CN101985675A - 6Cr12W2Si isothermal quenching process - Google Patents
6Cr12W2Si isothermal quenching process Download PDFInfo
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- CN101985675A CN101985675A CN2010105418148A CN201010541814A CN101985675A CN 101985675 A CN101985675 A CN 101985675A CN 2010105418148 A CN2010105418148 A CN 2010105418148A CN 201010541814 A CN201010541814 A CN 201010541814A CN 101985675 A CN101985675 A CN 101985675A
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- isothermal
- minutes
- quenching process
- 6cr12w2si
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Abstract
The invention relates to a 6Cr12W2Si isothermal quenching process which comprises the following steps: insulating at the quenching heating temperature of 1040 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 310 DEG C for carrying out isothermal treatment for 3 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. 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 6Cr
12W
2The Si isothermal quenching technique.
Background technology
Domestic special steel manufacturing adopts that conventional martensite is quenched, tempering heat treatment process.Because martensitic stucture is hard and crisp, in the thermal treatment heat-processed, the agent for special steel surface oxidation and decarbonization, the back of quenching forms surperficial tensile stress, transports collision at inter process the special steel cracking often takes place, and grinds to add easily to form grinding crack man-hour; Secondly, special steel in use, the load that withstands shocks is big, working conditions is abominable, has quite a few special steel cracking and rib to rupture; Moreover the marquench workpiece deformation is big, scrap rate is high and the mill finishing allowance is big, and production causes very big waste to special steel.
Summary of the invention
In view of the defective that prior art exists, the present invention has designed a kind of 6Cr
12W
2The Si isothermal quenching technique uses the special steel after this art breading to have 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 6Cr
12W
2Si isothermal quenching technique quenching temperature is 1040 ℃, is benchmark with the workpiece effective thickness, every mm thick insulation 2 minutes, and the cumulative time, workpiece is put into 310 ℃ 50%KNO
3+ NaNo
2Isothermal in the nitrate solution, isothermal time took out in 3 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: quenching technology of the present invention is waited until the lower bainite tissue, improves hardness and impacts patience.
Description of drawings
Fig. 1 is a process schematic representation of the present invention.
Embodiment
6Cr shown in Figure 1
12W
2Si isothermal quenching technique figure: quenching temperature is 1040 ℃, is benchmark with the workpiece effective thickness, and every mm thick insulation 2 minutes supposes that the workpiece net thickness is 10mm, and the cumulative time, then 20 minutes workpiece of insulation are put into 310 ℃ 50%KNO under 1040 ℃ temperature
3Isothermal in the+NaNo2 nitrate solution, isothermal time took out in 3 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, its time is 100 minutes.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 6Cr of means of isothermal quenching
12W
2Si can improve the special steel life-span and the reliability of working under shock-resistant loading capacity and the severe environmental conditions.
Claims (1)
1.6Cr
12W
2The Si isothermal quenching technique is characterized in that: quenching temperature is 1040 ℃, is benchmark with the workpiece effective thickness, every mm thick insulation 2 minutes, and the cumulative time, workpiece is put into 310 ℃ 50%KNO
3+ NaNo
2Isothermal in the nitrate solution, isothermal time took out in 3 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 |
|---|---|---|---|
| CN2010105418148A CN101985675A (en) | 2010-11-12 | 2010-11-12 | 6Cr12W2Si isothermal quenching process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105418148A CN101985675A (en) | 2010-11-12 | 2010-11-12 | 6Cr12W2Si isothermal quenching process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101985675A true CN101985675A (en) | 2011-03-16 |
Family
ID=43710075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105418148A Pending CN101985675A (en) | 2010-11-12 | 2010-11-12 | 6Cr12W2Si isothermal quenching process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101985675A (en) |
-
2010
- 2010-11-12 CN CN2010105418148A patent/CN101985675A/en active Pending
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110316 |