CN114574779A - High-alloy slitting roller and preparation method thereof - Google Patents

High-alloy slitting roller and preparation method thereof Download PDF

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CN114574779A
CN114574779A CN202210248634.3A CN202210248634A CN114574779A CN 114574779 A CN114574779 A CN 114574779A CN 202210248634 A CN202210248634 A CN 202210248634A CN 114574779 A CN114574779 A CN 114574779A
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outer layer
roller
temperature
molten steel
alloy
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王盼合
剧冬青
赵利辉
王丽丽
郑海明
赵海员
宋小朋
张国芳
鞠庆红
王小龙
陈旭
王永刚
刘长辉
赵艳涛
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Hebei Jinxi Iron And Steel Group Heavy Industry Technology Co ltd
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Hebei Jinxi Iron And Steel Group Heavy Industry Technology Co ltd
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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
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • 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
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
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    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • 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
    • 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
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • 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
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
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Abstract

The invention relates to the technical field of alloy casting, and particularly discloses a high-alloy slitting roller and a preparation method thereof. The high alloy slitting roller comprises an outer layer, a transition layer and a core. The preparation method of the high-alloy slitting roller comprises the following steps of a, smelting; b. pouring; c. annealing; d. quenching and tempering. The high-alloy segmentation roller provided by the invention has good wear resistance and impact resistance, and the steel passing amount is increased by 4-5 times compared with that of the traditional bainite roller; and the specific alloy composition in the high-alloy segmentation roller is combined with an inner-layer and outer-layer pouring process and a heat treatment process, so that the metallurgical fusion of the inner layer and the outer layer of the roller is realized, the cracking condition generated in the working process of the roller is avoided, and the segmentation steel passing amount and the roller changing period matched with a finished-product frame high-speed steel roller are ensured.

Description

High-alloy slitting roller and preparation method thereof
Technical Field
The invention relates to the technical field of alloy casting, in particular to a high-alloy slitting roller and a preparation method thereof.
Background
At present, the finished rolled wire rod products in a steel mill mainly use traditional high-speed steel component rolls, but the rolls made of the materials have high hardness and poor toughness, are frequently subjected to groove collapse and block falling when being used for a splitting frame, seriously affect normal production and cannot be used for the splitting frame. Therefore, at present, most of the segmenting frames still use bainite rolls with low steel content, but the bainite rolls have poor wear resistance, low steel content and short service cycle, cannot form matched production with finished high-speed steel rolls, and seriously affect the production efficiency.
Based on the above situation, a novel roller which has high steel cutting excess, good wear resistance and long service cycle and can be produced in a matched manner with a finished product frame is urgently needed to be developed.
Disclosure of Invention
Aiming at the problems of the existing high-alloy segmentation roller, the invention provides the high-alloy segmentation roller and the preparation method thereof, the high-alloy segmentation roller has good wear resistance and good shock resistance, and the steel passing amount is increased by 4-5 times compared with the traditional bainite roller; and the specific alloy composition in the high-alloy segmentation roller is combined with an inner-layer and outer-layer pouring process and a roller heat treatment process, so that the metallurgical fusion of the inner layer and the outer layer is realized, the cracking condition generated in the working process of the roller is avoided, and the segmentation steel passing amount and the roller changing period matched with a high-speed steel finished roller are ensured.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
a high alloy slitting roller comprises an outer layer, a transition layer and a core part;
the alloy elements of the outer layer comprise the following components in percentage by weight: c: 1.0% -1.2%, Si: 0.5% -1.5%, Mn: 0.5-1.5%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, Cr: 12.0% -15.0%, Mo: 1.0% -4.0%, Ni: 0.1% -1.5%, Nb: 0.1% -1.5%, V: 0.5% -3.0%, W: 0.5% -4.0%, Co: 0.5% -1.5%, Cu: 0.1% -1.0%, Ce: 0.01% -0.1%, La: 0.001% -0.01%, N: 0.05% -0.15%: al: 0.05% -0.15%, and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the transition layer are as follows: c: 1.0% -2.0%, Si: 1.2% -2.0%, Mn: 0.5 to 0.8 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 Cr, and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the core part are as follows: c: 2.9% -3.6%, Si: 2.0% -2.5%, Mn: 0.5 to 0.8 percent of the total weight of the alloy, less than or equal to 0.1 percent of P, less than or equal to 0.03 percent of S, less than or equal to 0.25 percent of Cr, more than or equal to 0.04 percent of Mg, and the balance of Fe and inevitable impurities.
