CN112828256A - Preparation method of hot-cracking-resistant cast steel roll collar of section steel rail beam universal mill - Google Patents
Preparation method of hot-cracking-resistant cast steel roll collar of section steel rail beam universal mill Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- 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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- 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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- C21D6/00—Heat treatment of ferrous alloys
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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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- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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- 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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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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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- 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
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- 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
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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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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Abstract
The invention relates to the technical field of high-performance materials, in particular to a preparation method of a hot-cracking-resistant cast steel roll collar of a section steel rail beam universal mill, which comprises the following steps: step A: smelting cast molten steel by using 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: opening the box after the pouring is finished, taking out the blank roll collar, and putting the blank roll collar into a high-temperature resistance furnace for heat preservation; and C: cooling at a speed after the heat preservation is finished, and unloading the furnace when the temperature reaches the room temperature; step D: and E, rough machining the blank roll collar to obtain a rough machined roll collar, and step E: and plugging the inner hole of the rough-machined roll collar by using ceramic fibers, and then carrying out heat treatment. The universal roll collar for the section steel rolling mill 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 hot-cracking-resistant cast steel roll collar of a section steel rail beam universal mill.
Background
With the continuous improvement of the rolling yield and the production efficiency of a section steel factory, 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 lower machine roll surface of the conventional semi-steel universal roll collar are caused, 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 meanwhile, the special cast steel material and the preparation process need to be designed for the universal roll collar aiming at the problems that the outer layer of the universal roll collar of the profile steel rail beam is large in thickness and the universal roll collar is easy to crack in the casting and heat treatment processes; how to design a reasonable chemical component range of the cast steel universal roll collar and how to determine a preparation process are all the 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 section steel rail beam, improve the quality of the lower machine roll surface of the roll collar, improve the quality of a roll and reduce the consumption of the roll.
In order to realize the technology, the invention provides the following technical scheme:
a method for preparing a hot-cracking-resistant cast steel roll collar of a section steel rail beam universal mill comprises the following steps:
step A: smelting cast molten steel by using an electromagnetic induction furnace, discharging the molten steel after the temperature of the molten steel reaches a certain temperature, and centrifugally pouring the molten steel in a cavity to finish pouring;
and B: opening the box after a period of time after the pouring is finished, taking out the blank roll collar, and quickly putting the blank roll collar into a high-temperature resistance furnace for heat preservation;
and C: cooling at a certain speed after the heat preservation is finished, and unloading the furnace when the temperature reaches the room temperature;
step D: carrying out rough machining on the blank roll collar to obtain a rough machined roll collar, wherein the allowance of the roll collar in the diameter direction of the excircle is 10-20 mm, the allowance of the roll collar in the diameter direction of the inner hole is 20-30 mm, and the allowance of the roll collar in the height direction is 10-20 mm;
step E: the inner hole of the rough-machined 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 cast steel in the step A when the temperature of the outer layer cast steel reaches 1600-1650 ℃, and carrying out centrifugal casting at 1400-1450 ℃.
The technical scheme of the invention is further improved as follows: and in the step A, centrifugal casting is divided into three layers and is performed layer by layer, and the molten steel components of the outer layer, the middle layer and the core part are consistent.
The technical scheme of the invention is further improved as follows: the roll rings in the step A can be performed in a one-out mode or a multiple-out mode (i.e. one roll ring is poured and cut into multiple rolls).
The technical scheme of the invention is further improved as follows: and C, opening the box after the pouring in the step B is finished for 10-15 hours, and putting the blank roll collar in a red hot state into a high-temperature resistance furnace for heat preservation within 30 min.
The technical scheme of the invention is further improved as follows: in the step B, the heat preservation temperature is 650-850 ℃, and the heat preservation time is 30-50 h; or after the pouring is finished for 100-150h, the box is opened in a cold mode, and the box is placed into a high-temperature furnace to be heated to 650-850 ℃ at the heating rate of 10-30 ℃/h for heat preservation.
The technical scheme of the invention is further improved as follows: and C, cooling slowly at the 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 ℃, keeping the temperature for 5-15 h, discharging after keeping the temperature, spraying for 30-60 min until the surface temperature of the roll collar is 500-530 ℃, air cooling to 400-500 ℃, and then loading into a furnace for tempering.
The technical scheme of the invention is further improved as follows: and E, tempering at 500-580 ℃, keeping the temperature for 30-60h, and continuously tempering for 2-3 times.
The utility model provides a section steel rail roof beam universal mill hot crack resistant cast steel collar, the steel collar is overall structure, divides three-layer centrifugal casting, and the material is cast steel, chemical composition scope: c: 1.50-2.10, Si: 0.30 to 1.00, Mn: 0.50-1.20, P is less than or equal to 0.05, S is less than or equal to 0.05, Cr: 5.00-8.00, Ni: 0.50 to 1.80, Mo: 1.00-8.00, V: less than or equal to 5.00 percent, and less than or equal to 0.50 percent of other impurity elements of Cu, Mg and Ti.
Compared with the prior art, the preparation method of the hot-cracking-resistant cast steel roll collar of the section steel rail beam universal mill provided by the invention has the following beneficial effects:
1. the invention provides a method for preparing a hot-cracking-resistant cast steel roll collar of a profile steel rail beam universal rolling mill, which optimizes and improves the manufacturing mode of the universal roll collar according to the using conditions of the universal roll collar, wherein the components of an outer-layer middle layer and a core part are centrifugally poured by the same components although centrifugal layered pouring is adopted, so that the condition that the later-stage use performance is influenced due to insufficient thickness caused by the reverse corrosion of core molten steel on the outer-layer molten steel is avoided due to the integrated components of the roll collar, and further, the roll collar is possible to be produced by adopting a plurality of roll collars at one time due to the integrated components, and the problem of non-wear resistance and the like caused by the unqualified components of the side wall in the conventional composite production mode is solved due to the.
2. Compared with the conventional semi-steel roll collar, the newly designed cast steel roll collar has greatly improved wear resistance, and avoids the situations of rough surface, meat falling and the like in the early stage of the roll collar.
3. The invention provides a method for preparing a hot-cracking-resistant cast steel roll collar of a section steel rail beam universal rolling mill, which adopts one-time heat treatment of blank annealing to ensure high toughness of a core part, and adopts a quenching and tempering mode for final heat treatment, thereby not only ensuring high wear resistance of a working layer, but also ensuring good toughness of the core part, ensuring that interference assembly force and torque and roll bending force borne in the use process are borne during assembly, and finally researching the cast steel universal roll collar by timely protecting an inner hole in the heat treatment process, reasonably selecting a heat treatment process and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a metallographic picture magnified 500 times for the cast steel universal roll collar of the present invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described by the following detailed description. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method for preparing a hot-cracking-resistant cast steel roll collar of a section steel rail beam universal mill comprises the following steps:
step A: smelting cast molten steel by using an electromagnetic induction furnace, discharging the molten steel after the temperature of the molten steel reaches a certain temperature, and centrifugally pouring the molten steel in a cavity to finish pouring;
and B: opening the box after a period of time after the pouring is finished, taking out the blank roll collar, and quickly putting the blank roll collar into a high-temperature resistance furnace for heat preservation;
and C: cooling at a certain speed after the heat preservation is finished, and unloading the furnace when the temperature reaches the room temperature;
step D: carrying out rough machining on the blank roll collar to obtain a rough machined roll collar, wherein the allowance of the roll collar in the diameter direction of the excircle is 10-20 mm, the allowance of the roll collar in the diameter direction of the inner hole is 20-30 mm, and the allowance of the roll collar in the height direction is 10-20 mm;
step E: the inner hole of the rough-machined roll collar is plugged by ceramic fiber, and then heat treatment is carried out.
Preferably: and C, discharging the outer layer cast steel in the step A when the temperature of the outer layer cast steel reaches 1600-1650 ℃, and carrying out centrifugal casting at 1400-1450 ℃.
Preferably: and in the step A, centrifugal casting is divided into three layers and is performed layer by layer, and the molten steel components of the outer layer, the middle layer and the core part are consistent.
Preferably: the roll rings in the step A can be performed in a one-out mode or a multiple-out mode (i.e. one roll ring is poured and cut into multiple rolls).
Preferably: and C, opening the box after the pouring in the step B is finished for 10-15 hours, and putting the blank roll collar in a red hot state into a high-temperature resistance furnace for heat preservation within 30 min.
