CN108220690A - The forging material and forging method of a kind of exhasut valve stem peculiar to vessel - Google Patents
The forging material and forging method of a kind of exhasut valve stem peculiar to vessel Download PDFInfo
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- CN108220690A CN108220690A CN201711464205.5A CN201711464205A CN108220690A CN 108220690 A CN108220690 A CN 108220690A CN 201711464205 A CN201711464205 A CN 201711464205A CN 108220690 A CN108220690 A CN 108220690A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/023—Alloys based on nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses the forging materials and forging method of a kind of exhasut valve stem peculiar to vessel.Its forging method is as follows：Step 1, vacuum induction melting pours into a mould millimeter electrode；Step 2, electroslag remelting refines；Step 3, variable cross-section pole forging technology；Step 4, contour forging technique；Wherein：When blank is kept the temperature, Pasting thermal insulation material includes adhesive thermal insulating cotton and high-temperature agglomerant；The high temperature adhesive is made of hardening agent, bonding agent, softening agent and accelerator for hardening, wherein：Hardening agent is silicate powder refractory material, and bonding agent is inorganic adhesive, and caustic soda or sodium carbonate are softening agent, and portland cement is accelerator for hardening；Step 5, the solution heat treatment of forging part blank and precipitation-hardening heat treatment.The forging of the present invention is matched with material chemical composition so that the case hardness and room temperature of material and the mechanical performance of high temperature greatly improve, and segregation is small, and hardness is evenly distributed.
Description
Technical field
The present invention relates to marine diesels, especially relate to the smelting of nickel base superalloy air discharging valve bar forging peculiar to vessel
Refining, forging method and manufacturing process.
Background technology
On two-stroke diesel engines (also referred to as host), the structure of air discharging valve bar blank is as shown in Fig. 2, with 800
For millimeter bore diesel engine, shape is for example horn-like, 450 millimeters of maximum gauge, just 110 millimeters of minimum diameter, length 1600
Millimeter, weight reaches 220kg, because its is complex-shaped, irregularly variation is big, and is nickel-base high-temperature alloy material in section, this material
Material easily generates segregation, and forging temperature is very narrow and easy forge crack, and requires that crystal grain is thin, mechanical performance all directions require one
It causes, causes to be difficult to hold in forging, be susceptible to forging defect and mechanical performance is unqualified.Above-mentioned high temperature alloy air discharging valve bar
Under the adverse circumstances of high temperature and exhaust gas corrosion, exhasut valve stem is the critical component of marine low speed diesel engine for long-term work, because
The quality of ventilation quality directly affects dynamic property, economy, reliability and the discharge of diesel engine.Due to it for a long time high temperature and easily
It works under the adverse circumstances of corrosion, the requirement of the heat-resisting quantity of air discharging valve bar, corrosion resistance and fatigue resistance is very high.It
Health status directly affects service life and the time between overhaul of diesel engine, also can be to other portions such as piston head, the cylinder jacket of diesel engine
Part has an impact.
In the Ni-based air discharging valve bar making material of the prior art, mechanical performance, hardness, carbide segregation are serious, grain size
It is difficult to technology requirement is not achieved.Air discharging valve bar long-term work is under the adverse circumstances of high temperature and exhaust gas corrosion, so technology refers to
Mark requirement is harsh, if failing to reach requirement, will appear when used for a long time be seriously worn, that surface generates etch pit, even high temperature is tired
Labor and be broken.It is broken in the marine main engine course of work if there is air discharging valve bar, just influences whether the safe operation of host.
If in addition, hardness and organizing undesirable, the easy Fast Wearing of exhasut valve stem sealing surface under high temperature and gas leakage soon, influence
To the service life of air discharging valve bar.
Invention content
For overcome the deficiencies in the prior art, the purpose of the present invention is to provide a kind of forgings of novel exhasut valve stem peculiar to vessel
It makes with material and forging method.The mechanical performance of exhasut valve stem all directions that the present invention makes is consistent, room temperature and high temperature hardness are high,
Crystal grain is tiny and distribution of carbides be uniformly segregated it is small.
Technical solution provided by the invention is specific as follows.
A kind of forging material of exhaust valve of marine diesel engine bar, according to percent by weight, including following component：
Remaining is Ni, and total weight meets 100%.
The present invention also provides a kind of forging methods of above-mentioned forging material, include the following steps：
Step 1, vacuum induction melting pours into a mould millimeter electrode；
Step 2, electroslag remelting refines；
Step 3, variable cross-section pole forging technology；
Step 4, contour forging technique；
Wherein：When blank is kept the temperature, Pasting thermal insulation material includes adhesive thermal insulating cotton and high-temperature agglomerant；The high temperature glues
Agent is connect to be made of hardening agent, bonding agent, softening agent and accelerator for hardening, wherein：Hardening agent be silicate powder refractory material, bonding agent
For inorganic adhesive, caustic soda or sodium carbonate are softening agent, and portland cement is accelerator for hardening；
Step 5, the solution heat treatment of forging part blank and precipitation-hardening heat treatment.
In above-mentioned steps 5, during solution heat treatment, selected temperature carries out solution heat treatment in 1020~1040 DEG C of temperature ranges
Reason, the fluctuation of temperature are no more than ± 14 DEG C, are cooled down in the oil or in water after high temperature solid solution；
In above-mentioned steps 5, when precipitation-hardening is heat-treated, treatment temperature is 690~710 DEG C, sky after heat preservation 15~17 hours
It is cold.
Based on above-mentioned technical proposal, the forging material and forging method of exhasut valve stem peculiar to vessel of the invention are relative to existing
Technology has following technological merit：
Firstth, the air discharging valve bar blank of nickel base superalloy of the invention, due to technical difficulty height, domestic no one before
It succeeds in developing, blank is dependent on import.
Secondth, nickel-base high-temperature alloy material chemical composition of the invention matches, and especially controls carbon therein, chromium, aluminium
With titanium elements content range so that the case hardness and room temperature of material and the mechanical performance of high temperature greatly improve, and segregation is small, and
Hardness is evenly distributed, and meets the manufacture of size exhasut valve stem blank.
Third, high temperature alloy forged steel material of the invention are protected in the forging process of air discharging valve bar using " Soft Roll set "
Temperature technique carries out heat preservation forging, just looks like that people has worn the heat preservation of part wadded jacket, the cooling speed of steel billet when " Soft Roll set " significantly slows forging
Degree increases substantially the deflection of steel billet One-time forging, reduces the deformation fire of steel billet, therefore the exhaust forged with the method
Valve rod is not easy forge crack, and crystal grain is tiny, and intensity is high.
Description of the drawings
Fig. 1 is air discharging valve bar blank variable cross-section pole shape graph on marine diesel.
Fig. 2 is air discharging valve bar blank schematic diagram on marine diesel.
Specific embodiment
We carry out the system of the sprocket wheel air discharging valve bar on the marine diesel to the present invention in conjunction with specific embodiments below
Make material and air discharging valve bar forging method is elaborated further, in the hope of the understanding present invention being more fully apparent from, but not
It can be limited the scope of the invention with this.
In embodiment 1, a kind of forging material of exhaust valve of marine diesel engine bar, according to percent by weight, including
Following component：
Remaining is Ni, and total weight meets 100%.
In material, Pb≤10ppm, Bi≤0.5ppm, Ag≤5ppm, Mg are as deoxidant element, addition control
0.07%.
The method that exhaust valve of marine diesel engine valve rod blank is made of above-mentioned high-temperature alloy material, this method are included such as
Lower step：
1. vacuum induction melting (VIM) pours into a mould 430 millimeters of electrodes of Ф, for 510 millimeters of ingots of remelting Ф.Technological requirement is such as
Under：
(1) furnace body cold conditions leak rate answer≤10 μ/point, furnace body vacuum degree answers≤10 μ during refining；
(2) when melting starts, the power of power transmission should be stepped up, is removed with the volatilization of sharp raw material surface gas；
(3) after raw material are melting down, Ni-C is added in, strengthens melt degassing by intensifying C-O reactions；
(4) refining period is transferred to after melting stage, after alloy refining, Al, Ti easy oxidation metal or alloy can be added in,
After easy oxidation metal or alloy are melting down, the refining of alloy should be carried out again, to improve the clarity of alloy；
(5) the easily scaling loss element such as B, Mg adds in the latter stage of VIM meltings, and the heat to improve alloy by micro- Mg alloyings adds
Work plasticity adds the Ar gas that should be passed through certain pressure during Ni-Mg to burner hearth；
(6) hot topping is put on electrode mould top, reduces the shrinkage cavity depth of cast electrode head to the greatest extent；
2. electroslag remelting (ESR) refines；Technological requirement is as follows：
(1) electroslag remelting is protected using argon gas；
(2) packing ratio (electrode diameter/crystallizer diameter) ＞ 0.7；
(3) using 4 yuan of remelting slag systems, slag system matches as follows：
CaF2：Al2O3：CaO：MgO=72：18：5：5.
