CN105154785B - High-strength bolt and its manufacture method - Google Patents
High-strength bolt and its manufacture method Download PDFInfo
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- CN105154785B CN105154785B CN201510418118.0A CN201510418118A CN105154785B CN 105154785 B CN105154785 B CN 105154785B CN 201510418118 A CN201510418118 A CN 201510418118A CN 105154785 B CN105154785 B CN 105154785B
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000000137 annealing Methods 0.000 claims description 60
- 238000011282 treatment Methods 0.000 claims description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 24
- 238000010791 quenching Methods 0.000 claims description 24
- 230000000171 quenching effect Effects 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 23
- 238000002161 passivation Methods 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 230000000415 inactivating effect Effects 0.000 claims description 16
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 16
- 238000005530 etching Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 10
- 239000000470 constituent Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 8
- 235000010344 sodium nitrate Nutrition 0.000 claims description 8
- 239000004317 sodium nitrate Substances 0.000 claims description 8
- 239000004925 Acrylic resin Substances 0.000 claims description 7
- 229920000178 Acrylic resin Polymers 0.000 claims description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 7
- 239000002202 Polyethylene glycol Substances 0.000 claims description 7
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 7
- 229940043237 diethanolamine Drugs 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 239000011733 molybdenum Substances 0.000 claims description 7
- 229920001223 polyethylene glycol Polymers 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 7
- 238000005496 tempering Methods 0.000 claims description 7
- 238000010000 carbonizing Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims 1
- 239000002253 acid Substances 0.000 claims 1
- 150000001336 alkenes Chemical class 0.000 claims 1
- 238000005660 chlorination reaction Methods 0.000 claims 1
- 238000005520 cutting process Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims 1
- 239000011574 phosphorus Substances 0.000 claims 1
- 229910052698 phosphorus Inorganic materials 0.000 claims 1
- 239000011347 resin Substances 0.000 claims 1
- 229920005989 resin Polymers 0.000 claims 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 9
- 238000003672 processing method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention provides a kind of high-strength bolt, it is made up of steel plate, the parts by weight of each chemical composition of steel plate should meet following requirements：C 0.32~0.45,Mn 0.55~0.74,V 0.07~0.12,Si 0.16~0.28,W 0.01~0.04,P≤0.025,S≤0.03,Ni 0.08~0.15,Sn 0.20~0.30,Cu 0.25~0.35,Al 0.12~0.35,B 0.002~0.004,Mo 0.3~0.5,Ti 0.003~0.01,Cr 0.08~0.13,Nb 0.01~0.015,Fe 90~100,Present invention also offers the manufacture method of high-strength bolt,High-strength bolt of the present invention improves bolt bulk strength,Bolt precision is high,Quality is good,Substantially increase its tensile strength,While improving bolt service life,Can also be wear-resistant,Endurance.
Description
Technical field
The present invention relates to the processing method of bolt, especially a kind of high-strength bolt and its manufacture method.
Background technology
Bolt is a kind of very extensive accessory of application, it is all be unable to do without from Aero-Space to daily life, according to intensity
Difference, bolt can be divided into plain bolt and high-strength bolt.Compared with plain bolt, high-strength bolt has many advantages：
The Assembling used time is short, little impact on production, and service life length, suitable member scope is wide, and connection is safe and reliable, has preferable
Manufacturability and economy.Exactly because these advantages of high-strength bolt, industrially developed country occur to high intensity in recent years
Bolting steel and high-strength bolt concentrate the phenomenon of research, and have developed a series of superhigh intensity bolting steels and superhigh intensity spiral shell
Bolt.
Chinese patent application (publication number：CN101890618A) it is related to a kind of processing method of high-strength bolt, this method
Using SCM440 and 42CrMoVNb materials produce, by selection, the gauge or diameter of wire needed for line is taken out in wire rod nodularization, pickling, by
The head dummy and bar portion of bolt on multistation cold forging machine needed for 3~4 extrusion formings, through rolling threading rub required screw thread and
Reach.Thermally treated Q-tempering gets to required hardness and intensity.Although using the processing method can be made intensity and
Hardness reaches 12.9 and 14.9 grade high-strength bolts, but its plasticity and toughness are still unable to reach the requirement of high-strength bolt.
The content of the invention
To solve the above problems, the invention discloses a kind of high-strength bolt and its manufacture method.
In order to reach object above, the present invention provides following technical scheme：
A kind of high-strength bolt, is process by steel plate, under the parts by weight of each chemical composition of the steel plate should meet
State requirement：C 0.32~0.45, Mn 0.55~0.74, V 0.07~0.12, Si 0.16~0.28, W 0.01~0.04, P
≤ 0.025, S≤0.03, Ni 0.08~0.15, Sn 0.20~0.30, Cu 0.25~0.35, Al 0.12~0.35, B
0.002~0.004, Mo 0.3~0.5, Ti 0.003~0.01, Cr 0.08~0.13, Nb 0.01~0.015, Fe 90~
100, the bolt passes through stock-soft annealing-cold-forge forming-screw thread process-heat treatment-Passivation Treatment-phosphorating treatment-nigrescence
Handle to prepare, comprise the following steps that：
（1）Stock：Derusted from the steel plate acid-washing of the composition, and it is appropriately sized according to the specification size interception of bolt
Cylinder blank；
（2）Soft annealing；Soft annealing is divided into twice, is specially：Soft annealing：Blank is carried out in clock hood type furnace
Isothermal soft annealing, softening annealing temperature be 750~800 DEG C, soaking time be 7~8 hours, its hardness control less than
HB120, control 25~30ml/min of methanol flow, 0.2~0.25Nm3/h of gas flow, secondary soft annealing：Annealing temperature is
650~700 DEG C, 5~6h of time, add alcohol 20~25ml/min of flow, 0.2~0.25Nm3/h of gas flow；
（3）Cold-forge forming：Bar material after annealing is cut to length needed for bolt, is put under normal temperature in mold cavity, with
Upset force is allowed to be formed the head and bar portion size needed for bolt；
（4）Screw thread process：At room temperature thread forming is carried out from screw-rolling machine；
（5）Heat treatment：By bolt external screw thread at 550 DEG C, quenched with quenching oil, then the bolt after quenching is existed
It is tempered at 350 DEG C, 70~80 minutes duration, by 650 DEG C of the light bar segment of bolt, is quenched with water-based quenching liquid
Fire, then the bolt after quenching is tempered at 400 DEG C, 60~70 minutes duration, Carburization Treatment is finally carried out, will oozed
Carbon agent is sent into tempering furnace, 90~110min of Carburization Treatment in 1100~1150 DEG C of temperature ranges；
（6）Passivation Treatment, by the bolt after heat treatment immerse temperature be processing 4 in 100~120 DEG C of inactivating treatment liquid~
5min, the inactivating treatment liquid are prepared by the material mixing of following weight proportioning:5~6 parts of water-soluble molybdenum hydrochlorates, 10~
12 parts of diethanol amine, 80~100 parts of alkaline silica sols, 90~100 parts of water soluble acrylic resins, 90~100 parts of water；
（7）Phosphorating treatment, the bolt after Passivation Treatment is put into 3~5min of immersion in 50~60 DEG C of etching solutions, then
Cleaned, air-dried, get product bolt, the parts by weight of wherein each constituent of etching solution are:70~80 parts of poly- second two
Alcohol, 30~35 parts of Mazhev salts, 5~6 parts of sodium nitrate, 2.5~3.5 parts of ferric trichlorides, 100~120 parts of water；
（8）Blackening process, blackening process is carried out to bolt, controls 100~110 DEG C of temperature；25~30 minutes time；Enter again
Row cleaning, air-dry, get product bolt.
Preferably, step（2）The soft annealing is divided into twice, is specially：Soft annealing：By blank in bell jar
Isothermal soft annealing is carried out in stove, softening annealing temperature is 780 DEG C, and soaking time is 7.5 hours, the control of its hardness less than
HB120, methanol flow 30ml/min, gas flow 0.12Nm3/h are controlled, to prevent case-carbonizing；Secondary soft annealing：Annealing
Temperature is 680 DEG C, time 5.5h, adds alcohol flow 23ml/min, gas flow 0.12Nm3/h.
Preferably, step（6）The Passivation Treatment is specially：It is 110 DEG C that bolt after heat treatment is immersed into temperature
5min is handled in inactivating treatment liquid, the inactivating treatment liquid is prepared by the material mixing of following weight proportioning:5 parts water-soluble
Property molybdate, 11 parts of diethanol amine, 90 parts of alkaline silica sols, 95 parts of water soluble acrylic resins, 95 parts of water.
Preferably, step（7）The phosphorating treatment by the bolt after Passivation Treatment specifically, be put into 55 DEG C of phosphorating treatments
4min is soaked in liquid, then is cleaned, air-dried, gets product bolt, the parts by weight of wherein each constituent of etching solution are:
75 parts of polyethylene glycol, 32 parts of Mazhev salts, 6 parts of sodium nitrate, 3 parts of ferric trichlorides, 110 parts of water.
What the present invention obtained has the beneficial effect that：Bolt bulk strength is improved, bolt precision is high, and quality is good, greatly improves
Its tensile strength, while improving bolt service life, additionally it is possible to wear-resistant, endurance, use the connection safety of process
Reliably, it is not easy because contingency occurs for the problems such as fractureing.
Embodiment
With reference to embodiment, the present invention is furture elucidated, it should be understood that following embodiments are only used for
The bright present invention rather than limitation the scope of the present invention.
Table 1：The chemical composition (pressing mass fraction) of steel plate used in high-strength bolt of the present invention
Embodiment 1
Select the steel plate of chemical composition and percent mass proportioning for embodiment 1 in table 1, specific procedure of processing is as follows：
（1）Stock：Derusted from the steel plate acid-washing of the composition, and it is appropriately sized according to the specification size interception of bolt
Cylinder blank；
（2）Soft annealing；Soft annealing is divided into twice, is specially：Soft annealing：Blank is carried out in clock hood type furnace
Isothermal soft annealing, softening annealing temperature are 750 DEG C, and soaking time is 7 hours, and the control of its hardness controls first less than HB120
Alcohol flow 25ml/min, gas flow 0.2Nm3/h, to prevent case-carbonizing；Secondary soft annealing：Annealing temperature is 650 DEG C,
Time 5h, add alcohol flow 20ml/min, gas flow 0.2Nm3/h；
（3）Cold-forge forming：Cylindrical stock after annealing is cut to length needed for bolt, mold cavity is put under normal temperature
It is interior, it is allowed to be formed head and bar portion size needed for bolt with upset force；
（4）Screw thread process：At room temperature thread forming is carried out from screw-rolling machine；
（5）Heat treatment：By bolt external screw thread at 550 DEG C, quenched with quenching oil, then the bolt after quenching is existed
It is tempered, 70 minutes duration, by the light bar segment of bolt at 650 DEG C, is quenched with water-based quenching liquid at 350 DEG C,
The bolt after quenching is tempered at 400 DEG C again, 60 minutes duration, Carburization Treatment is finally carried out, carburizer is sent
Enter in tempering furnace, the Carburization Treatment 90min in 1100 DEG C of temperature ranges；
（6）Passivation Treatment, the bolt after heat treatment is immersed in the inactivating treatment liquid that temperature is 100 DEG C and handles 5min, institute
Stating inactivating treatment liquid is prepared by the material mixing of following weight proportioning:5 parts of water-soluble molybdenum hydrochlorates, 10 parts of diethanol amine,
100 parts of alkaline silica sols, 90 parts of water soluble acrylic resins, 90 parts of water；
（7）Phosphorating treatment, the bolt after Passivation Treatment is put into 50 DEG C of etching solutions and soaks 3min, then carried out clear
Wash, air-dry, get product bolt, the parts by weight of wherein each constituent of etching solution are:700 parts of polyethylene glycol, 30 portions of horses
Day husband's salt, 5 parts of sodium nitrate, 3.5 parts of ferric trichlorides, 100 parts of water；
（8）Blackening process, blackening process is carried out to bolt, controls 100 DEG C of temperature；25 minutes time；Cleaned again, wind
It is dry, get product bolt.
Embodiment 2
Select the steel plate of chemical composition and percent mass proportioning for embodiment 2 in table 1, specific procedure of processing is as follows：
（1）Stock：Derusted from the steel plate acid-washing of the composition, and it is appropriately sized according to the specification size interception of bolt
Cylinder blank；
（2）Soft annealing；Soft annealing is divided into twice, is specially：Soft annealing：Blank is carried out in clock hood type furnace
Isothermal soft annealing, softening annealing temperature are 800 DEG C, and soaking time is 8 hours, and the control of its hardness controls first less than HB120
Alcohol flow 30ml/min, gas flow 0.25Nm3/h, to prevent case-carbonizing；Secondary soft annealing：Annealing temperature is 700 DEG C,
Time 6h, add alcohol flow 25ml/min, gas flow 0.25Nm3/h；
（3）Cold-forge forming：Cylindrical stock after annealing is cut to length needed for bolt, mold cavity is put under normal temperature
It is interior, it is allowed to be formed head and bar portion size needed for bolt with upset force；
（4）Screw thread process：At room temperature thread forming is carried out from screw-rolling machine；
（5）Heat treatment：By bolt external screw thread at 550 DEG C, quenched with quenching oil, then the bolt after quenching is existed
It is tempered at 350 DEG C, 80 minutes duration, by 650 DEG C of the light bar segment of bolt, is quenched with water-based quenching liquid, then
Bolt after quenching is tempered at 400 DEG C, 70 minutes duration, Carburization Treatment is finally carried out, carburizer is sent into
In tempering furnace, the Carburization Treatment 110min in 1150 DEG C of temperature ranges；
（6）Passivation Treatment, the bolt after heat treatment is immersed in the inactivating treatment liquid that temperature is 120 DEG C and handles 5min, institute
Stating inactivating treatment liquid is prepared by the material mixing of following weight proportioning:5~6 parts of water-soluble molybdenum hydrochlorates, 12 parts of diethanols
Amine, 100 parts of alkaline silica sols, 90 parts of water soluble acrylic resins, 100 parts of water；
（7）Phosphorating treatment, the bolt after Passivation Treatment is put into 60 DEG C of etching solutions and soaks 5min, then carried out clear
Wash, air-dry, get product bolt, the parts by weight of wherein each constituent of etching solution are:80 parts of polyethylene glycol, 35 parts of Ma
Husband's salt, 5 parts of sodium nitrate, 3.5 parts of ferric trichlorides, 120 parts of water；
（8）Blackening process, blackening process is carried out to bolt, controls 110 DEG C of temperature；30 minutes time；Cleaned again, wind
It is dry, get product bolt.
Embodiment 3
Select the steel plate of chemical composition and percent mass proportioning for embodiment 3 in table 1, specific procedure of processing is as follows：
（1）Stock：Derusted from the steel plate acid-washing of the composition, and it is appropriately sized according to the specification size interception of bolt
Cylinder blank；
（2）Soft annealing；Soft annealing is divided into twice, is specially：Soft annealing：Blank is carried out in clock hood type furnace
Isothermal soft annealing, softening annealing temperature are 780 DEG C, and soaking time is 7.5 hours, and the control of its hardness is less than HB120, control
Methanol flow 30ml/min, gas flow 0.22Nm3/h, to prevent case-carbonizing；Secondary soft annealing：Annealing temperature is 680
DEG C, time 5.5h, add alcohol flow 23ml/min, gas flow 0.22Nm3/h；
（3）Cold-forge forming：Cylindrical stock after annealing is cut to length needed for bolt, mold cavity is put under normal temperature
It is interior, it is allowed to be formed head and bar portion size needed for bolt with upset force；
（4）Screw thread process：At room temperature thread forming is carried out from screw-rolling machine；
（5）Heat treatment：By bolt external screw thread at 550 DEG C, quenched with quenching oil, then the bolt after quenching is existed
It is tempered at 350 DEG C, 80 minutes duration, by 650 DEG C of the light bar segment of bolt, is quenched with water-based quenching liquid, then
Bolt after quenching is tempered at 400 DEG C, 65 minutes duration, Carburization Treatment is finally carried out, carburizer is sent into
In tempering furnace, the Carburization Treatment 100min in 1130 DEG C of temperature ranges；
（6）Passivation Treatment, the bolt after heat treatment is immersed in the inactivating treatment liquid that temperature is 110 DEG C and handles 5min, institute
Stating inactivating treatment liquid is prepared by the material mixing of following weight proportioning:5 parts of water-soluble molybdenum hydrochlorates, 11 parts of diethanol amine,
90 parts of alkaline silica sols, 95 parts of water soluble acrylic resins, 95 parts of water；
（7）Phosphorating treatment, the bolt after Passivation Treatment is put into 55 DEG C of etching solutions and soaks 4min, then carried out clear
Wash, air-dry, get product bolt, the parts by weight of wherein each constituent of etching solution are:75 parts of polyethylene glycol, 32 parts of Ma
Husband's salt, 6 parts of sodium nitrate, 3 parts of ferric trichlorides, 110 parts of water；
（8）Blackening process, blackening process is carried out to bolt, controls 105 DEG C of temperature；30 minutes time；Cleaned again, wind
It is dry, get product bolt.
Embodiment 4
Select the steel plate of chemical composition and percent mass proportioning for embodiment 4 in table 1, specific procedure of processing is as follows：
（1）Stock：Derusted from the steel plate acid-washing of the composition, and it is appropriately sized according to the specification size interception of bolt
Cylinder blank；
（2）Soft annealing；Soft annealing is divided into twice, is specially：Soft annealing：Blank is carried out in clock hood type furnace
Isothermal soft annealing, softening annealing temperature are 780 DEG C, and soaking time is 7.5 hours, and the control of its hardness is less than HB120, control
Methanol flow 30ml/min, gas flow 0.22Nm3/h, to prevent case-carbonizing；Secondary soft annealing：Annealing temperature is 680
DEG C, time 5.5h, add alcohol flow 23ml/min, gas flow 0.22Nm3/h；
（3）Cold-forge forming：Cylindrical stock after annealing is cut to length needed for bolt, mold cavity is put under normal temperature
It is interior, it is allowed to be formed head and bar portion size needed for bolt with upset force；
（4）Screw thread process：At room temperature thread forming is carried out from screw-rolling machine；
（5）Heat treatment：By bolt external screw thread at 550 DEG C, quenched with quenching oil, then the bolt after quenching is existed
It is tempered at 350 DEG C, 80 minutes duration, by 650 DEG C of the light bar segment of bolt, is quenched with water-based quenching liquid, then
Bolt after quenching is tempered at 400 DEG C, 65 minutes duration, Carburization Treatment is finally carried out, carburizer is sent into
In tempering furnace, the Carburization Treatment 100min in 1130 DEG C of temperature ranges；
（6）Passivation Treatment, the bolt after heat treatment is immersed in the inactivating treatment liquid that temperature is 110 DEG C and handles 5min, institute
Stating inactivating treatment liquid is prepared by the material mixing of following weight proportioning:5 parts of water-soluble molybdenum hydrochlorates, 11 parts of diethanol amine,
90 parts of alkaline silica sols, 95 parts of water soluble acrylic resins, 95 parts of water；
（7）Phosphorating treatment, the bolt after Passivation Treatment is put into 55 DEG C of etching solutions and soaks 4min, then carried out clear
Wash, air-dry, get product bolt, the parts by weight of wherein each constituent of etching solution are:75 parts of polyethylene glycol, 32 parts of Ma
Husband's salt, 6 parts of sodium nitrate, 3 parts of ferric trichlorides, 110 parts of water；
（8）Blackening process, blackening process is carried out to bolt, controls 105 DEG C of temperature；30 minutes time；Cleaned again, wind
It is dry, get product bolt.
Embodiment 5
The high-strength bolt obtained according to the preparation method of embodiment 1~4, after testing its mechanical performance such as institute of table 2
Show：
Table 2：The mechanical performance of high-strength bolt of the present invention
| Tensile strength Mpa | Yield strength Mpa | Vickers intensity（HV） | Rockwell intensity (HR) | Elongation after fracture | Have no progeny expansion and contraction | |
| Embodiment 1 | ≥1568 | ≥1367 | 459~472 | 42~44 | ≥11 | ≥53 |
| Embodiment 2 | ≥1576 | ≥1358 | 462~481 | 41~44 | ≥10 | ≥53 |
| Embodiment 3 | ≥1582 | ≥1374 | 464~483 | 43~45 | ≥12 | ≥54 |
| Embodiment 4 | ≥1563 | ≥1355 | 457~469 | 42~45 | ≥11 | ≥52 |
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned embodiment, in addition to
Formed technical scheme is combined by above technical characteristic.It should be pointed out that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (4)
- A kind of 1. high-strength bolt, it is characterised in that：It is process by steel plate, the parts by weight of each chemical composition of the steel plate Following requirements should be met：C 0.32~0.45, Mn 0.55~0.74, V 0.07~0.12, Si 0.16~0.28, W 0.01~ 0.04th, P≤0.025, S≤0.03, Ni 0.08~0.15, Sn 0.20~0.30, Cu 0.25~0.35, Al 0.12~ 0.35th, B 0.002~0.004, Mo 0.3~0.5, Ti 0.003~0.01, Cr 0.08~0.13, Nb 0.01~0.015, Fe 90~100, the bolt by stock-soft annealing-cold-forge forming-screw thread process-heat treatment-Passivation Treatment-phosphatization at Prepared by reason-blackening process, comprise the following steps that：（1）Stock：Derusted from the steel plate acid-washing of the composition, and appropriately sized cylinder is intercepted according to the specification size of bolt Shape blank；（2）Soft annealing；Soft annealing is divided into twice, is specially：Soft annealing：Blank is subjected to isothermal in clock hood type furnace Soft annealing, softening annealing temperature are 750~800 DEG C, and soaking time is 7~8 hours, and the control of its hardness is less than HB120, control 25~30ml/min of methanol flow processed, 0.2~0.25Nm of gas flow3/ h, secondary soft annealing：Annealing temperature is 650~700 DEG C, 5~6h of time, 20~25ml/min of methanol flow, 0.2~0.25Nm of gas flow3/h；（3）Cold-forge forming：It is put into mold cavity, length needed for the cutting ingot to bolt after annealing with upsetting under normal temperature Power is allowed to be formed the head and bar portion size needed for bolt；（4）Screw thread process：At room temperature thread forming is carried out from screw-rolling machine；（5）Heat treatment：By bolt external screw thread at 550 DEG C, quenched with quenching oil, then by the bolt after quenching at 350 DEG C Under be tempered, 70~80 minutes duration, by the light bar segment of bolt at 650 DEG C, quenched with water-based quenching liquid, then Bolt after quenching is tempered at 400 DEG C, 60~70 minutes duration, Carburization Treatment is finally carried out, by carburizer It is sent into tempering furnace, 90~110min of Carburization Treatment in 1100~1150 DEG C of temperature ranges；（6）Passivation Treatment, by the bolt after heat treatment immerse temperature be processing 4 in 100~120 DEG C of inactivating treatment liquid~ 5min, the inactivating treatment liquid are prepared by the material mixing of following weight proportioning:5~6 parts of water-soluble molybdenum hydrochlorates, 10~ 12 parts of diethanol amine, 80~100 parts of alkaline silica sols, 90~100 parts of water soluble acrylic resins, 90~100 parts of water；（7）Phosphorating treatment, the bolt after Passivation Treatment is put into 3~5min of immersion in 50~60 DEG C of etching solutions, then carried out Cleaning, air-dry, get product bolt, the parts by weight of wherein each constituent of etching solution are:70~80 parts of polyethylene glycol, 30 ~35 parts of Mazhev salts, 5~6 parts of sodium nitrate, 2.5~3.5 parts of ferric trichlorides, 100~120 parts of water；（8）Blackening process, blackening process is carried out to bolt, controls 100~110 DEG C of temperature；25~30 minutes time；Carry out again clear Wash, air-dry, get product bolt.
- 2. high-strength bolt as claimed in claim 1, it is characterised in that：Step（2）The soft annealing is divided into twice, specifically For：Soft annealing：Blank is subjected to isothermal soft annealing in clock hood type furnace, softening annealing temperature is 780 DEG C, soaking time For 7.5 hours, the control of its hardness controlled methanol flow 30ml/min, gas flow 0.12Nm less than HB1203/ h, to prevent Case-carbonizing；Secondary soft annealing：Annealing temperature is 680 DEG C, time 5.5h, methanol flow 23ml/min, gas flow 0.12Nm3/h。
- 3. high-strength bolt as claimed in claim 1, it is characterised in that：Step（6）The Passivation Treatment is specially：At heat Bolt after reason, which is immersed in the inactivating treatment liquid that temperature is 110 DEG C, handles 5min, and the inactivating treatment liquid is matched somebody with somebody by following weight The material mixing of ratio is prepared:5 parts of water-soluble molybdenum hydrochlorates, 11 parts of diethanol amine, 90 parts of alkaline silica sols, 95 parts of water solubilitys third Olefin(e) acid resin, 95 parts of water.
- 4. high-strength bolt as claimed in claim 1, it is characterised in that：Step（7）The phosphorating treatment is specifically, will passivation Bolt after processing, which is put into 55 DEG C of etching solutions, soaks 4min, then is cleaned, air-dried, and gets product bolt, wherein phosphorus Change each constituent for the treatment of fluid parts by weight be:75 parts of polyethylene glycol, 32 parts of Mazhev salts, 6 parts of sodium nitrate, 3 parts of tri-chlorinations Iron, 110 parts of water.
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| CN107513664A (en) * | 2017-07-10 | 2017-12-26 | 安徽长江紧固件有限责任公司 | A kind of torsion shear type high tensile bolt and its processing technology |
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| CN108103297B (en) * | 2018-02-09 | 2019-06-21 | 艾普零件制造（苏州）股份有限公司 | A kind of heat treatment method of electric tool high-strength bolt |
| CN109317926A (en) * | 2018-09-29 | 2019-02-12 | 江苏永昊高强度螺栓有限公司 | A kind of processing technology of corrosion-resistant bolt |
| CN109372869B (en) * | 2018-09-30 | 2020-10-02 | 江苏永昊高强度螺栓有限公司 | High-strength bolt and manufacturing method thereof |
| CN109531063A (en) * | 2018-11-27 | 2019-03-29 | 重庆旺达汽车零部件有限公司 | A kind of processing method of high-strength bolts |
| CN109531064A (en) * | 2018-11-27 | 2019-03-29 | 重庆旺达汽车零部件有限公司 | A kind of bolt processing method |
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| CN112111697A (en) * | 2020-08-19 | 2020-12-22 | 张清苗 | Preparation method of heavy anti-corrosion alloy connecting bolt |
| CN113500356A (en) * | 2021-07-13 | 2021-10-15 | 安徽长江紧固件有限责任公司 | Pretreatment process of acid-free high-strength anti-delayed fracture weather-resistant fastener |
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| KR101580749B1 (en) * | 2011-07-27 | 2015-12-28 | 신닛테츠스미킨 카부시키카이샤 | High-strength cold-rolled steel sheet with excellent stretch flangeability and precision punchability, and process for producing same |
| CN103205641A (en) * | 2013-02-04 | 2013-07-17 | 繁昌县琪鑫铸造有限公司 | Preparation method for high-strength foundation bolt |
| CN103131948A (en) * | 2013-02-04 | 2013-06-05 | 繁昌县琪鑫铸造有限公司 | Preparation method of high-strength T-shaped bolt |
| CN103128505B (en) * | 2013-02-04 | 2016-01-20 | 繁昌县琪鑫铸造有限公司 | The preparation method of high-strength steel cable bolt |
| CN103205642A (en) * | 2013-02-04 | 2013-07-17 | 繁昌县琪鑫铸造有限公司 | Preparation method for wear-resistant check bolt |
| CN103216509B (en) * | 2013-05-10 | 2015-05-20 | 江苏永昊高强度螺栓有限公司 | High-strength bolt and processing method thereof |
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Denomination of invention: High strength bolt excellent in delayed fracture resistance and method of production of same Effective date of registration: 20191226 Granted publication date: 20171222 Pledgee: Bank of Jiangsu Co., Ltd. Jingjiang sub branch Pledgor: Jiangsu Yonghao High Strength Bolt Co., Ltd. Registration number: Y2019320000402 |
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Date of cancellation: 20210723 Granted publication date: 20171222 Pledgee: Bank of Jiangsu Co.,Ltd. Jingjiang sub branch Pledgor: JIANGSU YONGHAO HIGH-STRENGTH BOLT Co.,Ltd. Registration number: Y2019320000402 |
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