CN103409699A - Steel forging with ultra-high strength and ultra-high low-temperature impact on box body of fracturing pump valve and manufacturing method of steel forging - Google Patents
Steel forging with ultra-high strength and ultra-high low-temperature impact on box body of fracturing pump valve and manufacturing method of steel forging Download PDFInfo
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Abstract
The invention relates to a steel forging with an ultra-high strength and an ultra-high low-temperature impact on the box body of a fracturing pump valve and a manufacturing method of the steel forging. The steel forging is used for solving the technical problems of low mechanical performance, bad corrosion resistance, short service life, and high cost of the existing steel materials. The steel forging comprises the following chemical ingredients in percentage by weight: 0.25-0.3% of C, 0.15-0.35% of Si, 0.6-0.9% of Mn, 1.8-2.2% of Cr, 4.05-4.25% of Ni, 0.46-0.6% of Mo, 0.12-0.18% of V, not greater than 0.01% of P, not greater than 0.01% of S, not greater than 0.12% of Nb, not greater than 0.12% of Re, not greater than 0.2% of Cu, not greater than 0.00016% of H, not greater than 0.0035% of O, not greater than 0.0065% of N, and the balance of Fe and inevitable impurities. The steel forging disclosed by the invention can be used in the fields of petroleum exploitation and shale gas exploitation.
Description
Technical field
The equipment in oil, shale gas exploitation field that the present invention relates to, by material and manufacture method thereof, particularly relates to a kind of superstrength superelevation low-temperature impact Fracturing Pump Valve Box body steel forgings and manufacture method thereof.
Background technology
At present, in oil, shale gas exploitation field, fracturing technique can effectively improve the produced quantity of oil, shale gas, and fracturing pump is the key equipment in the pressure break recovery process.According to national economy and the 12 five-year-plan outline of social development to promoting production, the quality of optimizing structure, make better products, improve fundamental technology, improve the base mateiral R & D Level, realize the relevant requirements of the aspects such as key components and parts technology automatization, particularly country is more and more higher to the requirement that the petroleum vapour well promotes production capacity, increase output, also more and more higher to the technical requirements of fracturing pump.
Pressure break pump performance, q&r directly affect quality and the progress of pressure break implementation process, because the applying working condition of fracturing pump is very severe, require fracturing pump that higher pump pressure and larger discharge capacity are arranged, require it can bear high pressure, Cyclic Load, also require its can conveying high-pressure band medium of tempering, corroding, more require its can severe again operating mode under reliability service keeping higher work-ing life.Especially for the Fracturing Pump Valve Box body, relatively high requirement is arranged, require the pump valve casing not only will bear the pressure of superelevation, and will bear higher repeated load surging force and acid-alkali-corrosive-resisting power.In addition, because the temperature in extremely frigid zones winter is even lower in subzero 40 ℃ of left and right, therefore require the pump valve casing can bear low-temperature impact.So, meet above-mentioned requirements, will selection, the process for machining and manufacturing of the material of pump valve casing be improved, capture technical barrier.
The Fracturing Pump Valve Box body material generally used at present is to continue to use domestic 40CrNimoA, Russian 38CrNi2moV and the U.S.'s 4330 trade mark materials, processes through forging, and its work-ing life is only at 250～300h, and can not meet the normal use at extremely frigid zones.And the mechanical property of materials that existing forging technological method for processing is produced is strong, corrosion-resistant.In addition, while under the normal temperature operating mode, using, corrosion resistance is poor, work-ing life is short, cost is high, can not meet the demand of oil output and the exploitation of shale gas pressure break.So develop ultra-high voltage, superstrength, corrosion-resistant, very low temperature impelling strength, Ultra-fine Grained, be technical problem urgently to be resolved hurrily without the Fracturing Pump Valve Box body material of metallurgical imperfection.
Summary of the invention
The present invention is exactly in order to solve the problems of the technologies described above or one of at least, provide that a kind of superstrength, erosion resistance are stronger, super high impact toughness, Ultra-fine Grained, without metallurgical imperfection, superstrength superelevation low-temperature impact Fracturing Pump Valve Box body steel forgings and manufacture method thereof that cost is low.
The invention provides a kind of superstrength superelevation low-temperature impact Fracturing Pump Valve Box body steel forgings, the chemical composition of this forging steel is by weight percentage: C:0.25～0.3%, Si:0.15～0.35%, Mn:0.6～0.9%, Cr:1.8～2.2%, Ni:4.05～4.25%, Mo:0.46～0.6%, V:0.12～0.18%, P≤0.01%, S≤0.01%, Nb≤0.12%, Re≤0.12%, Cu≤0.2%, H≤0.00016%, 0≤0.0035%, N≤0.0065%, surplus are Fe and inevitable impurity.
The present invention also provides a kind of manufacture method of superstrength superelevation low-temperature impact Fracturing Pump Valve Box body steel forgings, comprises the steps:
1) steel-making;
2) heat tracing;
3) forge;
4) forge postheat treatment.
Preferably, its steel-making step is: electric arc furnace smelting-external refining-vacuum outgas-water injecting electrode base-esr-diffusion annealing.
Preferably, the heat tracing step adopts three sections heating methods to carry out, and three sections heating methods are specially: be incubated 7h at the temperature of 500 ℃ ± 10 ℃; Be warming up to 650 ℃ ± 10 ℃ insulation 5h; Be warming up to 850 ℃ ± 10 ℃ insulation 5h; Be warming up to 1180 ℃ ± 10 ℃ samming 3h; At the temperature of 1180 ℃ ± 10 ℃, be incubated 8h.
Preferably, first the steel ingot under normal temperature was put into to the process furnace below 200 ℃ before insulation, the temperature in stove is risen to 500 ℃ ± 10 ℃ according to the heat-up rate of 50 ℃/h; The heat-up rate that is warming up to 650 ℃ ± 10 ℃ of these processes is 60 ℃/h; The heat-up rate that is warming up to 850 ℃ ± 10 ℃ of these processes is 60 ℃/h; The heat-up rate that is warming up to 1180 ℃ ± 10 ℃ of these processes is 80 ℃/h.
Preferably, forge step and comprise that one heat forging and the second fire forge, each upset ratio is controlled at 2～2.5, and the pulling forging ratio is controlled at than 2～2.5, and total forging ratio is controlled at 8～12.
Preferably, forging the postheat treatment process is: the forging of forging process output is cooled to 450 ℃ in water smoke air cooling mode, then puts into process furnace and carry out normalizing+temper.
Preferably, normalizing+temper comprises the steps:
1) will be cooled to the forging of 450 ℃ puts into process furnace and at the temperature of 450 ℃ ± 10 ℃, is incubated 6h:
2) be warming up to 860 ℃ ± 10 ℃ samming 3h, insulation 7h;
3) forging evenly is cooled to 320 ℃ in water smoke air cooling mode after stove, taking out;
4) will be cooled to the forging of 320 ℃ puts into process furnace be incubated 7h under 320 ℃ ± 10 ℃;
5) be warming up to 660 ℃ ± 10 ℃, samming, insulation 72h;
When 6) blowing out, forging cool to 150 ℃ with the furnace, forging is entered to the hole heap after stove, taking out and be cooled to the normal temperature state.
Preferably, the final forging temperature of the forging of forging process output>850 ℃; The heat-up rate that is warming up to 860 ℃ ± 10 ℃ of these processes is 80 ℃/h; The heat-up rate that is warming up to 660 ℃ ± 10 ℃ of these processes is 60 ℃/h; The cooling rate that cools to 150 ℃ with the furnace is≤30 ℃/h.
Preferably, after the steel-making step completes, the steel ingot of making is tested, product after the assay was approved enters in the heat tracing process again, and concrete checking procedure is: at first the chemical composition of steel ingot is carried out to total analysis; Next is done metallurgical analysis and guarantees that in steel, nonmetal individual event inclusion is less than or equal to 1 grade, and oxide compound and Sulfide inclusion summation are less than or equal to 2 grades, and pattern segregation, center porosity are less than or equal to 1 grade, has not allowed general spot segregation and edge spot segregation to exist; Again do the ultrasonic flaw detection check, whether check exists metallurgical shrinkage cavity, crackle or coarse grain defect.
Preferably, to completing the forging that forges postheat treatment, carry out roughing and ultrasonic flaw detection, and carry out visual testing, dimensional inspection, line, sawing two ends clout and rough mill; Line, sawing again, then modifier treatment is carried out in sampling on the forging body, and the sample after modulation is done to mechanical property test and metallographic examination, after the assay was approved forging is carried out to mark, packing, warehouse-in.
