CN103103320A - Method for improving low temperature impact toughness of 40CrNiMoA material - Google Patents
Method for improving low temperature impact toughness of 40CrNiMoA material Download PDFInfo
- Publication number
- CN103103320A CN103103320A CN2013100543821A CN201310054382A CN103103320A CN 103103320 A CN103103320 A CN 103103320A CN 2013100543821 A CN2013100543821 A CN 2013100543821A CN 201310054382 A CN201310054382 A CN 201310054382A CN 103103320 A CN103103320 A CN 103103320A
- Authority
- CN
- China
- Prior art keywords
- 40crnimoa
- low temperature
- low
- temperature
- temperaturetempering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a method for improving the low temperature impact toughness of a 40CrNiMoA material. The method comprises: first cooling the 40CrNiMoA material to a temperature ranging from -80DEG C to -85DEG C at a rate of 2-3DEG C/min, conducting heat preservation for 0.5h-1h; then performing further cooling to a temperature ranging from -180DEG C to -185DEG C, and conducting heat preservation for 2h-3h; and then, raising the temperature to 160DEG C-170DEG C still at a rate of 2-3DEG C/min, conducting heat preservation for 1h-2h, and finally performing cooling along with a furnace. The low temperature impact toughness of the 40CrNiMoA material treated by the method provided in the invention is higher than that of materials that do not undergo deep cooling and low temperature tempering treatments. Thus, the method provided in the invention has great industrial application prospects.
Description
Technical field
The present invention relates to sub-zero treatment and heat treated technical field, be specifically related to a kind of method of the 40CrNiMoA of raising material at low temperature impelling strength.
Background technology
The 40CrNiMoA steel has higher intensity and toughness, and hardening capacity is also fine, is widely used in the larger strength member of petrochemical complex, petroleum drilling and mining equipment, offshore oil drilling platform and cross section and load etc.In order to give full play to its comprehensive mechanical property, all use under quality adjustment condition.Because the service condition of petroleum drilling and mining equipment is very abominable, wherein many is to work in severe cold environment, for the low temperature impact properties of material, certain requirement is arranged.Important evidence when on the other hand, the low temperature impact properties of material also is structure design.The cryomechanics behavior of metallic substance has material impact to military service and the security of equipment, and the data of the low-temperature impact toughness aspect of 40CrNiMoA material relatively lack, the impelling strength of particularly-60 ℃ of following temperature has no report, thereby has brought disadvantageous effect for actual design and the application of 40CrNiMoA material.
Along with the development of China's industrial technology and the harshness of working conditions, the low-temperature flexibility of material 40CrNiMoA is had higher requirement.The present invention intends improving by deep cooling and low-temperaturetempering treatment process the low-temperature impact toughness of 40CrNiMoA material, improves its military service performance.
Summary of the invention
The object of the present invention is to provide a kind of method of the 40CrNiMoA of raising material at low temperature impelling strength, the technique that has adopted sub-zero treatment to combine with low-temperaturetempering, concrete technical scheme is as follows:
A kind of method that improves 40CrNiMoA material at low temperature impelling strength, comprise the following steps: will be cooled to-80 ℃ ~-85 ℃ with the speed of 2 ~ 3 ℃/min through the 40CrNiMoA material of vacuum oil quenching and vacuum high-temperature tempering, and insulation 0.5h ~ 1h, after finishing, insulation continues to be cooled to-180 ℃ ~-185 ℃ with the speed of 2 ~ 3 ℃/min, and insulation 2h ~ 3h; Carry out at last low-temperaturetempering.
Further, described low-temperaturetempering is for being heated to 160 ~ 170 ℃.
Again further, after being heated to 160 ~ 170 ℃, be incubated 1 ~ 2 hour.
Preferably, described low-temperaturetempering temperature-rise period adopts the temperature control speed of 2 ~ 3 ℃/min.
Preferably, furnace cooling after described low-temperaturetempering.
The art treatment that the present invention has adopted sub-zero treatment to combine with low-temperaturetempering.Sub-zero treatment, be often referred to treatment temp and be the deepfreeze of-100 ℃～-196 ℃, it is placed in specific and controlled low temperature environment with processed workpiece, the heterogeneous microstructure of material is changed, show as raising and the improvement of the aspect such as wear resistance, dimensional stability, tensile strength, unrelieved stress, toughness of material on macroscopic view.The technique that sub-zero treatment of the present invention combines with low-temperaturetempering it is advantageous that cooling and temperature-rise period medium-rate whole process are controlled, and workpiece temperature changes evenly, has prevented the phenomenon that workpiece different sites temperature differs, and has reduced the inside workpiece unrelieved stress.
By to the heterogeneous microstructure analysis of material 40CrNiMoA as can be known, after sub-zero treatment and low-temperaturetempering, material in the inside of crystal grain and crystal boundary to have separated out quantity more, the tiny carbide particle that disperse distributes, this be mainly due to material in the sub-zero treatment process, residual austenite increases to the phase driving force of martensitic transformation, causes the matrix volumetric shrinkage, causes the lattice constant of iron-based body to reduce.This can produce very large microcosmic internal stress and little distortion on the one hand in matrix, lattice defect is significantly increased; The lattice distortion that supersaturation carbon causes is increased, cause the thermodynamic driving force of carbide precipitate to increase.Therefore with rear go up to room temperature and the process of follow-up low-temperaturetempering in, the diffusibility of carbon atom strengthens, and causes separating out at the lattice defect place the tiny carbide with the matrix coherence.In addition, by sub-zero treatment and follow-up low-temperaturetempering, reduced the unrelieved stress that material produces in vacuum oil quenching, vacuum high-temperature drawing process.
After the 40CrNiMoA material is processed through method of the present invention, the low-temperature impact toughness of material more is not greatly improved through the material of deep cooling and low-temperaturetempering processing, therefore improve to a certain extent material active time at low temperatures, extended work-ing life.
Embodiment
Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
Embodiment 1
Will be through the 40CrNiMoA material after vacuum oil quenching and vacuum high-temperature tempering, be cooled to-80 ℃, insulation 0.5h with the speed of 2 ℃/min;
Then continue to be cooled to-180 ℃ with the speed of 2 ℃/min insulation 3h; Subsequently this 40CrNiMoA material is heated to 160 ℃ with the heating rate of 2 ℃/min, insulation 2h; Furnace cooling after low-temperaturetempering technique finishes.
The low temperature impact properties that 40CrNiMoA material after processing carries out under differing temps is tested, and the used test method adopts standard GB/T/T 229-2007 " the metallic substance summer is than pendulum impact test method ", and test result is as shown in table 1.
Embodiment 2
To be cooled to-85 ℃ with the speed of 3 ℃/min through the 40CrNiMoA material after vacuum oil quenching and vacuum high-temperature tempering (material is with embodiment 1), insulation 1h; Then continue to be cooled to-180 ℃ with the speed of 3 ℃/min insulation 2h; Subsequently this 40CrNiMoA material is heated to 170 ℃ with the heating rate of 3 ℃/min, insulation 2h; Furnace cooling after low-temperaturetempering technique finishes.
The low temperature impact properties that 40CrNiMoA after processing carries out under differing temps is tested, and the used test method all adopts standard GB/T/T 229-2007 " the metallic substance summer is than pendulum impact test method ", and test result is as shown in table 1.
Comparative Examples 1, will be through the 40CrNiMoA material after vacuum oil quenching and vacuum high-temperature tempering (material be with embodiment 1), process without sub-zero treatment and low-temperaturetempering, carry out the low temperature impact properties test under differing temps, the used test method all adopts the respective country standard, and test result is as shown in table 1.
The 40CrNiMoA Impact Properties of Materials test result of table 1 embodiment 1 ~ 2 and Comparative Examples 1
As shown in table 1, after processing through method of the present invention, the low-temperature impact toughness of 40CrNiMoA material is all than the material through deep cooling and low-temperaturetempering processing is not high, therefore by art treatment of the present invention, the 40CrNiMoA material has extended the work-ing life under low temperature, can satisfy product and equipment and comparatively work for a long time under the atrocious weather envrionment conditions.
Claims (5)
1. method that improves 40CrNiMoA material at low temperature impelling strength, it is characterized in that: will be cooled to-80 ℃ ~-85 ℃ with the speed of 2 ~ 3 ℃/min through the 40CrNiMoA material of vacuum oil quenching and vacuum high-temperature tempering, and insulation 0.5h ~ 1h, after finishing, insulation continues to be cooled to-180 ℃ ~-185 ℃ with the speed of 2 ~ 3 ℃/min, and insulation 2h ~ 3h; Carry out at last low-temperaturetempering.
