CN1072966A - New process of abnormal compound carbonitriding - Google Patents
New process of abnormal compound carbonitriding Download PDFInfo
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- CN1072966A CN1072966A CN 91106863 CN91106863A CN1072966A CN 1072966 A CN1072966 A CN 1072966A CN 91106863 CN91106863 CN 91106863 CN 91106863 A CN91106863 A CN 91106863A CN 1072966 A CN1072966 A CN 1072966A
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Abstract
A kind of new process of abnormal compound carbonitriding, it is carburizing when workpiece is warming up to 900-950 ℃, again with nitriding in the workpiece furnace cooling process, when being cooled to 500-600 ℃ the insulation certain hour, thereafter be rapidly heated to 800 ℃-900 ℃ insulation for some time, at last workpiece hung out stove and enter oil cooling to normal temperature.That the present invention has is simple to operate, obvious energy conservation, process stabilizing, positively effect that workpiece quality is high, is the new breakthrough of thermal treatment process technology.
Description
The present invention relates to a kind of thermal treatment process in the mechanical work.
In mechanical industry, the needs that require attrition resistant steel-iron components to have carry out carbonitriding.Its temperature of this technology commonly used now is in about 850 ℃, and its carbon concentration, nitrogen concentration and its infiltration layer concentration are all relatively lower shallow.If temperature is improved, carbon concentration can be put on, and depth of penetration also can comparatively fast increase deeply, but nitrogen concentration sharply descends, even does not have the nitriding effect.Otherwise, temperature is reduced, carbon concentration does not just increase, and its degree of depth is more shallow.Therefore, have the people to change technology into elder generation 550 ℃ of nitridings, again 920 ℃ of carburizings, the two composite demand is satisfied in attempt, but because the nitrogen that low temperature oozes, at high temperature denitrogenation or poor nitrogen phenomenon can take place, so this technology also exists some problems in insulation for a long time.
The present invention's purpose is intended to develop that a kind of carburizing nitrogen is effective, process stabilizing, workpiece quality are good, simple to operate, the New Technology of Heat Treatment of obvious energy conservation.
Technical solution of the present invention is; Carburizing certain hour when workpiece is warming up to 900-950 ℃ in stove, again with workpiece furnace cooling and nitriding in the furnace cooling process, when being cooled to 500-600 ℃, at this temperature insulation certain hour, thereafter be rapidly heated to 800-900 ℃, insulation for some time, workpiece is hung out enter oil cooling at last to normal temperature.
Fig. 1 is process curve figure of the present invention.
Be described further below in conjunction with accompanying drawing:
Process curve of the present invention is as shown in Figure 1: workpiece is warming up to 920-930 ℃ of carburizing certain hour; the length of time is determined by technical requirements; calculate by normal carburizing time; generally at 2-20 hour; workpiece is cooled to the furnace 550 ℃ again; and at this temperature insulation certain hour; be generally 2-4 hour; in workpiece furnace cooling process; the alternating temperature nitriding since 820 ℃ to 550 ℃; the carbon that infiltrates because of high temperature is difficult for decarburization or poor carbon because of there being certain density atmosphere to do protection again under low temperature thereafter, and its concentration ratio of the nitrogen that oozes at low temperatures is higher, has so not only guaranteed pyrocarbon concentration but also has guaranteed cryogenic nitrogen concentration.Because be chilled to 550 ℃ from 920 ° of-930 ℃ of stoves of high temperature, its speed of cooling is slower, the metallographic structure of the distribution of carbon concentration and workpiece inside is unreasonable, thereby influence the mechanical property of workpiece, so workpiece is risen to proper temperature fast from 550 ℃, according to the workpiece steel part and different, be generally between 820-870 ℃, and under this temperature, workpiece insulation about 30 minutes then hangs out workpiece and goes into oil cooling immediately to normal temperature, again according to technical requirements from stove Nei Mafu cylinder, carry out conventional temper, workpiece just can be on active service.Be rapidly heated to the process more than 850 ℃ from 550 ℃, because of the time short, its temperature has the nitriding atmosphere protection again from 920 ℃ far away, so the phenomenon of denitrogenation is unlikely serious in poor nitrogen degree, does not influence the nitriding effect.
This abnormal compound carbonitriding technology, it is simple to operate, and in the alternating temperature nitriding process, not power consumption basically, obvious energy conservation.Through the mechanical component of this art breading, its resistance to abrasion, corrosion-resistant all are better than conventional carbonitriding and compound carbonitriding greatly, because the multifactor single factor of carburizing+alternating temperature nitriding that becomes during with carbonitriding makes technology become process stabilizing by instability.It is a new breakthrough of thermal treatment circle Technology.
Claims (5)
1, a kind of new process of abnormal compound carbonitriding, carburizing certain hour when it is characterized in that workpiece is warming up to 900-950 ℃, again with workpiece furnace cooling and nitriding in the furnace cooling process, when being cooled to 500-600 ℃, at this temperature insulation certain hour, thereafter be rapidly heated to 800-900 ℃, insulation for some time, workpiece is hung out enter oil cooling at last to normal temperature.
2,, it is characterized in that described carburizing time is 2-20 hour according to the novel process of claim 1.
3,, it is characterized in that described 500-600 ℃ of insulation certain hour is 2-4 hour according to the novel process of claim 1.
4, according to the novel process of claim 1, it is characterized in that beginning nitriding in the described furnace cooling process, be in the time of 820 ℃, to begin nitriding.
5,, it is characterized in that described 800-900 ℃ of insulation for some time is half an hour according to the novel process of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91106863 CN1072966A (en) | 1991-12-03 | 1991-12-03 | New process of abnormal compound carbonitriding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91106863 CN1072966A (en) | 1991-12-03 | 1991-12-03 | New process of abnormal compound carbonitriding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1072966A true CN1072966A (en) | 1993-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91106863 Pending CN1072966A (en) | 1991-12-03 | 1991-12-03 | New process of abnormal compound carbonitriding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1072966A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348770C (en) * | 2004-05-15 | 2007-11-14 | 洛阳轴承集团有限公司 | Carburization technique of heat treatment for high temperature carburized steel (H10CrMo4Ni4V) |
| CN100464003C (en) * | 2006-08-31 | 2009-02-25 | 王永凯 | Temperature variable chemical heat treatment method general for high speed steel and hard alloy cutter |
-
1991
- 1991-12-03 CN CN 91106863 patent/CN1072966A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348770C (en) * | 2004-05-15 | 2007-11-14 | 洛阳轴承集团有限公司 | Carburization technique of heat treatment for high temperature carburized steel (H10CrMo4Ni4V) |
| CN100464003C (en) * | 2006-08-31 | 2009-02-25 | 王永凯 | Temperature variable chemical heat treatment method general for high speed steel and hard alloy cutter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |