CN112410673B - High-speed steel roll for rolling ultrahigh-strength steel plate and manufacturing method thereof - Google Patents

High-speed steel roll for rolling ultrahigh-strength steel plate and manufacturing method thereof Download PDF

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CN112410673B
CN112410673B CN202011300503.2A CN202011300503A CN112410673B CN 112410673 B CN112410673 B CN 112410673B CN 202011300503 A CN202011300503 A CN 202011300503A CN 112410673 B CN112410673 B CN 112410673B
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CN112410673A (en
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陈伟
乔建平
侯兴慧
韩剑
张青
谢晶
罗昌
崔海峰
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Baosteel Roll Science & 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/115—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by spraying molten metal, i.e. spray sintering, spray 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
    • 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
    • C21D1/28—Normalising
    • 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
    • C21D1/32—Soft annealing, e.g. spheroidising
    • 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
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

The invention discloses a high-speed steel roll for rolling an ultrahigh-strength steel plate and a manufacturing method thereof, wherein the manufacturing method comprises the steps of smelting and forging a roll blank, performing preliminary heat treatment and performing final heat treatment; the chemical components and the weight percentage are as follows: 0.80 to 1.20 percent of carbon, 0.20 to 1.45 percent of silicon, 0.15 to 0.40 percent of manganese, 7.70 to 8.30 percent of chromium, 1.20 to 3.00 percent of molybdenum, 1.50 to 2.50 percent of vanadium, 0.80 to 2.00 percent of tungsten, 0.40 to 0.60 percent of niobium, less than or equal to 0.020 percent of phosphorus, less than or equal to 0.015 percent of sulfur, and the balance of iron and inevitable impurities. According to the invention, on one hand, by optimizing alloy components and content, on the other hand, the steel ingot is prepared by adopting spray forming instead of electroslag remelting and a high-temperature integral quenching process is adopted, and finally, the high-speed steel roller with integral hardness of more than or equal to 62HRC and internal structure grain size of 9-10 grade can be prepared, and the complicated working condition of rolling the ultrahigh-strength steel plate can be met.