2. a kind of method that improves 40CrNiMoA material at low temperature impelling strength according to claim 1, it is characterized in that: described low-temperaturetempering is for being heated to 160 ~ 170 ℃.
3. a kind of method that improves 40CrNiMoA material at low temperature impelling strength according to claim 2, is characterized in that: after being heated to 160 ~ 170 ℃, be incubated 1 ~ 2 hour.
4. a kind of method that improves 40CrNiMoA material at low temperature impelling strength according to claim 2, is characterized in that: the temperature control speed of 2 ~ 3 ℃/min of described low-temperaturetempering temperature-rise period employing.
5. a kind of method that improves 40CrNiMoA material at low temperature impelling strength according to claim 1, is characterized in that: furnace cooling after described low-temperaturetempering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310054382.1A CN103103320B (en) | 2013-02-20 | 2013-02-20 | Method for improving low temperature impact toughness of 40CrNiMoA material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310054382.1A CN103103320B (en) | 2013-02-20 | 2013-02-20 | Method for improving low temperature impact toughness of 40CrNiMoA material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103103320A true CN103103320A (en) | 2013-05-15 |
| CN103103320B CN103103320B (en) | 2015-02-25 |
Family
ID=48311510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310054382.1A Expired - Fee Related CN103103320B (en) | 2013-02-20 | 2013-02-20 | Method for improving low temperature impact toughness of 40CrNiMoA material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103103320B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103305669A (en) * | 2013-06-14 | 2013-09-18 | 中国科学院理化技术研究所 | Cryogenic treatment method for improving dimensional stability of GCr15 steel |
| CN108531700A (en) * | 2018-03-26 | 2018-09-14 | 西南大学 | A kind of cryogenic treatment process improving the quenched Steel Properties of 42CrMo |
| CN109022687A (en) * | 2018-07-27 | 2018-12-18 | 上海工程技术大学 | A kind of cryogenic treatment process of joint of petroleum drill rod |
| CN109182667A (en) * | 2018-11-13 | 2019-01-11 | 东莞市国森科精密工业有限公司 | A kind of method that 40CrNiMoA steel forgings grain size improves |
| CN111850430A (en) * | 2020-07-23 | 2020-10-30 | 杭州科技职业技术学院 | Composite material for LNG (liquefied natural gas) ultralow-temperature valve and preparation method of composite material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000006960A1 (en) * | 1998-07-28 | 2000-02-10 | Nu-Bit, Inc. | Process for nitriding of metal containing materials |
| GB2355217A (en) * | 1999-10-15 | 2001-04-18 | Dexter Lawson Mfg Inc | Treatment of a paper drill bit |
| WO2001068933A2 (en) * | 2000-03-14 | 2001-09-20 | The Timken Company | High performance carburizing stainless steel for high temperature use |
| CN101560591A (en) * | 2009-05-21 | 2009-10-21 | 上海市机械制造工艺研究所有限公司 | Composite temperature cold treatment process |
-
2013
- 2013-02-20 CN CN201310054382.1A patent/CN103103320B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000006960A1 (en) * | 1998-07-28 | 2000-02-10 | Nu-Bit, Inc. | Process for nitriding of metal containing materials |
| GB2355217A (en) * | 1999-10-15 | 2001-04-18 | Dexter Lawson Mfg Inc | Treatment of a paper drill bit |
| WO2001068933A2 (en) * | 2000-03-14 | 2001-09-20 | The Timken Company | High performance carburizing stainless steel for high temperature use |
| CN101560591A (en) * | 2009-05-21 | 2009-10-21 | 上海市机械制造工艺研究所有限公司 | Composite temperature cold treatment process |
Non-Patent Citations (3)
| Title |
|---|
| 李智超 等: "低中碳合金结构钢深冷处理试验研究", 《阜新矿业学院学报（自然科学版）》, vol. 12, no. 1, 31 January 1993 (1993-01-31) * |
| 李智超 等: "液氮深冷处理改善合金结构钢韧性的探讨", 《阜新矿业学院学报》, vol. 7, no. 3, 30 September 1988 (1988-09-30), pages 73 - 2 * |
| 葛凯晨 等: "冷处理对合金结构钢力学性能的影响", 《热加工工艺》, vol. 36, no. 16, 31 August 2010 (2010-08-31) * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103305669A (en) * | 2013-06-14 | 2013-09-18 | 中国科学院理化技术研究所 | Cryogenic treatment method for improving dimensional stability of GCr15 steel |
