CN109913737A - High-strength bolt and preparation method thereof - Google Patents
High-strength bolt and preparation method thereof Download PDFInfo
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Abstract
A kind of high-strength bolt and preparation method thereof, is related to bolt field.The high-strength bolt includes the body of bolt and the nitrogen oxygen-carbon co-cementation layer set on body of bolt surface；The mass percent of each ingredient in the body of bolt are as follows: C:0.35~0.40%, Si:0.4~0.6%, Mn:0.8~1.0%, Cr:0.8~1.0%, Mo:0.15~0.2%, V:0.10~0.15%, Ni:0.15~0.2%, Al:0~0.10%, surplus are Fe and inevitable impurity.The preparation method of the high-strength bolt is the following steps are included: obtain the body of bolt for the heating of bolt idiosome made of medium carbon low alloy steel, quenching treatment；The body of bolt is subjected to tempering, and carries out the processing of nitrogen oxygen-carbon co-cementation while tempering.High-strength bolt provided by the present application and preparation method thereof can improve fatigue life and the environmental corrosion resisting performance of high-strength bolt obtained.
Description
Technical field
This application involves technical field of bolt processing, in particular to a kind of high-strength bolt and preparation method thereof.
Background technique
High-strength bolt generally refers to bolt of the performance rate at 8.8 grades or more.High-strength bolt is a kind of important tight
Firmware, it is many kinds of and be widely used in the fields such as machinery, naval vessel, rail traffic, bridge.High-strength bolt generally uses
Middle Low-carbon High Strength steel making needs to improve endurance while improving its obdurability using modifier treatment during the preparation process
Performance.In addition, almost all of high-strength bolt requires to carry out surface anticorrosion processing to improve environmental corrosion resisting performance, to mention
High service life and military service safety coefficient.
Currently, the major surfaces method for anticorrosion treatment of high-strength bolt has phospholeum, plating, chemical plating, surface is being carried out
It also needs to carry out the pre-treatments such as surface degreasing, pickling, activation before preservative treatment, these pretreatment modes can generate a large amount of useless
Liquid discharge, easily causes serious environmental pollution.Simultaneously in the method for surface anticorrosion processing, phospholeum anti-corrosion effect is relatively
Difference；Plating, chemical plating anti-corrosion effect are relatively preferable but at high cost, while can also generate a large amount of waste liquid.It can be seen that high-strength
The surface anticorrosion processing technique of degree bolt still has biggish improvement and a room for promotion, the antiseptic property of high-strength bolt, especially
It is that the corrosive nature of acid rain resistant and marine environment also needs significantly to be promoted.
Summary of the invention
The application's is designed to provide a kind of high-strength bolt and preparation method thereof, to improve the fatigue of high-strength bolt
Service life and environmental corrosion resisting performance.
Embodiments herein is achieved in that
In a first aspect, the embodiment of the present application provides a kind of high-strength bolt comprising the spiral shell made of medium carbon low alloy steel
Body and nitrogen oxygen-carbon co-cementation layer set on body of bolt surface；
Wherein, each ingredient includes: C:0.35~0.40% by mass percentage in medium carbon low alloy steel, and Si:0.4~
0.6%, Mn:0.8~1.0%, Cr:0.8~1.0%, Mo:0.15~0.20%, V:0.10~0.15%, Ni:0.15~
0.2%, Al:0~0.10%, surplus are Fe and inevitable impurity.
High-strength bolt provided by the embodiments of the present application includes the body of bolt made of medium carbon low alloy steel and in bolt body surface
The nitrogen oxygen-carbon co-cementation layer of face setting, can effectively improve the hardness for the high-strength bolt being prepared by nitrogen oxygen-carbon co-cementation layer
With intensity, corrosion resistance and fatigue performance；In addition, by the mass percentage content of each ingredient in control medium carbon low alloy steel,
Can guarantee the stable and reliable for performance of the body of bolt of high-strength bolt, high-strength bolt provided by the present application be 35CrMo,
It further designs and manufactures in ingredient on the basis of 42CrMo material and is improved in technique, the content of stringent control C element,
And the content of Si, Mn element is improved, by the way that V, Ni alloying element is added, ingredient even tissue, cleanliness height, crystal grain can be obtained
Thinner high-strength bolt, to guarantee the mechanical performance for the high-strength bolt being prepared.
In some optional embodiments, the surface of nitrogen oxygen-carbon co-cementation layer, which is additionally provided with, includes nanoporous Fe-N alloyed powder
The Aluminum Coating at end.
In above-mentioned technical proposal, nanoporous Fe-N alloy powder is contained by the setting on the surface of nitrogen oxygen-carbon co-cementation layer
Aluminum Coating, can further improve corrosion resisting property, damping capacity and the coefficient of friction of high-strength bolt, to guarantee to prepare
Obtained high-strength bolt can have certain cushioning effect and loosen performance.
In some optional embodiments, the nanoporous for being 3%~5% containing mass percent in Aluminum Coating
Fe-N alloy powder；Optionally, Aluminum Coating with a thickness of 5 μm~8 μm.
In above-mentioned technical proposal, closed by the way that the nanoporous Fe-N that mass percent is 3~5% is added in Aluminum Coating
Bronze end, can guarantee that nanoporous Fe-N alloy powder is uniformly scattered in Aluminum Coating, and be covered in the table of the body of bolt
Face, to play the effect of improving corrosion resisting property, damping capacity and coefficient of friction；By control Aluminum Coating with a thickness of 5 μm~8
μm, it will be able to effective corrosion resistance, damping capacity and the coefficient of friction for improving high-strength bolt surface.
In some optional embodiments, impurity includes: S < 0.015%, P by mass percentage in medium carbon low alloy steel
< 0.015%, O < 0.0015%, N < 0.0020%.
In above-mentioned technical proposal, by the content of the impurity elements such as stringent control S, P, O, N, can be avoided them is reduced
It is enough to guarantee that the high-strength bolt being prepared has for the tissue homogeneous degree and crystallite size for the high-strength bolt being prepared
Intensity and hardness.
In some optional embodiments, nitrogen oxygen-carbon co-cementation layer includes the gas permeation diffusion layer set on body of bolt surface
With the gas permeation compound layer for being set to gas permeation diffusion layer surface；Optionally, gas permeation diffusion layer with a thickness of
0.15mm~0.25mm；Optionally, gas permeation compound layer with a thickness of 5 μm~20 μm.
In above-mentioned technical proposal, nitrogen oxygen-carbon co-cementation layer is by being set to the gas permeation diffusion layer on body of bolt surface and being set to gas
The gas permeation compound layer composition of layer surface is spread in permeation, and gas permeation diffusion layer is by gas permeation compound layer in Re Chu
Dissolution and to diffuseing to form inside body of bolt when reason.By control gas permeation diffusion layer with a thickness of 0.15mm~0.25mm
And control gas permeation compound layer with a thickness of 5 μm~20 μm, can effectively improve the structural strength and anti-corruption of the body of bolt
Corrosion energy.
Second aspect, the embodiment of the present application also provides the preparation method of high-strength bolt in first aspect, including it is following
Step:
By the heating of bolt idiosome made of medium carbon low alloy steel, quenching treatment, the body of bolt is obtained；
The body of bolt is subjected to tempering, and carries out the processing of nitrogen oxygen-carbon co-cementation while tempering.
The preparation method of high-strength bolt provided by the embodiments of the present application is after medium carbon low alloy steel to be made to bolt idiosome,
Heating, quenching treatment obtain the body of bolt, then by the body of bolt carry out tempering while carry out the processing of nitrogen oxygen-carbon co-cementation, with
Body of bolt surface forms nitrogen oxygen-carbon co-cementation layer.The preparation method of the high-strength bolt improves traditional heat treatment process, in spiral shell
Bolt idiosome directly heats water-bath quenching after forming, and carbon nitrogen surface gas permeation processing is carried out during tempering, entire to add
The processes such as progress pickling, activation, oil removing are not needed during work can during the preparation process without waste liquid, solid waste discharge
Under the premise of guaranteeing bolt product performance and quality, environmental pollution and save the cost is greatly reduced.
In some optional embodiments, bolt idiosome made of medium carbon low alloy steel is heated to 840 DEG C~860 DEG C
It is quenched afterwards using 50 DEG C~60 DEG C of water-bath.
In above-mentioned technical proposal, by being quenched at 840 DEG C~860 DEG C using 50~60 DEG C of water-bath, it can drop
Low cost and reduce environmental pollution, make body of bolt surface no longer need to carry out the cleaning treatments such as pickling or oil removing.
In some optional embodiments, the processing of nitrogen oxygen-carbon co-cementation is first to be passed through air in tempering, then logical
Entering the mixed gas that bleeding agent after ammonia, air and atomization forms, the volume ratio of ammonia and air is 5~7:1 in mixed gas,
The volume ratio of the total volume and bleeding agent of ammonia and air is 1:35 × 10 in mixed gas-6~50 × 10-6；C in bleeding agent,
H, the atomic ratio of O is 10~14:40~44:10~12.
In above-mentioned technical proposal, by being permeated after passing sequentially through air and ammonia, air and atomization in drawing process
The mixed gas of agent composition can form nitrogen oxygen-carbon co-cementation layer on body of bolt surface, pass through ammonia, air in control mixed gas
With the atomic ratio of C, H, O in the volume ratio and bleeding agent of bleeding agent after atomization, it can further control body of bolt surface and be formed
Nitrogen oxygen-carbon co-cementation layer structure, to improve the intensity and corrosion resistance of the high-strength bolt that are prepared.
In some optional embodiments, the temperature of tempering is 550 DEG C~650 DEG C, and the time of tempering is
0.5h~1.5h；Optionally, it is 1:2~4 that the time of air is passed through when tempering and is passed through the time ratio of mixed gas.
It, can be according to the size of bolt in bolt by controlling the temperature and time of tempering in above-mentioned technical proposal
Body surface face forms nitrogen oxygen-carbon co-cementation layer, to improve the performance of high-strength bolt；Simultaneously by being passed through air when control tempering
With the time ratio of mixed gas, it can adjust and form the thickness of nitrogen oxygen-carbon co-cementation layer on body of bolt surface, to adjust high intensity
The performance of bolt.
In some optional embodiments, step further include: the body of bolt is subjected to tempering, and in tempering
After carrying out nitrogen oxygen-carbon co-cementation processing simultaneously, cooling simultaneously coats the Aluminum Coating containing nanoporous Fe-N alloy powder, dries.
In above-mentioned technical proposal, it is further formed after nitrogen oxygen-carbon co-cementation layer is prepared in body of bolt surface more containing nanometer
The Aluminum Coating of hole Fe-N alloy powder can effectively improve corrosion resistance, damping capacity and the coefficient of friction of high-strength bolt.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only some embodiments of the application, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the microscopic appearance schematic diagram of the surface texture for the high-strength bolt that the embodiment of the present application 1 provides.
In figure: 100- bolt matrix；110- gas permeation diffusion layer；120- gas permeation compound layer；130- zinc
Aluminized coating.
Specific embodiment
It, below will be in the embodiment of the present application to keep the purposes, technical schemes and advantages of the embodiment of the present application clearer
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
High-strength bolt of the application and preparation method thereof is described in further detail with reference to embodiments.
In a first aspect, the embodiment of the present application provides a kind of high-strength bolt comprising made of medium carbon low alloy steel
The body of bolt and nitrogen oxygen-carbon co-cementation layer set on body of bolt surface；The mass percent of each ingredient in medium carbon low alloy steel are as follows: C:
0.35%~0.40%, Si:0.4%~0.6%, Mn:0.8%~1.0%, Cr:0.8%~1.0%, Mo:0.15%~
0.20%, V:0.10%~0.15%, Ni:0.15%~0.2%, Al:0%~0.10%, surplus is for Fe and inevitably
Impurity.
In the application, in the medium carbon low alloy steel, middle carbon refer to the mass percent of carbon 0.25%~
Between 0.65%, low-alloy refers to the mass percent of alloying element less than 5%；Nitrogen oxygen-carbon co-cementation layer be to workpiece surface simultaneously
Penetrate into the obtained infiltration layer of chemical surface heat treatment process of nitrogen, oxygen, carbon.
High-strength bolt provided by the present application body of bolt made of medium carbon low alloy steel and it is covered in body of bolt surface
Nitrogen oxygen-carbon co-cementation layer composition, by carbon content in strict control medium carbon low alloy steel and each alloying element content of adjustment to obtain into
Divide even tissue, cleanliness height, the thinner high-strength bolt steel material of crystal grain, wherein control C content simultaneously adjusts Si, Mn element
Content can improve corrosion resistance under the premise of control structure intensity；The content for adjusting addition V element is conducive to improve back
Fiery stability and refinement microstructure；The content for adjusting addition Ni element is conducive to improve toughness plasticity, is at surface gas permeation
Reason lays the foundation, and the structure that the nitrogen oxygen-carbon co-cementation layer on body of bolt surface can further effectively improve high-strength bolt is strong
Degree, hardness and corrosion resistance.
In some alternative embodiments, in medium carbon low alloy steel C mass percent can also for 0.35%,
0.36%, 0.37%, 0.38%, 0.39%, 0.40%.In some alternative embodiments, in medium carbon low alloy steel Si matter
Measure percentage can also for 0.41%, 0.42%, 0.43%, 0.44%, 0.45%, 0.46%, 0.47%, 0.48%,
0.49%, 0.50%, 0.51%, 0.52%, 0.53%, 0.54%, 0.55%, 0.56%, 0.57%, 0.58%, 0.59%,
0.60%.In some alternative embodiments, in medium carbon low alloy steel Mn mass percent can also for 0.81%,
0.82%, 0.83%, 0.84%, 0.85%, 0.86%, 0.87%, 0.88%, 0.89%, 090%, 0.91%, 0.92%,
0.93%, 0.94%, 0.95%, 0.96%, 0.97%, 0.98%, 0.99%, 1.0%.In some alternative embodiments,
In medium carbon low alloy steel the mass percent of Cr can also for 0.81%, 0.82%, 0.83%, 0.84%, 0.85%,
0.86%, 0.87%, 0.88%, 0.89%, 090%, 0.91%, 0.92%, 0.93%, 0.94%, 0.95%, 0.96%,
0.97%, 0.98%, 0.99%, 1.0%.In some alternative embodiments, in medium carbon low alloy steel Mo mass percent
It can also be 0.16%, 0.17%, 0.18%, 0.19%, 0.20%.In some alternative embodiments, medium carbon low alloy steel
The mass percent of middle V can also be 0.11%, 0.12%, 0.13%, 0.14%, 0.15%.In some optional embodiments
In, the mass percent of Ni can also be 0.16%, 0.17%, 0.18%, 0.19%, 0.20% in medium carbon low alloy steel.?
In some optional embodiments, in medium carbon low alloy steel the mass percent of Al can also for 0.01%, 0.02%, 0.03%,
0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.10%.
In some alternative embodiments, nitrogen oxygen-carbon co-cementation layer include set on body of bolt surface gas permeation diffusion layer and
Set on the gas permeation compound layer of gas permeation diffusion layer surface；Wherein, gas permeation compound layer with a thickness of 5 μm~20
μm or 10 μm~15 μm, such as, but not limited to 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μ
m,16μm,17μm,18μm,19μm,20μm；Gas permeation diffusion layer with a thickness of 0.15mm~0.25mm, such as, but not limited to
0.15mm、0.16mm、0.17mm、0.18mm、0.19mm、0.20mm、0.21mm、0.22mm、0.23mm、0.24mm、0.25mm。
In some alternative embodiments, in nitrogen oxygen-carbon co-cementation layer N, O, C atomic ratio be 70~75:20~25:5~
10, such as, but not limited to 70:20:10,70:25:10,70:20:5,75:20:10,75:25:5,72:22:8,70:25:5,75:
25:10.It is 70~75:20~25:5~10 nitrogen oxygen-carbon co-cementation by the way that nitrogen oxygen to carbon atom ratio is prepared on body of bolt surface
Layer, can effectively improve the intensity and corrosion resistance of high-strength bolt.
In some alternative embodiments, nitrogen oxygen-carbon co-cementation layer surface, which is additionally provided with, includes nanoporous Fe-N alloy powder
Aluminum Coating, the mass percent of nanoporous Fe-N alloy powder is 3%~5% in Aluminum Coating.Fe-N alloy powder tool
Have the advantages that hardness is high, wear-resisting property is good, corrosion resisting property is strong, list of bolts can significantly be improved by adding it in Aluminum Coating
Corrosion resisting property, damping capacity and the coefficient of friction in face.In some alternative embodiments, the matter of nanoporous Fe-N alloy powder
Measuring percentage can also be 3%, 3.5%, 4%, 4.5%, 5%.In some alternative embodiments, Aluminum Coating with a thickness of
5 μm~8 μm, such as, but not limited to 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm.
In some alternative embodiments, in medium carbon low alloy steel impurity mass percent are as follows: S < 0.015%, P <
0.015%, O < 0.0015%, N < 0.0020%.In some alternative embodiments, in medium carbon low alloy steel S quality percentage
Than can also be < 0.010%, < 0.005%.In some alternative embodiments, in medium carbon low alloy steel P mass percent
Can also for < 0.010%, < 0.005%.In some alternative embodiments, the mass percent of O is also in medium carbon low alloy steel
Can for < 0.0010%, < 0.0005%.In some alternative embodiments, the mass percent of N is also in medium carbon low alloy steel
Can for < 0.0015%, < 0.0010%, < 0.0005%.Pass through the impurity such as S, P, O, N in strict control medium carbon low alloy steel member
The content of element, can be avoided impurity element and adversely affects to the ingredient tissue and crystal grain of the body of bolt, reduce high-strength bolt
Mechanical performance and resistance to corrosion.
Second aspect, present invention also provides the preparation methods of high-strength bolt in above-mentioned first aspect, including following step
It is rapid:
Medium carbon low alloy steel is processed into bolt idiosome, then successively heated, be quenched to obtain the body of bolt；
The body of bolt is subjected to tempering, and carries out the processing of nitrogen oxygen-carbon co-cementation while tempering, subsequent cooling is
?.
The preparation method of middle high-strength bolt provided by the embodiments of the present application improves the processing technology of high-strength bolt, will
After manufactured bolt idiosome heating, quenching treatment, the processing of nitrogen oxygen-carbon co-cementation is directly carried out while tempering, it is entire to process
Treatment process does not need to carry out the processes such as conventional pickling, activation, oil removing, under the premise of guaranteeing properties of product and quality, energy
Environmental pollution and save the cost is enough greatly reduced, and during the preparation process without waste liquid, solid waste discharge, to environment without dirt
Dye, and the novel high-strength bolt with long-fatigue life and high corrosion-resistant is prepared.
