CN101985684A - GCr15 roller quenching process - Google Patents
GCr15 roller quenching process Download PDFInfo
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- CN101985684A CN101985684A CN2010105421314A CN201010542131A CN101985684A CN 101985684 A CN101985684 A CN 101985684A CN 2010105421314 A CN2010105421314 A CN 2010105421314A CN 201010542131 A CN201010542131 A CN 201010542131A CN 101985684 A CN101985684 A CN 101985684A
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Abstract
The invention relates to a GCr15 roller quenching process which comprises the following steps: insulating at the quenching heating temperature of 820 DEG C for cumulative time according to the reference that a workpiece with each millimeter of effective wall thickness is insulated for 2 minutes; putting the workpiece into a 50%KNO3 and NaNo2 nitrate solution at 290 DEG C for carrying out isothermal treatment for 2 hours, and then, taking out the workpiece; and tempering the workpiece at 180 DEG C thrice for cumulative time according to the reference that the workpiece with each millimeter of effective thickness is insulated for 10 minutes. By using the nitrate for quenching, the invention ensures the hardness of a GCr15 roller. The quenching process obtains a lower bainite structure, and improves the hardness and the impact resistance of the lower bainite structure.
Description
Technical field
The present invention relates to a kind of thermal treatment process that material is carried out isothermal quenching, especially to GCr
15The roller quenching complete processing.
Background technology
Domestic GCr
15Roll is made, and adopts that conventional martensite is quenched, tempering heat treatment process.Because martensitic stucture is hard and crisp, in the thermal treatment heat-processed, GCr
15The roller surface oxidation and decarbonization, the back of quenching forms surperficial tensile stress, in inter process transportation collision GCr often takes place
15Roll cracking, mill add the easy grinding crack that forms in man-hour; Secondly, GCr
15Roll in use, the load that withstands shocks is big, working conditions is abominable, and quite a few GCr is arranged
15Roll cracking and rib fracture; Moreover the marquench workpiece deformation is big, scrap rate is high and the mill finishing allowance is big, gives GCr
15Roll production causes very big waste.
Summary of the invention
In view of the defective that prior art exists, the present invention has designed a kind of GCr
15The roller quenching complete processing is used the GCr after this art breading
15Roll has high toughness and long fatigue lifetime, especially works in heavy duty with under impacting, and can improve work-ing life and operating reliability.
For achieving the above object, the technology used in the present invention solution GCr
15The roller quenching complete processing is that quenching temperature is 820 ℃, is benchmark with the workpiece effective thickness, every mm thick insulation 2 minutes, and the cumulative time, workpiece is put into 290 ℃ 50%KNO
3+ NaNo
2Isothermal in the nitrate solution, isothermal time took out in 2 hours, and workpiece is 180 ℃ of tempering three times, and the time is benchmark with the workpiece net thickness, every mm thick insulation 10 minutes, cumulative time.
After adopting such scheme, compared with prior art have following beneficial effect: the present invention adopts nitrate quenching, has guaranteed GCr
15The hardness of roll, quenching technology obtain the lower bainite tissue, improve hardness and impact patience.
Description of drawings
Fig. 1 is a process schematic representation of the present invention.
Embodiment
GCr shown in Figure 1
15Roller quenching complete processing figure: quenching temperature is 650 ℃, is benchmark with the workpiece effective thickness, every mm thick insulation 2 minutes, cumulative time, suppose that the workpiece net thickness is 10mm, then be incubated 20 minutes under 650 ℃ temperature, workpiece is put into 290 ℃ 50%KNO
3Isothermal in the+NaNo2 nitrate solution, isothermal time took out in 2 hours, and workpiece is 180 ℃ of tempering three times, and the time is benchmark with the workpiece net thickness, every mm thick insulation 10 minutes, the cumulative time then is incubated 100 minutes under 180 ℃ temperature.Its tissue of back that quenches has very high obdurability, yield strength and fracture toughness property, and impelling strength is quenched, improved 65% after the tempering than conventional martensite.And 3 tempering have improved the cracked problem of workpiece, therefore, and through the GCr of means of isothermal quenching
15Can improve the GCr that works under shock-resistant loading capacity and the severe environmental conditions
15Roll campaign and reliability.
Claims (1)
1.GCr
15The roller quenching complete processing is that quenching temperature is 820 ℃, is benchmark with the workpiece effective thickness, every mm thick insulation 2 minutes, and the cumulative time, workpiece is put into 290 ℃ 50%KNO
3+ NaNo
2Isothermal in the nitrate solution, isothermal time took out in 2 hours, and workpiece is 180 ℃ of tempering three times, and the time is benchmark with the workpiece net thickness, every mm thick insulation 10 minutes, cumulative time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105421314A CN101985684A (en) | 2010-11-13 | 2010-11-13 | GCr15 roller quenching process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105421314A CN101985684A (en) | 2010-11-13 | 2010-11-13 | GCr15 roller quenching process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101985684A true CN101985684A (en) | 2011-03-16 |
Family
ID=43710084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105421314A Pending CN101985684A (en) | 2010-11-13 | 2010-11-13 | GCr15 roller quenching process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101985684A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170802A (en) * | 2013-03-04 | 2013-06-26 | 南京紫薇精密机械有限公司 | Processing method for improving stability of Gcr15 main shaft |
-
2010
- 2010-11-13 CN CN2010105421314A patent/CN101985684A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 王福祯: "GCr15钢下贝氏体等温淬火试验分析", 《轴承》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170802A (en) * | 2013-03-04 | 2013-06-26 | 南京紫薇精密机械有限公司 | Processing method for improving stability of Gcr15 main shaft |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110316 |