CN1072966A - Novel process for unconventional carbonitriding - Google Patents
Novel process for unconventional carbonitriding Download PDFInfo
- Publication number
- 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
- Authority
- CN
- China
- Prior art keywords
- workpiece
- novel process
- carbonitriding
- nitriding
- insulation
- 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.)
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005256 carbonitriding Methods 0.000 title claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000005255 carburizing Methods 0.000 claims abstract description 9
- 238000005121 nitriding Methods 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
A process for preparing the non-conventional composite carbonitriding alloy includes such steps as heating workpiece to 900-950 deg.C, carburizing, cooling to 500-600 deg.C, holding the temp for a certain time, quickly heating to 800-900 deg.C, and cooling. The invention has the advantages of simple operation, obvious energy saving, stable process and high workpiece quality, and is a new breakthrough of the heat 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 | Novel process for unconventional carbonitriding |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 91106863 CN1072966A (en) | 1991-12-03 | 1991-12-03 | Novel process for unconventional carbonitriding |
Publications (1)
Publication Number | Publication Date |
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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 | Novel process for unconventional carbonitriding |
Country Status (1)
Country | Link |
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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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PB01 | Publication | ||
C01 | Deemed withdrawal of patent application (patent law 1993) | ||
WD01 | Invention patent application deemed withdrawn after publication |