CN105177463B - Delayed-fracture-resistant high-strength bolt alloy material and manufacturing method of bolts - Google Patents
Delayed-fracture-resistant high-strength bolt alloy material and manufacturing method of bolts Download PDFInfo
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- CN105177463B CN105177463B CN201510461011.4A CN201510461011A CN105177463B CN 105177463 B CN105177463 B CN 105177463B CN 201510461011 A CN201510461011 A CN 201510461011A CN 105177463 B CN105177463 B CN 105177463B
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Abstract
The invention relates to a delayed-fracture-resistant high-strength bolt alloy material and a manufacturing method of bolts. The bolt alloy material comprises, by weight, 0.2%-0.5% of C, 0.05%-0.5% of Si, 0.03%-0.08% of Mn, 0.01%-0.02% of P, 0.02%-0.04% of S, 0.1%-0.16% of Cu, 0.24%-0.32% of Co, 0.22%-0.28% of Ni, 0.08%-0.24% of Al, 0.12%-0.26% of Ti, 0.14%-0.29% of Mo, 0.1%-0.15% of V, 0.08%-0.14% of Sm, 0.04%-0.06% of Te, 0.08%-0.14% of neodymium iron boron and the balance Fe and impurity elements. The bolt alloy material is high in strength and good in delayed fracture resistance.
Description
Technical field
A kind of a kind of the present invention relates to bolt alloy material, more particularly to the high-strength bolt alloy material of anti-delayed fracture
Material；The invention further relates to a kind of manufacture method of bolt.
Background technology
Securing member plays the effects such as connection, positioning and sealing in mechanical component, and wherein bolt consumption is maximum.With all kinds of
Machinery, equipment, the continuous maximization of architectural engineering, and the continuous improvement of power, rotating speed, the working condition of bolt class part is more
Plus it is severe, working stress is significantly improved.It is therefore desirable to bolt steel have higher intensity, for example in engineering, aircraft, electric car,
Automobile, bridge can all use the bolt of high intensity；And for example not only span is big for heavy construction grid structure, and is public building mostly
Build, and high-strength bolt is that, for the strength member on spatial truss bolted spherical node, it directly transmits alternate load and causes
Alternation internal force, the quality of its quality is directly related to people life property safety.As connection, secure component, bolt it is high-strength
Degreeization also helps the miniaturization and densification of automobile other structures, therefore, high-strength bolt has broad application prospects.
According to the service condition of high-strength bolt, typically there is requirement to its mechanical property：1st, high-tensile and
High-yield-ratio；2nd, sufficiently high plasticity；3rd, can be tightened repeatedly, the big stress amplitude loading of enough times can be born, with compared with
Low low cycle fatigue property；4th, good resistance to low temperature etc..And with the raising of bolt strength, particularly work as tensile strength
During more than 1200MPa, delayed fracture just becomes extremely to project, this main problem run into when being bolt high intensity.
High-strength bolt belongs to breach part, with good notch sensitivity, easily produces delay at the position of notch stress-concentration
Fracture, thus its use range is restricted.
For improving the intensity of bolt, the Chinese patent application of Application No. CN201110049698.2《A kind of high intensity is high
Toughness alloy steel for bolts and preparation method thereof》(application publication number is CN102094153A) discloses a kind of alloy of bolt
Steel, the steel alloy include following alloying element according to percentage by weight：0.15～0.23C；0.10～0.35Si；0.20～
0.45Mn；P≤0.03；S≤0.025；1.10～1.45Cr；3.30～3.90Ni；0.20～0.45Mo；Cu≤0.05；Al≤
0.03, remaining is Fe and impurity element.Steel alloy disclosed in this application can to a certain degree improve bolt intensity, but not
The delayed fracture of bolt can be improved.
The content of the invention
First technical problem to be solved by this invention is provided one kind and is resistant to postpone for the above-mentioned state of the art
The high-strength bolt alloy material of fracture.
Second technical problem to be solved by this invention is provided one kind and is prolonged using anti-for the above-mentioned state of the art
The high-strength bolt alloy material of fracture manufactures the manufacture method of bolt late, and the bolt prepared by the manufacture method has high-strength
Degree, and can anti-delayed fracture.
The present invention solve technical scheme that above-mentioned first technical problem adopted for：A kind of high intensity of anti-delayed fracture
Bolt alloy material, includes following chemical composition according to percentage by weight：C 0.2%～0.5%；Si 0.05%～0.5%；
Mn 0.03%～0.08%；P 0.01%～0.02%；S 0.02%～0.04%；Cu 0.1%～0.16%；Co
0.24%～0.32%；Ni 0.22%～0.28%；Al 0.08%～0.24%；Ti 0.12%～0.26%；Mo
0.14%～0.29%；V0.1%～0.15%；Sm 0.08%～0.14%；Te 0.04%～0.06%；Neodymium iron boron
0.08%～0.14%；Balance of Fe and impurity element.
In above-mentioned technical proposal, increase the content of Mo, add trace alloying element V, Co, Te, reduce Mn and impurity
Element P, S content, the high strength bolting steel of exploitation have good delayed fracture resistance under 1300MPa level intensity level, enter
One step is thought, due to the post-curing effect of Mo, V system carbide, makes the crystallite dimension of steel refine to 4 μm from about 12 μm
Mesh notch tensile limit stress is significantly improved.
Titanium elements have the function of Metamorphism treatment in the alloy, and in the alloy, the compound that Ti and Cu is formed mainly has
Ti2Cu3, TiCu and Ti2Cu, above-claimed cpd are respectively provided with higher crystalline temperature, can crystallize at 990 DEG C or so, can as it is non-from
Forming core is sent out, so as to thinning microstructure and crystal grain.
After adding titanium and aluminum, organize from the duration lath dendroid that do not go bad and be changed into short-movie shape, and with the tendency of equiax crystal,
The effect of structure refinement is best, mechanical property highest, and the index of intensity and plasticity has significant increase.The main and above-mentioned titanium of aluminum
Interact together, if individually aluminum improves can hardness and reduce plasticity, the interaction with titanium collocation can improve its modeling
Property and hardness will not be reduced.In addition aluminum can form Al on the surface of alloy2O3Film, carries heavy alloyed decay resistance and surface
Fineness.
Rare earth samarium (Sm) and neodymium iron boron are rare earth material, and cobalt can work with samarium one, add rare earth element in the alloy
Can crystal grain thinning, the effect of inhibiting grain growth, purify alloy crystal boundary structure, make rare-earth enrichment in crystal boundary, alloy is with branch
Shape mode grows, and produces more nucleus of crystal.
Preferably, in the high-strength bolt alloy material, Al accounts for 0.12～0.18%.
Preferably, in the high-strength bolt alloy material, Ti accounts for 0.14～0.2%.
Preferably, in the high-strength bolt alloy material, Si accounts for 0.2～0.4%.
Silicon (Si) element is the good deoxidizer of material, adds the solid solution intensity that Si can improve bolting steel in bolting steel,
Be conducive to increasing the temper resistance of material.The plasticity of material can be reduced if the content of silicon is higher than 0.4%, and content is less than
0.2% effect that can reduce its deoxidizer and solution strengthening.
Cu can improve intensity and toughness, particularly atmospheric corrosion performance, have the disadvantage easily to produce hot-short, institute in hot-working
To add Cu and Ti prevent hot-short phenomenon at the same time in alloy, because the compound of Cu and Ti is being tied in heat treatment process
Crystalline substance, can be as non-spontaneous forming core, so as to thinning microstructure and crystal grain.
The present invention solve technical scheme that above-mentioned second technical problem adopted for：It is a kind of to use above-mentioned high-strength bolt
The manufacture method of the bolt of alloy material, comprises the steps：
(1) bar material is cast, by with chemical composition dispensing is compared, bar material blank, the bar material blank moulding by casting, system is obtained
Obtain bar material；
(2) pickling being carried out to the bar material and alkali cleaning being processed, the first bolt with external screw thread and light bar segment is obtained；
(3) hot intensive treatment is carried out to first bolt, the second bolt is obtained；
(4) heat treatment is carried out to second bolt, the 3rd bolt is obtained；
(5) Ageing Treatment is carried out to the 3rd bolt, the 4th bolt is obtained；
(6) process is passivated to the 4th bolt, the 5th bolt is obtained；
(7) Bononizing pretreatment is carried out to the 5th bolt, the 6th bolt is obtained；
(8) bonderizing, finished product bolt are carried out to the 6th bolt.
Preferably, the operating process of step (3) is：First bolt is carried out successively first stage heat treatment, second
Phase heat treatment and phase III heat treatment, are obtained the second bolt；The treatment temperature of the first stage heat treatment be 580～
610 DEG C, process time is 1～2h；The treatment temperature of the second stage heat treatment be 610～630 DEG C, process time be 2～
3h；The treatment temperature of the phase III heat treatment is 630～650 DEG C, and process time is 2～3h.
Preferably, in step (6), the inactivating treatment liquid that the 4th bolt is carried out needed for the Passivation Treatment is included as
The component of lower parts by weight：
Preferably, in step (8), include following weight to the etching solution that the 6th bolt is carried out needed for bonderizing
The component of amount number：
Preferably, the operating process of step (4) is：Second bolt is carried out at external screw thread heat treatment and light bar segment heat
Reason, is obtained the 3rd bolt；
The operating process of the external screw thread heat treatment is：The external screw thread of second bolt is placed at 790～810 DEG C and is added
4～5h of heat；1000～1120 DEG C are warming up to, 10～20min is incubated；Quenching, by quenching after the second bolt be tempered at 650 DEG C
Process 50min；The second bolt after by temper is placed in 280～300 DEG C of solvent naphtha with oily slow cooling；
The operating process of the light bar segment heat treatment is：The light bar segment of second bolt is placed at 790～810 DEG C
Row quenching；Again by quenching after the second bolt at 600～620 DEG C 50～70min of temper；After by temper second
Bolt is placed in 60～90min of Carburization Treatment at 1100～1120 DEG C, and the 3rd bolt is obtained.
The temperature of the heat treatment of above-mentioned steps (4) is higher, can improve intensity and the resistance for delayed fracture of bolt.
Preferably, also include step (9), mechanical enhancer and surface treatment after step (8), the 6th bolt is put
20～40min is heated at 300～350 DEG C, is cooled to 20～25 DEG C；Shot Blasting is carried out to the surface of the 6th bolt；
The 6th bolt after by Shot Blasting is placed in 25～30min of blackening process at 100～110 DEG C；Cleaning, dry, finished product spiral shell
Bolt；
Preferably, in step (1), the process conditions of the moulding by casting are：Slab temperature is down to into 280～320 DEG C, is entered
Go the temperature control stage at least one times, be cooled to room temperature, bar material is obtained；The concrete operations in the temperature control stage every time are, with 25 DEG C/h
Speed be heated to 600～700 DEG C, be incubated 1～2h, then be cooled to 250～300 DEG C with the speed of 30 DEG C/h；
Preferably, in step (5), the treatment temperature of the Ageing Treatment is 150～180 DEG C, and process time is 2～3h；
Preferably, in step (6), the 4th bolt is immersed 5～8min in 100～120 DEG C of inactivating treatment liquid, system
Obtain the 5th bolt；
Preferably, the operating process of step (7) is：70～90 parts of borax anhydrouss are put in process container, 650 are heated to
～720 DEG C, 10～15 parts of SiC powder are subsequently adding, are stirred to borax anhydrouss and is completely melt, be warming up to 780～825 DEG C；Add 8
～12 parts of sodium carbonate, are warming up to 900～920 DEG C while stirring；5th bolt is inserted in above-mentioned process container to be carried out
Bononizing pretreatment, the temperature of Bononizing pretreatment is 850～865 DEG C, and the Bononizing pretreatment time is 2～4h, is cooled to room temperature；Clean, be dried,
The 6th bolt is obtained；
Preferably, the operating process of step (8) is：By the 6th bolt with 12% sodium bicarbonate at 50～60 DEG C
4～6min of washing；Wash the 6th bolt；6th bolt is placed in 100～110 DEG C of etching solution and soaks 5
～8min, cleaning, dry, finished product bolt.
Compared with prior art, it is an advantage of the current invention that：This bolt alloy material optimizes chemical composition, concrete to add
Trace alloying element V, Co, Te, and reduce the content of Mn and impurity element P, S so that based on this chemical composition proportioning
Bolt steel alloy has good delayed fracture resistance under 1300MPa level intensity level；In addition, this bolt alloy material is added
Titanium and aluminum, enhance mechanical property, intensity and the plasticity of bolt steel alloy, and can improve the decay resistance of bolt steel alloy
And surface smoothness.
In a word, by composition and its proportioning of optimization chemical composition, the intensity of this bolt alloy material is enhanced, and
With good delayed fracture resistance.
Specific embodiment
With reference to embodiments the present invention is described in further detail.
Embodiment 1
The bolt alloy material of the present embodiment includes the chemical composition of following percentage by weight：C 0.4%, Si 0.2%,
Mn 0.05%, P 0.01%, S 0.02%, Cu 0.1%, Co 0.25%, Ni 0.24%, Al 0.24%, Ti 0.18%,
Mo 0.18%, V 0.1%, Sm 0.08%, Te 0.04%, neodymium iron boron 0.08%, balance of ferrum and inevitable impurity unit
Element.
Using the manufacture method of the bolt of the bolt alloy material of the present embodiment, including following 9 procedure of processings：
(1) cast bar material；According to the chemical composition of said ratio control-rod material, bar material blank is made, bar material blank is poured
Injection forming, wherein, the slab temperature of moulding by casting is down to 300 DEG C, then is heated to 600 DEG C with 25 DEG C/h of heating rate, protects
Temperature 2 hours, is cooled to 300 DEG C with 30 DEG C/h of rate of temperature fall, so far completes a temperature control stage, repeat above-mentioned
The temperature control stage twice, is cooled to room temperature, and bar material is obtained.
(2) pickling is done to the bar material after casting and alkali cleaning is processed；Require according to the line footpath of bolt, bar material is entered
Row takes out line, so that bar material is retracted to the line footpath needed for screw rod.The bar material shunk after line footpath is cut to into the length needed for bolt,
The bar material after cut-out is put under room temperature and is coated with the mold cavity of plant ash, bar material is formed needed for bolt with upset force
Head and bar portion size；Bar material is pushed finally by the two panels dental lamina of reciprocating tooth roller, by reciprocal action by screw thread
Type is made in rolling, forms the external screw thread of bolt, and the first bolt is obtained.
(3) hot intensive treatment；First the first bolt is placed at 590 DEG C carries out first stage heat treatment 2 hours；Exist again
Second stage heat treatment is carried out at 630 DEG C 2～3 hours；Phase III carries out phase III heat treatment 3 hours at 650 DEG C, system
Obtain the second bolt.
(4) heat treatment；External screw thread heat treatment and light bar segment heat treatment are carried out successively to the second bolt, the 3rd bolt is obtained；
Wherein, the process of external screw thread heat treatment is：The external screw thread of the second bolt is heated 5 hours at 790～810 DEG C,
1120 DEG C are warming up in 20 minutes again, are kept for 20 minutes heat time heating times；Quenched with quenching oil, then by quenching after second
Bolt is tempered at 650 DEG C, 50 minutes persistent period；Take out the second bolt again from tempering furnace and be put into 300 DEG C 200
With oily slow cooling in number solvent naphtha.
The process of light bar segment heat treatment is：By the light bar segment in the middle part of the second bolt at 790～810 DEG C, quenched with aqueouss
Liquid is quenched, then by quenching after the second bolt be tempered at 620 DEG C, 60 minutes persistent period, finally carry out carburizing
Process, carburizer is sent in tempering furnace, Carburization Treatment 70min in 1100 DEG C of temperature ranges is obtained the 3rd bolt.
(5) Ageing Treatment；The 3rd bolt after by heat treatment is heated to 160 DEG C in being put into aging oven, and insulation 3 is little
When, then take out and naturally cool to room temperature, the 4th bolt is obtained.
(6) Passivation Treatment；4th bolt is immersed in the inactivating treatment liquid that temperature is 100～120 DEG C and processes 6min, be obtained
5th bolt；Inactivating treatment liquid is prepared from by the material mixing of following portions by weight：6 parts of water-soluble molybdenum hydrochlorates, 12 part two
Ethanolamine, 70 parts of silicate, 90 parts of water soluble acrylic resins, 100 parts of water.
(7) Bononizing pretreatment；Count by weight：First 80 parts of borax anhydrouss are put in process container, 680 are heated to
DEG C, it is subsequently adding 12 parts of SiC powder and is stirred, treat that borax anhydrouss are completely melt, be warming up to 800 DEG C, adds 10 parts of sodium carbonate,
Reinforcement is stirred to bath temperature and reaches 920 DEG C, and the 5th bolt is placed into boronising in borax bath, and 860 DEG C of bath temperature holding is permanent
Temperature, 4 hours time, naturally cools to room temperature, then carries out cleaning, air-dries, and the 6th bolt is obtained.
(8) bonderizing；The sodium bicarbonate that the 6th bolt mass fraction is 12% is washed into 5 points at 60 DEG C first
Clock, is then washed with cold water, is soaked 6 minutes followed by being used in 100 DEG C of etching solution, then is carried out washing, air-dries.
Above-mentioned etching solution is formed by the component proportion of following parts by weight：12 parts of potassium dihydrogen phosphates, 16 parts of carbon
Sour hydrogen sodium, 6 parts of Polyethylene Glycol, 10 parts of zinc nitrates, 150 parts of deionized waters.
(9) mechanical enhancer and surface treatment；The 6th bolt after first to bonderizing carries out heating and degreases, heating temperature
Spend for 340 DEG C, temperature retention time is 30min, naturally cools to room temperature；Secondly the 6th bolt Jing shot-blasting machines are carried out at the ball blast on surface
Reason, Jing hot water cleaning after having processed；Last workpiece makes fast oxidative of bolt surface with air deflagrate carrying out gas
Black process, controls 110 DEG C of temperature, 30 minutes time；Carry out again cleaning, air-dry, get product bolt.
Embodiment 2
The bolt alloy material of the present embodiment includes the chemical composition of following percentage by weight：C 0.45%, Si
0.15%, Mn 0.05%, P 0.015%, S 0.03%, Cu 0.13%, Co 0.27%, Ni 0.25, Al 0.21%, Ti
0.2%, Mo 0.22%, V 0.14%, Sm 0.09%, Te 0.05%, neodymium iron boron 0.12%, balance of ferrum and inevitable
Impurity element.
