CN113355596A - Round forging tempering treatment process for alloy steel - Google Patents

Round forging tempering treatment process for alloy steel Download PDF

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Publication number
CN113355596A
CN113355596A CN202110561221.6A CN202110561221A CN113355596A CN 113355596 A CN113355596 A CN 113355596A CN 202110561221 A CN202110561221 A CN 202110561221A CN 113355596 A CN113355596 A CN 113355596A
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forging
alloy steel
quenching
temperature
round
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CN113355596B (en
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郑凯哲
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Jiangsu Zhuhong Heavy Industry Co ltd
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Jiangsu Zhuhong Heavy Industry 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
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K29/00—Arrangements for heating or cooling during processing
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • 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
    • C21D1/26—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
    • 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
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • 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
    • C22C38/04—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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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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  • 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)

Abstract

The invention discloses a quenching and tempering treatment process for an alloy steel forging circle, which is characterized by comprising the following chemical components in percentage by mass: 0.40 to 0.45% of C, 0.20 to 0.35% of Si, 0.6 to 0.8% of Mn, 0.01% or less of P, 0.01% or less of S, 0.4 to 0.6% of Cr, 0.6 to 0.9% of Ni, 0.1 to 0.3% of Mo, 0.01 to 0.03% of Hf-Fe, 0.01 to 0.03% of Zr-Fe, 0.02 to 0.04% of Be, 0.01 to 0.03% of Gd, and the balance of Fe; the preparation method comprises the steps of S1, open fire heating treatment before forging; step S2, forging; and step S3, heat treatment. The alloy steel forging circle quenching and tempering treatment process provided by the invention is simple, convenient to operate and control and low in energy consumption; the alloy steel round forged surface processed by the quenching and tempering treatment process is smooth and free of defects, the finished product qualification rate is high, the mechanical property is better, and the comprehensive performance is more excellent.

