CN109182906A - A kind of high temperature resistance and high strength nut and its production method - Google Patents
A kind of high temperature resistance and high strength nut and its production method Download PDFInfo
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- CN109182906A CN109182906A CN201811153294.6A CN201811153294A CN109182906A CN 109182906 A CN109182906 A CN 109182906A CN 201811153294 A CN201811153294 A CN 201811153294A CN 109182906 A CN109182906 A CN 109182906A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
- C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C12/00—Solid state diffusion of at least one non-metal element other than silicon and at least one metal element or silicon into metallic material surfaces
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Abstract
The invention discloses a kind of high temperature resistance and high strength nuts, and the chemical component of the nut is by mass percentage are as follows: C:0.03~0.07, Si:0.3~0.6, Mn:1.8~2.1, P :≤0.003, S :≤0.005, Ni:12.0~15.0, Cr:12.5~15.2, Ti:4.5~5.3, Al :≤0.05, Mo:1.1~1.6, Ta:0.01~0.03, Nb:0.03~0.05, V:0.02~0.10, surplus Fe and inevitable impurity.High temperature resistance and high strength nut of the invention meets long-term use temperature and is 700~800 DEG C and requires the particular industry use occasion of high-tensile.A kind of production method of high temperature resistance and high strength nut is also disclosed in the present invention.
Description
Technical field
The present invention relates to machanical fastener technical fields, more particularly to a kind of high temperature resistance and high strength nut and its production
Method.
Background technique
Nut is exactly nut, is threaded together the part for playing the role of fastening, all manufacturing machines with bolt or screw rod
Tool must a kind of element according to the difference of material, be divided into several big types such as carbon steel, stainless steel, non-ferrous metal.Nut nut
As mating fastener, large-scale extensive use has been obtained, but in some particular applications, such as aerospace, core
Industry, oil refining, high-temperature fuel cell etc. are many to need the fields that use under long term high temperature environment, the spiral shell on existing market
Cap nut is difficult to meet its requirement.
Usually, general high-strength nut, for normal use temperature at 150~200 DEG C, performance does not have too big change
Change, if high-performance will be lower again, substantially every high 50 DEG C of reduced performances 5%, when the temperature of temperature height to its tempering heat treatment
Spend (480 DEG C or so) will full annealing, lose intensity.Therefore, it is necessary to a kind of nuts of high temperature resistance and high strength of development & production to answer
For above-mentioned special occasions.
The high temperature resistant nut of prior art production, due to its selected materials and production technology difference, nut produced is each
Have the advantages that its is different, but there are still different degrees of defects.
Summary of the invention
In place of the above the deficiencies in the prior art, one of main object of the present invention is to provide a kind of high-temperature-resistant high
Nut is spent, the second purpose is to provide a kind of method of new production high temperature resistance and high strength nut, overcome of the existing technology
Shortcoming, to meet the requirement for the high-temp and high-strength nut that special occasions uses.
To achieve the above objectives, the technical solution adopted by the present invention are as follows:
A kind of high temperature resistance and high strength nut, the chemical component of the nut is by mass percentage are as follows: C:0.03~0.07,
Si:0.3~0.6, Mn:1.8~2.1, P :≤0.003, S :≤0.005, Ni:12.0~15.0, Cr:12.5~15.2, Ti:
4.5~5.3, Al :≤0.05, Mo:1.1~1.6, Ta:0.01~0.03, Nb:0.03~0.05, V:0.02~0.10, surplus
Fe and inevitable impurity, and the content of above-mentioned each chemical component must simultaneously meet following relationship: Mo equivalent > 1.9%, Cr work as
Measure > 14.1%, Mo equivalent=Mo+ (Cr+Si)/15+0.32V-0.8Al；Cr equivalent=Cr+1.21 (Mo+Si)+0.66V-
0.85Al, Ta+Nb+V≤0.15%；Wherein, the symbol of element indicates mass percentage content of the element in bolt.
