CN114603073A - Forging method for overcoming 4130 forging crack - Google Patents

Forging method for overcoming 4130 forging crack Download PDF

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Publication number
CN114603073A
CN114603073A CN202011420316.8A CN202011420316A CN114603073A CN 114603073 A CN114603073 A CN 114603073A CN 202011420316 A CN202011420316 A CN 202011420316A CN 114603073 A CN114603073 A CN 114603073A
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heating
furnace
temperature
forging
blank
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Inventor
陈昌华
孔德贵
陈海山
张利
张洪
宋雷钧
哈曜
陈洁
陈友坤
施虹屹
闵明
刘晓磊
龚洋道
汪海潮
张思瑞
陈新华
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Nanjing Develop Advanced Manufacturing Co ltd
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Nanjing Develop Advanced Manufacturing Co ltd
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    • 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
    • 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
    • B21J1/003—Selecting material
    • 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
    • B21J5/002—Hybrid process, e.g. forging following casting
    • 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
    • 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
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/04—Hardening by cooling below 0 degrees Celsius
    • 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
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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

Abstract

The invention discloses a forging method for overcoming cracks of 4130 forgings, which comprises the steps of preparation work, blank pretreatment, blank treatment, forging processing and forming, normalizing, austenitizing, deep cooling quenching, primary tempering, secondary tempering and the like, and the forgings are obtained. The invention strengthens the pretreatment link of the blank, and effectively removes the gaps and bubbles in the blank; in the links of temperature rise and temperature drop, the process of slow temperature rise and temperature drop is adopted, and cracks caused by temperature stress are avoided. And inert gas is introduced to enhance the surface pressure and avoid the appearance cracks generated by the change of the structural stress.

Description

Forging method for overcoming 4130 forging crack
Technical Field
The invention relates to a forging method for overcoming 4130 forging cracks, and belongs to the technical field of steel piece forging.
Background
The smelted 4130 steel phi 500 continuous casting round ingot is forged into 74 forged blank meters with different specifications by a 5t forging hammer. After normalizing and tempering the forging stock, respectively carrying out ultrasonic flaw detection and inspection, and finding that defect waves with penetrability and annular distribution exist in 11 forgings. The method comprises the steps that a company engineer immediately performs ultrasonic flaw detection inspection, dissects and samples, analyzes chemical components, mechanical properties and mechanical property fractures, performs series of inspection such as macroscopic structure inspection, microscopic structure inspection, forging metallographic inspection and non-metal inclusion inspection, and researches and analyses show that sample cracks are related to internal defects of forging blank and cooling speed, so that the traditional forging process of 4130 forgings needs to be changed to overcome the 4130 forging cracks, and the forging method for overcoming the 4130 forging cracks needs to be applied.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a forging method for overcoming cracks of 4130 forgings, which comprises the following specific technical scheme
Step one, preparation work: selecting 4130 blanks, selecting a heating furnace with corresponding specification, placing the heating furnace on a rotating mechanism, and preheating the heating furnace;
step two, blank pretreatment: putting the blank into a heating furnace, heating to 1200 DEG C
Taking out the blank by using a mechanical arm, and carrying out three times of upsetting, drawing out and rounding according to the cross direction; then cooling to room temperature from the terminal temperature;
punching blind holes on the forge piece, and performing primary processing to cast and form the forge piece;
step six, normalizing: putting the forge piece into a heating furnace with the temperature of 500 +/-10 ℃, heating the furnace to 900 +/-10 ℃ within five hours, preserving the temperature for more than 5.5 hours, and then taking out the forge piece and air-cooling to the room temperature;
step seven, austenitizing and deep cooling quenching: putting the forging into a heating furnace with the temperature of 400 +/-10 ℃, and preserving the heat for half an hour; heating the furnace to 900 +/-10 ℃ within three hours, preserving the temperature for at least three hours, and quenching and water cooling;
step eight, tempering for one time: putting the forge piece into a heating furnace with the temperature of 250 +/-10 ℃, heating the furnace to 800 +/-10 ℃ within three hours, preserving the temperature for at least four hours, and then taking out the forge piece and air-cooling to the room temperature;
step nine, secondary tempering: and (3) placing the forge piece into a heating furnace, starting the heating furnace to heat the furnace to 500 +/-10 ℃ within two hours, preserving the heat for at least two hours, and taking out the forge piece and air-cooling to room temperature.
Further, the 4130 blank comprises 0.11-0.15% of carbon, 0.30-0.60% of manganese, 0-0.5% of silicon, 0-0.015% of phosphorus, 0-0.010% of sulfur, 2.00-2.50% of chromium, 0-0.50% of nickel, 0.87-1.13% of molybdenum, 0-0.010% of vanadium, 0-0.35% of copper, 0-0.055% of aluminum, 0-0.001% of niobium, 0-0.0005% of boron, 0-0010% of titanium, 0-00.02% of tin, 0-0.003% of antimony, 0-0.002% of arsenic, 0-0.010% of lead, 0-0.010% of bismuth, 0-0.005% of calcium, 0-0.012% of sodium, 0-2% of hydrogen, 0-25% of oxygen, and the balance Fe.
Further, in the second step, the heating to 1200 ℃ comprises the steps of a, firstly heating to 500 +/-10 ℃ and preserving heat for at least 300 minutes, then heating to 950 +/-10 ℃ along with the furnace and preserving heat for at least 600 minutes, and finally heating to 1500 +/-10 ℃ along with the furnace and preserving heat for 300 minutes, wherein the heating speed is 50 +/-10 ℃ per hour.
Further, in the second step, the rotation speed of the heating furnace is kept at 30 rpm.
Further, in the third step, the blank is heated to 1200 ℃ and comprises the steps of firstly heating to 400 +/-10 ℃ and preserving heat for at least 300 minutes, then heating to 800 +/-10 ℃ along with the furnace and preserving heat for at least 600 minutes, and finally heating to 1200 +/-10 ℃ along with the furnace and preserving heat for 300 minutes, wherein the heating speed is 50 +/-10 ℃; when quenching, the steel plate is firstly cooled by water until the surface temperature is not higher than 400 ℃, and the water temperature at the beginning of quenching is not higher than 40 ℃.
Furthermore, the upsetting length-diameter ratio of the third upsetting in the third step is 1.5, and the upsetting length-diameter ratio in the fourth step is 2.
Has the advantages that: the invention strengthens the blank pretreatment link and effectively removes the gaps and bubbles in the blank; in the links of temperature rise and temperature drop, the process of slow temperature rise and temperature drop is adopted, and cracks caused by temperature stress are avoided. And inert gas is introduced to enhance the surface pressure and avoid the appearance cracks generated by the change of the structural stress.
Drawings
FIG. 1 is a cross-sectional view of a prior art forging;
FIG. 2 is a cross-sectional view of a forging obtained using the method of the present application.
Detailed Description
The present invention is further illustrated by the following figures and specific examples, which are to be understood as illustrative only and not as limiting the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which may occur to those skilled in the art upon reading the present specification.
Example 1 a forging method to overcome cracks in 4130 forgings comprising
Step one, preparation work: selecting 4130 blank, wherein the blank comprises 0.11-0.15% of carbon, 0.30-0.60% of manganese, 0-0.5% of silicon, 0-0.015% of phosphorus, 0-0.010% of sulfur, 2.00-2.50% of chromium, 0-0.50% of nickel, 0.87-1.13% of molybdenum, 0-0.010% of vanadium, 0-0.35% of copper, 0-0.055% of aluminum, 0-0.001% of niobium, 0-0.0005% of boron, 0-0010% of titanium, 0-00.02% of tin, 0-0.003% of antimony, 0-0.002% of arsenic, 0-0.010% of lead, 0-0.010% of bismuth, 0-0.005% of calcium, 0-0.012% of sodium, 0-2% of hydrogen, 0-25% of oxygen, and the balance Fe. And selecting a heating furnace with corresponding specification, placing the heating furnace on the rotating mechanism, and preheating the heating furnace to 300 ℃.
Step two, blank pretreatment: putting the blank into a heating furnace, heating to 1200 ℃ to enable the blank to be in a molten state;
the heating to 1200 was as follows: firstly heating to 500 +/-10 ℃ and preserving heat for at least 300 minutes, then heating to 950 +/-10 ℃ along with the furnace and preserving heat for at least 600 minutes, and finally heating to 1200 +/-10 ℃ along with the furnace and preserving heat for 300 minutes, wherein the heating speed is 50 +/-10 ℃ per hour. At this time, the billet is in a molten state. The rotating mechanism is started to rotate the heating furnace for 30 minutes, and the rotating speed of the heating furnace is kept at 30 rpm. Internal bubbles and gaps are extruded under the action of centrifugal force, so that internal cracks are reduced; the furnace stops rotating and the billet is cooled to room temperature. When the cooling time is kept at 10 ℃, the cooling speed is 100 degrees/hour.
Step three, blank reprocessing: heating the blank to 1200 ℃, comprising the steps of firstly heating to 400 +/-10 ℃ and preserving heat for at least 300 minutes, then heating to 800 +/-10 ℃ along with a furnace and preserving heat for at least 600 minutes, and finally heating to 1200 +/-10 ℃ along with the furnace and preserving heat for 300 minutes, wherein the heating speed is 50 +/-10 ℃/hour; then quenching is carried out, water is firstly cooled to the surface temperature of not higher than 400 ℃ during quenching, and the water temperature at the beginning of quenching is not higher than 38 ℃.
And (3) putting the blank into a heating furnace for heating for the third time to 1200 ℃, wherein the heating process is the same as that of the second heating. Taking out the blank by using a mechanical arm, and carrying out three times of upsetting, drawing and rounding according to the cross direction; then cooling to room temperature from the final temperature.
And fifthly, punching blind holes on the forged piece, and performing primary processing to cast and form the forged piece.
Step six, normalizing: putting the forge piece into a heating furnace with the temperature of 500 +/-10 ℃, heating the furnace to 900 +/-10 ℃ within five hours, preserving the temperature for more than 5.5 hours, and then taking out the forge piece and air-cooling to the room temperature;
step seven, austenitizing and deep cooling quenching: putting the forging into a heating furnace with the temperature of 400 +/-10 ℃, and preserving the heat for half an hour; heating the furnace to 900 +/-10 ℃ within three hours, preserving the temperature for at least three hours, and quenching and water cooling;
step eight, tempering for one time: putting the forge piece into a heating furnace with the temperature of 250 +/-10 ℃, heating the furnace to 800 +/-10 ℃ within three hours, preserving the temperature for at least four hours, and then taking out the forge piece and air-cooling to the room temperature;
step nine, secondary tempering: and (3) placing the forge piece into a heating furnace, starting the heating furnace to heat the furnace to 500 +/-10 ℃ within two hours, preserving the heat for at least two hours, and taking out the forge piece and air-cooling to room temperature.
Wherein the length-diameter ratio of the upsetting of the three times of upsetting in the third step is 1.5, and the length-diameter ratio of the upsetting in the fourth step is 2.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (6)

1. A forging method for overcoming 4130 forging crack is characterized in that: comprises that
Step one, preparation work: selecting 4130 blanks, selecting a heating furnace with corresponding specification, placing the heating furnace on a rotating mechanism, and preheating the heating furnace;
step two, blank pretreatment: putting the blank into a heating furnace, heating to 1200 DEG C
Taking out the blank by using a mechanical arm, and carrying out three times of upsetting, drawing out and rounding according to the cross direction; then cooling to room temperature from the terminal temperature;
punching blind holes on the forge piece, and performing primary processing to cast and form the forge piece;
step six, normalizing: putting the forge piece into a heating furnace with the temperature of 500 +/-10 ℃, heating the furnace to 900 +/-10 ℃ within five hours, preserving the temperature for more than 5.5 hours, and then taking out the forge piece and air-cooling to the room temperature;
step seven, austenitizing and deep cooling quenching: putting the forging into a heating furnace with the temperature of 400 +/-10 ℃, and preserving the heat for half an hour; heating the furnace to 900 +/-10 ℃ within three hours, preserving the temperature for at least three hours, and quenching and water cooling;
step eight, tempering for one time: putting the forge piece into a heating furnace with the temperature of 250 +/-10 ℃, heating the furnace to 800 +/-10 ℃ within three hours, preserving the temperature for at least four hours, and then taking out the forge piece and air-cooling to the room temperature;
step nine, secondary tempering: and (3) placing the forge piece into a heating furnace, starting the heating furnace to heat the furnace to 500 +/-10 ℃ within two hours, preserving the heat for at least two hours, and taking out the forge piece and air-cooling to room temperature.
2. The forging method of overcoming 4130 forging cracks as set forth in claim 1, wherein: the 4130 blank comprises 0.11-0.15% of carbon, 0.30-0.60% of manganese, 0-0.5% of silicon, 0-0.015% of phosphorus, 0-0.010% of sulfur, 2.00-2.50% of chromium, 0-0.50% of nickel, 0.87-1.13% of molybdenum, 0-0.010% of vanadium, 0-0.35% of copper, 0-0.055% of aluminum, 0-0.001% of niobium, 0-0.0005% of boron, 0-0010% of titanium, 0-00.02% of tin, 0-0.003% of antimony, 0-0.002% of arsenic, 0-0.010% of lead, 0-0.010% of bismuth, 0-0.005% of calcium, 0-0.012% of sodium, 0-2% of hydrogen, 0-25% of oxygen, and the balance of Fe.
3. The forging method of overcoming 4130 forging cracks as set forth in claim 1, wherein: in the second step, the heating to 1200 ℃ comprises the steps of firstly heating to 500 +/-10 ℃ and preserving heat for at least 300 minutes, then heating to 950 +/-10 ℃ along with the furnace and preserving heat for at least 600 minutes, and finally heating to 1200 +/-10 ℃ along with the furnace and preserving heat for 300 minutes, wherein the heating speed is 50 +/-10 ℃ per hour.
4. The forging method of overcoming 4130 forging cracks as set forth in claim 1, wherein: in the second step, the rotating speed of the heating furnace is kept at 30 r/min.
5. The forging method of overcoming 4130 forging cracks as set forth in claim 1, wherein: in the third step, the blank is heated to 1200 ℃ and comprises the steps of heating to 400 +/-10 ℃ and preserving heat for at least 300 minutes, heating to 800 +/-10 ℃ along with the furnace and preserving heat for at least 600 minutes, and finally heating to 1200 +/-10 ℃ along with the furnace and preserving heat for 300 minutes, wherein the heating speed is 50 +/-10 ℃ per hour; when quenching, the steel plate is firstly cooled by water until the surface temperature is not higher than 400 ℃, and the water temperature at the beginning of quenching is not higher than 50 ℃.
6. The forging method of overcoming 4130 forging cracks as set forth in claim 1, wherein: the upsetting length-diameter ratio of the three times of upsetting in the third step is 1.5, and the upsetting length-diameter ratio in the fourth step is 2.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106119723A (en) * 2016-06-24 2016-11-16 张家港海锅重型锻件有限公司 A kind of production method of deep-sea oil extracting ship 4130 coupling forging raw material
CN108754308A (en) * 2018-05-25 2018-11-06 张家港海锅新能源装备股份有限公司 The production method of tubing head high strength steel forging raw material in a kind of deep-sea oil production equipment
CN111716083A (en) * 2020-07-02 2020-09-29 南京迪威尔高端制造股份有限公司 Method for overcoming explosion defect of 4140 steel tubing hanger body

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106119723A (en) * 2016-06-24 2016-11-16 张家港海锅重型锻件有限公司 A kind of production method of deep-sea oil extracting ship 4130 coupling forging raw material
CN108754308A (en) * 2018-05-25 2018-11-06 张家港海锅新能源装备股份有限公司 The production method of tubing head high strength steel forging raw material in a kind of deep-sea oil production equipment
CN111716083A (en) * 2020-07-02 2020-09-29 南京迪威尔高端制造股份有限公司 Method for overcoming explosion defect of 4140 steel tubing hanger body

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