Description

High-speed steel roll for rolling ultrahigh-strength steel plate and manufacturing method thereof
Technical Field
The invention belongs to the technical field of high-speed steel rolls, and particularly relates to a high-speed steel roll for rolling an ultrahigh-strength steel plate and a manufacturing method thereof.
Background
High-strength steel sheet generally refers to steel sheet having a yield strength of 210MPa or more, and among them, ultrahigh-strength steel sheet having a yield strength of more than 550MPa is also called. The steel plate has the advantages of high weight reduction potential, high collision absorption energy, high fatigue strength, low anisotropy and the like. With the development of domestic cold rolling technology, the ultra-high strength steel plate is widely applied to various industries, particularly in the automobile industry, and the rolled ultra-high strength steel plate gradually shows extremely high additional economic value.
Because the ultrahigh strength steel plate has various alloy elements, high content, large deformation resistance in the rolling process, larger difference between work hardening and common steel plates, and particularly larger rolling difficulty, the ultrahigh strength steel plate has higher comprehensive performance requirements on a rolling mill and a roller thereof in the rolling process, generally requires that the integral hardness of the roller is more than or equal to 62HRC, and has higher wear resistance and good accident resistance.
Chinese patent document CN106435370A discloses a special high-speed steel roll for cold-rolled high-strength automobile plates, which comprises the following chemical components in percentage by weight: 0.80 to 0.90 percent of carbon; 0.20 to 0.45 percent of silicon; 0.15 to 0.40 percent of manganese; 3.55 to 3.70 percent of chromium; 4.25 to 4.40 percent of molybdenum; 1.50 to 1.70 percent of vanadium; 5.30 to 5.45 percent of tungsten; phosphorus is less than or equal to 0.030 percent; sulfur is less than or equal to 0.030 percent; the balance of iron and inevitable impurities. The integral hardness of the high-speed steel roller exceeds 64HRC, and the complex working condition of rolling the ultrahigh-strength steel plate can be met. However, the high-speed steel made of the material is the same as M2 high-speed steel, and belongs to tungsten-molybdenum high-speed steel, namely, the content of tungsten and molybdenum is high, so that the production cost is high, and the high-speed steel is not suitable for industrial mass production.
Disclosure of Invention
The invention aims to solve the problems and provides a high-speed steel roll for rolling ultrahigh-strength steel plates, which has the integral hardness of more than or equal to 62HRC and is low in production cost, and a manufacturing method thereof.
The technical scheme for realizing the purpose of the invention is as follows: a method for manufacturing a high-speed steel roller for rolling ultrahigh-strength steel plates comprises the steps of smelting and forging a roller blank according to chemical components and weight percentages, performing preliminary heat treatment and performing final heat treatment.
The chemical components and the weight percentage are as follows: 0.80 to 1.20 percent of carbon, 0.20 to 1.45 percent of silicon, 0.15 to 0.40 percent of manganese, 7.70 to 8.30 percent of chromium, 1.20 to 3.00 percent of molybdenum, 1.50 to 2.50 percent of vanadium, 0.80 to 2.00 percent of tungsten, 0.40 to 0.60 percent of niobium, less than or equal to 0.020 percent of phosphorus, less than or equal to 0.015 percent of sulfur, and the balance of iron and inevitable impurities.
The smelting comprises electric furnace smelting, external refining, vacuum degassing and spray forming to prepare steel ingots, namely the spray forming is adopted to replace the conventional cast electrode bar and electroslag remelting after the vacuum degassing.
The technological parameters of the spray forming are as follows: the atomizing gas is nitrogen, the atomizing pressure is 0.3-0.6 MPa, the spraying distance is 400-500 mm, the spraying angle is 25-30 degrees, the diameter of the flow guide nozzle is 3.5-4.5 mm, and the spraying temperature is 1450-1550 ℃.
The preliminary heat treatment includes normalizing and spheroidizing annealing.
The normalizing temperature is 1030-1080 ℃ and the time is 1.5-2.6 h.
The spheroidizing annealing comprises two stages; the temperature of the first stage is 900-980 ℃ and the time is 6-8 h; the temperature of the second stage is 700-780 ℃ and the time is 12-16 h.
The final heat treatment includes high temperature bulk quenching and high temperature tempering.
The high-temperature integral quenching temperature is 1100-1150 ℃ and the time is 2-3 h.
The high-temperature tempering temperature is 520-580 ℃, and the time is 10-15 h.
The invention has the following positive effects: according to the invention, on one hand, by optimizing alloy components and contents (increasing chromium content, reducing tungsten and molybdenum contents and adding a small amount of niobium), on the other hand, spray forming is adopted to replace electroslag remelting to prepare steel ingots, and a high-temperature integral quenching process is adopted, so that a high-speed steel roll with integral hardness of more than or equal to 62HRC and internal structure grain size of 9-10 grade can be finally prepared, and the high-speed steel roll has good bending resistance, wear resistance and impact toughness, and can meet complex working conditions for rolling ultrahigh-strength steel plates.
Drawings
FIG. 1 is a photograph (magnified 400 times) of a metallographic structure of a high-speed steel roll for rolling an ultra-high strength steel sheet manufactured in example 1.
Detailed Description
(example 1)
The method for manufacturing the high-speed steel roll for rolling the ultrahigh-strength steel sheet of the embodiment comprises the following steps:
s1: smelting and forging a roller blank according to the following chemical components in percentage by weight: 0.95% of carbon, 0.45% of silicon, 0.30% of manganese, 8.05% of chromium, 1.80% of molybdenum, 1.90% of vanadium, 1.20% of tungsten, 0.50% of niobium, 0.012% of phosphorus, 0.008% of sulfur, and the balance of iron and inevitable impurities.
Wherein the smelting comprises electric furnace smelting, external refining, vacuum degassing and spray forming to prepare steel ingots.
Wherein the technological parameters of the spray forming are as follows: the atomizing gas is nitrogen, the atomizing pressure is 0.4MPa, the spraying distance is 470mm, the spraying angle is 27 degrees, the diameter of the flow guide nozzle is 4.0mm, and the spraying temperature is 1480 ℃.
The spray forming can make the internal structure of the roller blank more compact and uniform, and the carbide is finer and more uniformly distributed.
S2: and (4) performing preliminary heat treatment.
S21: normalizing at 1060 deg.C for 2h.
S22: spheroidizing annealing treatment: the temperature of the first stage is 950 ℃, and the time is 7h; the temperature of the second stage is 750 ℃, the time is 14 hours, and then the air cooling is carried out.
S3: and (4) final heat treatment.
S31: and integrally quenching at the high temperature of 1120 ℃ for 2.5 hours.
S32: high-temperature tempering is carried out for 12 hours at the temperature of 550 ℃.
Finally obtaining the high-speed steel roll with the integral hardness of 62.4HRC and the internal structure grain size of 9-10 grades.
The metallographic structure photograph of the high-speed steel roll for rolling the ultra-high strength steel plate manufactured in this example is shown in fig. 1, and it can be seen from fig. 1 that: the carbide is dispersed and distributed on the substrate in a granular shape and is distributed uniformly.
(examples 2 to 5)
The manufacturing method of the high-speed steel roll of each example is basically the same as that of example 1, except for the differences shown in table 1.
TABLE 1
Example 1 Example 2 Example 3 Example 4 Example 5
C 0.95% 0.80% 1.20% 0.95% 0.95%
Si 0.45% 0.80% 0.30% 0.45% 0.45%
Mn 0.30% 0.40% 0.15% 0.30% 0.30%
Cr 8.05% 7.70% 8.30% 8.05% 8.05%
Mo 1.80% 1.20% 3.00% 1.80% 1.80%
V 1.90% 2.50% 1.50% 1.90% 1.90%
W 1.20% 0.80% 2.00% 1.20% 1.20%
Nb 0.50% 0.40% 0.60% 0.50% 0.50%
P 0.012% 0.020% 0.020% 0.012% 0.012%
S 0.008% 0.015% 0.015% 0.008% 0.008%
Jet distance 470mm 470mm 470mm 400mm 500mm
Spray angle 27° 27° 27° 30° 25°
Injection temperature 1480℃ 1480℃ 1480℃ 1550℃ 1450℃
Normalizing 1060℃/2h 1060℃/2h 1060℃/2h 1080℃/1.5h 1030℃/2.6h
Spheroidizing annealing 950℃/7h；750℃/14h 950℃/7h；750℃/14h 950℃/7h；750℃/14h 980℃/6h； 780℃/12h 900℃/8h； 700℃/16h
High temperature bulk quenching 1120℃/2.5h 1120℃/2.5h 1120℃/2.5h 1150℃/2h 1100℃/3h
High temperature tempering 550℃/12h 550℃/12h 550℃/12h 580℃/10h 520℃/15h
Overall hardness 62.4HRC 62.5HRC 62.1HRC 62.7HRC 62.2HRC
Texture grain size Grade 9-10 Grade 9-10 Grade 9-10 Grade 9-10 Grade 9-10