Compared with the prior art, the high-alloy slitting roller provided by the invention has the advantages that the composition of the alloy elements in the outer working layer is designed, the Cr/C ratio is ensured to be more than 10, and the obtained outer molten steel can form Cr in the solidification process7C3Form carbide and make Cr7C3The type carbide is arranged in a chrysanthemum-like radial shape, so that the hardness of the outer layer is ensured, and the toughness of the outer layer is effectively improved. Meanwhile, the high Cr content is matched with the addition of specific amounts of molybdenum, vanadium, tungsten and niobium, so that various types of carbides are formed in the molten steel solidification process, and the hardenability, the heat resistance and the red hardness of the outer layer of the roller are effectively improved. The addition of the Co alloy ensures the high-temperature hardness of the outer layer of the roller in the working state of 600-700 ℃ in the alloy system, so that the hardness of the cutting tool part of the roller which is not easily cooled by cooling water is ensured. The wear resistance of the obtained outer working layer is greatly improved by the matching of the outer alloy elements.
Meanwhile, the roller is beneficial to high-temperature metallurgical bonding with the outer layer and better fusion with the core part by designing the alloy components of the transition layer and the core part, ensures the bonding strength of the inner layer and the outer layer of the roller obtained by centrifugal casting, avoids cracking and avoids the permeation of the alloy of the outer layer into the inner layer.
The segmentation roller produced by the composition design and the pouring process is treated by a specific heat treatment process to obtain a tempered martensite matrix plus primary and secondary carbide structures, so that the steel passing amount and the service life of the segmentation roller are obviously improved.
The invention also provides a preparation method of the high alloy slitting roller, which comprises the following steps:
a. respectively weighing the raw materials of the outer layer, the transition layer and the core part according to the composition of alloy elements, and respectively smelting to obtain outer layer molten steel, transition layer molten steel and core part molten iron; in the outer layer molten steel process, adding a rare earth alterant and a deoxidizer to modify and deoxidize the outer layer molten steel, and adding chromium nitride before the outer layer molten steel is discharged; the addition of the chromium nitride meets the requirements that the mass content of Cr in the outer layer molten steel is 12.0-15.0%, and the mass content of N is 0.05-0.15%;
b. centrifugally casting the outer layer molten steel in a cold mold, centrifugally casting the transition layer molten steel, and finally casting the core molten iron under the condition of stopping centrifugation, and cooling and solidifying to obtain a roller blank;
c. heating the roller blank to 840-880 ℃, annealing (aiming at homogenizing the outer layer structure and improving the comprehensive performance of the quenched structure), and cooling to obtain an annealed roller blank;
d. sequentially quenching and tempering the annealed roller blank to obtain the high-alloy segmentation roller; the quenching treatment temperature is 1000-1050 ℃; the tempering treatment relates to three times of heating and cooling processes, wherein the end point temperature of the first heating is 525-535 ℃, the end point temperature of the second heating is 505-515 ℃, and the end point temperature of the third heating is 495-505 ℃.
Compared with the prior art, in the preparation method of the high-alloy segmentation roller provided by the invention, the specific amount of chromium nitride is added before the molten steel on the outer layer is discharged from the furnace, and in the process of solidifying the molten steel, nitrogen in the molten steel interacts with other alloys to form a strong Fe-N alloy martensite segregation structural unit, so that the weight of the segregation structural unit with strong resultant force in the structure is increased, and the segmentation roller has strong strength and toughness. Meanwhile, a certain proportion of alterant and deoxidizer is added before the outer layer molten steel is taken out of the furnace, composite inclusions with high melting point can be formed, and in the process of molten steel solidification, the inclusions can be used as the core of non-spontaneous crystallization, so that the grains are refined, the grains are prevented from growing, and the impact toughness of the high-alloy segmentation roller is obviously improved.
According to the preparation method of the high-alloy segmentation roller, a centrifugal composite casting process is adopted, the roller is cast and molded by three times, and the special alloy element composition, the smelting process, the annealing process, the quenching process and the three-time tempering process of each layer are combined, so that the obtained high-alloy segmentation roller has good wear resistance and impact toughness, and the service life, the steel passing amount and the accident resistance of the segmentation roller are obviously improved.
Preferably, in step a, the smelting temperature of the raw material of the outer layer is 1550 ℃ to 1600 ℃.
Preferably, in step a, the smelting temperature of the raw material of the transition layer is 1550-1600 ℃.
Preferably, in step a, the smelting temperature of the raw materials of the core part is 1460-1500 ℃.
Preferably, in step a, the rare earth alterant includes metals La and Ce.
Preferably, in step a, the deoxidizer is an aluminum ingot. Wherein the adding amount of the aluminum ingot meets the requirement that the mass content of the total Al of the outer layer is 0.05-0.15%.
