CN103643018A - Thermal processing technology for bolts - Google Patents
Thermal processing technology for bolts Download PDFInfo
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- CN103643018A CN103643018A CN201310604884.7A CN201310604884A CN103643018A CN 103643018 A CN103643018 A CN 103643018A CN 201310604884 A CN201310604884 A CN 201310604884A CN 103643018 A CN103643018 A CN 103643018A
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Abstract
A disclosed thermal processing technology for bolts comprises the following steps: 1) pre-heating to-be-processed bolts for 4-5 h, pre-heating a furnace to a temperature of 360-370 DEG C; 2) performing carburization processing; 3) keeping the bolts in a salt bath furnace with a temperature of 600-620 DEG C for 5-6 h and quenching; 4) performing first-stage quenching, employing a nitrate quenching agent and quenching to 500-510 DEG C with a constant velocity of 50-55 DEG C/min, wherein the nitrate quenching agent is a quenching agent prepared by mixing potassium nitrate and sodium nitrate with a mass ratio of 2:1; 5) performing second-state quenching, employing a nitrate quenching agent and quenching to 100-110 DEG C, wherein the nitrate quenching agent is a quenching agent prepared by mixing potassium nitrate and sodium nitrate with a mass ratio of 1:2; 6) performing third-stage quenching, employing hot water with a temperature of 200-205 DEG C and quenching to 230-235 DEG C; and 7) keeping the bolts in a tempering furnace with a temperature of 300-305 DEG C for 8-10 h, and cooling in air to room temperature. By employing the thermal processing technology for the bolts, the prepared bolts are small in cross-section shrinkage, improved in match rate and reduced in rejection rate, and cyanide penetrating agents harmful to human body and environment are avoided.
Description
Technical field
The present invention relates to the thermal treatment process of bolt.
Background technology
The treatment process of the bolt that intensity is high is to adopt carburizing or cyaniding to add the techniques such as Q-tempering to process, and adopt the 850-900 ℃ of insulation Full Annealing technique of 10 hours, but utilize bolt relative reduction in area when quenching of this explained hereafter larger, deformation rate is large, low with the fit rate of nut, scrap rate surpasses 10% sometimes.
Summary of the invention
The object of the present invention is to provide a kind of thermal treatment process of bolt, the bolt relative reduction in area that it makes is little, and fit rate improves, and scrap rate reduces, and avoids using human body and the harmful Cyanides penetration enhancer of environment.
For achieving the above object, technical scheme of the present invention is the thermal treatment process of a kind of bolt of design, comprises the steps:
1) by pending bolt preheating 4-5 hour, preheating oven furnace temperature 360-370 ℃;
2) carburizing treatment;
3) in the salt bath furnace of 600-620 ℃, be incubated 5-6 hour again and quench, saline solution adopts the mixing solutions of the sodium-chlor that Repone K that concentration is 80-90g/L, sodium sulfate that concentration is 200-210g/L, saltpetre that concentration is 100-110g/L and concentration are 180-190g/L;
4) first stage quenches, and adopts salt made from earth containing a comparatively high percentage of sodium chloride to be at the uniform velocity quenched to 500-510 ℃ with 50-55 ℃/min, and described nitrate quenching agent is the quenching medium that saltpetre and SODIUMNITRATE are mixed by the mass ratio of 2:1;
5) subordinate phase is quenched, and adopts salt made from earth containing a comparatively high percentage of sodium chloride constant temperature to be quenched to 100-110 ℃, and described nitrate quenching agent is the quenching medium that saltpetre and SODIUMNITRATE are mixed by the mass ratio of 1:2;
6) phase III quenches, and adopts 200-205 ℃ of hot water to be quenched to 230-235 ℃;
7) in the tempering stove of 300-305 ℃, be incubated 8-10 hour again after air cooling to normal temperature.
Advantage of the present invention and beneficial effect are: a kind of thermal treatment process of bolt is provided, and the bolt relative reduction in area that it makes is little, and fit rate improves, and scrap rate reduces, and avoid using human body and the harmful Cyanides penetration enhancer of environment.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is further described.Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
The concrete technical scheme of implementing of the present invention is:
Embodiment 1
A thermal treatment process for bolt, comprises the steps:
1) by pending bolt preheating 4 hours, 360 ℃ of preheating oven furnace temperature;
2) carburizing treatment;
3) in the salt bath furnace of 600 ℃, be incubated 5 hours again and quench, saline solution adopts the mixing solutions of the sodium-chlor that Repone K that concentration is 80g/L, sodium sulfate that concentration is 200g/L, saltpetre that concentration is 100g/L and concentration are 180g/L;
4) first stage quenches, and adopts salt made from earth containing a comparatively high percentage of sodium chloride to be at the uniform velocity quenched to 500 ℃ with 50 ℃/min, and described nitrate quenching agent is the quenching medium that saltpetre and SODIUMNITRATE are mixed by the mass ratio of 2:1;
5) subordinate phase is quenched, and adopts salt made from earth containing a comparatively high percentage of sodium chloride constant temperature to be quenched to 100 ℃, and described nitrate quenching agent is the quenching medium that saltpetre and SODIUMNITRATE are mixed by the mass ratio of 1:2;
6) phase III quenches, and adopts 200 ℃ of hot water to be quenched to 230 ℃;
7) in the tempering stove of 300 ℃, be incubated 8 hours again after air cooling to normal temperature.
Embodiment 2
A thermal treatment process for bolt, comprises the steps:
1) by pending bolt preheating 5 hours, 370 ℃ of preheating oven furnace temperature;
2) carburizing treatment;
3) in the salt bath furnace of 620 ℃, be incubated 6 hours again and quench, saline solution adopts the mixing solutions of the sodium-chlor that Repone K that concentration is 90g/L, sodium sulfate that concentration is 210g/L, saltpetre that concentration is 110g/L and concentration are 190g/L;
4) first stage quenches, and adopts salt made from earth containing a comparatively high percentage of sodium chloride to be at the uniform velocity quenched to 510 ℃ with 55 ℃/min, and described nitrate quenching agent is the quenching medium that saltpetre and SODIUMNITRATE are mixed by the mass ratio of 2:1;
5) subordinate phase is quenched, and adopts salt made from earth containing a comparatively high percentage of sodium chloride constant temperature to be quenched to 110 ℃, and described nitrate quenching agent is the quenching medium that saltpetre and SODIUMNITRATE are mixed by the mass ratio of 1:2;
6) phase III quenches, and adopts 205 ℃ of hot water to be quenched to 235 ℃;
7) in the tempering stove of 305 ℃, be incubated 10 hours again after air cooling to normal temperature.
Embodiment 3
A thermal treatment process for bolt, comprises the steps:
1) by pending bolt preheating 4.5 hours, 365 ℃ of preheating oven furnace temperature;
2) carburizing treatment;
3) in the salt bath furnace of 610 ℃, be incubated 5.5 hours again and quench, saline solution adopts the mixing solutions of the sodium-chlor that Repone K that concentration is 85g/L, sodium sulfate that concentration is 204g/L, saltpetre that concentration is 107g/L and concentration are 183g/L;
4) first stage quenches, and adopts salt made from earth containing a comparatively high percentage of sodium chloride to be at the uniform velocity quenched to 504 ℃ with 52 ℃/min, and described nitrate quenching agent is the quenching medium that saltpetre and SODIUMNITRATE are mixed by the mass ratio of 2:1;
5) subordinate phase is quenched, and adopts salt made from earth containing a comparatively high percentage of sodium chloride constant temperature to be quenched to 105 ℃, and described nitrate quenching agent is the quenching medium that saltpetre and SODIUMNITRATE are mixed by the mass ratio of 1:2;
6) phase III quenches, and adopts 203 ℃ of hot water to be quenched to 232 ℃;
7) in the tempering stove of 301 ℃, be incubated 9 hours again after air cooling to normal temperature.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. the thermal treatment process of bolt, is characterized in that, comprises the steps:
1) by pending bolt preheating 4-5 hour, preheating oven furnace temperature 360-370 ℃;
2) carburizing treatment;
3) in the salt bath furnace of 600-620 ℃, be incubated 5-6 hour again and quench, saline solution adopts the mixing solutions of the sodium-chlor that Repone K that concentration is 80-90g/L, sodium sulfate that concentration is 200-210g/L, saltpetre that concentration is 100-110g/L and concentration are 180-190g/L;
4) first stage quenches, and adopts salt made from earth containing a comparatively high percentage of sodium chloride to be at the uniform velocity quenched to 500-510 ℃ with 50-55 ℃/min, and described nitrate quenching agent is the quenching medium that saltpetre and SODIUMNITRATE are mixed by the mass ratio of 2:1;
5) subordinate phase is quenched, and adopts salt made from earth containing a comparatively high percentage of sodium chloride constant temperature to be quenched to 100-110 ℃, and described nitrate quenching agent is the quenching medium that saltpetre and SODIUMNITRATE are mixed by the mass ratio of 1:2;
6) phase III quenches, and adopts 200-205 ℃ of hot water to be quenched to 230-235 ℃;
7) in the tempering stove of 300-305 ℃, be incubated 8-10 hour again after air cooling to normal temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310604884.7A CN103643018A (en) | 2013-11-26 | 2013-11-26 | Thermal processing technology for bolts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310604884.7A CN103643018A (en) | 2013-11-26 | 2013-11-26 | Thermal processing technology for bolts |
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| CN103643018A true CN103643018A (en) | 2014-03-19 |
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| CN201310604884.7A Pending CN103643018A (en) | 2013-11-26 | 2013-11-26 | Thermal processing technology for bolts |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104775015A (en) * | 2015-04-21 | 2015-07-15 | 柳州凡一科技有限公司 | Method for heat treatment of ship plate of rice transplanter |
| CN106048682A (en) * | 2016-08-08 | 2016-10-26 | 常熟市常力紧固件有限公司 | Production technology of corrosion-resistant bolt for automobile transmission system |
| CN106555036A (en) * | 2016-12-07 | 2017-04-05 | 河池市技术开发中心 | A kind of bolt Technology for Heating Processing |
| CN106801212A (en) * | 2016-12-12 | 2017-06-06 | 长江大学 | Heat treatment process for prolonging service life of high-pressure manifold |
| CN107414420A (en) * | 2017-07-21 | 2017-12-01 | 南通安赛乐紧固件有限公司 | A kind of processing technology of high-strength large hexagon head bolt used for steel structure |
| CN107598483A (en) * | 2017-07-21 | 2018-01-19 | 南通安赛乐紧固件有限公司 | A kind of high strength steel rack bolt processing technology |
| CN104480477B (en) * | 2014-11-20 | 2018-02-16 | 海盐汇联通用配件有限公司 | A kind of anti-corrosion and high strength hex bolts production technology |
| CN109628718A (en) * | 2017-10-09 | 2019-04-16 | 徐州东鹏工具制造有限公司 | A kind of heat treatment process of bolt |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4437905A (en) * | 1979-12-05 | 1984-03-20 | Nippon Steel Corporation | Process for continuously annealing a cold-rolled low carbon steel strip |
| CN102851479A (en) * | 2011-06-29 | 2013-01-02 | 徐州市瑞达高强度紧固件厂 | Heat treatment technology of high-strength bolt |
| CN102995029A (en) * | 2012-11-27 | 2013-03-27 | 宁波腾玲工贸有限公司 | Heat treatment process of bolt processing |
| CN103122405A (en) * | 2011-11-21 | 2013-05-29 | 郑州水野大一热处理技术有限公司 | Heat treatment technology of high-strength bolt |
-
2013
- 2013-11-26 CN CN201310604884.7A patent/CN103643018A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4437905A (en) * | 1979-12-05 | 1984-03-20 | Nippon Steel Corporation | Process for continuously annealing a cold-rolled low carbon steel strip |
| CN102851479A (en) * | 2011-06-29 | 2013-01-02 | 徐州市瑞达高强度紧固件厂 | Heat treatment technology of high-strength bolt |
| CN103122405A (en) * | 2011-11-21 | 2013-05-29 | 郑州水野大一热处理技术有限公司 | Heat treatment technology of high-strength bolt |
| CN102995029A (en) * | 2012-11-27 | 2013-03-27 | 宁波腾玲工贸有限公司 | Heat treatment process of bolt processing |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480477B (en) * | 2014-11-20 | 2018-02-16 | 海盐汇联通用配件有限公司 | A kind of anti-corrosion and high strength hex bolts production technology |
| CN104775015A (en) * | 2015-04-21 | 2015-07-15 | 柳州凡一科技有限公司 | Method for heat treatment of ship plate of rice transplanter |
| CN106048682A (en) * | 2016-08-08 | 2016-10-26 | 常熟市常力紧固件有限公司 | Production technology of corrosion-resistant bolt for automobile transmission system |
| CN106555036A (en) * | 2016-12-07 | 2017-04-05 | 河池市技术开发中心 | A kind of bolt Technology for Heating Processing |
| CN106801212A (en) * | 2016-12-12 | 2017-06-06 | 长江大学 | Heat treatment process for prolonging service life of high-pressure manifold |
| CN106801212B (en) * | 2016-12-12 | 2019-01-01 | 长江大学 | Heat treatment process for prolonging service life of high-pressure manifold |
| CN107414420A (en) * | 2017-07-21 | 2017-12-01 | 南通安赛乐紧固件有限公司 | A kind of processing technology of high-strength large hexagon head bolt used for steel structure |
| CN107598483A (en) * | 2017-07-21 | 2018-01-19 | 南通安赛乐紧固件有限公司 | A kind of high strength steel rack bolt processing technology |
| CN109628718A (en) * | 2017-10-09 | 2019-04-16 | 徐州东鹏工具制造有限公司 | A kind of heat treatment process of bolt |
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Application publication date: 20140319 |