CN102560021A - Heat treatment method for 40Cr wearing plate - Google Patents
Heat treatment method for 40Cr wearing plate Download PDFInfo
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- CN102560021A CN102560021A CN2012100362982A CN201210036298A CN102560021A CN 102560021 A CN102560021 A CN 102560021A CN 2012100362982 A CN2012100362982 A CN 2012100362982A CN 201210036298 A CN201210036298 A CN 201210036298A CN 102560021 A CN102560021 A CN 102560021A
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- wearing plate
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Abstract
The invention provides a heat treatment method for a 40Cr wearing plate. The method comprises the following steps of: 1, heating the wearing plate to the temperature of between 830 and 860DEG C; 2, precooling the heated wearing plate to the temperature of between 780 and 810DEG C in the air; 3, quenching the pre-cooled wearing plate in an inorganic quenching agent, and cooling to the temperature of between 190 and 210DEG C in oil; and 4, tempering the quenched wearing plate in a tempering furnace at the temperature of between 240 and 280DEG C. The heat treatment method is applied to mass production of wearing plates, a process is stable, waste products caused by cracking or distortion are avoided, and a productivity effect is improved; and by the heat treatment method, the heat treatment process allowance of workpieces can be controlled in a reasonable range, the subsequent machining difficulty is reduced and energy consumption is reduced.
Description
Technical field
The present invention relates to a kind of heat treating method, relate in particular to a kind of 40Cr wearing plate heat treating method.
Background technology
At present, the wearing plate in the bogie of rolling stock is the vitals of bogie, and wearing plate adopts 40Cr to process usually; The 40Cr wearing plate adopts oil or water to carry out quench treatment usually, adopts oil quenching, and hardness is detected about HRC35 in the back of quenching; Be out of shape for a short time, but quenching hardness is not enough; Employing water quenching and oil-cooling double quenching, hardness is detected about HRC50 in the back of quenching, but distorsion during quenching is big, follow-up ground finish difficulty, and there is cracking phenomena in the through hole, the scrap rate height.Therefore, the quenching of 40Cr wearing plate is second-rate in the prior art.
Summary of the invention
Technical problem to be solved by this invention is: a kind of 40Cr wearing plate heat treating method is provided; Solve the not enough and big difficulty of distorsion during quenching of 40Cr wearing plate quenching hardness in the prior art, be implemented in and reduce distorsion during quenching when guaranteeing the part high firmness to greatest extent.
The present invention provides a kind of 40Cr wearing plate heat treating method, comprising:
Step 1, wearing plate is heated in 830 degrees centigrade～860 degrees centigrade the TR;
Step 2, the wearing plate after the heating is carried out in the TR of air precooling to 780 degree centigrade～810 degrees centigrade;
Wearing plate after step 3, the precooling quenches at inorganic quenching medium, is cooled in the oil in 190 degrees centigrade～210 degrees centigrade the TR;
Step 4, the wearing plate after will quenching are put into tempering stove and are carried out tempering, and the TR in the tempering stove is 240 degrees centigrade～280 degrees centigrade.
40Cr wearing plate heat treating method provided by the invention; Be applied to the batch process of wearing plate, process stabilizing does not exist because of the waste product that ftractures or distortion causes; Improved productivity effect; And this thermal treatment process can make the thermal treatment process allowance of workpiece control in the reasonable scope, has reduced the difficulty of follow-up mechanical workout, has reduced energy consumption.
Aforesaid 40Cr wearing plate heat treating method, step 1 is specially: wearing plate is heated in 830 degrees centigrade～860 degrees centigrade the TR, is incubated 30 minutes～40 minutes, the soaking time coefficient is calculating in 1.2～1.5 minutes/millimeter.
Aforesaid 40Cr wearing plate heat treating method; Step 3 is specially: adopt the inorganic quenching medium of the NK-2 of 6%-7% to quench as the wearing plate of quenchant after to precooling; Wearing plate stopped in inorganic quenching medium 8 seconds～10 seconds; The residence time calculated by 2 seconds/millimeter～3 seconds/millimeter, during hardening step, wearing plate was moved up and down at inorganic quenching medium vertical centering control; Then, rapidly wearing plate is put in the TR that is cooled to 190 degrees centigrade～210 degrees centigrade in the oil.
Aforesaid 40Cr wearing plate heat treating method, step 4 is specially: the wearing plate after will quenching is put into tempering stove and is carried out tempering, and the TR in the tempering stove is 240 degrees centigrade～280 degrees centigrade, and heat treatment time is 1.2 hours～2 hours; Then, wearing plate is taken out air cooling from tempering stove.
Embodiment
Present embodiment 40Cr wearing plate heat treating method comprises:
Step 1, wearing plate is heated in 830 degrees centigrade～860 degrees centigrade the TR.Concrete; Chemical ingredients according to the 40Cr wearing plate; With reference to the carbon iron balance phasor, the critical temperature of 40Cr austenitizing is 782 degrees centigrade～810 degrees centigrade when confirming heating continuously, and quenching temperature then adopts 830 degrees centigrade～860 degrees centigrade; For reducing distortion and oxidation, present embodiment 40Cr wearing plate heat treating method adopts 830 degrees centigrade of quenching temperatures.Preferably, present embodiment 40Cr wearing plate heat treating method step 1 is heated to 830 degrees centigrade of insulations 30 minutes～40 minutes at wearing plate, and the soaking time coefficient is 1.2 minutes/millimeter～1.5 minutes/millimeter.
Step 2, the wearing plate after the heating is carried out in the TR of air precooling to 780 degree centigrade～810 degrees centigrade.
Step 3, the wearing plate after adopting inorganic quenching medium, oily double quenching mode to precooling quench in the TR that is chilled to 190 degrees centigrade～210 degrees centigrade.Concrete; Step 3 can adopt the inorganic quenching medium of the NK-2 of 6%-7% to quench as the wearing plate of quenchant after to precooling; Wearing plate stopped in inorganic quenching medium 8 seconds～10 seconds; The residence time calculated by 2 seconds/millimeter～3 seconds/millimeter, during hardening step, wearing plate was moved up and down at inorganic quenching medium vertical centering control; Then, rapidly wearing plate is put in the TR that is cooled to 190 degrees centigrade～210 degrees centigrade in the oil.Wearing plate goes out to put into oil rapidly behind the quenching medium and cool off, and avoids transport velocity to cross slow workpiece and returns thermal conductance to cause the quenching hardness of wearing plate not enough.
Step 4, the wearing plate after will quenching are put into tempering stove and are carried out tempering, and the TR in the tempering stove is 240 degrees centigrade～280 degrees centigrade.Concrete, the wearing plate after step 4 will be quenched is put into tempering stove and is carried out temper, and the TR in the tempering stove is 240 degrees centigrade～280 degrees centigrade, and soaking time is 1.2 hours～2 hours; Then, wearing plate is taken out air cooling from tempering stove.
Present embodiment 40Cr wearing plate heat treating method; Be applied to the batch process of wearing plate, process stabilizing does not exist because of the waste product that ftractures or distortion causes; Improved productivity effect; And this thermal treatment process can make the thermal treatment process allowance of workpiece control in the reasonable scope, has reduced the difficulty of follow-up mechanical workout, has reduced energy consumption.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (4)
1. a 40Cr wearing plate heat treating method is characterized in that, comprising:
Step 1, wearing plate is heated in 830 degrees centigrade～860 degrees centigrade the TR;
Step 2, the wearing plate after the heating is carried out in the TR of air precooling to 780 degree centigrade～810 degrees centigrade;
Wearing plate after step 3, the precooling quenches at inorganic quenching medium, is cooled in the oil in 190 degrees centigrade～210 degrees centigrade the TR;
Step 4, the wearing plate after will quenching are put into tempering stove and are carried out tempering, and the TR in the tempering stove is 240 degrees centigrade～280 degrees centigrade.