Preferably: in the step B, the heat preservation temperature is 650-850 ℃, and the heat preservation time is 30-50 h; or after the pouring is finished for 100-150h, the box is opened in a cold mode, and the box is placed into a high-temperature furnace to be heated to 650-850 ℃ at the heating rate of 10-30 ℃/h for heat preservation.
Preferably: and C, cooling slowly at the speed of 5-15 ℃/h.
Preferably: the heat treatment step in the step E is as follows: heating at 1000-1100 ℃, keeping the temperature for 5-15 h, discharging after keeping the temperature, spraying for 30-60 min until the surface temperature of the roll collar is 500-530 ℃, air cooling to 400-500 ℃, and then loading into a furnace for tempering.
Preferably: and E, tempering at 500-580 ℃, keeping the temperature for 30-60h, and continuously tempering for 2-3 times.
The utility model provides a section steel rail roof beam universal mill hot crack resistant cast steel collar, the steel collar is overall structure, divides three-layer centrifugal casting, and the material is cast steel, chemical composition scope: c: 1.50-2.10, Si: 0.30 to 1.00, Mn: 0.50-1.20, P is less than or equal to 0.05, S is less than or equal to 0.05, Cr: 5.00-8.00, Ni: 0.50 to 1.80, Mo: 1.00-8.00, V: less than or equal to 5.00 percent, and less than or equal to 0.50 percent of other impurity elements of Cu, Mg and Ti.
Smelting molten steel by using an electromagnetic induction furnace, discharging the molten steel when the temperature of the molten steel reaches 1600-1650 ℃, carrying out centrifugal casting when the temperature of the molten steel reaches 1400-1450 ℃, and carrying out three-layer casting, wherein the molten steel components of an outer layer, an intermediate layer and a core are consistent; opening the box after the pouring is finished 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 is carried out at the speed of 5-15 ℃/h after the heat preservation is finished, and the furnace can be unloaded when the roll temperature reaches the room temperature; rough machining is carried out on a blank roll collar, the allowance of the roll collar in the diameter direction of the excircle is 10-20 mm, the allowance of the roll collar in the diameter direction of the inner hole is 20-30 mm, and the allowance of the roll collar in the height direction is 10-20 mm; carrying out 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 the temperature of 1000-1100 ℃, keeping the temperature for 5-15 h, discharging from the furnace after heat preservation is finished, spraying for 30-60 min until the surface temperature of the roll collar is 500-530 ℃, air cooling to 400-500 ℃, and then loading into the furnace for tempering; the tempering temperature is 500-580 ℃, the heat preservation time is 30-60 hours, and the continuous tempering is carried out for 2-3 times.
The present invention will be described in further detail with reference to the following examples:
example 1
The method comprises the following steps of smelting molten steel by using an electromagnetic induction furnace, discharging the molten steel when the temperature of the molten steel reaches 1630 ℃, carrying out centrifugal casting when the temperature of the molten steel reaches 1420 ℃, carrying out secondary casting when the temperature of a cavity reaches 1130 ℃, carrying out third casting when the temperature of the cavity reaches 1120 ℃, carrying out tapping when the casting of the molten steel of the first casting of the second and third molten steel is finished, wherein the tapping temperature is 1680 ℃, and the casting temperature is 1425 ℃. 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. opening the box after the pouring is finished for 13h, 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 750 ℃, the heat preservation time is 35h, cooling is carried out at the speed of 10 ℃/h after the heat preservation is finished, and the furnace can be unloaded when the roll temperature reaches the room temperature. And (4) roughly processing the blank roll collar, wherein the allowance of the roll collar in the excircle diameter direction is 15mm, the allowance of the roll collar in the inner hole diameter direction is 25mm, and the allowance of the roll collar in the height direction is 15 mm. And (3) carrying out 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 12h, discharging from the furnace after heat preservation is finished, spraying for 40min till the surface temperature of the roll collar is 500 ℃, air cooling till 455 ℃, charging into the furnace and tempering. Tempering temperature is 530 ℃, the heat preservation time is 45h, and continuous tempering is carried out for 2 times.
FIG. 1 is a picture of the microstructure of the cast steel roll collar of example 1, wherein a white phase is carbide, and it can be seen from the picture that the carbide is uniformly distributed, the microstructure is martensite and residual austenite + carbide, and the strength of the matrix is obviously improved compared with the semi-steel pearlite matrix. Under the condition of amplifying by 500 times, the carbide is more uniform than semi-steel carbide, the matrix has high micro-strength, and the material wear resistance is favorably improved.
Example 2
The method comprises the following steps of smelting molten steel by using an electromagnetic induction furnace, discharging when the temperature of the molten steel reaches 1645 ℃, carrying out centrifugal casting when the temperature of the molten steel reaches 1420 ℃, carrying out secondary casting when the temperature of a cavity reaches 1130 ℃, carrying out tertiary casting when the temperature of the cavity reaches 1125 ℃, carrying out tapping when the molten steel for the secondary casting and the tertiary casting are cast for the first time, wherein the tapping temperature is 1675 ℃, and the casting temperature is 1426 ℃. 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. opening the box after 15h of pouring, placing the blank roll collar in a red hot state into a high-temperature resistance furnace for heat preservation within 25min, wherein the heat preservation temperature is 800 ℃, the heat preservation time is 40h, cooling is carried out at the speed of 8 ℃/h after heat preservation is finished, and the furnace can be unloaded when the roll temperature reaches the room temperature. And (4) roughly processing the blank roll collar, wherein the allowance of the roll collar in the excircle diameter direction is 16mm, the allowance of the roll collar in the inner hole diameter direction is 26mm, and the allowance of the roll collar in the height direction is 13 mm. And (3) carrying out 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 1050 ℃, keeping the temperature for 13h, discharging from the furnace after heat preservation is finished, spraying for 45min till the surface temperature of the roll collar is 510 ℃, air cooling till 456 ℃, charging into the furnace and tempering. Tempering temperature is 520 ℃, heat preservation time is 50h, and continuous tempering is carried out for 3 times.
Example 3
The method comprises the following steps of smelting molten steel by using an electromagnetic induction furnace, discharging the molten steel when the temperature of the molten steel reaches 1650 ℃, carrying out centrifugal casting when the temperature of the molten steel reaches 1430 ℃, carrying out secondary casting when the temperature of a cavity reaches 1120 ℃, carrying out tertiary casting when the temperature of the cavity reaches 1123 ℃, carrying out tapping when the casting of the molten steel of the primary casting of the secondary and tertiary castings is finished, wherein the tapping temperature is 1672 ℃, and the casting temperature is 1422 ℃. 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. opening the box after the pouring is finished for 13h, placing the blank roll collar in a red hot state into a high-temperature resistance furnace for heat preservation within 28min, wherein the heat preservation temperature is 820 ℃, the heat preservation time is 38h, cooling is carried out at the speed of 7 ℃/h after the heat preservation is finished, and the furnace can be unloaded when the roll temperature reaches the room temperature. And (4) roughly processing the blank roll collar, wherein the allowance of the roll collar in the excircle diameter direction is 15mm, the allowance of the roll collar in the inner hole diameter direction is 25mm, and the allowance of the roll collar in the height direction is 13 mm. And (3) carrying out 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 1050 ℃, keeping the temperature for 13h, discharging from the furnace after heat preservation is finished, spraying for 43min till the surface temperature of the roll collar is 500 ℃, air cooling to 453 ℃, charging into the furnace and tempering. Tempering temperature is 530 ℃, the heat preservation time is 45h, and continuous tempering is carried out for 2 times.
Example 4
The method comprises the following steps of smelting molten steel by using an electromagnetic induction furnace, discharging when the temperature of the molten steel reaches 1630 ℃, carrying out centrifugal casting when the temperature of the molten steel reaches 1430 ℃, carrying out secondary casting when the temperature of a cavity reaches 1130 ℃, carrying out tertiary casting when the temperature of the cavity reaches 1122 ℃, carrying out tapping when the casting of the molten steel of the primary casting of the secondary and tertiary castings is finished, wherein the tapping temperature is 1671 ℃, and the casting temperature is 1421 ℃. 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. opening the box after 12h of pouring, placing the blank roll collar in a red hot state into a high-temperature resistance furnace for heat preservation within 27min, wherein the heat preservation temperature is 830 ℃, the heat preservation time is 37h, cooling is carried out at the speed of 8 ℃/h after heat preservation is finished, and the furnace can be unloaded when the roll temperature reaches the room temperature. And (4) roughly processing the blank roll collar, wherein the allowance in the excircle diameter direction of the roll collar is 13mm, the allowance in the inner hole diameter direction is 26mm, and the allowance in the height direction is 12 mm. And (3) carrying out 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 12h, discharging after heat preservation, spraying for 46min till the surface temperature of the roll collar is 520 ℃, air cooling till 456 ℃, charging and tempering. Tempering temperature is 525 ℃, heat preservation time is 50h, and continuous tempering is carried out for 2 times.
Example 5
The method comprises the following steps of smelting molten steel by using an electromagnetic induction furnace, discharging when the temperature of the molten steel reaches 1625 ℃, carrying out centrifugal casting when the temperature of the molten steel reaches 1450 ℃, carrying out secondary casting when the temperature of a cavity reaches 1125 ℃, carrying out tertiary casting when the temperature of the cavity reaches 1123 ℃, carrying out tapping when the casting of the molten steel of the primary casting of the secondary and tertiary castings is finished, wherein the tapping temperature is 1670 ℃, and the casting temperature is 1425 ℃. 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 finishing pouring for 11h, 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 820 ℃, the heat preservation time is 36h, cooling at the speed of 9 ℃/h after heat preservation is finished, and unloading the furnace when the roll temperature reaches the room temperature. And (4) roughly processing the blank roll collar, wherein the allowance of the roll collar in the excircle diameter direction is 15mm, the allowance of the roll collar in the inner hole diameter direction is 28mm, and the allowance of the roll collar in the height direction is 15 mm. And (3) carrying out 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 till the surface temperature of the roll collar is 525 ℃, air-cooling to 430 ℃, charging and tempering. Tempering temperature is 530 ℃, the heat preservation time is 40h, and continuous tempering is carried out for 3 times.
Example 6
The method comprises the following steps of smelting molten steel by using an electromagnetic induction furnace, discharging the molten steel when the temperature of the molten steel reaches 1623 ℃, carrying out centrifugal casting when the temperature of the molten steel reaches 1453 ℃, carrying out secondary casting when the temperature of a cavity reaches 1125 ℃, carrying out third casting when the temperature of the cavity reaches 1125 ℃, carrying out tapping when the casting of the molten steel of the first casting of the secondary and third castings is finished, wherein the tapping temperature is 1673 ℃, and the casting temperature is 1420 ℃. 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. opening the box after the pouring is finished for 13h, 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 810 ℃, the heat preservation time is 35h, cooling is carried out at the speed of 8 ℃/h after the heat preservation is finished, and the furnace can be unloaded when the roll temperature reaches the room temperature. And (4) roughly processing the blank roll collar, wherein the allowance of the roll collar in the excircle diameter direction is 13mm, the allowance of the roll collar in the inner hole diameter direction is 27mm, and the allowance of the roll collar in the height direction is 15 mm. And (3) carrying out 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 1050 ℃, keeping the temperature for 11 hours, discharging from the furnace after heat preservation is finished, spraying for 45min till the surface temperature of the roll collar is 520 ℃, air cooling till 435 ℃, charging into the furnace and tempering. Tempering temperature is 535 ℃, heat preservation time is 45h, and continuous tempering is carried out for 3 times.
The comparative example is as follows:
comparative example 1 is a conventional semi-steel roll collar; and (3) taking the products of the embodiments 1 to 6 and the comparative example 1, and carrying out tensile mechanical property detection on the samples, wherein the performance detection implements national standards GB/T1503-2008. The detection results are shown in table 1:
example tensile mechanical Property test results of products
By comparing the performances of the cast steel roll collar and the semi-steel roll collar, the contrast shows that the macro hardness of the cast steel roll collar is higher than 30%, the relative wear resistance of the cast steel roll collar representing the use performance can reach more than 2.5 times of that of the semi-steel roll collar, and the service life is greatly prolonged. From the test data of a laboratory, the heat cracking resistance of the cast steel roll collar is obviously improved compared with that of semi-steel, and the roll surface state is obviously optimized for the conventional semi-steel roll collar; according to the performance detection result, the performance of the cast steel roll collar is greatly improved compared with that of a semi-steel roll collar.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. A method for preparing a hot-cracking-resistant cast steel roll collar of a section steel rail beam universal mill comprises the following steps:
step A: smelting cast molten steel by using an electromagnetic induction furnace, discharging the molten steel after the temperature of the molten steel reaches a certain temperature, and centrifugally pouring the molten steel in a cavity to finish pouring;
and B: opening the box after a period of time after the pouring is finished, taking out the blank roll collar, and quickly putting the blank roll collar into a high-temperature resistance furnace for heat preservation;
and C: cooling at a certain speed after heat preservation is finished, and unloading the furnace after the temperature reaches the room temperature;
step D: carrying out rough machining on the blank roll collar to obtain a rough machined roll collar, wherein the allowance of the roll collar in the diameter direction of the excircle is 10-20 mm, the allowance of the roll collar in the diameter direction of the inner hole is 20-30 mm, and the allowance of the roll collar in the height direction is 10-20 mm;
step E: and plugging the inner hole of the rough-machined roll collar by using ceramic fibers, and then carrying out heat treatment.
2. The method for preparing the hot-cracking-resistant cast steel roll collar of the section steel rail beam universal mill as claimed in claim 1, wherein the method comprises the following steps: and C, discharging the outer layer cast steel in the step A when the temperature of the outer layer cast steel reaches 1600-1650 ℃, and carrying out centrifugal casting at 1400-1450 ℃.
3. The method for preparing the hot-cracking-resistant cast steel roll collar of the section steel rail beam universal mill as claimed in claim 1, wherein the method comprises the following steps: and in the step A, centrifugal casting is divided into three layers and is performed layer by layer, and the molten steel components of the outer layer, the middle layer and the core part are consistent.
4. The method for preparing the hot-cracking-resistant cast steel roll collar of the section steel rail beam universal mill as claimed in claim 1, wherein the method comprises the following steps: the steel roll collar in the step A can be formed in a one-out mode or a mode that one steel roll collar is poured and cut into a plurality of steel roll collars when one steel roll collar is poured out.
5. The method for preparing the hot-cracking-resistant cast steel roll collar of the section steel rail beam universal mill as claimed in claim 1, wherein the method comprises the following steps: and C, opening the box after the pouring in the step B is finished for 10-15 hours, and putting the blank roll collar in a red hot state into a high-temperature resistance furnace for heat preservation within 30 min.
6. The method for preparing the hot-cracking-resistant cast steel roll collar of the section steel rail beam universal mill as claimed in claim 1, wherein the method comprises the following steps: in the step B, the heat preservation temperature is 650-850 ℃, and the heat preservation time is 30-50 h; or after the pouring is finished for 100-150h, the box is opened in a cold mode, and the box is placed into a high-temperature furnace to be heated to 650-850 ℃ at the heating rate of 10-30 ℃/h for heat preservation.
7. The method for preparing the hot-cracking-resistant cast steel roll collar of the section steel rail beam universal mill as claimed in claim 1, wherein the method comprises the following steps: and C, cooling slowly at the speed of 5-15 ℃/h.
8. The method for preparing the hot-cracking-resistant cast steel roll collar of the section steel rail beam universal mill as claimed in claim 1, wherein the method comprises the following steps: the heat treatment step in the step E is as follows: heating at 1000-1100 ℃, keeping the temperature for 5-15 h, discharging after keeping the temperature, spraying for 30-60 min until the surface temperature of the roll collar is 500-530 ℃, air cooling to 400-500 ℃, and then loading into a furnace for tempering.
9. The method for preparing the hot-cracking-resistant cast steel roll collar of the section steel rail beam universal mill as claimed in claim 1, wherein the method comprises the following steps: and E, tempering at 500-580 ℃, keeping the temperature for 30-60h, and continuously tempering for 2-3 times.
10. The utility model provides a section rail roof beam universal mill hot crack resistant cast steel collar which characterized in that: the steel roll collar is of an integral structure and is centrifugally poured in three layers, the material is cast steel, and the chemical composition range is as follows: c: 1.50-2.10, Si: 0.30 to 1.00, Mn: 0.50-1.20, P is less than or equal to 0.05, S is less than or equal to 0.05, Cr: 5.00-8.00, Ni: 0.50 to 1.80, Mo: 1.00-8.00, V: less than or equal to 5.00 percent, and less than or equal to 0.50 percent of other impurity elements of Cu, Mg and Ti.
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