Preferably, the chemical component of the nut is by mass percentage are as follows: C:0.052, Si:0.5, Mn:1.98, P:
0.001, S:0.002, Ni:13.6, Cr:13.5, Ti:4.75, Al:0.032, Mo:1.35, Ta:0.022, Nb:0.042, V:
0.08, surplus Fe and inevitable impurity.
Preferably, the chemical component of the nut is by mass percentage are as follows: C:0.042, Si:0.4, Mn:1.82, P:
0.002, S:0.004, Ni:14.5, Cr:14.2, Ti:4.91, Al:0.04, Mo:1.45, Ta:0.016, Nb:0.048, V:
0.06, surplus Fe and inevitable impurity.
Correspondingly, a kind of production method of high temperature resistance and high strength nut, comprising the following steps:
S1 melting: required raw material is weighed by the mass percent of each chemical component of nut, in Medium frequency induction after high temperature melting
Melting is carried out in furnace；
S2 refining: being added deoxidier and carry out pre-deoxidation, is subsequently sent to refining furnace refining, strengthens deoxidation, then -0.1MPa's
Fruit storage is carried out under vacuum degree, obtains refined molten steel；The deoxidier is made of Mn, Si and Al, and quality percentage contains
The ratio of amount is 15~20:55~60:20~30；
S3 casting: refined molten steel is cast under ultrasonic wave effect, and cast temperature is 1520~1570 DEG C, Slow cooling
After obtain casting green body, wherein the frequency of ultrasonic wave be 40~60KHz, control casting green body grain size number be 4~6 grades；
In refined molten steel casting process of setting, apply ultrasonic wave booster action, the main high-energy and its cavitation for utilizing ultrasonic vibration
Effect greatly improves the degree of grain refinement of casting green body by dither effect and makes microstructure homogenization and purification
Effect it is more preferable；
S4 solid solution: casting green body 1200 ± 50 DEG C at a temperature of carry out solution treatment, keep the temperature 1.5~3h, then air
It is cooling, obtain supersaturated solid solution；After higher temperature solid solution, various precipitated phases all gradually dissolve, while crystal grain is grown up, and mention
High its high-temperature and durable stability and creep-resistant property；
S5 molding: solid solution is subjected to forging operation on forging machine, obtains crude product nut；
S6 is once heat-treated: crude product nut is successively obtained semi-finished product after surface layer composite cementation, quenching and tempering
Nut blank, wherein hardening heat is 1080~1150 DEG C, keeps the temperature 3~5h, and tempering temperature is 820~830 DEG C, keeps the temperature 3~5h；
S7 finishing: semi-finished product nut blank is refined to design technology size, obtains finished product nut；
S8 cleaning: the mode that finished product nut carries out ultrasonic wave added pickling is cleaned；
S9 secondary heat treatment: the high temperature resistance and high strength nut is obtained after Wetted constructures, wherein aging temperature
It is 700~720 DEG C, keeps the temperature 6~12h.
By heat treatment methods different twice, the uniformity of crystal grain is further increased, ensure that the reinforcing of alloying element
Effect, to improve nut high temperature endurance performance and nut fatigue life.
Preferably, the surface layer composite cementation processing in the step S6: using crude product bolt as tantalum plate cathode, pure tantalum plate conduct
Tantalum plate anode, plasma heating furnace are pumped into the vacuum state of -0.1MPa, start to discharge after being passed through argon gas, and discharge 20~30min；It connects
Tantalum plate power supply when being warming up to 800~850 DEG C, keeps 30~50Pa of operating air pressure, applies voltage respectively in cathode and anode-side
300~500V and 580~800V starts the preparation for carrying out crude product bolt surface tantalum alloy layer, seeps 1~2h of tantalum time；Seep tantalum knot
Crude product bolt is placed in the boronising kettle equipped with boriding medium by Shu Hou, is warming up to 800~1000 DEG C, keeps the temperature 6~12h, control cooling
5~10 DEG C/h of speed allows to cool to room temperature, obtains B+Ta compisite seeping layer crude product bolt.It is true by plasma by crude product bolt
After sky seeps tantalum and chemical Bononizing pretreatment, change crude product list of bolts layer chemical component, thus change crude product bolt texture and
Corresponding alloy property.
Amorphous boron of the boriding medium by mass percent for 35~45% crystalline state boron and 55~65% forms.
Beneficial effects of the present invention:
The present invention by harsh experiment, the preferably content of nut each element, using the casting of ultrasonic wave added high temperature, refining,
The method of high temperature solid solution and two-step thermal processing enhances effect of each element in nut steel alloy, improves nut steel alloy
Tensile strength, obtained nut is suitable for special occasions, the long-term use temperature such as high temperature resistant, impact, bending and top load and exists
Nut comprehensive performance will not change under conditions of 700~800 DEG C.
Specific embodiment
It is described below for disclosing the present invention so that those skilled in the art can be realized the present invention.It is excellent in being described below
Embodiment is selected to be only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.
Embodiment 1
A kind of high temperature resistance and high strength nut, the chemical component of the nut is by mass percentage are as follows: C:0.052, Si:
0.5, Mn:1.98, P:0.001, S:0.002, Ni:13.6, Cr:13.5, Ti:4.75, Al:0.032, Mo:1.35, Ta:
0.022, Nb:0.042, V:0.08, surplus Fe and inevitable impurity.
Correspondingly, the production method of the high temperature resistance and high strength nut, comprising the following steps:
S1 melting: required raw material is weighed by the mass percent of each chemical component of nut, in Medium frequency induction after high temperature melting
Melting is carried out in furnace；
S2 refining: being added deoxidier and carry out pre-deoxidation, is subsequently sent to refining furnace refining, strengthens deoxidation, then -0.1MPa's
Fruit storage is carried out under vacuum degree, obtains refined molten steel；The deoxidier is made of Mn, Si and Al, and quality percentage contains
The ratio of amount is 16:58:26；
S3 casting: refined molten steel is cast under ultrasonic wave effect, and cast temperature is 1520 DEG C, is obtained after Slow cooling
Casting green body, wherein the frequency of ultrasonic wave is 40KHz；
S4 solid solution: casting green body 1200 DEG C at a temperature of carry out solution treatment, keep the temperature 1.5h, then air is cooling, obtains
To supersaturated solid solution；
S5 molding: solid solution is subjected to forging operation on forging machine, obtains crude product nut；
S6 is once heat-treated: crude product nut is successively obtained semi-finished product after surface layer composite cementation, quenching and tempering
Nut blank, wherein hardening heat is 1080 DEG C, keeps the temperature 3h, and tempering temperature is 820 DEG C, keeps the temperature 3h；
S7 finishing: semi-finished product nut blank is refined to design technology size, obtains finished product nut；
S8 cleaning: the mode that finished product nut carries out ultrasonic wave added pickling is cleaned；
S9 secondary heat treatment: the high temperature resistance and high strength nut is obtained after Wetted constructures, wherein aging temperature
It is 700 DEG C, keeps the temperature 6h.
Surface layer composite cementation processing in the step S6: using crude product bolt as tantalum plate cathode, pure tantalum plate is as tantalum plate sun
Pole, plasma heating furnace are pumped into the vacuum state of -0.1MPa, start to discharge after being passed through argon gas, and discharge 20min；Tantalum plate power supply is connected, is risen
When temperature is to 800 DEG C, operating air pressure 30Pa is kept, applies voltage 300V and 580V respectively in cathode and anode-side, starts to carry out thick
Tantalum time 1h is seeped in the preparation of product bolt surface tantalum alloy layer；After seeping tantalum, crude product bolt is placed in the boronising equipped with boriding medium
In kettle, 800 DEG C are warming up to, keeps the temperature 12h, control 5 DEG C/h of cooling velocity allows to cool to room temperature.
Embodiment 2
A kind of high temperature resistance and high strength nut, the chemical component of the nut is by mass percentage are as follows: C:0.042, Si:
0.4, Mn:1.82, P:0.002, S:0.004, Ni:14.5, Cr:14.2, Ti:4.91, Al:0.04, Mo:1.45, Ta:0.016,
Nb:0.048, V:0.06, surplus Fe and inevitable impurity.
Correspondingly, the production method of the high temperature resistance and high strength nut, comprising the following steps:
S1 melting: required raw material is weighed by the mass percent of each chemical component of nut, in Medium frequency induction after high temperature melting
Melting is carried out in furnace；
S2 refining: being added deoxidier and carry out pre-deoxidation, is subsequently sent to refining furnace refining, strengthens deoxidation, then -0.1MPa's
Fruit storage is carried out under vacuum degree, obtains refined molten steel；The deoxidier is made of Mn, Si and Al, and quality percentage contains
The ratio of amount is 20:57:23；
S3 casting: refined molten steel is cast under ultrasonic wave effect, and cast temperature is 1570 DEG C, is obtained after Slow cooling
Casting green body, wherein the frequency of ultrasonic wave is 60KHz；
S4 solid solution: casting green body 1150 DEG C at a temperature of carry out solution treatment, keep the temperature 3h, then air is cooling, obtains
Supersaturated solid solution；
S5 molding: solid solution is subjected to forging operation on forging machine, obtains crude product nut；
S6 is once heat-treated: crude product nut is successively obtained semi-finished product after surface layer composite cementation, quenching and tempering
Nut blank, wherein hardening heat is 1150 DEG C, keeps the temperature 5h, and tempering temperature is 830 DEG C, keeps the temperature 5h；
S7 finishing: semi-finished product nut blank is refined to design technology size, obtains finished product nut；
S8 cleaning: the mode that finished product nut carries out ultrasonic wave added pickling is cleaned；
S9 secondary heat treatment: the high temperature resistance and high strength nut is obtained after Wetted constructures, wherein aging temperature
It is 720 DEG C, keeps the temperature 12h.
Surface layer composite cementation processing in the step S6: using crude product bolt as tantalum plate cathode, pure tantalum plate is as tantalum plate sun
Pole, plasma heating furnace are pumped into the vacuum state of -0.1MPa, start to discharge after being passed through argon gas, and discharge 30min；Tantalum plate power supply is connected, is risen
When temperature is to 850 DEG C, operating air pressure 50Pa is kept, applies voltage 500V and 800V respectively in cathode and anode-side, starts to carry out thick
Tantalum time 2h is seeped in the preparation of product bolt surface tantalum alloy layer；After seeping tantalum, crude product bolt is placed in the boronising equipped with boriding medium
In kettle, 1000 DEG C are warming up to, keeps the temperature 12h, control 10 DEG C/h of cooling velocity allows to cool to room temperature.
Embodiment 3
A kind of high temperature resistance and high strength nut, the chemical component of the nut is by mass percentage are as follows: C:0.03, Si:
0.3, Mn:1.8, P:0.003, S:0.002, Ni:12.0, Cr:12.5, Ti:4.5, Al:0.03, Mo:1.1, Ta:0.01, Nb:
0.03, V:0.02, surplus Fe and inevitable impurity.
Correspondingly, the production method of the high temperature resistance and high strength nut, comprising the following steps:
S1 melting: required raw material is weighed by the mass percent of each chemical component of nut, in Medium frequency induction after high temperature melting
Melting is carried out in furnace；
S2 refining: being added deoxidier and carry out pre-deoxidation, is subsequently sent to refining furnace refining, strengthens deoxidation, then -0.1MPa's
Fruit storage is carried out under vacuum degree, obtains refined molten steel；The deoxidier is made of Mn, Si and Al, and quality percentage contains
The ratio of amount is 19:57:24；
S3 casting: refined molten steel is cast under ultrasonic wave effect, and cast temperature is 1550 DEG C, is obtained after Slow cooling
Casting green body, wherein the frequency of ultrasonic wave is 50KHz；
S4 solid solution: casting green body 1250 DEG C at a temperature of carry out solution treatment, keep the temperature 3h, then air is cooling, obtains
Supersaturated solid solution；
S5 molding: solid solution is subjected to forging operation on forging machine, obtains crude product nut；
S6 is once heat-treated: crude product nut is successively obtained semi-finished product after surface layer composite cementation, quenching and tempering
Nut blank, wherein hardening heat is 1150 DEG C, keeps the temperature 4h, and tempering temperature is 825 DEG C, keeps the temperature 4h；
S7 finishing: semi-finished product nut blank is refined to design technology size, obtains finished product nut；
S8 cleaning: the mode that finished product nut carries out ultrasonic wave added pickling is cleaned；
S9 secondary heat treatment: the high temperature resistance and high strength nut is obtained after Wetted constructures, wherein aging temperature
It is 710 DEG C, keeps the temperature 7h.
Surface layer composite cementation processing in the step S6: using crude product bolt as tantalum plate cathode, pure tantalum plate is as tantalum plate sun
Pole, plasma heating furnace are pumped into the vacuum state of -0.1MPa, start to discharge after being passed through argon gas, and discharge 250min；Tantalum plate power supply is connected,
When being warming up to 820 DEG C, operating air pressure 40Pa is kept, applies voltage 400V and 700V respectively in cathode and anode-side, starts to carry out
Tantalum time 1.5h is seeped in the preparation of crude product bolt surface tantalum alloy layer；After seeping tantalum, crude product bolt is placed in equipped with boriding medium
In boronising kettle, 900 DEG C are warming up to, keeps the temperature 8h, control 7 DEG C/h of cooling velocity allows to cool to room temperature.
Embodiment 4
A kind of high temperature resistance and high strength nut, the chemical component of the nut is by mass percentage are as follows: C:0.07, Si:
0.6, Mn:2.1, P:0.001, S:0.004, Ni:15.0, Cr:15.2, Ti:5.3, Al:0.05, Mo:1.6, Ta:0.03, Nb:
0.05, V:0.10, surplus Fe and inevitable impurity.
Correspondingly, the production method of the high temperature resistance and high strength nut, comprising the following steps:
S1 melting: required raw material is weighed by the mass percent of each chemical component of nut, in Medium frequency induction after high temperature melting
Melting is carried out in furnace；
S2 refining: being added deoxidier and carry out pre-deoxidation, is subsequently sent to refining furnace refining, strengthens deoxidation, then -0.1MPa's
Fruit storage is carried out under vacuum degree, obtains refined molten steel；The deoxidier is made of Mn, Si and Al, and quality percentage contains
The ratio of amount is 15:60:25；
S3 casting: refined molten steel is cast under ultrasonic wave effect, and cast temperature is 1550 DEG C, is obtained after Slow cooling
Casting green body, wherein the frequency of ultrasonic wave is 60KHz；
S4 solid solution: casting green body 1200 DEG C at a temperature of carry out solution treatment, keep the temperature 3h, then air is cooling, obtains
Supersaturated solid solution；
S5 molding: solid solution is subjected to forging operation on forging machine, obtains crude product nut；
S6 is once heat-treated: crude product nut is successively obtained semi-finished product after surface layer composite cementation, quenching and tempering
Nut blank, wherein hardening heat is 1120 DEG C, keeps the temperature 5h, and tempering temperature is 830 DEG C, keeps the temperature 5h；
S7 finishing: semi-finished product nut blank is refined to design technology size, obtains finished product nut；
S8 cleaning: the mode that finished product nut carries out ultrasonic wave added pickling is cleaned；
S9 secondary heat treatment: the high temperature resistance and high strength nut is obtained after Wetted constructures, wherein aging temperature
It is 700 DEG C, keeps the temperature 12h.
