CN111074161A - Petroleum fracturing pump valve box and machining method thereof - Google Patents

Petroleum fracturing pump valve box and machining method thereof Download PDF

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Publication number
CN111074161A
CN111074161A CN201911173037.3A CN201911173037A CN111074161A CN 111074161 A CN111074161 A CN 111074161A CN 201911173037 A CN201911173037 A CN 201911173037A CN 111074161 A CN111074161 A CN 111074161A
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Prior art keywords
valve box
fracturing pump
less
equal
workpiece
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CN201911173037.3A
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Chinese (zh)
Inventor
李敦发
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Anhui Tianyu Petroleum Equipment Manufacturing Co ltd
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Anhui Tianyu Petroleum Equipment Manufacturing Co ltd
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Priority to CN201911173037.3A priority Critical patent/CN111074161A/en
Publication of CN111074161A publication Critical patent/CN111074161A/en
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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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • 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
    • 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
    • C22C38/18—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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections

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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)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention discloses a petroleum fracturing pump valve box, wherein a blank of the valve box is stainless steel, and the stainless steel comprises the following elements in percentage by mass: less than or equal to 0.07 wt% of C, less than or equal to 1.00 wt% of Mn, less than or equal to 1.00 wt% of Si, 15.5-20 wt% of Cr, 3.0-6.0 wt% of Ni, less than or equal to 0.035 wt% of P, less than or equal to 0.03 wt% of S, 3.0-5.0 wt% of Cu, 0.3-1.0 wt% of Mo, 0.15-0.45 wt% of Nb + Ta, and the balance of Fe. A processing method of a petroleum fracturing pump valve box comprises the following steps: step1, polishing; step2, charging; step3, normalizing, and transferring to a tempering furnace after normalizing; step4, quenching, namely directly performing oil quenching; step5, primary tempering; step6, secondary tempering; and (5) testing. According to the invention, through the selection of the valve box material and the improvement of the processing method of the valve box, the capability of bearing high pressure and alternating load impact force of the valve box is improved, and meanwhile, the strength, hardness, toughness, wear resistance and corrosion resistance of the valve box are obviously improved, so that the application range and operation reliability of the fracturing pump and the valve box are further improved, and the service lives of the fracturing pump and the valve box are prolonged.

