CN114367649A - Preparation method of high-speed steel working roll for hot rolling plate strip finish rolling - Google Patents

Preparation method of high-speed steel working roll for hot rolling plate strip finish rolling Download PDF

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CN114367649A
CN114367649A CN202111546512.4A CN202111546512A CN114367649A CN 114367649 A CN114367649 A CN 114367649A CN 202111546512 A CN202111546512 A CN 202111546512A CN 114367649 A CN114367649 A CN 114367649A
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speed steel
working roll
rolled
hot
plate strip
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CN114367649B (en
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刘娣
胡兵
马凤川
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Sinosteel Xingtai Machinery and Mill Roll Co Ltd
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Sinosteel Xingtai Machinery and Mill Roll Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • 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
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
    • 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
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys
    • C22C33/10—Making cast-iron alloys including procedures for adding magnesium
    • 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
    • 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
    • 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
    • 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
    • C22C38/18—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
    • 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
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention discloses a preparation method of a hot rolled plate strip finish rolling high-speed steel working roll, which belongs to the technical field of roll materials, comprises the component range, the manufacturing mode and the preparation process parameters of the working roll, and prepares a hot rolled plate strip finish rolling high-speed steel working roll with high surface quality, high accident resistance and high wear resistance, in particular a finished rack high-speed steel working roll through the research on materials and preparation processes, and is more suitable for a rolling roll for rolling a rolling line with the requirement of prolonging the finish rolling, in particular the service of the finished rack high-speed steel working roll.

Description

Preparation method of high-speed steel working roll for hot rolling plate strip finish rolling
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a preparation method of a high-speed steel working roll for finish rolling of a hot rolled plate strip.
Background
Along with the capacity improvement of the steel industry, the application demand of the all-line high-speed steel is gradually urgent, at present, high-speed steel working rolls are arranged at the front sections of a vertical roll, rough rolling and finish rolling to meet the market demand, the current mainstream material of the finish rolling rear section is still a high-nickel-chromium working roll, and the use of the conventional finish rolling high-speed steel is greatly limited due to the conditions of strip throwing and the like of the finish rolling rear section, particularly a finished product rack. Therefore, the finish rolling rear section and the finished stand high speed steel become short plates which limit the increase of the capacity of the hot rolling line.
The problem that how to determine the preparation process of the special high-speed steel developed by aiming at the characteristics of finish rolling, particularly rear-section frames, is to be solved urgently in developing special high-speed steel working rolls.
Disclosure of Invention
The invention aims to provide a preparation method of a hot-rolled plate strip finish-rolled high-speed steel working roll, which is used for meeting the requirement of a hot-rolled line finished product rack on using high-speed steel and improving the quality of the roll. Different from the conventional manufacturing mode, the method further increases the accident resistance and the roller surface retention performance on the premise of ensuring the wear resistance of the finish rolling high-speed steel working roller.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a hot-rolled plate strip finish-rolled high-speed steel working roll comprises the following steps:
step A, when the smelting molten iron meets the corresponding component requirements, the outer layer molten steel smelting temperature is 1400-;
step B, after the smelting components reach the standard, the molten iron on the outer layer and the core is electrically heated to the temperature of 1500-;
step C, opening the box after pouring for 80-100 hours, and then roughly machining the roller body, wherein the allowance in the diameter direction is 5-15mm, and the allowance in the axial direction is 5-200 mm;
d, after the rough machining is finished, quenching and heating the roller body in a high-temperature heat treatment mode and carrying out overall tempering treatment;
and E, finishing and detecting after quenching and tempering until a finished product is obtained.
The technical scheme of the invention is further improved as follows: the composition range of the outer layer alloy in the step A and the step B is as follows: 1.0-4.0% of C, 0.8-8.0% of Si, 0.2-1.2% of Mn, less than or equal to 0.10% of P, less than or equal to 0.1% of S, 1.0-8.0% of Cr1, 2.0-10.0% of Ni0, 0.5-10.0% of Mo0.1-8.0% of V, W: 0.1 to 6.0 percent of Nb, less than or equal to 1.0 percent of Nb, and the balance of Fe; the chemical composition range of the core is C2.3-4.0%, Si 1.0-4.0%, Mn 0.1-1.0%, P is less than or equal to 0.10%, S is less than or equal to 0.1%, Cr is less than or equal to 1.0%, Ni is less than or equal to 2.0%, Mo0.1-3.0%, W + V + Nb is less than or equal to 0.8%, and the balance is iron.
The technical scheme of the invention is further improved as follows: w, V, Nb are selected to be three, two, any one or none of them.
The technical scheme of the invention is further improved as follows: the raw materials smelted in the step A are selected from waste direct smelting, compound of multi-component alloy or raw materials of ferrovanadium, Mo iron and the like.
The technical scheme of the invention is further improved as follows: the inoculant in the step B is one or more of ferrosilicon, silicon calcium, silicon-zirconium alloy and ferromanganese alloy, and the nodulizer is one or more of rare earth magnesium and cerium-rich rare earth.
The technical scheme of the invention is further improved as follows: and B, adding the inoculant into the outer layer in the step B in a mode of adding the inoculant along with the flow or adding the inoculant into the bottom of the ladle.
The technical scheme of the invention is further improved as follows: and B, when the core molten steel is poured in the step B, when the temperature of the outer layer molten steel cavity is 950-1150 ℃, 10-20% of the total required quantity is poured, and the core molten iron quantity is further poured after the pouring is finished for 10-20 min.
The technical scheme of the invention is further improved as follows: and C, lengthening the axial allowance according to the size of the furnace body.
The technical scheme of the invention is further improved as follows: the high-temperature heat treatment in the step D is carried out at the furnace temperature of 950-.
The technical scheme of the invention is further improved as follows: the heat treatment mode in the step D is an annealing mode, the annealing temperature is 400-600 ℃, and the annealing heat preservation time is 30-60 h.
Due to the adoption of the technical scheme, the invention has the technical progress that:
according to the invention, the casting process parameters such as the components, the manufacturing mode, the spheroidizing process, the inoculation process, the pouring process and the like of the hot rolled plate strip finish rolling high-speed steel working roll and the heat treatment process are researched, the material components are specially designed through the action mechanism of each alloy element in the special high-speed steel matrix, and the special high-speed steel working roll has excellent roll surface maintaining and accident resisting capabilities while ensuring that the outer layer of a special high-speed steel product has good wear resistance. By special design of components, the carbide content is improved and the tempering resistance is increased in the actual use process, the on-machine period of the roller is prolonged, and the lubricating phase graphite is generated by adopting a special inoculant mode, so that the finish rolling machine frame, particularly the finished high-speed steel of the machine frame, has good accident resistance and roller surface retention capacity. And a centrifugal compounding mode is adopted, so that good comprehensive properties such as high alloy of the outer layer, high toughness of the core part and the like are ensured. Meanwhile, aiming at the characteristic that the finished product rack is frequently thrown with steel, lubricating phase graphite is added, so that the high-speed steel for finish rolling, particularly the finished product rack, has high accident resistance, the rough resistance of the roll surface is increased, and the high surface quality of the finish rolling rack, particularly the finished product rack, is maintained.
Drawings
FIG. 1 is a photograph of a 500 Xstructure in which carbides are dispersed and the structure is martensite or residual austenite + carbides.
Detailed Description
A preparation method of a hot-rolled plate strip finish-rolled high-speed steel working roll comprises the following steps:
step A, when the smelting molten iron meets the corresponding component requirements, the outer layer molten steel smelting temperature is 1400-;
step B, after the smelting components reach the standard, the molten iron on the outer layer and the core is electrically heated to the temperature of 1500-;
and step C, opening the box after pouring for 80-100 hours, and performing rough machining after opening the box, wherein the allowance in the diameter direction of the rough roller body is 5-15mm, and the allowance in the axial direction is 5-200 mm.
And D, after the rough machining is finished, quenching and heating the roller body in a high-temperature heat treatment mode and carrying out overall tempering treatment.
And E, finishing and detecting after quenching and tempering until a finished product is obtained.
