CN108823371A - A kind of heat treatment method of 5CrNiMo hot-forging die - Google Patents
A kind of heat treatment method of 5CrNiMo hot-forging die Download PDFInfo
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- CN108823371A CN108823371A CN201810491554.4A CN201810491554A CN108823371A CN 108823371 A CN108823371 A CN 108823371A CN 201810491554 A CN201810491554 A CN 201810491554A CN 108823371 A CN108823371 A CN 108823371A
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- forging die
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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
- C21D1/26—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
- C21D1/18—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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C23C8/40—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 liquids, e.g. salt baths, liquid suspensions
- C23C8/52—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 liquids, e.g. salt baths, liquid suspensions more than one element being applied in one step
- C23C8/54—Carbo-nitriding
- C23C8/56—Carbo-nitriding of ferrous surfaces
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
- Forging (AREA)
Abstract
The invention discloses a kind of heat treatment methods of 5CrNiMo hot-forging die, include the following steps：Isothermal annealing, quenching, tempering and salt bath.The present invention effectively improves the hardness, toughness and its wearability of 5CrNiMo hot-forging die, extends the service life of forging die by being heat-treated to 5CrNiMo hot-forging die.
Description
Technical field
The present invention relates to the heat treatment process field of material, specially a kind of heat treatment method of 5CrNiMo hot-forging die.
Background technique
In the industrial production, hot-forging die stress Nature comparison is complicated, is primarily subjected to impact force, pressure and multinomial tension and compression and answers
Power, furthermore also subject to the rubbing action of heating, cooling and fierceness repeatedly.Hot-forging die is typically due to type chamber serious wear, type chamber
Die wall fracture, surface heat fatigue cracking and crack in dovetail keyway and fail.For this purpose, hot-forging die will not only have high obdurability, also need
There are higher elevated temperature strength, heat-resistant anti-fatigue and wear-resisting property.Most common material is 5CrNiMo in hot-forging die.Due to
5CrNiMo hot-forging die can bear huge impact load in the work environment, heated and can be caused not repeatedly in cooling procedure
Uniform thermal stress and thermal strain, while bearing to flow the friction of red-hot metal and mold cavity surface, therefore its service life is shorter,
Often generate burst apart, collapse, wearing, the failure phenomenons such as heat fatigue.Studies have shown that it is the toughness for leading to hot-forging die that heat treatment is improper
The main reason for insufficient.The thermal stability and intensity of the 5CrNiMo steel of normative heat treatment are lower, are not able to satisfy large pressing machine mould
Have the requirements at the higher level to performance, often fails because thermal wear and hot tearing are serious in use.Therefore, in order to which the fracture for improving forging die is tough
Property and wearability be badly in need of developing a kind of new heat treatment process to extend the service life of mold.It is open for above situation
Number be CN201410723688.6, the patent application of CN201210264588.2, CN201010148982.0, which are proposed, to be directed to
The heat treatment method of 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 hot-forging die thermal effectiveness in the prior art, the short problem of die life, proposes
A kind of heat treatment method of 5CrNiMo hot-forging die, 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 5CrNiMo hot-forging die, including following step
Suddenly：
(1) forging blank is placed in batch-type furnace by isothermal annealing, with stove heating, heats up too fast cause stress in order to prevent
Excessive, heating rate answers≤25 DEG C/h, is heated to 750~800 DEG C, keeps the temperature 130~150min, then has a power failure and cools to the furnace
680 DEG C, then about 4h is kept the temperature, have a power failure cool to 500 DEG C or so with the furnace again, comes out of the stove air-cooled.