2. 40Cr wearing plate heat treating method according to claim 1; It is characterized in that; Step 1 is specially: wearing plate is heated in 830 degrees centigrade～860 degrees centigrade the TR, is incubated 30 minutes～40 minutes, the soaking time coefficient is 1.2 minutes/millimeter～1.5 minutes/millimeter.
3. 40Cr wearing plate heat treating method according to claim 1; It is characterized in that; Step 3 is specially: adopt the inorganic quenching medium of the NK-2 of 6%-7% to quench as the wearing plate of quenchant after to precooling, wearing plate stopped in inorganic quenching medium 8 seconds～10 seconds, and the residence time calculated by 2 seconds/millimeter～3 seconds/millimeter; During hardening step, wearing plate is moved up and down at inorganic quenching medium vertical centering control; Then, rapidly wearing plate is put in the TR that is cooled to 190 degrees centigrade～210 degrees centigrade in the oil.
4. 40Cr wearing plate heat treating method according to claim 1; It is characterized in that; Step 4 is specially: the wearing plate after will quenching is put into tempering stove and is carried out tempering, and the TR in the tempering stove is 240 degrees centigrade～280 degrees centigrade, and heat treatment time is 1.2 hours～2 hours; Then, wearing plate is taken out air cooling from tempering stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100362982A CN102560021A (en) | 2012-02-17 | 2012-02-17 | Heat treatment method for 40Cr wearing plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100362982A CN102560021A (en) | 2012-02-17 | 2012-02-17 | Heat treatment method for 40Cr wearing plate |
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| CN102560021A true CN102560021A (en) | 2012-07-11 |
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| CN2012100362982A Pending CN102560021A (en) | 2012-02-17 | 2012-02-17 | Heat treatment method for 40Cr wearing plate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106493518A (en) * | 2016-11-02 | 2017-03-15 | 常州泉汇重工科技有限公司 | Steel alloy circle quenching roller production technology used by galvanized wire |
| CN108313087A (en) * | 2017-12-13 | 2018-07-24 | 浙江大学 | A kind of vortex rail braking system wearing plate and its manufacturing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1160770A (en) * | 1996-03-28 | 1997-10-01 | 刘机 | Steel ball making process |
| CN101264507A (en) * | 2008-05-08 | 2008-09-17 | 刘机 | Steel-forged ball processing technique |
| CN101392314A (en) * | 2007-09-20 | 2009-03-25 | 吴江市天地人真空炉业有限公司 | Heat treating process of low alloy steel trolley sawtooth casting |
| CN101805824A (en) * | 2010-03-23 | 2010-08-18 | 中信重工机械股份有限公司 | Interrupted quenching thermal treatment method of 42CrMo4 roller shaft |
-
2012
- 2012-02-17 CN CN2012100362982A patent/CN102560021A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1160770A (en) * | 1996-03-28 | 1997-10-01 | 刘机 | Steel ball making process |
| CN101392314A (en) * | 2007-09-20 | 2009-03-25 | 吴江市天地人真空炉业有限公司 | Heat treating process of low alloy steel trolley sawtooth casting |
| CN101264507A (en) * | 2008-05-08 | 2008-09-17 | 刘机 | Steel-forged ball processing technique |
| CN101805824A (en) * | 2010-03-23 | 2010-08-18 | 中信重工机械股份有限公司 | Interrupted quenching thermal treatment method of 42CrMo4 roller shaft |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106493518A (en) * | 2016-11-02 | 2017-03-15 | 常州泉汇重工科技有限公司 | Steel alloy circle quenching roller production technology used by galvanized wire |
| CN108313087A (en) * | 2017-12-13 | 2018-07-24 | 浙江大学 | A kind of vortex rail braking system wearing plate and its manufacturing method |
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Application publication date: 20120711 |