CN107245555A - Improve the double tempering method of 30CrNi2MoV steel forgings low-temperature impact toughness - Google Patents
Improve the double tempering method of 30CrNi2MoV steel forgings low-temperature impact toughness Download PDFInfo
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- CN107245555A CN107245555A CN201710630018.3A CN201710630018A CN107245555A CN 107245555 A CN107245555 A CN 107245555A CN 201710630018 A CN201710630018 A CN 201710630018A CN 107245555 A CN107245555 A CN 107245555A
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- Prior art keywords
- 30crni2mov
- impact toughness
- tempering
- low
- temperature impact
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
Abstract
A kind of double tempering method of raising 30CrNi2MoV steel forgings low-temperature impact toughness, it is characterized in that the steel forgings after forging first are carried out into conventional quenching austenitizing PROCESS FOR TREATMENT, then it is down to room temperature after the end of conventional tempering process, then carry out being heated to 350 DEG C ~ 580 DEG C and being incubated 16h, cooled down by the way of air cooling.Relative to conventional tempering process（600℃×16h）For, crystallite dimension refinement of the present invention can greatly improve the low-temperature impact toughness of 30CrNi2MoV steel, and increase to from 31.7J influences little while 43.67J about improves 40.9% on tensile strength at room temperature and elongation percentage.Present invention process flow is short, advantageously reduces production cost, can meet the manufacture demand of the large-scale load and drive mechanism part in the power station equipments such as China's thermoelectricity, nuclear power and large-scale metallurgical, mine and transportation equipment.
Description
Technical field
The present invention relates to a kind of metal heat treating methods, especially a kind of 30CrNi2MoV Heat-Treatments of Steel method, specifically
It is a kind of double tempering method of raising 30CrNi2MoV steel forgings low-temperature impact toughness that ground, which is said,.
Background technology
30CrNi2MoV steel is a kind of middle carbon medium alloy steel, with high quenching degree and good comprehensive mechanical property, often
Large forgings for manufacturing high-strength tenacity, is widely used in power station equipment and large-scale metallurgical, mine and the fortune such as manufacture thermoelectricity, nuclear power
Load and drive mechanism part in defeated equipment.
30CrNi2MoV steel often works at a lower temperature, there is higher requirement to its low-temperature impact toughness.Usually, steel
The austenitizing technique of iron material is to influence the key factor of performance after its Q-tempering.Intercritical hardening can improve ferrous materials
Low-temperature impact toughness, but improve low-temperature impact toughness intercritical hardening be typically after conventional quenching carry out, but it is this just
The method that normal quenching+intercritical hardening improves material at low temperature impact flexibility, is related to two independent quenchings, technique is relative complex,
Cost is of a relatively high.If by being down to room temperature after the end of conventional tempering process, being then heated to 350 DEG C and being incubated 16h
The method for carrying out air cooling, to improve the low-temperature impact toughness of ferrous materials, undoubtedly with technique is relatively easy, advantage of lower cost
Advantage.Here the purpose of normalized tempering is that the size of stable forging, adjustment is hard in order to eliminate quenching internal stress, reduce fragility
Degree, improves plasticity and toughness, obtains the final required mechanical property of forging.And follow-up average tempering can obtain being tempered Tuo Shi
Body, with high elastic limit, yield strength and yield tensile ratio, while having certain plasticity and toughness.
Up to now, not yet have a kind of suitable 30CrNi2MoV steel increases average tempering work based on continuation after conventional tempering
Skill is available come the method for improving 30CrNi2MoV steel low-temperature impact toughness, and 30CrNi2MoV steel is limited to a certain extent
The lifting of quality and the decline of manufacturing cost.
The content of the invention
The purpose of the present invention is the complex process existed for current 30CrNi2MoV steel forgings heat treatment after forging, cost
Height, technique it is unreasonable influence finished product crystalline phase tissue the problem of, invention one kind after forging slow cooling, isothermal annealing, quenching and tempering group
Into Process ba- sis on increase average tempering improve 30CrNi2MoV steel large forgings structure properties heat treatment method, this method
Suppress the generation of the laminar retained austenite of large forgings by isothermal annealed processes after slow cooling, forging after forging to cut off and disappear
Except Structure Inheritance, by quenching come uniform crystal grain thinning, obtained well by increasing secondary average tempering air cooling after conventional tempering
Comprehensive mechanical property.