Description

Round forging tempering treatment process for alloy steel
Technical Field
The invention relates to the technical field of alloy steel forging circle processing and manufacturing, in particular to a quenching and tempering treatment process for an alloy steel forging circle.
Background
Alloy steel, especially alloy steel with good comprehensive mechanical properties, is one of the raw materials urgently needed in equipment manufacturing production, and is widely applied to climbing gears of large-scale port cranes, large-scale offshore floating cranes and offshore oil drilling platforms, mud valve blocks for oil exploitation equipment, various heavy-duty transmission shafts and the like. The development of alloy steel with excellent comprehensive performance is a necessary way for meeting the requirements of different conditions and improving the use safety.
The quenching and tempering is an essential process in the preparation process of alloy steel, the process can adjust the performance and the material quality of steel to a great extent, and the quenched and tempered steel has good strength, plasticity and toughness and good comprehensive mechanical properties, so the quenching and tempering process is widely applied to the heat treatment of the steel. Alloy steel forging is one of common alloy steel materials, and quenching and tempering are very necessary for improving the comprehensive performance of the alloy steel forging. However, the existing alloy steel forging round quenching and tempering treatment process has the defects of complex process, long production period and much energy consumption, and the surface defect of the manufactured forging round forging piece is easy to crack, so that the material is scrapped or lost.
Chinese patent document CN 109385510B discloses a Cr-Ni-Mo crack sensitive steel large-diameter forging round black skin quenching and tempering process, belongs to the technical field of metal heat treatment, and aims to solve the problems that quenching and tempering treatment is carried out on Cr-Ni-Mo crack sensitive steel, so that cracking is easy to occur, and products are scrapped, and the key points of the technical scheme are that the quenching and tempering process comprises the following process steps: heat treatment before forging; forging: forging the steel ingot treated in the first step by using hot-section equipment until the steel ingot is forged into a cylindrical shape; removing oxide skin on the surface of the steel ingot by using oxide skin cleaning equipment during forging to obtain a forged piece; slow cooling after forging: loading the forged piece into a slow cooling pit for slow cooling until the temperature of the forged piece is less than or equal to 150 ℃; quenching: quenching the forged piece treated in the third step by using quenching oil, wherein the temperature of the quenching oil is 60-80 ℃, and the quenching time is 10-30 min; tempering: and heating the forged piece subjected to quenching treatment in the fourth step to 650 ℃, preserving heat for 2.5-3.0 hours, and then naturally cooling. The method has the advantages of high yield, short treatment period and low energy consumption. However, quenching oil is adopted for quenching, and the quenching oil is aged after long-term use, needs to be replaced periodically and has high cost; oil smoke is generated to pollute the air during quenching, which is not beneficial to the health of environment-friendly hafnium operators; easy to catch fire and has larger potential safety hazard.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a round forged alloy steel quenching and tempering treatment process which is simple, convenient to operate and control and low in energy consumption; the alloy steel round forged surface processed by the quenching and tempering treatment process is smooth and free of defects, the finished product qualification rate is high, the mechanical property is better, and the comprehensive performance is more excellent.
In order to achieve the purpose, the invention adopts the technical scheme that: the quenching and tempering treatment process of the alloy steel forging circle is characterized in that the alloy steel forging circle comprises the following chemical components in percentage by mass: 0.40 to 0.45% of C, 0.20 to 0.35% of Si, 0.6 to 0.8% of Mn, 0.01% or less of P, 0.01% or less of S, 0.4 to 0.6% of Cr, 0.6 to 0.9% of Ni, 0.1 to 0.3% of Mo, 0.01 to 0.03% of Hf-Fe, 0.01 to 0.03% of Zr-Fe, 0.02 to 0.04% of Be, 0.01 to 0.03% of Gd, and the balance of Fe.
Preferably, the Hf-Fe is an Hf-Fe alloy intermediate, wherein the mass ratio of Hf to Fe is (2-4): 1.
Preferably, the Zr-Fe is Zr and Fe alloy intermediate, wherein the mass ratio of Zr to Fe is (3-5): 2.
The round forging thermal refining process for the alloy steel is characterized by comprising the following steps of:
step S1, open flame heating before forging: adding the steel ingot into the furnace by open fire according to five sections, heating for one section at the temperature of 350 ℃ and 400 ℃ for 2-3 minutes; heating the second stage at the temperature of 450 ℃ and 550 ℃ for 1-2 minutes; heating for three sections at 600-700 ℃ for 2-4 minutes; heating for four sections at the temperature of 800 ℃ and 900 ℃ for 1-3 minutes; heating for five sections at the temperature of 1000 ℃ and 1200 ℃ for 1-2 hours;
step S2, forging: forging by adopting a hydraulic air hammer or a quick forging hydraulic machine;
step S3, heat treatment: and normalizing, quenching and annealing the manufactured alloy steel forging circle in sequence.
Preferably, the forging/pressing ratio of the forging in the step S2 is 6-10, the soaking temperature is 1150-1180, the temperature rising speed is less than or equal to 100 ℃/h, the soaking time is 3-5 h, the open forging temperature is 1100-1140 ℃, the finish forging temperature is 900-980 ℃, and the upsetting time is more than or equal to 3 times.
Preferably, the normalizing temperature of 550-650 ℃ in the step S3, and the heat preservation time is 20-30 minutes.
Preferably, the quenching in step S3 is step isothermal quenching, specifically: firstly, the temperature is preserved for 30-50min at 850-900 ℃, then the mixture is immediately transferred into a 550-600 ℃ furnace for heat preservation for 30-40min, and then the mixture is cooled to the room temperature at the average cooling speed of 35-40 ℃/s.
Preferably, the quenching in step S3 is either water quenching or air quenching.
Preferably, the annealing temperature in step S3 is 520-570 ℃, and the annealing time is 1-2 hours.
The invention also aims to provide an alloy steel forging circle manufactured by the alloy steel forging circle quenching and tempering process.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention provides a round forging tempering treatment process for alloy steel, which is simple, convenient to operate and control and low in energy consumption; the alloy steel round forged surface processed by the quenching and tempering treatment process is smooth and free of defects, the finished product qualification rate is high, the mechanical property is better, and the comprehensive performance is more excellent.
Detailed Description
The following detailed description of preferred embodiments of the invention will be made.
The quenching and tempering treatment process of the alloy steel forging circle is characterized in that the alloy steel forging circle comprises the following chemical components in percentage by mass: 0.40 to 0.45% of C, 0.20 to 0.35% of Si, 0.6 to 0.8% of Mn, 0.01% or less of P, 0.01% or less of S, 0.4 to 0.6% of Cr, 0.6 to 0.9% of Ni, 0.1 to 0.3% of Mo, 0.01 to 0.03% of Hf-Fe, 0.01 to 0.03% of Zr-Fe, 0.02 to 0.04% of Be, 0.01 to 0.03% of Gd, and the balance of Fe.
Preferably, the Hf-Fe is an Hf-Fe alloy intermediate, wherein the mass ratio of Hf to Fe is (2-4): 1.
Preferably, the Zr-Fe is Zr and Fe alloy intermediate, wherein the mass ratio of Zr to Fe is (3-5): 2.
The round forging thermal refining process for the alloy steel is characterized by comprising the following steps of:
step S1, open flame heating before forging: adding the steel ingot into the furnace by open fire according to five sections, heating for one section at the temperature of 350 ℃ and 400 ℃ for 2-3 minutes; heating the second stage at the temperature of 450 ℃ and 550 ℃ for 1-2 minutes; heating for three sections at 600-700 ℃ for 2-4 minutes; heating for four sections at the temperature of 800 ℃ and 900 ℃ for 1-3 minutes; heating for five sections at the temperature of 1000 ℃ and 1200 ℃ for 1-2 hours;
step S2, forging: forging by adopting a hydraulic air hammer or a quick forging hydraulic machine;
step S3, heat treatment: and normalizing, quenching and annealing the manufactured alloy steel forging circle in sequence.
Preferably, the forging/pressing ratio of the forging in the step S2 is 6-10, the soaking temperature is 1150-1180, the temperature rising speed is less than or equal to 100 ℃/h, the soaking time is 3-5 h, the open forging temperature is 1100-1140 ℃, the finish forging temperature is 900-980 ℃, and the upsetting time is more than or equal to 3 times.
Preferably, the normalizing temperature of 550-650 ℃ in the step S3, and the heat preservation time is 20-30 minutes.
Preferably, the quenching in step S3 is step isothermal quenching, specifically: firstly, the temperature is preserved for 30-50min at 850-900 ℃, then the mixture is immediately transferred into a 550-600 ℃ furnace for heat preservation for 30-40min, and then the mixture is cooled to the room temperature at the average cooling speed of 35-40 ℃/s.
Preferably, the quenching in step S3 is either water quenching or air quenching.
Preferably, the annealing temperature in step S3 is 520-570 ℃, and the annealing time is 1-2 hours.
The invention also aims to provide an alloy steel forging circle manufactured by the alloy steel forging circle quenching and tempering process.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention provides a round forging tempering treatment process for alloy steel, which is simple, convenient to operate and control and low in energy consumption; the alloy steel round forged surface processed by the quenching and tempering treatment process is smooth and free of defects, the finished product qualification rate is high, the mechanical property is better, and the comprehensive performance is more excellent.
The invention will be further described with reference to specific examples, but the scope of protection of the invention is not limited thereto:
example 1
The embodiment provides a quenching and tempering treatment process for an alloy steel forging circle, which is characterized in that the alloy steel forging circle comprises the following chemical components in percentage by mass: 0.40% of C, 0.20% of Si, 0.6% of Mn, 0.01% or less of P, 0.01% or less of S, 0.4% of Cr, 0.6% of Ni, 0.1% of Mo, 0.01% of Hf-Fe, 0.01% of Zr-Fe, 0.01% of Be, 0.02% of Gd, and the balance of Fe.
The Hf-Fe is an alloy intermediate of Hf and Fe, wherein the mass ratio of Hf to Fe is 2: 1; the Zr-Fe is an alloy intermediate of Zr and Fe, wherein the mass ratio of Zr to Fe is 3: 2.
The round forging thermal refining process for the alloy steel is characterized by comprising the following steps of:
step S1, open flame heating before forging: adding the steel ingot into the steel ingot by open fire according to five sections, heating for one section at 350 ℃ for 2 minutes; heating the second stage at 450 deg.c for 1 min; heating for three sections at 600 ℃ for 2 minutes; heating for 1 minute at 800 ℃ in four stages; heating for five sections at 1000 ℃ for 1 hour;
step S2, forging: forging by adopting a hydraulic air hammer or a quick forging hydraulic machine;
step S3, heat treatment: and normalizing, quenching and annealing the manufactured alloy steel forging circle in sequence.
The forging ratio of the forging in the step S2 is 6, the soaking temperature is 1150, the temperature rise speed is less than or equal to 100 ℃/h, the soaking time is 3 h, the open forging temperature is 1100 ℃, the finish forging temperature is 900 ℃, and the upsetting time is more than or equal to 3 times.
In the step S3, the normalizing temperature is 550 ℃, and the heat preservation time is 20 minutes.
The quenching in the step S3 is step isothermal quenching, which specifically comprises: firstly, preserving heat at 850 ℃ for 30min, then immediately transferring into a furnace at 550 ℃ for 30min, and then cooling to room temperature at the average cooling speed of 35 ℃/s.
In step S3, the quenching is water quenching.
The annealing temperature in step S3 was 520 ℃, and the annealing time was 1 hour.
The alloy steel forging circle is manufactured by the alloy steel forging circle quenching and tempering treatment process.
Example 2
The embodiment provides a quenching and tempering treatment process for an alloy steel forging circle, which is basically the same as that in embodiment 1, except that the alloy steel forging circle comprises the following chemical components in percentage by mass: 0.42% of C, 0.25% of Si, 0.65% of Mn, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 0.45% of Cr, 0.7% of Ni, 0.15% of Mo, 0.015% of Hf-Fe, 0.015% of Zr-Fe, 0.025% of Be, 0.015% of Gd and the balance of iron; the quenching in the step S3 is step isothermal quenching, which specifically comprises: the temperature is firstly preserved for 35min at 860 ℃, then immediately transferred into a furnace at 570 ℃ for preserving the temperature for 32min, and then cooled to the room temperature at the average cooling speed of 36 ℃/s.
Example 3
The embodiment provides a quenching and tempering treatment process for an alloy steel forging circle, which is basically the same as that in embodiment 1, except that the alloy steel forging circle comprises the following chemical components in percentage by mass: 0.43% of C, 0.28% of Si, 0.7% of Mn, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 0.5% of Cr, 0.75% of Ni, 0.2% of Mo, 0.02% of Hf-Fe, 0.02% of Zr-Fe, 0.03% of Be, 0.02% of Gd and the balance of iron; the quenching in the step S3 is step isothermal quenching, which specifically comprises: the temperature is firstly preserved for 40min at 870 ℃, then immediately transferred into a furnace at 570 ℃ for 35min, and then cooled to room temperature at the average cooling speed of 38 ℃/s.
Example 4
The embodiment provides a quenching and tempering treatment process for an alloy steel forging circle, which is basically the same as that in embodiment 1, except that the alloy steel forging circle comprises the following chemical components in percentage by mass: 0.44% of C, 0.33% of Si, 0.75% of Mn, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 0.55% of Cr, 0.85% of Ni, 0.25% of Mo, 0.025% of Hf-Fe, 0.025% of Zr-Fe, 0.035% of Be, 0.025% of Gd, and the balance of Fe; the quenching in the step S3 is step isothermal quenching, which specifically comprises: the temperature is firstly preserved for 46min at 890 ℃, then immediately transferred into a 590 ℃ furnace for preserving the temperature for 38min, and then cooled to the room temperature at the average cooling speed of 39 ℃/s.
Example 5
The embodiment provides a quenching and tempering treatment process for an alloy steel forging circle, which is basically the same as that in embodiment 1, except that the alloy steel forging circle comprises the following chemical components in percentage by mass: 0.45% of C, 0.35% of Si, 0.8% of Mn, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 0.6% of Cr, 0.9% of Ni, 0.3% of Mo, 0.03% of Hf-Fe, 0.03% of Zr-Fe, 0.04% of Be, 0.03% of Gd and the balance of iron; the quenching in the step S3 is step isothermal quenching, which specifically comprises: firstly, the temperature is preserved for 50min at 900 ℃, then the temperature is immediately preserved for 40min in a 600 ℃ furnace, and then the temperature is cooled to the room temperature at the average cooling speed of 40 ℃/s.
Comparative example 1
This example provides a round forged temper process for alloy steel, which is substantially the same as example 1, except that Hf-Fe and Be were not added; the heat treatment does not include an annealing treatment.
Comparative example 2
The embodiment provides a round forging thermal refining process for alloy steel, which has the same formula and preparation method as those of embodiment 1, and is different from the embodiment in that Zr-Fe and Gd are not added; in step S3, the quenching is replaced by heating to 850 ℃, and then cooling to room temperature at an average cooling rate of 33 ℃/sec.
In order to further illustrate the beneficial technical effects of the products of the embodiments of the present application, the alloy steel forged round produced by each embodiment is subjected to related performance tests, and the test results are shown in table 1.
TABLE 1
Item Tensile strength (MPa) Yield strength (MPa)
Example 1 1020 816
Example 2 1032 822
Example 3 1040 830
Example 4 1046 836
Example 5 1051 841
Comparative example 1 776 756
Comparative example 2 793 767
As can be seen from the data in Table 1, the products in the examples of the present application have higher mechanical properties than the comparative examples, which are the result of the combined action of the alloy formulation and the thermal refining.
The above-mentioned embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.

Claims (10)

1. The quenching and tempering treatment process of the alloy steel forging circle is characterized in that the alloy steel forging circle comprises the following chemical components in percentage by mass: 0.40 to 0.45% of C, 0.20 to 0.35% of Si, 0.6 to 0.8% of Mn, 0.01% or less of P, 0.01% or less of S, 0.4 to 0.6% of Cr, 0.6 to 0.9% of Ni, 0.1 to 0.3% of Mo, 0.01 to 0.03% of Hf-Fe, 0.01 to 0.03% of Zr-Fe, 0.02 to 0.04% of Be, 0.01 to 0.03% of Gd, and the balance of Fe.
2. The round forging thermal refining process of alloy steel according to claim 1, wherein the Hf-Fe is an intermediate Hf-Fe alloy, and the mass ratio of Hf to Fe is (2-4): 1.
3. The round forging thermal refining process of alloy steel according to claim 1, wherein Zr-Fe is a Zr-Fe alloy intermediate, wherein the mass ratio of Zr to Fe is (3-5): 2.
4. The round forged thermal refining process for alloy steel according to claim 1, comprising:
step S1, open flame heating before forging: adding the steel ingot into the furnace by open fire according to five sections, heating for one section at the temperature of 350 ℃ and 400 ℃ for 2-3 minutes; heating the second stage at the temperature of 450 ℃ and 550 ℃ for 1-2 minutes; heating for three sections at 600-700 ℃ for 2-4 minutes; heating for four sections at the temperature of 800 ℃ and 900 ℃ for 1-3 minutes; heating for five sections at the temperature of 1000 ℃ and 1200 ℃ for 1-2 hours;
step S2, forging: forging by adopting a hydraulic air hammer or a quick forging hydraulic machine;
step S3, heat treatment: and normalizing, quenching and annealing the manufactured alloy steel forging circle in sequence.
5. The round forging tempering process of alloy steel according to claim 4, wherein the forging ratio of the forging in step S2 is 6-10, the soaking temperature is 1150-1180, the temperature rise rate is less than or equal to 100 ℃/h, the soaking time is 3-5 h, the open forging temperature is 1100-1140 ℃, the finish forging temperature is 900-980 ℃, and the upsetting time is more than or equal to 3 times.
6. The round forging tempering process of alloy steel as set forth in claim 4, wherein said normalizing temperature of 550-650 ℃ in step S3, and the holding time is 20-30 minutes.
7. The round forging thermal refining process of alloy steel according to claim 4, wherein the quenching in step S3 is step isothermal quenching, specifically: firstly, the temperature is preserved for 30-50min at 850-900 ℃, then the mixture is immediately transferred into a 550-600 ℃ furnace for heat preservation for 30-40min, and then the mixture is cooled to the room temperature at the average cooling speed of 35-40 ℃/s.
8. The round forging quenching and tempering process of alloy steel according to claim 4, wherein said quenching in step S3 is any one of water quenching and air quenching.
9. The round forged thermal refining process of alloy steel as claimed in claim 4, wherein the annealing temperature in step S3 is 520-570 ℃, and the annealing time is 1-2 hours.
10. An alloy steel forging circle manufactured by the alloy steel forging circle quenching and tempering process according to any one of claims 1 to 9.
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Publication number Priority date Publication date Assignee Title
CN113957219A (en) * 2021-09-22 2022-01-21 南京钢铁集团冶金铸造有限公司 Preparation method of low-temperature impact resistant carbon manganese steel S355J2G3 forged circle

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CN102094150A (en) * 2011-03-09 2011-06-15 莱芜钢铁集团有限公司 Ultra-thick high temperature-resistant steel for pressure vessel and preparation method thereof
CN103958714A (en) * 2011-11-21 2014-07-30 新日铁住金株式会社 Rolled steel bar for hot forging
JP2016216810A (en) * 2015-05-26 2016-12-22 新日鐵住金株式会社 Low carbon steel sheet excellent in machinability and friction resistance after hardening and tempering and manufacturing method therefor
CN109385510A (en) * 2018-10-20 2019-02-26 江苏铸鸿锻造有限公司 A kind of Cr-Ni-Mo crack-sensitivity steel major diameter forging circle casting skin hardening and tempering process

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US4244754A (en) * 1975-07-05 1981-01-13 The Foundation: The Research Institute Of Electric And Magnetic Alloys Process for producing high damping capacity alloy and product
CN102094150A (en) * 2011-03-09 2011-06-15 莱芜钢铁集团有限公司 Ultra-thick high temperature-resistant steel for pressure vessel and preparation method thereof
CN103958714A (en) * 2011-11-21 2014-07-30 新日铁住金株式会社 Rolled steel bar for hot forging
JP2016216810A (en) * 2015-05-26 2016-12-22 新日鐵住金株式会社 Low carbon steel sheet excellent in machinability and friction resistance after hardening and tempering and manufacturing method therefor
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113957219A (en) * 2021-09-22 2022-01-21 南京钢铁集团冶金铸造有限公司 Preparation method of low-temperature impact resistant carbon manganese steel S355J2G3 forged circle

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