The addition of the rare earth metals La and Ce and the deoxidizer aluminum ingot in specific amounts can further improve the grain fineness of the alloy of the outer working layer, reduce the overheating sensitivity, improve the form, particle size and distribution of carbides, and improve the impact toughness of the roller.
Preferably, in the step b, the pouring temperature of the outer layer molten steel is 1500-1520 ℃, and the centrifugal rotation speed is 850-; after the outer layer molten steel is poured, adding 3-6kg of glass protective slag into the cold mold, wherein the amount of the added glass protective slag is 3-6kg per square meter of the inner surface of the outer layer, and the glass protective slag consists of O-shaped slag and anhydrous borax in a mass ratio of 1: 0.8-1.2; the casting thickness of the outer layer is 50mm-80 mm.
The addition of the glass protective slag can avoid the oxidation of the outer layer alloy.
Preferably, in the step b, after the outer layer molten steel is poured, the outer layer molten steel is constantly centrifuged for 3-10min under the condition that the centrifugal rotating speed is not changed, and then the transition layer is poured under the condition that the centrifugal rotating speed is not changed, wherein the pouring temperature of the transition layer molten steel is 1500-; the casting thickness of the transition layer is 15-30 mm.
Preferably, in the step b, after the pouring of the molten steel of the transition layer is finished, the molten steel of the core part is poured by constant centrifugation for 5-10min under the condition that the centrifugal rotation speed is not changed, and the centrifugation is stopped, wherein the pouring temperature of the molten steel of the core part is 1400-1420 ℃.
Preferably, in step b, the cooling mode is furnace cooling.
Preferably, in the step c, the heating rate is 10 ℃/h-15 ℃/h, the roller blank is kept at the temperature of 640-660 ℃ for 4-6h in the heating process, and then is continuously heated to 840-880 ℃ at the rate of 20 ℃/h-30 ℃/h for 8-12 h.
Preferably, in the step c, the cooling mode is furnace cooling until the temperature is cooled to be below 100 ℃, and the material is taken out of the kiln.
Preferably, in the step d, the temperature rise rate of the quenching treatment is 5 ℃/h-10 ℃/h; in the heating process of the quenching treatment, when the temperature reaches 230-250 ℃, the heat is preserved for 1.5-2.5h, then when the temperature is continuously raised to 640-660 ℃, the heat is preserved for 3-5 h, then the temperature is continuously raised to 1050 ℃ for heat preservation for 5-7 h, finally the temperature is cooled to below 450 ℃, and then the tempering treatment is carried out.
Preferably, in the step d, the cooling method in the quenching process is as follows: spraying, adding air, cooling to 540-560 ℃, and then air cooling to below 450 ℃.
In the heat treatment quenching process, the roller blank is rapidly cooled to 540-560 ℃ by adopting spray and air-adding, wherein high-temperature austenite is not ready for conversion, the austenite contains high-concentration carbon and other alloys, and dispersed carbide can be precipitated for the second time in the subsequent specific tempering process, so that the hardness and the wear resistance of the roller are further improved.
Preferably, in the step d, the three temperature rise rates of the tempering treatment are all 10 ℃/h-15 ℃/h, the temperature is kept for 15h-20h after the temperature is raised to the end point temperature every time, and then the tempering treatment is carried out along with the furnace for cooling, wherein the end point temperature of each cooling is below 100 ℃.
Drawings
FIG. 1 is a metallographic picture of a high alloy slitting roll according to example 1 of the present invention.
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 do not limit the invention.
Example 1
A high alloy slitting roller (phi 380 x 650 slitting roller) comprises an outer layer, a transition layer and a core part;
the alloy elements of the outer layer comprise the following components in percentage by weight: c: 1.0%, Si: 0.5%, Mn: 0.5%, P: 0.03%, S: 0.02%, Cr: 12.0%, Mo: 4.0%, Ni: 0.1%, Nb: 0.1%, V: 3.0%, W: 4.0%, Co: 0.5%, Cu: 0.1%, Ce: 0.01%, La: 0.001%, N: 0.05%: al: 0.05%, and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the transition layer are as follows: c: 1.0%, Si: 1.2%, Mn: 0.5%, P: 0.021%, S: 0.025%, Cr: 0.15%, and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the core part are as follows: c: 2.9%, Si: 2.0%, Mn: 0.5%, P: 0.1%, S: 0.01%, Cr: 0.20%, Mg: 0.04%, and the balance of Fe and inevitable impurities.
The preparation method of the high-alloy slitting roller comprises the following steps:
a. centrifugal cold mold, bottom cap molding and end cover preparation: after the cold-type and well-made bottom cap box and the end cover are put into a kiln, heating to 250 ℃ at the speed of 20 ℃/h, and preserving heat for 4 hours; then spraying 2mm quartz powder coating on the inner wall of the cold mould, cleaning the coatings at two ends, installing an end cover, sealing the gap of the end cover by using the coating, and tightening the end cover by using a pin;
respectively weighing raw materials of the outer layer, the transition layer and the core part according to the composition of alloy elements, and respectively smelting to obtain outer layer molten steel, transition layer molten steel and core part molten iron; the smelting temperature of the raw material of the outer layer is 1550 ℃, in the process of discharging the molten steel of the outer layer, a rare earth modifier and an aluminum ingot are added (the addition of Ce, La and the aluminum ingot in the rare earth modifier meets the requirement that the mass content of Ce and La in the whole molten steel of the outer layer is 0.01 percent and 0.001 percent respectively, and the mass content of Al is 0.05 percent), the molten steel of the outer layer is modified and deoxidized, and then chromium nitride is added 10min before the molten steel of the outer layer is discharged from the furnace (wherein the addition of the chromium nitride meets the requirement that the mass content of Cr in the whole molten steel of the outer layer is 12.0 percent, and the mass content of N is 0.05 percent); the smelting temperature of the raw material of the transition layer is 1550 ℃; the melting temperature of the raw material of the core is 1460 ℃.
b. Centrifugally casting outer-layer molten steel in a cold mold, wherein the casting temperature of the outer-layer molten steel is 1500 ℃, the centrifugal speed is 850r/min, and the casting thickness of the outer layer is 50 mm; after the outer layer molten steel is poured, adding glass protective slag (the glass protective slag consists of O-shaped slag and anhydrous borax in a mass ratio of 1: 0.8) into the cold mold, wherein the amount of the added glass protective slag is 3kg per square meter of the inner surface of the outer layer; after constant centrifugation for 3min under the condition of constant centrifugal rotation speed, pouring a transition layer under the condition of constant centrifugal rotation speed, wherein the pouring temperature of molten steel of the transition layer is 1500 ℃, and the pouring thickness of the transition layer is 15 mm; after the molten steel of the transition layer is poured, constantly centrifuging for 5min under the condition that the centrifugal rotating speed is not changed, stopping centrifuging, lifting the cold mold and the bottom cap box to close the box, and immediately pouring the molten iron of the core part, wherein the pouring temperature of the molten iron of the core part is 1400 ℃; cooling along with the furnace after the pouring is finished to obtain a roller blank;
c. heating the roll blank to 640 ℃ at the speed of 10 ℃/h, then preserving heat for 4h, then continuously heating to 840 ℃ at the speed of 20 ℃/h, preserving heat for 8h, finishing annealing, cooling to below 100 ℃ along with the furnace, and discharging the roll blank out of the furnace to obtain an annealed roll blank;
d. carrying out rough machining on the annealed roller blank, and then sequentially carrying out quenching treatment, wherein the heating rate of the quenching treatment is 5 ℃/h; in the heating process of quenching treatment, when the temperature of the roller blank reaches 230 ℃, preserving heat for 1.5h, then continuing to heat to 640 ℃, preserving heat for 3h, then continuing to heat to 1000 ℃, preserving heat for 5h, then spraying, adding air, cooling to 540 ℃, then air cooling to 450 ℃, and then tempering treatment; the tempering treatment relates to three heating and cooling processes, wherein the three heating rates are 10 ℃/h, the end point temperature of the first heating is 525 ℃, the furnace cooling is carried out to 100 ℃ after the heat preservation is carried out for 15h, the end point temperature of the second heating is 505 ℃, the furnace cooling is carried out to 100 ℃ after the heat preservation is carried out for 15h, the end point temperature of the third heating is 495 ℃, the furnace cooling is carried out to 100 ℃ after the heat preservation is carried out for 15h, and the high alloy segmentation roller is obtained. And detecting the metallographic structure of the obtained high-alloy slitting roller to obtain a metallographic structure, wherein the obtained metallographic structure is shown in a figure 1. In the metallographic structure, a black matrix is tempered martensite, point-like carbides in the martensite are secondary carbides dispersed and precipitated in the tempering and cooling process, the hardness and the wear resistance of the martensite are further improved, and meanwhile, most of the carbides are dissolved in the matrix in a solid manner, so that a key effect is achieved on improving the toughness of the structure; the carbide at the crystal boundary part is primary eutectic undissolved carbide, can improve the integral wear resistance of an outer layer structure, and can play a role in inhibiting the growth of crystal grains in the heat preservation process of quenching heat treatment.
