CN110343818A - A kind of heat treatment method of mould steel - Google Patents
A kind of heat treatment method of mould steel Download PDFInfo
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- CN110343818A CN110343818A CN201810476791.3A CN201810476791A CN110343818A CN 110343818 A CN110343818 A CN 110343818A CN 201810476791 A CN201810476791 A CN 201810476791A CN 110343818 A CN110343818 A CN 110343818A
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- salt bath
- temperature
- furnace
- forging
- heat treatment
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/607—Molten salts
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
- C23C8/38—Treatment of ferrous surfaces
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a kind of heat treatment methods of mould steel, comprising the following steps: annealing process, quenching technical, tempering process, salt bath process and Plasma Sulfo-nitriding technique.The present invention is by optimizing adjustment to mold steel heat treatment process, effectively improve the hardness, toughness and its wearability of mould steel, furthermore, mould steel is after Plasma Sulfo-nitriding is handled, the wearability and seizure resistance of type chamber are improved significantly, and 2 ~ 4 times are improved when die life ratio is without permeation, the surface brightness of product is also significantly improved, the service life for extending compression mod, improves economic benefit.
Description
Technical field
The present invention relates to the heat treatment process field of material, specially a kind of heat treatment method of mould steel.
Background technique
Compression mod is widely applied in the industrial production, and aluminum alloy part is in compression mod forming process, when the aluminium of melting closes
When golden liquid is pressed into type chamber, the surface temperature of type chamber is up to 600 DEG C or so.Aluminum alloy melt is adhered on type chamber and type in order to prevent
Chamber temperature is excessively high, and when work must continually smear release coating to mold cavity, thereby results in mold cavity surface temperature repeatedly
Lifting.To ensure its good thermal conductivity and thermal fatigue resistance, generallys use 3Cr2W8V compression mod and aluminum alloy part is pressed
Shape is cast, but it is existing to be usually present sticking to mould, erosion, heat fatigue, abrasion etc. due to its shaping characteristic for aluminum alloy part compression mod
As.It is more to influence the factor that compression mod uses, such as the structure of die casting, mold materials and heat treatment, the structure and system of compression mod
Make technique, selection of die-casting technological parameter etc..
Heat treatment can change the metallographic structure of material, guarantee the ruler under the necessary strength and stiffness of mould parts, high temperature
Very little stability, thermal fatigue resistance and cutting ability of material etc. play the service life of 3Cr2W8V compression mod extremely important
Effect, therefore, correct heat treatment process be improve 3Cr2W8V Die-casting Die Life a key.Therefore, in order to mention
The fracture toughness and wearability of high forging die are badly in need of developing a kind of new heat treatment process to extend the service life of mold.For
Above situation, the patent application of Publication No. CN201410723688.6, CN201210264588.2, CN201010148982.0
It is proposed the heat treatment method for different mould steel, but above method specific aim is stronger, effect is not highly desirable.
Summary of the invention
The present invention is undesirable for compression mod thermal effectiveness in the prior art, the short problem of die life, proposes
A kind of heat treatment method of mould steel, can effectively extend the service life of forging die.
To achieve the goals above, the present invention provides a kind of heat treatment methods of mould steel, comprising the following steps: annealing
Technique, quenching technical, tempering process, salt bath process and Plasma Sulfo-nitriding technique.
(1) annealing process
Forging is installed in batch-type furnace and is heated to 800 ~ 850 DEG C, 140 ~ 150min is kept the temperature, cools to 730 ~ 750 DEG C with the furnace again
160 ~ 180min is kept the temperature, 480 ~ 500 DEG C is cooled to the speed limit of 30 DEG C/h, then be warming up to 550 DEG C of progress dehydrogenations, then goes out
Furnace is air-cooled to room temperature.
(2) quenching technical
It prepares the salt bath furnace of three different temperatures in advance, is 550 ~ 600 DEG C of classification salt bath furnace, thermohaline in 850 ~ 900 DEG C respectively
Liquid furnace, 1130 ~ 1450 DEG C of High Temperature Salt Bath Furnace.Forging is first placed in classification salt bath furnace and preheats 20 ~ 25min, then turned rapidly
Enter in medium temperature salt bath furnace and preheat 15 ~ 18min again, then continues at 10 ~ 12min of heat preservation in High Temperature Salt Bath Furnace, take out investment 550 ~ 600
DEG C classification salt bath furnace in cooled down, the residence time be 16 ~ 20min, after internal and external temperature is consistent, taking-up be put into preparatory heating
Continue to cool down into 260 ~ 280 DEG C of melting salt made from earth containing a comparatively high percentage of sodium chloride, the residence time is 20 ~ 25min, is taken out air-cooled.
The ingredient of the salt bath of the classification salt bath furnace are as follows: NaCl, BaCl2、CaCl2, mass fraction is respectively as follows: 21%,
31%, 48%.
The ingredient of the salt bath of the medium temperature salt bath furnace are as follows: BaCl2, KCl, mass fraction is respectively as follows: 50%, 50%.
The ingredient of the salt bath of the High Temperature Salt Bath Furnace is 100%BaCl2。
The ingredient of the melting salt made from earth containing a comparatively high percentage of sodium chloride are as follows: NaNO3、KNO3, mass fraction is respectively as follows: 45%, 55%.
(3) tempering process
Quenched forging is placed in batch-type furnace and carries out high tempering twice, first time tempering heating-up temperature is 180 ~ 220 DEG C,
Soaking time is 90 ~ 100min, cooling with oil, is tempered followed by second, and heating temperature is 160 ~ 200 DEG C, when heat preservation
Between 0.8 ~ 1h.
(4) salt bath process
It is after keeping the temperature 1.5 ~ 3h at 530 ~ 600 DEG C, 380 ~ 400 that the forging of tempering after finishing, which is placed in nitrocarburizing temperature,
DEG C oxidizing temperature keeps the temperature 20 ~ 30min.
(5) Plasma Sulfo-nitriding technique
Forging, which is placed on, is heated to 550 ~ 580 DEG C of ionic nitriding furnace apparatus, and the ratio between diffusion medium volume fraction is SO2: NH3: second
Alcohol=1:8:1, vacuum degree are 260 ~ 400Pa, and the permeation time is 1.8 ~ 2h.
The present invention effectively improves 3Cr2W8V Bi-metal Steel Aluminum pressure by optimizing adjustment to mold steel heat treatment process
Hardness, toughness and its wearability of mold, in addition, 3Cr2W8V Steel Aluminum Die-casting Dies are after Plasma Sulfo-nitriding is handled, type chamber
Wearability and seizure resistance be improved significantly, when die life ratio is without permeation improve 2 ~ 4 times, the surface brightness of product
Also it is significantly improved, extends the service life of compression mod, improve economic benefit.
Specific embodiment
The technical scheme of the invention is further explained by means of specific implementation, but is not limited to following implementation
Example.
A kind of heat treatment method of mould steel, comprising the following steps: annealing process, quenching technical, tempering process, salt bath work
Skill and Plasma Sulfo-nitriding technique.
(1) annealing process
Forging is installed in batch-type furnace and is heated to 850 DEG C, 150min is kept the temperature, cools to 730 DEG C with the furnace and keep the temperature 180min again, with
The speed limit of 30 DEG C/h is cooled to 490 DEG C, then is warming up to 550 DEG C of progress dehydrogenations, then comes out of the stove and is air-cooled to room temperature, isothermal annealing
The hardness of forging is 220 ~ 250HBS afterwards.
(2) quenching technical
It prepares the salt bath furnace of three different temperatures in advance, is 550 DEG C of classification salt bath furnace respectively, 850 DEG C of medium temperature salt bath furnaces, 1130
DEG C High Temperature Salt Bath Furnace.Forging is first placed in classification salt bath furnace and preheats 25min, is then transferred to rapidly in medium temperature salt bath furnace again pre-
Hot 18min is then continued at and is kept the temperature 12min in High Temperature Salt Bath Furnace, is taken out in the classification salt bath furnace for put into 560 DEG C and is cooled down, is stopped
Staying the time is 16min, and after internal and external temperature is consistent, taking-up, which is put into the melting salt made from earth containing a comparatively high percentage of sodium chloride for be previously heated to 260 DEG C, to be continued to cool down, and is stopped
Staying the time is 20min, and taking-up is air-cooled, and hardness is 50 ~ 55HRC after quenching.
The ingredient of the salt bath of the classification salt bath furnace are as follows: NaCl, BaCl2、CaCl2, mass fraction is respectively as follows: 21%,
31%, 48%.
The ingredient of the salt bath of the medium temperature salt bath furnace are as follows: BaCl2, KCl, mass fraction is respectively as follows: 50%, 50%.
The ingredient of the salt bath of the High Temperature Salt Bath Furnace is 100%BaCl2。
The ingredient of the melting salt made from earth containing a comparatively high percentage of sodium chloride are as follows: NaNO3、KNO3, mass fraction is respectively as follows: 45%, 55%.
(3) tempering process
Quenched forging is placed in batch-type furnace and carries out high tempering twice, first time tempering heating-up temperature is 200 DEG C, heat preservation
Time is 90min, cooling with oil, is tempered followed by second, and heating temperature is 180 DEG C, soaking time 1h, hard after tempering
Degree is 44 ~ 46 HRC.
(4) salt bath process
The forging of tempering after finishing is placed under nitrocarburizing temperature is 550 after heat preservation 2h, is 390 DEG C of guarantors in oxidizing temperature
Warm 20min.
(4) Plasma Sulfo-nitriding technique
Forging, which is placed on, is heated to 550 DEG C of ionic nitriding furnace apparatus, and the ratio between diffusion medium volume fraction is SO2: NH3: ethyl alcohol=
1:8:1, vacuum degree 350Pa, permeation time 2h, nitrided layer hardness are higher than 1000HV.
The present embodiment effectively improves mould steel by optimizing adjustment to 3Cr2W8V mold steel heat treatment process
Hardness, toughness and its wearability, in addition, handling rear mold steel through Plasma Sulfo-nitriding, the wearability and seizure resistance of type chamber are obtained
To significantly improving, 2 ~ 4 times are improved when die life ratio is without permeation, the surface brightness of product is also significantly improved.
The above, only specific embodiments of the present invention cannot be limited the scope of implementation of the present invention with it, so its etc.
With the displacement of component, or according to equivalent variations made by the invention patent protection scope and modification, it should all still fall within the present invention and cover
Scope.
Claims (3)
1. a kind of heat treatment method of mould steel, comprising the following steps: annealing process, quenching technical, tempering process, salt bath process
With Plasma Sulfo-nitriding technique；It is characterized in that, the annealing process be forging is installed in batch-type furnace be heated to 800 ~
850 DEG C, 140 ~ 150min is kept the temperature, 730 ~ 750 DEG C is cooled to the furnace and keeps the temperature 160 ~ 180min again, be cooled to the speed limit of 30 DEG C/h
480 ~ 500 DEG C, then 550 DEG C of progress dehydrogenations are warming up to, it then comes out of the stove and is air-cooled to room temperature；
The quenching technical is the salt bath furnace for preparing three different temperatures in advance, is 550 ~ 600 DEG C of classification salt bath furnace respectively,
850 ~ 900 DEG C of medium temperature salt bath furnaces, 1130 ~ 1450 DEG C of High Temperature Salt Bath Furnace, by forging first be placed in classification salt bath furnace in preheating 20 ~
Then 25min is transferred to rapidly in medium temperature salt bath furnace and preheats 15 ~ 18min again, then continue in High Temperature Salt Bath Furnace heat preservation 10 ~
12min takes out in the classification salt bath furnace for put into 550 ~ 600 DEG C and is cooled down, and the residence time is 16 ~ 20min, to warm inside and outside forging
After degree is consistent, taking-up, which is put into the melting salt made from earth containing a comparatively high percentage of sodium chloride for be previously heated to 260 ~ 280 DEG C, to be continued to cool down, and the residence time is 20 ~ 25min,
It is air-cooled to take out forging progress；
The ingredient of the salt bath of the classification salt bath furnace are as follows: NaCl, BaCl2、CaCl2, mass fraction is respectively as follows: 21%, 31% and
48%；
The ingredient of the salt bath of the medium temperature salt bath furnace are as follows: BaCl2, KCl, mass fraction is respectively as follows: 50% and 50%；
The ingredient of the salt bath of the High Temperature Salt Bath Furnace is 100%BaCl2；
The ingredient of the melting salt made from earth containing a comparatively high percentage of sodium chloride are as follows: NaNO3、KNO3, mass fraction is respectively as follows: 45% and 55%；
The salt bath process be by finishing after tempering forging be placed in nitrocarburizing temperature be 530 ~ 600 DEG C at heat preservation 1.5 ~
After 3h, 20 ~ 30min is kept the temperature in 380 ~ 400 DEG C of oxidizing temperatures.
2. the heat treatment method of hot-forging die according to claim 1, which is characterized in that the tempering process is will to quench
Forging afterwards, which is placed in batch-type furnace, carries out high tempering twice, and first time tempering heating-up temperature is 180 ~ 220 DEG C, and soaking time is
90 ~ 100min, it is cooling with oil, it is tempered followed by second, heating temperature is 160 ~ 200 DEG C, 0.8 ~ 1h of soaking time.
3. the heat treatment method of hot-forging die according to claim 2, which is characterized in that the Plasma Sulfo-nitriding technique
It is to be placed on forging to be heated to 550 ~ 580 DEG C of ionic nitriding furnace apparatus, the ratio between diffusion medium volume fraction is SO2: NH3: ethyl alcohol
=1:8:1, vacuum degree are 260 ~ 400Pa, and the permeation time is 1.8 ~ 2h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810476791.3A CN110343818A (en) | 2018-05-18 | 2018-05-18 | A kind of heat treatment method of mould steel |
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| CN201810476791.3A CN110343818A (en) | 2018-05-18 | 2018-05-18 | A kind of heat treatment method of mould steel |
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| CN110343818A true CN110343818A (en) | 2019-10-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112921325A (en) * | 2020-12-25 | 2021-06-08 | 苏州奥维精密机械有限公司 | High-stability die steel surface composite double-treatment process |
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2018
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Patent Citations (3)
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|---|---|---|---|---|
| CN102230062A (en) * | 2011-06-10 | 2011-11-02 | 西南交通大学 | Heat treatment process for improving strength and toughness of 9SiCr die steel |
| CN105364433A (en) * | 2015-11-27 | 2016-03-02 | 昆山惠众机电有限公司 | Hot-working die production technology |
| CN107904510A (en) * | 2017-11-21 | 2018-04-13 | 重庆文理学院 | Comprehensive high performance hot die steel of one kind and preparation method thereof |
Non-Patent Citations (3)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112921325A (en) * | 2020-12-25 | 2021-06-08 | 苏州奥维精密机械有限公司 | High-stability die steel surface composite double-treatment process |
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