CN102965481A - Heat treatment method for reducing steel cold cracks - Google Patents
Heat treatment method for reducing steel cold cracks Download PDFInfo
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- CN102965481A CN102965481A CN 201210491563 CN201210491563A CN102965481A CN 102965481 A CN102965481 A CN 102965481A CN 201210491563 CN201210491563 CN 201210491563 CN 201210491563 A CN201210491563 A CN 201210491563A CN 102965481 A CN102965481 A CN 102965481A
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Abstract
The invention discloses a heat treatment method for reducing steel cold cracks. The heat treatment method is characterized by comprising the following heat treatment steps of: (1) after rough machining, placing steel in a heating furnace for preheating, warming up for preheating at 500-600 DEG C, and lasting for 4 hours; (2) after preheating treatment, carrying out high-temperature quenching on the steel at the quenching temperature of 950-1050 DEG C, and preserving heat for 3 hours; (3) placing the steel in a heat preserving furnace, raising the temperature in the furnace to 450-550 DEG C, carrying out heat preservation treatment, and lasting for 5 hours; and (4) after the heat preservation treatment for the steel, and decreasing the temperature in the heat preserving furnace to 70-110 DEG C, taking the steel out of the furnace, and carrying out air cooling to room temperature. The heat treatment method provided by the invention adopts martempering to avoid the defect that the steel cracks caused by excessively fast quenching and cooling, and is a heat treatment method used in industry.
Description
Technical field
The present invention relates to the heat treating method that uses in a kind of industry.
Background technology
In the existing heat treating method, in order to improve the hardness of steel surface, water is quenched, steel part is cooled off fast, make the steel surface hardness after the quenching enough high, excessive temperature differentials produces cold crack but such low temperature rapid quenching method causes steel surface easily, therefore, how to solve that quench cooling rate is too fast to cause the generation of cold crack to become our problem anxious to be resolved.
Summary of the invention
The present invention is to the proposition of above problem, and a kind of heat treating method of research and design is too fast in order to solve existing heat treating method quench cooling rate, causes easily the shortcoming of the generation of cold crack.The technique means that the present invention adopts is as follows:
A kind of heat treating method that reduces the steel cold crack is characterized in that comprising following heat treatment step:
(1) described steel place preheating in the process furnace through after the roughing, 500 ℃～600 ℃ intensification preheatings, continue 4 hours;
(2) described steel preheating carries out quench hot after processing, quenching temperature is at 950 ℃～1050 ℃, be incubated 3 hours, first steel are placed the quenching oil quenching, when steel were cooled to 400 ℃～450 ℃, the taking-up steel were put into water and are carried out secondary quenching, when steel are cooled to 90 ℃～130 ℃, take out steel from water, air cooling is to room temperature;
(3) with in the described steel holding furnace, temperature in the stove is risen to 450 ℃～550 ℃, be incubated processing, continue 5 hours;
(4) after the insulation of described steel is processed, behind holding furnace temperature drop to 70 ℃～110 ℃, described steel are taken out in stove, air cooling is to room temperature.
Can also be air blast cooling as the secondary quenching described in the preferred described step (2).
Compared with the prior art, the present invention has the following advantages:
1, heat treating method of the present invention quenches with the slower quenching oil of quenching cooling rate first, after temperature drops to a certain degree, lowers the temperature faster with quenching again that water quenches, and has avoided the too fast shortcoming that causes the generation of cold crack of quench cooling rate;
2, quenching oil and who heat treating method of the present invention adopted respectively quench and strengthened the toughness of steel.
The present invention has simple, can be used for industrial mass manufacture, is suitable for the needs that large-scale industrial is produced, and has higher engineering using value, and it puts goods on the market and will produce significantly Social benefit and economic benefit.
