CN1054622A - The agent of nitrogen group protecting atmosphere system gas - Google Patents
The agent of nitrogen group protecting atmosphere system gas Download PDFInfo
- Publication number
- CN1054622A CN1054622A CN 91102571 CN91102571A CN1054622A CN 1054622 A CN1054622 A CN 1054622A CN 91102571 CN91102571 CN 91102571 CN 91102571 A CN91102571 A CN 91102571A CN 1054622 A CN1054622 A CN 1054622A
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- CN
- China
- Prior art keywords
- nitrogen
- atmosphere
- group protecting
- agent
- system gas
- 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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Abstract
The present invention is relevant with metal heat treatmet.The agent of nitrogen group protecting atmosphere system gas be at normal temperatures white solid, nontoxic, be insoluble in water.Its chemical ingredients and shared weight percent thereof are respectively: nitrogen 62.67-65.50%, carbon 30.64-35.83%, hydrogen 1.50-3.86%.The agent of nitrogen group protecting atmosphere system gas can form N during use
2+ CO+H
2And N
2+ CO+NH
3Etc. atmosphere, both can be used for the low or non oxidizing heating of metal, can be used for the atmosphere of nitrogen-based soft-nitride of steel again.With existing nitrogen-based atmosphere heat treatment phase relatively.The present invention is without any need for the air feeder of independent nitrogen group protecting atmosphere, and production operation is easy, and the energy and industrial chemicals consumption are few, and production cost is low.
Description
The present invention is relevant with metal heat treatmet.
Metal is heat-treated heating in controlled atmosphere, not only can avoid oxidization burning loss, save metallic substance, obtain bright and clean or bright surface, and can avoid decarburization fully, reach the mechanical property that improves metallic substance, prolong the machine parts purpose in work-ing life.Nitrogen-based atmosphere protection thermal treatment is to be matrix with nitrogen and to add a kind of controlled atmosphere thermal treatment that an amount of additive is prepared into.
Nitrogen is neutral gas, and chemical property is stable, and itself does not have reducing power.More or less contain O in the industrial nitrogen
2Impurity, heat treatment furnace are also easily invaded the air of burner hearth and air and the moisture that workpiece is brought into and are polluted, thereby single industrial nitrogen is not the ideal protective atmosphere.Chemical thermodynamics points out that desire realizes nonoxidizing heating, requires the furnace gas oxygen partial pressure to be lower than the metal oxide decomposition pressure.Production practice show that for realizing bright heat treatment, it is 0.001% that the furnace gas oxygen level should be lower than 10ppm().So practical nitrogen group protecting atmosphere should contain a small amount of reducing gas, as CO, H
2Deng.
The nitrogen base atmosp-here heat treatment key equipment is the airing system of nitrogen-based atmosphere, no matter nitrogen preparation at present is to adopt cryogenic air separation method or the empty point-score of molecular sieve, all there are problems such as facility investment is big, production cost height, and the various additives that can supply nitrogen-based atmosphere thermal treatment to select for use, as liquefied ammonia, methane, kerosene, methyl alcohol, ethanol, trolamine, methane amide etc., all there is such-and-such problem, or inflammable and explosive or toxic effect or produce carbon black and be difficult for cracking or not enough economic dispatch.
The present invention proposes the agent of a kind of nitrogen group protecting atmosphere system gas, and its purpose is to overcome above-mentioned shortcoming.
The new nitrogen group protecting atmosphere system gas agent that proposes is white solid at normal temperatures, and is nontoxic, be insoluble in water.It is characterized in that chemical ingredients and shared weight percent thereof are respectively: nitrogen 62.67-65.50%, carbon 30.64-35.83%, hydrogen 1.50-3.86%
The nitrogen group protecting atmosphere system gas agent that the present invention proposes, its use is extremely easy.The agent of nitrogen group protecting atmosphere system gas is directly thrown in the stove, under differing temps, can form dissimilar nitrogen base heat-treating atmospheres.In 500-700 ℃ of scope, mainly form N
2+ CO+NH
3Nitrogen base tufftride atmosphere; In temperature more than 700 ℃, mainly form N
2+ CO+H
2Nitrogen group protecting atmosphere.Therefore, the agent of nitrogen group protecting atmosphere system gas both can be used for the low or non oxidizing heating of metal, can be used for the atmosphere of nitrogen-based soft-nitride of steel again.
The nitrogen group protecting atmosphere system gas agent that the present invention proposes almost can be used for existing various Equipment for Heating Processing, as the annular or the through heat treatment furnace of trolley type annealing furnace, box-type furnace, bell furnace, pit furnace, rotary retort type electric resistance furnace and good seal.
With existing nitrogen-based atmosphere heat treatment phase relatively, the present invention is without any need for the air feeder of independent nitrogen group protecting atmosphere, and production operation is easy, and the energy and industrial chemicals consumption are few, and production cost is low.
Claims (3)
1, a kind of nitrogen group protecting atmosphere system gas agent is characterized in that chemical ingredients and shared weight percent thereof are respectively: nitrogen 62.67-65.50%, carbon 30.64-35.83%, hydrogen 1.50-3.86%.
2,, can be used for the low or non oxidizing heating of metal according to the agent of the described nitrogen group protecting atmosphere system gas of claim 1.
3,, can be used for the atmosphere of nitrogen-based soft-nitride of steel according to the agent of the described nitrogen group protecting atmosphere system gas of claim 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90101258 CN1024691C (en) | 1990-03-13 | 1990-03-13 | Low-alloy steel to resist dew point corrosion of sulphuric acid |
| CN 91102571 CN1054622A (en) | 1991-04-24 | 1991-04-24 | The agent of nitrogen group protecting atmosphere system gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102571 CN1054622A (en) | 1991-04-24 | 1991-04-24 | The agent of nitrogen group protecting atmosphere system gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1054622A true CN1054622A (en) | 1991-09-18 |
Family
ID=4905660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91102571 Pending CN1054622A (en) | 1990-03-13 | 1991-04-24 | The agent of nitrogen group protecting atmosphere system gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1054622A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100422378C (en) * | 2002-06-28 | 2008-10-01 | Sms迪马格股份公司 | Use of separation gas in continuous hot dip metal finishing |
| CN101928817A (en) * | 2010-08-27 | 2010-12-29 | 上海心田电工设备有限公司 | Method for preparing protective gas for heat treatment of metals |
-
1991
- 1991-04-24 CN CN 91102571 patent/CN1054622A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100422378C (en) * | 2002-06-28 | 2008-10-01 | Sms迪马格股份公司 | Use of separation gas in continuous hot dip metal finishing |
| CN101928817A (en) * | 2010-08-27 | 2010-12-29 | 上海心田电工设备有限公司 | Method for preparing protective gas for heat treatment of metals |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |