CN106086680B - A kind of high strength nut and its processing method - Google Patents
A kind of high strength nut and its processing method Download PDFInfo
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- CN106086680B CN106086680B CN201610680568.1A CN201610680568A CN106086680B CN 106086680 B CN106086680 B CN 106086680B CN 201610680568 A CN201610680568 A CN 201610680568A CN 106086680 B CN106086680 B CN 106086680B
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
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- 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
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- 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
- C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/46—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing oxalates
- C23C22/47—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing oxalates containing also phosphates
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Abstract
The present invention relates to a kind of high strength nut and its processing method, belongs to nut processing technique field.It is made up of the steel alloy of high intensity, and the steel alloy is made up of the chemical composition of following mass percent：C0.08 0.15%, Mn：1.3 1.6%, Cr3.0 3.2%, Ni0.15 0.25%, Mo0.2 0.3%, B0.2 0.3%, V0.002 0.008%, Ti0.08 0.25%, Al0.25 0.6%, Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.The high strength nut first passes through the processing such as spheroidizing, phosphatization using the rational steel alloy of compatibility, reprocessing shaping, carburizing heat treatment and blackening process are made, the due requirement of high strength nut steel can not only be reached in intensity and hardness, also drastically increase the corrosion resistance of high strength nut.
Description
Technical field
The present invention relates to a kind of high strength nut and its processing method, belongs to nut processing technique field.
Background technology
Fastener fastener is commercially also referred to as standard component, is to fasten two or more parts (or component)
It is connected to become the general name of used a kind of machine components during an entirety.Its feature is that description is various, performance purposes
It is different and standardization, seriation, unitized strong.Fastener is most widely used mechanical basic part, demand
It is very big.Conventional fastener includes bolt, screw, nut etc..
Nut is nut, is to use the frictional force between nuts and bolt to carry out self-locking, but this in dynamic loading
The reliability of self-locking will reduce.When in use, environmental difference is larger for nut, and having under low temperature, high temperature, acid-base environment can
Can, and nut is when in use, it is necessary to bear larger stress, therefore nut needs preferable performance.
Nut of the prior art typically all uses bulk metal structure, not only quality weight, and materials cost is high, and performance one
As, as equipment securing member, shared weight is bigger in a device, is unfavorable for reducing the total quality of equipment, influences to give birth to
The links such as produce, transport and use.
The content of the invention
The defects of present invention is present in prior art, there is provided a kind of intensity, hardness are higher, and wearability, precision are preferable
Nut.
The above-mentioned purpose of the present invention can be carried out by the following technical programs：A kind of high strength nut, the nut
It is made up of the steel alloy of high intensity, described steel alloy is made up of the chemical composition of following mass percent：C：0.08%-
0.15%, Mn：1.30%-1.60%, Cr：3.00%-3.20%, Ni：0.15%-0.25%, Mo：0.20%-0.30%, B：
0.20%-0.30%, V：0.002%-0.008%, Ti：0.08-0.25%, Al：0.25%-0.60%, Si≤0.10%, S
≤ 0.030%, P≤0.030%, remaining is Fe.
C：0.08%-0.15%, Cr：3.20-3.50%, Ni：0.15-0.25%, Mo：0.20%-0.30%, B：
0.20-0.30%, Ti：0.20-0.30%, Al：0.25%-0.30%,
First, the present invention reduces carbon (C) on the basis of common high strength nut steel, and adds high level
Chromium, while nickel (Ni), boron (B), vanadium (V), titanium (Ti), aluminium (Al) are with the addition of to make up intensity and quenching degree caused by carbon drop
Loss, the quenching degree of nut steel alloy is further improved, and then improve the hardness and intensity of nut steel alloy.Secondly, although silicon
(Si) there is slight invigoration effect, also can slightly improve the toughness of steel, when being worked with the molybdenum in steel alloy, nickel one, effect is more
It is good, but excessive silicon can have a strong impact on the welding performance of steel, therefore, nut steel of the present invention suitably reduces the content of silicon, will
The content of silicon is controlled within 0.10%.Furthermore nut steel of the present invention not only eliminates the Cu in impurity, also additionally with the addition of nickel
(Ni), boron (B), vanadium (V), titanium (Ti), aluminium (Al), to crystal grain thinning, found through constantly experiment, boron (B), vanadium (V), titanium
(Ti), four kinds of elements of aluminium (Al) add caused synergy together, can further increase substantially nut steel alloy
Impact flexibility, intensity and wearability.Finally, nut steel alloy of the present invention is reduced in nut steel alloy by reducing S contents
Non-metallic inclusion, improve the toughness plasticity of steel, nut steel alloy decay resistance and intensity improved, by reducing P content
And then the resistance of deformation of nut steel is reduced, while reduce P, S and mitigate embrittlement of grain boundaries in the segregation of crystal boundary.Due to chemical composition
Change, its microscopic structure also changes, and nut of the invention can not only reach high strength nut steel in intensity and hardness
Due requirement, also significantly improve the corrosion resistance of nut.
In above-mentioned high strength nut, preferably, the nut is made up of the steel alloy of high intensity, described alloy
Steel is made up of the chemical composition of following mass percent：C：0.10%-0.15%, Mn：1.40%-1.50%, Cr：3.10%-
3.20%, Ni：0.18%-0.25%, Mo：0.22%-0.28%, B：0.23%-0.28%, V：0.005%-0.008%,
Ti：0.10-0.20%, Al：0.30%-0.50%, Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.12%, Mn：
1.45%, Cr：3.15%, Ni：0.22%th, Mo：0.25%, B：0.25%, V：0.006%, Ti：0.15%, Al：0.40%,
Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.10%, Mn：
1.50%, Cr：3.10%, Ni：0.18%th, Mo：0.22%, B：0.28%, V：0.005%, Ti：0.10%, Al：0.50%,
Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.08%, Mn：
1.60%, Cr：3.00%, Ni：0.25%th, Mo：0.20%, B：0.30%, V：0.002%, Ti：0.25%, Al：0.25%,
Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.15%, Mn：
1.30%, Cr：3.20%, Ni：0.15%th, Mo：0.30%, B：0.20%, V：0.008%, Ti：0.08%, Al：0.60%,
Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
It is another object of the present invention to provide a kind of processing method of above-mentioned high strength nut, the processing method bag
Include following steps：
S1, pre-treatment：The steel alloy raw material of above-mentioned chemical composition is first subjected to acid pickling and rust removing, air-dried, after then air-drying
Raw material carry out spheroidizing processing at 730-760 DEG C, carry out phosphorating treatment and wire drawing after samming processing 5h-8h；
S2, shaping：Raw material after above-mentioned processing is formed in the presence of the upset force to the shape needed for nut, and successively
Progress turning, groove milling, thread rolling obtain nut semi-finished product；
S3, heat treatment：Nut semi-finished product are incubated 30-60min at 510-520 DEG C, are warming up to 900-920 DEG C of insulation 20-
40min, fast cooling to 500-520 DEG C of insulation 70-100min, is heated to 840-860 DEG C of insulation 40-80min, is subsequently cooled to
Room temperature；
S4, blackening process：It is in pH value after oil removing, acid pickling and rust removing by the above-mentioned nut semi-finished product after Overheating Treatment
Room temperature blackening handles 10-20 minutes under conditions of 1.5-3.5, through over cleaning after room temperature blackening processing processing, takes off immediately after
High strength nut finished product is produced after water seal processing.
The processing method of nut of the present invention first by used in nut steel alloy carry out pre-treatment, including spheroidizing processing,
Phosphorating treatment etc., the type of being subsequently processed into obtains nut, and the hardness for further improving nut is heat-treated by carburizing, makes case depth
Reach 0.2-0.4mm, form black water organic coating on nut surface finally by from blackening process, make its film layer that there is pole
Strong adhesive force, lubricity, delustring, heat resistance, corrosion resistance, and then significantly improve the case hardness, intensity, corrosion resistance of nut.
Dehydration Seal treatment is carried out after blackening process again, improves the corrosion resistance and case hardness of film obtained by blackening process.
Nut blackening process of the present invention is carried out under normal temperature condition, and blackening process can make high strength nut of the present invention
Surface obtains the conversion film for having corrosion protection concurrently and decorating dual-use function.Room temperature blackening processing, which has, saves the energy and time, operation side
Just the advantages of, cost is relatively low, non-environmental-pollution.The tight nut black film film performance of high intensity with the change of pH value in hair blackening liquid and
The situation of change.I.e. when pH value is relatively low right, fast for film formation reaction, film layer is loose, when pH value is higher, because film formation reaction becomes
Slowly, when the time that blacks is identical, degraded appearance, black film is relatively thin but fine and close, adhesion rise but corrosion resistance decline.Room temperature blackening
Suitable pH value range is：PH=1.5~3.5.Under conditions of hair blackening liquid pH value is certain, room temperature blackening film film performance and hair
The black time is relevant.Time is too short, and black film is thin, and film formation reaction is incomplete, and corrosion resistance is poor；Overlong time, black film is too thick, attachment
Thing is more, and adhesion is poor.
Preferably, the blackening agent for surface of the blackening process is：Cupric sulfate pentahydrate：5-6g/L；Selenium dioxide：3-5g/L；It is auxiliary
Furtherance film phosphoric acid 5-6g/L；Speed adjusts tartrate 8-10g/L；PH oxalic acid：4-5g/L；Nigrescence stabilizer lemon
Sour 6-8ml/L.
Preferably, described dehydration Seal treatment is carried out in silicate water paint, the solidification temperature of Seal treatment
For 340-350 DEG C, hardening time 4-8min.
In summary, the present invention reduces carbon (C) and silicon (Si) content on the basis of common high strength alloy steel, no
The Cu in Mn and impurity is only eliminated, nickel (Ni), boron (B), vanadium (V), titanium (Ti), aluminium (Al) are also additionally with the addition of, to thin
Change crystal grain, found through constantly experiment, four kinds of boron (B), vanadium (V), titanium (Ti), aluminium (Al) elements add caused collaboration and made together
With, and the content of other chemical compositions is further optimized, due to the change of chemical composition, its microscopic structure also changes.
And the processing such as spheroidizing, phosphatization is first passed through using the steel alloy used in the rational nut of above-mentioned compatibility, reprocessing is molded to obtain spiral shell
Female semi-finished product, the nut of the present invention is then made by specific carburizing heat treatment and blackening process, makes the nut of the present invention not
The due requirement of high strength nut steel can only be reached in intensity and hardness, as hardness reaches 24HRC, case hardness reaches 31HRC,
Also drastically increase the corrosion resistance for improving nut.
Embodiment
It is the specific embodiment of the present invention below, technical scheme is further described, but the present invention is simultaneously
It is not limited to these embodiments.
A kind of high strength nut, the nut are made up of the steel alloy of high intensity, and described steel alloy is by following quality hundred
The chemical composition composition of fraction：C：0.08%-0.15%, Mn：1.30%-1.60%, Cr：3.00%-3.20%, Ni：
0.15%-0.25%, Mo：0.20%-0.30%, B：0.20%-0.30%, V：0.002%-0.008%, Ti：0.08-
0.25%, Al：0.25%-0.60%, Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Preferably, the nut is made up of the steel alloy of high intensity, described steel alloy is by following mass percent
Chemical composition forms：C：0.10%-0.15%, Mn：1.40%-1.50%, Cr：3.10%-3.20%, Ni：0.18%-
0.25%th, Mo：0.22%-0.28%, B：0.23%-0.28%, V：0.005%-0.008%, Ti：0.10-0.20%, Al：
0.30%-0.50%, Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.12%, Mn：
1.45%, Cr：3.15%, Ni：0.22%th, Mo：0.25%, B：0.25%, V：0.006%, Ti：0.15%, Al：0.40%,
Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.10%, Mn：
1.50%, Cr：3.10%, Ni：0.18%th, Mo：0.22%, B：0.28%, V：0.005%, Ti：0.10%, Al：0.50%,
Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.08%, Mn：
1.60%, Cr：3.00%, Ni：0.25%th, Mo：0.20%, B：0.30%, V：0.002%, Ti：0.25%, Al：0.25%,
Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
Further preferably, described steel alloy is made up of the chemical composition of following mass percent：C：0.15%, Mn：
1.30%, Cr：3.20%, Ni：0.15%th, Mo：0.30%, B：0.20%, V：0.008%, Ti：0.08%, Al：0.60%,
Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe.
The processing method of above-mentioned nut comprises the following steps：
S1, pre-treatment：The steel alloy raw material of above-mentioned chemical composition is first subjected to acid pickling and rust removing, air-dried, after then air-drying
Raw material carry out spheroidizing processing at 730-760 DEG C, carry out phosphorating treatment and wire drawing after samming processing 5h-8h；
S2, shaping：Raw material after above-mentioned processing is formed in the presence of the upset force to the shape needed for nut, and successively
Progress turning, groove milling, thread rolling obtain nut semi-finished product；
S3, heat treatment：Nut semi-finished product are incubated 30-60min at 510-520 DEG C, are warming up to 900-920 DEG C of insulation 20-
40min, fast cooling to 500-520 DEG C of insulation 70-100min, is heated to 840-860 DEG C of insulation 40-80min, is subsequently cooled to
Room temperature；
S4, blackening process：It is in pH value after oil removing, acid pickling and rust removing by the above-mentioned nut semi-finished product after Overheating Treatment
Room temperature blackening handles 10-20 minutes under conditions of 1.5-3.5, through over cleaning after room temperature blackening processing processing, takes off immediately after
High strength nut finished product is produced after water seal processing.
Preferably, the blackening agent for surface of the blackening process is：Cupric sulfate pentahydrate：5-6g/L；Selenium dioxide：3-5g/L；It is auxiliary
Furtherance film phosphoric acid 5-6g/L；Speed adjusts tartrate 8-10g/L；PH oxalic acid：4-5g/L；Nigrescence stabilizer lemon
Sour 6-8ml/L.
Preferably, described dehydration Seal treatment is carried out in silicate water paint, the solidification temperature of Seal treatment
For 340-350 DEG C, hardening time 4-8min.
Embodiment 1：A kind of high strength nut, is process as follows：
Pre-treatment：Steel alloy used in the nut of chemical composition as described below is first subjected to acid pickling and rust removing, air-dried, then by wind
Raw material after dry carries out spheroidizing processing at 740 DEG C, and phosphorating treatment and wire drawing are carried out after samming processing 6h；Described alloy
Steel is made up of the chemical composition of following mass percent：C：0.12%, Mn：1.45%, Cr：3.15%, Ni：0.22%th, Mo：
0.25%, B：0.25%, V：0.006%, Ti：0.15%, Al：0.40%, Si≤0.10%, S≤0.030%, P≤
0.030%, remaining is Fe；
Shaping：Raw material after above-mentioned processing is formed in the presence of the upset force to the shape needed for nut, and entered successively
Driving is cut, groove milling, thread rolling obtain nut semi-finished product；
Heat treatment：Nut semi-finished product are incubated 45min at 515 DEG C, are warming up to 910 DEG C of insulation 30min, fast cooling is extremely
510 DEG C of insulation 80min, 850 DEG C of insulation 60min are heated to, are subsequently cooled to room temperature；
Blackening process：By the above-mentioned nut semi-finished product after Overheating Treatment after oil removing, acid pickling and rust removing pH value be 2.5
Under conditions of room temperature blackening handle 15 minutes, room temperature blackening processing processing after through over cleaning, make dehydration Seal treatment immediately after
After produce high strength nut finished product.Wherein, the blackening agent for surface of blackening process is：Cupric sulfate pentahydrate：5-6g/L；Selenium dioxide：3-5g/
L；Auxiliary film former phosphoric acid 5-6g/L；Speed adjusts tartrate 8-10g/L；PH oxalic acid：4-5g/L；Nigrescence stabilizer
Citric acid 6-8ml/L；Dehydration Seal treatment is carried out in silicate water paint, and the solidification temperature of Seal treatment is 345 DEG C, Gu
The change time is 5min.
Embodiment 2：A kind of high strength nut, is process as follows：
Pre-treatment：Steel alloy used in the nut of chemical composition as described below is first subjected to acid pickling and rust removing, air-dried, then by wind
Raw material after dry carries out spheroidizing processing at 750 DEG C, and phosphorating treatment and wire drawing are carried out after samming processing 7h；Described alloy
Steel is made up of the chemical composition of following mass percent：C：0.10%, Mn：1.50%, Cr：3.10%, Ni：0.18%th, Mo：
0.22%, B：0.28%, V：0.005%, Ti：0.10%, Al：0.50%, Si≤0.10%, S≤0.030%, P≤
0.030%, remaining is Fe；
Shaping：Raw material after above-mentioned processing is formed in the presence of the upset force to the shape needed for nut, and entered successively
Driving is cut, groove milling, thread rolling obtain nut semi-finished product；
Heat treatment：Nut semi-finished product are incubated 50min at 505 DEG C, are warming up to 905 DEG C of insulation 35min, fast cooling is extremely
505 DEG C of insulation 90min, 845 DEG C of insulation 70min are heated to, are subsequently cooled to room temperature；
Blackening process：After oil removing, acid pickling and rust removing it is 2 in pH value by above-mentioned nut semi-finished product after Overheating Treatment
Under the conditions of room temperature blackening handle 17 minutes, through over cleaning after room temperature blackening processing processing, after making dehydration Seal treatment immediately after
Produce high strength nut finished product.Wherein, the blackening agent for surface of blackening process is：Cupric sulfate pentahydrate：5-6g/L；Selenium dioxide：3-5g/L；
Auxiliary film former phosphoric acid 5-6g/L；Speed adjusts tartrate 8-10g/L；PH oxalic acid：4-5g/L；Nigrescence stabilizer lemon
Lemon acid 6-8ml/L；Dehydration Seal treatment is carried out in silicate water paint, and the solidification temperature of Seal treatment is 348 DEG C, solidification
Time is 6min.
Embodiment 3：A kind of high strength nut, is process as follows：
Pre-treatment：Steel alloy used in the nut of chemical composition as described below is first subjected to acid pickling and rust removing, air-dried, then by wind
Raw material after dry carries out spheroidizing processing at 730 DEG C, and phosphorating treatment and wire drawing are carried out after samming processing 8h；Described alloy
Steel is made up of the chemical composition of following mass percent：C：0.08%, Mn：1.60%, Cr：3.00%, Ni：0.25%th, Mo：
0.20%, B：0.30%, V：0.002%, Ti：0.25%, Al：0.25%, Si≤0.10%, S≤0.030%, P≤
0.030%, remaining is Fe；
Shaping：Raw material after above-mentioned processing is formed in the presence of the upset force to the shape needed for nut, and entered successively
Driving is cut, groove milling, thread rolling obtain nut semi-finished product；
Heat treatment：Nut semi-finished product are incubated 30min at 520 DEG C, are warming up to 920 DEG C of insulation 20min, fast cooling is extremely
520 DEG C of insulation 70min, 860 DEG C of insulation 40min are heated to, are subsequently cooled to room temperature；
Blackening process：By the above-mentioned nut semi-finished product after Overheating Treatment after oil removing, acid pickling and rust removing pH value be 3.5
Under conditions of room temperature blackening handle 10 minutes, room temperature blackening processing processing after through over cleaning, make dehydration Seal treatment immediately after
After produce high strength nut finished product.Wherein, the blackening agent for surface of blackening process is：Cupric sulfate pentahydrate：5-6g/L；Selenium dioxide：3-5g/
L；Auxiliary film former phosphoric acid 5-6g/L；Speed adjusts tartrate 8-10g/L；PH oxalic acid：4-5g/L；Nigrescence stabilizer
Citric acid 6-8ml/L；Dehydration Seal treatment is carried out in silicate water paint, and the solidification temperature of Seal treatment is 350 DEG C, Gu
The change time is 4min.
Embodiment 4：A kind of high strength nut, is process as follows：
Pre-treatment：Steel alloy used in the nut of chemical composition as described below is first subjected to acid pickling and rust removing, air-dried, then by wind
Raw material after dry carries out spheroidizing processing at 760 DEG C, and phosphorating treatment and wire drawing are carried out after samming processing 5h；Described alloy
Steel is made up of the chemical composition of following mass percent：C：0.15%, Mn：1.30%, Cr：3.20%, Ni：0.15%th, Mo：
0.30%, B：0.20%, V：0.008%, Ti：0.08%, Al：0.60%, Si≤0.10%, S≤0.030%, P≤
0.030%, remaining is Fe；
Shaping：Raw material after above-mentioned processing is formed in the presence of the upset force to the shape needed for nut, and entered successively
Driving is cut, groove milling, thread rolling obtain nut semi-finished product；
Heat treatment：Nut semi-finished product are incubated 60min at 510 DEG C, are warming up to 900 DEG C of insulation 40min, fast cooling is extremely
500 DEG C of insulation 100min, 840 DEG C of insulation 80min are heated to, are subsequently cooled to room temperature；
Blackening process：By the above-mentioned nut semi-finished product after Overheating Treatment after oil removing, acid pickling and rust removing pH value be 1.5
Under conditions of room temperature blackening handle 20 minutes, room temperature blackening processing processing after through over cleaning, make dehydration Seal treatment immediately after
After produce high strength nut finished product.Wherein, the blackening agent for surface of blackening process is：Cupric sulfate pentahydrate：5-6g/L；Selenium dioxide：3-5g/
L；Auxiliary film former phosphoric acid 5-6g/L；Speed adjusts tartrate 8-10g/L；PH oxalic acid：4-5g/L；Nigrescence stabilizer
Citric acid 6-8ml/L；Dehydration Seal treatment is carried out in silicate water paint, and the solidification temperature of Seal treatment is 340 DEG C, Gu
The change time is 8min.
To the tensile strength sigma b of embodiment 1-4 high strength nut, tensile strength σ s, hardness HRC, case hardness HRC, receipts
Shrinkage δ, elongation ψ and toughness (impact absorbing energy Akv) are detected, and testing result is as shown in table 1：
Table 1：Embodiment 1-4 nut and the property for passing through nut made from common processing methods with 42CrMo in the prior art
Can test result
As it can be seen from table 1 the nut of the present invention not only can reach high strength nut steel in intensity and hardness and should have
Requirement, nut hardness is reached 24HRC, case hardness reaches more than 31HRC, also significantly improves the corrosion resistance of nut.
Above example is merely to illustrate technical scheme rather than limiting the scope of the invention, although ginseng
The present invention is explained in detail according to preferred embodiment, it will be understood by those within the art that, can be to the present invention's
Technical scheme is modified or equivalent substitution, without departing from the spirit and scope of technical solution of the present invention.
Claims (3)
- A kind of 1. high strength nut, it is characterised in that the nut is made up of the steel alloy of high intensity, described steel alloy by with The chemical composition composition of lower mass percent：C：0.08%-0.15%, Mn：1.30%-1.60%, Cr：3.00%-3.20%, Ni：0.15%-0.25%, Mo：0.20%-0.30%, B：0.20%-0.30%, V：0.002%-0.008%, Ti： 0.08%-0.25%, Al：0.25%-0.60%, Si≤0.10%, S≤0.030%, P≤0.030%, remaining is Fe；The processing method of the high strength nut comprises the following steps：S1, pre-treatment：The steel alloy raw material of chemical composition as above is first subjected to acid pickling and rust removing, air-dried, then by the original after air-drying Material carries out spheroidizing processing at 730-760 DEG C, and phosphorating treatment and wire drawing are carried out after samming processing 5h-8h；S2, shaping：Raw material after above-mentioned processing is formed in the presence of the upset force to the shape needed for nut, and carried out successively Turning, groove milling, thread rolling obtain nut semi-finished product；S3, heat treatment：Nut semi-finished product are incubated 30-60min at 510-520 DEG C, are warming up to 900-920 DEG C of insulation 20- 40min, fast cooling to 500-520 DEG C of insulation 70-100min, is heated to 840-860 DEG C of insulation 40-80min, is subsequently cooled to Room temperature；S4, blackening process：After oil removing, acid pickling and rust removing it is 1.5- in pH value by the above-mentioned nut semi-finished product after Overheating Treatment Room temperature blackening handles 10-20 minutes under conditions of 3.5, through over cleaning after room temperature blackening processing, makees immediately after at dehydration closing High strength nut finished product is produced after reason；The blackening agent for surface of the blackening process is：Cupric sulfate pentahydrate：5-6g/L；Selenium dioxide：3- 5g/L；Auxiliary film former phosphoric acid 5-6g/L；Speed adjusts tartrate 8-10g/L；PH oxalic acid：4-5g/L；Black steady Determine agent citric acid 6-8ml/L.
- 2. high strength nut according to claim 1, it is characterised in that the nut is made up of the steel alloy of high intensity, Described steel alloy is made up of the chemical composition of following mass percent：C：0.10%-0.15%, Mn：1.40%-1.50%, Cr：3.10%-3.20%, Ni：0.18%-0.25%, Mo：0.22%-0.28%, B：0.23%-0.28%, V：0.005%- 0.008%, Ti：0.10%-0.20%, Al：0.30%-0.50%, Si≤0.10%, S≤0.030%, P≤0.030%, its Remaining is Fe.
- 3. high strength nut according to claim 1, it is characterised in that described dehydration Seal treatment is in the water-based painting of silicate Carried out in material, the solidification temperature of Seal treatment is 340-350 DEG C, hardening time 4-8min.
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| CN107574381A (en) * | 2017-09-18 | 2018-01-12 | 张家港保税区通勤精密机械有限公司 | A kind of high intensity engine sump tank oil discharge screw |
| CN109182906A (en) * | 2018-09-30 | 2019-01-11 | 宁波市镇海甬鼎紧固件制造有限公司 | A kind of high temperature resistance and high strength nut and its production method |
| CN109648266B (en) * | 2018-12-29 | 2022-02-08 | 山东腾达紧固科技股份有限公司 | Rectangular adjusting nut machining process |
| CN109894813A (en) * | 2019-02-20 | 2019-06-18 | 海盐兆丰紧固件有限公司 | A kind of manufacturing process of nut |
| CN111607733B (en) * | 2020-06-01 | 2023-06-02 | 宁波瑞国精机工业有限公司 | Antitheft nut and processing technology thereof |
| CN112680584B (en) * | 2020-11-27 | 2022-08-16 | 上海宏挺紧固件制造有限公司 | Nylon head screw and processing method thereof |
| CN113462976B (en) * | 2021-06-29 | 2022-05-13 | 钢铁研究总院 | High-fatigue-strength bolt steel, preparation method thereof and bolt manufacturing method |
| CN114393161B (en) * | 2021-12-31 | 2024-03-26 | 太仓超亿紧固件有限公司 | Surface treatment process for high-strength corrosion-resistant screw |
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| JP2007191781A (en) * | 2005-12-19 | 2007-08-02 | Kobe Steel Ltd | Steel sheet having superior resistance to propagation of fatigue crack |
| CN102899650A (en) * | 2012-10-23 | 2013-01-30 | 自贡勃生表面技术推广有限公司 | Steel normal-temperature blackening solution composite film-forming accelerator, steel normal-temperature blackening solution and preparation method of steel normal-temperature blackening solution |
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