CN103409699B - 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 present invention relates to oil, shale gas exploitation field set lay-by material and its manufacture method, it is more particularly to a kind of
Superhigh intensity super high-low temperature impacts pressure break pump valve casing steel forgings and its manufacture method.
Background technology
At present, in oil, shale gas exploitation field, fracturing technique can effectively improve the yield of oil, shale gas,
Fracturing pump is the key equipment in pressure break recovery process.According to the 12nd five-year-plan outline pair of national economy and social development
Manufacturing industry is promoted, is optimized structure, quality of making better products, is improved fundamental technology, improve basic material R ＆ D Level, realize closing
The relevant requirement of the aspects such as key parts technology automatization, particularly country lift production capacity to petroleum vapour well, increase yield
More and more higher is required, to the technical requirements of fracturing pump also more and more higher.
The performance of fracturing pump, q＆r directly affect the quality and progress of pressure break implementation process, because fracturing pump
Applying working condition it is very severe, it is desirable to fracturing pump has higher pump pressure and bigger discharge capacity, it is desirable to which it can bear high pressure, circulation and carry
Lotus acts on, and also requires the medium that its energy conveying high-pressure band is tempered, corroded, and more requires that reliability service is simultaneously under the operating mode that it can be severe again
Keep higher service life.There is of a relatively high requirement particularly with Fracturing Pump Valve Box body, it is desirable to which pump valve casing not only will
The pressure of superelevation is born, and to bear higher alternate load impulsive force and acid-alkali-corrosive-resisting power.Further, since high and cold
The temperature in area's winter is even lower at subzero 40 DEG C or so, therefore requires that pump valve casing can bear low-temperature impact.So, to meet
Above-mentioned requirements capture technical barrier it is necessary to be improved to the selection of the material of pump valve casing, process for machining and manufacturing.
The Fracturing Pump Valve Box body material for commonly using at present be continue to use domestic 40CrNimoA, Russia 38CrNi2moV and
The trade mark material of the U.S. 4330, forged to process, its service life can not be met in extremely frigid zones only in 250～300h
Normally use.And the existing mechanical property of materials produced of forging technological method for processing strong, corrosion-resistant.This
Outward, when using under room temperature operating mode, corrosion resistance is poor, service life is short, high cost, it is impossible to meet oil output and shale gas
The demand of pressure break exploitation.So develop supertension, superhigh intensity, corrosion-resistant, ultralow temperature impact flexibility, Ultra-fine Grained, without metallurgy
The Fracturing Pump Valve Box body material of defect has been technical problem urgently to be resolved hurrily.
The content of the invention
The present invention be exactly in order to solve above-mentioned technical problem or at least one, there is provided a kind of superhigh intensity, corrosion resistance
Higher, super high impact toughness, Ultra-fine Grained, the impact pressure break pump valve casing of the superhigh intensity super high-low temperature without metallurgical imperfection, low cost
Steel forgings and its manufacture method.
The present invention provides a kind of superhigh intensity super high-low temperature and impacts pressure break pump valve casing steel forgings, the chemistry of the forging steel into
Divide and be 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%, balance of Fe and inevitable
Impurity.
The present invention also provides the manufacture method that a kind of superhigh intensity super high-low temperature impacts pressure break pump valve casing steel forgings, including
Following steps：
1) make steel；
2) heating and thermal insulation；
3) forge；
4) heat treatment after forging.
Preferably, its steel-making step is：Electric arc furnace smelting-external refining-vacuum outgass-cast electrode billet-electroslag remelting-
Diffusion annealing.
Preferably, heating and thermal insulation step is carried out using three sections of heatings, and three sections of heatings are specially：At 500 DEG C ± 10 DEG C
At a temperature of be incubated 7h；It is warming up to 650 DEG C of ± 10 DEG C of insulation 5h；It is warming up to 850 DEG C of ± 10 DEG C of insulation 5h；Be warming up to 1180 DEG C ±
10 DEG C of samming 3h；8h is incubated at a temperature of 1180 DEG C ± 10 DEG C.
Preferably, first the steel ingot under room temperature was put into into less than 200 DEG C of heating furnace before insulation, the temperature in stove is pressed
500 DEG C ± 10 DEG C are risen to according to the programming rate of 50 DEG C/h；The programming rate for being warming up to 650 DEG C of ± 10 DEG C of this processes is 60 DEG C/
h；The programming rate for being warming up to 850 DEG C of ± 10 DEG C of this processes is 60 DEG C/h；It is warming up to the liter of 1180 DEG C of ± 10 DEG C of this processes
Warm speed is 80 DEG C/h.
Preferably, forging step includes one heat forging and the second fire time forging, each upset ratio control 2～
2.5, than 2～2.5, total forging ratio is controlled 8～12 the control of pulling forging ratio.
Preferably, heat treatment process is after forging：The forging that forging process is exported is cooled to into 450 in water smoke air cooling mode
DEG C, placing into heating furnace carries out normalizing+temper.
Preferably, normalizing+temper comprises the steps：
1) will be cooled to 450 DEG C of forging and be put into heating furnace to be incubated 6h at a temperature of 450 DEG C ± 10 DEG C：
2) 860 DEG C of ± 10 DEG C of samming 3h are warming up to, 7h is incubated；
3) 320 DEG C are uniformly cooled in water smoke air cooling mode after forging being taken out from stove；
4) will be cooled to 320 DEG C of forging and be put into heating furnace to be incubated 7h at 320 DEG C ± 10 DEG C；
5) 660 DEG C ± 10 DEG C are warming up to, samming, insulation 72h；
6) blowing out, when forging cools to 150 DEG C with the furnace, enters to cheat heap after forging is taken out from stove and is cooled to normal temperature state.
Preferably, 850 DEG C of final forging temperature ＞ of the forging of forging process output；It is warming up to 860 DEG C of ± 10 DEG C of this processes
Programming rate be 80 DEG C/h；The programming rate for being warming up to 660 DEG C of ± 10 DEG C of this processes is 60 DEG C/h；Cool to 150 with the furnace
DEG C cooling rate be≤30 DEG C/h.
Preferably, make steel after the completion of step, steel ingot is tested to made by, and product after the assay was approved enters back into heating
In insulating process, concrete testing sequence is：First complete analysis is carried out to the chemical composition of steel ingot；Next does Metallographic Analysis and ensures steel
In nonmetallic individual event field trash be less than or equal to 1 grade, oxide and Sulfide inclusion summation are less than or equal to 2 grades, pattern segregation, in
The heart is loose to be less than or equal to 1 grade, is not allow for general spot segregation and edge spot segregation is present；Ultrasonic flaw detection is done again
Inspection, checks whether there is metallurgical shrinkage cavity, crackle or coarse grain defect.
Preferably, the forging to completing heat treatment after forging carries out roughing and ultrasonic flaw detection, and carries out outward appearance
Inspection, dimension control, line, sawing two ends clout and rough mill；Line, sawing again, then sampling in forging body is carried out
Modifier treatment, to the sample after modulation mechanical property test and metal lographic examination are done, and forging is marked after the assay was approved, is wrapped
Dress, warehouse-in.
The invention has the beneficial effects as follows：
1st, substantial amounts of human and material resources and financial resources are expended through prolonged experiment, have developed superhigh intensity, corrosion resistance
Higher, super high impact toughness, Ultra-fine Grained, the new material without metallurgical imperfection and manufacture method.Take chemical composition unit in adjustment steel
The techniques such as plain ratio, smelting process, removal harmful element, WRF Fa Ji suppress at center the special forging of forging method used in forging
Technique and heat treatment after forging technique are made, the tensile strength and yield strength of pressure break material pump is completely solved, it is ensured that it is 100
Supertension working condition under～150MPa, it is ensured that its impulsive force in the anti-alternate load of -40 DEG C of working environments, it is ensured that its
Acid-alkali-corrosive-resisting and high temperature resistant, it is short thoroughly to solve Fracturing Pump Valve Box body life time, can long-time work under high pressure operating mode, it is special
It is not to work under -40 DEG C of operating modes, has exceeded design requirement of the American-European countries to Fracturing Pump Valve Box body.
2nd, in steelmaking process, carbon content≤0.3% in steel is reduced, improves the plasticity and toughness of steel；In improving steel
Nickel content >=4%, so as to improve the anti intercrystalline corrosion ability of material；Chromium content ＞ 1.8% in steel is improve, so as to improve
The intensity of steel, wearability and antiseptic property；The molybdenum content ＞ 0.45% of steel is improve, so as to improve the wear-resisting and anti-impact of steel
Performance is hit, the quenching degree and intensity of material is improve；The trace element such as appropriate niobium and rare earth are added in steel, steel is effectively eliminated
Form and the distribution of middle other harmful substances matter and field trash, improves the as-cast structure in steel, improve material antioxidation and
Acidproof, corrosion-resistant effect, the crystal grain due to having refined steel, improves the low-temperature impact toughness of steel, reduces the fragility turnover of steel
Point, enhances the creep strength of steel, is prevented from intercrystalline corrosion of the oxide isolation to steel, while improve the comprehensive strength of steel；
The vanadium of ＞ 0.12% is added in steel, the low-temperature impact toughness and wearability of material is improve, the creep that improve steel is strong with lasting
Degree, substantially increases high temperature resistance, high pressure and the hydrogen-type corrosion ability of steel, the larger service life that improve material；Control P, S
≤ 0.010% content, it is to avoid the macrosegregation of steel, cold short sensitivity under temper brittleness and cryogenic conditions, while also avoiding
The hot-short and pore of steel and loose generation, material can effectively be prevented in different high temperature, worst cold case conditional operation
Material itself is hot and cold to split the bad Effect on Mechanical Properties for causing；H≤1.6ppm, 0≤35ppm, N≤65ppm are controlled, is reduced
Hydrogen content in steel, prevents the generation of the white point in steel, it is to avoid the generation of cold cracking, reduces and control oxygen content, can disappear
Except oxide inclusion is present, the plasticity and toughness of steel is improved, reduce nitrogen content, aged brittleness caused by residual nitrogen can be avoided to have
The residual volume for controlling harmful gass in steel of effect；Electroslag remelting process smelting is taken, further the field trash in steel is entered
Control is gone, has been that next step forging is laid a solid foundation so as to reach the clarity of material.
3rd, in forging process, the first fire time forges thick method using upper and lower heavy in section wide plate and WRF methods carry out radial direction compacting, and two
Secondary upsetting pull, total forging ratio ＞ 8, the i.e. seam internal residual defect of material, increased the density of forging, while further thin again
Crystal grain is changed；Second fire continues to increased a jumping-up, and radial direction compacting process makes total forging ratio ＞ 12, makes fibrous tissue Cheng Fang
Trellis state, has fully met design requirement, and 450 DEG C are cooled to using direct mistake after forging, makes full use of waste heat rapid cooling after forging process for fuel
Crystal grain thinning, reduces fuel consumption, improves production efficiency.Using present invention production, the Fracturing Pump Valve Box body forging of manufacture,
Tensile strength Rm ＞ 1200MPa, yield strength Rp0.2＞ 1100MPa, elongation percentage A ＞ 1.5%, contraction percentage of area Z ＞ 50%, summer
Charpy AKV (- 40 DEG C) ＞ 78J, 8 grades of grain size ＞.Fully meet in oil, shale gas exploitation in different working conditions
Under, the design requirement to the service life of fracturing pump.
4th, after forging in heat treatment, 450 DEG C are directly cooled to, can make full use of preheat after forging process for fuel rapid cooling refinement brilliant
Grain, reduces fuel consumption, improves production efficiency.
5th, the inspection of composition complete analysis, metal lographic examination and ultrasonic flaw detection is increased, material composition, field trash is filtered out
The material qualified with every quality index such as nondestructive inspection.
Further aspect of the present invention, by the description of detailed description below, is clearly stated that.
Description of the drawings
Fig. 1 is the Temperature-time graph of a relation of heating and thermal insulation process；
Fig. 2 is the Temperature-time graph of a relation of heat treatment process after forging；
Fig. 3 is internal fiber organizational structure schematic diagram of the present invention；
Fig. 4 is the state diagram before steel ingot jumping-up；
Fig. 5 is the state diagram after jumping-up；
Fig. 6 is the state diagram of four square billets suppressed with WRF methods；
Fig. 7 is the state diagram that upper and lower flat anvil pulls out all directions blank；
Fig. 8 is the green state figure after having forged.
Specific embodiment
First, second and third and four embodiments
From conventional raw materials, through electric arc furnace smelting-external refining-vacuum outgass-cast electrode billet-electroslag remelting-
Diffusion annealing these steps make raw material on the steel ingot of chemical composition as shown in table 1.The steel ingot of the chemical composition meets
" C≤0.30, Si specified in Q/HWG-QW07010-2011 standards：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、Re：In right amount, H≤
The requirement of 1.6ppm, 0≤35ppm, N≤65ppm ".
Steel ingot chemical composition (wt%), balance of Fe and inevitable impurity in the embodiment of table 1.
5th embodiment
1. make steel：
From conventional raw materials, through electric arc furnace smelting-external refining-vacuum outgass-cast electrode billet-electroslag remelting-
Diffusion annealing these steps make raw material on the steel ingot of chemical composition as shown in table 1.The steel ingot of the chemical composition meets
" C≤0.30, Si specified in Q/HWG-QW07010-2011 standards：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、Re：In right amount, H≤
The requirement of 1.6ppm, 0≤35ppm, N≤65ppm ".
2. check：
The inspection of composition complete analysis, metal lographic examination and ultrasonic flaw detection is carried out to electroslag remelting steel ingot, material is filtered out
The qualified steel ingot of the items quality index such as composition, field trash and nondestructive inspection.
Detailed process is to carry out complete analysis to the chemical composition of steel ingot first, it is ensured that the content of each composition requires model in standard
In enclosing；Next does Metallographic Analysis and ensures that nonmetallic individual event field trash is not more than 1 grade in steel ingot, and oxide and Sulfide inclusion are total
No more than 2 grades, pattern segregation, center porosity are not more than 1 grade, be not allow for general spot segregation and edge spot segregation is deposited
；Ultrasonic flaw detection inspection is done again, checks whether there is metallurgical shrinkage cavity, crackle or coarse grain defect.Ensure to enter next
The product of procedure is the product that conformance with standard is required.
3. heating and thermal insulation：
As shown in figure 1, qualified steel ingot will be checked to carry out heating and thermal insulation, the steel ingot under room temperature is put into into less than 200 DEG C
In heating furnace.Heating and thermal insulation is carried out according to three sections of heatings, first 500 is risen to according to the programming rate of 50 DEG C/h to the temperature in stove
DEG C ± 10 DEG C, 7h is incubated to steel ingot at a temperature of 500 DEG C ± 10 DEG C, then 650 DEG C ± 10 are risen to the programming rate of 60 DEG C/h
DEG C and be incubated 5h, then 850 DEG C of ± 10 DEG C of insulation 5h are risen to the programming rate of 60 DEG C/h, subsequently with the intensification of 80 DEG C/h speed
Degree rises to 1180 DEG C of ± 10 DEG C of samming 3h, is finally incubated 8h at 1180 DEG C ± 10 DEG C.
4. forge：
The step be divided into one heat forging and second fire time forging, it is following during accompanying drawing in D represent diameter, H tables
Show height.
