CN105779709A - Quenching and tempering technology for 5CrNiMo - Google Patents
Quenching and tempering technology for 5CrNiMo Download PDFInfo
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- CN105779709A CN105779709A CN201410761385.3A CN201410761385A CN105779709A CN 105779709 A CN105779709 A CN 105779709A CN 201410761385 A CN201410761385 A CN 201410761385A CN 105779709 A CN105779709 A CN 105779709A
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Abstract
The invention discloses a quenching and tempering technology for 5CrNiMo. The quenching and tempering technology comprises the following processes that the preheating temperature is 600 DEG C-650 DEG C and does not exceed a phase transformation line, and the preheating time is 4 hours; specifically, 1, the quenching heating temperature is determined, specifically, the quenching temperature of the 5CrNiMo is 830 DEG C-860 DEG C, and after the quenching temperature rises, generation of thermal fatigue cracks can be delayed; but if the quenching temperature is higher than 900 DEG C, the heating quenching impact toughness begins to decrease, the heating speed is high, the workpiece temperature difference is large, insufficient heating is prone to occurrence, and therefore the heating temperature can be high; T=Ac3+50 DEG C-80 DEG C, and Ac3=780 DEG C; T=Ac3+50 DEG C-80 DEG C=830 DEG C-860 DEG C; and the quenching temperature of the 5CrNiMo is 840 DEG C-860 DEG C; 2, the quenching heat preservation time is determined, specifically, t=akD (a medium-temperature box-type resistance furnace is adopted, a=1.2-1.6, k=1, and D=300 mm); and t=1.2*1*300=6 h; 3, the quenching cooling mode is determined, specifically, oil cooling is adopted, usually when cooled to 150 DEG C-200 DEG C, a hammer forging die should be taken out of an oil tank, and then tempering is conducted immediately; and 4, the quenching hardness is measured, and the hardness is appropriate when being in the range of 53-59 HRC. According to the quenching and tempering technology for the 5CrNiMo, operation is easy, and the experience requirement of an operator is low.
Description
Technical field
The present invention relates to a kind of 5CrNiMo hardening and tempering process.
Background technology
The adjustment in processing step and device parameter etc. of the existing 5CrNiMo hardening and tempering process there is also certain empirical and technical, for the operator newly started with, also need to carry out substantial amounts of exercise and could grasp operation skill, produce the good product of quality.
Summary of the invention
In order to realize the purpose of the present invention, the present invention provides the 5CrNiMo hardening and tempering process of a kind of easy to operate, quick, easy left-hand seat.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that
A kind of 5CrNiMo hardening and tempering process, including following operation:
Preheating temperature is 600 DEG C～650 DEG C, does not exceed phase change line, and preheating time is 4 hours；
1. the determination of quenching temperature
5CrNiMo hardening heat is 830 DEG C～860 DEG C, and hardening heat can postpone the generation of heat fatigue cracking after raising, but beginning to decline more than 900 DEG C of heating quenching impact toughnesses, firing rate is big, and part temperature difference is big, underheat easily occurs, so heating-up temperature is desirable big；
T=Ac3+50 DEG C～80 DEG C；
Ac3=780℃；
T=Ac3+50 DEG C～80 DEG C=830 DEG C～860 DEG C；
5CrNiMo hardening heat is 840 DEG C～860 DEG C；
2. the determination of Quenching Soaking Time
Temperature type resistance furnace a=1.2～1.6 in t=akD(employing, k=1, D=300mm)；
t=1.2×1×300=6h；
3. quench the type of cooling
With oil cooling, general hammer forging die is when being as cold as 150 DEG C～200 DEG C, after should taking out from oil groove, and tempering immediately；
4. quenching hardness measures
Hardness is within the scope of 53～59HRC, properly.
The present invention is simple to operate, and operator's skill requirement is low, and product quality is high.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
A kind of 5CrNiMo hardening and tempering process, including following operation:
Preheating before hammer forging die quenching, because hammer forging die workpiece size is relatively big, inside and outside the temperature difference is relatively big, and adds the reduction of alloying element thermal conductivity, in order to prevent workpiece from ftractureing, it is necessary to preheat；Preheating temperature is 600 DEG C～650 DEG C, does not exceed phase change line, and preheating time is 4 hours；
1. the determination of quenching temperature
5CrNiMo hardening heat is 830 DEG C～860 DEG C, and hardening heat can postpone the generation of heat fatigue cracking after raising, but beginning to decline more than 900 DEG C of heating quenching impact toughnesses, firing rate is big, and part temperature difference is big, underheat easily occurs, so heating-up temperature is desirable big；
T=Ac3+50 DEG C～80 DEG C；
Ac3=780℃；
T=Ac3+50 DEG C～80 DEG C=830 DEG C～860 DEG C；
5CrNiMo hardening heat is 840 DEG C～860 DEG C；
2. the determination of Quenching Soaking Time
Temperature type resistance furnace a=1.2～1.6 in t=akD(employing, k=1, D=300mm)
t=1.2×1×300=6h
3. quench the type of cooling
With oil cooling, general hammer forging die is when being as cold as 150 DEG C～200 DEG C, after should taking out from oil groove, and tempering immediately；
4. quenching hardness measures
Hardness is within the scope of 53～59HRC, properly.
Claims (1)
1. a 5CrNiMo hardening and tempering process, is characterized in that: include following operation:
Preheating temperature is 600 DEG C～650 DEG C, does not exceed phase change line, and preheating time is 4 hours；
1. the determination of quenching temperature
5CrNiMo hardening heat is 830 DEG C～860 DEG C, and hardening heat can postpone the generation of heat fatigue cracking after raising, but beginning to decline more than 900 DEG C of heating quenching impact toughnesses, firing rate is big, and part temperature difference is big, underheat easily occurs, so heating-up temperature is desirable big；
T=Ac3+50 DEG C～80 DEG C；
Ac3=780℃；
T=Ac3+50 DEG C～80 DEG C=830 DEG C～860 DEG C；
5CrNiMo hardening heat is 840 DEG C～860 DEG C；
2. the determination of Quenching Soaking Time
Temperature type resistance furnace a=1.2～1.6 in t=akD(employing, k=1, D=300mm)；
t=1.2×1×300=6h；
3. quench the type of cooling
With oil cooling, general hammer forging die is when being as cold as 150 DEG C～200 DEG C, after should taking out from oil groove, and tempering immediately；
4. quenching hardness measures
Hardness is within the scope of 53～59HRC, properly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410761385.3A CN105779709A (en) | 2014-12-13 | 2014-12-13 | Quenching and tempering technology for 5CrNiMo |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410761385.3A CN105779709A (en) | 2014-12-13 | 2014-12-13 | Quenching and tempering technology for 5CrNiMo |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105779709A true CN105779709A (en) | 2016-07-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410761385.3A Pending CN105779709A (en) | 2014-12-13 | 2014-12-13 | Quenching and tempering technology for 5CrNiMo |
Country Status (1)
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| CN (1) | CN105779709A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108085474A (en) * | 2017-12-06 | 2018-05-29 | 宁夏天地奔牛实业集团有限公司 | The heat treatment method of water air quenching fire during the segmentation control of mining scraper hammer forging die |
-
2014
- 2014-12-13 CN CN201410761385.3A patent/CN105779709A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108085474A (en) * | 2017-12-06 | 2018-05-29 | 宁夏天地奔牛实业集团有限公司 | The heat treatment method of water air quenching fire during the segmentation control of mining scraper hammer forging die |
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Application publication date: 20160720 |
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| WD01 | Invention patent application deemed withdrawn after publication |