Claims (2)

1. A manufacturing method of a high-speed steel roller for rolling an ultrahigh-strength steel plate comprises the steps of smelting and forging a roller blank according to chemical components and weight percentages, performing preliminary heat treatment and performing final heat treatment; the method is characterized in that: the chemical components and the weight percentage are as follows: 0.80 to 1.20 percent of carbon, 0.20 to 1.45 percent of silicon, 0.15 to 0.40 percent of manganese, 7.70 to 8.30 percent of chromium, 1.20 to 3.00 percent of molybdenum, 1.50 to 2.50 percent of vanadium, 0.80 to 2.00 percent of tungsten, 0.40 to 0.60 percent of niobium, less than or equal to 0.020 percent of phosphorus, less than or equal to 0.015 percent of sulfur, and the balance of iron and inevitable impurities; the smelting comprises electric furnace smelting, external refining, vacuum degassing and spray forming to prepare steel ingots; the technological parameters of the spray forming are as follows: the atomizing gas is nitrogen, the atomizing pressure is 0.3-0.6 MPa, the spraying distance is 400-500 mm, the spraying angle is 25-30 degrees, the diameter of the flow guide nozzle is 3.5-4.5 mm, and the spraying temperature is 1450-1550 ℃; the final heat treatment comprises high-temperature integral quenching and high-temperature tempering; the high-temperature integral quenching temperature is 1100-1150 ℃ and the time is 2-3 h; the high-temperature tempering temperature is 520-580 ℃, and the time is 10-15 h.
2. The method for manufacturing a high-speed steel roll for rolling an ultra-high strength steel sheet as claimed in claim 1, wherein: the preliminary heat treatment includes normalizing and spheroidizing annealing; the normalizing temperature is 1030-1080 ℃ and the time is 1.5-2.6 h; the spheroidizing annealing comprises two stages; the temperature of the first stage is 900-980 ℃ and the time is 6-8 h; the temperature of the second stage is 700-780 ℃ and the time is 12-16 h.
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