CN115558768A - Method for processing quenching interruption of large semi-high-speed steel hot roll - Google Patents

Method for processing quenching interruption of large semi-high-speed steel hot roll Download PDF

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CN115558768A
CN115558768A CN202211350884.4A CN202211350884A CN115558768A CN 115558768 A CN115558768 A CN 115558768A CN 202211350884 A CN202211350884 A CN 202211350884A CN 115558768 A CN115558768 A CN 115558768A
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percent
speed steel
temperature
quenching
steel hot
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王文明
兰勇
陈伟
张大伟
李北玉
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Baosteel Roll Science & Technology Co ltd
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Baosteel Roll Science & Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/37—Single-purpose machines or devices for grinding rolls, e.g. barrel-shaped rolls
    • 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
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
    • 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
    • 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
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • 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
    • C21D2261/00—Machining or cutting being involved
    • 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
    • Y02P10/25—Process efficiency

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Abstract

The invention discloses a method for processing quenching interruption of a large semi-high-speed steel hot roller, which comprises the steps of oven heat preservation, high-temperature tempering, machine tool induction annealing and final heat treatment; the machine tool induction annealing comprises the steps of integrally preheating in an oven, then carrying out machine tool induction annealing on a power frequency induction quenching machine tool, and finally, preserving heat in the oven; the final heat treatment comprises the steps of integrally preheating in an oven, then carrying out surface quenching on a power frequency induction quenching machine tool, and finally carrying out twice tempering treatment. The treatment method can enable the large semi-high-speed steel hot roll with interrupted quenching to meet the performance requirement, and avoids using quenching and tempering treatment, thereby not only reducing the cost consumption of heat treatment, but also avoiding the fracture easily caused by re-quenching; the treatment method only needs to carry out polishing processing on the roller body chamfer and the roller body before surface quenching, and does not need integral semi-finish turning, thereby reducing the cost consumption of cold processing.

Description

Method for processing quenching interruption of large semi-high-speed steel hot roll
Technical Field
The invention belongs to the technical field of large semi-high-speed steel hot rolls, and particularly relates to a method for processing quenching interruption of a large semi-high-speed steel hot roll.
Background
With the continuous improvement of steel rolling technology and the quality requirement of rolled products, the roller is required to be capable of adapting to long-period rolling and has high accident resistance, good wear resistance and high roughness retentivity. The materials capable of meeting these requirements mainly include alloy steel grades such as semi-high speed steel and high speed steel.
The large semi-high speed steel hot roller has the characteristics of high hardness, deep hardening layer, obvious secondary hardening effect, good thermal shock resistance, capability of keeping the hardness and the stability of the structure under the action of larger thermal shock, great improvement on the service life of the roller and the like.
The specifications of the large semi-high speed steel hot roll are as follows: the diameter of the roller body is 660-1200 mm, and the length of the roller body is 1100-2450 mm.
The materials of the large semi-high speed steel hot roll are generally as follows: 0.35 to 1.00 percent of carbon; 0.40 to 1.60 percent of silicon; 0.10 to 0.50 percent of manganese; phosphorus is less than or equal to 0.015 percent; sulfur is less than or equal to 0.010 percent; 4.00 to 8.50 percent of chromium; 0.10 to 0.60 percent of nickel; 0.40 to 2.50 percent of molybdenum; 0.20 to 2.50 percent of vanadium; the balance of iron and inevitable impurities.
However, in the manufacturing process of the large semi-high-speed hot rolled steel roll, quenching is interrupted due to explosion damage of the compensation capacitor, high-pressure jump and the like. For the large-size semi-high-speed steel hot roll with large specification, no precedent of machine tool re-quenching is adopted, but the product has very high value, and the direct scrapping can cause great loss.
At present, a regeneration treatment method is generally adopted for a roller with interrupted quenching, namely, quenching and tempering treatment and final heat treatment need to be carried out again, so that not only is energy consumption large, but also the re-quenching and tempering treatment for a large semi-high-speed steel hot roller can cause insufficient allowance, and related requirements are difficult to achieve.