Using the manufacture method of the bolt of the bolt alloy material of the present embodiment, including following 9 procedure of processings：
(1) cast bar material；According to the chemical composition of said ratio control-rod material, bar material blank is made, bar material blank is poured
Injection forming, wherein, the slab temperature of moulding by casting is down to 300 DEG C, then is heated to 700 DEG C with 25 DEG C/h of heating rate, protects
Temperature 1.5 hours, is cooled to 300 DEG C with 30 DEG C/h of rate of temperature fall, so far completes a temperature control stage, repeat above-mentioned
The temperature control stage twice, be cooled to room temperature, bar material be obtained.
(2) the bar material after casting does pickling and alkali cleaning is processed；Require according to the line footpath of bolt, bar material is carried out
Line is taken out, so that the bar material is retracted to the line footpath needed for screw rod.The bar material shunk after line footpath is cut to into the length needed for bolt,
At normal temperatures the bar material after cut-out is put into and is coated with the mold cavity of plant ash, bar material is formed needed for bolt with upset force
Head and bar portion size；Bar material is pushed finally by the two panels dental lamina of reciprocating tooth roller, by reciprocal action by spiral shell
Stricture of vagina rolles over type of making, and forms the external screw thread of bolt, and the first bolt is obtained.
(3) hot intensive treatment；First the first bolt is placed at 580 DEG C carries out first stage heat treatment 1.5 hours；Exist again
Second stage heat treatment is carried out at 610 DEG C 2 hours；Phase III carries out phase III heat treatment 2.5 hours at 630 DEG C, system
Obtain the second bolt.
(4) heat treatment；External screw thread heat treatment and light bar segment heat treatment are carried out successively to the second bolt, the 3rd bolt is obtained；
Wherein, the process of external screw thread heat treatment is：Screw thread is rolled over the outer spiral shell of the second bolt of type of making by reciprocal action
Stricture of vagina is heated 4 hours at 790～810 DEG C, then is warming up to 1100 DEG C in 25 minutes, is kept for 15 minutes heat time heating times, with quenching
Oil is quenched, then by quenching after the second bolt be tempered at 650 DEG C, 50 minutes persistent period, then from tempering furnace
Taking-up is put in 290 DEG C of No. 200 solvent naphthas with oily slow cooling.
The process of light bar segment heat treatment is：By the light bar segment in the middle part of the second bolt at 790～810 DEG C, quenched with aqueouss
Liquid is quenched, then the bolt after quenching is tempered at 620 DEG C, 60 minutes persistent period, finally carries out Carburization Treatment,
Carburizer is sent in tempering furnace, Carburization Treatment 80min in 1110 DEG C of temperature ranges is obtained the 3rd bolt.
(5) Ageing Treatment；The 3rd bolt after by heat treatment is heated to 170 DEG C in being put into aging oven, and insulation 2 is little
When, then take out and naturally cool to room temperature, the 4th bolt is obtained.
(6) Passivation Treatment；4th bolt is immersed in the inactivating treatment liquid that temperature is 110 DEG C and processes 5min, be obtained the 5th
Bolt；Inactivating treatment liquid is prepared from by the material mixing of following weight proportioning：4 parts of water-soluble molybdenum hydrochlorates, 8 parts of diethanols
Amine, 70 parts of silicate, 100 parts of water soluble acrylic resins, 100 parts of water.
(7) Bononizing pretreatment；By weight：First 70 parts of borax anhydrouss are put in process container, 660 DEG C are heated to,
It is subsequently adding 15 parts of SiC powder to be stirred, treats that borax anhydrouss are completely melt, be warming up to 800 DEG C, add 8 parts of sodium carbonate, strengthens
It is stirred to bath temperature and reaches 900 DEG C, the 5th bolt is placed into into boronising in borax bath, bath temperature keeps 860 DEG C of constant temperature, when
Between 4 hours, naturally cool to room temperature, then carry out cleaning, air-dry, be obtained the 6th bolt.
(8) bonderizing；The sodium bicarbonate that the 6th bolt mass fraction is 12% is washed into 4 points at 55 DEG C first
Clock, is then washed with cold water, is soaked 8 minutes followed by 105 DEG C of etching solution, then is carried out washing, air-dries.
Above-mentioned etching solution is formed by the component proportion of following parts by weight：10 parts of potassium dihydrogen phosphates, 12 parts of carbon
Sour hydrogen sodium, 4 parts of Polyethylene Glycol, 14 parts of zinc nitrates, 150 parts of deionized waters.
(9) mechanical enhancer and surface treatment；The 6th bolt after first to bonderizing carries out heating and degreases, heating temperature
Spend for 340 DEG C, temperature retention time is 30min, naturally cools to room temperature；Secondly the 6th bolt Jing shot-blasting machines are carried out at the ball blast on surface
Reason, Jing hot water cleaning after having processed；Last 6th bolt makes bolt surface Quick Oxidation carrying out gas and air deflagrate
Blackening process, control 110 DEG C of temperature, 25 minutes time；Carry out again cleaning, air-dry, get product bolt.
Embodiment 3
The bolt alloy material of the present embodiment includes the chemical composition of following percentage by weight：C 0.35%, Si
0.12%, Mn 0.05%, P 0.02%, S 0.04%, Cu 0.3%, Co 0.30%, Ni 0.25, Al 0.1%, Ti
0.18%, Mo 0.22%, V 0.12%, Sm 0.11%, Te 0.05%, neodymium iron boron 0.13%, balance of ferrum and inevitable
Impurity element.
Using the manufacture method of the bolt of the bolt alloy material of the present embodiment, including following 9 procedure of processings：
(1) cast bar material；According to the chemical composition of said ratio control-rod material, bar material blank is made, bar material blank is poured
Injection forming, wherein, the slab temperature of moulding by casting is down to 300 DEG C, then is heated to 680 DEG C with 25 DEG C/h of heating rate, protects
Temperature 2 hours, is cooled to 300 DEG C with 30 DEG C/h of rate of temperature fall, so far completes a temperature control stage, repeat above-mentioned
The temperature control stage twice, is cooled to room temperature, and bar material is obtained.
(2) the bar material after casting does pickling and alkali cleaning is processed；Require according to the line footpath of bolt, bar material is carried out
Line is taken out, so that bar material is retracted to the line footpath needed for screw rod.The bar material shunk after line footpath is cut to into the length needed for bolt, normal
The bar material after cut-out is put under temperature and is coated with the mold cavity of plant ash, make bar material form the head needed for bolt with upset force
Portion and bar portion size；Bar material is pushed finally by the two panels dental lamina of reciprocating tooth roller, screw thread is rolled over by reciprocal action
Type is made, the external screw thread of bolt is formed, the first bolt is obtained.
(3) hot intensive treatment；First the first bolt is placed at 585 DEG C carries out first stage heat treatment 2 hours；Exist again
Second stage heat treatment is carried out at 615 DEG C 3 hours；Phase III carries out phase III heat treatment 3 hours at 635 DEG C, is obtained
Second bolt.
(4) heat treatment；External screw thread heat treatment and light bar segment heat treatment are carried out successively to the second bolt, the 3rd bolt is obtained；
Wherein, the process of external screw thread heat treatment is：The external screw thread of the second bolt is heated 4.5 little at 790～810 DEG C
When, then 1100 DEG C are warming up in 25 minutes, kept for 15 minutes heat time heating times, quenched with quenching oil, then by after quenching
Second bolt is tempered at 650 DEG C, 50 minutes persistent period, then the second bolt is taken out from tempering furnace is put into 290 DEG C
No. 200 solvent naphthas in oily slow cooling.
The process of light bar segment heat treatment is：By the light bar segment in the middle part of the second bolt at 790～810 DEG C, quenched with aqueouss
Liquid is quenched, then the bolt after quenching is tempered at 620 DEG C, 60 minutes persistent period, finally carries out Carburization Treatment,
Carburizer is sent in tempering furnace, in 1120 DEG C of Carburization Treatments 60min, the 3rd bolt is obtained.
(5) Ageing Treatment, the 3rd bolt after heat treatment is put in aging oven and is heated to 180 DEG C, is incubated 3 hours,
Then take out and naturally cool to room temperature, the 4th bolt is obtained.
(6) Passivation Treatment, the 4th bolt is immersed in the inactivating treatment liquid that temperature is 100～120 DEG C and processes 6min, be obtained
5th bolt；Inactivating treatment liquid is prepared from by the material mixing of following weight proportioning：8 parts of water-soluble molybdenum hydrochlorates, 12 part two
Ethanolamine, 70 parts of silicate, 90 parts of water soluble acrylic resins, 100 parts of water.
(7) Bononizing pretreatment, by weight：First 75 parts of borax anhydrouss are put in process container, 695 DEG C are heated to,
It is subsequently adding 13 parts of SiC powder to be stirred, treats that borax anhydrouss are completely melt, be warming up to 800 DEG C, add 9 parts of sodium carbonate, strengthens
It is stirred to bath temperature and reaches 910 DEG C, the 5th bolt is placed into into boronising in borax bath, bath temperature keeps 860 DEG C of constant temperature, when
Between 3.5 hours, naturally cool to room temperature, then carry out cleaning, air-dry, be obtained the 6th bolt.
(8) bonderizing；The sodium bicarbonate that the 6th bolt mass fraction is 12% is washed into 5 points at 60 DEG C first
Clock, is then washed with cold water, is soaked 7 minutes followed by 110 DEG C of etching solution, then is carried out washing, air-dries.
Above-mentioned etching solution is formed by the component proportion of following parts by weight：11 parts of potassium dihydrogen phosphates, 13 parts of carbon
Sour hydrogen sodium, 5 parts of Polyethylene Glycol, 12 parts of zinc nitrates, 150 parts of deionized waters.
(9) mechanical enhancer and surface treatment, first to bonderizing after the 6th bolt carry out heating and degrease, heating temperature
Spend for 340 DEG C, temperature retention time is 30min, naturally cools to room temperature；Secondly the 6th bolt Jing shot-blasting machines are carried out at the ball blast on surface
Reason, Jing hot water cleaning after having processed；Last 6th bolt makes bolt surface Quick Oxidation carrying out gas and air deflagrate
Blackening process, control 105 DEG C of temperature；25 minutes time；Carry out again cleaning, air-dry, get product bolt.
Jing after the method described by embodiment 1～3 repeats to prepare 5 batches of bolts, after testing, the mechanical performance such as table 1 of bolt
It is shown：
The mechanical performance of bolt prepared by 1. embodiment of table 1～3
In table 1, the method for testing of tensile strength and delayed fracture resistance is as follows：
(1) measure of tensile strength
The tensile strength of bolt follows JIS B1051 and carries out tensile test and try to achieve, and more than tensile strength 1200MPa is
It is qualified.
(2) evaluation of delayed fracture resistance
With regard to delayed fracture resistance, its enforcement is by, in 15% (mass fraction) HCl/water solution, bolt being impregnated 30
Minute, after washing and being dried, the certain load of load compares the load for not occurring to rupture for more than 100 hours.At this moment, use acid dip
There is no within more than 100 hours the load for rupturing afterwards, it is divided by acid dip is not carried out and the maximum load in tensile test, resulting
Value be defined as delayed fracture strength ratio, it is qualified that the value (delayed fracture strength ratio) is more than 0.70 judgement.
Claims (5)
1. the high-strength bolt alloy material of a kind of anti-delayed fracture, it is characterised in that include followingization according to percentage by weight
Study point：C0.2～0.5%；Si0.05～0.5%；Mn0.03～0.08%；P0.01～0.02%；S0.02～0.04%；
Cu0.1～0.16%；Co0.24～0.32%；Ni0.22～0.28%；Al0.08～0.24%；Ti0.12～0.26%；
Mo0.14～0.29%；V0.1～0.15%；Sm0.08～0.14%；Te0.04～0.06%；Neodymium iron boron 0.08～0.14%；
Balance of Fe and impurity element.
2. the high-strength bolt alloy material of anti-delayed fracture according to claim 1, it is characterised in that：The high intensity
In bolt alloy material, Al accounts for 0.12～0.18%.
3. the high-strength bolt alloy material of anti-delayed fracture according to claim 1, it is characterised in that：The high intensity
In bolt alloy material, Ti accounts for 0.14～0.2%.
4. the high-strength bolt alloy material of anti-delayed fracture according to claim 1, it is characterised in that：The high intensity
In bolt alloy material, Si accounts for 0.2～0.4%.
5. a kind of usage right requires the method that the high-strength bolt alloy material described in 1 to 4 any one manufactures bolt, its feature
It is to comprise the steps：
(1) bar material is cast, by bar material blank with chemical composition dispensing is compared, is obtained, the bar material blank moulding by casting is obtained bar
Material；
(2) pickling being carried out to the bar material and alkali cleaning being processed, the first bolt with external screw thread and light bar segment is obtained；
(3) hot intensive treatment is carried out to first bolt, the second bolt is obtained；
(4) heat treatment is carried out to second bolt, the 3rd bolt is obtained；
(5) Ageing Treatment is carried out to the 3rd bolt, the 4th bolt is obtained；
(6) process is passivated to the 4th bolt, the 5th bolt is obtained；
(7) Bononizing pretreatment is carried out to the 5th bolt, the 6th bolt is obtained；
(8) bonderizing is carried out to the 6th bolt；
The operating process of step (3) is：First bolt is carried out successively first stage heat treatment, second stage heat treatment and
Phase III heat treatment, is obtained the second bolt；The treatment temperature of the first stage heat treatment is 580～610 DEG C, process time
For 1～2h；The treatment temperature of the second stage heat treatment is 610～630 DEG C, and process time is 2～3h；The phase III
The treatment temperature of heat treatment is 630～650 DEG C, and process time is 2～3h；
In step (6), following parts by weight are included to the inactivating treatment liquid that the 4th bolt is carried out needed for the Passivation Treatment
Component：
In step (8), the group of following parts by weight is included to the etching solution that the 6th bolt is carried out needed for bonderizing
Point：
The operating process of step (4) is：External screw thread heat treatment and light bar segment heat treatment are carried out to second bolt, the 3rd is obtained
Bolt；
The operating process of the external screw thread heat treatment is：The external screw thread of second bolt is placed at 790～810 DEG C and heats 4
～5h；1000～1120 DEG C are warming up to, 10～20min is incubated；Quenching, by quenching after the second bolt at tempering at 650 DEG C
Reason 50min；The second bolt after by temper is placed in 280～300 DEG C of solvent naphtha with oily slow cooling；
The operating process of the light bar segment heat treatment is：The light bar segment of second bolt is placed at 790～810 DEG C and is quenched
Fire；50～the 70min of temper at 600～620 DEG C of the second bolt after by quenching；The second bolt after by temper is put
60～90min of Carburization Treatment at 1100～1120 DEG C, is obtained the 3rd bolt；
After step (8) also include step (9), mechanical enhancer and surface treatment, by bonderizing after the 6th bolt be placed in
20～40min is heated at 300～350 DEG C, is cooled to 20～25 DEG C；The surface of the 6th bolt after heating and cooling treatment is entered
Row Shot Blasting；The 6th bolt after by Shot Blasting is placed in 100 DEG C～110 DEG C lower surface 25～30min of blackening process；Clearly
Wash, be dried, finished product bolt；
In step (1), the process conditions of the moulding by casting are：Slab temperature is down to into 280～320 DEG C, is carried out at least one times
In the temperature control stage, room temperature is cooled to, bar material is obtained；The concrete operations in the temperature control stage every time are to be heated with the speed of 25 DEG C/h
To 600～700 DEG C, 1～2h is incubated, then 250～300 DEG C is cooled to the speed of 30 DEG C/h；
In step (5), the treatment temperature of the Ageing Treatment is 150～180 DEG C, and process time is 2～3h；
In step (6), the 4th bolt is immersed 5～8min in 100～120 DEG C of inactivating treatment liquid, the 5th bolt is obtained；
The operating process of step (7) is：70～90 parts of borax anhydrouss are put in process container, 650～720 DEG C is heated to, so
10～15 parts of SiC powder are added afterwards, are stirred to borax anhydrouss and are completely melt, are warming up to 780～825 DEG C；Add 8～12 parts of carbonic acid
Sodium, is warming up to 900～920 DEG C while stirring；5th bolt is inserted and carry out in above-mentioned process container Bononizing pretreatment, oozed
The temperature of boron process is 850～865 DEG C, and the Bononizing pretreatment time is 2～4h, is cooled to room temperature；Cleaning, dry, prepared 6th spiral shell
Bolt；
The operating process of step (8) is：6th bolt is washed into 4 at 50～60 DEG C with 12% sodium bicarbonate～
6min；Wash the 6th bolt；6th bolt is placed in into 5～8min of immersion in 100～110 DEG C of etching solution,
Clean, be dried.
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| 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 |
| CN110656286A (en) * | 2019-09-20 | 2020-01-07 | 江苏永昊高强度螺栓有限公司 | High-strength bolt and processing method thereof |
| CN114951573B (en) * | 2022-04-26 | 2024-04-02 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 12.9-grade fastener and production method thereof |
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| JP2003113440A (en) * | 2001-10-04 | 2003-04-18 | Nippon Steel Corp | Drawable high-tension steel sheet superior in shape freezability and manufacturing method therefor |
| CN1511969A (en) * | 2002-11-06 | 2004-07-14 | 大同特殊钢株式会社 | Alloy tool steel and its producing method and mold using it |
| JP4329883B1 (en) * | 2008-02-27 | 2009-09-09 | 住友金属工業株式会社 | Carburization-resistant metal material |
| CN101928886A (en) * | 2010-07-15 | 2010-12-29 | 南京钢铁股份有限公司 | Corrosion resistant steel for cargo oil tanks and application thereof |
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| TWI248977B (en) * | 2003-06-26 | 2006-02-11 | Nippon Steel Corp | High-strength hot-rolled steel sheet excellent in shape fixability and method of producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003113440A (en) * | 2001-10-04 | 2003-04-18 | Nippon Steel Corp | Drawable high-tension steel sheet superior in shape freezability and manufacturing method therefor |
| CN1511969A (en) * | 2002-11-06 | 2004-07-14 | 大同特殊钢株式会社 | Alloy tool steel and its producing method and mold using it |
| JP4329883B1 (en) * | 2008-02-27 | 2009-09-09 | 住友金属工業株式会社 | Carburization-resistant metal material |
| CN101928886A (en) * | 2010-07-15 | 2010-12-29 | 南京钢铁股份有限公司 | Corrosion resistant steel for cargo oil tanks and application thereof |
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