CN108707730A - A kind of mould steel high-efficiency and continuous method for annealing - Google Patents
A kind of mould steel high-efficiency and continuous method for annealing Download PDFInfo
- Publication number
- CN108707730A CN108707730A CN201810605006.XA CN201810605006A CN108707730A CN 108707730 A CN108707730 A CN 108707730A CN 201810605006 A CN201810605006 A CN 201810605006A CN 108707730 A CN108707730 A CN 108707730A
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- mould steel
- annealing
- austenitizing
- continuous
- efficiency
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- 238000000137 annealing Methods 0.000 title claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 38
- 239000010959 steel Substances 0.000 title claims abstract description 38
- 238000011437 continuous method Methods 0.000 title claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 238000004321 preservation Methods 0.000 claims abstract description 9
- 230000036760 body temperature Effects 0.000 claims 3
- 238000000034 method Methods 0.000 abstract description 20
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 210000004185 liver Anatomy 0.000 abstract description 3
- 229910001103 M42 high speed steel Inorganic materials 0.000 description 17
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
Abstract
The present invention discloses a kind of mould steel high-efficiency and continuous method for annealing, includes the following steps：(1) austenitizing：Mould steel is heated to 840~920 DEG C of heat preservations, carries out abundant austenitizing；(2) it is quickly cooled down：The specific temperature section of the mould steel fast cooling to 770~810 DEG C of austenitizing；(3) continuous coo1ing is controlled：After the mould steel temperature of austenitizing reaches 770~810 DEG C, the cooling velocity of 2~5 DEG C/min of control carries out continuous coo1ing；(4) continuous coo1ing is air-cooled to 450~550 DEG C.Compared with existing isothermal annealing and slow cool annealing process, mould steel high-efficiency and continuous annealing process of the invention not only shortens annealing time, improves production efficiency, but also annealed structure is made to refine, and promotes mould steel liver mass.
Description
Technical field
The present invention relates to a kind of mould steel high-efficiency and continuous method for annealing, belong to technical field of metal heat treatment.
Background technology
Mould steel (high-speed steel and mould steel) is because having many advantages, such as high rigidity, high-wearing feature, mainly for the manufacture of high speed
Complicated cutting element, precision die etc. are the important foundation materials of high-end equipment manufacture.By high-carbon high-alloy at setting up separately
Meter, formed in mould steel a large amount of hard, stabilization alloy carbide, there is highly important influence on material property.Pass through
Heat treatment process can regulate and control carbide quantity, size, type and distribution, improve steel hardness, intensity, red hardness, plasticity and toughness
Deng to promote the service life of tool and mould.
Annealing is one of common heat treatment process of mould steel, can improve mould steel processing performance.According to annealing mesh
Difference, there are many mould steel annealing process.After every time cold working of mould steel or hot-working, centre need to be carried out and moved back
Fire heats below austenitizing temperature, eliminates internal machining stress, restorer working ability.Intermediate annealing can not be protected
The organizational requirements for demonstrate,proving mould steel use state usually require to carry out full annealing before tempering of quenching, improve mould steel plasticity,
And carry out tissue preparation for temper of quenching.Full annealing refers to that mould steel is heated to austenitizing transition temperature or more,
And eutectoid reaction occurs in cooling procedure, obtain annealing Soxhlet body tissue.Since mould steel alloying element content is high, Ovshinsky
Body stability is stronger, and cooling improper easily formation martensite or bainite structure, material plasticity deteriorate.
To avoid the above situation, using extremely slow cooling velocity (usually less than 1 DEG C/min) in actual production, or
Using isothermal annealed processes, i.e., a certain temperature (eutectoid) long-time isothermal is down to after austenitizing, to ensure Ovshinsky
Eutectoid reaction fully occurs for body.However, slow cool annealing process and long-time isothermal annealed processes not only make production efficiency reduce, and
And it is easy to cause mould steel microstructure coarsening, it is unfavorable to processing performance and performance.
Therefore, novel mould steel annealing process is developed, while improving production efficiency and liver mass, for high property
Energy mould steel production is of great significance.
Invention content
Goal of the invention：For traditional isothermal annealing or slow cool annealing process low production efficiency, product tissue is ropy asks
Topic, the present invention provide a kind of mould steel high-efficiency and continuous method for annealing.
Technical solution：Mould steel high-efficiency and continuous method for annealing of the present invention, includes the following steps：
(1) austenitizing：Mould steel is heated to 840~920 DEG C of heat preservations, carries out abundant austenitizing；
(2) it is quickly cooled down：The specific temperature section of the mould steel fast cooling to 770~810 DEG C of austenitizing；
(3) continuous coo1ing is controlled：After the mould steel temperature of austenitizing reaches 770~810 DEG C, 2~5 DEG C of control/
The cooling velocity of min carries out continuous coo1ing；
(4) continuous coo1ing is air-cooled to 450~550 DEG C or so.
The specific temperature section and step that austenitizing temperature in above-mentioned steps (1) is reached with rapid cooling in step (2)
(3) the continuous coo1ing speed of the control in has correspondence.Preferably, when in step (1) austenitizing temperature be 840~
At 850 DEG C, the temperature range of fast cooling to 795~810 DEG C in step (2), on this basis, austenitizing temperature often increases
10~20 DEG C, being quickly cooled down the temperature range of arrival reduces by 5~10 DEG C.Further, when in step (1) austenitizing temperature be
At 840~850 DEG C, the continuous coo1ing speed controlled in step (3) is 4.5~5 DEG C/min, on this basis, austenitizing temperature
Degree often increases 10~20 DEG C, and continuous coo1ing speed reduces by 0.5~1 DEG C/min.
Inventive principle：The present invention after 840~920 DEG C of austenitizings by mould steel by being quickly cooled to specific temperature
Section (770~810 DEG C), microstructure coarsening and the improper problem of Carbide Precipitation caused by controllable preparing high-temp is slowly annealed；Reach
After stating specific warm area, control continuous coo1ing speed can shorten the annealing time between 2~5 DEG C/min；Pass through coordinated signals
Austenitizing temperature and cooling velocity control eutectoid reaction behavior and transformation tissue, obtain uniformly tiny spherical annealed structure.
Advantageous effect：Compared with existing isothermal annealing and slow cool annealing process, mould steel high-efficiency and continuous of the invention
Annealing process not only shortens annealing time, improves production efficiency, but also annealed structure is made to refine, and promotes mould steel tissue
Quality.
Description of the drawings
Fig. 1 (a) and 1 (b) are respectively using existing slow cool annealing process and isothermal annealed processes treated M42 steel
Scanning electron microscope (SEM) photograph；
Fig. 2 is the scanning electron microscope (SEM) photograph of the M42 steel after embodiment 1 makes annealing treatment；
Fig. 3 is the scanning electron microscope (SEM) photograph of the M42 steel after embodiment 2 makes annealing treatment；
Fig. 4 is the scanning electron microscope (SEM) photograph of the M42 steel after embodiment 3 makes annealing treatment；
Fig. 5 is the scanning electron microscope (SEM) photograph of the M42 steel after embodiment 4 makes annealing treatment；
Fig. 6 is the scanning electron microscope (SEM) photograph of the M42 steel after embodiment 5 makes annealing treatment；
Fig. 7 is the scanning electron microscope (SEM) photograph of the M42 steel after embodiment 6 makes annealing treatment.
Specific implementation mode
Technical scheme of the present invention is described further below in conjunction with the accompanying drawings.
Embodiment 1
(1) M42 steel is heated to 840 DEG C of heat preservations, abundant austenitizing；
(2) fast cooling is to 795~810 DEG C of warm areas；
(3) with the cooling velocity continuous coo1ing of 5 DEG C/min；
(4) it is furnace-cooled to 500 DEG C or so, it is air-cooled.
Embodiment 2
(1) M42 steel is heated to 855 DEG C of heat preservations, abundant austenitizing；
(2) fast cooling is to 790~805 DEG C of warm areas；
(3) with the cooling velocity continuous coo1ing of 4 DEG C/min；
(4) it is furnace-cooled to 500 DEG C or so, it is air-cooled.
Embodiment 3
(1) M42 steel is heated to 870 DEG C of heat preservations, abundant austenitizing；
(2) fast cooling is to 785~800 DEG C of warm areas；
(3) with the cooling velocity continuous coo1ing of 3.5 DEG C/min；
(4) it is furnace-cooled to 500 DEG C or so, it is air-cooled.
Embodiment 4
(1) M42 steel is heated to 890 DEG C of heat preservations, abundant austenitizing；
(2) fast cooling is to 780~795 DEG C of warm areas；
(3) with the cooling velocity continuous coo1ing of 3 DEG C/min；
(4) it is furnace-cooled to 500 DEG C or so, it is air-cooled.
Embodiment 5
(1) M42 steel is heated to 910 DEG C of heat preservations, abundant austenitizing；
(2) fast cooling is to 775~790 DEG C of warm areas；
(3) with the cooling velocity continuous coo1ing of 2.5 DEG C/min；
(4) it is furnace-cooled to 500 DEG C or so, it is air-cooled.
Embodiment 6
(1) M42 steel is heated to 920 DEG C of heat preservations, abundant austenitizing；
(2) fast cooling is to 770~785 DEG C of warm areas；
(3) with the cooling velocity continuous coo1ing of 2 DEG C/min；
(4) it is furnace-cooled to 500 DEG C or so, it is air-cooled.
Scanning electron microscope (SEM) photograph such as Fig. 2~7 of M42 steel after Examples 1 to 6 annealing, it can be seen that Examples 1 to 6 is equal
Obtain uniformly tiny spherical annealed structure.
As a comparison case, M42 steel is carried out using existing slow cool annealing process and isothermal annealed processes at annealing respectively
Reason, the scanning electron microscope (SEM) photograph of M42 steel such as Fig. 1 (a) and 1 (b) after processing, it can be seen that existing slow cool annealing process or isothermal annealing
M42 steel after process does not obtain tiny spherical annealed structure, and liver mass is significantly worse than Examples 1 to 6, illustrates to use
The continuous annealing method of the present invention not only shortens annealing time, but also annealed structure can be made to refine, and promotes mould steel tissue
Quality.
Claims (3)
1. a kind of mould steel high-efficiency and continuous method for annealing, which is characterized in that include the following steps：
(1) austenitizing：Mould steel is heated to 840~920 DEG C of heat preservations, abundant austenitizing；
(2) it is quickly cooled down：The temperature range of the mould steel fast cooling to 770~810 DEG C of austenitizing；
(3) continuous coo1ing is controlled：The cooling velocity for controlling 2~5 DEG C/min carries out continuous coo1ing；
(4) continuous coo1ing is air-cooled to 450~550 DEG C.
2. mould steel high-efficiency and continuous method for annealing according to claim 1, which is characterized in that when Ovshinsky in step (1)
When body temperature is 840~850 DEG C, the temperature range of fast cooling to 795~810 DEG C in step (2) is on this basis, difficult to understand
Family name's body temperature often increases 10~20 DEG C, is quickly cooled down the temperature range of arrival and reduces by 5~10 DEG C.
3. mould steel high-efficiency and continuous method for annealing according to claim 1, which is characterized in that when Ovshinsky in step (1)
When body temperature is 840~850 DEG C, the continuous coo1ing speed controlled in step (3) is 4.5~5 DEG C/min, on this basis,
Austenitizing temperature often increases 10~20 DEG C, and continuous coo1ing speed reduces by 0.5~1 DEG C/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810605006.XA CN108707730B (en) | 2018-06-13 | 2018-06-13 | Efficient continuous annealing method for tool and die steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810605006.XA CN108707730B (en) | 2018-06-13 | 2018-06-13 | Efficient continuous annealing method for tool and die steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108707730A true CN108707730A (en) | 2018-10-26 |
| CN108707730B CN108707730B (en) | 2020-01-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810605006.XA Active CN108707730B (en) | 2018-06-13 | 2018-06-13 | Efficient continuous annealing method for tool and die steel |
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| Country | Link |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4021272A (en) * | 1974-04-19 | 1977-05-03 | Hitachi Metals, Ltd. | Method of isothermal annealing of band steels for tools and razor blades |
| CN1033846A (en) * | 1988-12-14 | 1989-07-12 | 湖南省冶金材料研究所 | High strength toughness mould steel |
| JPH0820820A (en) * | 1994-07-08 | 1996-01-23 | Sumitomo Metal Ind Ltd | Production of cas hardened steel tube excellent in grain coarsening resistance |
| CN105274437A (en) * | 2015-10-08 | 2016-01-27 | 如皋市宏茂重型锻压有限公司 | Thermal fatigue resisting and high performance hot working die steel and manufacturing process thereof |
| CN109266970A (en) * | 2018-11-28 | 2019-01-25 | 攀钢集团攀枝花钢铁研究院有限公司 | High-nitrogen, high-chromium plastic die steel and its smelting and heat treatment method |
-
2018
- 2018-06-13 CN CN201810605006.XA patent/CN108707730B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4021272A (en) * | 1974-04-19 | 1977-05-03 | Hitachi Metals, Ltd. | Method of isothermal annealing of band steels for tools and razor blades |
| CN1033846A (en) * | 1988-12-14 | 1989-07-12 | 湖南省冶金材料研究所 | High strength toughness mould steel |
| JPH0820820A (en) * | 1994-07-08 | 1996-01-23 | Sumitomo Metal Ind Ltd | Production of cas hardened steel tube excellent in grain coarsening resistance |
| CN105274437A (en) * | 2015-10-08 | 2016-01-27 | 如皋市宏茂重型锻压有限公司 | Thermal fatigue resisting and high performance hot working die steel and manufacturing process thereof |
| CN109266970A (en) * | 2018-11-28 | 2019-01-25 | 攀钢集团攀枝花钢铁研究院有限公司 | High-nitrogen, high-chromium plastic die steel and its smelting and heat treatment method |
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| Publication number | Publication date |
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| CN108707730B (en) | 2020-01-14 |
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Address after: 210088 No.2, Southeast University Road, Jiangning District, Nanjing City, Jiangsu Province Patentee after: SOUTHEAST University Guo jiahuodiqu after: Zhong Guo Patentee after: Jiangsu Tiangong Aihe Technology Co.,Ltd. Address before: 210088 No.2, Southeast University Road, Jiangning District, Nanjing City, Jiangsu Province Patentee before: SOUTHEAST University Guo jiahuodiqu before: Zhong Guo Patentee before: TIANGONG AIHE SPECIAL STEEL Co.,Ltd. |