The invention has the beneficial effects as follows:
1, expend a large amount of human and material resources and financial resources through experiment for a long time, developed that superstrength, erosion resistance are stronger, super high impact toughness, Ultra-fine Grained, without novel material and the manufacture method of metallurgical imperfection.Take to adjust chemical composition element ratio in steel, smelting process, remove the techniques such as harmful element, in forging, use the WRFFa Ji center suppress the special forging process of forging method and forge postheat treatment technique, tensile strength and the yield strength of fracturing pump material have been solved fully, guaranteed its ultra-high voltage working condition under 100～150MPa, guaranteed its surging force-40 ℃ of anti-repeated loads of Working environment, guaranteed its acid-alkali-corrosive-resisting and high temperature resistant, thoroughly solved the Fracturing Pump Valve Box body life time short, can under the high pressure operating mode, work for a long time, particularly under-40 ℃ of operating modes, work, surpassed the design requirements of American-European countries to the Fracturing Pump Valve Box body.
2, in steelmaking process, the carbon content in the minimizing steel≤0.3%, plasticity and the toughness of raising steel; Improve nickel content in steel >=4%, thereby improved the anti intercrystalline corrosion ability of material; Improve the chromium content in the steel>1.8%, thereby improved intensity, wear resistance and the antiseptic property of steel; Improve the molybdenum content of steel>0.45%, thereby improved the wear-resisting and shock resistance of steel, improved hardening capacity and the intensity of material; In steel, add the trace elements such as appropriate niobium and rare earth, effectively eliminate form and the distribution of other objectionable impurities and inclusion in steel, improve the as-cast structure in steel, improve antioxygenation and acidproof, the corrosion-resistant effect of material, due to refinement the crystal grain of steel, improved the low-temperature impact toughness of steel, reduced the fragility weight break point of steel, strengthen the creep strength of steel, can prevent the intergranular corrosion of oxidizing medium to steel, improved simultaneously the comprehensive strength of steel; In steel, add>0.12% vanadium, improved low-temperature impact toughness and the wear resistance of material, improved creep and the creep rupture strength of steel, greatly improved high temperature resistance, high pressure and the hydrogen-type corrosion ability of steel, larger raising the work-ing life of material; Controlled the content of P, S≤0.010%, avoided the macrosegregation of steel, cold short susceptibility under temper brittleness and cold condition, also avoided simultaneously hot-short and pore and the loose generation of steel, material can effectively prevent the hot and cold bad Effect on Mechanical Properties caused that splits of material self when different high temperature, the work of worst cold case condition; H≤1.6ppm, 0≤35ppm, N≤65ppm have been controlled, reduced the hydrogen richness in the steel, prevented the generation of the white point in the steel, avoided the generation of cold cracking, reduce and control oxygen level, can eliminate oxide inclusion and exist, improving plasticity and the toughness of steel, reduce nitrogen content, can avoid the aged brittleness that residual nitrogen causes effectively to control the residual volume of obnoxious flavour in the steel; Taked the electroslag remelting process smelting, further the inclusion in steel has been controlled, thereby reached the clarity of material, for next step forging is laid a solid foundation.
3, in forging process, the first fire adopts upper and lower large section wide plate to forge thick method and the WRF method is carried out radially compacting, twice upsetting pull, total forging ratio>8, i.e. seam the inside residual defect of material, increased again the density of forging, simultaneously further refinement crystal grain; The second fire continues to have increased jumping-up one time, compacting process radially, make total forging ratio>12, make fibrous tissue become the grid state, meet design requirements fully, after forging, adopted direct mistake to be chilled to 450 ℃, taken full advantage of the fast cold crystal grain thinning of waste heat after forging process for fuel, reduce fuel consumption, improved production efficiency.Adopt the Fracturing Pump Valve Box body forging of production of the present invention, manufacture, tensile strength Rm>1200MPa, yield strength Rp
0.2>1100MPa, unit elongation A>1.5%, relative reduction in area Z>50%, Charpy impact AKV (40 ℃)>78J, grain fineness number>8 grade.Met fully in the exploitation of oil, shale gas under different working conditions, to the design requirements in work-ing life of fracturing pump.
4, forge in postheat treatment, directly be cooled to 450 ℃, can take full advantage of the fast cold crystal grain thinning of preheating after forging process for fuel, reduced fuel consumption, improved production efficiency.
5, increase composition total analysis, metallographic examination and ultrasonic flaw detection check, filtered out the qualified materials of every quality index such as material composition, inclusion and non-destructive test(ing)(NDT).
Further aspect of the present invention, will, in the description of following embodiment, clearly be put down in writing.
The accompanying drawing explanation
Fig. 1 is the temperature-time chart of heat tracing process;
Fig. 2 is the temperature-time chart that forges the postheat treatment process;
Fig. 3 is internal fiber weave construction schematic diagram of the present invention;
Fig. 4 is the state graph before the steel ingot jumping-up;
Fig. 5 is the state graph after jumping-up;
Fig. 6 is the state graph of the cubic blank suppressed by the WRF method;
Fig. 7 is that upper and lower flat anvil pulls out the state graph of blank from all directions;
Fig. 8 is the blank state graph after having forged.
Embodiment
First, second and third and four embodiment
Select conventional raw materials, process electric arc furnace smelting-external refining-vacuum outgas-water these steps of injecting electrode base-esr-diffusion annealing starting material to be made to the steel ingot of chemical composition as shown in table 1.The steel ingot of this chemical composition meets the requirement of " C≤0.30, Si:0.15-0.35, Mn:0.6-0.9, S≤0.010, P≤0.010, Cr:1.80-2.20, Ni>4.00, M0>0.45, V:0.12-0.18, Cu≤0.20, Nb, the Re: appropriate, H≤1.6ppm, 0≤35ppm, N≤65ppm " that stipulate in the Q/HWG-QW07010-2011 standard.
Steel ingot chemical composition (wt%) in table 1 embodiment, surplus are Fe and inevitable impurity.
The 5th embodiment
1. steel-making:
Select conventional raw materials, process electric arc furnace smelting-external refining-vacuum outgas-water these steps of injecting electrode base-esr-diffusion annealing starting material to be made to the steel ingot of chemical composition as shown in table 1.The steel ingot of this chemical composition meets the requirement of " C≤0.30, Si:0.15--0.35, Mn:0.6--0.9, S≤0.010, P≤0.010, Cr:1.80-2.20, Ni>4.00, Mo>0.45, V:0.12-0.18, Cu≤0.20, Nb, the Re: appropriate, H≤1.6ppm, 0≤35ppm, N≤65ppm " that stipulate in the Q/HWG-QW07010-2011 standard.
2. check:
Electroslag remelting steel ingot is carried out to composition total analysis, metallographic examination and ultrasonic flaw detection check, filter out the qualified steel ingots of every quality index such as material composition, inclusion and non-destructive test(ing)(NDT).
Detailed process is at first the chemical composition of steel ingot to be carried out to total analysis, guarantees that the content of each composition is in the standard-required scope; Next is done metallurgical analysis and guarantees that in steel ingot, nonmetal individual event inclusion is not more than 1 grade, and oxide compound and Sulfide inclusion summation are not more than 2 grades, and pattern segregation, center porosity are not more than 1 grade, has not allowed general spot segregation and edge spot segregation to exist; Again do the ultrasonic flaw detection check, whether check exists metallurgical shrinkage cavity, crackle or coarse grain defect.The product that assurance enters next process is the product that conformance with standard requires.
3. heat tracing:
As shown in Figure 1, the steel ingot be up to the standards is carried out to heat tracing, the steel ingot under normal temperature is put into to the process furnace below 200 ℃.According to three sections heating methods, carry out heat tracing, first the temperature in stove is risen to 500 ℃ ± 10 ℃ according to the heat-up rate of 50 ℃/h, at the temperature of 500 ℃ ± 10 ℃, steel ingot is incubated to 7h, with the heat-up rate of 60 ℃/h, rise to 650 ℃ ± 10 ℃ and be incubated 5h again, then the heat-up rate with 60 ℃/h rises to 850 ℃ ± 10 ℃ insulation 5h, then with the heat-up rate of 80 ℃/h, rise to 1180 ℃ ± 10 ℃ samming 3h again, finally under 1180 ℃ ± 10 ℃, be incubated 8h.
4. forge:
This step is divided into one heat forging and the second fire forges, and in the accompanying drawing in following process, D means diameter, and H means height.
(1) one heat forging:
1. as shown in Figure 4 and Figure 5, the steel ingot that completes heat tracing is placed on the press upset die after process furnace, taking out, adopts upper and lower large section By Means of Upsetting, carry out large pressure jumping-up, upset ratio is to stop forging at 2～2.5 o'clock, upset ratio is controlled in 2～2.5 scope;
2. as shown in Figure 6 and Figure 7, the steel ingot that will complete again jumping-up radially is placed on upset die with the operating machine clamping, adopt radially compacting (WRF) of wide anvil, large upset plate is placed on steel ingot and radially suppresses along steel ingot, draught is 23%, stops forging after 180 seconds the steel ingot half-twist, adopts same method to repeat to suppress to cubic blank and stops forging 180 seconds, with upper and lower flat anvil, pull out blank from all directions, be controlled in 2～2.5 scope pulling out forging ratio;
3. from all directions blank continues to stand up on upset die, adopts upper and lower large section By Means of Upsetting to carry out large pressure jumping-up, and forging is stopped in upset ratio 2～2.5 o'clock, upset ratio is controlled in 2～2.5 scope;
4. will complete the 3. the blank of step radially be placed on upset die, adopt radially compacting (WRF) of wide anvil, large upset plate is placed on blank and radially suppresses along blank, draught is 23%, stop forging rear half-twist, adopt same method to repeat to suppress, draught is 23%, be depressed into behind four directions and pull out blank from all directions, be controlled in 2～2.5 scope pulling out forging ratio.Suppress 900 ℃ ± 10 ℃ of final forging temperatures, in forging process, the temperature control of steel ingot blank core is at 1050 ℃～1100 ℃;
5. finally will complete the blank of suppressing put into process furnace be heated to 1100 ℃ ± 10 ℃ the insulation 3h.
The upset ratio of this one heat forging is controlled at 2～2.5, and the pulling forging ratio is controlled at than 2～2.5, and total forging ratio is controlled at 8～12.
(1) second fire forges:
The blank that 1. will complete one heat forging, from process furnace, taking out and be placed on upset die, adopts upper and lower large section By Means of Upsetting, carries out large pressure jumping-up, and upset ratio is to stop forging at 2～2.5 o'clock, upset ratio is controlled in 2～2.5 scope;
The steel ingot that 2. will complete jumping-up radially is placed on upset die, adopt wide anvil radially compacting (WRF) blank is suppressed, draught is 20%, stop forging after 180 seconds by the blank half-twist, adopt same method to repeat to suppress, draught is 20%, stops forging 180 seconds after being depressed into into cubic blank;
Above-mentioned jumping-up and suppress steel ingot blank surface temperature in process and be controlled at 880 ℃～920 ℃, this temperature controlled purpose is to leave enough residue forgings ratio to next step finish forge, shaping, to prevent from forging coarse-grain, during the finishing corner angle, prevents chink;
3. as shown in Figure 8, with upper and lower flat anvil finish forge, shaping, alignment to blank, 850 ℃ ± 10 ℃ of final forging temperatures.
The upset ratio that the second fire forges is controlled at 2～2.5, and the pulling forging ratio is controlled at than 2～2.5, and total forging ratio is controlled at 8～12.
So far, whole forging process completes, the output forging.In whole forging process, each upset ratio is controlled at 2～2.5, the pulling forging ratio is controlled at than 2～2.5, total forging ratio is controlled at 8～12 and controls upset ratio >=2, its objective is in order to guarantee three compressive stress states of steel ingot core processing, and according to processing requirement, can meet the forging ratio in when pulling, further disperse the tiny flaws such as typing segregation.Suitably deviation may occur inevitably in the billet size in whole forging process, but does not affect forging effect.
5. forging postheat treatment:
Forging is cooled to 450 ℃ in water smoke air cooling mode, then puts into process furnace and carry out normalizing+temper.
As shown in Figure 2, detailed process is: the first step, and the forging of final forging temperature>850 ℃ is carried out to air blast, water smoke be chilled to by force 450 ℃ outside stove; Second step, put into process furnace by forging and be incubated 6h at the temperature of 450 ℃ ± 10 ℃; The 3rd step, be warming up to 860 ℃ ± 10 ℃ samming 3h to furnace temperature with the heat-up rate of 80 ℃/h, insulation 7h; The 4th step, evenly be chilled to 320 ℃ to forging by forging in water smoke air cooling mode soon after stove, taking out; The 5th step, put into process furnace by forging and be incubated 7h at the temperature of 320 ℃ ± 10 ℃; The 6th step, rise to 660 ℃ ± 10 ℃ by furnace temperature with the heat-up rate of 60 ℃/h, samming, insulation 72h; The 7th step, blowing out, while with stove, being cooled to 150 ℃ by the cooling rate of≤30 ℃/h, entering forging the hole heap and be cooled to the normal temperature state after stove, taking out.
Directly be cooled to 450 ℃, purpose is to take full advantage of the fast cold crystal grain thinning of preheating after forging process for fuel, has reduced fuel consumption, has improved production efficiency.
6. roughing and ultrasonic flaw detection:
To completing the forging that forges postheat treatment, carry out roughing; Forging is carried out visual testing, dimensional inspection, ultrasonic flaw detection, line, sawing two ends clout, rough mills.
7. modulation thermal treatment:
Line, sawing again, then modifier treatment is carried out in sampling on the forging body, and the sample after modulation is done to mechanical property test and metallographic examination, after the assay was approved forging is carried out to mark, packing, warehouse-in.
Be illustrated in figure 3 the internal fiber weave construction schematic diagram of forging steel of the present invention.
As shown in table 2 for the mechanical property table of forging steel of the present invention.
Table 2 mechanical property table.
The 6th embodiment
The embodiment of the present embodiment is with the 5th embodiment, wherein in the 3rd step heat tracing process, according to three sections heating methods, carry out heat tracing, first the temperature in stove is risen to 510 ℃ according to the heat-up rate of 50 ℃/h, at the temperature of 510 ℃, steel ingot is incubated to 7h, with the heat-up rate of 60 ℃/h, rise to 660 ℃ and be incubated 5 hours again, then with the heat-up rate of 60 ℃/h, rise to 860 ℃ and be incubated 5h, then with the heat-up rate of 80 ℃/h, rise to 1190 ℃ of samming 3h again, finally under 1190 ℃, be incubated 8h.
Wherein the 5th step is forged in the postheat treatment process, and the first step is carried out air blast, water smoke by the forging of final forging temperature>850 ℃ and is chilled to by force 450 ℃ outside stove; Second step, put into process furnace by forging and be incubated 6h under 460 ℃; The 3rd step, be warming up to 870 ℃ of samming 3h to furnace temperature with the heat-up rate of 80 ℃/h, insulation 7h; The 4th step, evenly be chilled to 320 ℃ to forging by forging in water smoke air cooling mode soon after stove, taking out; The 5th step, put into process furnace by forging and be incubated 7h under 330 ℃; The 6th step, be warming up to 670 ℃ by furnace temperature with the heat-up rate of 60 ℃/h, samming, insulation 72h; The 7th step, blowing out, while with stove, being cooled to 150 ℃ by the cooling rate of≤30 ℃/h, entering forging the hole heap and be cooled to the normal temperature state after stove, taking out.
The 7th embodiment
The embodiment of the present embodiment is with the 5th embodiment, wherein in the 3rd step heat tracing process, according to three sections heating methods, carry out heat tracing, first the temperature in stove is risen to 500 ℃ according to the heat-up rate of 50 ℃/h, at the temperature of 500 ℃, to steel ingot insulation 7h, then rise to 650 ℃ and be incubated 5h with the heat-up rate of 60 ℃/h, then with the heat-up rate of 60 ℃/h, rise to 850 ℃ and be incubated 5h, then with the heat-up rate of 80 ℃/h, rise to 1180 ℃ of samming 3h again, finally under 1180 ℃, be incubated 8h.
Wherein the 5th step is forged in the postheat treatment process, and the first step is carried out air blast, water smoke by the forging of final forging temperature>850 ℃ and is chilled to by force 450 ℃ outside stove; Second step, put into process furnace by forging and be incubated 6h under 450 ℃; The 3rd step, be warming up to 860 ℃ of samming 3h to furnace temperature with the heat-up rate of 80 ℃/h, insulation 7h; The 4th step, evenly be chilled to 320 ℃ to forging by forging in water smoke air cooling mode soon after stove, taking out; The 5th step, put into process furnace by forging and be incubated 7h under 320 ℃; The 6th step, be warming up to 660 ℃ by furnace temperature with the heat-up rate of 60 ℃/h, samming, insulation 72h; The 7th step, blowing out, while with stove, being cooled to 150 ℃ by the cooling rate of≤30 ℃/h, entering forging the hole heap and be cooled to the normal temperature state after stove, taking out.
The 8th embodiment
The embodiment of the present embodiment is with the 5th embodiment, wherein in the 3rd step heat tracing process, according to three sections heating methods, carry out heat tracing, first the temperature in stove is risen to 490 ℃ according to the heat-up rate of 50 ℃/h, at the temperature of 490 ℃, to steel ingot insulation 7h, then rise to 640 ℃ and be incubated 5h with the heat-up rate of 60 ℃/h, then with the heat-up rate of 60 ℃/h, rise to 840 ℃ and be incubated 5h, then with the heat-up rate of 80 ℃/h, rise to 1170 ℃ of samming 3h again, finally under 1170 ℃, be incubated 8h.
Wherein the 5th step is forged in the postheat treatment process, and the first step is carried out air blast, water smoke by the forging of final forging temperature>850 ℃ and is chilled to by force 450 ℃ outside stove; Second step, put into process furnace by forging and be incubated 6h under 440 ℃; The 3rd step, be warming up to 850 ℃ of samming 3h to furnace temperature with the heat-up rate of 80 ℃/h, insulation 7h; The 4th step, evenly be chilled to 320 ℃ to forging by forging in water smoke air cooling mode soon after stove, taking out; The 5th step, put into process furnace by forging and be incubated 7h under 310 ℃; The 6th step, be warming up to 650 ℃ by furnace temperature with the heat-up rate of 60 ℃/h, samming, insulation 72h; The 7th step, blowing out, while with stove, being cooled to 150 ℃ by the cooling rate of≤30 ℃/h, entering forging the hole heap and be cooled to the normal temperature state after stove, taking out.
The above,, only to the preferred embodiments of the present invention, is not limited to the present invention, the invention is not restricted to be used in oil, shale gas exploitation field, and for a person skilled in the art, the present invention can have various modifications and variations.Everyly in the claim limited range of invention, any modification of making, be equal to replacement, improvement etc., all should be within protection scope of the present invention.
Claims (11)
1. superstrength superelevation low-temperature impact Fracturing Pump Valve Box body steel forgings, it is characterized in that, the chemical composition of this forging steel is by weight percentage: C:0.25～0.3%, Si:0.15～0.35%, Mn:0.6～0.9%, Cr:1.8～2.2%, Ni:4.05～4.25%, Mo:0.46～0.6%, V:0.12～0.18%, P≤0.01%, S≤0.01%, Nb≤0.12%, Re≤0.12%, Cu≤0.2%, H≤0.00016%, 0≤0.0035%, N≤0.0065%, surplus are Fe and inevitable impurity.
2. the manufacture method of a superstrength superelevation low-temperature impact Fracturing Pump Valve Box body steel forgings claimed in claim 1, is characterized in that, comprises the steps:
1) steel-making;
2) heat tracing;
3) forge;
4) forge postheat treatment.
3. the manufacture method of superstrength superelevation low-temperature impact Fracturing Pump Valve Box body steel forgings according to claim 2, is characterized in that, described steel-making step is: electric arc furnace smelting-external refining-vacuum outgas-water injecting electrode base-esr-diffusion annealing.
4. the manufacture method of superstrength superelevation low-temperature impact Fracturing Pump Valve Box body steel forgings according to claim 2, it is characterized in that, described heat tracing step adopts three sections heating methods to carry out, and described three sections heating methods are: be incubated 7h at the temperature of 500 ℃ ± 10 ℃; Be warming up to 650 ℃ ± 10 ℃ insulation 5h; Be warming up to 850 ℃ ± 10 ℃ insulation 5h; Be warming up to 1180 ℃ ± 10 ℃ samming 3h; At the temperature of 1180 ℃ ± 10 ℃, be incubated 8h.
5. the manufacture method of superstrength superelevation low-temperature impact Fracturing Pump Valve Box body steel forgings according to claim 4, it is characterized in that, before insulation, first the steel ingot under normal temperature is put into to the process furnace below 200 ℃, the temperature in stove is risen to 500 ℃ ± 10 ℃ according to the heat-up rate of 50 ℃/h; The heat-up rate that is warming up to 650 ℃ ± 10 ℃ of these processes is 60 ℃/h; The heat-up rate that is warming up to 850 ℃ ± 10 ℃ of these processes is 60 ℃/h; The heat-up rate that is warming up to 1180 ℃ ± 10 ℃ of these processes is 80 ℃/h.
6. the manufacture method of superstrength superelevation low-temperature impact Fracturing Pump Valve Box body steel forgings according to claim 2, it is characterized in that, described forging step comprises that one heat forging and the second fire forge, each upset ratio is controlled at 2～2.5, the pulling forging ratio is controlled at than 2～2.5, and total forging ratio is controlled at 8～12; Radially compacting of wide anvil is adopted in the pulling distortion; Whole in adopting radially the compacting forging process temperature control of steel ingot blank core at 1050 ℃～1100 ℃.
7. the manufacture method of superstrength superelevation low-temperature impact Fracturing Pump Valve Box body steel forgings according to claim 2, it is characterized in that, described forging postheat treatment process is: the forging of forging process output is cooled to 450 ℃ in water smoke air cooling mode, then puts into process furnace and carry out normalizing+temper.
8. the manufacture method of superstrength superelevation low-temperature impact Fracturing Pump Valve Box body steel forgings according to claim 7, is characterized in that, described normalizing+temper comprises the steps:
1) will be cooled to the forging of 450 ℃ puts into process furnace and at the temperature of 450 ℃ ± 10 ℃, is incubated 6h:
2) be warming up to 860 ℃ ± 10 ℃ samming 3h, insulation 7h;
3) forging evenly is cooled to 320 ℃ in water smoke air cooling mode after stove, taking out;
4) will be cooled to the forging of 320 ℃ puts into process furnace be incubated 7h under 320 ℃ ± 10 ℃;
5) be warming up to 660 ℃ ± 10 ℃, samming, insulation 72h;
When 6) blowing out, forging cool to 150 ℃ with the furnace, forging is entered to the hole heap after stove, taking out and be cooled to the normal temperature state.
9. the manufacture method of superstrength superelevation low-temperature impact Fracturing Pump Valve Box body steel forgings according to claim 8, is characterized in that, the final forging temperature of the forging of described forging process output>850 ℃; The heat-up rate that is warming up to 860 ℃ ± 10 ℃ of these processes is 80 ℃/h; The heat-up rate that is warming up to 660 ℃ ± 10 ℃ of these processes is 60 ℃/h; The cooling rate that cools to 150 ℃ with the furnace is≤30 ℃/h.
10. according to the manufacture method of the described superstrength superelevation of claim 2-9 any one low-temperature impact Fracturing Pump Valve Box body steel forgings, it is characterized in that, after described steel-making step completes, the steel ingot of making is tested, product after the assay was approved enters in the heat tracing process again, and concrete checking procedure is: at first the chemical composition of steel ingot is carried out to total analysis; Next is done metallurgical analysis and guarantees that in steel, nonmetal individual event inclusion is less than or equal to 1 grade, and oxide compound and Sulfide inclusion summation are less than or equal to 2 grades, and pattern segregation, center porosity are less than or equal to 1 grade, has not allowed general spot segregation and edge spot segregation to exist; Again do the ultrasonic flaw detection check, whether check exists metallurgical shrinkage cavity, crackle or coarse grain defect.
11. the manufacture method according to the described superstrength superelevation of claim 2-9 any one low-temperature impact Fracturing Pump Valve Box body steel forgings, it is characterized in that, to completing the forging that forges postheat treatment, carry out roughing and ultrasonic flaw detection, and carry out visual testing, dimensional inspection, line, sawing two ends clout and rough mill; Line, sawing again, then modifier treatment is carried out in sampling on the forging body, and the sample after modulation is done to mechanical property test and metallographic examination, after the assay was approved forging is carried out to mark, packing, warehouse-in.
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Denomination of invention: Ultra high strength ultra high low temperature impact fracturing pump valve body steel forging and its manufacturing method Effective date of registration: 20201120 Granted publication date: 20170510 Pledgee: Xi'an innovation financing Company limited by guarantee Pledgor: SHAANXI HUAWEI POLYTRON TECHNOLOGIES Inc. Registration number: Y2020990001367 |
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