CN106755882A - The Technology for Heating Processing of bolt - Google Patents
The Technology for Heating Processing of bolt Download PDFInfo
- Publication number
- CN106755882A CN106755882A CN201510830074.2A CN201510830074A CN106755882A CN 106755882 A CN106755882 A CN 106755882A CN 201510830074 A CN201510830074 A CN 201510830074A CN 106755882 A CN106755882 A CN 106755882A
- Authority
- CN
- China
- Prior art keywords
- quenching
- nitrate
- quenched
- bolt
- hours
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/46—Salt baths
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/607—Molten salts
-
- 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
-
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of Technology for Heating Processing of bolt, comprise the following steps：1) pending bolt is preheated 4-5 hours, 360-370 DEG C of preheating furnace furnace temperature；2) Carburization Treatment；3) it is incubated in 600-620 DEG C of salt bath furnace again and is quenched for 5-6 hours；4) first stage quenching, uses salt made from earth containing a comparatively high percentage of sodium chloride to be at the uniform velocity quenched to 500-510 DEG C with 50-55 DEG C/min, and the nitrate quenching agent is that potassium nitrate and sodium nitrate press 2:The quenching medium of 1 mass ratio mixing；5) second stage quenching, 100-110 DEG C is quenched to using salt made from earth containing a comparatively high percentage of sodium chloride constant temperature, and the nitrate quenching agent is that potassium nitrate and sodium nitrate press 1:The quenching medium of 2 mass ratio mixing；6) phase III quenching, 230-235 DEG C is quenched to using 200-205 DEG C of hot water；7) the tempering furnace inside holding again at 300-305 DEG C is air cooled to normal temperature after 8-10 hours.The Technology for Heating Processing of the bolt that the present invention is provided, its obtained bolt contraction percentage of area is small, and fit rate is improved, percent defective reduction, and avoids using to human body and the harmful Cyanides penetration enhancer of environment.
Description
Technical field
The present invention relates to the Technology for Heating Processing of bolt.
Background technology
The handling process of intensity bolt high is processed using the technique such as carburizing or cyaniding plus Q-tempering, and small using 850-900 DEG C of insulation 10
When full annealing technique, but using the technique productions bolt in quenching the contraction percentage of area it is larger, deformation rate is big, and the fit rate with nut is low,
Percent defective is sometimes more than 10%.
The content of the invention
It is an object of the invention to provide a kind of Technology for Heating Processing of bolt, its obtained bolt contraction percentage of area is small, and fit rate is improved, percent defective
Reduce, and avoid using to human body and the harmful Cyanides penetration enhancer of environment.
To achieve the above object, the technical scheme is that designing a kind of Technology for Heating Processing of bolt, comprise the following steps：
1) pending bolt is preheated 4-5 hours, 360-370 DEG C of preheating furnace furnace temperature；
2) Carburization Treatment；
3) it is incubated in 600-620 DEG C of salt bath furnace again and is quenched for 5-6 hours, saline solution uses the concentration to be for the potassium chloride of 80-90g/L, concentration
The sodium sulphate of 200-210g/L, concentration are that the potassium nitrate and concentration of 100-110g/L are the mixed solution of the sodium chloride of 180-190g/L；
4) first stage quenching, uses salt made from earth containing a comparatively high percentage of sodium chloride to be at the uniform velocity quenched to 500-510 DEG C with 50-55 DEG C/min, and the nitrate quenching agent is potassium nitrate and nitric acid
Sodium presses 2:The quenching medium of 1 mass ratio mixing；
5) second stage quenching, 100-110 DEG C is quenched to using salt made from earth containing a comparatively high percentage of sodium chloride constant temperature, and the nitrate quenching agent is that potassium nitrate and sodium nitrate press 1:2 mass ratio
The quenching medium of mixing；
6) phase III quenching, 230-235 DEG C is quenched to using 200-205 DEG C of hot water；
7) the tempering furnace inside holding again at 300-305 DEG C is air cooled to normal temperature after 8-10 hours.
The advantages of the present invention are：A kind of Technology for Heating Processing of bolt is provided, its obtained bolt contraction percentage of area is small, fit rate
Improve, percent defective reduction, and avoid using to human body and the harmful Cyanides penetration enhancer of environment.
Specific embodiment
With reference to embodiment, specific embodiment of the invention is further described.Following examples are only used for clearly illustrating this hair
Bright technical scheme, and can not be limited the scope of the invention with this.
The present invention specific implementation technical scheme be：A kind of Technology for Heating Processing of the bolt of embodiment 1, comprises the following steps：
1) pending bolt is preheated 4 hours, 360 DEG C of preheating furnace furnace temperature；
2) Carburization Treatment；
3) it is incubated in 600 DEG C of salt bath furnace again and is quenched for 5 hours, saline solution uses potassium chloride, sulphur that concentration be 200g/L of the concentration for 80g/L
Sour sodium, concentration are the mixed solution of the sodium chloride of 180g/L for the potassium nitrate and concentration of 100g/L；
4) first stage quenching, uses salt made from earth containing a comparatively high percentage of sodium chloride to be at the uniform velocity quenched to 500 DEG C with 50 DEG C/min, and the nitrate quenching agent is that potassium nitrate and sodium nitrate press 2:1
Mass ratio mixing quenching medium；
5) second stage quenching, 100 DEG C are quenched to using salt made from earth containing a comparatively high percentage of sodium chloride constant temperature, and the nitrate quenching agent is that potassium nitrate and sodium nitrate press 1:2 mass ratio mixing
Quenching medium；
6) phase III quenching, 230 DEG C are quenched to using 200 DEG C of hot water；
7) the tempering furnace inside holding again at 300 DEG C is air cooled to normal temperature after 8 hours.
