CN108247284A - A kind of manufacturing method of low temperature heavy duty high-performance safe locking pin - Google Patents
A kind of manufacturing method of low temperature heavy duty high-performance safe locking pin Download PDFInfo
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- CN108247284A CN108247284A CN201711260445.3A CN201711260445A CN108247284A CN 108247284 A CN108247284 A CN 108247284A CN 201711260445 A CN201711260445 A CN 201711260445A CN 108247284 A CN108247284 A CN 108247284A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 239000011265 semifinished product Substances 0.000 claims abstract description 185
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 138
- 239000000956 alloy Substances 0.000 claims abstract description 138
- 238000005242 forging Methods 0.000 claims abstract description 47
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 238000007514 turning Methods 0.000 claims abstract description 13
- 238000013021 overheating Methods 0.000 claims abstract description 9
- 238000010791 quenching Methods 0.000 claims description 62
- 230000000171 quenching effect Effects 0.000 claims description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- 238000010438 heat treatment Methods 0.000 claims description 38
- 238000005496 tempering Methods 0.000 claims description 29
- 238000012360 testing method Methods 0.000 claims description 28
- 238000001514 detection method Methods 0.000 claims description 26
- 238000007689 inspection Methods 0.000 claims description 23
- 238000000137 annealing Methods 0.000 claims description 21
- 238000012545 processing Methods 0.000 claims description 21
- 229910001566 austenite Inorganic materials 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 16
- 239000013078 crystal Substances 0.000 claims description 16
- 238000011534 incubation Methods 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 16
- 238000002791 soaking Methods 0.000 claims description 15
- 238000009792 diffusion process Methods 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims description 12
- 229910000734 martensite Inorganic materials 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 12
- 230000008602 contraction Effects 0.000 claims description 11
- 239000006249 magnetic particle Substances 0.000 claims description 11
- 238000003801 milling Methods 0.000 claims description 9
- 238000010183 spectrum analysis Methods 0.000 claims description 9
- 238000009864 tensile test Methods 0.000 claims description 8
- 238000005204 segregation Methods 0.000 claims description 7
- 229910001563 bainite Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 2
- 230000035939 shock Effects 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 49
- 239000010959 steel Substances 0.000 abstract description 49
- 239000000835 fiber Substances 0.000 abstract description 5
- 238000005096 rolling process Methods 0.000 description 25
- 239000000047 product Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 229910001567 cementite Inorganic materials 0.000 description 4
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of manufacturing method of low temperature heavy duty high-performance safe locking pin, step A intercepts alloy billet, and the alloy billet of interception is forged；Step B, copying is carried out to the alloy billet being cooled to room temperature, i.e., rough turning is carried out to alloy billet and rough mills tooth copying, so as to obtain the semi-finished product of safe locking pin；Step C, is heat-treated semi-finished product；Step D carries out semifinishing and finishing, so as to obtain low temperature heavy duty high-performance safe locking pin to the semi-finished product after Overheating Treatment.The alloy billet of interception is forged, the alloy billet consistency that the mode of forging obtains is high, good toughness and steel fibre composition centainly uniformly flow to form；It in copying into after the semi-finished product, is heat-treated so that the mechanical property performance of semi-finished product is excellent, and the advantages that intensity is high, elongation percentage is big and impact flexibility is high is still maintained under low temperature environment (40 DEG C).
Description
Technical field
The present invention relates to ocean platform safe locking pin manufacturing field more particularly to a kind of low temperature heavy duty high-performance safety locks
The manufacturing method tightly sold.
Background technology
Lifting gear is the key component of self-lifting type marine drilling platform, act as allowing spud leg and hull make it is opposite up and down
Movement, so that main platform body can move up and down and be fixed in some position of spud leg.Due to maritime environment complexity
Changeable, offshore work platform by distinguished and admirable, ocean current is impacted and drifts along load effect at any time, therefore usually increases in jacking system and pacify
Full locking pin locks spud leg, to prevent under non-lift operating mode spud leg because being impacted by distinguished and admirable, ocean current and load of drifting along
Lotus acts on and occurs significantly to shake, and improves operational security.Safe locking pin will not only bear the substantial load of spud leg, also
Severe maritime environment, therefore critical component of the safe locking pin as lifting gear are chronically at, manufacturing process requirement is high.
But existing safe locking pin manufacturing method first, using rolled steel, is susceptible to that density is loose or a large amount of contractings
The bad phenomenon in hole；Two are a lack of heat treatment process, under -10~-30 DEG C of low temperature environment, existing safe locking pin mechanics
Performance just substantially reduces, and generates brittleness, cracky, replacing safe locking pin needs high maintenance cost；Third, existing safety
Locking pin is easily broken off under the environment of low temperature heavy duty, and there are great security risks.
Invention content
It is an object of the invention to propose a kind of manufacturing method of low temperature heavy duty high-performance safe locking pin so that produce
The safe locking pin come still maintains excellent mechanical performance, not easy to break, wear-resistant, service life under low temperature heavy duty environment
It is long.
For this purpose, the present invention uses following technical scheme：
A kind of manufacturing method of low temperature heavy duty high-performance safe locking pin, includes the following steps：
Step A intercepts alloy billet, and the alloy billet of interception is forged：
Step A1 is heated to the alloy billet 1200~1300 DEG C, and keeps the temperature 14~15h；
Step A2 carries out rough forge, wherein the starting forging temperature of the rough forge to the alloy billet after heating and thermal insulation
It it is 1100~1200 DEG C, the final forging temperature of the rough forge is >=1000 DEG C；
Step A3 is diffused annealing to the alloy billet after rough forge, wherein the diffusion annealing
Heating temperature is 1100~1200 DEG C, and keeps the temperature 14~15h；
Step A4 carries out finish forge, wherein the starting forging temperature of the finish forge to the alloy billet after diffusion annealing
It it is 1000~1100 DEG C, the final forging temperature of the finish forge is >=900 DEG C；
Step A5 is heated to the alloy billet normalizing after finish forge 880 DEG C, keeps the temperature 14~15h；, then it is air-cooled
Temper is carried out after being cooled to less than 200 DEG C, the temperature is 680 DEG C, keeps the temperature 14h, then comes out of the stove and be air-cooled to room temperature；
Step B carries out copying to the alloy billet that is cooled to room temperature, i.e., the alloy billet is carried out rough turning and
Rough milling, so as to obtain the semi-finished product of safe locking pin；
Step C is heat-treated the semi-finished product；
Step D carries out semifinishing and finishing to the semi-finished product after Overheating Treatment, so as to obtain low temperature heavy duty
High-performance safe locking pin.
Preferably, step E is further included, the parameters of the low temperature heavy duty high-performance safe locking pin are examined, if every
Parameter is qualified then can packaging and storage.
Preferably, the step C includes following sub-step：
Step C1 carries out heating and thermal insulation to the semi-finished product；
Step C2 quenches the semi-finished product after heating in water base quenching cycles pond, and water base quenching is controlled to follow
Liquid temperature in cisterna ambiens is 30~55 DEG C, and the cool time is 25~30min, cooling temperature≤150 DEG C of the semi-finished product；
The quenched semi-finished product are put into tempering furnace and are tempered by step C3, and temperature is 590~610 DEG C, is protected
The warm time is 14h；
Step C4 quenches the semi-finished product that tempering is come out of the stove again in water base quenching cycles pond, and control is water base
30~55 DEG C of liquid temperature in quenching cycles pond, the cool time be 25~30min, cooling temperature≤150 DEG C of the semi-finished product；So
Posterior circle tempering is secondary, and temperature is 590~610 DEG C, soaking time 14h.Alloy billet is in copying into described half
It after finished product, is heat-treated, passes through quenching --- the Tempering and Quenching process of tempering --- quenching --- double tempering so that half
The mechanical property performance of finished product is excellent, such as tensile strength, yield strength, elongation after fracture, the contraction percentage of area and ballistic work ginseng
Number increases.
Preferably, the heating and thermal insulation of the step C1 includes：
The semi-finished product are put into well-type electric furnace by preheating step, and it is 430~470 DEG C to be first heated to furnace temperature, and keeps the temperature 2h；
It is 630~670 DEG C to be then heated to furnace temperature, and keeps the temperature 1h；
Incubation step, after the preheating step, it is 840~880 DEG C to be heated to furnace temperature, and keeps the temperature 14h；
It comes out of the stove step, the semi-finished product after the incubation step is come out of the stove, and the semi-finished product are rapidly moved to water base
Above quenching bath, traveling time≤60s.
Preferably, step C5 is further included：
Case hardness detection first is carried out to the semi-finished product, the surface for examining surface at least three point of the semi-finished product is hard
Degree verifies the case hardness of the semi-finished product；
Again the semi-finished product are carried out with mechanics properties testing, in universal tensile testing machine and impact examination after part of materialsing processing
It tests on machine and carries out tensile strength, yield strength, elongation after fracture, the contraction percentage of area and Charpy-V impact power detection.Default tension is strong
Degree, yield strength, elongation after fracture, the contraction percentage of area and Charpy-V impact power detection acceptance value, then to semi-finished product carry out with
Upper detection detects the mechanical property of semi-finished product, can optimize heat treatment process parameter in time according to testing result, avoid finished product in time
Quality is irregular.It also can be in time by subsequently increasing some heat treatment procedures come to its mechanics to detecting underproof semi-finished product
Performance optimizes.
Preferably, according to mass percent, the alloy billet includes following components：
C：0.32~0.38%,
Si：0.17~0.37%,
Mn：0.45~0.70%,
P：≤ 0.025%,
S：≤ 0.035%,
V：0.07~0.12%,
Cu：≤ 0.20%,
Cr：1.45~1.70%,
Mo：0.22~0.32%,
Ni：1.50~1.70%,
Nb：0.01~0.1%,
Surplus is Fe and inevitable impurity；
In its metal structure, ferritic volume fraction is 30~45%, and the volume fraction of bainite is 10~25%, is returned
The volume fraction of fiery martensite is 30~45%, and the volume fraction of austenite is 5~15% and the volume fraction of martensite is 5
~8%.
Using above-mentioned alloy billet, avoid density loose or the appearance of a large amount of shrinkage cavities, forged for the later stage, be thermally treated resulting in it is excellent
The opposite sex can provide basis；Existing safe locking pin uses rolled steel, and Post isothermal treatment is difficult to promote its mechanical property again.
Elements of the C as stable austenite at room temperature in the alloy billet, is to ensure that the remaining necessity of austenite
Element；The content of C has decisive role for the volume fraction of remaining martensite, therefore sets the content of C (according to quality percentage
Than) it is 0.32~0.38%, stability of the retained austenite in processing can be improved, while ensure the content of remaining martensite,
And avoid the excessively high damage caused to machining of C content and the reduction of solderability.
Mn contributes to C in austenite equally as austenite stabilizer element, while cementite can be prevented to generate
Enrichment；Therefore the content (according to mass percent) of setting Mn is 0.45~0.70%, caused by Mn resultants can be avoided too low
The volume fraction of remaining martensite is less and Mn too high levels caused by hardening to ferrite or bainite, and then avoid pair
The reduction of machinability and the reduction of toughness.
P does not dissolve in cementite in 350~600 DEG C of isothermals, so as to which cementite is inhibited to be precipitated within this temperature range；
Extremely strong solution strengthening ability is played simultaneously, improves solution strengthening effect.Therefore the content of setting P is (according to mass percent)
≤ 0.025%, the solid solution strengthening effect for not only improving P plays, and does not also have a negative impact, and steel body is avoided to generate cold brittleness.
The content of S is arranged on (according to mass percent) in the range of≤0.035%, can improve the machining of steel body
Property, it does not also have a negative impact, steel body is avoided to generate red brittleness.
The content of Cu is arranged on (according to mass percent) in the range of≤0.20%, can improve the intensity of steel body and tough
Property, it does not also have a negative impact, steel body is avoided to generate red brittleness.
The content of V is arranged on (according to mass percent) in the range of 0.07~0.12%, can thinning microstructure crystal grain, improve
The intensity and toughness of steel body, V and C form carbide, improve the hydrogen attack resistance of steel body at high temperature under high pressure.
Si helps to increase ferritic volume fraction, improves the machinability of steel body as ferrite stabilizer.
In addition, Si can prevent the formation of cementite, so as to which C be made effectively to be enriched in austenite, therefore the addition of Si combination C elements, it is right
In by austenite stabilization in an appropriate volume fraction being at room temperature required.
The content of Cr is arranged on (according to mass percent) in the range of 1.45~1.70%, and Cr and C forms a variety of carbonizations
Object slows down the decomposition rate of austenite, the intensity and the quenching degree in heat treatment for significantly improving steel body.
Mo is solid-solution in ferrite, austenite and carbide, reduces the element of austenite phase field, therefore the content of Mo
(according to mass percent) is arranged in the range of 0.22~0.32%, is reduced when being coexisted with Cr, Mn or is inhibited other element institutes
Caused temper brittleness.
The content of Ni is arranged on (according to mass percent) in the range of 1.50~1.70%, and Ni significantly improves the strong of steel body
Degree, and steel body is made to keep good plasticity and toughness.
The content of Nb is arranged on (according to mass percent) in the range of 0.01~0.1%, in the partial saturation stage,
Nb elements give full play to the inhibition grown to austenite grain, and crystal grain thinning while avoids a large amount of precipitates to remaining horse
The influence of family name's body stability reduces the superheated susceptivity and temper brittleness of steel body.
Preferably, step A6 is further included：
To treated that the alloy billet carries out metallographic examination by step A5, the segregation group of the alloy billet is checked
Knit vestiges and grain size：If the alloy billet does not have a mixed crystal presence, and most coarse-grain granularity is at 7 grades or more, then the alloy
Steel billet is by metallographic examination, if the alloy billet, not by metallographic examination, which cannot enter subsequent processing
Process.The grain size of the alloy billet is controlled at 7 grades or more, fine and closely woven uniform crystal grain so that the alloy billet is shown
The mechanical property come significantly improves.And common iron, grain size control is hardly done, grain size is typically lower 9,10
Grade or even worse, and coarse grain size can reduce the mechanical property of steel.
Preferably, following checkout procedure is further included in the copying of the step B：
Behind the rough turn outside of the alloy billet, ultrasonic examination inspection is carried out to the alloy billet by step B1；Step
B2 during rough turning and rough milling, controls each portion's scale error of the semi-finished product.To steel alloy in copying
Base carries out ultrasonic examination inspection, and the alloy billet of existing defects is avoided to enter subsequent processing link, improves final product quality.In advance
If each portion's dimensional tolerance of semi-finished product, each portion's scale error of semi-finished product is controlled to be improved into its correspondingly-sized margin of tolerance
Quality.The acceptance criteria of the ultrasonic examination inspection is《3 grades of GB/T6402-2008》.
Preferably, the step D is further included：
Step D1 carries out ultrasonic examination inspection to the semi-finished product after semifinishing；
Step D2 controls each portion's scale error of the semi-finished product in finishing passes；
Step D3 carries out magnetic particle testing to the semi-finished product after finishing.
The semi-finished product of existing defects is avoided to enter following process, preset each portion's dimensional tolerance of semi-finished product, control semi-finished product
Each portion's scale error in its correspondingly-sized margin of tolerance, the acceptance criteria of the ultrasonic examination inspection is《GB/T6402-
2008 3 grades》.The acceptance criteria of the magnetic particle testing is《GB/T15822.1-2005》.
Preferably, in the step A, chemical composition spectrum analysis first is carried out to the alloy billet of interception, then forged.
Chemical composition spectrum analysis is carried out by the alloy billet to interception, whether the various composition for detecting alloy billet is up to standard, avoids
Underproof alloy billet enters following process link, improves final product quality.
Preferably, front and rear Wen Sheng≤10 DEG C of the quenching.The front and rear temperature of quenching is avoided to rise too fast and influence releasing for stress
It puts and alloy billet is made to generate larger brittleness.
The manufacturing method of the low temperature heavy duty high-performance safe locking pin forges the alloy billet of interception, the side of forging
Alloy billet consistency height, good toughness and the steel fibre composition that formula obtains centainly uniformly flow to form, than rolled steel performance
It is more excellent, such as the comparison of rope and line.Increase diffusion annealing processing during forging, make all kinds of alloys member in alloy billet
Plain fully fusion, is effectively improved structural homogenity.The low temperature heavy duty high-performance safe locking pin obtained can be -10~-30
DEG C low temperature environment under 3000~8000 tons of load, the low temperature heavy duty high-performance safe locking pin excellent in mechanical performance is not easy
Fracture, effectively locks ship, service life is long.
The alloy billet is kept the temperature at 1200~1300 DEG C, ensures that all alloying elements are outstanding in the alloy billet
It is the abundant solid solution of Nb, and soaking time and morphology volume (mainly maximum cross section) have certain relationship, heat preservation 14~
15h is conducive to the abundant diffusion of alloying element, promotes the homogenization of alloying element, ultimately facilitates the homogenization of tissue.It is described
It forges and is pulled out for multiple pier, the number that forges is not particularly limited, effect is forged with can obtain predetermined deformation quantity.
Control pretreatment temperature opens forging, final forging temperature, can prevent due to forging front and rear excessive temperature differentials, bring stress it is big,
The ill effects such as micro-crack.The starting forging temperature of the rough forge is 1100~1200 DEG C, and the final forging temperature of the rough forge is >=1000
℃；It advantageously ensures that the temperature requirement of subsequent finish forge, avoids the weight for leading to the alloy billet due to temperature is too low after rough forge
Newly melt down heating.The heating temperature of the diffusion annealing is 1100~1200 DEG C, and keeps the temperature 14~15h；In the diffusion annealing
Heating temperature condition under, martensitic traoformation occurs for the alloy billet, while effectively improves the uniformity for forging steel billet tissue,
Make the crystal grain for forging steel billet fine and smooth uniformly, so as to improve banded structure is forged, and then reduce the crystallite dimension for forging recrystallization, make
It is more uniform tissue must to be forged.The diffusion annealing is completed by way of heating；There is no special want to the mode of the heating
It asks, using mode of heating well-known to those skilled in the art.The starting forging temperature of the finish forge is 1000~1100 DEG C, institute
The final forging temperature for stating finish forge is >=900 DEG C；Pro-eutectoid ferrite caused by avoiding final forging temperature too low and austenite are along processing
Direction extends, and forms ferrite and the alternatively distributed banded structure pattern of pearlite after completing transformation, otherwise banded structure has
Heredity, if forging, banded structure is serious, and austenite is preferentially in banded structure grain boundaries shape when forging rear continuous annealing heating
Into, and quickly grow up to pearlite, band-like martensite is formed in subsequent cooling procedure, leads to the elongation of the alloy billet
Rate declines.
Normalizing and temper are increased to the alloy billet after finish forge, is released effectively and forges stress, and is caused
Steel fibre after forging uniformly, chemical composition element fully fuse, improve the intensity of the alloy billet so that manufacture it is low
For warm heavy duty high-performance safe locking pin under low temperature high-impact, uniform force avoids moment overload impact from being broken ,-
Also there is preferable mechanical property under 10~-30 DEG C of low temperature environment, not cracky, improve the use reliability of safe locking pin,
Ship is effectively lockked, is prolonged the service life.
Description of the drawings
The present invention will be further described for attached drawing, but the content in attached drawing does not form any limitation of the invention.
Fig. 1 is the low temperature heavy duty high-performance safe locking pin preparation technology flow chart of the one of embodiment of the present invention.
Specific embodiment
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.
The each component and its mass percentage content of embodiment A1~A4 alloy billets, as shown in table 1, surplus is for Fe and not
Evitable impurity；
In the metal structure of embodiment A1~A4 alloy billets, ferritic volume fraction is 40%, the volume of bainite
Score is 15%, and the volume fraction of tempered martensite is 35%, and the volume fraction of austenite is 5% and the volume point of martensite
Number is 5%.
