 35 hours, cooling at a speed of 8 ℃/h after heat preservation is finished, and discharging the furnace when the roll temperature reaches the room temperature. Rough machining is carried out on the blank roll collar, the diameter direction allowance of the outer circle of the roll collar is 13mm, the diameter direction allowance of the inner hole is 27mm, and the height direction allowance is 15mm. And (3) performing heat treatment on the rough-machined roll collar, plugging an inner hole of the roll collar by using ceramic fibers before the heat treatment, heating at 1050 ℃, keeping the temperature for 11 hours, discharging after the heat preservation is finished, spraying for 45 minutes to the surface temperature of the roll collar at 520 ℃, air-cooling to 435 ℃, and charging and tempering. Tempering temperature is 535 ℃, heat preservation time is 45h, and tempering is continuously carried out for 3 times.
The comparative examples are shown below:
comparative example 1 is a conventional semisteel roll collar; sample tensile mechanical property detection is carried out on the products of the examples 1 to 6 and the comparative example 1, and the performance detection is carried out in national standard GB/T1503-2008. The test results are shown in Table 1:
example product tensile mechanical Property detection results
Through performance comparison of the cast steel roll collar and the semisteel roll collar, the macroscopic hardness of the cast steel roll collar is found to be higher than 30%, the relative wear resistance of the service performance is represented, the relative wear resistance of the cast steel roll collar can reach more than 2.5 times of that of the semisteel roll collar, and the service life is greatly prolonged. From laboratory detection data, the cast steel roller ring has obviously increased hot crack resistance compared with semisteel, and the roller surface state obviously optimizes the conventional semisteel roller ring; according to the performance detection result, the performance of the cast steel roll collar is greatly improved compared with that of a semisteel roll collar.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the design of the present invention.
Claims (4)
1. A preparation method of a heat-crack-resistant cast steel roll collar of a section steel rail beam universal rolling mill is characterized by comprising the following steps:
step A: smelting molten steel by an electromagnetic induction furnace, discharging after the temperature of the molten steel reaches a certain temperature, centrifugally casting the molten steel in a cavity, and completing casting, wherein the centrifugal casting is divided into three layers, namely casting layer by layer, and the components of the outer layer, the middle layer and the core are consistent; the chemical composition range is as follows: c:1.50 to 2.10, si:0.30 to 1.00, mn:0.50 to 1.20, P is less than or equal to 0.05, S is less than or equal to 0.05, cr:5.00 to 8.00, ni:0.50 to 1.80, mo: 1.00-8.00, V: less than or equal to 5.00, and less than or equal to 0.50 of other impurity elements Cu+Mg+Ti;
and (B) step (B): unpacking after pouring for 10-15 h, and placing the blank roll collar in a red-hot state into a high-temperature resistance furnace for heat preservation within 30min, wherein the heat preservation temperature is 650-850 ℃ and the heat preservation time is 30-50h; or after pouring for 100-150h, opening the box by cooling, putting the box into a high-temperature furnace, heating to 650-850 ℃ at a heating rate of 10-30 ℃/h, and preserving heat;
step C: cooling at a certain speed after heat preservation is finished, and discharging after the temperature reaches room temperature;
step D: rough machining is carried out on the blank roll collar to obtain a rough machined roll collar, the diameter direction allowance of the outer circle of the roll collar is 10-20 mm, the diameter direction allowance of the inner hole is 20-30 mm, and the height direction allowance is 10-20 mm;
step E: plugging the inner hole of the rough machining roller ring by ceramic fiber, and then performing heat treatment, wherein the heat treatment steps are as follows: heating at 1000-1100 deg.c for 5-15 hr, spraying for 30-60 min to 500-530 deg.c, air cooling to 400-500 deg.c, and tempering at 500-580 deg.c for 30-60 hr for 2-3 times.
2. The method for preparing the heat-crack-resistant cast steel roll collar of the steel rail beam universal mill, which is characterized in that: and (C) discharging the outer layer casting molten steel in the step A when the temperature of the outer layer casting molten steel reaches 1600-1650 ℃, and performing centrifugal casting at 1400-1450 ℃.
3. The method for preparing the heat-crack-resistant cast steel roll collar of the steel rail beam universal mill, which is characterized in that: the steel roll collar in the step A can be cut into a plurality of branches in a one-out-one mode or a one-out-multiple-in-one-casting mode.
4. The method for preparing the heat-crack-resistant cast steel roll collar of the steel rail beam universal mill, which is characterized in that: and C, cooling and slow cooling at a speed of 5-15 ℃/h.
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| CN114369706B (en) * | 2021-12-15 | 2023-08-29 | 中钢集团邢台机械轧辊有限公司 | HW steel horizontal roll collar heat treatment spray quenching device and heat treatment method thereof |
| CN114367649B (en) * | 2021-12-16 | 2024-04-05 | 中钢集团邢台机械轧辊有限公司 | Preparation method of high-speed steel working roller for hot rolled strip finish rolling |
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