Embodiment 2
A kind of Technology for Heating Processing of bolt, comprises the following steps：
1) pending bolt is preheated 5 hours, 370 DEG C of preheating furnace furnace temperature；
2) Carburization Treatment；
3) it is incubated in 620 DEG C of salt bath furnace again and is quenched for 6 hours, it is 210g/L's for the potassium chloride of 90g/L, concentration that saline solution uses concentration
Sodium sulphate, concentration are the mixed solution of the sodium chloride of 190g/L for the potassium nitrate and concentration of 110g/L；
4) first stage quenching, uses salt made from earth containing a comparatively high percentage of sodium chloride to be at the uniform velocity quenched to 510 DEG C with 55 DEG C/min, and the nitrate quenching agent is that potassium nitrate and sodium nitrate press 2:1
Mass ratio mixing quenching medium；
5) second stage quenching, 110 DEG C are quenched to using salt made from earth containing a comparatively high percentage of sodium chloride constant temperature, and the nitrate quenching agent is that potassium nitrate and sodium nitrate are pressed
1:The quenching medium of 2 mass ratio mixing；
6) phase III quenching, 235 DEG C are quenched to using 205 DEG C of hot water；
7) the tempering furnace inside holding again at 305 DEG C is air cooled to normal temperature after 10 hours.
Embodiment 3
A kind of Technology for Heating Processing of bolt, comprises the following steps：
1) pending bolt is preheated 4.5 hours, 365 DEG C of preheating furnace furnace temperature；
2) Carburization Treatment；
3) it is incubated in 610 DEG C of salt bath furnace again and is quenched for 5.5 hours, it is 204g/L's for the potassium chloride of 85g/L, concentration that saline solution uses concentration
Sodium sulphate, concentration are the mixed solution of the sodium chloride of 183g/L for the potassium nitrate and concentration of 107g/L；
4) first stage quenching, uses salt made from earth containing a comparatively high percentage of sodium chloride to be at the uniform velocity quenched to 504 DEG C with 52 DEG C/min, and the nitrate quenching agent is that potassium nitrate and sodium nitrate press 2:1
Mass ratio mixing quenching medium；
5) second stage quenching, 105 DEG C are quenched to using salt made from earth containing a comparatively high percentage of sodium chloride constant temperature, and the nitrate quenching agent is that potassium nitrate and sodium nitrate are pressed
1:The quenching medium of 2 mass ratio mixing；
6) phase III quenching, 232 DEG C are quenched to using 203 DEG C of hot water；
7) the tempering furnace inside holding again at 301 DEG C is air cooled to normal temperature after 9 hours.
The above is only the preferred embodiment of the present invention, it is noted that for those skilled in the art, is not departing from the present invention
On the premise of know-why, some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (1)
1. the Technology for Heating Processing of bolt, it is characterised in that comprise the following steps：
1) pending bolt is preheated 4-5 hours, 360-370 DEG C of preheating furnace furnace temperature；
2) Carburization Treatment；
3) it is incubated in 600-620 DEG C of salt bath furnace again and is quenched for 5-6 hours, saline solution uses the concentration to be for the potassium chloride of 80-90g/L, concentration
The sodium sulphate of 200-210g/L, concentration are that the potassium nitrate and concentration of 100-110g/L are the mixed solution of the sodium chloride of 180-190g/L；
4) first stage quenching, uses salt made from earth containing a comparatively high percentage of sodium chloride to be at the uniform velocity quenched to 500-510 DEG C with 50-55 DEG C/min, and the nitrate quenching agent is potassium nitrate and nitric acid
Sodium presses 2:The quenching medium of 1 mass ratio mixing；
5) second stage quenching, 100-110 DEG C is quenched to using salt made from earth containing a comparatively high percentage of sodium chloride constant temperature, and the nitrate quenching agent is that potassium nitrate and sodium nitrate press 1:2 mass ratio
The quenching medium of mixing；
6) phase III quenching, 230-235 DEG C is quenched to using 200-205 DEG C of hot water；
7) the tempering furnace inside holding again at 300-305 DEG C is air cooled to normal temperature after 8-10 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510830074.2A CN106755882A (en) | 2015-11-25 | 2015-11-25 | The Technology for Heating Processing of bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510830074.2A CN106755882A (en) | 2015-11-25 | 2015-11-25 | The Technology for Heating Processing of bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106755882A true CN106755882A (en) | 2017-05-31 |
Family
ID=58964023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510830074.2A Pending CN106755882A (en) | 2015-11-25 | 2015-11-25 | The Technology for Heating Processing of bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106755882A (en) |
-
2015
- 2015-11-25 CN CN201510830074.2A patent/CN106755882A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170531 |
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| WD01 | Invention patent application deemed withdrawn after publication |