When the Ti contents≤2.4% of resmelting electrode, in slag system separately plus 2% TiO2；
(4) quantity of slag：70Kg；
(5) speed is melted：4.3Kg/min.
3. variable cross-section pole forging technology control requirement
Air discharging valve bar using Ф 510 millimeters of ESR ingot forgings, 800 millimeters of cylinder diameters is as follows with variable cross-section pole step
The shape of 3.1 variable cross-section poles is shown in Fig. 1 with size requirement, the shape of variable cross-section pole.
The hammer cogging of 3.2 steel ingots
It is forged using quick forging machine, 510 millimeters of ESR ingots of Ф is forged to 340 millimeters of poles of Ф.
3.2.1 the heating process of steel ingot and ingot blank
The maximum heating temperature of steel ingot is controlled at 1160 DEG C ± 14 DEG C, at a temperature of 1160 DEG C, during the heat preservation of Heating Steel Ingots
Between should be no less than 4 hours；
Steel billet melts down heating and temperature control at 1160 DEG C ± 14 DEG C after per fire forging, and at a temperature of 1160 DEG C, steel billet, which melts down, to be added
The soaking time of heat should be no less than 1.5 hours.
3.2.2 hammer cogging deformation requirements
First fire, steel ingot pulling：Hit 420 millimeters of illiciumverum × 120 of head of ingot portion → 420 millimeter side → 420 millimeter illiciumverum → take
Millimeter, pressing tongs handle to 200 millimeters of Ф × about 500 millimeter；
Second fire, steel ingot pulling：Hit 420 millimeters of illiciumverum × 120 of ingot tail portion → 420 millimeter side → 420 millimeter illiciumverum → take
Millimeter, pressing tongs to the octagonal stick sections in 200 millimeters of Ф × about 500 millimeter → 420 millimeters it is average all two；
Third fire, 420 millimeters of octagonal base jumping-ups：Jumping-up is to the 1/2 of charge length, the blank average diameter about Ф after jumping-up
590 millimeters；
4th fire, the intermediate base pullings of 590 millimeters of Ф：590 millimeters of intermediate base → 420 millimeter of Ф side.
5th fire, the intermediate base pulling in 420 millimeters of sides：420 millimeters of side → 340 millimeter side → 340 millimeter pole or 340 millimeters
Octagonal base.
After 340 millimeters of poles or 340 millimeters of octagonal base surfaces are ground entirely, surface quality inspection is carried out, Ф is transferred to after qualified
230 millimeters of pole manufacturing processes.
3.2.3 the forging of 230 millimeters of poles of Ф
It is forged using diameter forging machine, 340 millimeters of poles or 340 millimeters of octagonal fiery diameters of base one is forged to 230 millimeters of circles of Ф
Stick.3.2.3.1 the heating process of 340 millimeters of poles of Ф
At a temperature of 1140 DEG C, the soaking time of 340 millimeters of poles or 340 millimeters of octagonal bases should be >=2 hours；
3.2.3.2 forging deformation requirement
340 millimeters of one fire of pole, multi-pass diameter are forged to 230 millimeters of poles of Ф, the maximum lengthening coefficient of single pass controls
About 1.4.After 230 millimeters of pole free end end faces of Ф are cut flat with after forging, forging variable cross-section pole process can be transferred to.
The manufacture requirement of 3.3 variable cross-section poles
It is forged using diameter forging machine, 230 millimeters of pole diameters of Ф is forged to variable cross-section pole.
3.3.1 230 millimeters of pole heating process of Ф
Maximum heating temperature is controlled at 1020 DEG C ± 14 DEG C, and soaking time >=1 hour, after heat preservation, 230 millimeters of poles of Ф go out
Stove clads adhesive thermal insulating cotton, since 230 pole free end end faces of Ф, clads length 600mm, pole cladding Pasting is adiabatic
Heating is melted down after cotton again, is melted down heating time >=0.5 hour.
3.3.2 the forging of variable cross-section pole
Clamp is forged 230 millimeters × 460 millimeters stick sections of the Ф of heating that will have cladded adhesive thermal insulating cotton into conduct, deformation
It is required that it is：230 millimeters of Ф × 110 millimeters of 460 millimeters → Ф × about 1570 millimeter, 110 millimeters/Ф of+Ф, 230 millimeters × 170 millis
After diameter forging, 110 millimeters of free end end faces of Ф are cut flat with, are cut after examining sample, by Fig. 1 variable cross-section pole shapes and size for rice
It is required that Length-fixing cutting blanking die forging 800 millimeters of cylinder diameter air discharging valve bars variable cross-section pole blank.
After first variable cross-section pole scale blanking, variable cross-section pole, Ф are subsequently produced on remaining 230 poles of Ф
230 millimeters × 170 millimeters of 110 millimeters of 230 millimeters × 440 millimeters → Ф × about 1480 millimeter, 110 millimeters/Ф of+Ф, by Ф 110
Millimeter free end end face is cut flat with, by Fig. 1 variable cross-section pole shapes and size requirement, Length-fixing cutting blanking die forging 80MC air bleeding valve valves
Bar variable cross-section pole blank；After forging, continue production variable cross-section pole by above-mentioned requirements on remaining 230 millimeters of poles of Ф,
Until terminate.
4. contour forging technique
4.1 exhasut valve stem die forgings
Using open type loose tooling forging.The upper mold of loose tooling forging assembling die is flat-die, lower die die cavity and air discharging valve bar disk ruler
Very little and shape matches, and position processes an axial circular hole with taper among lower die die cavity center, and circular hole minimum diameter should be big
In the D2 diameters of Fig. 1.Lower die is placed in above multiple hold mode modules, and branch hold mode module centers carry equal diametral axis to circular mode
Hole, diameter and lower die die cavity centre position the axial circular shape die hole minimum diameter of round die hole match, and lower die adds a support
Mold shaft is more than the D2 diameter pole length of Fig. 1 to the length of round die hole.
Mold materials use H13 and 5CrNiMo hot die steels.
4.2 contour forging technique
Die forging carries out on a hydraulic press.
4.2.1 billet size and shape：See Fig. 1；
4.2.2 mold preheating temperature：400~450 DEG C, after mold installation, combustion gas is lighted by flame ring and is continued to upper and lower
Mould mold heats；
4.2.3 blank heating technique：1020 ± 14 DEG C, soaking time >=2 hour；
4.2.4 blank Insulation
1. the Pasting thermal insulation material applied
The Pasting thermal insulation material of application includes adhesive thermal insulating cotton and special high-temperature agglomerant.Adhesive thermal insulating cotton can
It is pasted onto the die forging base surface of heating firm and solidly, adhesive thermal insulating cotton will not fall off in die forging process, can be with the deformation of die forging base
And become, realize that the hot processing window of die forging is not more than 60 DEG C；It is in the specific glass powder of Dispersed precipitate in adhesive thermal insulating cotton, in height
It is both binding agent and lubricant under temperature, is conducive to the demoulding of forging part.High-temperature agglomerant is by hardening agent, bonding agent, softening agent
And accelerator for hardening composition, wherein hardening agent is silicate powder refractory material, using inorganic adhesive as bonding agent, caustic soda or
Sodium carbonate is as softening agent, and portland cement is as accelerator for hardening.A kind of special high-temperature agglomerant has under room temperature to high temperature
Good adhesion strength waters high-temperature agglomerant with the front of double binding agents in adhesive thermal insulating cotton and glues adhesive thermal insulating cotton
The surface of hot steel billet or cold steel billet is attached to, the adhesion strength of adhesive thermal insulating cotton and billet surface can be strengthened, it is exhausted using Pasting
Hot cotton is aided with special high-temperature agglomerant and carries out heat preservation forging, opposite to carry out heat preservation forging only with adhesive thermal insulating cotton, shows
Write the operation quality that ground improves heat preservation forging.
2. after blank to temperature, it is small to melt down heat preservation >=0.5 for D1 diameters and transition region deformation position cladding adhesive thermal insulating cotton
When；
3. it during blank heating, for the indeformable D2 diameters pole position of die forging variable cross-section forging stick, is carried out using adiabatic cotton
Thermal stabilization shield, the heating at reduction D2 diameter poles position；
4. during die forging, lighting combustion gas by flame ring and blank being heated, intensive control hot processing window is not more than 60
DEG C, make final forging temperature control not less than 950 DEG C.
4.3 molding requirements
It is 50mm/ minutes to originate pressing speed, subsequent to carry out pressurize operation.
5. the solution heat treatment of air discharging valve bar
The solution heat treatment of 5.1 forging part blanks
5.1.1 the solution heat treatment under selected temperature in 1020~1040 DEG C of temperature ranges, the fluctuation of temperature is no more than ±
It 14 DEG C, is cooled down in the oil or in water after high temperature solid solution；
5.1.2 to prevent air discharging valve bar blank during solution heat treatment from bending, solution heat treatment in shaft furnace into
Row, and professional is sent to be monitored status of equipment and state of the art.