Example 2
A high alloy slitting roller (phi 390 x 650 slitting roller) comprises an outer layer, a transition layer and a core part;
the alloy elements of the outer layer comprise the following components in percentage by weight: c: 1.1%, Si: 0.9%, Mn: 0.7%, P: 0.012%, S: 0.014%, Cr: 13.7%, Mo: 2.5%, Ni: 0.7%, Nb: 1.1%, V: 1.9%, W: 2.3%, Co: 1.2%, Cu: 0.6%, Ce: 0.05%, La: 0.006%, N: 0.09%: al: 0.11%, and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the transition layer are as follows: c: 1.5%, Si: 1.8%, Mn: 0.6%, P: 0.03%, S: 0.022%, Cr: 0.12%, and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the core part are as follows: c: 3.3%, Si: 2.2%, Mn: 0.7%, P: 0.06%, S: 0.03%, Cr: 0.25%, Mg: 0.05%, and the balance of Fe and inevitable impurities.
The preparation method of the high-alloy slitting roller comprises the following steps:
a. centrifugal cold mold, bottom cap molding and end cover preparation: after the cold-type and well-made bottom cap box and the end cover are put into the kiln, heating to 300 ℃ at the speed of 25 ℃/h, and preserving heat for 6 hours; then spraying 3mm quartz powder coating on the inner wall of the cold mould, cleaning the coatings at two ends, then installing an end cover, sealing a gap between the end covers by using the coating, and simultaneously fastening the end covers by using pins;
respectively weighing raw materials of the outer layer, the transition layer and the core part according to the composition of alloy elements, and respectively smelting to obtain outer layer molten steel, transition layer molten steel and core part molten iron; the smelting temperature of the raw material of the outer layer is 1580 ℃, a rare earth modifier and an aluminum ingot are added in the process of discharging the molten steel of the outer layer (the addition of Ce, La and the aluminum ingot in the rare earth modifier meets the requirement that the mass content of Ce and La in the whole molten steel of the outer layer is 0.05 percent and 0.006 percent respectively, and the mass content of Al is 0.11 percent), the molten steel of the outer layer is modified and deoxidized, and then chromium nitride is added 12min before the molten steel of the outer layer is discharged from the furnace (wherein the addition of the chromium nitride meets the requirement that the mass content of Cr in the whole molten steel of the outer layer is 13.7 percent and the mass content of N is 0.09 percent); the smelting temperature of the raw materials of the transition layer is 1560 ℃; the melting temperature of the raw material of the core part was 1480 ℃.
b. The outer layer molten steel is centrifugally poured in the cold mold, the pouring temperature of the outer layer molten steel is 1510 ℃, the centrifugal rotating speed is 900r/min, and the pouring thickness of the outer layer is 60 mm; after the outer layer molten steel is poured, adding glass protective slag (the glass protective slag consists of O-shaped slag and anhydrous borax in a mass ratio of 1: 1) into the cold mold, wherein the amount of the added glass protective slag is 5kg per square meter of the inner surface of the outer layer; after constant centrifugation for 5min under the condition of constant centrifugal rotation speed, pouring a transition layer under the condition of constant centrifugal rotation speed, wherein the pouring temperature of molten steel of the transition layer is 1510 ℃, and the pouring thickness of the transition layer is 15 mm; and after the molten steel of the transition layer is poured, constantly centrifuging for 6min under the condition that the centrifugal rotating speed is not changed, stopping centrifuging, lifting the cold mold and the bottom cap box to close the box, and immediately pouring the molten iron of the core part, wherein the pouring temperature of the molten iron of the core part is 1420 ℃, and cooling along with the furnace after pouring is finished to obtain a roll blank.
c. Heating the roller blank to 650 ℃ at the speed of 12 ℃/h, then preserving heat for 5h, then continuously heating to 860 ℃ at the speed of 25 ℃/h, preserving heat for 10h, finishing annealing, cooling to below 100 ℃ along with the furnace, and discharging to obtain an annealed roller blank;
d. carrying out rough machining on the annealed roller blank and then sequentially carrying out quenching treatment, wherein in the heating process of the quenching treatment, the roller blank is heated to 230-250 ℃ at the heating rate of 8 ℃/h, is kept at the temperature for 2h, is continuously heated to 650 ℃ at the heating rate of 15 ℃/h, is kept at the temperature for 4h, is continuously heated to 1030 ℃ at the heating rate of 15 ℃/h, is kept at the temperature for 6h, is sprayed, air-cooled to 550 ℃, is air-cooled to 440 ℃, and is subjected to tempering treatment; the tempering treatment relates to three heating and cooling processes, wherein the three heating rates are 12 ℃/h, the end point temperature of the first heating is 530 ℃, the furnace cooling is carried out to 90 ℃ after the heat preservation is carried out for 20h, the end point temperature of the second heating is 510 ℃, the furnace cooling is carried out to 95 ℃ after the heat preservation is carried out for 20h, the end point temperature of the third heating is 500 ℃, the furnace cooling is carried out to 80 ℃ after the heat preservation is carried out for 15h, and the high-alloy segmentation roller is obtained. The metallographic structure of the obtained high-alloy slit roll was examined and was similar to that in example 1.
Example 3
A high alloy slitting roller (phi 360 x 600 slitting roller) comprises an outer layer, a transition layer and a core part;
the alloy elements of the outer layer comprise the following components in percentage by weight: c: 1.2%, Si: 1.5%, Mn: 1.5%, P: 0.012%, S: 0.011%, Cr: 15.0%, Mo: 1.0%, Ni: 1.5%, Nb: 1.5%, V: 0.5%, W: 0.5%, Co: 1.5%, Cu: 1.0%, Ce: 0.1%, La: 0.01%, N: 0.15%: al: 0.15%, and the balance of Fe and unavoidable impurities;
the alloy element composition and the weight percentage of the transition layer are as follows: c: 2.0%, Si: 2.0%, Mn: 0.8%, P: 0.025%, S: 0.021%, Cr: 0.14%, and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the core part are as follows: c: 3.6%, Si: 2.5%, Mn: 0.8%, P: 0.05%, S: 0.02%, Cr: 0.21%, Mg: 0.07%, and the balance of Fe and inevitable impurities.
The preparation method of the high-alloy slitting roller comprises the following steps:
a. centrifugal cold mold, bottom cap molding and end cover preparation: after the cold-type and well-made bottom cap box and the end cover are put into a kiln, heating to 350 ℃ at the speed of 30 ℃/h, and preserving heat for 8 hours; then spraying 4mm quartz powder coating on the inner wall of the cold mould, cleaning the coatings at two ends, installing an end cover, sealing the gap of the end cover by using the coating, and tightening the end cover by using a pin;
respectively weighing raw materials of the outer layer, the transition layer and the core part according to the composition of alloy elements, and respectively smelting to obtain outer layer molten steel, transition layer molten steel and core part molten iron; the smelting temperature of the raw material of the outer layer is 1600 ℃, in the process of discharging the molten steel of the outer layer, a rare earth modifier and an aluminum ingot are added (wherein the addition of Ce, La and the aluminum ingot in the rare earth modifier meets the requirement that the mass content of Ce and La in the whole molten steel of the outer layer is 0.1 percent and 0.01 percent respectively, and the mass content of Al is 0.15 percent), the molten steel of the outer layer is modified and deoxidized, and then chromium nitride is added 15min before the molten steel of the outer layer is discharged from the furnace (wherein the addition of the chromium nitride meets the requirement that the mass content of Cr in the whole molten steel of the outer layer is 15.0 percent and the mass content of N is 0.15 percent); the smelting temperature of the raw material of the transition layer is 1600 ℃; the melting temperature of the raw material of the core part was 1500 ℃.
b. Centrifugally casting the outer layer molten steel in a cold mold, wherein the casting temperature of the outer layer molten steel is 1520 ℃, the centrifugal rotating speed is 1000r/min, and the casting thickness of the outer layer is 80 mm; after the outer layer molten steel is poured, adding glass protective slag (the glass protective slag consists of O-shaped slag and anhydrous borax in a mass ratio of 1: 1.2) into the cold mold, wherein the amount of the added glass protective slag is 6kg per square meter of the inner surface of the outer layer; after the constant centrifugation is carried out for 10min under the condition that the centrifugal rotating speed is not changed, a transition layer is poured under the condition that the centrifugal rotating speed is not changed, the pouring temperature of molten steel of the transition layer is 1520 ℃, and the pouring thickness of the transition layer is 30 mm; and after the molten steel of the transition layer is poured, constantly centrifuging for 10min under the condition that the centrifugal rotating speed is not changed, stopping centrifuging, lifting the cold mold and the bottom cap box to close the box, and immediately pouring the molten iron of the core part at the pouring temperature of 1420 ℃, and cooling along with the furnace after the pouring is finished to obtain the roller blank.
c. Heating the roll blank to 660 ℃ at the speed of 15 ℃/h, then preserving heat for 6h, then continuously heating to 880 ℃ at the speed of 30 ℃/h, preserving heat for 12h, finishing annealing, cooling to below 100 ℃ along with the furnace, and discharging to obtain an annealed roll blank;
d. carrying out rough machining on the annealed roller blank, then sequentially carrying out quenching treatment, wherein in the heating process of the quenching treatment, the roller blank is heated to 250 ℃ at the speed of 10 ℃/h, is subjected to heat preservation for 2.5h, is then continuously heated to 660 ℃ at the speed of 15 ℃/h, is subjected to heat preservation for 5h, is then continuously heated to 1050 ℃ at the speed of 15 ℃/h, is subjected to heat preservation for 7h, is sprayed, air-cooled to 560 ℃, is then air-cooled to 400 ℃, and is then subjected to tempering treatment; the tempering treatment relates to three heating and cooling processes, wherein the three heating rates are all 15 ℃/h, the end point temperature of the first heating is 535 ℃, the furnace cooling is carried out to 80 ℃ after the heat preservation is carried out for 20h, the end point temperature of the second heating is 515 ℃, the furnace cooling is carried out to 80 ℃ after the heat preservation is carried out for 20h, the end point temperature of the third heating is 505 ℃, the furnace cooling is carried out to 70 ℃ after the heat preservation is carried out for 20h, and the high-alloy splitting roller is obtained. The metallographic structure of the obtained high-alloy slitting roller was examined and was similar to that in example 1.
Test example 1
A30X 30mm test piece was cut out from each of the outer layers of the rolls prepared in examples 1 to 3, and a wear resistance test was conducted on an MMW-2A metal multifunctional frictional wear tester, and the results showed that the roll sample pieces of examples 1 to 3 had wear amounts of 0.36g/h, 0.33g/h and 0.34g/h, respectively. It is shown that the rolls prepared in examples 1 to 3 had extremely low wear and good wear resistance.
Impact resistance test pieces of 10X 50mm were cut out from the outer layers of the rolls prepared in examples 1 to 3, respectively, and the results of the impact resistance test were examined to show A of the rolls obtained in examples 1 to 3kThe value can reach 17J/cm respectively2、18J/cm2And 18J/cm2And has excellent shock resistance.
After the roller obtained in the embodiment 1-3 is used by three steel companies of Jiangxi Jiujiang Nu steel, Shandong sunshine steel and Shandong stone transverse special steel, when the phi 12mm deformed steel bar is rolled by a cutting frame, the steel passing amount reaches over 1200 tons and is as high as 1500 tons at most, and accidents such as cracking, groove collapse and the like do not occur in the whole cutting process.
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. A high alloy segmentation roll which is characterized in that: comprises an outer layer, a transition layer and a core part;
the alloy elements of the outer layer comprise the following components in percentage by weight: c: 1.0% -1.2%, Si: 0.5% -1.5%, Mn: 0.5-1.5%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, Cr: 12.0% -15.0%, Mo: 1.0% -4.0%, Ni: 0.1% -1.5%, Nb: 0.1% -1.5%, V: 0.5% -3.0%, W: 0.5% -4.0%, Co: 0.5% -1.5%, Cu: 0.1% -1.0%, Ce: 0.01% -0.1%, La: 0.001% -0.01%, N: 0.05-0.15%: al: 0.05-0.15%, and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the transition layer are as follows: c: 1.0% -2.0%, Si: 1.2-2.0%, Mn: 0.5-0.8%, 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 0.15%, and the balance of Fe and inevitable impurities;
the alloy element composition and the weight percentage of the core part are as follows: c: 2.9% -3.6%, Si: 2.0% -2.5%, Mn: 0.5 to 0.8 percent of the total weight of the alloy, less than or equal to 0.1 percent of P, less than or equal to 0.03 percent of S, less than or equal to 0.25 percent of Cr, more than or equal to 0.04 percent of Mg, and the balance of Fe and inevitable impurities.
2. The method for preparing a high alloy slitting roller as claimed in claim 1, wherein: the method comprises the following steps:
a. respectively weighing the raw materials of the outer layer, the transition layer and the core part according to the composition of alloy elements, and respectively smelting to obtain outer layer molten steel, transition layer molten steel and core part molten iron; adding a rare earth alterant and a deoxidizer in the tapping process of the outer layer molten steel, carrying out modification and deoxidation treatment on the outer layer molten steel, and adding chromium nitride before tapping of the outer layer molten steel; the addition of the chromium nitride meets the requirements that the mass content of Cr in the outer layer molten steel is 12.0-15.0%, and the mass content of N is 0.05-0.15%;
b. centrifugally casting the outer layer molten steel in the cold mold, centrifugally casting the transition layer molten steel, and finally casting the core molten iron under the condition of stopping centrifugation, and cooling and solidifying to obtain a roller blank;
c. heating the roller blank to 840-880 ℃ for annealing, and cooling to obtain an annealed roller blank;
d. sequentially quenching and tempering the annealed roller blank to obtain the high-alloy segmentation roller; the quenching treatment temperature is 1000-1050 ℃; the tempering treatment relates to three times of heating and cooling processes, wherein the end point temperature of the first heating is 525-535 ℃, the end point temperature of the second heating is 505-515 ℃, and the end point temperature of the third heating is 495-505 ℃.
3. The method for preparing a high alloy slitting roller as claimed in claim 2, wherein: in the step a, the smelting temperature of the raw material of the outer layer is 1550-1600 ℃;
and/or in the step a, the smelting temperature of the raw material of the transition layer is 1550-1600 ℃;
and/or in the step a, the smelting temperature of the raw materials of the core part is 1460-1500 ℃.
4. The method for preparing a high alloy slitting roller as claimed in claim 2, wherein: in the step a, the rare earth alterant comprises metals La and Ce;
and/or in the step a, the deoxidizer is an aluminum ingot, and the addition amount of the aluminum ingot meets the requirement that the total Al mass content of the outer layer is 0.05-0.15%.
5. The method for preparing a high alloy slitting roller as claimed in claim 2, wherein: in the step b, the pouring temperature of the outer layer molten steel is 1500-1520 ℃, and the centrifugal rotating speed is 850-1000 r/min; after the outer layer molten steel is poured, adding 3-6kg of glass protective slag into the cold mold, wherein each square meter of the inner surface of the outer layer is added; the casting thickness of the outer layer is 50mm-80 mm;
and/or in the step b, after the outer layer molten steel is poured, the outer layer molten steel is constantly centrifuged for 3min to 10min under the condition that the centrifugal rotating speed is not changed, and then the transition layer is poured under the condition that the centrifugal rotating speed is not changed, wherein the pouring temperature of the transition layer molten steel is 1500 ℃ to 1520 ℃; the casting thickness of the transition layer is 15mm-30 mm;
and/or in the step b, after the pouring of the molten steel of the transition layer is finished, constantly centrifuging for 5-10min under the condition that the centrifugal rotating speed is not changed, stopping centrifuging, and pouring the molten iron of the core part, wherein the pouring temperature of the molten iron of the core part is 1400-1420 ℃.
6. The method for preparing a high alloy slitting roller as claimed in claim 2, wherein: in the step b, the cooling mode is furnace cooling.
7. The method for preparing a high alloy slitting roller as claimed in claim 2, wherein: in the step c, the heating rate is 10 ℃/h-15 ℃/h, the roller blank is kept at the temperature of 640-660 ℃ for 4-6h in the heating process, and then is continuously heated to 840-880 ℃ at the rate of 20 ℃/h-30 ℃/h and kept at the temperature for 8-12 h;
and/or in the step c, the cooling mode is furnace cooling until the temperature is cooled to be below 100 ℃, and then the material is taken out of the kiln.
8. The method for preparing the high alloy slitting roller according to claim 2, characterized in that: in the step d, the temperature rise rate of the quenching treatment is 5 ℃/h-10 ℃/h; in the heating process of the quenching treatment, when the temperature reaches 230-250 ℃, the heat is preserved for 1.5-2.5h, then when the temperature is continuously raised to 640-660 ℃, the heat is preserved for 3-5 h, when the temperature is continuously raised to 1000-1050 ℃, the heat is preserved for 5-7 h, finally the temperature is cooled to below 450 ℃, and then the tempering treatment is carried out.
9. The method for preparing a high alloy slitting roller as claimed in claim 8, wherein: in the step d, the cooling mode in the quenching treatment process is as follows: spraying, adding air, cooling to 540-560 ℃, and then air cooling to below 450 ℃.
10. The method for preparing a high alloy slitting roller as claimed in claim 2, wherein: in the step d, the three heating rates of the tempering treatment are all 10-15 ℃/h, the temperature is kept for 15-20 h after each time of heating to the end point temperature, then the furnace cooling is carried out, and the end point temperature of each cooling is below 100 ℃.
CN202210248634.3A 2022-03-14 2022-03-14 High-alloy slitting roller and preparation method thereof Pending CN114574779A (en)

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CN115418574A (en) * 2022-10-14 2022-12-02 浙江正达模具有限公司 Special composite steel with steel core for high-hardness kitchen knife and preparation method thereof
CN115679186A (en) * 2022-11-10 2023-02-03 中钢集团邢台机械轧辊有限公司 Preparation method of tool steel roll for tropical wide-width aluminum rolling mill

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CN115679186B (en) * 2022-11-10 2024-05-14 中钢集团邢台机械轧辊有限公司 Preparation method of tool steel roller for tropical wide aluminum rolling mill

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Application publication date: 20220603