CN108247284B - 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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- CN108247284B CN108247284B CN201711260445.3A CN201711260445A CN108247284B CN 108247284 B CN108247284 B CN 108247284B CN 201711260445 A CN201711260445 A CN 201711260445A CN 108247284 B CN108247284 B CN 108247284B
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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
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 50
- 239000010959 steel Substances 0.000 claims abstract description 50
- 238000005242 forging Methods 0.000 claims abstract description 48
- 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 61
- 238000005496 tempering Methods 0.000 claims description 60
- 230000000171 quenching effect Effects 0.000 claims description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- 238000010438 heat treatment Methods 0.000 claims description 38
- 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
- 238000000034 method Methods 0.000 claims description 14
- 229910000734 martensite Inorganic materials 0.000 claims description 13
- 238000009413 insulation 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
- 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
- 239000000835 fiber Substances 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000005096 rolling process Methods 0.000 description 25
- 238000003801 milling Methods 0.000 description 8
- 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
- 239000006104 solid 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
- 238000005516 engineering process Methods 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
- 239000000243 solution Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 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
- 244000131316 Panax pseudoginseng Species 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
- 230000007423 decrease Effects 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
- 238000012423 maintenance Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 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
- 238000007670 refining Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000001228 spectrum 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 forges to the alloy billet of interception；Step B carries out copying to the alloy billet being cooled to room temperature, i.e., carries out rough turning to alloy billet and rough mill tooth copying, 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 to the semi-finished product after Overheating Treatment, to obtain low temperature heavy duty high-performance safe locking pin.The alloy billet of interception is forged, alloy billet consistency height, good toughness and the steel fibre composition that the mode of forging obtains centainly uniformly flow to form；It after copying is at the semi-finished product, is heat-treated, so that the mechanical property of semi-finished product is excellent in, 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 technique
Lifting device is the key component of self-lifting type marine drilling platform, act on for allow 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 usually increases in jacking system and pacifies at any time by distinguished and admirable, ocean current impact and load effect of drifting along
Full locking pin locks spud leg, to prevent under non-lift operating condition 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 want
It is chronically at severe maritime environment, therefore critical component of the safe locking pin as lifting device, manufacturing process requires high.
But existing safe locking pin manufacturing method is easy to appear that density is loose or a large amount of contractings first is that using rolled steel
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, and replacement safe locking pin needs high maintenance cost；Third is that existing safety
Locking pin is easily broken off under the environment of low temperature heavy duty, and there are great security risks.
Summary of the invention
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 producing
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.
To achieve this purpose, the present invention adopts the following technical scheme:
A kind of manufacturing method of low temperature heavy duty high-performance safe locking pin, comprising the following steps:
Step A intercepts alloy billet, and forges to the alloy billet of interception:
Step A1 is heated to 1200~1300 DEG C to the alloy billet, and keeps the temperature 14~15h；
Step A2 carries out rough forge to the alloy billet after heating and thermal insulation, wherein the starting forging temperature of the rough forge
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 to the alloy billet after diffusion annealing, wherein the starting forging temperature of the finish forge
It is 1000~1100 DEG C, the final forging temperature of the finish forge is >=900 DEG C；
Step A5 is heated to 880 DEG C to the alloy billet normalizing after finish forge, keeps the temperature 14~15h；, then it is air-cooled
Tempering is carried out after being cooled to 200 DEG C or less, the tempering 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., to the alloy billet carry out rough turning and
Rough milling, 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, to obtain low temperature heavy duty
High-performance safe locking pin.
Preferably, further include step E, the parameters of the low temperature heavy duty high-performance safe locking pin are examined, if every
Parameter is qualified can be then packed and stored.
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, controls water base quenching and follows
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 tempering temperature is 590~610 DEG C, are 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, controls water base
30~55 DEG C of liquid temperature in quenching cycles pond, cool time are 25~30min, cooling temperature≤150 DEG C of the semi-finished product；So
Cycle temper tempering is secondary afterwards, and tempering temperature is 590~610 DEG C, soaking time 14h.Alloy billet is in copying at 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 of finished product is excellent in, 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 being first heated to furnace temperature is 430~470 DEG C, and keeps the temperature 2h；
Being then heated to furnace temperature is 630~670 DEG C, and keeps the temperature 1h；
Incubation step, after the preheating step, being heated to furnace temperature is 840~880 DEG C, 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, further include step C5:
Surface hardness detection first is carried out to the semi-finished product, examines the surface of surface at least three point of the semi-finished product hard
Degree, verifies the surface hardness of the semi-finished product；
Mechanics properties testing is carried out to the semi-finished product again, 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 in time, can optimize heat treatment process parameter in time according to testing result, avoid finished product
Quality is irregular.Also it can increase some heat treatment procedures by subsequent in time to underproof semi-finished product are detected come to its mechanics
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, forge for the later period, be heat-treated obtain 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.