| CN103305669B (en) * | 2013-06-14 | 2015-10-07 | 中国科学院理化技术研究所 | A kind of cryogenic treating process improving GCr15 steel dimensions stability |
| CN108531700A (en) * | 2018-03-26 | 2018-09-14 | 西南大学 | A kind of cryogenic treatment process improving the quenched Steel Properties of 42CrMo |
| CN109022687A (en) * | 2018-07-27 | 2018-12-18 | 上海工程技术大学 | A kind of cryogenic treatment process of joint of petroleum drill rod |
| CN109182667A (en) * | 2018-11-13 | 2019-01-11 | 东莞市国森科精密工业有限公司 | A kind of method that 40CrNiMoA steel forgings grain size improves |
| CN111850430A (en) * | 2020-07-23 | 2020-10-30 | 杭州科技职业技术学院 | Composite material for LNG (liquefied natural gas) ultralow-temperature valve and preparation method of composite material |
| CN111850430B (en) * | 2020-07-23 | 2021-08-06 | 杭州科技职业技术学院 | Composite material for LNG (liquefied natural gas) ultralow-temperature valve and preparation method of composite material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103103320B (en) | 2015-02-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106756755B (en) | The carburization quenching method of large excavator gear | |
| CN103266212B (en) | Thermal treatment technology for improving low-temperature impact toughness of 25Cr2Ni4MoV steel forging | |
| CN103343281B (en) | A kind of lamellar two-phase high-strength and high-toughness steel and preparation method thereof | |
| CN102534134A (en) | Bainite isothermal quenching thermal treatment process method for medium-carbon bearing steel | |
| CN103103320B (en) | Method for improving low temperature impact toughness of 40CrNiMoA material | |
| CN105506249A (en) | Heat treatment method for high-nitrogen corrosion resistant plastic die steel | |
| CN104232875A (en) | Heat treatment process of bearing ring (3m) of shield tunneling machine | |
| CN109609848A (en) | High tough antifatigue nano-scaled precipitate enhancing Ma-Austria's Multiphase Steel and preparation method thereof | |
| CN112981277B (en) | Preparation method of ultrahigh-strength medium-carbon nano bainite steel | |
| CN107345267B (en) | A kind of high-performance TBM disk cutter heat treatment process | |
| CN104593573A (en) | Combined thermomechanical treatment strengthening method for efficiently improving strength and toughness of non-quenched and tempered steel | |
| CN102851470B (en) | Heat treatment technique capable of overcoming bulky or cellular precipitation of superhigh-carbon steel carbide | |
| CN104164548B (en) | A kind of thermal treatment process of thick and large section low-carbon low-alloy steel forge piece | |
| CN1718768A (en) | Bainite auctile iron isothermal quenching technology | |
| CN103184319A (en) | Heat treatment method for increasing low-temperature impact energy of 35CrMoA steel material | |
| CN102899469B (en) | Heat-treatment method of high-chromium wear-resistant white cast iron Cr28 | |
| CN102758068A (en) | Heat treatment method of GCr15 steel | |
| CN104451705A (en) | Gear manufacturing process | |
| CN106086360A (en) | A kind of heat treatment method of Industrial Steam Turbine Rotors Aided forging | |
| CN102021479B (en) | Si-containing medium carbon steel and thermal treatment method for Si-containing medium carbon steel to obtain high strength and elasticity | |
| CN113584267A (en) | Dynamic isothermal treatment method for high-carbon nano bainite steel structure | |
| CN104232858A (en) | Spheroidizing annealing technology of high-tenacity fastener wire rod | |
| CN108866443B (en) | Normalizing type low-yield-ratio high-strength steel plate and preparation method thereof | |
| CN105018712A (en) | Spheroidizing annealing process of superplastic medium carbon steel wire | |
| CN110964890A (en) | Heat treatment method of high-hardness high-impact-toughness alloy material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150225 Termination date: 20170220 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |