CN110964883A - Heat treatment method for petroleum fracturing pump valve box - Google Patents
Heat treatment method for petroleum fracturing pump valve box Download PDFInfo
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- CN110964883A CN110964883A CN201911172408.6A CN201911172408A CN110964883A CN 110964883 A CN110964883 A CN 110964883A CN 201911172408 A CN201911172408 A CN 201911172408A CN 110964883 A CN110964883 A CN 110964883A
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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
- 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
- C21D1/18—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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a heat treatment method for a petroleum fracturing pump valve box, which comprises the following steps: step1, normalizing, heating the workpiece to 650 ℃, and keeping the temperature for 4-6 h; continuously heating to 900-920 ℃, and preserving heat for 8-10 h; discharging and air cooling to room temperature; step2, quenching, heating the workpiece to 650 ℃, and keeping the temperature for 4-6 h; continuously heating to 850-870 ℃, and preserving heat for 8-10 h; oil cooling, wherein the cooling temperature of the workpiece is less than 65.6 ℃ to obtain a martensite structure; step3, primary tempering, wherein the temperature in the furnace is less than 350 ℃; heating the workpiece to 350 ℃, and then preserving heat for 4-6 h; continuously heating to 560-600 ℃, and keeping the temperature for 13-15 h; cooling the discharged water to below 65.6 ℃; and step4, secondary tempering, setting the tempering temperature according to the hardness of the workpiece, controlling the temperature in the furnace to be within 350 ℃, discharging the workpiece, and naturally cooling the workpiece to room temperature to obtain the tempered sorbite structure. The invention obviously improves the rigidity, hardness, cutting performance, wear resistance, fatigue strength, toughness, corrosion resistance and comprehensive mechanical performance of the fracturing pump valve box, improves the service performance of the fracturing pump valve box, ensures the stability and reliability of the operation of the fracturing pump and prolongs the service life of the fracturing pump.
Description
Technical Field
The invention belongs to the technical field of manufacturing of oil exploitation equipment, and particularly relates to a heat treatment method for a petroleum fracturing pump valve box.
Background
At present, in the field of oil exploitation, the fracturing technology can effectively improve the exploitation amount of oil, and a fracturing pump is a key device in the fracturing exploitation process, and the performance, quality and reliability of the fracturing pump directly influence the quality and progress of the fracturing implementation process. The fracturing pump has extremely abominable service behavior, requires that the fracturing pump has higher pump pressure and bigger discharge capacity, can bear high pressure, cyclic load effect, and can carry the high pressure to take the medium of whetting, corroding, and then can reliably move under abominable operating mode to keep longer life.
The quality of the heat treatment method of the fracturing pump valve box has great influence on the corrosion resistance, the heat resistance, the mechanical property and the like of the fracturing pump valve box, and plays a decisive role in the processing performance of the fracturing pump valve box, so that the service condition and the service life of the fracturing pump are influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a heat treatment method for a petroleum fracturing pump valve box.
The invention solves the technical problems through the following technical means:
a heat treatment method for a petroleum fracturing pump valve box comprises the following steps:
step1. normalizing
Heating the workpiece to 650 ℃, and then preserving heat for 4-6 h; continuously heating to 900-920 ℃, and preserving heat for 8-10 h; discharging and naturally cooling or air cooling to room temperature;
step2. quenching
Heating the workpiece to 650 ℃, and then preserving heat for 4-6 h; continuously heating to 850-870 ℃, and preserving heat for 8-10 h; oil cooling is adopted, the temperature of the oil is controlled to be 40-80 ℃, the cooling temperature of the workpiece is less than 65.6 ℃, and a martensite structure is obtained; testing the hardness of the oil outlet groove and well recording;
step3. one-time tempering
Setting a tempering temperature, and controlling the temperature of the furnace entering into the furnace within 350 ℃; heating the workpiece to 350 ℃, and then preserving heat for 4-6 h; continuously heating to 560-600 ℃, and keeping the temperature for 13-15 h; cooling the discharged water to below 65.6 ℃, detecting the hardness, and recording;
step4. Secondary tempering
Setting tempering temperature according to the hardness of the workpiece, controlling the temperature of the furnace entering within 350 ℃, controlling the heat preservation time, discharging and naturally cooling to room temperature to obtain the tempered sorbite structure.
As an improvement of the above technical solution, the heat treatment method comprises the steps of:
step1. normalizing
Heating the workpiece to 650 ℃, and then preserving heat for 5 hours; continuously heating to 900-920 ℃, and keeping the temperature for 9 hours; discharging and naturally cooling or air cooling to room temperature;
step2. quenching
Heating the workpiece to 650 ℃, and then preserving heat for 5 hours; continuously heating to 850-870 ℃, and keeping the temperature for 9 h; oil cooling is adopted, the temperature of the oil is controlled to be 40-80 ℃, the cooling temperature of the workpiece is less than 65.6 ℃, and a martensite structure is obtained; testing the hardness of the oil outlet groove and well recording;
step3. one-time tempering
Setting a tempering temperature, and controlling the temperature of the furnace entering into the furnace within 350 ℃; heating the workpiece to 350 ℃, and then preserving heat for 5 hours; continuously heating to 560-600 ℃, and keeping the temperature for 14 h; cooling the discharged water to below 65.6 ℃, detecting the hardness, and recording;
step4. Secondary tempering
Setting tempering temperature according to the hardness of the workpiece, controlling the temperature of the furnace entering within 350 ℃, controlling the heat preservation time, discharging and naturally cooling to room temperature to obtain the tempered sorbite structure.
As an improvement of the technical scheme, in the step1, a heat treatment heating device is adopted; the heat treatment heating equipment meets the standard of the heat treatment heating equipment.
As an improvement of the technical scheme, in the step2, oil circulation is needed when oil is cooled, and the workpiece moves back and forth for 1.5 hours.
The invention has the beneficial effects that: the heat treatment method of the fracturing pump valve box is improved, so that the rigidity, hardness, cutting performance, wear resistance, fatigue strength, toughness, corrosion resistance and the like of the fracturing pump valve box are obviously improved, the physical performance, mechanical performance, residual stress, corrosion resistance and comprehensive mechanical performance of the fracturing pump valve box are improved, the service performance of the fracturing pump valve box is improved, the running stability and reliability of the fracturing pump are further ensured, and the service life of the fracturing pump is prolonged.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A heat treatment method for a petroleum fracturing pump valve box comprises the following steps:
step1. normalizing
Heating the workpiece to 650 ℃, and then preserving heat for 4-6 h; continuously heating to 900-920 ℃, and preserving heat for 8-10 h; discharging and naturally cooling or air cooling to room temperature; through normalizing and tissue thinning, the toughness, the cutting performance and the comprehensive mechanical property of the fracturing pump valve box are obviously improved, and a tissue close to a balanced state is obtained;
step2. quenching
Heating the workpiece to 650 ℃, and then preserving heat for 4-6 h, wherein the purpose of heat preservation is to make the internal temperature of the workpiece uniform and tend to be consistent for the whole quenching; continuously heating to 850-870 ℃, and preserving heat for 8-10 hours, wherein the heat preservation time finally depends on that a good quenching heating structure is obtained in the region requiring quenching; oil cooling is adopted, the temperature of the oil is controlled to be 40-80 ℃, the cooling temperature of the workpiece is less than 65.6 ℃, a microstructure mainly comprising martensite is obtained, and compared with other structures in steel, the martensite has the highest hardness, and has high strength and corrosion resistance; testing the hardness of the oil outlet groove and well recording; through quenching, the hardness, strength, wear resistance and corrosion resistance of the fracturing pump valve box are obviously improved;
step3. one-time tempering
Setting a tempering temperature, and controlling the temperature of the furnace entering into the furnace within 350 ℃; heating the workpiece to 350 ℃, and then preserving heat for 4-6 h; continuously heating to 560-600 ℃, and keeping the temperature for 13-15 h; cooling the discharged water to below 65.6 ℃, detecting the hardness, and recording;
step4. Secondary tempering
Setting tempering temperature according to the hardness of a workpiece, controlling the temperature of the furnace entering within 350 ℃, controlling the heat preservation time, discharging the workpiece from the furnace, naturally cooling the workpiece to room temperature to obtain a microstructure mainly containing uniform tempered sorbite, and tempering to eliminate the internal stress generated by quenching and reduce the brittleness of the fracturing pump valve box so as to obtain the expected mechanical property.
Tempered sorbite is formed by high-temperature tempering of martensite at 500-650 ℃, can be distinguished by magnifying the martensite by more than 500-600 times under an optical microscope, and is a composite structure of fine and uniform carbide (including cementite) spheres distributed in a ferrite matrix. The structure of the tempered sorbite is characterized in that the tempered sorbite is a complex phase structure consisting of equiaxed ferrite and fine-grained carbide, the trace of a martensite sheet disappears, and the appearance of a cementite is clearer. The carbide in the tempered sorbite has large dispersion degree and is spherical, so the tempered sorbite has better mechanical property than the sorbite.
The invention obtains a martensite structure through quenching, and then obtains a tempered sorbite structure by matching with tempering at different temperatures, so as to greatly improve the performances of rigidity, hardness, wear resistance, fatigue strength, toughness, corrosion resistance and the like of the fracturing pump valve box, and ensure that the fracturing pump valve box has very high toughness, enough strength and excellent comprehensive mechanical properties.
Examples
The heat treatment method comprises the following steps:
step1. normalizing
Heating the workpiece to 650 ℃, and then preserving heat for 5 hours; continuously heating to 900-920 ℃, and keeping the temperature for 9 hours; discharging and naturally cooling or air cooling to room temperature;
step2. quenching
Heating the workpiece to 650 ℃, and then preserving heat for 5 hours; continuously heating to 850-870 ℃, and keeping the temperature for 9 h; oil cooling is adopted, the temperature of the oil is controlled to be 40-80 ℃, the cooling temperature of the workpiece is less than 65.6 ℃, and a martensite structure is obtained; testing the hardness of the oil outlet groove and well recording;
step3. one-time tempering
Setting a tempering temperature, and controlling the temperature of the furnace entering into the furnace within 350 ℃; heating the workpiece to 350 ℃, and then preserving heat for 5 hours; continuously heating to 560-600 ℃, and keeping the temperature for 14 h; cooling the discharged water to below 65.6 ℃, detecting the hardness, and recording;
step4. Secondary tempering
Setting tempering temperature according to the hardness of the workpiece, controlling the temperature of the furnace entering within 350 ℃, controlling the heat preservation time, discharging and naturally cooling to room temperature to obtain the tempered sorbite structure.
In the step1, heat treatment heating equipment is adopted; the heat treatment heating equipment meets the standard of the heat treatment heating equipment so as to ensure the safety and the operational reliability of normalizing operation and improve the normalizing effect.
In the step2, oil circulation is needed during oil cooling, and the workpiece moves back and forth for 1.5 hours, so that the temperature of the workpiece is uniform and tends to be consistent, the oil cooling effect is ensured, and a microstructure mainly comprising martensite is obtained.
The heat treatment method of the fracturing pump valve box is improved, so that the rigidity, hardness, cutting performance, wear resistance, fatigue strength, toughness, corrosion resistance and the like of the fracturing pump valve box are obviously improved, the physical performance, mechanical performance, residual stress, corrosion resistance and comprehensive mechanical performance of the fracturing pump valve box are improved, the service performance of the fracturing pump valve box is improved, the running stability and reliability of the fracturing pump are further ensured, and the service life of the fracturing pump is prolonged.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A heat treatment method for a petroleum fracturing pump valve box is characterized by comprising the following steps:
step1. normalizing
Heating the workpiece to 650 ℃, and then preserving heat for 4-6 h; continuously heating to 900-920 ℃, and preserving heat for 8-10 h; discharging and naturally cooling or air cooling to room temperature;
step2. quenching
Heating the workpiece to 650 ℃, and then preserving heat for 4-6 h; continuously heating to 850-870 ℃, and preserving heat for 8-10 h; oil cooling is adopted, the temperature of the oil is controlled to be 40-80 ℃, the cooling temperature of the workpiece is less than 65.6 ℃, and a martensite structure is obtained; testing the hardness of the oil outlet groove and well recording;
step3. one-time tempering
Setting a tempering temperature, and controlling the temperature of the furnace entering into the furnace within 350 ℃; heating the workpiece to 350 ℃, and then preserving heat for 4-6 h; continuously heating to 560-600 ℃, and keeping the temperature for 13-15 h; cooling the discharged water to below 65.6 ℃, detecting the hardness, and recording;
step4. Secondary tempering
Setting tempering temperature according to the hardness of the workpiece, controlling the temperature of the furnace entering within 350 ℃, controlling the heat preservation time, discharging and naturally cooling to room temperature to obtain the tempered sorbite structure.
2. The heat treatment method for the petroleum fracturing pump valve box according to claim 1, wherein the heat treatment method comprises the following steps:
step1. normalizing
Heating the workpiece to 650 ℃, and then preserving heat for 5 hours; continuously heating to 900-920 ℃, and keeping the temperature for 9 hours; discharging and naturally cooling or air cooling to room temperature;
step2. quenching
Heating the workpiece to 650 ℃, and then preserving heat for 5 hours; continuously heating to 850-870 ℃, and keeping the temperature for 9 h; oil cooling is adopted, the temperature of the oil is controlled to be 40-80 ℃, the cooling temperature of the workpiece is less than 65.6 ℃, and a martensite structure is obtained; testing the hardness of the oil outlet groove and well recording;
step3. one-time tempering
Setting a tempering temperature, and controlling the temperature of the furnace entering into the furnace within 350 ℃; heating the workpiece to 350 ℃, and then preserving heat for 5 hours; continuously heating to 560-600 ℃, and keeping the temperature for 14 h; cooling the discharged water to below 65.6 ℃, detecting the hardness, and recording;
step4. Secondary tempering
Setting tempering temperature according to the hardness of the workpiece, controlling the temperature of the furnace entering within 350 ℃, controlling the heat preservation time, discharging and naturally cooling to room temperature to obtain the tempered sorbite structure.
3. The heat treatment method for the petroleum fracturing pump valve box according to claim 1 or 2, wherein: in the step1, heat treatment heating equipment is adopted; the heat treatment heating equipment meets the standard of the heat treatment heating equipment.
4. The method for heat-treating the valve box of the oil fracturing pump of claim 1 or 2, wherein in the step2, oil circulation is necessary when the oil is cold, and the workpiece moves back and forth for 1.5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911172408.6A CN110964883A (en) | 2019-11-26 | 2019-11-26 | Heat treatment method for petroleum fracturing pump valve box |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911172408.6A CN110964883A (en) | 2019-11-26 | 2019-11-26 | Heat treatment method for petroleum fracturing pump valve box |
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| CN110964883A true CN110964883A (en) | 2020-04-07 |
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| CN201911172408.6A Pending CN110964883A (en) | 2019-11-26 | 2019-11-26 | Heat treatment method for petroleum fracturing pump valve box |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112048607A (en) * | 2020-09-03 | 2020-12-08 | 山东大众机械制造股份有限公司 | Heat treatment process for valve body |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS613871A (en) * | 1984-06-16 | 1986-01-09 | Kawasaki Steel Corp | Very high tension cast steel having high toughness at very low temperature and its manufacture |
| CN101892362A (en) * | 2010-04-26 | 2010-11-24 | 晋西工业集团有限责任公司 | Hardening and tempering method in pump body manufacturing |
| CN106312448A (en) * | 2015-07-01 | 2017-01-11 | 上海添御石油设备科技有限公司 | Manufacturing technique for pressure pump valve housing of petroleum fracturing truck |
-
2019
- 2019-11-26 CN CN201911172408.6A patent/CN110964883A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS613871A (en) * | 1984-06-16 | 1986-01-09 | Kawasaki Steel Corp | Very high tension cast steel having high toughness at very low temperature and its manufacture |
| CN101892362A (en) * | 2010-04-26 | 2010-11-24 | 晋西工业集团有限责任公司 | Hardening and tempering method in pump body manufacturing |
| CN106312448A (en) * | 2015-07-01 | 2017-01-11 | 上海添御石油设备科技有限公司 | Manufacturing technique for pressure pump valve housing of petroleum fracturing truck |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112048607A (en) * | 2020-09-03 | 2020-12-08 | 山东大众机械制造股份有限公司 | Heat treatment process for valve body |
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Application publication date: 20200407 |