CN105648174A - Tempering technology of 40Cr steel - Google Patents
Tempering technology of 40Cr steel Download PDFInfo
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- CN105648174A CN105648174A CN201410727581.9A CN201410727581A CN105648174A CN 105648174 A CN105648174 A CN 105648174A CN 201410727581 A CN201410727581 A CN 201410727581A CN 105648174 A CN105648174 A CN 105648174A
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Abstract
The invention discloses a tempering technology of 40Cr steel. The tempering technology comprises the following technical steps that: 1) 40Cr workpieces are oil-cooled after being hardened, the hardenability of 40Cr steel is great, the 40Cr workpieces can be hardened after being cooled in oil, and the deformation and cracking inclination of the workpieces is small; 2), after the 40Cr workpieces are tempered, the hardness is still slightly high, and the second tempering temperature is raised by 20-50DEG C; and 3), after high-temperature tempering is carried out on the 40Cr workpieces, the 40Cr workpieces in complicated shapes are cooled in oil, and simple workpieces are cooled in water; and if necessary, stress relief treatment is carried out on workpieces tempered and rapidly cooled. All parameters are reasonably and harmonically matched, and the production efficiency can be effectively improved.
Description
Technical field
The present invention relates to the hardening and tempering process of a kind of 40Cr steel.
Background technology
The hardening and tempering process of existing 40Cr steel exists that procedure arrangement is unreasonable, operation is various, and processing parameter is selected unreasonable, and the collocation of each processing parameter is unreasonable, and requires higher to operator's experience so that production cost is higher, quality product is on the low side, yield rate is not high.
Summary of the invention
Because the above-mentioned defect of prior art, technical problem to be solved by this invention be to provide a kind of operation rationally, the hardening and tempering process of the 40Cr steel of low cost of manufacture.
For achieving the above object, the present invention provides
A hardening and tempering process for 40Cr steel, comprises the steps:
1) processing step:
(1) adopting oil cold after 40Cr workpiece quenching, the hardening capacity of 40Cr steel is better, cools and can harden in oil, and the distortion of workpiece, tearing tendency are little;
(2) the modified rear hardness of 40Cr workpiece is still higher, and second time tempering temperature will increase by 20 ~ 50 DEG C;
(3), after 40Cr workpiece high tempering, complex-shaped cools in oil, simply cools in water; Workpiece after tempered fast cooling, imposes the process that eliminates stress if desired again;
2) precaution:
(1) workpiece transfers to cooling tank speed slowly from process furnace, and the temperature that workpiece enters water has dropped to lower than Ar3 stagnation point, and generating portion is decomposed, and workpiece obtains slack quenching tissue, does not reach hardness requirement; So finding cooling fluid to be particular about speed, big workpiece gives the cold GPRS time;
(2) workpiece batch is wanted rationally to be advisable with 1 ~ 2 layer, and workpiece is overlapped causes heating uneven, causes hardness not even;
(3) workpiece enters water arrangement and should keep certain distance, cross secret emissary's workpiece nearby vapor film break and be obstructed, cause workpiece on the low side close to surface hardness;
(4) blow-on quenching, can not quench without a break, should look furnace temperature decline degree, and midway is closed stove and again heated up, so that hardness is consistent after front and back workpiece is quenched;
(5) it is noted that the temperature of cooling fluid, the temperature of 10% salt solution is not as higher than 60 DEG C, used; Cooling fluid can not have the impurity such as greasy dirt, mud, not so, there will be hardness deficiency or non-uniform phenomenon;
(6) modified without machining blanks, hardness can not be even, and such as the modified quality to have been obtained, blank should be rough turn, and bar to be forged;
(7) lower hardness 1 ~ 3 unit after quenching, it is possible to adjustment tempering temperature reaches hardness requirement; But workpiece hardness is too low after quenching, even only HRC25 ~ 35 having, it is necessary to again quench.