In some alternative embodiments, the preparation method of medium carbon low alloy steel may is that the member by medium carbon low alloy steel
Cellulose content proportion weighs raw material, by gas shield electroslag furnace melting after being smelted using vacuum electric furnace, then pass through warm and hot forging and
Medium carbon low alloy steel blank material is made in hot rolling, finally removes surface-carburized layer and oxide skin obtains medium carbon low alloy steel, make to be prepared into
To the autstenitic grain size of medium carbon low alloy steel be maintained at 7 grades or more, guarantee the spiral shell being prepared using medium carbon low alloy steel
Bolt idiosome has strong structural strength.In some alternative embodiments, heating can use induction heating.
In some alternative embodiments, quenching treatment be at 840 DEG C~860 DEG C using 50 DEG C~60 DEG C water-bath into
Row quenching.It is quenched by using water-bath, can be avoided environmental pollution caused by when being quenched using oil bath or polymer
And cost, while can also remove the subsequent progress cleaning procedures such as pickling or oil removing from, while reducing cost and process
It also avoids polluting the environment.In some alternative embodiments, the temperature of quenching treatment can also for 841 DEG C, 842 DEG C,
843℃、844℃、845℃、846℃、847℃、848℃、849℃、850℃、851℃、852℃、853℃、854℃、855
℃,856℃,857℃,858℃,859℃,860℃.In some alternative embodiments, the temperature of water-bath is also when quenching treatment
It can be 51 DEG C, 52 DEG C, 53 DEG C, 54 DEG C, 55 DEG C, 56 DEG C, 57 DEG C, 58 DEG C, 59 DEG C, 60 DEG C.
In some alternative embodiments, nitrogen oxygen-carbon co-cementation processing is first to be passed through air in tempering, is subsequently passed
The mixed gas that bleeding agent forms after ammonia, air and atomization, the volume ratio of ammonia and air is 5~7:1 in mixed gas, is mixed
The volume ratio of the total volume and bleeding agent that close ammonia in gas gas and air is 1:35 × 10-6~50 × 10-6；C, H, O in bleeding agent
Atomic ratio be 10~14:40~44:10~12.By passed sequentially through during tempering air and ammonia, air and
The mixed gas that bleeding agent forms after atomization can form nitrogen oxygen-carbon co-cementation layer on the surface of the body of bolt, to effectively improve
The hardness and resistance to corrosion of the body of bolt.In some alternative embodiments, the volume ratio of ammonia and air is also in mixed gas
It can be 5:1,5.5:1,6:1,6.5:1,7:1.In some alternative embodiments, in mixed gas ammonia and air totality
Long-pending and bleeding agent volume ratio can also be 1:35 × 10-6, 1:40 × 10-6, 1:45 × 10-6, 1:50 × 10-6.Some optional
Embodiment in, in bleeding agent the atomic ratio of C, H, O can also for 12:42:10,10:40:10,10:42:12,12:42:12,
11:41:11,14:44:11.In some alternative embodiments, bleeding agent can be mixed with by acetone, methanol, aniline
It arrives.Atomic ratio by C, H, O in control bleeding agent is 10~14:40~44:10~12, and while adjusting tempering is passed through sky
The volume and time ratio for the mixed gas that bleeding agent forms after gas and ammonia, air and atomization, can control body of bolt surface shape
At nitrogen oxygen-carbon co-cementation layer in N, O, C atomic ratio be 70~75:20~25:5~10, thus guarantee the body of bolt have it is excellent
Corrosion resistance and mechanical performance.
In some alternative embodiments, the temperature of tempering can also be 550 DEG C~650 DEG C or 575 DEG C~625
DEG C, such as, but not limited to 560 DEG C, 570 DEG C, 580 DEG C, 590 DEG C, 600 DEG C, 610 DEG C, 620 DEG C, 630 DEG C, 640 DEG C, 650 DEG C；It returns
The time of fire processing can also be 0.6h, 0.7h, 0.8h, 0.9h, 1h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, tempering
Time can also extend or reduce according to the size of bolt sample and actual demand.
In some alternative embodiments, the time that air is passed through when tempering and the time ratio for being passed through mixed gas are
1:2~4.By being passed through the time of air when control tempering and being passed through the time ratio of mixed gas, can control in bolt body surface
The thickness size for the nitrogen oxygen-carbon co-cementation layer that face is formed, is passed through the time of air and the time ratio for being passed through mixed gas is bigger, nitrogen oxygen
The thickness of carbon co-penetration layer is smaller, is passed through the time of air and is passed through time of mixed gas than smaller, the thickness of nitrogen oxygen-carbon co-cementation layer
It spends bigger.In some alternative embodiments, it is passed through the time of air when tempering and is passed through the time ratio of mixed gas also
It can be 1:2,1:2.5,1:3,1:3.5,1:4.
In some alternative embodiments, the body of bolt is subjected to tempering, and carries out nitrogen oxygen while tempering
After carbon permeation processing, cooling, the Aluminum Coating containing nanoporous Fe-N alloy powder can also be further coated, is dried.It can
Choosing, the temperature of drying is 300 DEG C~350 DEG C, and the temperature of such as drying can be 310 DEG C, 320 DEG C, 330 DEG C, 340 DEG C, 350
℃。
The feature to high-strength bolt provided by the embodiments of the present application and performance are made further detailed with reference to embodiments
Thin description.
Embodiment 1
A kind of preparation method of high-strength bolt, the bolt are manufactured using medium carbon low alloy steel, medium carbon low alloy steel blank material
The mass percent of ingredient is as follows: carbon C:0.35%；Silicon Si:0.6%；Manganese Mn:0.80%；Chromium Cr:1.0%；Molybdenum Mo:
0.20%；Vanadium V:0.10%；Nickel: 0.15%；Aluminium Al:0.10%；Iron Fe:96.87%；Wherein impurity element, sulphur S:
0.015%；Phosphorus P:0.015%；
Raw material is weighed by above-mentioned element proportion, is smelted using vacuum electric furnace, then by gas shield electroslag furnace melting, finally
Medium carbon low alloy steel blank material is made by warm and hot forging and hot rolling, medium carbon low alloy steel blank material after hot rolling removal surface-carburized layer and
Oxide skin makes autstenitic grain size be maintained at 7 grades or more.
Using the medium carbon low alloy steel blank material as raw material, bolt is formed after mid-frequency induction heating to obtain M24 × 80
Big hexagon head bolt, molding rear bolt be put into 50 DEG C at a temperature of 850 DEG C water-bath in quenched, the quenched body of bolt
Be directly placed into 550 DEG C of atmosphere furnace and be tempered, tempering total time is 1h, when tempering before 20min be air atmosphere, after
40min carries out tempering and gas permeation in the mixed atmosphere that the atomization gas of ammonia, air and Liquid Penetrant agent forms simultaneously
Processing forms nitrogen oxygen-carbon co-cementation layer；Wherein in mixed atmosphere the volume ratio of ammonia and air be 5:1, Liquid Penetrant agent by acetone,
Methanol, aniline are mixed with to obtain and carbon C, hydrogen H, oxygen O atomic ratio be 14:44:11, during permeation, to atmosphere furnace
In be often passed through 1m3The mixed gas of ammonia and air is then passed through the atomization gas of 35ml Liquid Penetrant agent.
Bolt after tempering is cooled to room temperature in the air of flowing, referring next to GB/T26110-2010 standard,
The zinc-aluminum paint for coating the nanoporous Fe-N alloy powder that one layer is 3% containing mass percent on the surface of bolt again, applies
The thickness control for the zinc-aluminum paint covered dries 30min in the environment of 300 DEG C at 5 μm, is then air-cooled to room temperature, obtains high-strength
Spend bolt.
As shown in Figure 1, carrying out microcosmic metallographic morphology analysis, high-intensitive spiral shell to the high-strength bolt that the present embodiment is prepared
Bolt includes bolt matrix 100, the gas permeation diffusion layer 110 for being sequentially arranged in 100 surface of bolt matrix, gas permeation
Compound layer 120 and Aluminum Coating 130, the thickness about 0.15mm of gas permeation diffusion layer 110, gas permeation compound layer 120
About 10 μm of thickness.Through detecting, the tensile strength of high-strength bolt reaches 1220MPa, and resistant slide load reaches 598kN, passes through
The neutral salt spray corrosion test of 1200h does not occur obviously to corrode.
Embodiment 2
A kind of preparation method of high-strength bolt, the bolt are manufactured using medium carbon low alloy steel, medium carbon low alloy steel blank material
The mass percent of ingredient is as follows: carbon C:0.40%；Silicon Si:0.4%；Manganese Mn:1.0%；Chromium Cr:0.8%；Molybdenum Mo:0.15%；
Vanadium V:0.15%；Nickel: 0.2%；Iron Fe:96.878%；Wherein impurity element, sulphur S:0.012%；Phosphorus P:0.010%；It weighs
Above-mentioned element is accumulative to add up to 100%.
It is smelted using vacuum electric furnace, then by gas shield electroslag furnace melting, is finally made by warm and hot forging and hot rolling
Carbon low alloy steel blank material, the medium carbon low alloy steel blank material after hot rolling need to remove surface-carburized layer and oxide skin, austenite grain
Degree is maintained at 7 grades or more.
Using the medium carbon low alloy steel blank material as raw material, bolt is formed after mid-frequency induction heating to obtain M24 × 80
Big hexagon head bolt, molding rear bolt be put into 60 DEG C at a temperature of 870 DEG C water-bath in quenched, the quenched body of bolt
Be directly placed into 600 DEG C of atmosphere furnace and be tempered, tempering total time is 80min, when tempering before 20min be air atmosphere, after
60min carries out tempering and gas permeation in the mixed atmosphere that the atomization gas of ammonia, air and Liquid Penetrant agent forms simultaneously
Processing forms nitrogen oxygen-carbon co-cementation layer；Wherein in mixed atmosphere the volume ratio of ammonia and air be 7:1, Liquid Penetrant agent by acetone,
Methanol, aniline are mixed with to obtain and carbon C, hydrogen H, oxygen O atomic ratio be 14:44:11, during permeation, to atmosphere furnace
In be often passed through 1m3The mixed gas of ammonia and air is then passed through the atomization gas of 50ml Liquid Penetrant agent.
Bolt after tempering is cooled to room temperature in the air of flowing, referring next to GB/T26110-2010 standard,
The zinc-aluminum paint for the nanoporous Fe-N alloy powder that one layer is 5% containing mass percent is applied in bolt surface again, coating
The thickness control of zinc-aluminum paint dries 30min in the environment of 350 DEG C after coating at 8 μm, is then air-cooled to room temperature, obtains high
Strength bolts.
In the nitrogen oxygen-carbon co-cementation layer on the high-strength bolt surface, about 15 μm of the thickness of gas permeation compound layer, gas is total
Seep the thickness about 0.20mm of diffusion layer.Through detecting, the tensile strength of high-strength bolt reaches 1135MPa, and resistant slide load reaches
591kN does not occur obviously to corrode by the neutral salt spray corrosion test of 2400h.
Embodiment 3
A kind of preparation method of high-strength bolt, the bolt are manufactured using medium carbon low alloy steel, medium carbon low alloy steel blank material
The mass percent of ingredient is as follows: carbon C:0.36%；Silicon Si:0.5%；Manganese Mn:0.8%；Chromium Cr:0.9%；Molybdenum Mo:0.18%；
Vanadium V:0.12%；Nickel: 0.2%；Iron Fe:96.92%；Wherein impurity element, sulphur S:0.010%；Phosphorus P:0.010%；It weighs
Above-mentioned element is accumulative to add up to 100%.
It is smelted using vacuum electric furnace, melting is then carried out by gas shield electroslag furnace, finally pass through warm and hot forging and hot rolling
Medium carbon low alloy steel blank material is made, by the decarburized layer and oxide skin on medium carbon low alloy steel blank material removal surface, makes austenite grain
Degree is maintained at 7 grades or more.
Using the medium carbon low alloy steel blank material as raw material, bolt is formed after mid-frequency induction heating to obtain M24 × 80
Big hexagon head bolt, molding rear bolt be put into 50 DEG C at a temperature of 860 DEG C water-bath in quenched, the quenched body of bolt
Be directly placed into 650 DEG C of atmosphere furnace and be tempered, tempering total time is 50min, when tempering before 10min be air atmosphere, after
40min carries out tempering and gas permeation in the mixed atmosphere that the atomization gas of ammonia, air and Liquid Penetrant agent forms simultaneously
Processing forms nitrogen oxygen-carbon co-cementation layer；Wherein in mixed atmosphere the volume ratio of ammonia and air be 6:1, Liquid Penetrant agent by acetone,
Methanol, aniline are mixed with to obtain and carbon C, hydrogen H, oxygen O atomic ratio be 14:44:11, during permeation, to atmosphere furnace
In be often passed through 1m3The mixed gas of ammonia and air is then passed through the atomization gas of 40ml Liquid Penetrant agent.
Bolt after tempering is cooled to room temperature in the air of flowing, referring to GB/T26110-2010 standard in bolt
Surface coats the zinc-aluminum paint of one layer of nanoporous Fe-N alloy powder containing 5% mass percent, the thickness of zinc-aluminum paint
Control toasts 30min in the environment of 350 DEG C after coating, is then cooled to room temperature in the air of flowing, obtains height at 8 μm
Strength bolts.
In the nitrogen oxygen-carbon co-cementation layer on the high-strength bolt surface, about 20 μm of the thickness of gas permeation compound layer, gas is total
Seep the thickness about 0.25mm of diffusion layer.Through detecting, the tensile strength of high-strength bolt reaches 1025MPa, and resistant slide load reaches
568kN does not occur obviously to corrode by the neutral salt spray corrosion test of 3500h.
In conclusion high-strength bolt provided by the present application can effectively improve hardness and strength, corrosion resistance and resistance to tired
Labor performance.The preparation method of high-strength bolt provided by the embodiments of the present application improves the heat treatment work in bolt process
Skill carries out carbon oxygen nitrogen surface gas permeation processing during tempering after bolt molding, do not need in whole process into
The processes such as row pickling, activation, oil removing can guarantee bolt product during the preparation process without waste liquid, solid waste discharge
Under the premise of energy and quality, environmental pollution and save the cost is greatly reduced.
Embodiments described above is some embodiments of the present application, instead of all the embodiments.The reality of the application
The detailed description for applying example is not intended to limit claimed scope of the present application, but is merely representative of the selected implementation of the application
Example.Based on the embodiment in the application, obtained by those of ordinary skill in the art without making creative efforts
Every other embodiment, shall fall in the protection scope of this application.
Claims (10)
1. a kind of high-strength bolt, which is characterized in that it include the body of bolt made of medium carbon low alloy steel and be set to the spiral shell
The nitrogen oxygen-carbon co-cementation layer of plug body surface；
Wherein, each ingredient includes: C:0.35%~0.40% by mass percentage in the medium carbon low alloy steel, and Si:0.4%~
0.6%, Mn:0.8%~1.0%, Cr:0.8%~1.0%, Mo:0.15%~0.20%, V:0.10%~0.15%, Ni:
0.15%~0.2%, Al:0%~0.10%, surplus are Fe and inevitable impurity.
2. high-strength bolt according to claim 1, which is characterized in that in the surface of the nitrogen oxygen-carbon co-cementation layer is additionally provided with
The Aluminum Coating of the alloy powder of Fe-N containing nanoporous.
3. high-strength bolt according to claim 2, which is characterized in that be containing mass percent in the Aluminum Coating
3%~5% nanoporous Fe-N alloy powder；Optionally, the Aluminum Coating with a thickness of 5 μm~8 μm.
4. high-strength bolt according to claim 1, which is characterized in that impurity described in the medium carbon low alloy steel presses matter
Measuring percentage includes: S < 0.015%, P < 0.015%, O < 0.0015%, N < 0.0020%.
5. high-strength bolt according to claim 1, which is characterized in that the nitrogen oxygen-carbon co-cementation layer includes being set to the spiral shell
The gas permeation diffusion layer of plug body surface and the gas permeation compound layer that layer surface is spread set on the gas permeation；It is optional
, the gas permeation diffusion layer with a thickness of 0.15mm~0.25mm；Optionally, the thickness of the gas permeation compound layer
It is 5 μm~20 μm.
6. the preparation method of high-strength bolt according to any one of claims 1 to 5, which is characterized in that including following step
It is rapid:
By the heating of bolt idiosome made of medium carbon low alloy steel, quenching treatment, the body of bolt is obtained；
The body of bolt is subjected to tempering, and carries out the processing of nitrogen oxygen-carbon co-cementation while the tempering.
7. the preparation method of high-strength bolt according to claim 6, which is characterized in that by the medium carbon low alloy steel system
At the bolt idiosome be heated to 840 DEG C~860 DEG C after quenched using 50 DEG C~60 DEG C of water-bath.
8. the preparation method of high-strength bolt according to claim 6, which is characterized in that the nitrogen oxygen-carbon co-cementation, which is handled, is
It is first passed through air in the tempering, is subsequently passed the mixed gas that bleeding agent after ammonia, air and atomization forms, it is described
The volume ratio of ammonia described in mixed gas and the air is 5~7:1, ammonia described in the mixed gas and the air
Total volume and the bleeding agent volume ratio be 1:35 × 10-6~50 × 10-6；The atomic ratio of C, H, O are in the bleeding agent
10~14:40~44:10~12.
9. the preparation method of high-strength bolt according to claim 8, which is characterized in that the temperature of the tempering is
550 DEG C~650 DEG C；Optionally, be passed through when the tempering air time and be passed through mixed gas time ratio be 1:2~
4。
10. the preparation method of high-strength bolt according to claim 6, which is characterized in that the step further include: by institute
It states the body of bolt and carries out tempering, and after carrying out the processing of nitrogen oxygen-carbon co-cementation while the tempering, it is cooling and coat and contain
There is the Aluminum Coating of nanoporous Fe-N alloy powder, dries.
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| CN111763879A (en) * | 2020-06-04 | 2020-10-13 | 宁波浩渤工贸有限公司 | Preparation method of flat washer for high-strength bolt |
| CN111962016A (en) * | 2020-09-03 | 2020-11-20 | 江苏良川科技发展有限公司 | Preparation method of steel lamp pole |
| CN112359288A (en) * | 2020-11-16 | 2021-02-12 | 广东理标信息科技有限公司 | Production process of strong magnetic bolt |
| CN112522492A (en) * | 2020-10-28 | 2021-03-19 | 浙江自紧王机械有限公司 | Self-tightening nut and heat treatment process of self-tightening gasket |
| CN113106343A (en) * | 2021-04-02 | 2021-07-13 | 大冶特殊钢有限公司 | Bolted steel for ocean platform and manufacturing method thereof |
| CN113263298A (en) * | 2021-06-09 | 2021-08-17 | 苏州英德力电子科技有限公司 | Processing technology of high-strength bolt for steel mesh frame bolt ball joint |
| CN114790537A (en) * | 2022-04-27 | 2022-07-26 | 宁波金鼎紧固件有限公司 | High-performance engineering fastener material and production method thereof |
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| CN109913737B (en) | 2020-04-28 |
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