CN108148954A - The heat treatment process of bolt - Google Patents
The heat treatment process of bolt Download PDFInfo
- Publication number
- CN108148954A CN108148954A CN201611105083.6A CN201611105083A CN108148954A CN 108148954 A CN108148954 A CN 108148954A CN 201611105083 A CN201611105083 A CN 201611105083A CN 108148954 A CN108148954 A CN 108148954A
- Authority
- CN
- China
- Prior art keywords
- nitrate
- quenched
- bolt
- hours
- sodium
- 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
Links
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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
-
- 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of heat treatment process of bolt, include the following steps：1) pending bolt is preheated 45 hours, 360 370 DEG C of preheating furnace furnace temperature；2) Carburization Treatment；3) 56 hours are kept the temperature in 600 620 DEG C of salt bath furnace again to be quenched；4) first stage quenches, and salt made from earth containing a comparatively high percentage of sodium chloride is used at the uniform velocity to be quenched to 500 510 DEG C with 50 55 DEG C/min, the nitrate quenching agent presses 2 for potassium nitrate and sodium nitrate:The quenching medium of 1 mass ratio mixing；5) second stage quenches, and is quenched to 100 110 DEG C using salt made from earth containing a comparatively high percentage of sodium chloride constant temperature, the nitrate quenching agent presses 1 for potassium nitrate and sodium nitrate:The quenching medium of 2 mass ratio mixing；6) phase III quenches, and 230 235 DEG C are 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 room temperature after 8 10 hours.The heat treatment process of bolt provided by the invention, the bolt contraction percentage of area obtained is small, and fit rate improves, and rejection rate reduces, and avoids using the Cyanides penetration enhancer being harmful to human body and environment.
Description
Technical field
The present invention relates to the heat treatment process of bolt.
Background technology
The treatment process of the high bolt of intensity is the techniques such as Q-tempering to be added to be handled, and adopt using carburizing or cyaniding
With the 850-900 DEG C of heat preservation full annealing technique of 10 hours, but using the technique productions bolt in quenching the contraction percentage of area
Larger, deformation rate is big, and low with the fit rate of nut, rejection rate is sometimes more than 10%.
Invention content
The purpose of the present invention is to provide a kind of heat treatment process of bolt, the bolt contraction percentage of area obtained is small, matches
Conjunction rate improves, and rejection rate reduces, and avoids using the Cyanides penetration enhancer being harmful to human body and environment.
To achieve the above object, the technical scheme is that a kind of heat treatment process of bolt is designed, including walking as follows
Suddenly：
1) pending bolt is preheated 4-5 hours, 360-370 DEG C of preheating furnace furnace temperature；
2) Carburization Treatment；
3) it keeps the temperature 5-6 hours in 600-620 DEG C of salt bath furnace again to be quenched, saline solution is using a concentration of 80-90g/L's
Potassium chloride, the sodium sulphate of a concentration of 200-210g/L, the potassium nitrate of a concentration of 100-110g/L and a concentration of 180-190g/L
The mixed solution of sodium chloride；
4) first stage quenches, and salt made from earth containing a comparatively high percentage of sodium chloride is used at the uniform velocity to be quenched to 500-510 DEG C with 50-55 DEG C/min, the nitrate quenching
Agent presses 2 for potassium nitrate and sodium nitrate:The quenching medium of 1 mass ratio mixing；
5) second stage quenches, and is quenched to 100-110 DEG C using salt made from earth containing a comparatively high percentage of sodium chloride constant temperature, the nitrate quenching agent is potassium nitrate and nitre
Sour sodium presses 1:The quenching medium of 2 mass ratio mixing；
6) phase III quenches, and 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 room temperature after 8-10 hours.
The advantages of the present invention are：A kind of heat treatment process of bolt, bolt section obtained are provided
Shrinking percentage is small, and fit rate improves, and rejection rate reduces, and avoids using the Cyanides penetration enhancer being harmful to human body and environment.
Specific embodiment
With reference to embodiment, the specific embodiment of the present invention is further described.Following embodiment is only used for more
Add and clearly demonstrate technical scheme of the present invention, and be not intended to limit the protection scope of the present invention and limit the scope of the invention.
The technical solution that the present invention is embodied is：A kind of heat treatment process of 1 bolt of embodiment, includes the following steps：
1) pending bolt is preheated 4 hours, 360 DEG C of preheating furnace furnace temperature；
2) Carburization Treatment；
3) 5 hours are kept the temperature in 600 DEG C of salt bath furnace again to be quenched, saline solution using a concentration of 80g/L potassium chloride, dense
Spend the mixed solution of the sodium chloride of the sodium sulphate for 200g/L, the potassium nitrate of a concentration of 100g/L and a concentration of 180g/L；
4) first stage quenches, and salt made from earth containing a comparatively high percentage of sodium chloride is used at the uniform velocity to be quenched to 500 DEG C with 50 DEG C/min, the nitrate quenching agent is nitre
Sour potassium and sodium nitrate press 2:The quenching medium of 1 mass ratio mixing；
5) second stage quenches, and is quenched to 100 DEG C using salt made from earth containing a comparatively high percentage of sodium chloride constant temperature, the nitrate quenching agent is potassium nitrate and sodium nitrate
By 1:The quenching medium of 2 mass ratio mixing；
6) phase III quenches, and 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 room temperature after 8 hours.
Embodiment 2
A kind of heat treatment process of bolt, includes the following steps：
1) pending bolt is preheated 5 hours, 370 DEG C of preheating furnace furnace temperature；
2) Carburization Treatment；
3) 6 hours are kept the temperature in 620 DEG C of salt bath furnace again to be quenched, saline solution using a concentration of 90g/L potassium chloride, dense
Spend the mixed solution of the sodium chloride of the sodium sulphate for 210g/L, the potassium nitrate of a concentration of 110g/L and a concentration of 190g/L；
4) first stage quenches, and salt made from earth containing a comparatively high percentage of sodium chloride is used at the uniform velocity to be quenched to 510 DEG C with 55 DEG C/min, the nitrate quenching agent is nitre
Sour potassium and sodium nitrate press 2:The quenching medium of 1 mass ratio mixing；
5) second stage quenches, and is quenched to 110 DEG C using salt made from earth containing a comparatively high percentage of sodium chloride constant temperature, the nitrate quenching agent is potassium nitrate and sodium nitrate
By 1:The quenching medium of 2 mass ratio mixing；
6) phase III quenches, and 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 room temperature after 10 hours.
Embodiment 3
A kind of heat treatment process of bolt, includes the following steps：
1) pending bolt is preheated 4.5 hours, 365 DEG C of preheating furnace furnace temperature；
2) Carburization Treatment；
3) 5.5 hours are kept the temperature in 610 DEG C of salt bath furnace again to be quenched, saline solution using a concentration of 85g/L potassium chloride,
The mixed solution of the sodium chloride of the sodium sulphate of a concentration of 204g/L, the potassium nitrate of a concentration of 107g/L and a concentration of 183g/L；
4) first stage quenches, and salt made from earth containing a comparatively high percentage of sodium chloride is used at the uniform velocity to be quenched to 504 DEG C with 52 DEG C/min, the nitrate quenching agent is nitre
Sour potassium and sodium nitrate press 2:The quenching medium of 1 mass ratio mixing；
5) second stage quenches, and is quenched to 105 DEG C using salt made from earth containing a comparatively high percentage of sodium chloride constant temperature, the nitrate quenching agent is potassium nitrate and sodium nitrate
By 1:The quenching medium of 2 mass ratio mixing；
6) phase III quenches, and 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 room temperature after 9 hours.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (1)
1. the heat treatment process of bolt, which is characterized in that include 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 keeps the temperature 5-6 hours in 600-620 DEG C of salt bath furnace again to be quenched, saline solution uses the chlorination of a concentration of 80-90g/L
The chlorination of potassium, the sodium sulphate of a concentration of 200-210g/L, the potassium nitrate of a concentration of 100-110g/L and a concentration of 180-190g/L
The mixed solution of sodium；
4) first stage quenches, and salt made from earth containing a comparatively high percentage of sodium chloride is used at the uniform velocity to be quenched to 500-510 DEG C with 50-55 DEG C/min, the nitrate quenching agent is
Potassium nitrate and sodium nitrate press 2:The quenching medium of 1 mass ratio mixing；
5) second stage quenches, and is quenched to 100-110 DEG C using salt made from earth containing a comparatively high percentage of sodium chloride constant temperature, the nitrate quenching agent is potassium nitrate and sodium nitrate
By 1:The quenching medium of 2 mass ratio mixing；
6) phase III quenches, and 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 room temperature after 8-10 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611105083.6A CN108148954A (en) | 2016-12-05 | 2016-12-05 | The heat treatment process of bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611105083.6A CN108148954A (en) | 2016-12-05 | 2016-12-05 | The heat treatment process of bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108148954A true CN108148954A (en) | 2018-06-12 |
Family
ID=62470991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611105083.6A Pending CN108148954A (en) | 2016-12-05 | 2016-12-05 | The heat treatment process of bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108148954A (en) |
-
2016
- 2016-12-05 CN CN201611105083.6A patent/CN108148954A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103643018A (en) | Thermal processing technology for bolts | |
| CN107109615B (en) | Enhanced activation of self-passivating metals | |
| CN105349749A (en) | Bolt heat treatment technology | |
| CN102995029A (en) | Heat treatment process of bolt processing | |
| CN103757181A (en) | High-strength nut heat treatment technology | |
| CN108148954A (en) | The heat treatment process of bolt | |
| CN102994707A (en) | Heat treatment process in high-strength nut processing | |
| CN106755779A (en) | The Technology for Heating Processing of bolt | |
| CN105714067A (en) | Heat treatment process for bolt | |
| CN105779738A (en) | Heat treatment technology of bolt | |
| CN106755882A (en) | The Technology for Heating Processing of bolt | |
| CN106755781A (en) | The Technology for Heating Processing of bolt | |
| CN106579298A (en) | Alkaline baking salt and preparation method thereof | |
| CN106555036A (en) | A kind of bolt Technology for Heating Processing | |
| CN105714239A (en) | Nitriding process for pin | |
| EA201891450A1 (en) | IMPROVED METHOD FOR TREATING MAGNESIUM CHLORIDE SOLUTIONS AND METHOD FOR OBTAINING CARBONIC ACIDS | |
| RU2814340C1 (en) | Method of heat treatment of steel | |
| CN109628718A (en) | A kind of heat treatment process of bolt | |
| US1985456A (en) | Method of treating metals | |
| US1379722A (en) | Case-hardening compound and method of using same | |
| CN106676461B (en) | A kind of high ferro microalloying Rare Earth Treated Steel and its preparation process | |
| US1241112A (en) | Process for the treatment of iron or steel. | |
| Herring | Tool Steel Heat Treatment | |
| CN106893835A (en) | A kind of Technology for Heating Processing of rocking arm | |
| CN106757059A (en) | A kind of Technology for Heating Processing of rocking arm |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180612 |
|
| WD01 | Invention patent application deemed withdrawn after publication |