Embodiment
Embodiment 1, and a kind of heat treating method that reduces the steel cold crack is characterized in that comprising following heat treatment step:
(1) described steel place preheating in the process furnace through after the roughing, 500 ℃～600 ℃ intensification preheatings, continue 4 hours;
(2) described steel preheating carries out quench hot after processing, quenching temperature is at 950 ℃～1050 ℃, be incubated 3 hours, first steel are placed the quenching oil quenching, when steel were cooled to 400 ℃～450 ℃, the taking-up steel were put into water and are carried out secondary quenching, when steel are cooled to 90 ℃～130 ℃, take out steel from water, air cooling is to room temperature;
(3) with in the described steel holding furnace, temperature in the stove is risen to 450 ℃～550 ℃, be incubated processing, continue 5 hours;
(4) after the insulation of described steel is processed, behind holding furnace temperature drop to 70 ℃～110 ℃, described steel are taken out in stove, air cooling is to room temperature.
Secondary quenching described in the described step (2) can also be air blast cooling.
Heat treating method of the present invention quenches with the slower quenching oil of quenching cooling rate first, after temperature drops to a certain degree, lowers the temperature faster with quenching again that water quenches, and has avoided the too fast shortcoming that causes the generation of cold crack of quench cooling rate; Adopt respectively quenching oil and who to quench and strengthened the toughness of steel.Can be used for industrial mass manufacture, be suitable for the needs that large-scale industrial is produced, have higher engineering using value, it puts goods on the market and will produce significantly Social benefit and economic benefit.
The above; only be the better embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, all should be encompassed within protection scope of the present invention.
Claims (2)
1. heat treating method that reduces the steel cold crack is characterized in that comprising following heat treatment step:
(1) described steel place preheating in the process furnace through after the roughing, 500 ℃～600 ℃ intensification preheatings, continue 4 hours;
(2) described steel preheating carries out quench hot after processing, quenching temperature is at 950 ℃～1050 ℃, be incubated 3 hours, first steel are placed the quenching oil quenching, when steel were cooled to 400 ℃～450 ℃, the taking-up steel were put into water and are carried out secondary quenching, when steel are cooled to 90 ℃～130 ℃, take out steel from water, air cooling is to room temperature;
(3) with in the described steel holding furnace, temperature in the stove is risen to 450 ℃～550 ℃, be incubated processing, continue 5 hours;
(4) after the insulation of described steel is processed, behind holding furnace temperature drop to 70 ℃～110 ℃, described steel are taken out in stove, air cooling is to room temperature.
2. the antioxidant heat treatment method of a kind of steel according to claim 1, it is characterized in that: the secondary quenching described in the described step (2) can also be air blast cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210491563 CN102965481A (en) | 2012-11-27 | 2012-11-27 | Heat treatment method for reducing steel cold cracks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210491563 CN102965481A (en) | 2012-11-27 | 2012-11-27 | Heat treatment method for reducing steel cold cracks |
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| CN102965481A true CN102965481A (en) | 2013-03-13 |
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| CN 201210491563 Pending CN102965481A (en) | 2012-11-27 | 2012-11-27 | Heat treatment method for reducing steel cold cracks |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103667614A (en) * | 2013-12-09 | 2014-03-26 | 常熟市永达化工设备厂 | Heat treatment method for raising steel toughness |
| CN104726655A (en) * | 2015-02-25 | 2015-06-24 | 张岗 | Shell of mobile communication equipment and preparation method of shell |
| CN107587085A (en) * | 2017-09-08 | 2018-01-16 | 太仓森楚源机械设备有限公司 | A kind of quenching technical of high intensity hardware stamping part |
-
2012
- 2012-11-27 CN CN 201210491563 patent/CN102965481A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103667614A (en) * | 2013-12-09 | 2014-03-26 | 常熟市永达化工设备厂 | Heat treatment method for raising steel toughness |
| CN104726655A (en) * | 2015-02-25 | 2015-06-24 | 张岗 | Shell of mobile communication equipment and preparation method of shell |
| CN107587085A (en) * | 2017-09-08 | 2018-01-16 | 太仓森楚源机械设备有限公司 | A kind of quenching technical of high intensity hardware stamping part |
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Application publication date: 20130313 |