(1) one heat forging：
1. as shown in Figure 4 and Figure 5, it is placed on press upset die after is taken out from heating furnace the steel ingot for completing heating and thermal insulation
On, using upper and lower heavy in section Means of Upsetting, carry out big pressure jumping-up, upset ratio stops forging when being 2～2.5, upset ratio control 2～
2.5 in the range of；
2. as shown in Figure 6 and Figure 7, then the steel ingot operation machine for completing jumping-up is clamped and is radially placed on upset die, adopted
With wide anvil radial direction compacting (WRF), big upset plate is placed on steel ingot and is radially suppressed along steel ingot, drafts is 23%,
Steel ingot is rotated by 90 ° after stopping forging 180 seconds, is repeated to suppress to four square billets using same method and is stopped forging 180 seconds, use upper and lower flat anvil
All directions blank is pulled out, pulling forging ratio is controlled in the range of 2～2.5；
3. all directions blank is continued to stand up on upset die, big pressure jumping-up, upsetting is carried out using upper and lower heavy in section Means of Upsetting
Stop forging when slightly than 2～2.5, upset ratio is controlled in the range of 2～2.5；
4. the blank for 3. walking will be completed radially to be placed on upset die, using wide anvil radial direction compacting (WRF), big upsetting
Thick plate is placed on blank radially to be suppressed along blank, and drafts is 23%, stops being rotated by 90 ° after forging, using same method weight
Suppress again, drafts is 23%, be depressed into behind four directions and pull out all directions blank, pulling forging ratio is controlled in the range of 2～2.5.Suppress
900 DEG C ± 10 DEG C of final forging temperature, steel ingot blank core temperature control system is at 1050 DEG C～1100 DEG C in forging process；
5. the blank that finally will complete to suppress is put into heating furnace and is heated to 1100 DEG C of ± 10 DEG C of insulation 3h.
2～2.5, than 2～2.5, total forging ratio is controlled the control of pulling forging ratio for the upset ratio control of the one heat forging
8～12.
(1) second fire time forging：
1. the blank for completing one heat forging is taken out from heating furnace and is placed on upset die, using upper and lower heavy in section upsetting
Thick method, carries out big pressure jumping-up, and upset ratio stops forging when being 2～2.5, upset ratio is controlled in the range of 2～2.5；
2. the steel ingot for completing jumping-up is radially placed on upset die, blank is entered using wide anvil radial direction compacting (WRF)
Row is suppressed, and drafts is 20%, is rotated by 90 ° blank after stopping forging 180 seconds, repeats to suppress using same method, and drafts is
20%, it is depressed into into after four square billets and stops forging 180 seconds；
Above-mentioned jumping-up and steel ingot Preform surface temperature is controlled at 880 DEG C～920 DEG C during suppressing, the temperature controlled mesh
Be to leave enough remaining forging ratio to next step finish forge, shaping, to prevent from forging coarse-grain, during finishing corner angle chink is prevented；
3. as shown in figure 8, with upper and lower flat anvil finish forge, shaping, alignment to blank, 850 DEG C ± 10 DEG C of final forging temperature.
2～2.5, than 2～2.5, total forging ratio is controlled 8 the control of pulling forging ratio for the upset ratio control of the second fire time forging
～12.
So far, whole forging process is completed, and exports forging.In whole forging process, each upset ratio control 2～
2.5th, forging ratio control is pulled out than 2～2.5, total forging ratio control controls upset ratio >=2 8～12, its purpose is to ensure steel
Ingot core processes three compressive stress states, and forging ratio when can meet pulling according to technological requirement, and further dispersion sizing is inclined
The tiny flaws such as analysis.Billet size in whole forging process is not affected it may happen that inevitable appropriate deviation
Forging effect.
5. heat treatment after forging：
Forging is cooled to 450 DEG C in water smoke air cooling mode, and placing into heating furnace carries out normalizing+temper.
As shown in Fig. 2 detailed process is：The first step, by 850 DEG C of forging of final forging temperature ＞ air blast, water are carried out outside stove
Mist is cooled to by force 450 DEG C；Second step, is put into forging heating furnace and is incubated 6h at a temperature of 450 DEG C ± 10 DEG C；3rd step, stove
Temperature is warming up to 860 DEG C of ± 10 DEG C of samming 3h with the programming rate of 80 DEG C/h, is incubated 7h；4th step, after forging is taken out from stove
Forging is uniformly cooled to into soon 320 DEG C in water smoke air cooling mode；5th step, by forging temperature of the heating furnace at 320 DEG C ± 10 DEG C is put into
The lower insulation 7h of degree；6th step, rises to 660 DEG C ± 10 DEG C, samming, insulation 72h by furnace temperature with the programming rate of 60 DEG C/h；7th
Step, blowing out when being cooled to 150 DEG C by the cooling rate of≤30 DEG C/h with stove, enters to cheat heap after forging is taken out from stove and is cooled to
Normal temperature state.
Directly it is cooled to 450 DEG C, it is therefore an objective to make full use of preheating rapid cooling crystal grain thinning after forging process for fuel, reduce fuel and disappear
Consumption, improves production efficiency.
6. roughing and ultrasonic flaw detection：
Forging to completing heat treatment after forging carries out roughing；Appearance test, dimension control, ultrasound wave are carried out to forging
Nondestructive inspection, line, sawing two ends clout, rough mill.
7. heat treatment is modulated：
Line, sawing again, then sampling carries out modifier treatment in forging body, and to the sample after modulation mechanical property is done
Can test and metal lographic examination, forging is marked after the assay was approved, pack, put in storage.
It is illustrated in figure 3 the internal fiber organizational structure schematic diagram of forging steel of the present invention.
It is as shown in table 2 the mechanical property table of forging steel of the present invention.
The mechanical property table of table 2.
Sixth embodiment
The embodiment of the present embodiment wherein during third step heating and thermal insulation, is heated with the 5th embodiment according to three sections
Method carries out heating and thermal insulation, first rises to 510 DEG C according to the programming rate of 50 DEG C/h to the temperature in stove, right at a temperature of 510 DEG C
Steel ingot is incubated 7h, then rises to 660 DEG C with the programming rate of 60 DEG C/h and be incubated 5 hours, then with the programming rate liter of 60 DEG C/h
To 860 DEG C and 5h is incubated, subsequently 1190 DEG C of samming 3h is risen to the programming rate of 80 DEG C/h, be finally incubated at 1190 DEG C
8h。
After the forging of wherein the 5th step in heat treatment process, the first step carries out 850 DEG C of forging of final forging temperature ＞ outside stove
Air blast, water smoke are cooled to by force 450 DEG C；Second step, is put into forging heating furnace and is incubated 6h at 460 DEG C；3rd step, furnace temperature with 80
DEG C/programming rate of h is warming up to 870 DEG C of samming 3h, is incubated 7h；4th step, by forging with water smoke after forging is taken out from stove
Air cooling mode is uniformly cooled to soon 320 DEG C；5th step, is put into forging heating furnace and is incubated 7h at 330 DEG C；6th step, by furnace temperature
670 DEG C are warming up to the programming rate of 60 DEG C/h, samming, insulation 72h；7th step, blowing out is fast by the cooling of≤30 DEG C/h with stove
Degree is when being cooled to 150 DEG C, enters to cheat heap after forging is taken out from stove and is cooled to normal temperature state.
7th embodiment
The embodiment of the present embodiment wherein during third step heating and thermal insulation, is heated with the 5th embodiment according to three sections
Method carries out heating and thermal insulation, first rises to 500 DEG C according to the programming rate of 50 DEG C/h to the temperature in stove, right at a temperature of 500 DEG C
Steel ingot is incubated 7h, then rises to 650 DEG C with the programming rate of 60 DEG C/h and be incubated 5h, is then risen to the programming rate of 60 DEG C/h
850 DEG C and 5h is incubated, subsequently 1180 DEG C of samming 3h is risen to the programming rate of 80 DEG C/h, be finally incubated 8h at 1180 DEG C.
After the forging of wherein the 5th step in heat treatment process, the first step carries out 850 DEG C of forging of final forging temperature ＞ outside stove
Air blast, water smoke are cooled to by force 450 DEG C；Second step, is put into forging heating furnace and is incubated 6h at 450 DEG C；3rd step, furnace temperature with 80
DEG C/programming rate of h is warming up to 860 DEG C of samming 3h, is incubated 7h；4th step, by forging with water smoke after forging is taken out from stove
Air cooling mode is uniformly cooled to soon 320 DEG C；5th step, is put into forging heating furnace and is incubated 7h at 320 DEG C；6th step, by furnace temperature
660 DEG C are warming up to the programming rate of 60 DEG C/h, samming, insulation 72h；7th step, blowing out is fast by the cooling of≤30 DEG C/h with stove
Degree is when being cooled to 150 DEG C, enters to cheat heap after forging is taken out from stove and is cooled to normal temperature state.