Element 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 the content of C is arranged (according to quality percentage
Than) it is 0.32~0.38%, stability of the retained austenite in processing can be improved, while ensuring the content of remaining martensite,
And avoid the excessively high damage caused to machining of C content and the reduction of solderability.
Mn is equally used as austenite stabilizer element, while cementite can be prevented to generate, and facilitates C in austenite
Enrichment；Therefore the content (according to mass percent) of setting Mn is 0.45~0.70%, and it is too low caused to can be avoided Mn resultant
Hardening caused by the volume fraction of remaining martensite is less and Mn too high levels 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 inhibit cementite to be precipitated within this temperature range；
Extremely strong solution strengthening ability is played simultaneously, improves solution strengthening effect.Therefore the content (according to mass percent) of setting P is
≤ 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 (according to mass percent) of S is arranged 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 (according to mass percent) of Cu is arranged in the range of≤0.20%, and the intensity of steel body and tough can be improved
Property, it does not also have a negative impact, steel body is avoided to generate red brittleness.
The content (according to mass percent) of V is arranged 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 that it is enriched in C effectively in austenite, therefore the addition of Si combination C element, it is right
It is required at room temperature stablizing austenite in a volume fraction appropriate.
The content (according to mass percent) of Cr is arranged in the range of 1.45~1.70%, and Cr and C form a variety of carbonizations
Object slows down the decomposition rate of austenite, the intensity and the harden ability in heat treatment for significantly improving steel body.
Mo is solid-solution in ferrite, austenite and carbide, and the element of austenite phase field, therefore the content of Mo are reduced
(according to mass percent) is arranged in the range of 0.22~0.32%, and other element institutes are reduced or inhibited when coexisting with Cr, Mn
Caused temper brittleness.
The content (according to mass percent) of Ni is arranged 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 (according to mass percent) of Nb is arranged in the range of 0.01~0.1%, in the partial saturation stage,
Nb element gives full play to the inhibition to austenite grain growth, avoids a large amount of precipitates to remaining horse while refining crystal grain
The influence of family name's body stability reduces the superheated susceptivity and temper brittleness of steel body.
Preferably, further include step A6:
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 does not pass through metallographic examination, which not can 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 usually in lower 9,10
Grade or even worse, and coarse grain size can reduce the mechanical property of steel.
Preferably, further include following checkout procedure in the copying of the step B:
Step B1 carries out ultrasonic examination inspection to the alloy billet behind the rough turn outside of the alloy billet；Step
B2 controls each portion's scale error of the semi-finished product during rough turning and rough milling.To steel alloy in copying
Base carries out ultrasonic examination inspection, avoids the alloy billet of existing defects from entering subsequent processing link, improves final product quality.In advance
If each portion's dimensional tolerance of semi-finished product, control each portion's scale error of semi-finished product in its correspondingly-sized margin of tolerance, improve at
Quality.The acceptance criteria of the ultrasonic examination inspection is " 3 grades of GB/T6402-2008 ".
Preferably, the step D further include:
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.
It avoids the semi-finished product of existing defects from entering following process, presets 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 component spectrum analysis first is carried out to the alloy billet of interception, then forged.
By carrying out chemical component spectrum analysis to the alloy billet of 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 back temperature rise≤10 DEG C of the quenching.It avoids the front and back temperature rise of quenching too fast and influences 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, makes all kinds of alloys member in alloy billet
Plain sufficiently 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 latching ship, long service life.
The alloy billet is kept the temperature at 1200~1300 DEG C, guarantees that all alloying elements are outstanding in the alloy billet
It is the abundant solid solution of Nb, and there are certain relationship in soaking time and morphology volume (mainly maximum cross section), 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, forge effect with can obtain predetermined deformation quantity.
Control pretreatment temperature opens forging, final forging temperature, can prevent due to forging front and back excessive temperature differentials, bring stress greatly,
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
℃；The temperature requirement for advantageously ensuring that 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 improving the uniformity for forging steel billet tissue,
Keep the crystal grain for forging steel billet fine and smooth uniformly, so as to improve banded structure is forged, and then reduces 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 heating method 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 elongation forms ferrite and the alternatively distributed banded structure pattern of pearlite after completing transformation, and 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
At, and quickly grow up to pearlite, band-like martensite is formed in subsequent cooling procedure, leads to the elongation of the alloy billet
Rate decline.
Normalizing and tempering are increased to the alloy billet after finish forge, is released effectively and forges stress, and make
Steel fibre after forging uniformly, chemical component element sufficiently fuse, the intensity of the alloy billet is improved, so that manufacture 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.
Detailed description of the invention
The present invention will be further described for attached drawing, but the content in attached drawing does not constitute 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
To further illustrate the technical scheme of 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 billet, as shown in table 1, surplus is for Fe and not
Evitable impurity；
In the metal structure of embodiment A1~A4 alloy billet, 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 component 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, keep the temperature 14.5h；, then wind cooling temperature lowering
Tempering is carried out after to 200 DEG C or less, the tempering 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 carries out ultrasonic examination inspection to the alloy billet, described in control behind the rough turn outside of the alloy billet
Each portion's scale error of semi-finished product, 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 being first heated to furnace temperature is 450 DEG C, 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, being heated to furnace temperature is 860 DEG C, 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 are quenched in water base quenching cycles pond, controls water base quenching cycles
Liquid temperature in pond is 40 DEG C, cool time 25min, controls front and back temperature rise≤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, tempering 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, controls water base quench
40 DEG C, cool time 25min of liquid temperature in fiery circulatory pool, control front and back temperature rise≤10 DEG C of quenching, the semi-finished product it is cold
But temperature≤150 DEG C；Then cycle temper tempering is secondary, and tempering temperature is 600 DEG C, soaking time 14h；
(3.5) surface 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 surface hardness of the semi-finished product；
Mechanics properties testing is carried out to the semi-finished product again, 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 to the semi-finished product after Overheating Treatment, after semifinishing
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, 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, still maintains superiority 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
1000MPa or more, 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 billet is composed of the following components: C:0.34%, Si:0.28%, Mn:0.54%, P:
0.007%, S:0.004%, V:0.09%, Cu:0.03%, Cr:1.55%, Mo:0.28%, Ni:1.58%, Nb:0.02%,
Surplus is Fe and inevitable impurity；
In the metal structure of embodiment B1~B4 alloy billet, 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 component spectrum analysis is carried out to the alloy billet of interception, and to described
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, 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 being first heated to furnace temperature is 450 DEG C, 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, being heated to furnace temperature is 860 DEG C, 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 are quenched in water base quenching cycles pond, controls water base quenching cycles
Liquid temperature in pond is 40 DEG C, cool time 25min, controls front and back temperature rise≤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, tempering 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, controls water base quench
40 DEG C, cool time 25min of liquid temperature in fiery circulatory pool, control front and back temperature rise≤10 DEG C of quenching, the semi-finished product it is cold
But temperature≤150 DEG C；Then cycle temper tempering is secondary, and tempering temperature is 600 DEG C, soaking time 14h；
(3.5) surface 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 surface hardness of the semi-finished product；
Mechanics properties testing is carried out to the semi-finished product again, 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 to the semi-finished product after Overheating Treatment, after semifinishing
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, 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 component 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 carries out ultrasonic examination inspection to the alloy billet, described in control behind the rough turn outside of the alloy billet
Each portion's scale error of semi-finished product, 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 being first heated to furnace temperature is 450 DEG C, 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, being heated to furnace temperature is 860 DEG C, 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 are quenched in water base quenching cycles pond, controls water base quenching cycles
Liquid temperature in pond is 40 DEG C, cool time 25min, controls front and back temperature rise≤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, tempering 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, controls water base quench
40 DEG C, cool time 25min of liquid temperature in fiery circulatory pool, control front and back temperature rise≤10 DEG C of quenching, the semi-finished product it is cold
But temperature≤150 DEG C；Then cycle temper tempering is secondary, and tempering temperature is 600 DEG C, soaking time 14h；
(3.5) surface 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 surface hardness of the semi-finished product；
Mechanics properties testing is carried out to the semi-finished product again, 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 to the semi-finished product after Overheating Treatment, after semifinishing
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, 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 component 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, keep the temperature 14.5h；, then wind cooling temperature lowering
Tempering is carried out after to 200 DEG C or less, the tempering 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 carries out ultrasonic examination inspection to the alloy billet, described in control behind the rough turn outside of the alloy billet
Each portion's scale error of semi-finished product, to obtain the semi-finished product of safe locking pin；
Step 3 carries out semifinishing and finishing to the semi-finished product, carries out to the semi-finished product after semifinishing
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, 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 component 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, keep the temperature 14.5h；, then wind cooling temperature lowering
Tempering is carried out after to 200 DEG C or less, the tempering 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 carries out ultrasonic examination inspection to the alloy billet, described in control behind the rough turn outside of the alloy billet
Each portion's scale error of semi-finished product, 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 being first heated to furnace temperature is 450 DEG C, 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, being heated to furnace temperature is 860 DEG C, 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 are quenched in water base quenching cycles pond, controls water base quenching cycles
Liquid temperature in pond is 40 DEG C, cool time 25min, controls front and back temperature rise≤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, tempering 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, controls water base quench
40 DEG C, cool time 25min of liquid temperature in fiery circulatory pool, control front and back temperature rise≤10 DEG C of quenching, the semi-finished product it is cold
But temperature≤150 DEG C；Then cycle temper tempering is secondary, and tempering temperature is 600 DEG C, soaking time 14h；
(3.5) surface 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 surface hardness of the semi-finished product；
Mechanics properties testing is carried out to the semi-finished product again, 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 to the semi-finished product after Overheating Treatment, after semifinishing
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, 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 carries out ultrasonic examination inspection to existing rolling steel billet, controls the semi-finished product behind the rough turn outside of existing rolling steel billet
Each portion's scale error, to obtain the semi-finished product of safe locking pin；
Step 2 carries out semifinishing and finishing to the semi-finished product, carries out to the semi-finished product after semifinishing
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, 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 component 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., existing rolling steel billet is carried out rough turning and rough milled to add
Work carries out ultrasonic examination inspection to existing rolling steel billet, controls the semi-finished product behind the rough turn outside of existing rolling steel billet
Each portion's scale error, 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 being first heated to furnace temperature is 450 DEG C, 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, being heated to furnace temperature is 860 DEG C, 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 are quenched in water base quenching cycles pond, controls water base quenching cycles
Liquid temperature in pond is 40 DEG C, cool time 25min, controls front and back temperature rise≤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, tempering 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, controls water base quench
40 DEG C, cool time 25min of liquid temperature in fiery circulatory pool, control front and back temperature rise≤10 DEG C of quenching, the semi-finished product it is cold
But temperature≤150 DEG C；Then cycle temper tempering is secondary, and tempering temperature is 600 DEG C, soaking time 14h；
(3.5) surface 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 surface hardness of the semi-finished product；
Mechanics properties testing is carried out to the semi-finished product again, 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 to the semi-finished product after Overheating Treatment, after semifinishing
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, 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 component spectrum analysis first is 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, keep the temperature 14.5h；, then wind cooling temperature lowering
Tempering is carried out after to 200 DEG C or less, the tempering 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 carry out ultrasonic examination inspection, control to existing rolling steel billet behind the rough turn outside of existing rolling steel billet
Each portion's scale error of the semi-finished product, 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 being first heated to furnace temperature is 450 DEG C, 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, being heated to furnace temperature is 860 DEG C, 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 are quenched in water base quenching cycles pond, controls water base quenching cycles
Liquid temperature in pond is 40 DEG C, cool time 25min, controls front and back temperature rise≤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, tempering 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, controls water base quench
40 DEG C, cool time 25min of liquid temperature in fiery circulatory pool, control front and back temperature rise≤10 DEG C of quenching, the semi-finished product it is cold
But temperature≤150 DEG C；Then cycle temper tempering is secondary, and tempering temperature is 600 DEG C, soaking time 14h；
(3.5) surface 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 surface hardness of the semi-finished product；
Mechanics properties testing is carried out to the semi-finished product again, 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 to the semi-finished product after Overheating Treatment, after semifinishing
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, 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 comparison it is found that the alloy billet consistency by forging
High, good toughness and steel fibre, which form, centainly uniformly flows to form, avoids moment overload impact from being 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 comparison it is found that increasing normalizing to the alloy billet after finish forge
And tempering, be released effectively and forge stress, and make the steel fibre after forging uniformly, chemical component element sufficiently fuse,
Improve the intensity of the alloy billet so that manufacture low temperature heavy duty high-performance safe locking pin under low temperature high-impact, by
Power is uniform；
By embodiment A1~A4 and embodiment B3 comparison it is found that alloy billet is after copying is at the 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 is excellent in, 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 comparison 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, coarse grain size can be reduced
The mechanical property of steel；
By embodiment A1~A4 and embodiment C1~C3 comparison it is found that existing rolling steel billet density is loose, exist a large amount of
Shrinkage cavity, even if the later period, by forging and being heat-treated, every mechanical property is also not 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 invention is described above in combination with a specific embodiment.These descriptions are intended merely to explain of the invention
Principle, and shall not be construed in any way as a limitation of the scope of protection of the invention.Based on the explanation herein, the technology of this field
Personnel can associate with other specific embodiments of the invention without creative labor, 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 comprises the following steps:
Step A intercepts alloy billet, and forges to the alloy billet of interception:
Step A1 is heated to 1200~1300 DEG C to the alloy billet, and keeps the temperature 14~15h；
Step A2 carries out rough forge to the alloy billet after heating and thermal insulation, wherein the starting forging temperature of the rough forge 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 heating of the diffusion annealing
Temperature is 1100~1200 DEG C, and keeps the temperature 14~15h；
Step A4 carries out finish forge to the alloy billet after diffusion annealing, wherein the starting forging temperature of the finish forge is
1000~1100 DEG C, the final forging temperature of the finish forge is >=900 DEG C；
Step A5 is heated to 880 DEG C to the alloy billet normalizing after finish forge, keeps the temperature 14~15h, then wind cooling temperature lowering is extremely
Tempering is carried out after 200 DEG C or less, the tempering 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 being cooled to room temperature, i.e., carries out rough turning to the alloy billet and rough mill
Processing, 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, to obtain the high property of low temperature heavy duty
It can safe locking pin；
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.
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 are quenched in water base quenching cycles pond, control water base quenching cycles pond by step C2
In liquid temperature be 30~55 DEG C, the cool time be 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 tempering temperature is 590~610 DEG C, when heat preservation
Between be 14h；
The semi-finished product that tempering is come out of the stove are quenched again in water base quenching cycles pond, control water base quenching by step C4
30~55 DEG C of liquid temperature in circulatory pool, cool time are 25~30min, cooling temperature≤150 DEG C of the semi-finished product；Then it follows
Loopback fire is secondary, and tempering 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
Suddenly the heating and thermal insulation of C1 includes:
The semi-finished product are put into well-type electric furnace by preheating step, and being first heated to furnace temperature is 430~470 DEG C, and keeps the temperature 2h；Then
Being heated to furnace temperature is 630~670 DEG C, and keeps the temperature 1h；
Incubation step, after the preheating step, being heated to furnace temperature is 840~880 DEG C, 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:
Surface hardness detection first is carried out to the semi-finished product, the surface hardness of surface at least three point of the semi-finished product is examined, tests
Demonstrate,prove the surface hardness of the semi-finished product；
Mechanics properties testing is carried out to the semi-finished product again, 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, it is characterised in that: the conjunction
In the metal structure of golden steel billet, ferritic volume fraction is 30~45%, and the volume fraction of bainite is 10~25%, tempering
The volume fraction of martensite 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
Further include following checkout procedure in the copying of rapid B:
Step B1 carries out ultrasonic examination inspection to the alloy billet behind the rough turn outside of the alloy billet；
Step B2 controls each portion's scale error of the semi-finished product in rough turning and during rough mill tooth copying.
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 further include:
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 component 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: described
Front and back temperature rise≤10 DEG C of quenching.
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Application publication date: 20180706 Assignee: Guangdong Yaoda Financial Leasing Co.,Ltd. Assignor: KEEN OFFSHORE ENGINEERING Co.,Ltd. Contract record no.: X2020980005507 Denomination of invention: A manufacturing method of low temperature heavy load high performance safety locking pin Granted publication date: 20190129 License type: Exclusive License Record date: 20200828 |
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