(2) it quenches, resistance furnace is warming up to 650 DEG C in advance, and empty furnace keeps the temperature 30~50min, and in-furnace temperature is made to reach equal
It is even, then hot-forging die is warming up to 850 DEG C with furnace, keeps the temperature 380~500min, come out of the stove and be cooled in advance in air loaded in resistance furnace
780 DEG C, the brine-cooled of 0~10% mass fraction is immersed, brine temp is 30~70 DEG C, and t cooling time presses formula t=V/S
(min) it calculates, in formula, V is mould volume, mm3；S is mold outer surface area, mm2, forbid hot-forging die to be air-cooled to room temperature and return again
Fire, it is otherwise easy to crack.
(3) it is tempered, quenched hammer forging die is placed in batch-type furnace and is heated to 490~600 DEG C, after keeping the temperature 50~150min
Come out of the stove, immerse oil be cooled to 150~200 DEG C it is fuel-displaced air-cooled, be cooled to room temperature.
(4) salt bath, by the hammer forging die after tempering be placed in nitrocarburizing temperature be 550~580 DEG C at keep the temperature 1.5~5h after,
Salt bath cyanate radical CNO-Content guarantee 34~38%, be 390~440 DEG C of 20~30min of heat preservation in oxidizing temperature.
The present invention effectively improves 5CrNiMo forging by simply being adjusted to 5CrNiMo Heat Treatment Process of Forging
Hardness, toughness and its wearability of mould avoid mold generation from bursting apart, collapse, wearing, the failure phenomenons such as heat fatigue, extend forging
The service life of mould, improves 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 5CrNiMo hot-forging die, includes the following steps：
(1) forging blank is placed in batch-type furnace by isothermal annealing, with stove heating, heats up too fast cause stress in order to prevent
Excessive, heating rate is 25 DEG C/h, is heated to 780 DEG C, keeps the temperature 140min, then has a power failure and cools to 680 DEG C with the furnace, then keeps the temperature about
4h has a power failure cool to 500 DEG C or so with the furnace again, comes out of the stove air-cooled, and hardness is 200~240HBS after annealing.
(2) it quenches, resistance furnace is warming up to 650 DEG C in advance, and empty furnace keeps the temperature 40min, reaches in-furnace temperature uniformly, then
By hot-forging die loaded in resistance furnace, 850 DEG C are warming up to furnace, keeps the temperature 400min, comes out of the stove and is cooled to 780 DEG C in advance in air, is immersed
The brine-cooled of 10% mass fraction, brine temp are 50 DEG C, and t cooling time is calculated by formula t=V/S (min), and in formula, V is
Mould volume, unit mm3；S is mold outer surface area, unit mm2, V is 10000mm in the present embodiment3, the present embodiment
Middle S is 200mm2, so oily cool time is 50min, forbids hot-forging die to be air-cooled to room temperature and be tempered again, it is otherwise easy to crack.
(3) it is tempered, quenched hammer forging die is placed in batch-type furnace and is heated to 500 DEG C, it is cold to go out furnace oil after heat preservation 100min
It is fuel-displaced air-cooled to 180 DEG C, it is cooled to room temperature, temper number is 37~45HBS.
(4) salt bath, it is salt bath cyanate radical after keeping the temperature 3h at 570 DEG C that the hammer forging die after tempering, which is placed in nitrocarburizing temperature,
CNO-Content be 38%, oxidizing temperature be 400 DEG C of heat preservation 25min.
The present embodiment effectively improves 5CrNiMo by simply being adjusted to 5CrNiMo Heat Treatment Process of Forging
Hardness, toughness and its wearability of hot-forging die.
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 (4)
1. a kind of heat treatment method of 5CrNiMo hot-forging die, which is characterized in that include the following steps：Isothermal annealing, is returned at quenching
The step of fire and salt bath, the isothermal annealing, for forging blank to be placed in batch-type furnace, with stove heating, heats up too fast in order to prevent
Cause stress excessive, heating rate answers≤25 DEG C/h, is heated to 750~800 DEG C, keeps the temperature 130~150min, then has a power failure with furnace
680 DEG C are cooled to, then keeps the temperature about 4h, has a power failure cool to 500 DEG C or so with the furnace again, come out of the stove air-cooled；
Resistance furnace is is warming up to 650 DEG C in advance by the quenching, and empty furnace keeps the temperature 30~50min, reaches in-furnace temperature uniformly,
Hot-forging die is warming up to 850 DEG C with furnace, keeps the temperature 380~500min, come out of the stove and be cooled to 780 in advance in air loaded in resistance furnace again
DEG C, the brine-cooled of 0~10% mass fraction is immersed, brine temp is 30~70 DEG C, and cooling time, t was according to mould volume and mould
Have exterior surface area to determine；
The salt bath be by tempering after hammer forging die be placed in nitrocarburizing temperature be at 550~580 DEG C keep the temperature 1.5~5h after, salt
Bathe cyanate radical CNO-Content guarantee 34~38%, be 390~440 DEG C of 20~30min of heat preservation in oxidizing temperature.
2. the heat treatment method of hot-forging die according to claim 1, which is characterized in that t cooling time in the quenching
It is calculated by formula t=V/S (min), in formula, V is mould volume, unit mm3；S is mold outer surface area, unit mm2。
3. the heat treatment method of hot-forging die according to claim 1, which is characterized in that the tempering is by quenched hammer
Forging die, which is placed in batch-type furnace, is heated to 490~600 DEG C, goes out furnace oil after 50~150min of heat preservation and is cooled to 150~200 DEG C of fuel-displaced skies
It is cold, it is cooled to room temperature.
4. the heat treatment method of hot-forging die according to claim 1, which is characterized in that during the quenching, forbid
Hot-forging die is air-cooled to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810491554.4A CN108823371A (en) | 2018-05-21 | 2018-05-21 | A kind of heat treatment method of 5CrNiMo hot-forging die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810491554.4A CN108823371A (en) | 2018-05-21 | 2018-05-21 | A kind of heat treatment method of 5CrNiMo hot-forging die |
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| CN108823371A true CN108823371A (en) | 2018-11-16 |
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| CN201810491554.4A Pending CN108823371A (en) | 2018-05-21 | 2018-05-21 | A kind of heat treatment method of 5CrNiMo hot-forging die |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498685A (en) * | 2014-12-09 | 2015-04-08 | 通裕重工股份有限公司 | Heat-treating process for hot-working die steel forgings |
| CN105349940A (en) * | 2015-11-27 | 2016-02-24 | 陕西东铭车辆***股份有限公司 | Carburizing and carbonitriding combined heat treatment method for hot forging marking die steel |
| CN106191760A (en) * | 2016-08-31 | 2016-12-07 | 山东温岭精锻科技有限公司 | 5CrNiMo mould carbon nitrogen sulphur common seeping Technology for Heating Processing |
| CN106755760A (en) * | 2015-11-20 | 2017-05-31 | 巴南区伟鹏机械加工厂 | A kind of 5CrNiMo steel hammers forging die quenching technical |
-
2018
- 2018-05-21 CN CN201810491554.4A patent/CN108823371A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498685A (en) * | 2014-12-09 | 2015-04-08 | 通裕重工股份有限公司 | Heat-treating process for hot-working die steel forgings |
| CN106755760A (en) * | 2015-11-20 | 2017-05-31 | 巴南区伟鹏机械加工厂 | A kind of 5CrNiMo steel hammers forging die quenching technical |
| CN105349940A (en) * | 2015-11-27 | 2016-02-24 | 陕西东铭车辆***股份有限公司 | Carburizing and carbonitriding combined heat treatment method for hot forging marking die steel |
| CN106191760A (en) * | 2016-08-31 | 2016-12-07 | 山东温岭精锻科技有限公司 | 5CrNiMo mould carbon nitrogen sulphur common seeping Technology for Heating Processing |
Non-Patent Citations (1)
| Title |
|---|
| 刘海鑫: "热作模具钢5CrNiMo的热处理及氮碳共渗", 《机械工程师》 * |
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