Table 1
As shown in Figure 1, embodiment A1~A4 prepares low temperature heavy duty high-performance safe locking pin according to following steps：
Step 1: interception ingredient alloy billet as shown in Table 1, first carries out chemical composition spectrum to the alloy billet of interception
Analysis, then forged：
(1.1) 1250 DEG C are heated to the alloy billet, and keep the temperature 14.5h；
(1.2) rough forge is carried out to the alloy billet, wherein the starting forging temperature of the rough forge is 1150 DEG C, the rough forge
Final forging temperature is 1100 DEG C；
(1.3) annealing is diffused to the alloy billet, wherein the heating temperature of the diffusion annealing is 1150
DEG C, and keep the temperature 14.5h；
(1.4) finish forge is carried out to the alloy billet, wherein the starting forging temperature of the finish forge is 1050 DEG C, the finish forge
Final forging temperature is 1000 DEG C；
(1.5) 880 DEG C are heated to the alloy billet normalizing after finish forge, keeps the temperature 14.5h；, then wind cooling temperature lowering
Temper is carried out after to less than 200 DEG C, the temperature is 680 DEG C, keeps the temperature 14h, then comes out of the stove and be air-cooled to room temperature；
(1.6) metallographic examination is carried out to the alloy billet, checks the segregation tissue vestiges and crystal grain of the alloy billet
Degree：If the alloy billet does not have mixed crystal presence, and most coarse-grain granularity at 7 grades or more, then the alloy billet passes through metallographic
It checks；
Step 2: carrying out copying to the alloy billet being cooled to room temperature, i.e., rough turning is carried out to the alloy billet
And rough milling, behind the rough turn outside of the alloy billet, ultrasonic examination inspection is carried out to the alloy billet, described in control
Each portion's scale error of semi-finished product, so as to obtain the semi-finished product of safe locking pin；
Step 3 is heat-treated the semi-finished product：
(3.1) heating and thermal insulation is carried out to the semi-finished product：
The semi-finished product are put into well-type electric furnace by preheating step, and it is 450 DEG C to be first heated to furnace temperature, and keeps the temperature 2h；Then plus
Heat to furnace temperature is 650 DEG C, and keeps the temperature 1h；
Incubation step, after the preheating step, it is 860 DEG C to be heated to furnace temperature, and keeps the temperature 14h；
It comes out of the stove step, the semi-finished product after the incubation step is come out of the stove, and the semi-finished product are rapidly moved to water base
Above quenching bath, traveling time 50s；
(3.2) semi-finished product after heating in water base quenching cycles pond are quenched, controls water base quenching cycles
Liquid temperature in pond is 40 DEG C, cool time 25min, controls front and rear Wen Sheng≤10 DEG C of quenching, the cooling temperature of the semi-finished product
≤ 150 DEG C of degree；
(3.3) the quenched semi-finished product are put into tempering furnace to be tempered, temperature is 600 DEG C, soaking time
For 14h；
(3.4) semi-finished product that tempering is come out of the stove are quenched again in water base quenching cycles pond, control is water base to quench
40 DEG C, cool time 25min of liquid temperature in fiery circulatory pool, controls front and rear Wen Sheng≤10 DEG C of quenching, the semi-finished product it is cold
But temperature≤150 DEG C；Then cycle temper tempering is secondary, and temperature is 600 DEG C, soaking time 14h；
(3.5) case hardness detection first is carried out to the semi-finished product, examines the table of surface at least three point of the semi-finished product
Surface hardness verifies the case hardness of the semi-finished product；
Again the semi-finished product are carried out with mechanics properties testing, in universal tensile testing machine and impact examination after part of materialsing processing
It tests on machine and carries out tensile strength, yield strength, elongation after fracture, the contraction percentage of area and Charpy-V impact power detection；
Step 4 carries out semifinishing and finishing, after semifinishing to the semi-finished product after Overheating Treatment
The semi-finished product carry out ultrasonic examination inspection, each portion's scale error of the semi-finished product are controlled in finishing passes, to essence
The semi-finished product after processing carry out magnetic particle testing, so as to obtain low temperature heavy duty high-performance safe locking pin, detection data
As shown in table 2.
Table 2
As shown in Table 2, the manufacturing method of the low temperature heavy duty high-performance safe locking pin is reliable and stable, the low temperature produced
Heavily loaded high-performance safe locking pin intensity is high, and be hit good toughness, and superiority is still maintained in storm, severe cold adverse circumstances
Can, the advantages that intensity is high, elongation percentage is big and impact flexibility is high is still maintained under low temperature environment (- 40 DEG C), tensile strength reaches
More than 1000MPa, elongation after fracture is between 12~20%, AKV (- 40 DEG C) >=40J, meets and has heavy duty and impact flexibility
The process components requirement of product.
Embodiment B1~B4 alloy billets are composed of the following components：C：0.34%th, Si：0.28%th, Mn：0.54%th, P：
0.007%th, S：0.004%th, V：0.09%th, Cu：0.03%th, Cr：1.55%th, Mo：0.28%th, Ni：1.58%th, Nb：0.02%,
Surplus is Fe and inevitable impurity；
In the metal structure of embodiment B1~B4 alloy billets, ferritic volume fraction is 40%, the volume of bainite
Score is 15%, and the volume fraction of tempered martensite is 35%, and the volume fraction of austenite is 5% and the volume point of martensite
Number is 5%.
Embodiment B1 prepares safe locking pin according to following steps：
Step 1: intercepting above-mentioned alloy billet, chemical composition spectrum analysis is carried out and to described to the alloy billet of interception
Alloy billet carries out metallographic examination, checks the segregation tissue vestiges and grain size of the alloy billet：If the alloy billet does not have
With the presence of mixed crystal, and most coarse-grain granularity at 7 grades or more, then the alloy billet passes through metallographic examination；
Step 2: carrying out copying to alloy billet, i.e., rough turning and rough milling are carried out to the alloy billet,
Behind the rough turn outside of alloy billet, ultrasonic examination inspection is carried out to the alloy billet, controls each portion of the semi-finished product
Scale error, so as to obtain the semi-finished product of safe locking pin；
Step 3 is heat-treated the semi-finished product：
(3.1) heating and thermal insulation is carried out to the semi-finished product：
The semi-finished product are put into well-type electric furnace by preheating step, and it is 450 DEG C to be first heated to furnace temperature, and keeps the temperature 2h；Then plus
Heat to furnace temperature is 650 DEG C, and keeps the temperature 1h；
Incubation step, after the preheating step, it is 860 DEG C to be heated to furnace temperature, and keeps the temperature 14h；
It comes out of the stove step, the semi-finished product after the incubation step is come out of the stove, and the semi-finished product are rapidly moved to water base
Above quenching bath, traveling time 50s；
(3.2) semi-finished product after heating in water base quenching cycles pond are quenched, controls water base quenching cycles
Liquid temperature in pond is 40 DEG C, cool time 25min, controls front and rear Wen Sheng≤10 DEG C of quenching, the cooling temperature of the semi-finished product
≤ 150 DEG C of degree；
(3.3) the quenched semi-finished product are put into tempering furnace to be tempered, temperature is 600 DEG C, soaking time
For 14h；
(3.4) semi-finished product that tempering is come out of the stove are quenched again in water base quenching cycles pond, control is water base to quench
40 DEG C, cool time 25min of liquid temperature in fiery circulatory pool, controls front and rear Wen Sheng≤10 DEG C of quenching, the semi-finished product it is cold
But temperature≤150 DEG C；Then cycle temper tempering is secondary, and temperature is 600 DEG C, soaking time 14h；
(3.5) case hardness detection first is carried out to the semi-finished product, examines the table of surface at least three point of the semi-finished product
Surface hardness verifies the case hardness of the semi-finished product；
Again the semi-finished product are carried out with mechanics properties testing, in universal tensile testing machine and impact examination after part of materialsing processing
It tests on machine and carries out tensile strength, yield strength, elongation after fracture, the contraction percentage of area and Charpy-V impact power detection；
Step 4 carries out semifinishing and finishing, after semifinishing to the semi-finished product after Overheating Treatment
The semi-finished product carry out ultrasonic examination inspection, each portion's scale error of the semi-finished product are controlled in finishing passes, to essence
The semi-finished product after processing carry out magnetic particle testing, and so as to obtain safe locking pin, detection data is as shown in table 3.
Embodiment B2 prepares safe locking pin according to following steps：
Step 1: intercepting above-mentioned alloy billet, chemical composition spectrum analysis first is carried out to the alloy billet of interception, then carry out
It forges：
(1.1) 1250 DEG C are heated to the alloy billet, and keep the temperature 14.5h；
(1.2) rough forge is carried out to the alloy billet, wherein the starting forging temperature of the rough forge is 1150 DEG C, the rough forge
Final forging temperature is 1100 DEG C；
(1.3) annealing is diffused to the alloy billet, wherein the heating temperature of the diffusion annealing is 1150
DEG C, and keep the temperature 14.5h；
(1.4) finish forge is carried out to the alloy billet, wherein the starting forging temperature of the finish forge is 1050 DEG C, the finish forge
Final forging temperature is 1000 DEG C；
(1.5) metallographic examination is carried out to the alloy billet, checks the segregation tissue vestiges and crystal grain of the alloy billet
Degree：If the alloy billet does not have mixed crystal presence, and most coarse-grain granularity at 7 grades or more, then the alloy billet passes through metallographic
It checks；
Step 2: carrying out copying to the alloy billet being cooled to room temperature, i.e., rough turning is carried out to the alloy billet
And rough milling, behind the rough turn outside of the alloy billet, ultrasonic examination inspection is carried out to the alloy billet, described in control
Each portion's scale error of semi-finished product, so as to obtain the semi-finished product of safe locking pin；
Step 3 is heat-treated the semi-finished product：
(3.1) heating and thermal insulation is carried out to the semi-finished product：
The semi-finished product are put into well-type electric furnace by preheating step, and it is 450 DEG C to be first heated to furnace temperature, and keeps the temperature 2h；Then plus
Heat to furnace temperature is 650 DEG C, and keeps the temperature 1h；
Incubation step, after the preheating step, it is 860 DEG C to be heated to furnace temperature, and keeps the temperature 14h；
It comes out of the stove step, the semi-finished product after the incubation step is come out of the stove, and the semi-finished product are rapidly moved to water base
Above quenching bath, traveling time 50s；
(3.2) semi-finished product after heating in water base quenching cycles pond are quenched, controls water base quenching cycles
Liquid temperature in pond is 40 DEG C, cool time 25min, controls front and rear Wen Sheng≤10 DEG C of quenching, the cooling temperature of the semi-finished product
≤ 150 DEG C of degree；
(3.3) the quenched semi-finished product are put into tempering furnace to be tempered, temperature is 600 DEG C, soaking time
For 14h；
(3.4) semi-finished product that tempering is come out of the stove are quenched again in water base quenching cycles pond, control is water base to quench
40 DEG C, cool time 25min of liquid temperature in fiery circulatory pool, controls front and rear Wen Sheng≤10 DEG C of quenching, the semi-finished product it is cold
But temperature≤150 DEG C；Then cycle temper tempering is secondary, and temperature is 600 DEG C, soaking time 14h；
(3.5) case hardness detection first is carried out to the semi-finished product, examines the table of surface at least three point of the semi-finished product
Surface hardness verifies the case hardness of the semi-finished product；
Again the semi-finished product are carried out with mechanics properties testing, in universal tensile testing machine and impact examination after part of materialsing processing
It tests on machine and carries out tensile strength, yield strength, elongation after fracture, the contraction percentage of area and Charpy-V impact power detection；
Step 4 carries out semifinishing and finishing, after semifinishing to the semi-finished product after Overheating Treatment
The semi-finished product carry out ultrasonic examination inspection, each portion's scale error of the semi-finished product are controlled in finishing passes, to essence
The semi-finished product after processing carry out magnetic particle testing, and so as to obtain safe locking pin, detection data is as shown in table 3.
Embodiment B3 prepares safe locking pin according to following steps：
Step 1: intercepting above-mentioned alloy billet, chemical composition spectrum analysis first is carried out to the alloy billet of interception, then carry out
It forges：
(1.1) 1250 DEG C are heated to the alloy billet, and keep the temperature 14.5h；
(1.2) rough forge is carried out to the alloy billet, wherein the starting forging temperature of the rough forge is 1150 DEG C, the rough forge
Final forging temperature is 1100 DEG C；
(1.3) annealing is diffused to the alloy billet, wherein the heating temperature of the diffusion annealing is 1150
DEG C, and keep the temperature 14.5h；
(1.4) finish forge is carried out to the alloy billet, wherein the starting forging temperature of the finish forge is 1050 DEG C, the finish forge
Final forging temperature is 1000 DEG C；
(1.5) 880 DEG C are heated to the alloy billet normalizing after finish forge, keeps the temperature 14.5h；, then wind cooling temperature lowering
Temper is carried out after to less than 200 DEG C, the temperature is 680 DEG C, keeps the temperature 14h, then comes out of the stove and be air-cooled to room temperature；
(1.6) metallographic examination is carried out to the alloy billet, checks the segregation tissue vestiges and crystal grain of the alloy billet
Degree：If the alloy billet does not have mixed crystal presence, and most coarse-grain granularity at 7 grades or more, then the alloy billet passes through metallographic
It checks；
Step 2: carrying out copying to the alloy billet being cooled to room temperature, i.e., rough turning is carried out to the alloy billet
And rough milling, behind the rough turn outside of the alloy billet, ultrasonic examination inspection is carried out to the alloy billet, described in control
Each portion's scale error of semi-finished product, so as to obtain the semi-finished product of safe locking pin；
Step 3 carries out semifinishing and finishing to the semi-finished product, the semi-finished product after semifinishing is carried out
Ultrasonic examination inspection controls each portion's scale error of the semi-finished product in finishing passes, to described half after finishing
Finished product carries out magnetic particle testing, and so as to obtain safe locking pin, detection data is as shown in table 3.
Embodiment B4 prepares safe locking pin according to following steps：
Step 1: intercepting above-mentioned alloy billet, chemical composition spectrum analysis first is carried out to the alloy billet of interception, then carry out
It forges：
(1.1) 1250 DEG C are heated to the alloy billet, and keep the temperature 14.5h；
(1.2) rough forge is carried out to the alloy billet, wherein the starting forging temperature of the rough forge is 1150 DEG C, the rough forge
Final forging temperature is 1100 DEG C；
(1.3) annealing is diffused to the alloy billet, wherein the heating temperature of the diffusion annealing is 1150
DEG C, and keep the temperature 14.5h；
(1.4) finish forge is carried out to the alloy billet, wherein the starting forging temperature of the finish forge is 1050 DEG C, the finish forge
Final forging temperature is 1000 DEG C；
(1.5) 880 DEG C are heated to the alloy billet normalizing after finish forge, keeps the temperature 14.5h；, then wind cooling temperature lowering
Temper is carried out after to less than 200 DEG C, the temperature is 680 DEG C, keeps the temperature 14h, then comes out of the stove and be air-cooled to room temperature；
Step 2: carrying out copying to the alloy billet being cooled to room temperature, i.e., rough turning is carried out to the alloy billet
And rough milling, behind the rough turn outside of the alloy billet, ultrasonic examination inspection is carried out to the alloy billet, described in control
Each portion's scale error of semi-finished product, so as to obtain the semi-finished product of safe locking pin；
Step 3 is heat-treated the semi-finished product：
(3.1) heating and thermal insulation is carried out to the semi-finished product：
The semi-finished product are put into well-type electric furnace by preheating step, and it is 450 DEG C to be first heated to furnace temperature, and keeps the temperature 2h；Then plus
Heat to furnace temperature is 650 DEG C, and keeps the temperature 1h；
Incubation step, after the preheating step, it is 860 DEG C to be heated to furnace temperature, and keeps the temperature 14h；
It comes out of the stove step, the semi-finished product after the incubation step is come out of the stove, and the semi-finished product are rapidly moved to water base
Above quenching bath, traveling time 50s；
(3.2) semi-finished product after heating in water base quenching cycles pond are quenched, controls water base quenching cycles
Liquid temperature in pond is 40 DEG C, cool time 25min, controls front and rear Wen Sheng≤10 DEG C of quenching, the cooling temperature of the semi-finished product
≤ 150 DEG C of degree；
(3.3) the quenched semi-finished product are put into tempering furnace to be tempered, temperature is 600 DEG C, soaking time
For 14h；
(3.4) semi-finished product that tempering is come out of the stove are quenched again in water base quenching cycles pond, control is water base to quench
40 DEG C, cool time 25min of liquid temperature in fiery circulatory pool, controls front and rear Wen Sheng≤10 DEG C of quenching, the semi-finished product it is cold
But temperature≤150 DEG C；Then cycle temper tempering is secondary, and temperature is 600 DEG C, soaking time 14h；
(3.5) case hardness detection first is carried out to the semi-finished product, examines the table of surface at least three point of the semi-finished product
Surface hardness verifies the case hardness of the semi-finished product；
Again the semi-finished product are carried out with mechanics properties testing, in universal tensile testing machine and impact examination after part of materialsing processing
It tests on machine and carries out tensile strength, yield strength, elongation after fracture, the contraction percentage of area and Charpy-V impact power detection；
Step 4 carries out semifinishing and finishing, after semifinishing to the semi-finished product after Overheating Treatment
The semi-finished product carry out ultrasonic examination inspection, each portion's scale error of the semi-finished product are controlled in finishing passes, to essence
The semi-finished product after processing carry out magnetic particle testing, and so as to obtain safe locking pin, detection data is as shown in table 3.
Embodiment C1 prepares safe locking pin according to following steps：
Step 1: intercepting existing rolling steel billet, copying is carried out, i.e., rough turning is carried out to existing rolling steel billet and is rough milled
Processing behind the rough turn outside of existing rolling steel billet, carries out ultrasonic examination inspection to existing rolling steel billet, controls the semi-finished product
Each portion's scale error, so as to obtain the semi-finished product of safe locking pin；
Step 2 carries out semifinishing and finishing to the semi-finished product, the semi-finished product after semifinishing is carried out
Ultrasonic examination inspection controls each portion's scale error of the semi-finished product in finishing passes, to described half after finishing
Finished product carries out magnetic particle testing, and so as to obtain safe locking pin, detection data is as shown in table 3.
Embodiment C2 prepares safe locking pin according to following steps：
Step 1: intercepting existing rolling steel billet, chemical composition spectrum analysis first is carried out to the existing rolling steel billet of interception；
Step 2: carrying out copying to existing rolling steel billet, i.e., carry out rough turning to existing rolling steel billet and rough mill to add
Work behind the rough turn outside of existing rolling steel billet, carries out ultrasonic examination inspection to existing rolling steel billet, controls the semi-finished product
Each portion's scale error, so as to obtain the semi-finished product of safe locking pin；
Step 3 is heat-treated the semi-finished product：
(3.1) heating and thermal insulation is carried out to the semi-finished product：
The semi-finished product are put into well-type electric furnace by preheating step, and it is 450 DEG C to be first heated to furnace temperature, and keeps the temperature 2h；Then plus
Heat to furnace temperature is 650 DEG C, and keeps the temperature 1h；
Incubation step, after the preheating step, it is 860 DEG C to be heated to furnace temperature, and keeps the temperature 14h；
It comes out of the stove step, the semi-finished product after the incubation step is come out of the stove, and the semi-finished product are rapidly moved to water base
Above quenching bath, traveling time 50s；
(3.2) semi-finished product after heating in water base quenching cycles pond are quenched, controls water base quenching cycles
Liquid temperature in pond is 40 DEG C, cool time 25min, controls front and rear Wen Sheng≤10 DEG C of quenching, the cooling temperature of the semi-finished product
≤ 150 DEG C of degree；
(3.3) the quenched semi-finished product are put into tempering furnace to be tempered, temperature is 600 DEG C, soaking time
For 14h；
(3.4) semi-finished product that tempering is come out of the stove are quenched again in water base quenching cycles pond, control is water base to quench
40 DEG C, cool time 25min of liquid temperature in fiery circulatory pool, controls front and rear Wen Sheng≤10 DEG C of quenching, the semi-finished product it is cold
But temperature≤150 DEG C；Then cycle temper tempering is secondary, and temperature is 600 DEG C, soaking time 14h；
(3.5) case hardness detection first is carried out to the semi-finished product, examines the table of surface at least three point of the semi-finished product
Surface hardness verifies the case hardness of the semi-finished product；
Again the semi-finished product are carried out with mechanics properties testing, in universal tensile testing machine and impact examination after part of materialsing processing
It tests on machine and carries out tensile strength, yield strength, elongation after fracture, the contraction percentage of area and Charpy-V impact power detection；
Step 4 carries out semifinishing and finishing, after semifinishing to the semi-finished product after Overheating Treatment
The semi-finished product carry out ultrasonic examination inspection, each portion's scale error of the semi-finished product are controlled in finishing passes, to essence
The semi-finished product after processing carry out magnetic particle testing, and so as to obtain safe locking pin, detection data is as shown in table 3.
Embodiment C3 prepares safe locking pin according to following steps：
Step 1: intercepting existing rolling steel billet, chemical composition spectrum analysis is first carried out to the existing rolling steel billet of interception, then
It is forged：
(1.1) 1250 DEG C are heated to existing rolling steel billet, and keep the temperature 14.5h；
(1.2) rough forge is carried out to existing rolling steel billet, wherein the starting forging temperature of the rough forge is 1150 DEG C, the rough forge
Final forging temperature is 1100 DEG C；
(1.3) annealing is diffused to existing rolling steel billet, wherein the heating temperature of the diffusion annealing is 1150
DEG C, and keep the temperature 14.5h；
(1.4) finish forge is carried out to existing rolling steel billet, wherein the starting forging temperature of the finish forge is 1050 DEG C, the finish forge
Final forging temperature is 1000 DEG C；
(1.5) 880 DEG C are heated to the existing rolling steel billet normalizing after finish forge, keeps the temperature 14.5h；, then wind cooling temperature lowering
Temper is carried out after to less than 200 DEG C, the temperature is 680 DEG C, keeps the temperature 14.5h, then comes out of the stove and be air-cooled to room temperature；
(1.6) metallographic examination is carried out to existing rolling steel billet, checks the segregation tissue vestiges and crystal grain of the alloy billet
Degree：If the alloy billet does not have mixed crystal presence, and most coarse-grain granularity at 7 grades or more, then existing rolling steel billet passes through metallographic
It checks；
Step 2: carrying out copying to the existing rolling steel billet being cooled to room temperature, i.e., existing rolling steel billet is carried out thick
Turning and rough milling behind the rough turn outside of existing rolling steel billet, carry out existing rolling steel billet ultrasonic examination inspection, control
Each portion's scale error of the semi-finished product, so as to obtain the semi-finished product of safe locking pin；
Step 3 is heat-treated the semi-finished product：
(3.1) heating and thermal insulation is carried out to the semi-finished product：
The semi-finished product are put into well-type electric furnace by preheating step, and it is 450 DEG C to be first heated to furnace temperature, and keeps the temperature 2h；Then plus
Heat to furnace temperature is 650 DEG C, and keeps the temperature 1h；
Incubation step, after the preheating step, it is 860 DEG C to be heated to furnace temperature, and keeps the temperature 14h；
It comes out of the stove step, the semi-finished product after the incubation step is come out of the stove, and the semi-finished product are rapidly moved to water base
Above quenching bath, traveling time 50s；
(3.2) semi-finished product after heating in water base quenching cycles pond are quenched, controls water base quenching cycles
Liquid temperature in pond is 40 DEG C, cool time 25min, controls front and rear Wen Sheng≤10 DEG C of quenching, the cooling temperature of the semi-finished product
≤ 150 DEG C of degree；
(3.3) the quenched semi-finished product are put into tempering furnace to be tempered, temperature is 600 DEG C, soaking time
For 14h；
(3.4) semi-finished product that tempering is come out of the stove are quenched again in water base quenching cycles pond, control is water base to quench
40 DEG C, cool time 25min of liquid temperature in fiery circulatory pool, controls front and rear Wen Sheng≤10 DEG C of quenching, the semi-finished product it is cold
But temperature≤150 DEG C；Then cycle temper tempering is secondary, and temperature is 600 DEG C, soaking time 14h；
(3.5) case hardness detection first is carried out to the semi-finished product, examines the table of surface at least three point of the semi-finished product
Surface hardness verifies the case hardness of the semi-finished product；
Again the semi-finished product are carried out with mechanics properties testing, in universal tensile testing machine and impact examination after part of materialsing processing
It tests on machine and carries out tensile strength, yield strength, elongation after fracture, the contraction percentage of area and Charpy-V impact power detection；
Step 4 carries out semifinishing and finishing, after semifinishing to the semi-finished product after Overheating Treatment
The semi-finished product carry out ultrasonic examination inspection, each portion's scale error of the semi-finished product are controlled in finishing passes, to essence
The semi-finished product after processing carry out magnetic particle testing, and so as to obtain safe locking pin, detection data is as shown in table 3.
Table 3
As shown in Table 3, by embodiment A1~A4 and embodiment B1 comparisons it is found that the alloy billet consistency by forging
High, good toughness and steel fibre, which form, centainly uniformly flows to form, moment overload impact is avoided to be broken, at -10~-30 DEG C
Low temperature environment under also have preferable mechanical property, not cracky improves the intensity of safe locking pin；
By embodiment A1~A4 and embodiment B2 comparisons it is found that increasing normalizing to the alloy billet after finish forge
And temper, be released effectively and forge stress, and cause forge after steel fibre uniformly, chemical composition element fully fuse,
Improve the intensity of the alloy billet so that the low temperature heavy duty high-performance safe locking pin of manufacture under low temperature high-impact, by
Power is uniform；
By embodiment A1~A4 and embodiment B3 comparisons it is found that alloy billet is after the copying into semi-finished product,
It is heat-treated, passes through quenching --- the Tempering and Quenching process of tempering --- quenching --- double tempering so that semi-finished product
Mechanical property performance is excellent, such as tensile strength, yield strength, elongation after fracture, the contraction percentage of area and ballistic work parameter have
It is improved；
By embodiment A1~A4 and embodiment B4 comparisons it is found that controlling the grain size of the alloy billet at 7 grades or more,
Fine and closely woven uniform crystal grain so that the mechanical property that the alloy billet shows significantly improves, and coarse grain size can reduce
The mechanical property of steel；
By embodiment A1~A4 and embodiment C1~C3 comparisons it is found that existing rolling steel billet density is loose, exist a large amount of
Shrinkage cavity, even if the later stage, by forging and being heat-treated, every mechanical property is nor highly desirable, in low temperature environment -10~30 DEG C,
The mechanical property of existing rolling steel billet just substantially reduces, and generates brittleness, cracky.
The technical principle of the present invention is described above in association with specific embodiment.These descriptions are intended merely to explain the present invention's
Principle, and it cannot be construed to limiting the scope of the invention in any way.Based on explanation herein, the technology of this field
Personnel would not require any inventive effort the other specific embodiments that can associate the present invention, these modes are fallen within
Within protection scope of the present invention.
Claims (10)
1. a kind of manufacturing method of low temperature heavy duty high-performance safe locking pin, which is characterized in that include the following steps：
Step A intercepts alloy billet, and the alloy billet of interception is forged：
Step A1 is heated to the alloy billet 1200~1300 DEG C, and keeps the temperature 14~15h；
Step A2 carries out rough forge, wherein the starting forging temperature of the rough forge is to the alloy billet after heating and thermal insulation
1100~1200 DEG C, the final forging temperature of the rough forge is >=1000 DEG C；
Step A3 is diffused annealing, wherein the heating of the diffusion annealing to the alloy billet after rough forge
Temperature is 1100~1200 DEG C, and keeps the temperature 14~15h；
Step A4 carries out finish forge, wherein the starting forging temperature of the finish forge is to the alloy billet after diffusion annealing
1000~1100 DEG C, the final forging temperature of the finish forge is >=900 DEG C；
Step A5 is heated to the alloy billet normalizing after finish forge 880 DEG C, keeps the temperature 14~15h；, then wind cooling temperature lowering
Temper is carried out after to less than 200 DEG C, the temperature is 680 DEG C, keeps the temperature 14h, then comes out of the stove and be air-cooled to room temperature；
Step B, copying is carried out to the alloy billet being cooled to room temperature, i.e., rough turning is carried out to the alloy billet and is rough milled
Processing, so as to obtain the semi-finished product of safe locking pin；
Step C is heat-treated the semi-finished product；
Step D carries out semifinishing and finishing to the semi-finished product after Overheating Treatment, so as to obtain the high property of low temperature heavy duty
It can safe locking pin.
2. the manufacturing method of low temperature heavy duty high-performance safe locking pin according to claim 1, which is characterized in that the step
Rapid C includes following sub-step：
Step C1 carries out heating and thermal insulation to the semi-finished product；
The semi-finished product after heating in water base quenching cycles pond are quenched, control water base quenching cycles pond by step C2
In liquid temperature for 30~55 DEG C, the cool time is 25~30min, cooling temperature≤150 DEG C of the semi-finished product；
The quenched semi-finished product are put into tempering furnace and are tempered by step C3, and temperature is 590~610 DEG C, during heat preservation
Between be 14h；
The semi-finished product that tempering is come out of the stove in water base quenching cycles pond are quenched, control water base quenching by step C4 again
30~55 DEG C of liquid temperature in circulatory pool, the cool time be 25~30min, cooling temperature≤150 DEG C of the semi-finished product；Then it follows
Loopback fire is secondary, and temperature is 590~610 DEG C, soaking time 14h.
3. the manufacturing method of low temperature heavy duty high-performance safe locking pin according to claim 2, which is characterized in that the step
The heating and thermal insulation of rapid C1 includes：
The semi-finished product are put into well-type electric furnace by preheating step, and it is 430~470 DEG C to be first heated to furnace temperature, and keeps the temperature 2h；Then
It is 630~670 DEG C to be heated to furnace temperature, and keeps the temperature 1h；
Incubation step, after the preheating step, it is 840~880 DEG C to be heated to furnace temperature, and keeps the temperature 14h；
It comes out of the stove step, the semi-finished product after the incubation step is come out of the stove, and the semi-finished product are rapidly moved to water base quenching
Above pond, traveling time≤60s.
4. the manufacturing method of low temperature heavy duty high-performance safe locking pin according to claim 2, which is characterized in that further include
Step C5：
Case hardness detection first is carried out to the semi-finished product, the case hardness of surface at least three point of the semi-finished product is examined, tests
Demonstrate,prove the case hardness of the semi-finished product；
Again the semi-finished product are carried out with mechanics properties testing, in universal tensile testing machine and shock machine after part of materialsing processing
Upper progress tensile strength, yield strength, elongation after fracture, the contraction percentage of area and Charpy-V impact power detection.
5. the manufacturing method of low temperature heavy duty high-performance safe locking pin according to claim 1, which is characterized in that according to matter
Percentage is measured, the alloy billet includes following components：
C：0.32~0.38%,
Si：0.17~0.37%,
Mn：0.45~0.70%,
P：≤ 0.025%,
S：≤ 0.035%,
V：0.07~0.12%,
Cu：≤ 0.20%,
Cr：1.45~1.70%,
Mo：0.22~0.32%,
Ni：1.50~1.70%,
Nb：0.01~0.1%,
Surplus is Fe and inevitable impurity；
In its metal structure, ferritic volume fraction is 30~45%, and the volume fraction of bainite is 10~25%, is tempered horse
The volume fraction of family name's body is 30~45%, the volume fraction of austenite be 5~15% and the volume fraction of martensite be 5~
8%.
6. the manufacturing method of low temperature heavy duty high-performance safe locking pin according to claim 1, which is characterized in that further include
Step A6：
To treated that the alloy billet carries out metallographic examination by step A5, check that the segregation tissue of the alloy billet is residual
Mark and grain size：If the alloy billet does not have a mixed crystal presence, and most coarse-grain granularity is at 7 grades or more, then the alloy billet
Pass through metallographic examination.
7. the manufacturing method of low temperature heavy duty high-performance safe locking pin according to claim 1, which is characterized in that the step
Following checkout procedure is further included in the copying of rapid B：
Behind the rough turn outside of the alloy billet, ultrasonic examination inspection is carried out to the alloy billet by step B1；
Step B2 during rough turning and rough milling tooth copying, controls each portion's scale error of the semi-finished product.
8. the manufacturing method of low temperature heavy duty high-performance safe locking pin according to claim 1, which is characterized in that the step
Rapid D is further included：
Step D1 carries out ultrasonic examination inspection to the semi-finished product after semifinishing；
Step D2 controls each portion's scale error of the semi-finished product in finishing passes；
Step D3 carries out magnetic particle testing to the semi-finished product after finishing.
9. the manufacturing method of low temperature heavy duty high-performance safe locking pin according to claim 1, it is characterised in that：The step
In rapid A, chemical composition spectrum analysis first is carried out to the alloy billet of interception, then forged.
10. the manufacturing method of low temperature heavy duty high-performance safe locking pin according to claim 2, it is characterised in that：It is described
Front and rear Wen Sheng≤10 DEG C of quenching.
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Cited By (1)
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