CN1693490A - Method of preventing decarbon of iron and steel parts during heat treatment in air medium - Google Patents
Method of preventing decarbon of iron and steel parts during heat treatment in air medium Download PDFInfo
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- CN1693490A CN1693490A CN 200510057078 CN200510057078A CN1693490A CN 1693490 A CN1693490 A CN 1693490A CN 200510057078 CN200510057078 CN 200510057078 CN 200510057078 A CN200510057078 A CN 200510057078A CN 1693490 A CN1693490 A CN 1693490A
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- boric acid
- decarburization
- thermal treatment
- iron
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Abstract
A method for preventing the iron or steel workpiece from being decarbonized during heat treatment in air medium includes such steps as immersing said workpiece in the alcohol solution of boric acid, stirring, drying in air, buring charcoal particles in the heating furnace for removing the oxidizing gas, and heat treating.
Description
Technical field
The invention belongs to the thermal treatment field, particularly a kind of method that prevents steel-iron components thermal treatment decarburization in air dielectric.
Background technology
Steel-iron components adopts usually during heating the saturating method of burning or dripping kerosene of charcoal grain is protected workpiece, to prevent workpiece decarburization in heat treatment process when traditional well-type electric furnace or cabinet-type electric furnace thermal treatment.Because well-type electric furnace or the cabinet-type electric furnace hot-treatment heating equipment is outmoded, fall behind; no controlled atmosphere control device; adopt charcoal grain when steel-iron components is heat-treated heating therein or drip the kerosene protection; and the steel-iron components of materials such as 30CrMnMoTiA, 30CrMnSiA, 25Cr2Ni4WA, 60Si2MnA, 65Si2MnWA is when heat-treating heating; although adopted the above-mentioned saturating method of burning or dripping kerosene of charcoal grain is protected workpiece; but still easily produce thermal treatment critical defects such as decarburization or carburizing, cause scrapping of property product in batches.
Summary of the invention
The objective of the invention is, a kind of method that prevents steel-iron components thermal treatment decarburization in air dielectric is provided.Utilize existing well-type electric furnace or cabinet-type electric furnace equipment that steel-iron components is heat-treated, before quenching, workpiece and heat treatment furnace are handled, made the workpiece after the quenching not have decarburization or not have cementation zone, can guarantee the surface hardness after workpiece quenches, and also have low, the simple to operate characteristics of cost.
The object of the present invention is achieved like this: before thermal treatment workpiece and process furnace are prevented the decarburization processing, may further comprise the steps:
A. workpiece is dipped in the boric acid spirit solution, stirs, taking-up is dried
Boric acid alcohol concentration is: add boric acid 100-500 gram in every liter of alcohol;
B. process furnace is removed the processing of oxidizing gas
Under quenching temperature, add charcoal grain, the saturating burning.
Charcoal grain is saturating the burning 5-20 minute under quenching temperature.
Charcoal grain add-on 〉=1.5Kg/30KW.
Advantage of the present invention is:
1, the workpiece that the present invention is used for, low temperature (≤900 ℃) thermal treatment is heated, therefore applied widely.
2, because workpiece carries out the boric acid alcohol immersion treatment before quenching; after taking-up is dried; make workpiece surface form the boric acid protective film; when advancing the stove heating; boric acid is fused solution and is attached to workpiece surface in heat-processed; stop iron, the carbon generation oxidizing reaction of airborne oxidizing gas and workpiece surface, thereby prevent the workpiece surface decarburization, the defective after the workpiece after therefore quenching does not have decarburization or do not have thermal treatment such as cementation zone.
3, operational safety of the present invention, simple, cost is low.
The present invention is described further below in conjunction with embodiment.
Embodiment
Embodiment 1
1. configuration boric acid solution
Get boric acid 100 gram, join in 1000 milliliters the alcohol, stirring and evenly mixing promptly obtains required boric acid spirit solution.
2. the workpiece that will need to quench (workpiece material is: 25Cr2Ni4WA) be immersed in the boric acid solution of configuration, in the solution of stirring and evenly mixing, soak more than 5 seconds, take out dry after, workpiece surface obtains thin uniformly boric acid rete.
3. before the first stove of workpiece quenched, the processing to process furnace is removed oxidizing gas added the process furnace that is in quenching temperature with charcoal grain, burns thoroughly 5-20 minute, to reduce the oxidizing atmosphere in the process furnace, avoids workpiece decarburization in heat treatment process.Its charcoal grain add-on 1.5Kg/30KW.Add once behind the every processing of the charcoal grain 1-5 stove.
Embodiment 2
1. configuration boric acid solution
Get boric acid 200 gram, join in 1000 milliliters the alcohol, stirring and evenly mixing promptly obtains required boric acid solution.
2. the workpiece (workpiece material is 30CrMnMoTiA) that will need to quench is immersed in the boric acid solution of configuration, soaks in the solution of stirring and evenly mixing more than 5 seconds, and after taking-up was dried, workpiece surface obtained thin uniformly boric acid rete.
3. before the first stove of workpiece quenched, the processing to process furnace is removed oxidizing gas added the process furnace that is in quenching temperature with charcoal grain, burns thoroughly 5-20 minute, to reduce the oxidizing atmosphere in the process furnace, avoids workpiece decarburization in heat treatment process.Its charcoal grain add-on 1.5Kg/30KW.Add once behind the every processing of the charcoal grain 1-5 stove.
Embodiment 3
1. configuration boric acid solution
Get boric acid 300 gram, join in 1000 milliliters the alcohol, stirring and evenly mixing promptly obtains required boric acid solution.
2. the workpiece (workpiece material is 30CrMnMoTiA) that will need to quench is immersed in the boric acid solution of configuration, soaks in the solution of stirring and evenly mixing more than 5 seconds, and after taking-up was dried, workpiece surface obtained thin uniformly boric acid rete.
3. before the first stove of workpiece quenched, the processing to process furnace is removed oxidizing gas added the process furnace that is in quenching temperature with charcoal grain, burns thoroughly 5-20 minute, to reduce the oxidizing atmosphere in the process furnace, avoids workpiece decarburization in heat treatment process.Charcoal grain add-on 1.5Kg/30KW.Add once behind the every processing of the charcoal grain 1-5 stove.
Embodiment 4
1. configuration boric acid solution
Get boric acid 500 gram, join in 1000 milliliters the alcohol, stirring and evenly mixing promptly obtains required boric acid solution.
2. the workpiece (workpiece material is 65Si2MnWA) that will need to quench is immersed in the boric acid solution of configuration, soaks in the solution of stirring and evenly mixing more than 5 seconds, and after taking-up was dried, workpiece surface obtained thin uniformly boric acid rete.
3. before the first stove of workpiece quenched, the processing to process furnace is removed oxidizing gas added the process furnace that is in quenching temperature with charcoal grain, burns thoroughly 5-20 minute, to reduce the oxidizing atmosphere in the quenching furnance, avoids workpiece decarburization in heat treatment process.Charcoal grain add-on 1.5Kg/30KW.Add once behind the every processing of the charcoal grain 1-5 stove.
Quench according to usual method adopting workpiece after the present invention handles to put in the above-mentioned process furnace, the workpiece after the quenching does not have Decarburized layer and cementation zone through physical and chemical inspection.
Boric acid of the present invention is chemical pure.Alcohol of the present invention is chemical pure or technical pure.The charcoal grain that the present invention adopts blue or green thick stick wood to fire is respond well.
Claims (3)
1. a method that prevents steel-iron components thermal treatment decarburization in air dielectric is characterized in that before thermal treatment workpiece and process furnace being prevented the decarburization processing, may further comprise the steps:
A. workpiece is dipped in the boric acid spirit solution, stirs, taking-up is dried
Boric acid alcohol concentration is: add boric acid 100-500 gram in every liter of alcohol;
B. process furnace is removed the processing of oxidizing gas
Under quenching temperature, add charcoal grain, the saturating burning.
2, the method that prevents steel-iron components thermal treatment decarburization in air dielectric according to claim 1 is characterized in that: charcoal grain is saturating the burning 5-20 minute under quenching temperature.
3, the method that prevents steel-iron components thermal treatment decarburization in air dielectric according to claim 1 is characterized in that: charcoal grain add-on 〉=1.5Kg/30KW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510057078 CN1693490A (en) | 2005-05-23 | 2005-05-23 | Method of preventing decarbon of iron and steel parts during heat treatment in air medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510057078 CN1693490A (en) | 2005-05-23 | 2005-05-23 | Method of preventing decarbon of iron and steel parts during heat treatment in air medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1693490A true CN1693490A (en) | 2005-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 200510057078 Pending CN1693490A (en) | 2005-05-23 | 2005-05-23 | Method of preventing decarbon of iron and steel parts during heat treatment in air medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194588A (en) * | 2013-01-07 | 2013-07-10 | 浙江吉利汽车研究院有限公司杭州分公司 | Heat treatment process for 65Mn spring washer |
| CN108285955A (en) * | 2018-03-06 | 2018-07-17 | 常州天山重工机械有限公司 | A kind of method that sample is annealed before 18CrNiMo7-6 carburizers |
-
2005
- 2005-05-23 CN CN 200510057078 patent/CN1693490A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194588A (en) * | 2013-01-07 | 2013-07-10 | 浙江吉利汽车研究院有限公司杭州分公司 | Heat treatment process for 65Mn spring washer |
| CN103194588B (en) * | 2013-01-07 | 2015-03-25 | 浙江吉利汽车研究院有限公司杭州分公司 | Heat treatment process for 65Mn spring washer |
| CN108285955A (en) * | 2018-03-06 | 2018-07-17 | 常州天山重工机械有限公司 | A kind of method that sample is annealed before 18CrNiMo7-6 carburizers |
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Owner name: JIANSHE MOTORCYCLE CO., LTD., CHONGQING Free format text: FORMER OWNER: CONSTRUCTION INDUSTRY (GROUP) CO., LTD. Effective date: 20060106 |
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Effective date of registration: 20060106 Address after: Zheng Jie 400050 Xiejiawan Jiulongpo District of Chongqing City No. 47 Applicant after: Chongqing Jianshe Motorcycle Co., Ltd. Address before: Zheng Jie 400050 Xiejiawan Jiulongpo District of Chongqing City No. 47 Applicant before: Construction Industry (Group) Co., Ltd. |
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