CN110863144A - High-strength steel for oil and gas exploitation fracturing pump and manufacturing method thereof - Google Patents
High-strength steel for oil and gas exploitation fracturing pump and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses high-strength steel for a fracturing pump for oil and gas exploitation and a manufacturing method thereof, and belongs to the technical field of preparation of new steel materials. Comprises the following components: 0.28 to 0.35 percent of carbon, 0.20 to 0.40 percent of silicon, 0.50 to 0.90 percent of manganese, 0.01 to 0.05 percent of vanadium, 1.20 to 1.45 percent of chromium, 0.35 to 0.65 percent of molybdenum, 2.90 to 3.30 percent of nickel, less than or equal to 0.20 percent of copper, 0.010 to 0.050 percent of aluminum, less than or equal to 0.010 percent of phosphorus, less than or equal to 0.010 percent of sulfur, 0.03 to 0.06 percent of rare earth elements, and the balance of iron and inevitable elements. The invention has the beneficial effects that: the invention provides a new high-strength steel material for a fracturing pump for oil and gas exploitation and a manufacturing method thereof, which effectively ensure that the new steel material 30CrNi3MoVRE for the fracturing pump for oil and gas exploitation has excellent comprehensive performance by reasonably controlling the proportion of various alloy elements, key process control points and a scientific heat treatment system, and ensure that the material has higher compactness, higher cleanliness, more stable performance and longer service life.
Description
Technical Field
The invention belongs to the technical field of preparation of new steel materials, and particularly relates to high-strength steel for a fracturing pump for oil and gas exploitation and a manufacturing method thereof.
Background
The steel for the oil and gas exploitation fracturing pump is a key steel material applied to manufacturing a body and a valve body of the fracturing pump. Shale gas is known to be unconventional natural gas with great development potential and abundant world storage capacity. China is the country with the largest shale gas storage capacity, but is limited by the external natural conditions of natural gas storage, and shale gas exploitation in China is still in the primary stage. With the continuous advance of unconventional oil and gas production, the fracturing pump is widely researched and developed as one of important production devices, particularly as a fracturing pump with ultrahigh power.
In the exploitation of oil fields and shale gas, the number of high-pressure wells and deep wells is gradually increased, the pressure requirement on a fracturing pump is also increased, and the working pressure of a valve box is continuously increased under the harsh conditions, so that the problem that the valve box and other parts of the fracturing pump fail frequently occurs. The service life of the fracturing pump is reduced, about 350 hours, and the efficiency of the fracturing process is seriously influenced. The steel for the fracturing pump is required to have sufficient strength and toughness, and the requirements on various metallurgical defects which can become crack sources of the valve box of the fracturing pump are very strict.
Therefore, how to design and develop a new steel material for the oil and gas exploitation fracturing pump with higher performance stability and longer service life is a technical problem to be solved by the invention.
Disclosure of Invention
In order to solve the problems, the invention provides high-strength steel for a fracturing pump for oil and gas exploitation and a manufacturing method thereof, wherein the steel is 30CrNi3 MoVRE. Through reasonable control of the proportion of various alloy elements, key process control points and a scientific heat treatment system, the novel steel material 30CrNi3MoVRE for the oil and gas exploitation fracturing pump is effectively ensured to have excellent comprehensive performance, and the material is ensured to have higher compactness, higher cleanliness, more stable performance and longer service life.
The technical scheme of the invention is as follows:
the high-strength steel for the oil and gas exploitation fracturing pump comprises the following components: 0.28 to 0.35 percent of carbon, 0.20 to 0.40 percent of silicon, 0.50 to 0.90 percent of manganese, 0.01 to 0.05 percent of vanadium, 1.20 to 1.45 percent of chromium, 0.35 to 0.65 percent of molybdenum, 2.90 to 3.30 percent of nickel, less than or equal to 0.20 percent of copper, 0.010 to 0.050 percent of aluminum, less than or equal to 0.010 percent of phosphorus, less than or equal to 0.010 percent of sulfur, 0.03 to 0.06 percent of rare earth elements, and the balance of iron and inevitable elements.
The specific functions of the rare earth elements are as follows:
(1) deep purification, control of the weakening source: the main points are as follows: can deeply reduce the content of oxygen and sulfur, and reduce the harmful effects of low-melting-point elements such as phosphorus, sulfur, hydrogen, arsenic, antimony, bismuth, lead, tin and the likeThe application is as follows. The segregation of sulfur and rare earth elements on the grain boundary of high-speed steel is studied by Auger spectroscopy and an ion probe. The rare earth element reduces P segregation of crystal boundary, and eliminates Fe formation3P weakens the harmful effect of the grain boundary and improves the state of the grain boundary, thereby strengthening the grain boundary, hindering intergranular fracture and increasing the transgranular fracture fraction.
(2) Modification: the rare earth not only can purify molten steel, but also can refine the solidification structure of steel, and change the property, form and distribution of inclusions, thereby improving various performances of the steel. The 'form control' of the inclusions is one of the main functions of the rare earth in the steel, and the rare earth can control the forms of the sulfur and oxygen inclusions, as shown in figures 1 to 3, and obviously improves transverse toughness, high-temperature plasticity, welding performance, fatigue performance, atmospheric corrosion resistance and the like. The thermal expansion coefficient of the rare earth inclusions is similar to that of steel, as shown in fig. 4, and thus, it is possible to prevent a large additional stress from being generated around the inclusions when the steel material is hot-worked and cooled, which is advantageous in improving the fatigue strength of the steel.
(3) Coagulation "tissue control": the size of the secondary dendrite spacing will affect microsegregation, inclusion and porosity, thus affecting the mechanical properties. The rare earth forms a compound with a higher melting point in steel, and is precipitated before the molten steel is solidified, and the compound is distributed in the molten steel in a fine particle form and serves as a heterogeneous nucleation center, so that the supercooling degree of the molten steel crystal is reduced, the solidification structure of the steel can be refined, the segregation is reduced, and the solidification structure control is realized.
(4) Micro-alloying action: rare earth has purification and obvious modification effects in steel. The cleanliness of steel is continuously improved, and the microalloy strengthening effect of rare earth elements is increasingly prominent. The microalloying of the rare earth comprises solid solution strengthening of trace rare earth elements, interaction of the rare earth elements and other solute elements or compounds, size, shape and distribution of existing states (atoms, inclusions or compounds) of rare earth atoms, particularly segregation in grain boundaries, influence of the rare earth on the steel surface and matrix structure and the like.
The vanadium is added into the invention, and the function is as follows: the microstructure and the performance of steel are influenced mainly by forming carbon and nitride, the carbon and nitride is easier to melt into steel than Al element, vanadium can play a role in refining crystal grains, the strength, the toughness and the wear resistance of the steel are obviously improved, and when the content of vanadium in the steel is less than or equal to 0.15%, the generated compound mainly exists in the form of vanadium nitride, so that the crystal grains can be refined, and the strength and the toughness are improved. However, when the vanadium content in the steel is more than 0.15%, along with the increase of vanadium carbide compounds, the impact toughness of the material tends to be reduced, and the cost is considered, and the vanadium content V of the finished product design: 0.01 to 0.05 percent.
Preferably, the general looseness of the steel for the high-strength oil and gas exploitation fracturing pump is less than or equal to 2.0 level, the central looseness is less than or equal to 2.0 level, ingot type segregation is less than or equal to 2.0 level, point segregation is not more than 1.0 level, the grain size is not less than 6 level, ultrasonic flaw detection is carried out according to GB/T6402-2008 standard, and the qualified level is 4 level (the length or the diameter of each intensive point discontinuous equivalent flat-bottom hole is less than or equal to 2mm, and the diameter of each single point discontinuous equivalent flat-bottom hole is less than or equal to 3 mm.
Preferably, the class A inclusion of the steel for the high-strength oil and gas exploitation fracturing pump is controlled to be less than or equal to 1.0 level, the class B inclusion is controlled to be less than or equal to 1.5 level, the class C inclusion is controlled to be less than or equal to 1.0 level, the class D inclusion is controlled to be less than or equal to 1.0 level, and the class Ds inclusion is controlled to be less than or equal to 1.0 level.
Preferably, the high-strength steel for oil and gas production fracturing pumps has T [ O ]]The content is less than or equal to 20 multiplied by 10-6H content is controlled to be less than or equal to 2 multiplied by 10-6。
Preferably, the yield strength Rel of the steel for the high-strength oil and gas exploitation fracturing pump is more than or equal to 900MPa, the tensile strength Rm is more than or equal to 1060MPa, the elongation A is more than or equal to 18%, the reduction of area Z is more than or equal to 45%, and the impact energy KV at the temperature of-20 ℃ is more than or equal to KV2≥40J。
The invention also aims to provide a manufacturing method of the steel for the high-strength oil and gas exploitation fracturing pump, which comprises the following steps:
(1) the electric furnace smelting adopts high molten iron proportion, the molten iron ratio is more than or equal to 60 percent, the phosphorus content of tapping is controlled to be less than or equal to 0.08 percent, the carbon content of tapping is controlled to be more than or equal to 0.20 percent, the tapping temperature is controlled to be 1620-1670 ℃, pure aluminum blocks are added according to the calculated amount of 0.040-0.090 percent of the first target aluminum in LF furnace steel, and a low-nitrogen recarburizing agent is adopted;
(2) the refining slag system adopts a high-alkalinity refining slag system, and the slag has binary alkalinity R (CaO/SiO)2)＝4～7，A(CaO/Al2O3) Adding 7-12 kg/t of refined lime, adding 300 kg/furnace of high-alkalinity premelted refining slag, adding furnace fluorite according to the actual condition of the refining slag to adjust the slag, using 20-50 kg of aluminum particles in batches according to the slag changing condition, performing diffusion deoxidation by using more than or equal to 80kg of carbon powder, maintaining the atmosphere by using SiC, adding more than or equal to 2kg/t, and feeding 0.035% of aluminum wires (considering residue); controlling VD vacuum time to be more than or equal to 20min, and controlling soft blowing time to be 20-30 min;
(3) the rare earth addition time is determined after VD vacuum treatment, and the rare earth is added into a steel ladle in a throwing mode according to the reaction characteristics of rare earth alloy, wherein the addition amount is 25-30 kg per furnace;
(4) the heating time of the forging heating furnace is controlled for 10-12 h, the core of the steel ingot is heated to a specified temperature, the diffusion of segregation components is promoted, the soaking temperature is controlled to 1230 ℃, the coarse grains are prevented, and the initial forging temperature is as follows: 1180-1220 ℃, and finish forging temperature: 800-850 ℃; the forging ratio is more than or equal to 4;
(5) after sampling, carrying out integral heat treatment according to an equivalent test bar, carrying out sampling detection according to the quenching temperature of 860-880 ℃, the heat preservation time of 3h, the tempering temperature of 610-650 ℃, air cooling to room temperature, and ensuring that the yield strength Rel is more than or equal to 900MPa, Rm is more than or equal to 1060MPa, the elongation A is more than or equal to 17%, the reduction of area Z is more than or equal to 45%, and the impact power KV at the temperature of-20 ℃ is more than KV2≥40J。
Particularly, the adding time and the adding amount of the deoxidizer aluminum in the step (1) are controlled to ensure that the deoxidizer aluminum reaches 0.040 to 0.090 percent when being refined to the first station.
Preferably, the low nitrogen carburant in the step (1) comprises the following components: fixing carbon: 98.5%, moisture: 0.5%, ash content: 0.8% max, volatiles: 0.7% max (%), undersize particle size: 10 (%) and the manufacturer is from the firm city to the metallurgy refractory company Limited, and the model is ZCYJ-LNC.
Preferably, the initial forging temperature in the step (4) is 1180-1220 ℃, a lean operation method of cold-warm forging is adopted in the forging process, so that the surface temperature is reduced, and then in the subsequent forging process, good internal deformation and no crack on the surface can be ensured, so that the internal density of the product, namely the flaw detection index reaches the GB/T6402-2008 standard for ultrasonic flaw detection inspection, the qualified level is 4, the length or the diameter of the intensive point-shaped discontinuous equivalent flat-bottom hole is less than or equal to 2mm, and the diameter of the single point-shaped discontinuous equivalent flat-bottom hole is less than or equal to 3 mm.
The invention has the beneficial effects that:
(1) the invention provides a new high-strength steel material (30 CrNi3MoVRE) for a fracturing pump for oil and gas exploitation and a manufacturing method thereof, and the new high-strength steel material 30CrNi3MoVRE for the fracturing pump for oil and gas exploitation is effectively ensured to have excellent comprehensive performance by reasonably controlling the proportion of various alloy elements, key process control points and a scientific heat treatment system, and is ensured to have higher compactness, higher cleanliness, more stable performance and longer service life.
(2) The invention adds rare earth elements, which can obviously improve the performance of steel. The rare earth element has strong chemical activity due to a unique electronic shell structure, and the energy valence state of the 4f shell structure is variable and large in atom size, so that the rare earth element is a strong purifying agent for steel and an effective modifier for clean steel inclusions, and is a strong inhibitor for effectively controlling a weakening source in the steel and reducing the energy state of a local area and local weakening of the steel.
(3) The vanadium is added to influence the organization structure and the performance of the steel mainly by forming carbon and nitride, is easier to melt into the steel than Al element, can play a role in refining grains, and obviously improves the strength, the toughness and the wear resistance of the steel.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a graph showing the relationship between the rare earth content and the oxygen content in steel;
FIG. 2 is a graph showing the relationship between the oxygen content in steel and the average size of inclusions;
FIG. 3 is a graph showing the relationship between the size of rare earth and inclusions in steel;
figure 4 shows a stress diagram for oxide inclusions.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. 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
The high-strength steel for the oil gas exploitation fracturing pump is 30CrNi3MoVRE in steel grade and comprises the following components: 0.31% of carbon, 0.30% of silicon, 0.80% of manganese, 0.03% of vanadium, 1.33% of chromium, 0.50% of molybdenum, 3.15% of nickel, 0.20% or less of copper, 0.020% of aluminum, 0.008% of phosphorus, 0.002% of sulfur, 0.045% of RE and the balance of iron and inevitable elements.
Based on the above component design, the measured values of component control in the implementation process are shown in table 1:
TABLE 1 internal control Range of chemical composition
In the process of manufacturing the high-strength steel 30CrNi3MoVRE for the oil and gas exploitation fracturing pump, the process capability control index Cpk of the actual control component is more than or equal to 1.70, the A + level is achieved, the design requirement is met, and the specific test components are shown in Table 2.
TABLE 2 actual chemical composition control values
| Furnace number | C | Si | Mn | P | S | Cr | Mo | V | Al | Cu | Ni | RE |
| 1 | 0.31 | 0.30 | 0.80 | 0.008 | 0.001 | 1.33 | 0.50 | 0.03 | 0.020 | 0.010 | 3.15 | 0.042 |
| 2 | 0.31 | 0.29 | 0.79 | 0.009 | 0.002 | 1.32 | 0.48 | 0.03 | 0.021 | 0.012 | 3.14 | 0.045 |
| 3 | 0.30 | 0.31 | 0.81 | 0.005 | 0.003 | 1.31 | 0.49 | 0.03 | 0.023 | 0.009 | 3.16 | 0.047 |
| 4 | 0.31 | 0.28 | 0.80 | 0.006 | 0.002 | 1.32 | 0.51 | 0.03 | 0.018 | 0.010 | 3.12 | 0.040 |
| 5 | 0.32 | 0.29 | 0.81 | 0.009 | 0.001 | 1.32 | 0.52 | 0.02 | 0.021 | 0.010 | 3.13 | 0.047 |
| 6 | 0.31 | 0.30 | 0.79 | 0.008 | 0.002 | 1.31 | 0.49 | 0.03 | 0.020 | 0.008 | 3.14 | 0.046 |
| 7 | 0.31 | 0.30 | 0.80 | 0.008 | 0.004 | 1.32 | 0.51 | 0.02 | 0.020 | 0.010 | 3.12 | 0.045 |
| 8 | 0.32 | 0.31 | 0.79 | 0.004 | 0.003 | 1.32 | 0.49 | 0.02 | 0.022 | 0.009 | 3.13 | 0.046 |
| 9 | 0.31 | 0.29 | 0.81 | 0.009 | 0.002 | 1.33 | 0.51 | 0.02 | 0.020 | 0.008 | 3.17 | 0.045 |
| 10 | 0.31 | 0.30 | 0.81 | 0.007 | 0.002 | 1.34 | 0.50 | 0.02 | 0.019 | 0.010 | 3.16 | 0.047 |
Example 2
According to the feeding amount of the embodiment 1, the manufacturing method of the steel for the high-strength oil and gas exploitation fracturing pump, which is 30CrNi3MoVRE in the steel mark, is provided in the embodiment:
(1) the electric furnace smelting adopts high molten iron proportion, the molten iron proportion reaches 65%, the phosphorus content of tapping is controlled to be 0.07%, the carbon content of tapping is controlled to be 0.22%, the tapping temperature is controlled to be 1640 ℃, 180kg of pure aluminum blocks are added to the LF furnace steel according to the calculated amount of 0.075% of the first target aluminum, and all low-nitrogen recarburizers are adopted;
(2) the refining slag system adopts a high-alkalinity refining slag system, and the slag has binary alkalinity R (CaO/SiO)2)＝5，A(CaO/Al2O3) Adding 9.5kg/t of refined lime, 300 kg/furnace of high-alkalinity premelted refining slag, adding furnace fluorite according to the actual condition of the refining slag to adjust the slag, adopting 35kg of aluminum particles and 95kg of carbon powder to perform diffusion deoxidation (the aluminum particles are required to be used in batches according to the slag change condition), keeping the atmosphere by using SiC, adding 2.1kg/t in total, and feeding 0.035% of aluminum wires (considering the residue); controlling VD vacuum time to be 25min, and controlling soft blowing time to be 25 min;
(3) the rare earth is added after VD vacuum treatment, and is added into a steel ladle in a throwing mode according to the reaction characteristics of the rare earth alloy, wherein the adding amount is 28 kg/furnace.
(4) The heating time of the forging heating furnace is controlled for 11.5 hours, the core part of the steel ingot is heated to the specified temperature, the diffusion of segregation components is promoted, the soaking temperature is controlled to 1230 ℃, the coarse crystal grains are prevented, and the initial forging temperature is as follows: 1200 ℃ and finish forging temperature: 830 ℃; the forging ratio is 4.6; as the optimized temperature control in the forging process, particularly the temperature control in the forging process is controlled, in the forging process, a lean operation method of cold warm forging is adopted to reduce the surface temperature, and then in the subsequent forging process, good internal deformation can be ensured without generating cracks on the surface, so that the internal density of the product, namely the flaw detection index reaches the GB/T6402-2008 standard to carry out ultrasonic flaw detection inspection, and the qualified level is 4 (the length or the diameter of an equivalent flat hole with intensive point discontinuity is less than or equal to 2mm, and the diameter of an equivalent flat hole with single point discontinuity is less than or equal to 3 mm).
(5) After sampling, carrying out integral heat treatment according to an equivalent test bar, carrying out sampling detection according to the quenching temperature of 870 ℃, the heat preservation time of 3h and the tempering temperature of 630 ℃, air-cooling to room temperature, and ensuring that the yield strength Rel is 980MPa, the Rm is 1150MPa, the elongation A is 21%, the reduction of area Z is 59%, and the impact work KV at-20 ℃ is2＝58J。
Example 3
Based on the preparation process of the embodiment 2, the high-alkalinity refining slag system is selected in the step (2), and the binary alkalinity R (CaO/SiO) of the slag is controlled2)＝4.2，A(CaO/Al2O3) Adding 7.5kg/t of refined lime, 300 kg/furnace of high-alkalinity premelted refining slag, adding fluorite 50 according to the actual condition of the refining slag to adjust the slag, using 24kg of aluminum particles and 85kg of carbon powder in batches to perform diffusion deoxidation, using SiC to maintain the atmosphere, adding the silicon carbide particles according to 2.0kg/t, and feeding an aluminum wire according to 0.035% (considering the residue); controlling VD vacuum time for 22min and soft blowing time for 21 min.
By examining the cleanliness of the product obtained in example 3, the following results were obtained: the class A inclusion, the class B inclusion, the class C inclusion, the class D inclusion and the class Ds inclusion of the steel for the high-strength oil and gas exploitation fracturing pump are controlled to be 1.0 grade, 0.5 grade and 0.5 grade respectively. The final product has mechanical performance, yield strength Rel of 1020MPa and Rm of 1164MPa, and ductilityThe elongation A is 23 percent, the reduction of area Z is 61 percent, and the impact energy KV at the temperature of minus 20 DEG C2＝64J。
Example 4
Based on the preparation process of the embodiment 2, the high-alkalinity refining slag system is selected in the step (2), and the binary alkalinity R (CaO/SiO) of the slag is controlled2)＝6.5，A(CaO/Al2O3) Adding 11kg/t of refined lime, 300 kg/furnace of high-alkalinity premelted refining slag, adding fluorite 40 according to the actual condition of the refining slag to adjust the slag, using 45kg of aluminum particles and 120kg of carbon powder in batches to perform diffusion deoxidation, using SiC to maintain the atmosphere, adding 2.5kg/t of the aluminum particles, and feeding 0.035% of aluminum wires (considering the residue); controlling VD vacuum time to be 28min and controlling soft blowing time to be 27 min; step 3, selecting the adding time of the rare earth, performing VD vacuum treatment, and adding the rare earth into a steel ladle in a throwing manner, wherein the adding amount is 25 kg/furnace;
by examining the gas content, i.e., T [ O ], of the product obtained in example 3]And H, the following results were obtained: t [ O ] of steel for high-strength oil gas exploitation fracturing pump]＝12×10-6；H＝0.5×10-6. The final product has yield strength Rel 954MPa, Rm 1130MPa, elongation A20%, area shrinkage Z57%, and impact energy KV at-20 deg.c2＝52J。
The new high-strength steel material (30 CrNi3MoVRE) for the oil and gas exploitation fracturing pump and the manufacturing method thereof effectively ensure the excellent comprehensive performance of the new high-strength steel material 30CrNi3MoVRE for the oil and gas exploitation fracturing pump by reasonably controlling the proportion of various alloy elements, key process control points and a scientific heat treatment system, and ensure that the material has higher compactness, higher cleanliness, more stable performance and longer service life.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a high strength oil gas exploitation steel for fracturing pump which characterized in that includes following component: 0.28 to 0.35 percent of carbon, 0.20 to 0.40 percent of silicon, 0.50 to 0.90 percent of manganese, 0.01 to 0.05 percent of vanadium, 1.20 to 1.45 percent of chromium, 0.35 to 0.65 percent of molybdenum, 2.90 to 3.30 percent of nickel, less than or equal to 0.20 percent of copper, 0.010 to 0.050 percent of aluminum, less than or equal to 0.010 percent of phosphorus, less than or equal to 0.010 percent of sulfur, 0.03 to 0.06 percent of rare earth elements, and the balance of iron and inevitable elements.
2. The steel for the high-strength oil and gas exploitation fracturing pump according to claim 1, wherein the steel for the high-strength oil and gas exploitation fracturing pump has a general porosity of 2.0 grade or less, a central porosity of 2.0 grade or less, ingot type segregation of 2.0 grade or less, point segregation of 1.0 grade or less, and a grain size of 6 grade or more, and is subjected to ultrasonic flaw detection according to GB/T6402-2008 standard, wherein the qualified grade is 4 grade, the equivalent flat-bottom hole diameter of the point discontinuity with length or density is 2mm or less, and the equivalent flat-bottom hole diameter of the single point discontinuity is 3mm or less.
3. The steel for the high-strength oil and gas production fracturing pump of claim 1, wherein the class A inclusions, the class B inclusions, the class C inclusions, the class D inclusions and the class Ds inclusions of the steel for the high-strength oil and gas production fracturing pump are controlled to be less than or equal to 1.0 grade, less than or equal to 1.5 grade, less than or equal to 1.0 grade.
4. The steel for high strength oil and gas production frac pump of claim 1 wherein said steel for high strength oil and gas production frac pump has T [ O ] O]The content is less than or equal to 20 multiplied by 10-6H content is controlled to be less than or equal to 2 multiplied by 10-6。
5. The steel for high strength oil and gas production frac pump of claim 1, wherein said high strength oil and gas production frac pumpThe yield strength Rel of the steel is more than or equal to 900MPa, the tensile strength Rm is more than or equal to 1060MPa, the elongation A is more than or equal to 18 percent, the reduction of area Z is more than or equal to 45 percent, and the impact energy KV at the temperature of minus 20 DEG C2≥40J。
6. A manufacturing method of steel for a high-strength oil and gas exploitation fracturing pump comprises the following steps:
(1) the electric furnace smelting adopts high molten iron proportion, the molten iron ratio is more than or equal to 60 percent, the phosphorus content of tapping is controlled to be less than or equal to 0.08 percent, the carbon content of tapping is controlled to be more than or equal to 0.20 percent, the tapping temperature is controlled to be 1620-1670 ℃, pure aluminum blocks are added according to the calculated amount of 0.040-0.090 percent of the first target aluminum in LF furnace steel, and a low-nitrogen recarburizing agent is adopted;
(2) the refining slag system adopts a high-alkalinity refining slag system, and the slag has binary alkalinity R (CaO/SiO)2)＝4～7，A(CaO/Al2O3) Adding 7-12 kg/t of refined lime, adding 300 kg/furnace of high-alkalinity premelted refined slag, adding furnace fluorite according to the actual condition of the refined slag to adjust the slag, using 20-50 kg of aluminum particles in batches according to the slag changing condition, performing diffusion deoxidation by using more than or equal to 80kg of carbon powder, maintaining the atmosphere by using SiC, adding more than or equal to 2kg/t, feeding 0.035% of aluminum wires, and considering the residue; controlling VD vacuum time to be more than or equal to 20min, and controlling soft blowing time to be 20-30 min;
(3) the rare earth addition time is determined after VD vacuum treatment, and the rare earth is added into a steel ladle in a throwing mode according to the reaction characteristics of rare earth alloy, wherein the addition amount is 25-30 kg per furnace;
(4) the heating time of the forging heating furnace is controlled for 10-12 h, the core of the steel ingot is heated to a specified temperature, the diffusion of segregation components is promoted, the soaking temperature is controlled to 1230 ℃, the coarse grains are prevented, and the initial forging temperature is as follows: 1220-1180 ℃ and finish forging temperature: 800-850 ℃; the forging ratio is more than or equal to 4;
(5) after sampling, carrying out integral heat treatment according to an equivalent test bar, carrying out sampling detection according to the quenching temperature of 860-880 ℃, the heat preservation time of 3h, the tempering temperature of 610-650 ℃, air cooling to room temperature, and ensuring that the yield strength Rel is more than or equal to 900MPa, Rm is more than or equal to 1060MPa, the elongation A is more than or equal to 17%, the reduction of area Z is more than or equal to 45%, and the impact power KV at the temperature of-20 ℃ is more than KV2≥40J。
7. The method for manufacturing the steel for the high-strength oil and gas production fracturing pump according to claim 6, wherein the low-nitrogen carburant in the step (1) comprises the following components: fixing carbon: 98.5%, moisture: 0.5%, ash content: 0.8% max, volatiles: 0.7% max, undersize particle size: 10 percent of the product, the model is ZCYJ-LNC from Steud to Metallurgical material resistance Co.
8. The manufacturing method of the steel for the high-strength oil and gas exploitation fracturing pump according to claim 6, wherein the forging temperature in the step (4) is 1180-1220 ℃, a lean operation method of cold-warm forging is adopted in the forging process, so that the surface temperature is reduced, and then in the subsequent forging process, good internal deformation can be ensured without generating cracks on the surface, so that the internal compactness of the product, namely the flaw detection index, can reach GB/T6402-2008 standard for ultrasonic flaw detection inspection, the qualified level is 4, the length or intensive point discontinuous equivalent flat bottom hole diameter is less than or equal to 2mm, and the single point discontinuous equivalent flat bottom hole diameter is less than or equal to 3 mm.
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