The technical scheme is that：
A kind of double tempering method of raising 30CrNi2MoV steel forgings low-temperature impact toughness, it is characterized in that：First by after forging
Steel forgings carry out conventional quenching austenitizing PROCESS FOR TREATMENT, are then cooled to room temperature after conventional tempering process terminates, then enter
Row reheating is to 350 DEG C ~ 580 DEG C and is incubated 16h.
The technological parameter of the conventional quenching austenitizing processing is 860 DEG C × 6h, is cooled down by the way of oil cooling；
Described conventional tempering process is it is characterized in that tempering process is 600 DEG C × 16h, and then use oil cooling mode is cooled down.
Described double tempering technique, room temperature is down to after the end of conventional tempering process, is then heated to 350 DEG C ~ 580
DEG C and be incubated 16h, cooled down using air cooling mode.
Described reheating temperature, it is characterized in that optimum temperature is 350 DEG C.
Beneficial effects of the present invention：
（1）The present invention can keep its tension strong while the low-temperature impact toughness of 30CrNi2MoV steel forgings is significantly improved
Degree change is little.Such as with embodiment one compared with comparative example one, low-temperature impact toughness improves 40.9%, and tensile strength only declines
2.7%, while elongation percentage improves 3.9%.
（2）The present invention is obtained by substantial amounts of experiment and preferably improves 30CrNi2MoV steel forgings low-temperature impact toughness
Double tempering method, obtains 350 DEG C of optimal low tempering temperatures, by the technique of the present invention especially by substantial amounts of experiment
The low-temperature impact toughness of 30CrNi3MoV steel forgings can easily be improved.
（3）The present invention has broken the external technology blockage to large forgings Technology for Heating Processing to a certain extent, can meet
Large-scale load and drive mechanism part in the power station equipments such as China's thermoelectricity, nuclear power and large-scale metallurgical, mine and transportation equipment
Manufacture demand.
Brief description of the drawings
Fig. 1 embodiments one：860 DEG C × 16h oil quenchings, 600 DEG C × 16h oil coolings are tempered to after room temperature is warming up to 350 DEG C again
It is incubated the metallographic structure after 16h air cooling tempers.
Fig. 2 comparative examples one：Metallographic structure after 860 DEG C × 16h oil quenchings, 600 DEG C × 16h oil cooling tempers.
Embodiment
Embodiments of the invention are elaborated below, the present embodiment is carried out lower premised on technical solution of the present invention
Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementations
Example.
Embodiment one
30CrNi2MoV steel forgings are heated to 860 DEG C of insulation 6h, forging is then taken out and carries out oil quenching quenching；It will be quenched through oil quenching
Forging afterwards is heated to 600 DEG C of insulation 16h from room temperature, takes out forging oil cooling to room temperature, then again heats forging from room temperature
To 350 DEG C of insulation 16h, take out forging and be air-cooled to room temperature（Crystallite dimension is as shown in figure 1, more as shown in Figure 2 than comparative example crystallite dimension
It is small）.
30CrNi2MoV steel forgings through being so heat-treated, its low-temperature impact toughness A at -40 DEG CKV(- 40 DEG C) are
43.67J, room temperature tensile intensity RmFor 986.3MPa, room temperature elongation percentage A5For 39.1%.
Comparative example one
30CrNi2MoV steel forgings are heated to 860 DEG C of insulation 6h, forging is then taken out and carries out oil quenching quenching；It will be quenched through oil quenching
Forging afterwards is heated to 600 DEG C of insulation 16h from room temperature, takes out forging oil cooling to room temperature（Crystallite dimension is as shown in Fig. 2 than implementing
Example crystallite dimension is big as shown in Figure 1）.
30CrNi2MoV steel forgings through being so heat-treated, its low-temperature impact toughness A at -40 DEG CKV(- 40 DEG C) are
31.7J, room temperature tensile intensity RmFor 1014.1MPa, room temperature elongation percentage A5For 37.63%.
Part that the present invention does not relate to is same as the prior art or can be realized using prior art.
Claims (4)
1. a kind of double tempering method of raising 30CrNi2MoV steel forgings low-temperature impact toughness, it is characterized in that first by after forging
Steel forgings carry out conventional quenching austenitizing PROCESS FOR TREATMENT, are then cooled to room temperature after conventional tempering process terminates, then enter
Row reheating is to 350 DEG C ~ 580 DEG C and is incubated 16h.
2. according to the method described in claim 1, it is characterized in that the technological parameter of conventional quenching austenitizing processing is 860
DEG C × 6h, cooled down by the way of oil cooling；Described conventional tempering process it is characterized in that tempering process is 600 DEG C × 16h,
Then cooled down using oil cooling mode.
3. the double tempering technique described in claim 1, it is characterized in that：Room temperature is down to after the end of conventional tempering process, is connect
And be heated to 350 DEG C ~ 580 DEG C and be incubated 16h, cooled down using air cooling mode.
4. the double tempering technique described in claim 1, it is characterized in that described reheating optimum temperature is 350 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710630018.3A CN107245555A (en) | 2017-07-28 | 2017-07-28 | Improve the double tempering method of 30CrNi2MoV steel forgings low-temperature impact toughness |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710630018.3A CN107245555A (en) | 2017-07-28 | 2017-07-28 | Improve the double tempering method of 30CrNi2MoV steel forgings low-temperature impact toughness |
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| CN107245555A true CN107245555A (en) | 2017-10-13 |
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| CN201710630018.3A Pending CN107245555A (en) | 2017-07-28 | 2017-07-28 | Improve the double tempering method of 30CrNi2MoV steel forgings low-temperature impact toughness |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107674944A (en) * | 2017-11-19 | 2018-02-09 | 深圳万佳互动科技有限公司 | A kind of hardening and tempering method of splined shaft |
| CN109280851A (en) * | 2018-10-29 | 2019-01-29 | 西宁特殊钢股份有限公司 | Harmonic speed reducer special steel material flexbile gear and its cycle heat treatment method |
| CN113025777A (en) * | 2021-03-02 | 2021-06-25 | 攀钢集团江油长城特殊钢有限公司 | 30CrNi2MoVA large-size forged material and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105567924A (en) * | 2016-03-07 | 2016-05-11 | 江苏大学 | Method for improving tensile strength of Cr-Ni-Mo-V high-hardenability high-strength steel |
-
2017
- 2017-07-28 CN CN201710630018.3A patent/CN107245555A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105567924A (en) * | 2016-03-07 | 2016-05-11 | 江苏大学 | Method for improving tensile strength of Cr-Ni-Mo-V high-hardenability high-strength steel |
Non-Patent Citations (1)
| Title |
|---|
| 陆宝山: "《模具材料与热处理》", 31 January 2016 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107674944A (en) * | 2017-11-19 | 2018-02-09 | 深圳万佳互动科技有限公司 | A kind of hardening and tempering method of splined shaft |
| CN107674944B (en) * | 2017-11-19 | 2019-01-11 | 连云港江南精工机械有限公司 | A kind of hardening and tempering method of splined shaft |
| CN109280851A (en) * | 2018-10-29 | 2019-01-29 | 西宁特殊钢股份有限公司 | Harmonic speed reducer special steel material flexbile gear and its cycle heat treatment method |
| CN113025777A (en) * | 2021-03-02 | 2021-06-25 | 攀钢集团江油长城特殊钢有限公司 | 30CrNi2MoVA large-size forged material and preparation method thereof |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20190121 Address after: 214423 Shashan Avenue 527, Zhouzhuang Town, Jiangyin City, Wuxi City, Jiangsu Province Applicant after: Jiangyin Hengye Forging Co., Ltd. Address before: 212013 No. 301, Xuefu Road, Zhenjiang, Jiangsu Applicant before: Jiangsu University |
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Application publication date: 20171013 |
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| RJ01 | Rejection of invention patent application after publication |