Surface layer composite cementation processing in the step S6: using crude product bolt as tantalum plate cathode, pure tantalum plate is as tantalum plate sun
Pole, plasma heating furnace are pumped into the vacuum state of -0.1MPa, start to discharge after being passed through argon gas, and discharge 30min；Tantalum plate power supply is connected, is risen
When temperature is to 800 DEG C, operating air pressure 40Pa is kept, applies voltage 500V and 580V respectively in cathode and anode-side, starts to carry out thick
Tantalum time 1h is seeped in the preparation of product bolt surface tantalum alloy layer；After seeping tantalum, crude product bolt is placed in the boronising equipped with boriding medium
In kettle, 800 DEG C are warming up to, keeps the temperature 6h, control 5 DEG C/h of cooling velocity allows to cool to room temperature.
Embodiment 5
Each chemical component and its content of the present embodiment high temperature resistance and high strength nut are same as Example 1, main difference
Place is the step S3 casting: refined molten steel is cast under ultrasonic wave effect, and cast temperature is 1560 DEG C, slowly cold
But casting green body is obtained afterwards, and wherein the frequency of ultrasonic wave is 50KHz；Step S4 solid solution: casting green body 1220 DEG C at a temperature of
Solution treatment is carried out, 3h is kept the temperature, then air is cooling, obtains degree of supersaturation solid solution.
Embodiment 6
Each chemical component and its content of the present embodiment high temperature resistance and high strength nut are same as Example 2, main difference
Place is that the step S6 is once heat-treated: crude product nut is successively obtained after surface layer composite cementation, quenching and tempering
To semi-finished product nut blank, wherein hardening heat is 1080 DEG C, keeps the temperature 3h, and tempering temperature is 820 DEG C, keeps the temperature 3h；
Surface layer composite cementation processing in the step S6: using crude product bolt as tantalum plate cathode, pure tantalum plate is as tantalum plate sun
Pole, plasma heating furnace are pumped into the vacuum state of -0.1MPa, start to discharge after being passed through argon gas, and discharge 20min；Tantalum plate power supply is connected, is risen
When temperature is to 800 DEG C, operating air pressure 30Pa is kept, applies voltage 300V and 580V respectively in cathode and anode-side, starts to carry out thick
Tantalum time 1h is seeped in the preparation of product bolt surface tantalum alloy layer；After seeping tantalum, crude product bolt is placed in the boronising equipped with boriding medium
In kettle, 800 DEG C are warming up to, keeps the temperature 6h, control 5 DEG C/h of cooling velocity allows to cool to room temperature.
S9 secondary heat treatment: the high temperature resistance and high strength nut is obtained after Wetted constructures, wherein aging temperature
It is 700 DEG C, keeps the temperature 6h.
Comparative example 1
Each chemical component and its content of this comparative example nut are same as Example 1, the main difference of production method it
Be in and cast in the step S3: refined molten steel is cast at 1550 DEG C, and casting green body is obtained after Slow cooling.
Comparative example 2
Each chemical component and its content of this comparative example nut are same as Example 3, the main difference of production method it
Be in and be dissolved in the step S4: casting green body 980 DEG C at a temperature of carry out solution treatment, keep the temperature 2.5h, then air is cold
But, supersaturated solid solution is obtained.
Comparative example 3
Each chemical component and its content of this comparative example nut are same as Example 3, the main difference of production method it
It is in and is once heat-treated in not carrying out the step S6.
Comparative example 4
Each chemical component and its content of this comparative example nut are same as Example 3, the main difference of production method it
It is in not carrying out the step S9 secondary heat treatment.
Examples 1 to 6 and 1~4 experimental condition of comparative example difference are as follows:
The nut of embodiment 1 and embodiment 2 is separately heated to 700 DEG C and 800 DEG C of temperature carry out long-term baked test；
The nut of embodiment 3 and embodiment 4 is separately heated to 750 DEG C and 800 DEG C of temperature, is then cooled to room temperature, again
Repeat-heating is cooling, and cycle-index is respectively 200 times and 300 times；
The nut of embodiment 5 and embodiment 6 is separately heated to 700 DEG C and 750 DEG C of temperature, and applies lotus at this temperature
It carries；
The experimental condition of comparative example 1 is with embodiment 1, and the experimental condition of comparative example 2 and comparative example 3 is respectively the same as 3 He of embodiment
Embodiment 4, the experimental condition of comparative example 4 is the same as embodiment 5.
Examples 1 to 6 and the resulting high temperature resistance and high strength nut of comparative example 1~4 are tested for the property, as a result such as table 1
It is shown:
Table 1
| Tensile strength, MPa | Yield strength, MPa | Nut hardness, HRC | |
| Embodiment 1 | 980 | 880 | 44.2 |
| Embodiment 2 | 960 | 890 | 42.2 |
| Embodiment 3 | 970 | 860 | 41.8 |
| Embodiment 4 | 980 | 840 | 42.6 |
| Embodiment 5 | 970 | 860 | 41.7 |
| Embodiment 6 | 930 | 870 | 42.1 |
| Comparative example 1 | 740 | 670 | 31.2 |
| Comparative example 2 | 760 | 710 | 32.6 |
| Comparative example 3 | 730 | 690 | 34.5 |
| Comparative example 4 | 750 | 700 | 30.1 |
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and what is described in the above embodiment and the description is only the present invention
Principle, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these variation and
Improvement is both fallen in the range of claimed invention.The present invention claims protection scope by appended claims and its
Equivalent defines.
Claims (5)
1. a kind of high temperature resistance and high strength nut, which is characterized in that the chemical component of the nut is by mass percentage are as follows: C:
0.03~0.07, Si:0.3~0.6, Mn:1.8~2.1, P :≤0.003, S :≤0.005, Ni:12.0~15.0, Cr:12.5
~15.2, Ti:4.5~5.3, Al :≤0.05, Mo:1.1~1.6, Ta:0.01~0.03, Nb:0.03~0.05, V:0.02~
0.10, surplus Fe and inevitable impurity, and the content of above-mentioned each chemical component must simultaneously meet following relationship: Mo equivalent >
1.9%, Cr equivalent > 14.1%, Mo equivalent=Mo+ (Cr+Si)/15+0.32V-0.8Al；Cr equivalent=Cr+1.21 (Mo+Si)+
0.66V-0.85Al；Ta+Nb+V≤0.15%；Wherein, the symbol of element indicates mass percentage content of the element in bolt.
2. high temperature resistance and high strength nut as described in claim 1, which is characterized in that the chemical component of the nut presses quality hundred
Ratio is divided to be calculated as: C:0.052, Si:0.5, Mn:1.98, P:0.001, S:0.002, Ni:13.6, Cr:13.5, Ti:4.75, Al:
0.032, Mo:1.35, Ta:0.022, Nb:0.042, V:0.08, surplus Fe and inevitable impurity.
3. high temperature resistance and high strength nut as described in claim 1, which is characterized in that the chemical component of the nut presses quality hundred
Ratio is divided to be calculated as: C:0.042, Si:0.4, Mn:1.82, P:0.002, S:0.004, Ni:14.5, Cr:14.2, Ti:4.91, Al:
0.04, Mo:1.45, Ta:0.016, Nb:0.048, V:0.06, surplus Fe and inevitable impurity.
4. a kind of production method of high temperature resistance and high strength nut as described in claim 1, which is characterized in that including following step
It is rapid:
S1 melting: required raw material is weighed by the mass percent of each chemical component of nut, after high temperature melting in intermediate frequency furnace
Carry out melting；
S2 refining: being added deoxidier and carry out pre-deoxidation, is subsequently sent to refining furnace refining, strengthens deoxidation, then the vacuum in -0.1MPa
Degree is lower to carry out Fruit storage, obtains refined molten steel；
S3 casting: refined molten steel is cast under ultrasonic wave effect, and cast temperature is 1520~1570 DEG C, after Slow cooling
To casting green body, wherein the frequency of ultrasonic wave is 40~60KHz；
S4 solid solution: casting green body 1200 ± 50 DEG C at a temperature of carry out solution treatment, keep the temperature 1.5~3h, then air is cooling,
Obtain supersaturated solid solution；
S5 molding: solid solution is subjected to forging operation on forging machine, obtains crude product nut；
S6 is once heat-treated: crude product nut is successively obtained semi-finished product nut after surface layer composite cementation, quenching and tempering
Blank, wherein hardening heat is 1080~1150 DEG C, keeps the temperature 3~5h, and tempering temperature is 820~830 DEG C, keeps the temperature 3~5h；
S7 finishing: semi-finished product nut blank is refined to design technology size, obtains finished product nut；
S8 cleaning: the mode that finished product nut carries out ultrasonic wave added pickling is cleaned；
S9 secondary heat treatment: obtaining the high temperature resistance and high strength nut after Wetted constructures, and wherein aging temperature is 700
~720 DEG C, keep the temperature 6~12h.
5. the production method of high temperature resistance and high strength nut as claimed in claim 4, which is characterized in that the table in the step S6
Layer composite cementation processing: using crude product bolt as tantalum plate cathode, pure tantalum plate is pumped into -0.1MPa's as tantalum plate anode, plasma heating furnace
Vacuum state starts to discharge after being passed through argon gas, and discharge 20~30min；Tantalum plate power supply is connected, when being warming up to 800~850 DEG C, is protected
30~50Pa of operating air pressure is held, applies voltage 300~500V and 580~800V respectively in cathode and anode-side, starts to carry out thick
1~2h of tantalum time is seeped in the preparation of product bolt surface tantalum alloy layer；After seeping tantalum, crude product bolt is placed in equipped with boriding medium
In boronising kettle, 800~1000 DEG C are warming up to, keeps the temperature 6~12h, control 5~10 DEG C/h of cooling velocity allows to cool to room temperature.
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|---|---|---|---|
| CN201811153294.6A CN109182906A (en) | 2018-09-30 | 2018-09-30 | A kind of high temperature resistance and high strength nut and its production method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111893258A (en) * | 2020-08-10 | 2020-11-06 | 阪上精密五金(太仓)有限公司 | High-strength manufacturing process for nut of screw fastener |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101784687A (en) * | 2007-10-03 | 2010-07-21 | 住友金属工业株式会社 | Austenitic stainless steel |
| CN104818483A (en) * | 2015-04-13 | 2015-08-05 | 南京理工大学 | Medium carbon CrNiMo steel surface chromium-tantalum gradient coating and preparation method thereof |
| CN106086680A (en) * | 2016-08-16 | 2016-11-09 | 宁波瑞国精机工业有限公司 | A kind of high strength nut and processing method thereof |
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2018
- 2018-09-30 CN CN201811153294.6A patent/CN109182906A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101784687A (en) * | 2007-10-03 | 2010-07-21 | 住友金属工业株式会社 | Austenitic stainless steel |
| CN104818483A (en) * | 2015-04-13 | 2015-08-05 | 南京理工大学 | Medium carbon CrNiMo steel surface chromium-tantalum gradient coating and preparation method thereof |
| CN106086680A (en) * | 2016-08-16 | 2016-11-09 | 宁波瑞国精机工业有限公司 | A kind of high strength nut and processing method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111893258A (en) * | 2020-08-10 | 2020-11-06 | 阪上精密五金(太仓)有限公司 | High-strength manufacturing process for nut of screw fastener |
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Application publication date: 20190111 |