The composition range of the outer layer alloy in the step A and the step B is as follows: 1.0-4.0% of C, 0.8-8.0% of Si, 0.2-1.2% of Mn, less than or equal to 0.10% of P, less than or equal to 0.1% of S, 1.0-8.0% of Cr1, 2.0-10.0% of Ni0, 0.5-10.0% of Mo0.1-8.0% of V, W: 0.1 to 6.0 percent of Nb, less than or equal to 1.0 percent of Nb, and the balance of Fe; the chemical composition range of the core is C2.3-4.0%, Si 1.0-4.0%, Mn 0.1-1.0%, P is less than or equal to 0.10%, S is less than or equal to 0.1%, Cr is less than or equal to 1.0%, Ni is less than or equal to 2.0%, Mo0.1-3.0%, W + V + Nb is less than or equal to 0.8%, and the balance is iron. In the W + V + Nb content less than or equal to 0.8%, W, V, Nb may be three, two, any one or none.
The raw materials smelted in the step A can be directly smelted by waste materials, and also can be compounds of multi-component alloys, or raw materials of ferrovanadium, ferroMo and the like as long as the component proportion meets the requirement of an alloy range.
The inoculant in the step B can be ferrosilicon, silicon calcium, silicon zirconium alloy and ferromanganese alloy, the nodulizer is rare earth magnesium, cerium-rich rare earth and the like, one or more of the nucleating agents can be selected, and other nodulizing inoculants can also be adopted for replacing.
And B, when the core molten steel amount in the step B is poured, firstly pouring 10-20% of the total required amount when the temperature of the outer layer molten steel cavity is 950-1150 ℃, and further pouring the core molten iron amount after pouring is finished for 10-20 min.
And C, lengthening the axial allowance according to the size of the furnace body.
The parameters of the high-temperature heat treatment mode in the step D can be selected from the furnace body temperature of 950-.
The present invention will be described in further detail with reference to the following examples:
example 1
Scrap steel scraps, forged steel stub bars, ferromolybdenum, ferrovanadium and electrode powder are used as raw materials, and smelting is carried out by adopting an intermediate frequency furnace, so that the design component range of high-speed steel is reached: 1.98% of outer molten iron C, 1.56% of Si, 0.9% of Mn0.06% of P, 0.07% of S, 3.56% of Cr3, 2.51% of Ni2, 0.85% of Mo0, 2.39% of V, 0.96% of W and the balance of Fe; the core molten iron comprises 2.93% of C, 1.32% of Si, 0.75% of Mn0.06% of P, 0.08% of S, 0.03% of Cr0.03%, 0.23% of Ni0.25%, 0.05% of W + V + Nb and the balance of Fe. Smelting the outer layer at 1590 ℃, heating to 1630 ℃ after the components reach standards, then discharging from a furnace for centrifugal casting, adopting a ladle-turning ladle as the outer layer, adding an inoculant along with the flow when casting, smelting the molten steel at the core part at 1450 ℃, adopting a bottom-leakage ladle, pouring in a mode of adding a nodulizer inoculant at the bottom of the ladle, adopting a steel plate gland with the thickness of 10-20mm above the nodulizer, covering the periphery of the steel plate with scrap steel, adding 1-5% of nodulizer into the molten steel at the core part, pouring for 2 times, performing heat treatment at a first pouring temperature of 1395 ℃, pouring 10-20% of the total required amount of the first pouring, performing air cooling at a second pouring temperature of 1320 ℃, completing the molten iron amount of the core part, performing cold box opening after 95h of pouring, performing heat treatment by adopting a differential heating mode, heating at 990 ℃ for 160min, blowing air for 130min on the roller body, then performing air cooling at a roller body at 400 ℃ for 35h, and tempering for more than two times.
Example 2
Scrap steel scraps, forged steel stub bars, ferromolybdenum, ferrovanadium and electrode powder are used as raw materials, and smelting is carried out by adopting an intermediate frequency furnace, so that the design component range of high-speed steel is reached: 1.98% of outer molten iron C, 1.56% of Si, 0.9% of Mn0.06% of P, 0.07% of S, 3.59% of Cr3, 2.58% of Ni2, 0.89% of Mo0, 2.45% of V, 0.91% of W and the balance of Fe; the core molten iron comprises 2.93% of C, 1.32% of Si, 0.75% of Mn0.06% of P, 0.08% of S, 0.03% of Cr0.03%, 0.23% of Ni0.25%, 0.05% of W + V + Nb and the balance of Fe. Smelting the outer layer at 1550 ℃, heating to 1750 ℃ after the components reach the standard, then discharging from a furnace for centrifugal casting, adopting a ladle-turning ladle as the outer layer, adding an inoculant into the ladle bottom during casting, adding an inoculant into the molten steel of the core part at 1350 ℃, adopting bottom-leakage ladle turning, adding a nodulizer inoculant into the ladle bottom, casting the molten steel of the core part for 2 times, casting at 1395 ℃ for the first time, casting at 1320 ℃ for the second time, cooling and unpacking the roll body for 95h after casting is finished, roughly adding 28mm of axial allowance and 10mm of radial diameter allowance, performing heat treatment by adopting a differential heating mode, heating at 1010 ℃ for 130min, air cooling the roll body after blowing for 90min, loading the roll body into the furnace for tempering for 39h when the roll body is 400 ℃, and tempering for more than two times.
Example 3
Scrap steel scraps, forged steel stub bars, ferromolybdenum, ferrovanadium and electrode powder are used as raw materials, and smelting is carried out by adopting an intermediate frequency furnace, so that the design component range of high-speed steel is reached: 1.81% of outer molten iron C, 1.46% of Si, 0.85% of Mn0.05%, 0.07% of S, 3.56% of Cr3, 2.51% of Ni2, 0.89% of Mo0, 2.39% of V, 0.96% of W and the balance of Fe; the core molten iron comprises 2.93% of C, 1.32% of Si, 0.75% of Mn0.06% of P, 0.08% of S, 0.03% of Cr0.03%, 0.23% of Ni0.25%, 0.05% of W + V + Nb and the balance of Fe. Smelting the outer layer at 1590 ℃, heating to 1630 ℃ after the components reach the standard, discharging from the furnace, centrifugally casting, casting the molten steel at the core part at 1450 ℃, casting the molten steel at the core part at 2 times, casting at 1395 ℃ for the first time and 1320 ℃ for the second time, cooling and opening the box after casting for 95h, roughly adding 28mm of axial allowance and 10mm of axial allowance in the radial diameter direction, performing heat treatment in a differential heating mode, heating for 150min at 1030 ℃, spraying air to the roller body for 70min, then performing air cooling, loading and tempering for 41h when the roller body is 450 ℃, and performing tempering for more than two times.
Example 4
Scrap steel scraps, forged steel stub bars, ferromolybdenum, ferrovanadium and electrode powder are used as raw materials, and smelting is carried out by adopting an intermediate frequency furnace, so that the design component range of high-speed steel is reached: 1.99% of outer layer molten iron C, 1.89% of Si, 0.89% of Mn0.09% of P, 0.09% of S, 3.43% of Cr3, 2.93% of Ni2, 0.91% of Mo0, 2.99% of V, 0.85% of W and the balance of Fe; the core molten iron comprises 3.12% of C, 1.21% of Si, 0.89% of Mn0.09% of P, 0.07% of S, 0.05% of Cr0.05%, 0.19% of Ni0.29%, 0.09% of W + V + Nb and the balance of Fe. Smelting the outer layer at the temperature of 1610 ℃, heating to 1629 ℃ after the components reach the standard, then discharging from the furnace, centrifugally pouring, wherein the smelting temperature of molten steel of the core part is 1450 ℃, the water content of the steel of the core part is poured for 2 times, the first pouring temperature is 1395 ℃, the second pouring temperature is 1312 ℃, after the pouring is finished, the box is cooled and opened for 93 hours, the axial allowance is increased roughly and the axial allowance is 28mm, the allowance in the radial diameter direction is 10mm, the heat treatment is carried out by adopting a differential heating mode, the heating is carried out for 110min at the temperature of 1100 ℃, the air cooling is carried out after the air blowing is carried out for 65min on the roller body, the furnace loading and the tempering are carried out for 36 hours when the roller body is at the temperature of 430 ℃, and the tempering is carried out for more than two times.
Example 5
Scrap steel scraps, forged steel stub bars, ferromolybdenum, ferrovanadium and electrode powder are used as raw materials, and smelting is carried out by adopting an intermediate frequency furnace, so that the design component range of high-speed steel is reached: outer molten iron C2.23%, Si 1.99%, Mn0.93%, P0.09%, S0.08%, Cr3.65%, Ni2.98%, Mo0.96%, V2.85%, W0.89%, and the balance of Fe; the core molten iron comprises 3.15% of C, 1.23% of Si, 0.85% of Mn0.08% of P, 0.06% of S, 0.07% of Cr0.16% of Ni0.16% of Mo, 0.08% of W + V + Nb and the balance of Fe. Smelting the outer layer at 1620 ℃, heating to 1680 ℃ after the components reach the standard, then discharging from the furnace for centrifugal casting, carrying out casting at 1455 ℃ of the melting temperature of the molten steel of the core part, carrying out casting for 2 times of the water content of the steel of the core part, carrying out heat treatment in a differential heating mode at 1393 ℃ of the first casting temperature and 1313 ℃ of the second casting temperature, carrying out cold box opening after casting is finished for 92 hours, carrying out rough axial allowance of 27mm and radial diameter allowance of 11mm, carrying out heating at 1105 ℃ for 112min, carrying out air cooling after 75min of air blowing of the roller body, loading the roller body at 470 ℃ in the furnace for tempering for 39 hours, and carrying out tempering for more than two times.
Example 6
Scrap steel scraps, forged steel stub bars, ferromolybdenum, ferrovanadium and electrode powder are used as raw materials, and smelting is carried out by adopting an intermediate frequency furnace, so that the design component range of high-speed steel is reached: the outer layer molten iron comprises 2.31% of C, 1.99% of Si, 0.85% of Mn0.081% of P, 0.069% of S, 3.51% of Cr3, 2.81% of Ni2, 0.89% of Mo0, 2.71% of V, 0.71% of W and the balance of Fe; the core molten iron comprises 3.11% of C, 1.23% of Si, 0.85% of Mn0.08% of P, 0.06% of S, 0.07% of Cr0.16% of Ni0.16% of Mo, 0.08% of W + V + Nb and the balance of Fe. Smelting the outer layer at 1620 ℃, heating to 1721 ℃ after the components reach the standard, then discharging from the furnace, centrifugally casting, wherein the smelting temperature of molten steel of the core part is 1451 ℃, the water content of steel of the core part is cast for 2 times, the first casting temperature is 1389 ℃, the second casting temperature is 1301 ℃, after the casting is finished, the box is cooled and opened for 105h, the axial allowance is increased roughly to 27mm, the allowance in the radial diameter direction is 11mm, heat treatment is carried out in a differential heating mode, heating is carried out for 180min at 985 ℃, air cooling is carried out after a roller body is blown for 66min, the roller body is placed in the furnace for 45h when the temperature is 430 ℃, and tempering is carried out for more than two times.
Example 7
Example 7 is a control, a conventional high nickel chromium mill roll.
Example 8
Example 8 is a control, a conventional high speed steel mill roll.
FIG. 1 is a photograph of a 500 Xstructure of example 1, in which carbides are dispersed and the structure is martensite or austenite-remaining + carbides.
The products of the embodiments 1 to 8 are taken to carry out the tensile mechanical property detection of the sample, and the performance detection execution national standard GB/T228. the detection result is shown in the table 1.
Table 1 EXAMPLES Performance test results
Figure BDA0003415906000000081
By testing the performance of the developed special high-speed steel for the hot-rolled plate strip finish rolling stand, the wear resistance of the developed special working roll is equivalent to that of the conventional high-speed steel, and the accident resistance of the developed special working roll is obviously higher than that of the conventional high-speed steel working roll.
According to the performance detection result, the developed high-speed steel working roll for the hot-rolled plate strip has good wear resistance and accident resistance, can better adapt to the working condition characteristics of finish rolling, particularly steel throwing of a finished product rack, and has the machine period more than 2 times that of a conventional high-nickel-chromium working roll.

Claims (10)

1. The preparation method of the hot-rolled plate strip finish-rolled high-speed steel working roll is characterized by comprising the following steps of:
step A, when the smelting molten iron meets the corresponding component requirements, the outer layer molten steel smelting temperature is 1400-;
step B, after the smelting components reach the standard, the molten iron on the outer layer and the core is electrically heated to the temperature of 1500-;
step C, opening the box after pouring for 80-100 hours, and then roughly machining the roller body, wherein the allowance in the diameter direction is 5-15mm, and the allowance in the axial direction is 5-200 mm;
d, after the rough machining is finished, quenching and heating the roller body in a high-temperature heat treatment mode and carrying out overall tempering treatment;
and E, finishing and detecting after quenching and tempering until a finished product is obtained.
2. The method for manufacturing a hot-rolled strip finish-rolled high-speed steel work roll according to claim 1, wherein the ranges of the outer alloy components in the step a and the step B are as follows: 1.0-4.0% of C, 0.8-8.0% of Si, 0.2-1.2% of Mn, less than or equal to 0.10% of P, less than or equal to 0.1% of S, 1.0-8.0% of Cr1, 2.0-10.0% of Ni0, 0.5-10.0% of Mo0.1-8.0% of V, W: 0.1 to 6.0 percent of Nb, less than or equal to 1.0 percent of Nb, and the balance of Fe; the chemical composition range of the core is C2.3-4.0%, Si 1.0-4.0%, Mn 0.1-1.0%, P is less than or equal to 0.10%, S is less than or equal to 0.1%, Cr is less than or equal to 1.0%, Ni is less than or equal to 2.0%, Mo0.1-3.0%, W + V + Nb is less than or equal to 0.8%, and the balance is iron.
3. The method for preparing the hot-rolled plate strip finish-rolled high-speed steel working roll according to claim 2, which is characterized in that: w, V, Nb are selected to be three, two, any one or none of them.
4. The method for preparing the hot-rolled plate strip finish-rolled high-speed steel working roll according to claim 1, which is characterized in that: the raw materials smelted in the step A are selected from waste direct smelting, compound of multi-component alloy or raw materials of ferrovanadium, Mo iron and the like.
5. The method for preparing the hot-rolled plate strip finish-rolled high-speed steel working roll according to claim 1, which is characterized in that: the inoculant in the step B is one or more of ferrosilicon, silicon calcium, silicon-zirconium alloy and ferromanganese alloy, and the nodulizer is one or more of rare earth magnesium and cerium-rich rare earth.
6. The method for preparing the hot-rolled plate strip finish-rolled high-speed steel working roll according to claim 1, which is characterized in that: and B, adding the inoculant into the outer layer in the step B in a mode of adding the inoculant along with the flow or adding the inoculant into the bottom of the ladle.
7. The method for preparing the hot-rolled plate strip finish-rolled high-speed steel working roll according to claim 1, which is characterized in that: and B, when the core molten steel is poured in the step B, when the temperature of the outer layer molten steel cavity is 950-1150 ℃, 10-20% of the total required quantity is poured, and the core molten iron quantity is further poured after the pouring is finished for 10-20 min.
8. The method for preparing the hot-rolled plate strip finish-rolled high-speed steel working roll according to claim 1, which is characterized in that: and C, lengthening the axial allowance according to the size of the furnace body.
9. The method for preparing the hot-rolled plate strip finish-rolled high-speed steel working roll according to claim 1, which is characterized in that: the high-temperature heat treatment in the step D is carried out at the furnace temperature of 950-.
10. The method for preparing the hot-rolled plate strip finish-rolled high-speed steel working roll according to claim 1, which is characterized in that: the heat treatment mode in the step D is an annealing mode, the annealing temperature is 400-600 ℃, and the annealing heat preservation time is 30-60 h.
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