The precipitation-hardening heat treatment of 5.2 exhasut valve stems
Precipitation-hardening heat treatment carries out in chamber-type heating furnace, and treatment temperature is 700 DEG C, and the fluctuation of temperature is no more than ± 10
DEG C, it is air-cooled after keeping the temperature 16 hours.
In embodiment, control carbon, chromium, aluminium and titanium elements content range (carbon control 0.04~0.10%, chromium
Control is 18.0~22.0%, and 1.40~1.80%, titanium elements are controlled 2.30~2.80% for aluminium element control) so that material
Material is greatly improved in the mechanical performance of room temperature and high temperature, and distribution of carbides is uniformly segregated small, and hardness is evenly distributed, and meets big
The technology requirement of gas releasing valve for secondary bar blank, is specifically shown in Table 1.
Table 1
The high temperature alloy forged steel air discharging valve bar of the present invention in forging process, using a kind of " Soft Roll set " heat preservation technology into
Row heat preservation forging, just seems and has worn the heat preservation of part wadded jacket to forging, the cooling rate of " Soft Roll set " is significant when slowing down forging steel billet, greatly
Amplitude improves the deflection of steel billet One-time forging, reduces the deformation fire of steel billet, the air discharging valve bar forged with the method is not
Easy forge crack, and crystal grain is tiny, intensity is high.
Different carbon, chromium, aluminium and titanium elements content different influences is generated to intensity, by a large amount of Comparability test most
The content range of this four elements is determined eventually.Empirical tests are identified, meet state-of-the-art MDT brands marine low-speed bavin in the world today
The technology requirement of oil machine air discharging valve bar.
The exhaust valve of marine diesel engine valve rod manufacturing method of the present invention is by reasonably selecting the raw material of air discharging valve bar
It studies point and unconventional heat preservation " Soft Roll set " technology carries out isothermal forging method, reach and improve air discharging valve bar hardness, machinery
Performance simultaneously ensures that crystal grain is tiny, and high temperature alloy is overcome due to the narrow easy forge crack of forging temperature and to be gone out with traditional forging method in the past
The hard nut to crack of existing coarse grains.
Claims (4)
1. a kind of forging material of exhasut valve stem peculiar to vessel, which is characterized in that according to percent by weight, including such as the following group
Point：
Remaining is Ni, and total weight meets 100%.
2. a kind of forging method using forging material described in claim 1, which is characterized in that include the following steps：
Step 1, vacuum induction melting pours into a mould millimeter electrode；
Step 2, electroslag remelting refines；
Step 3, variable cross-section pole forging technology；
Step 4, contour forging technique；
Wherein：When blank is kept the temperature, Pasting thermal insulation material includes adhesive thermal insulating cotton and high-temperature agglomerant；The high temperature adhesive
It is made of hardening agent, bonding agent, softening agent and accelerator for hardening, wherein：Hardening agent is silicate powder refractory material, and bonding agent is nothing
Machine adhesive, caustic soda or sodium carbonate are softening agent, and portland cement is accelerator for hardening；
Step 5, the solution heat treatment of forging part blank and precipitation-hardening heat treatment.
3. forging method according to claim 2, which is characterized in that in step 5, during solution heat treatment, 1020~
Selected temperature carries out solution heat treatment in 1040 DEG C of temperature ranges, and the fluctuation of temperature is no more than ± 14 DEG C, in oil after high temperature solid solution
In or water in cool down.
4. forging method according to claim 2, which is characterized in that in step 5, when precipitation-hardening is heat-treated, processing temperature
It is 690~710 DEG C to spend, air-cooled after keeping the temperature 15~17 hours.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112626375A (en) * | 2020-12-25 | 2021-04-09 | 江苏新核合金科技有限公司 | Preparation method of novel nickel-based material for petroleum valve rod |
| CN112719175A (en) * | 2020-12-18 | 2021-04-30 | 陕西宏远航空锻造有限责任公司 | Die forging forming method and device for GH4169 alloy long shaft type forge piece |
| CN112756524A (en) * | 2020-12-18 | 2021-05-07 | 陕西宏远航空锻造有限责任公司 | Quasi-beta forging heating method and device for variable-section-thickness titanium alloy forging |
| CN112756532A (en) * | 2020-11-30 | 2021-05-07 | 沪东重机有限公司 | Manufacturing method of exhaust valve rod of marine low-speed diesel engine |
| CN114309389A (en) * | 2022-01-19 | 2022-04-12 | 张家港广大特材股份有限公司 | Forging method of long shaft bar |
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