8th embodiment
The embodiment of the present embodiment wherein during third step heating and thermal insulation, is heated with the 5th embodiment according to three sections
Method carries out heating and thermal insulation, first rises to 490 DEG C according to the programming rate of 50 DEG C/h to the temperature in stove, right at a temperature of 490 DEG C
Steel ingot is incubated 7h, then rises to 640 DEG C with the programming rate of 60 DEG C/h and be incubated 5h, is then risen to the programming rate of 60 DEG C/h
840 DEG C and 5h is incubated, subsequently 1170 DEG C of samming 3h is risen to the programming rate of 80 DEG C/h, be finally incubated 8h at 1170 DEG C.
After the forging of wherein the 5th step in heat treatment process, the first step carries out 850 DEG C of forging of final forging temperature ＞ outside stove
Air blast, water smoke are cooled to by force 450 DEG C；Second step, is put into forging heating furnace and is incubated 6h at 440 DEG C；3rd step, furnace temperature with 80
DEG C/programming rate of h is warming up to 850 DEG C of samming 3h, is incubated 7h；4th step, by forging with water smoke after forging is taken out from stove
Air cooling mode is uniformly cooled to soon 320 DEG C；5th step, is put into forging heating furnace and is incubated 7h at 310 DEG C；6th step, by furnace temperature
650 DEG C are warming up to the programming rate of 60 DEG C/h, samming, insulation 72h；7th step, blowing out is fast by the cooling of≤30 DEG C/h with stove
Degree is when being cooled to 150 DEG C, enters to cheat heap after forging is taken out from stove and is cooled to normal temperature state.
The above is not limited to the present invention only to the preferred embodiments of the present invention, the invention is not restricted to use
In oil, shale gas exploitation field, for a person skilled in the art, the present invention can have various modifications and variations.It is all
It is that in the range of the claim of invention is limited, any modification, equivalent substitution and improvements done etc. all should be in the guarantor of the present invention
Within the scope of shield.
Claims (6)
1. a kind of superhigh intensity super high-low temperature impacts the manufacture method of pressure break pump valve casing steel forgings, it is characterised in that the forging
The chemical composition of 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%, O≤0.0035%, N≤0.0065%, balance of Fe
With inevitable impurity；
The manufacture method comprises the steps：
(1) make steel；
(2) heating and thermal insulation；The heating and thermal insulation step is carried out using three sections of heatings, and three sections of heatings are：500 DEG C ±
7h is incubated at a temperature of 10 DEG C；It is warming up to 650 DEG C of ± 10 DEG C of insulation 5h；It is warming up to 850 DEG C of ± 10 DEG C of insulation 5h；It is warming up to 1180
DEG C ± 10 DEG C of samming 3h；8h is incubated at a temperature of 1180 DEG C ± 10 DEG C；
(3) forge, forging step includes one heat forging and the second fire time forging, each upset ratio control 2～2.5,
Than 2～2.5, total forging ratio is controlled 8～12 the control of pulling forging ratio；Pulling deformation is using wide anvil radial direction compacting；Entirely adopting
Controlled at 1050 DEG C～1100 DEG C with steel ingot blank core temperature in radial direction compacting forging process；
(4) heat treatment after forging, heat treatment process is after forging：The forging that forging process is exported is cooled down in water smoke air cooling mode
To 450 DEG C, placing into heating furnace carries out normalizing+temper；
Normalizing+the temper comprises the steps：
1) will be cooled to 450 DEG C of forging and be put into heating furnace to be incubated 6h at a temperature of 450 DEG C ± 10 DEG C；
2) 860 DEG C of ± 10 DEG C of samming 3h are warming up to, 7h is incubated；
3) 320 DEG C are uniformly cooled in water smoke air cooling mode after forging being taken out from stove；
4) will be cooled to 320 DEG C of forging and be put into heating furnace to be incubated 7h at 320 DEG C ± 10 DEG C；
5) 660 DEG C ± 10 DEG C are warming up to, samming, insulation 72h；
6) blowing out, when forging cools to 150 DEG C with the furnace, enters to cheat heap after forging is taken out from stove and is cooled to normal temperature state.
2. superhigh intensity super high-low temperature according to claim 1 impacts the manufacture method of pressure break pump valve casing steel forgings, its
It is characterised by, the steel-making step is：Electric arc furnace smelting-external refining-vacuum outgass-cast electrode billet-electroslag remelting-expansion
Dissipate annealing.
3. superhigh intensity super high-low temperature according to claim 1 impacts the manufacture method of pressure break pump valve casing steel forgings, its
It is characterised by, first the steel ingot under room temperature was put into into less than 200 DEG C of heating furnace before insulation, to the temperature in stove according to 50
DEG C/programming rate of h rises to 500 DEG C ± 10 DEG C；The programming rate for being warming up to 650 DEG C of ± 10 DEG C of this processes is 60 DEG C/h；Rise
The programming rate of temperature to 850 DEG C of ± 10 DEG C of this processes is 60 DEG C/h；It is warming up to the intensification speed of 1180 DEG C of ± 10 DEG C of this processes
Degree is 80 DEG C/h.
4. superhigh intensity super high-low temperature according to claim 1 impacts the manufacture method of pressure break pump valve casing steel forgings, its
It is characterised by, 850 DEG C of final forging temperature ＞ of the forging of the forging process output；It is warming up to 860 DEG C of ± 10 DEG C of this processes
Programming rate is 80 DEG C/h；The programming rate for being warming up to 660 DEG C of ± 10 DEG C of this processes is 60 DEG C/h；Cool to 150 DEG C with the furnace
Cooling rate be≤30 DEG C/h.
5. superhigh intensity super high-low temperature according to claim 4 impacts the manufacture method of pressure break pump valve casing steel forgings, its
It is characterised by, after the completion of the steel-making step, steel ingot is tested to made by, product after the assay was approved enters back into heating guarantor
During temperature, concrete testing sequence is：First complete analysis is carried out to the chemical composition of steel ingot；Next does Metallographic Analysis and ensures in steel
Nonmetallic individual event field trash is less than or equal to 1 grade, and oxide and Sulfide inclusion summation are less than or equal to 2 grades, pattern segregation, center
It is loose to be less than or equal to 1 grade, it is not allow for general spot segregation and edge spot segregation is present；Ultrasonic flaw detection inspection is done again
Test, check whether there is metallurgical shrinkage cavity, crackle or coarse grain defect.
6. superhigh intensity super high-low temperature according to claim 4 impacts the manufacture method of pressure break pump valve casing steel forgings, its
It is characterised by, the forging to completing heat treatment after forging carries out roughing and ultrasonic flaw detection, and carries out appearance test, chi
Very little inspection, line, sawing two ends clout and rough mill；Line, sawing again, then sampling carries out quenched place in forging body
Reason, to the sample after modulation mechanical property test and metal lographic examination are done, and forging is marked after the assay was approved, packs, is put in storage.
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| CN105296845B (en) * | 2015-10-21 | 2017-04-26 | 苏州雷格姆海洋石油设备科技有限公司 | Manufacturing method for ultra-low-temperature corrosion-resistant high-strength forge piece blank |
| CN106521326A (en) * | 2016-12-19 | 2017-03-22 | 苏州金威特工具有限公司 | Shear-steel |
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| JP2712702B2 (en) * | 1990-02-06 | 1998-02-16 | 住友金属工業株式会社 | Steel for pressure vessels |
| JPH059662A (en) * | 1991-07-08 | 1993-01-19 | Daido Steel Co Ltd | Steel material for crankshaft of press forging machine |
| JPH05117810A (en) * | 1991-10-28 | 1993-05-14 | Daido Steel Co Ltd | Wedge for adjusting die position in high speed forging machine |
| CN102357626B (en) * | 2011-08-27 | 2013-06-26 | 江阴振宏重型锻造有限公司 | Method for forging and pressing semi-coupler with large section and high height-diameter ratio by using 31.5 MN of oil press |
| JP5856485B2 (en) * | 2012-01-11 | 2016-02-09 | 株式会社神戸製鋼所 | Forged product and manufacturing method thereof |
| CN103160665B (en) * | 2013-04-11 | 2014-08-13 | 南京迪威尔高端制造股份有限公司 | Manufacturing method of steel forging for shale gas acquisition pressure equipment mud pump cylinder |
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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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