Description

Petroleum fracturing pump valve box and machining method thereof
Technical Field
The invention belongs to the technical field of manufacturing of oil exploitation equipment, and particularly relates to an oil fracturing pump valve box and a processing method thereof.
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.
Because the use operating mode of fracturing pump is very abominable, require that the fracturing pump has higher pump pressure and bigger discharge capacity, can bear high pressure, cyclic load effect, and can carry the medium that the high pressure area was worn out, is corroded, and then can reliably operate under abominable operating mode, and keep longer life. However, the ability of the prior art frac pump valve box to withstand high pressure and alternating load impact forces, as well as its corrosion resistance, limits the operating conditions of the frac pump and severely affects the service life of the frac pump and valve box.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a petroleum fracturing pump valve box and a processing method thereof.
The invention solves the technical problems through the following technical means:
a blank of a valve box of an oil fracturing pump is stainless steel, and the stainless steel comprises the following elements in percentage by mass: less than or equal to 0.07 wt% of C, less than or equal to 1.00 wt% of Mn, less than or equal to 1.00 wt% of Si, 15.5-20 wt% of Cr, 3.0-6.0 wt% of Ni, less than or equal to 0.035 wt% of P, less than or equal to 0.03 wt% of S, 3.0-5.0 wt% of Cu, 0.3-1.0 wt% of Mo, 0.15-0.45 wt% of Nb + Ta, and the balance of Fe.
As an improvement of the technical scheme, the stainless steel comprises the following elements in percentage by mass: 0.01 to 0.04 wt% of C, 0.8 to 1.00 wt% of Mn, 0.3 to 0.8 wt% of Si, 17 to 20 wt% of Cr, 5.0 to 6.0 wt% of Ni, less than or equal to 0.02 wt% of P, less than or equal to 0.01 wt% of S, 3.0 to 3.5 wt% of Cu, 0.5 to 1.0 wt% of Mo, 0.15 to 0.30 wt% of Nb and Ta, and the balance of Fe.
As an improvement of the technical scheme, in the stainless steel, the mass percent of the element Ta is not more than 0.10 wt%.
A processing method of a petroleum fracturing pump valve box comprises the following steps:
step1. polishing
Polishing the valve box, wherein all surfaces are not allowed to have tool receiving marks;
step2. charging
A heat treatment heating device is adopted, a workpiece is charged in an effective heating area, and a cushion block is arranged between the workpiece and a furnace plate of a trolley furnace;
step3. normalizing
Controlling the temperature and time, discharging, naturally cooling or air cooling, normalizing and transferring to a tempering furnace;
step4. quenching
Direct oil quenching, namely adopting rapid quenching oil, controlling the temperature of the oil to be 40-80 ℃, circulating the oil during oil quenching, moving the workpiece back and forth for 1.5 hours, cooling the workpiece to be less than 65.6 ℃, and detecting the hardness of the oil outlet tank and recording the hardness;
step5. one-time tempering
Setting tempering temperature, controlling the temperature of the furnace entering into the furnace within 350 ℃, controlling the heat preservation time, cooling the discharged water to below 65.6 ℃, detecting the hardness, and recording;
step6. 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;
step7. test
Cleaning surface oxides, checking the surface hardness of the valve box, and performing quality inspection by a self-inspection qualified intersection.
As an improvement of the above technical solution, the step1 specifically comprises the following steps: the inner hole intersecting line is ground into round corners R8 with the minimum R6.35, and the outer shape acute angle is ground into R3.
As an improvement of the above technical solution, in step2, the heat treatment heating equipment meets the standard of the heat treatment heating equipment.
As an improvement of the above technical solution, the step3 specifically comprises the following steps: 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; and discharging and naturally cooling or air cooling to room temperature.
As an improvement of the above technical solution, the step5 specifically comprises the following steps: 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; and (4) discharging and cooling the water to below 65.6 ℃.
The invention has the beneficial effects that: according to the invention, through the selection of the valve box material and the improvement of the processing method of the valve box, the capability of bearing high pressure and alternating load impact force of the valve box is improved, and meanwhile, the strength, hardness, toughness, wear resistance and corrosion resistance of the valve box are obviously improved, so that the application range and operation reliability of the fracturing pump and the valve box are further improved, and the service lives of the fracturing pump and the valve box are 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.
Example 1
A blank of a valve box of an oil fracturing pump is stainless steel, and the stainless steel comprises the following elements in percentage by mass: 0.01 wt% of C, 1.00 wt% of Mn, 0.3 wt% of Si, 17 wt% of Cr, 6.0 wt% of Ni, 0 wt% of P, 0.01wt% of S, 3.0 wt% of Cu, 1.0 wt% of Mo, 0.15 wt% of Nb + Ta, and the balance of Fe.
Example 2
A blank of a valve box of an oil fracturing pump is stainless steel, and the stainless steel comprises the following elements in percentage by mass: 0.04 wt% of C, 0.8 wt% of Mn, 0.8 wt% of Si, 20 wt% of Cr, 5.0 wt% of Ni, 0.02 wt% of P, 0.005wt% of S, 3.5 wt% of Cu, 0.5 wt% of Mo, 0.30 wt% of Nb + Ta, and the balance of Fe.
Example 3
A blank of a valve box of an oil fracturing pump is stainless steel, and the stainless steel comprises the following elements in percentage by mass: 0.025 wt% of C, 0.9 wt% of Mn, 0.55 wt% of Si, 18.5 wt% of Cr, 5.5 wt% of Ni, 0.01wt% of P0.01wt% of S, 3.25 wt% of Cu, 0.75 wt% of Mo, 0.22 wt% of Nb + Ta, and the balance of Fe.
Example 4
A blank of a valve box of an oil fracturing pump is stainless steel, and the stainless steel comprises the following elements in percentage by mass: 0.07 wt% of C, 0.2 wt% of Mn, 1.00 wt% of Si, 15.5 wt% of Cr, 3.0 wt% of Ni, 0.035 wt% of P0.03 wt% of S, 5.0 wt% of Cu, 0.3 wt% of Mo, 0.45 wt% of Nb and Ta, and the balance of Fe.
In the stainless steel, the mass percent of the element Ta is not more than 0.10 wt%.
Elements in the stainless steel: the strength, hardness and wear resistance of the valve box can be improved; mn is a good deoxidizer and desulfurizer, can improve the wear resistance, strength, hardness, toughness and quenching property of the valve box and improve the hot working performance of the valve box; cr can improve the corrosion resistance, the wear resistance, the high-temperature oxidation resistance, the toughness, the weldability and the chloride stress corrosion resistance of the valve box; ni can improve the hardenability, toughness, weldability and corrosion resistance of the valve box; s can improve the cutting processing performance of the valve box; cu can improve the machining performance of the valve box and the corrosion resistance to acid; mo has the characteristics of good high-temperature strength, high hardness, high density, strong corrosion resistance, small thermal expansion coefficient, good electric conductivity, heat conductivity and the like, and can remarkably improve the hardness, the wear resistance and the stress corrosion resistance of the valve box; nb can improve the oxidation resistance of the valve box at high temperature and improve the welding performance of the valve box; ta has excellent chemical properties, extremely high corrosion resistance, good plasticity and easy processing, and can improve the corrosion resistance and the machining performance of the valve box; nb and Ta form carbide, so that the strength, compression resistance, wear resistance and corrosion resistance of the valve box can be obviously improved, and the service life of the valve box is prolonged.
In embodiments 1 to 4, the method for processing the valve box according to the present invention includes the following steps:
step1. polishing
Polishing the valve box, polishing a fillet R8 at the intersection line of an inner hole, polishing a minimum R6.35, polishing an acute shape angle R3, and not allowing tool receiving marks on all surfaces;
step2. charging
Adopting heat treatment heating equipment, wherein the heat treatment heating equipment meets the standard of the heat treatment heating equipment, a workpiece is charged in an effective heating area, and a cushion block is arranged between the workpiece and a furnace plate of a trolley furnace;
step3. normalizing
Controlling the temperature and time, discharging, naturally cooling or air cooling, normalizing and transferring to a tempering furnace;
step4. quenching
Direct oil quenching, namely adopting rapid quenching oil, controlling the temperature of the oil to be 40-80 ℃, circulating the oil during oil quenching, moving the workpiece back and forth for 1.5 hours, cooling the workpiece to be less than 65.6 ℃, and detecting the hardness of the oil outlet tank and recording the hardness;
step5. one-time tempering
Setting tempering temperature, controlling the temperature of the furnace entering into the furnace within 350 ℃, controlling the heat preservation time, cooling the discharged water to below 65.6 ℃, detecting the hardness, and recording;
step6. 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;
step7. test
Cleaning surface oxides, checking the surface hardness of the valve box, and performing quality inspection by a self-inspection qualified intersection.
The method specifically comprises the following steps: 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; and discharging and naturally cooling or air cooling to room temperature.
The method specifically comprises the following steps: 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; and (4) discharging and cooling the water to below 65.6 ℃.
According to the invention, through the selection of the valve box material and the improvement of the processing method of the valve box, the capability of bearing high pressure and alternating load impact force of the valve box is improved, and meanwhile, the strength, hardness, toughness, wear resistance and corrosion resistance of the valve box are obviously improved, so that the application range and operation reliability of the fracturing pump and the valve box are further improved, and the service lives of the fracturing pump and the valve box are 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 (8)

1. The petroleum fracturing pump valve box is characterized in that a blank of the valve box is stainless steel, and the stainless steel comprises the following elements in percentage by mass: less than or equal to 0.07 wt% of C, less than or equal to 1.00 wt% of Mn, less than or equal to 1.00 wt% of Si, 15.5-20 wt% of Cr, 3.0-6.0 wt% of Ni, less than or equal to 0.035 wt% of P, less than or equal to 0.03 wt% of S, 3.0-5.0 wt% of Cu, 0.3-1.0 wt% of Mo, 0.15-0.45 wt% of Nb + Ta, and the balance of Fe.
2. The petroleum fracturing pump valve box of claim 1, wherein the stainless steel comprises the following elements in mass percent: 0.01 to 0.04 wt% of C, 0.8 to 1.00 wt% of Mn, 0.3 to 0.8 wt% of Si, 17 to 20 wt% of Cr, 5.0 to 6.0 wt% of Ni, less than or equal to 0.02 wt% of P, less than or equal to 0.01 wt% of S, 3.0 to 3.5 wt% of Cu, 0.5 to 1.0 wt% of Mo, 0.15 to 0.30 wt% of Nb and Ta, and the balance of Fe.
3. The petroleum fracturing pump valve box of claim 1 or 2, wherein: in the stainless steel, the mass percent of the element Ta is not more than 0.10 wt%.
4. The method for processing the petroleum fracturing pump valve box, which comprises the step of claim 1, is characterized by comprising the following steps:
step1. polishing
Polishing the valve box, wherein all surfaces are not allowed to have tool receiving marks;
step2. charging
A heat treatment heating device is adopted, a workpiece is charged in an effective heating area, and a cushion block is arranged between the workpiece and a furnace plate of a trolley furnace;
step3. normalizing
Controlling the temperature and time, discharging, naturally cooling or air cooling, normalizing and transferring to a tempering furnace;
step4. quenching
Direct oil quenching, namely adopting rapid quenching oil, controlling the temperature of the oil to be 40-80 ℃, circulating the oil during oil quenching, moving the workpiece back and forth for 1.5 hours, cooling the workpiece to be less than 65.6 ℃, and detecting the hardness of the oil outlet tank and recording the hardness;
step5. one-time tempering
Setting tempering temperature, controlling the temperature of the furnace entering into the furnace within 350 ℃, controlling the heat preservation time, cooling the discharged water to below 65.6 ℃, detecting the hardness, and recording;
step6. 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;
step7. test
Cleaning surface oxides, checking the surface hardness of the valve box, and performing quality inspection by a self-inspection qualified intersection.
5. The method for processing the petroleum fracturing pump valve box according to claim 4, wherein the Step1. comprises the following steps: the inner hole intersecting line is ground into round corners R8 with the minimum R6.35, and the outer shape acute angle is ground into R3.
6. The method for processing the oil fracturing pump valve box according to claim 4 or 5, wherein the method comprises the following steps: and in the step2, the heat treatment heating equipment meets the standard of the heat treatment heating equipment.
7. The method for processing the valve box of the petroleum fracturing pump of claim 6, wherein the Step3. comprises the following steps: 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; and discharging and naturally cooling or air cooling to room temperature.
8. The method for processing the valve box of the petroleum fracturing pump of claim 6, wherein the Step5. comprises the following steps: 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; and (4) discharging and cooling the water to below 65.6 ℃.
CN201911173037.3A 2019-11-26 2019-11-26 Petroleum fracturing pump valve box and machining method thereof Pending CN111074161A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911173037.3A CN111074161A (en) 2019-11-26 2019-11-26 Petroleum fracturing pump valve box and machining method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911173037.3A CN111074161A (en) 2019-11-26 2019-11-26 Petroleum fracturing pump valve box and machining method thereof

Publications (1)

Publication Number Publication Date
CN111074161A true CN111074161A (en) 2020-04-28

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1597404A2 (en) * 2003-02-07 2005-11-23 Advanced Steel Technology LLC Fine-grained martensitic stainless steel and method thereof
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
CN106319379A (en) * 2015-07-01 2017-01-11 上海添御石油设备科技有限公司 Stainless steel material for pressure pump valve housing of petroleum fracturing truck

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1597404A2 (en) * 2003-02-07 2005-11-23 Advanced Steel Technology LLC Fine-grained martensitic stainless steel and method thereof
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
CN106319379A (en) * 2015-07-01 2017-01-11 上海添御石油设备科技有限公司 Stainless steel material for pressure pump valve housing of petroleum fracturing truck

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Application publication date: 20200428