The invention has the beneficial effects as follows: operation of the present invention is reasonable, low cost of manufacture, each parameter collocation reasonable coordination, it is possible to effectively improve product quality and production efficiency.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
A hardening and tempering process for 40Cr steel, comprises the steps:
1) processing step:
(1) adopting oil cold after 40Cr workpiece quenching, the hardening capacity of 40Cr steel is better, cools and can harden in oil, and the distortion of workpiece, tearing tendency are little;
(2) the modified rear hardness of 40Cr workpiece is still higher, and second time tempering temperature will increase by 20 ~ 50 DEG C;
(3), after 40Cr workpiece high tempering, complex-shaped cools in oil, simply cools in water; Workpiece after tempered fast cooling, imposes the process that eliminates stress if desired again;
2) precaution:
(1) workpiece transfers to cooling tank speed slowly from process furnace, and the temperature that workpiece enters water has dropped to lower than Ar3 stagnation point, and generating portion is decomposed, and workpiece obtains slack quenching tissue, does not reach hardness requirement; So finding cooling fluid to be particular about speed, big workpiece gives the cold GPRS time;
(2) workpiece batch is wanted rationally to be advisable with 1 ~ 2 layer, and workpiece is overlapped causes heating uneven, causes hardness not even;
(3) workpiece enters water arrangement and should keep certain distance, cross secret emissary's workpiece nearby vapor film break and be obstructed, cause workpiece on the low side close to surface hardness;
(4) blow-on quenching, can not quench without a break, should look furnace temperature decline degree, and midway is closed stove and again heated up, so that hardness is consistent after front and back workpiece is quenched;
(5) it is noted that the temperature of cooling fluid, the temperature of 10% salt solution is not as higher than 60 DEG C, used; Cooling fluid can not have the impurity such as greasy dirt, mud, not so, there will be hardness deficiency or non-uniform phenomenon;
(6) modified without machining blanks, hardness can not be even, and such as the modified quality to have been obtained, blank should be rough turn, and bar to be forged;
(7) lower hardness 1 ~ 3 unit after quenching, it is possible to adjustment tempering temperature reaches hardness requirement; But workpiece hardness is too low after quenching, even only HRC25 ~ 35 having, it is necessary to again quench.
Claims (1)
1. a hardening and tempering process for 40Cr steel, is characterized in that: comprise the steps:
1) processing step:
(1) adopting oil cold after 40Cr workpiece quenching, the hardening capacity of 40Cr steel is better, cools and can harden in oil, and the distortion of workpiece, tearing tendency are little;
(2) the modified rear hardness of 40Cr workpiece is still higher, and second time tempering temperature will increase by 20 ~ 50 DEG C;
(3), after 40Cr workpiece high tempering, complex-shaped cools in oil, simply cools in water; Workpiece after tempered fast cooling, imposes the process that eliminates stress if desired again;
2) precaution:
(1) workpiece transfers to cooling tank speed slowly from process furnace, and the temperature that workpiece enters water has dropped to lower than Ar3 stagnation point, and generating portion is decomposed, and workpiece obtains slack quenching tissue, does not reach hardness requirement; So finding cooling fluid to be particular about speed, big workpiece gives the cold GPRS time;
(2) workpiece batch is wanted rationally to be advisable with 1 ~ 2 layer, and workpiece is overlapped causes heating uneven, causes hardness not even;
(3) workpiece enters water arrangement and should keep certain distance, cross secret emissary's workpiece nearby vapor film break and be obstructed, cause workpiece on the low side close to surface hardness;
(4) blow-on quenching, can not quench without a break, should look furnace temperature decline degree, and midway is closed stove and again heated up, so that hardness is consistent after front and back workpiece is quenched;
(5) it is noted that the temperature of cooling fluid, the temperature of 10% salt solution is not as higher than 60 DEG C, used;Cooling fluid can not have the impurity such as greasy dirt, mud, not so, there will be hardness deficiency or non-uniform phenomenon;
(6) modified without machining blanks, hardness can not be even, and such as the modified quality to have been obtained, blank should be rough turn, and bar to be forged;
(7) lower hardness 1 ~ 3 unit after quenching, it is possible to adjustment tempering temperature reaches hardness requirement; But workpiece hardness is too low after quenching, even only HRC25 ~ 35 having, it is necessary to again quench.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410727581.9A CN105648174A (en) | 2014-12-05 | 2014-12-05 | Tempering technology of 40Cr steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410727581.9A CN105648174A (en) | 2014-12-05 | 2014-12-05 | Tempering technology of 40Cr steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105648174A true CN105648174A (en) | 2016-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410727581.9A Pending CN105648174A (en) | 2014-12-05 | 2014-12-05 | Tempering technology of 40Cr steel |
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| CN (1) | CN105648174A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113817898A (en) * | 2021-07-12 | 2021-12-21 | 承德建龙特殊钢有限公司 | Method for improving structure performance of chromium-molybdenum steel |
-
2014
- 2014-12-05 CN CN201410727581.9A patent/CN105648174A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113817898A (en) * | 2021-07-12 | 2021-12-21 | 承德建龙特殊钢有限公司 | Method for improving structure performance of chromium-molybdenum steel |
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Application publication date: 20160608 |