Disclosure of Invention
The invention aims to solve the problems and provides a method for processing quenching interruption of a large semi-high-speed steel hot roll.
The technical scheme for realizing the purpose of the invention is as follows: a treatment method for quenching interruption of a large semi-high-speed steel hot roll comprises the following steps:
s1: and (5) keeping the temperature of the oven.
And (3) placing the large semi-high-speed steel hot roll with the quenching interruption in a drying oven at the temperature of 250-400 ℃, preserving the heat, placing for 12-48 h, and then air-cooling to room temperature.
S2: and (4) high-temperature tempering.
Heating the large semi-high speed steel hot roll insulated by the oven in the step S1 to 200-400 ℃ and integrally preheating for 6-12 h; then heating to 580-630 ℃, tempering at high temperature for 24-64 h, and finally air cooling to room temperature.
S3: and (5) induction annealing by a machine tool.
After high-temperature tempering, because of the existence of the hardness abrupt-drop zone, the direct surface quenching treatment has the risk of roll breakage. Therefore, a machine bed induction annealing process is required to be carried out, which comprises the following steps:
s31: and (3) placing the large half-high-speed steel hot roll tempered at the high temperature in the step (S2) into a drying oven, firstly heating to 200-400 ℃, carrying out primary integral preheating for 6-18 h, then heating to 350-550 ℃, and carrying out secondary integral preheating for 9-27 h.
S32: and (3) placing the large semi-high-speed steel hot roll subjected to integral preheating of the oven in the step (S31) on a power frequency induction quenching machine tool, heating to 720-750 ℃ at the speed of an induction coil of 0.8-1.2 mm/S, carrying out first machine tool induction annealing, heating to 830-870 ℃ at the speed of the induction coil of 0.4-0.6 mm/S, and carrying out second machine tool induction annealing.
S33: and (3) placing the large semi-high-speed steel hot roll subjected to the induction annealing by the machine tool in the step (S32) in a drying oven at the temperature of 250-400 ℃, preserving the heat, placing for 40-80 h, and then air-cooling to room temperature.
In the step S31, in the second integral preheating stage, the high point at the lower end of the roll neck is downward during charging, and is supported by refractory bricks, so that the deformation is reduced, and the problem that the finished product cannot be processed is avoided.
Before the machine tool induction annealing in the step S3 (namely after the high-temperature tempering in the step S2), the surface wave flaw detection and the magnetic powder flaw detection are carried out on the large-sized semi-high-speed steel hot roll, and the method can be carried out only if no crack defects exist.
S4: and (4) final heat treatment.
S41, placing the large half-high-speed steel hot roll subjected to induction annealing by the machine tool in the step S3 in a baking oven, heating to 200-400 ℃ for first integral preheating for 6-18 h, and then heating to 500-650 ℃ (the temperature is 50-100 ℃ higher than that of the integral preheating before conventional quenching) for second integral preheating for 9-27 h.
S42, placing the large semi-high-speed steel hot roll subjected to the tempering integral preheating in the step S41 on a power frequency induction quenching machine tool, heating to 800-850 ℃ at the induction coil speed of 1.0-1.5 mm/S (50-80 ℃ higher than the conventional heating temperature), and then heating to 1010-1050 ℃ at the induction coil speed of 0.4-0.6 mm/S for surface quenching.
S43, first tempering: first low-temperature tempering treatment is carried out for 6-18 h at the temperature of 90-190 ℃, then first high-temperature tempering treatment is carried out for 60-96 h at the temperature of 450-580 ℃, and finally air cooling is carried out to the room temperature.
S44, tempering for the second time: firstly, carrying out secondary low-temperature tempering treatment at the temperature of 90-190 ℃ for 6-18 h, then carrying out secondary high-temperature tempering treatment at the temperature of 430-560 ℃ for 60-96 h, and finally air-cooling to room temperature.
The diameter of the roll body of the large semi-high speed steel hot roll is 660-1200 mm, and the length of the roll body is 1100-2450 mm.
The large semi-high speed steel hot roll comprises the following components in percentage by weight: 0.35 to 1.00 percent of carbon; 0.40 to 1.60 percent of silicon; 0.10 to 0.50 percent of manganese; phosphorus is less than or equal to 0.015 percent; sulfur is less than or equal to 0.010 percent; 4.00 to 8.50 percent of chromium; 0.10 to 0.60 percent of nickel; 0.40 to 2.50 percent of molybdenum; 0.20 to 2.50 percent of vanadium; the balance of iron and inevitable impurities.
Preferably, the large semi-high speed steel hot roll comprises the following components in percentage by weight: 0.35 to 0.65 percent of carbon; 0.80 to 1.60 percent of silicon; 0.10 to 0.50 percent of manganese; phosphorus is less than or equal to 0.015 percent; sulfur is less than or equal to 0.010 percent; 4.00 to 8.50 percent of chromium; 0.10 to 0.40 percent of nickel; 1.00 to 2.50 percent of molybdenum; 0.20 to 0.60 percent of vanadium; the balance of iron and inevitable impurities.
The invention has the following positive effects:
(1) The treatment method can enable the large semi-high-speed steel hot roll with interrupted quenching to meet the performance requirement, avoids using quenching and tempering, reduces the cost consumption of heat treatment, and can avoid fracture easily caused by re-quenching.
(2) The treatment method only needs to carry out polishing processing on the roller body chamfer and the roller body before surface quenching, and does not need integral semi-finish turning, thereby reducing the cost consumption of cold processing.
Detailed Description
(example 1)
The specification of the large semi-high speed steel hot roll of the embodiment is as follows: the diameter of the roller body is 900mm, and the length of the roller body is 1850mm.
The large half-high-speed steel hot roll comprises the following components in percentage by weight: 0.45% of carbon; 1.10% of silicon; 0.25 percent of manganese; phosphorus is less than or equal to 0.015 percent; sulfur is less than or equal to 0.010 percent; 5.50 percent of chromium; 0.25% of nickel; 1.50% of molybdenum; 0.40 percent of vanadium.
The technical requirements of the large-scale semi-high-speed steel hot roll of the embodiment are as follows: the surface hardness of the roller body is 75-85 HSD, the depth of a hardening layer is more than or equal to 35mm, and the scrap hardness is less than or equal to 70HSD.
The treatment method for quenching interruption of the large semi-high-speed steel hot roll comprises the following steps:
s1: and (5) keeping the temperature of the oven.
And (3) placing the large semi-high-speed steel hot roll with the quenching interruption in a baking oven at 325 +/-5 ℃, preserving the heat for 30 hours to avoid cold-state failure, and then air-cooling to room temperature.
S2: and (4) high-temperature tempering.
And (3) heating the large semi-high speed steel hot roll subjected to heat preservation in the oven in the step S1 to 300 +/-5 ℃, integrally preheating for 9 hours, then heating to 605 +/-5 ℃, performing high-temperature tempering for 44 +/-2 hours, and finally air cooling to room temperature.
After high-temperature tempering, carrying out surface hardness detection on the large half-high-speed steel hot roller, specifically, testing 4 buses on the surface of the roller body, wherein each bus takes 5 points (the middle part of the roller body, two ends of the roller body and the middle part between the middle part of the roller body and two ends of the roller body), so that the hardness range is 31-49 HSD, and the hardness uniformity is extremely poor. Wherein, the hardness range from the water spraying area to the junction area is 40-49 HSD, the hardness range from the annealing area to the junction area is 31-40 HSD, a hardness suddenly-reduced area exists, and the direct surface quenching treatment has the risk of roll breakage.
After high-temperature tempering, surface wave flaw detection and magnetic powder flaw detection are carried out on the large semi-high-speed steel hot roller, and no crack defect is generated.
S3: and (5) induction annealing of the machine tool.
S31: and (3) placing the large-scale semi-high-speed steel hot roll subjected to high-temperature tempering in the step (S2) in a drying oven, heating to 300 +/-5 ℃ firstly, performing primary integral preheating for 12 hours, and heating to 450 +/-5 ℃ again, and performing secondary integral preheating for 18 hours.
And in the second integral preheating stage, the high point at the lower end of the roll neck is downward during charging, and the refractory bricks are adopted for supporting, so that the deformation is reduced, and the problem that finished products cannot be processed is avoided.
S32: and (3) placing the large semi-high-speed steel hot roll subjected to integral preheating of the oven in the step (S31) on a power frequency induction quenching machine tool, heating to 735 +/-5 ℃ at the speed of an induction coil of 1.0mm/S, carrying out first machine tool induction annealing, heating to 850 +/-5 ℃ at the speed of the induction coil of 0.5mm/S, and carrying out second machine tool induction annealing.
S33: and (3) placing the large semi-high-speed steel hot roll subjected to the induction annealing of the machine tool in the step (S32) in a drying oven at the temperature of 325 +/-5 ℃, preserving the heat, placing for 60 hours, and then air-cooling to room temperature.
After the induction annealing of the machine tool, the surface hardness of the large semi-high-speed steel hot roll is detected, the method is the same, the hardness range is 30-37 HSD, the hardness uniformity is obviously improved, and a hardness abrupt-reduction region does not exist.
After the induction annealing of the machine tool, rough machining is required to be carried out firstly, and the specific requirements are as follows: (1) chamfering the end to C30 or above; (2) processing two ends of the chamfer angle into R5, and processing the polishing roughness into Ra0.8-1.6; (3) the polishing roughness of the roller body and the transition area is Ra0.8-1.6.
And after rough machining, performing UT conventional flaw detection on the roller body, and performing magnetic powder + SUT flaw detection on the transition region, wherein the result is free of crack defects.
S4: and (4) final heat treatment.
S41, placing the large semi-high speed steel hot roll subjected to the induction annealing by the machine tool in the step S3 in a baking oven, firstly heating to 300 +/-5 ℃, carrying out primary integral preheating for 12 hours, then heating to 575+5 ℃ (70-80 ℃ higher than the integral preheating temperature before conventional quenching), and carrying out secondary integral preheating for 18 hours.
S42, placing the integrally preheated large semi-high-speed steel hot roll in the step S41 on a power frequency induction quenching machine tool, heating to 825 +/-5 ℃ at the induction coil speed of 1.2mm/S (60-70 ℃ higher than the conventional heating temperature), and then heating to 1030 +/-5 ℃ at the induction coil speed of 0.5mm/S for surface quenching treatment.
The specification of the induction coil adopted by the embodiment is phi 950 multiplied by 230mm, the water pressure is more than or equal to 0.2MPa, and the continuous cooling time is 165-170 min.
S43, first tempering: first low-temperature tempering treatment is carried out for 12 hours at the temperature of 140 +/-5 ℃, then first high-temperature tempering treatment is carried out for 78 +/-2 hours at the temperature of 515 +/-5 ℃, and finally air cooling is carried out to the room temperature.
S44, tempering for the second time: firstly carrying out secondary low-temperature tempering treatment at the temperature of 140 +/-5 ℃ for 12h, then carrying out secondary high-temperature tempering treatment at the temperature of 495 +/-5 ℃ for 78 +/-2 h, and finally air-cooling to room temperature.
The surface hardness of the large semi-high-speed steel hot roll finished product treated in the example 1 is detected by the same method, and the result shows that the hardness ranges from 80 HSD to 82HSD and the hardness uniformity is good; the depth of the hardened layer was also measured, and the result was 37.5mm.
(examples 2 to 3)
The preparation method of each example is basically the same as that of example 1, except that: the specification, the material and the heat treatment process conditions of the large semi-high-speed steel hot roll are shown in table 1.
TABLE 1
Example 1 Example 2 Example 3
Diameter of roll body 900mm 720mm 1050mm
Length of roll body 1850mm 1200mm 2400mm
Carbon (C) 0.45% 0.40% 0.55%
Silicon 1.10% 0.90% 1.25%
Manganese oxide 0.25% 0.20% 0.35%
Chromium (III) 5.50% 4.20% 6.90%
Nickel (II) 0.25% 0.20% 0.30%
Molybdenum (Mo) 1.50% 1.20% 1.80%
Vanadium oxide 0.40% 0.25% 0.50%
S2 high temperature tempering temperature and time 605±5℃、44±2h 590±5℃、38±2h 620±5℃、50±2h
S32 machine tool induction annealing temperature 735±5℃、850±5℃ 725±5℃、840±5℃ 745±5℃、860±5℃
S42 surface hardening temperature 825±5℃、1030±5℃ 810±5℃、1020±5℃ 840±5℃、1040±5℃
Hardness range after high temperature tempering 31～49HSD 28～45HSD 35～55HSD
Hardness range after machine tool induction annealing 30～37HSD 28～35HSD 32～40HSD
Surface hardness of finished roll body 80～82HSD 78～80HSD 81～83HSD
Depth of hardened layer of finished product 37.5mm 36mm 38.5mm

Claims (4)

1. A treatment method for quenching interruption of a large semi-high-speed steel hot roll is characterized by comprising the following steps:
s1: keeping the temperature of the oven;
placing the large semi-high-speed steel hot roll with the quenching interruption in a drying oven at the temperature of 250-400 ℃, preserving the heat, placing for 12-48 h, and then air-cooling to room temperature;
s2: high-temperature tempering;
heating the large semi-high speed steel hot roll insulated by the oven in the step S1 to 200-400 ℃ and integrally preheating for 6-12 h; then heating to 580-630 ℃, tempering at high temperature for 24-64 h, and finally air-cooling to room temperature;
s3: induction annealing by a machine tool;
s31: placing the large semi-high-speed steel hot roll tempered at the high temperature in the step S2 in a drying oven, firstly heating to 200-400 ℃, carrying out primary integral preheating for 6-18 h, then heating to 350-550 ℃, and carrying out secondary integral preheating for 9-27 h;
s32: placing the large half-high-speed steel hot roll integrally preheated by the oven in the step S31 on a power frequency induction quenching machine tool, heating to 720-750 ℃ at the line speed of an induction coil of 0.8-1.2 mm/S, carrying out first machine tool induction annealing, heating to 830-870 ℃ at the line speed of the induction coil of 0.4-0.6 mm/S, and carrying out second machine tool induction annealing;
s33: placing the large semi-high-speed steel hot roll subjected to induction annealing by the machine tool in the step S32 in a drying oven at the temperature of 250-400 ℃, preserving heat, placing for 40-80 h, and then air-cooling to room temperature;
s4: final heat treatment;
s41, placing the large semi-high-speed steel hot roll subjected to induction annealing by the machine tool in the step S3 in a baking oven, heating to 200-400 ℃ firstly, performing primary integral preheating for 6-18 h, heating to 500-650 ℃ secondly, and performing secondary integral preheating for 9-27 h;
s42, placing the large-scale semi-high-speed steel hot roll subjected to tempering integral preheating in the step S41 on a power frequency induction quenching machine tool, heating to 800-850 ℃ at the induction coil speed of 1.0-1.5 mm/S, and then heating to 1010-1050 ℃ at the induction coil speed of 0.4-0.6 mm/S for surface quenching;
s43, first tempering: firstly, carrying out first low-temperature tempering treatment at the temperature of 90-190 ℃ for 6-18 h, then carrying out first high-temperature tempering treatment at the temperature of 450-580 ℃ for 60-96 h, and finally air-cooling to room temperature;
s44, tempering for the second time: firstly, carrying out secondary low-temperature tempering treatment at the temperature of 90-190 ℃ for 6-18 h, then carrying out secondary high-temperature tempering treatment at the temperature of 430-560 ℃ for 60-96 h, and finally air-cooling to room temperature.
2. The method for handling quench interruptions in hot rolls of large semi-high speed steel according to claim 1, characterized in that: the large semi-high speed steel hot roll comprises the following components in percentage by weight: 0.35 to 1.00 percent of carbon; 0.40 to 1.60 percent of silicon; 0.10 to 0.50 percent of manganese; phosphorus is less than or equal to 0.015 percent; sulfur is less than or equal to 0.010 percent; 4.00 to 8.50 percent of chromium; 0.10 to 0.60 percent of nickel; 0.40 to 2.50 percent of molybdenum; 0.20 to 2.50 percent of vanadium; the balance of iron and inevitable impurities.
3. The method for handling quench interruptions in hot rolls of large semi-high speed steel according to claim 1, characterized in that: the large semi-high speed steel hot roll comprises the following components in percentage by weight: 0.35 to 0.65 percent of carbon; 0.80 to 1.60 percent of silicon; 0.10 to 0.50 percent of manganese; phosphorus is less than or equal to 0.015 percent; sulfur is less than or equal to 0.010 percent; 4.00 to 8.50 percent of chromium; 0.10 to 0.40 percent of nickel; 1.00 to 2.50 percent of molybdenum; 0.20 to 0.60 percent of vanadium; the balance of iron and inevitable impurities.
4. Method for the treatment of interruption of quenching of a hot large semi-high speed steel roll according to one of claims 1 to 3, characterized in that: the diameter of the roll body of the large semi-high speed steel hot roll is 660-1200 mm, and the length of the roll body is 1100-2450 mm.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62109926A (en) * 1985-11-08 1987-05-21 Kawasaki Steel Corp Manufacture of highly wear resistant rolling roll
CN104630637A (en) * 2015-01-30 2015-05-20 宝钢轧辊科技有限责任公司 Low-alloy high-speed steel cold rolling working roll and manufacturing method thereof
CN108251629A (en) * 2017-12-22 2018-07-06 宝钢轧辊科技有限责任公司 Using state induction quenching body of roll working lining regeneration method is carried out to scrapping support roll
CN109487160A (en) * 2018-12-10 2019-03-19 宜兴市永昌轧辊有限公司 A kind of novel semi high speed steel cold-rolling intermediate roll and preparation method thereof
CN112430784A (en) * 2020-10-30 2021-03-02 宝钢轧辊科技有限责任公司 High-hardness large forged steel support roller and manufacturing method thereof
CN112522501A (en) * 2020-12-02 2021-03-19 河南中原特钢装备制造有限公司 Annealing process of surface quenching interrupted roller made of Cr3 or Cr5

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62109926A (en) * 1985-11-08 1987-05-21 Kawasaki Steel Corp Manufacture of highly wear resistant rolling roll
CN104630637A (en) * 2015-01-30 2015-05-20 宝钢轧辊科技有限责任公司 Low-alloy high-speed steel cold rolling working roll and manufacturing method thereof
CN108251629A (en) * 2017-12-22 2018-07-06 宝钢轧辊科技有限责任公司 Using state induction quenching body of roll working lining regeneration method is carried out to scrapping support roll
CN109487160A (en) * 2018-12-10 2019-03-19 宜兴市永昌轧辊有限公司 A kind of novel semi high speed steel cold-rolling intermediate roll and preparation method thereof
CN112430784A (en) * 2020-10-30 2021-03-02 宝钢轧辊科技有限责任公司 High-hardness large forged steel support roller and manufacturing method thereof
CN112522501A (en) * 2020-12-02 2021-03-19 河南中原特钢装备制造有限公司 Annealing process of surface quenching interrupted roller made of Cr3 or Cr5

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