CN1028298C - Technique for heat treatment of V3N super-hardness high-speed steel - Google Patents
Technique for heat treatment of V3N super-hardness high-speed steel Download PDFInfo
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- CN1028298C CN1028298C CN 92110969 CN92110969A CN1028298C CN 1028298 C CN1028298 C CN 1028298C CN 92110969 CN92110969 CN 92110969 CN 92110969 A CN92110969 A CN 92110969A CN 1028298 C CN1028298 C CN 1028298C
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Abstract
The present invention provides heat treatment technology of V3N superhard high-speed steel, which is characterized in that the technology of vacuum heating oil quenching and temperature shift multiple tempering is adopted; the vacuum degree is 1*10<-2>-80 torr; the preheating temperature for the first time is 850 to 900 DEG C; the preheating temperature for the second time is 1050 to 1100 DEG C; the quenching temperature is 1220 to 1280 DEG C; the heat preservation time is 40 sec/mm to 60 min/mm; the cooling mode is oil cooling; afterwards, the temperature shift multiple tempering is adopted. The present invention has the advantage of easy operation, and the stable quality of large industrial production is ensured. The hardness of a V3N cutter mould can achieve the high level of HRC68 to 69.5. The present invention can save energy and reduce consumption and cost. The V3N cutter mould has lowest price performance ratio and strong market competitive power.
Description
The invention belongs to rapid steel heat treatment technics field, specifically is vacuum hardening of a kind of V3N super-hard high-speed steel and tempering process.
The W12Mo3Cr4V3N(that professor Chen Jingrong of University of Science ﹠ Technology, Beijing presides over development is called for short V3N) be a kind of novel no cobalt superhard high speed steel, obtained national invention third prize in 1981.Through correct thermal treatment, V3N steel and the world are now with the 3%V level super-hard high-speed steel HSP-15(Sweden that contains cobalt) have identical hardness (HRC66-69.5) and a red hardness, keep the toughness of satisfaction and good processing performance simultaneously, and price is much lower more than cobalt-containing super-hard high-speed steel, and the price of V3N product is that the 1/4V3N cutter of HSP-15 is than coventional type W18Cr4V(T1 approximately on the world market) and W6Mo5Cr4V2(M2) rapid steel improve 2～3 times of life-spans; Be used for cold-work die and improve 5～20 times of life-spans than coventional type die steel CrWMn and Cr12MoV.Therefore, V3N cutter, mould have vast market prospect, and economic benefit and social benefit are all very remarkable, are a kind of regeneration products of going up level.The V3N super-hard high-speed steel has adopted salt bath quenching, 540～560 ℃ of four tempering process always since invention.Carry out industrial production according to this operational path, it is stable inadequately that quality often takes place, and hardness is difficult to the stable high level that reaches ultrahigh hardness HRC68～69.5.This brings difficulty for the production of high-performance V3N cutter, application.The V3N steel heat treatment process strictness of tracing it to its cause, particularly quenching temperature control is wanted accurately, and salt temperature control is inaccurate, and temperature fluctuation is big, and the hardening step operation is influenced greatly by human factor, thereby industrial production can not guarantee the high rigidity of homogeneous greatly.A certain numerical value carries out the also age hardening effect of inaccessible the best of four tempering process between adopting 540～560 ℃.In addition, the salt bath heating is seriously polluted, poor working environment, and energy consumption is big, and utility appliance is many, and the occupation of land place is big.In recent ten years, along with the development of vacuum technique, equipment, rapid steel thermal treatment both at home and abroad gradually adopts the vacuum hardening technology.That vacuum heat treatment can be ensured the quality of products is stable, performance improves, be out of shape small, reduce environmental pollution, saving electric power.Economic and Efficiency Analysis shows in the practical application, and the current consumption of vacuum heat treatment furnace is 1/2～1/4 of salt bath furnace, and the working cost of vacuum oven reduces about 30% than salt bath furnace simultaneously.The vacuum hardening technology is generally vacuum oil quenching and vacuum air-quenching.Vacuum air-quenching is at quenching pressure hours (＜1 * 10
5Pa), cooling power is not enough, has reduced age hardening effect, can make hardness reduce HRC2～3(and see Table 1).(＞12 * 12mm) need to adopt high pressure gas quenching, could guarantee the secondary hardening ability greatly for size.But high pressure gas quenching equipment is much more expensive than vacuum oil quenching equipment, and purity nitrogen consumption in service is big, has increased production cost.Adopt vacuum oil quenching promptly can improve over-all properties and ensure the quality of products, can reduce production costs again.
The objective of the invention is to guarantee big industrial production constant product quality, have high-performance, save the energy, reduce production costs, quicken applying of novel super-hard rapid steel V3N, to obtain remarkable economic efficiency and social benefit.
The present invention is constructed as follows:
The present invention adopts vacuum oil quenching to add repeatedly tempering process of alternating temperature.Quenching apparatus is double-chamber vacuum oil quenching furnace or the double-chamber vacuum oil gas dual-purpose stove of quenching.The heating quenching of workpiece all carries out in vacuum oven, and be 2～4 hours the working time of producing a stove.
1. heating under vacuum oil quenching technology
(1) vacuum tightness 1 * 10 °～1 * 10
3Pa
(2) heating preheating temperature and time
850～900 ℃ of preheatings for the first time are incubated 40～120 minutes
1050～1100 ℃ of preheatings for the second time are incubated 20～40 minutes
(3) quenching temperature and soaking time
1220～1280 ℃ of quenching temperatures, usually at 1240～1270 ℃,
Soaking time 40 seconds/millimeter～6 minutes/millimeter
(4) type of cooling oil cooling
50～80 ℃ of oil temperatures
200～600 ℃ of oil outlet temperatures
The oil pressure 2 * 10 of quenching
3～1 * 10
5Pa
2. alternating temperature tempering process repeatedly.Two groups of technology equivalences can be chosen wherein one group wantonly.
First group
Tempering temperature, is incubated 1.5～2 hours by 540～560 ℃ for the first time;
Tempering temperature, is incubated 1.5～2 hours by 570～590 ℃ for the second time;
Tempering temperature, is incubated 1.5～2 hours by 540～560 ℃ for the third time;
The 4th tempering temperature, is incubated 1.5～2 hours by 520～540 ℃;
Second group
Tempering temperature, is incubated 1.5～2 hours by 570～580 ℃ for the first time;
Tempering temperature, is incubated 1.5～2 hours by 540～560 ℃ for the second time;
Tempering temperature, is incubated 1.5～2 hours by 540～560 ℃ for the third time;
The 4th tempering temperature, is incubated 1.5～2 hours by 520～540 ℃;
Effect of the present invention is to guarantee that tool and mould reaches ultrahigh hardness HRC68～69.5 high levels, save energy and reduce the cost simultaneously, reduce cost, easy to operate, be easy to suitability for industrialized production.
Embodiment sees Table 1.(table is seen the literary composition back)
Table 1 embodiment 1
Workpiece title high-speed steel lathe tool high-speed steel lathe tool high-speed steel lathe tool shearing die
Steel material V3N V3N V3N V3N
Specification (mm) 8 * 8 * 200 12 * 12 * 150 20 * 20 * 200 Φ 42 * 32
Quantity (part) 493 60 102 12
Thermal treatment process
850 900 850 850
Preheating for the first time (℃)
1.33 13.3 1.33 1.33
Vacuum tightness (Pa)
Preheating for the second time (℃) 1,050 1,050 1,050 1050
Vacuum tightness (Pa) 60 1 * 10
-260 60
Quenching temperature ℃ 1,265 1,255 1,255 1265
Vacuum tightness (Pa) 9 * 10
31.33 9 * 10
39 * 10
4
Oil quenching pressure (Pa) 6 * 10
46 * 10
46 * 10
4
The gas pressure (Pa) 6.6 * 10 of quenching
4
Tempering for the first time ℃ 560 560 560 575
Tempering for the second time ℃ 575 575 575 560
Tempering for the third time ℃ 560 560 560 555
The 4th tempering ℃ 520 520 520 520
Quenching hardness HRC 64.5 67 65 64.5
Tempered-hardness
68～69.5 66 68 68～69.5
HRC
Claims (2)
1, a kind of thermal treatment process of V3N super-hard high-speed steel is characterized in that taking repeatedly tempering process of vacuum oil quenching, alternating temperature, that is:
(1) vacuum oil quenching technology:
Vacuum tightness 1 * 10 °～1 * 10
3Pa, preheating temperature is 850～900 ℃ for the first time, is incubated 40 minutes to 2 hours; Preheating temperature is 1050～1100 ℃ for the second time, is incubated 20 to 40 minutes; 1220 ℃～1280 ℃ of quenching temperatures are incubated 40 seconds/millimeter to 6 minutes/millimeter; The type of cooling is an oil cooling, and oil temperature is 50～80 ℃, and oil outlet temperature is 200～600 ℃, and the oil pressure of quenching is 2 * 10
3～1 * 10
5Pa,
(2) alternating temperature tempering process repeatedly:
First group:
Tempering temperature, is incubated 1.5～2 hours by 540～560 ℃ for the first time;
Tempering temperature, is incubated 1.5～2 hours by 570～590 ℃ for the second time;
Tempering temperature, is incubated 1.5～2 hours by 540～560 ℃ for the third time;
The 4th tempering temperature, is incubated 1.5～2 hours by 520～540 ℃;
Or second group:
Tempering temperature, is incubated 1.5～2 hours by 570～580 ℃ for the first time;
Tempering temperature, is incubated 1.5～2 hours by 540～560 ℃ for the second time;
Tempering temperature, is incubated 1.5～2 hours by 540～560 ℃ for the third time;
The 4th tempering temperature, is incubated 1.5～2 hours by 520～540 ℃;
2, the thermal treatment process of V3N super-hard high-speed steel according to claim 1 is characterized in that 1240～1270 ℃ of the temperature prioritised selections of oil quenching, 550～560 ℃ for the first time of tempering temperatures, 570～580 ℃ for the second time, 550～560 ℃ for the third time, the 4th time 540 ℃, each 1.5 hours to 2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92110969 CN1028298C (en) | 1992-09-29 | 1992-09-29 | Technique for heat treatment of V3N super-hardness high-speed steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92110969 CN1028298C (en) | 1992-09-29 | 1992-09-29 | Technique for heat treatment of V3N super-hardness high-speed steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1085257A CN1085257A (en) | 1994-04-13 |
| CN1028298C true CN1028298C (en) | 1995-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 92110969 Expired - Fee Related CN1028298C (en) | 1992-09-29 | 1992-09-29 | Technique for heat treatment of V3N super-hardness high-speed steel |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798620B (en) * | 2010-04-10 | 2011-12-07 | 江阴市江顺模具有限公司 | Thermal treatment method for large-size complex cross section mold for extruding sectional material of train body |
| CN102220461A (en) * | 2010-04-16 | 2011-10-19 | 斯帝尔模具(上海)有限公司 | Heat treatment method for heat half-module material |
| CN102719645B (en) * | 2012-05-23 | 2014-08-27 | 温岭市永鑫工具有限公司 | Heat treatment method for twist drills |
| CN109280753A (en) * | 2018-10-16 | 2019-01-29 | 曾令炎 | A kind of processing technology of rock wool centrifuge roller |
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1992
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| CN1085257A (en) | 1994-04-13 |
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