CN103849736A - Heat treatment process of high-chromium cast iron - Google Patents
Heat treatment process of high-chromium cast iron Download PDFInfo
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- CN103849736A CN103849736A CN201210493178.5A CN201210493178A CN103849736A CN 103849736 A CN103849736 A CN 103849736A CN 201210493178 A CN201210493178 A CN 201210493178A CN 103849736 A CN103849736 A CN 103849736A
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- cast iron
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Abstract
The invention discloses a heat treatment process of high-chromium cast iron. The heat treatment process comprises the following steps: A, carrying out annealing treatment; B, carrying out quenching treatment; and C, carrying out tempering treatment. According to the heat treatment process of the high-chromium cast iron, the heat treatment is a necessary way for obtaining qualified high-chromium cast iron, so the reasonably set heat treatment process seems quite important.
Description
Technical field
The present invention relates to a kind of thermal treatment process of rich chromium cast iron.
Background technology
Thermal treatment is a method of improving metallic substance quality, can change or affect tissue and the character of cast iron by thermal treatment, also can obtain higher intensity, hardness and wear resistance etc. simultaneously, but, original rich chromium cast iron thermal treatment can not meet processing requirement, reaches the higher intensity of acquisition, hardness and wear resistance.
Summary of the invention
The object of this invention is to provide a kind of thermal treatment process of rich chromium cast iron.
The technical scheme that the present invention adopted is for achieving the above object: a kind of thermal treatment process of rich chromium cast iron, comprises the following steps:
A, anneal, need are processed to workpiece and under reviewing, pack heat treatment furnace into, then be slowly warming up to 400 ℃ of left and right with stove and be incubated l-2h, furnace temperature is risen to 600 ℃ subsequently and be incubated again 1-2h, afterwards to be no more than the temperature rise speed of 150 ℃/h, furnace temperature is risen to fast to the insulation of carrying out 2～3h after 950 ℃, then stop heating;
B, quench treatment, by the workpiece room temperature shove charge after mechanical workout, with the temperature rise speed that is less than 80 ℃/h, furnace temperature is risen to 600 ℃, be incubated to be no more than after furnace temperature is risen to quenching temperature 950-980 ℃ by the temperature rise speed of 150 ℃/h afterwards, soaking time is 2-4h, then workpiece quick tapping is carried out to air cooling;
C, carry out temper.
In described step C, temper is workpiece shove charge under room temperature state, then is warming up to 230-260 ℃, insulation 3-6h, the air cooling of coming out of the stove afterwards.
The thermal treatment process of a kind of rich chromium cast iron of the present invention, thermal treatment is the necessary means that obtains qualified high network cast iron, therefore formulates rational thermal treatment process and seems very important.
Embodiment
The thermal treatment process of rich chromium cast iron, comprise the following steps: A, anneal, need are processed to workpiece and under reviewing, pack heat treatment furnace into, then be slowly warming up to 400 ℃ of left and right with stove and be incubated l-2h, furnace temperature is risen to 600 ℃ subsequently and be incubated again 1-2h, to be no more than the temperature rise speed of 150 ℃/h, furnace temperature is risen to fast to the insulation of carrying out 2～3h after 950 ℃ afterwards, then stop heating, B, quench treatment, by the workpiece room temperature shove charge after mechanical workout, with the temperature rise speed that is less than 80 ℃/h, furnace temperature is risen to 600 ℃, be incubated to be no more than after furnace temperature is risen to quenching temperature 950-980 ℃ by the temperature rise speed of 150 ℃/h afterwards, soaking time is 2-4h, then workpiece quick tapping is carried out to air cooling, carry out temper, for reducing residual stress of casting and fragility, and keep its match to obtain, high rigidity and wear resistance, also make martensite be able to tempering simultaneously, and residual austenite reduces to some extent, workpiece after reply is quenched carries out the temper of 230-260 ℃ again, concrete technology is by workpiece shove charge under room temperature state, be warming up to again 230-260 ℃, insulation 3-6h, the air cooling of coming out of the stove afterwards, the thermal treatment process of a kind of rich chromium cast iron of the present invention, thermal treatment is the necessary means that obtains qualified high network cast iron, therefore formulate rational thermal treatment process and seem very important.
Claims (2)
1. a thermal treatment process for rich chromium cast iron, is characterized in that: comprise the following steps:
A, anneal, need are processed to workpiece and under reviewing, pack heat treatment furnace into, then be slowly warming up to 400 ℃ of left and right with stove and be incubated l-2h, furnace temperature is risen to 600 ℃ subsequently and be incubated again 1-2h, afterwards to be no more than the temperature rise speed of 150 ℃/h, furnace temperature is risen to fast to the insulation of carrying out 2～3h after 950 ℃, then stop heating;
B, quench treatment, by the workpiece room temperature shove charge after mechanical workout, with the temperature rise speed that is less than 80 ℃/h, furnace temperature is risen to 600 ℃, be incubated to be no more than after furnace temperature is risen to quenching temperature 950-980 ℃ by the temperature rise speed of 150 ℃/h afterwards, soaking time is 2-4h, then workpiece quick tapping is carried out to air cooling;
C, carry out temper.
2. the thermal treatment process of a kind of rich chromium cast iron according to claim 1, is characterized in that: in described step C, temper, by workpiece shove charge under room temperature state, then is warming up to 230-260 ℃, insulation 3-6h, the air cooling of coming out of the stove afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210493178.5A CN103849736A (en) | 2012-11-28 | 2012-11-28 | Heat treatment process of high-chromium cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210493178.5A CN103849736A (en) | 2012-11-28 | 2012-11-28 | Heat treatment process of high-chromium cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103849736A true CN103849736A (en) | 2014-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201210493178.5A Pending CN103849736A (en) | 2012-11-28 | 2012-11-28 | Heat treatment process of high-chromium cast iron |
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| CN (1) | CN103849736A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104195304A (en) * | 2014-07-25 | 2014-12-10 | 宁国市开源电力耐磨材料有限公司 | Thermal treatment method for ultrahigh chromium cast iron |
| CN107447083A (en) * | 2017-01-19 | 2017-12-08 | 天津万立鑫晟新材料技术研究院有限公司 | Application method of the PAG water-based hardening liquids in rich chromium cast iron heat treating castings |
| CN112813243A (en) * | 2021-01-07 | 2021-05-18 | 湖州中联机械制造有限公司 | Heat treatment process for large high-chromium iron casting impeller product in dredging industry |
-
2012
- 2012-11-28 CN CN201210493178.5A patent/CN103849736A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104195304A (en) * | 2014-07-25 | 2014-12-10 | 宁国市开源电力耐磨材料有限公司 | Thermal treatment method for ultrahigh chromium cast iron |
| CN107447083A (en) * | 2017-01-19 | 2017-12-08 | 天津万立鑫晟新材料技术研究院有限公司 | Application method of the PAG water-based hardening liquids in rich chromium cast iron heat treating castings |
| CN112813243A (en) * | 2021-01-07 | 2021-05-18 | 湖州中联机械制造有限公司 | Heat treatment process for large high-chromium iron casting impeller product in dredging industry |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140611 |