CN109321868A - A kind of heat treatment process of high abrasion round-link chain - Google Patents
A kind of heat treatment process of high abrasion round-link chain Download PDFInfo
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- CN109321868A CN109321868A CN201811494850.6A CN201811494850A CN109321868A CN 109321868 A CN109321868 A CN 109321868A CN 201811494850 A CN201811494850 A CN 201811494850A CN 109321868 A CN109321868 A CN 109321868A
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- 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
- C23C8/08—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 only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
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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
-
- 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
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D9/0087—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for chains, for chain links
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G13/00—Chains
- F16G13/12—Hauling- or hoisting-chains so called ornamental chains
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses round-link chain heat treatment methods and the round-link chain handled by this method.Wherein, to include: (1) carry out Carburization Treatment for round-link chain to be processed to the round-link chain heat treatment method under the first treatment temperature, and the Carburization Treatment includes strong seeping stage and diffusion phase；(2) step (1) products obtained therefrom is subjected at a temperature of second processing carburizing and quenching processing, obtains carburizing and quenching product；(3) the carburizing and quenching product is subjected to the first tempering and air-cooled, obtains the first tempered product；(4) first tempered product is subjected to the second tempering and air-cooled, obtains round-link chain product.The round-link chain heat treatment method is remarkably improved the wearability and corrosion resistance of round-link chain product, and production efficiency and quality product rate are high by optimizing to carburizing and tempering process.
Description
Technical field
The present invention relates to mechanical processing technique fields, in particular to round-link chain heat treatment method and pass through this method
Handle obtained round-link chain.
Background technique
Round-link chain is the key that all kinds of mechanical equipment easily worn parts, and demand is big, and technical requirements are high, it is necessary to have high-strength
Degree, high-wearing feature and good extension property.With the fast development of Chinese economy, mechanization degree is higher and higher, industry
Production safety and production automation are increasingly taken seriously and popularize, and to the quality of annular chains, more stringent requirements are proposed.
Round-link chain is played a crucial role in the lifting in the fields such as mining, ship and thermal power generation, lifting and fishing slag,
It is divided according to different standards with credit rating, circle chain of mine can be divided into B, C, D grades.It is flourishing with China's thermoelectricity cause
Development, boiler and Transport Machinery are continuously improved, and to the quality and variety of round-link chain, more stringent requirements are proposed, heavy caliber, height
Intensity, wear-resisting and corrosion resistant fishing slag chain are concerned.The use environment for fishing out slag chain is more harsh, chain master in the market
If minor diameter chain, fishing slag chain of the diameter in 30mm or more relies on import mostly.
While the generally existing some quality problems of fishing slag round-link chain product in China: easily there is cracking, size in chain link weld bond
Phenomena such as pitch is unstable and service life is short.It is domestic at present for the heat treatment process of annular chains be mainly continuous quenching and
The mode of tempering, but it is insufficient due to recognizing for martensite heat treatment temper brittleness, cause chain often to occur chain in use
The disabled status such as item fracture.Thus, existing round-link chain still has much room for improvement.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is the round-link chain for proposing round-link chain heat treatment method and handling by this method.The round-link chain heat treatment side
Method is remarkably improved the wearability and corrosion resistance of round-link chain product, and produce effect by optimizing to carburizing and tempering process
Rate and quality product rate are high.
In one aspect of the invention, the invention proposes a kind of round-link chain heat treatment methods.Implementation according to the present invention
Example, which includes: that round-link chain to be processed is carried out Carburization Treatment by (1) under the first treatment temperature, described
Carburization Treatment includes strong infiltration stage and diffusion phase；(2) step (1) products obtained therefrom is carried out to carburizing to quench at a temperature of second processing
Fire processing, obtains carburizing and quenching product；(3) the carburizing and quenching product is subjected to the first tempering and air-cooled, obtains first
Tempered product；(4) first tempered product is subjected to the second tempering and air-cooled, obtains round-link chain product.
Round-link chain heat treatment method according to an embodiment of the present invention, first by different treatment temperature and car-burization condition
Under carry out carburizing to workpiece to be handled, workpiece surface formed carburized layer.Carburizing product carries out first time tempering after being quenched, empty
Second of tempering is carried out after cold again, influence of the temper brittleness to properties of product can be effectively reduced, and reduce chain grinding crack
Generation, to significantly improve the wearability and corrosion resistance of product, the cracking for avoiding round-link chain from easily occurring in use, size section
Generation away from the problems such as unstable, service life is short.Meanwhile round-link chain heat treatment method simple process of the invention, production effect
Rate is high, and quality product rate is high.
In addition, round-link chain heat treatment method according to the above embodiment of the present invention can also have following additional technology special
Sign:
In some embodiments of the invention, first treatment temperature is 920~930 DEG C.
In some embodiments of the invention, the strong infiltration stage includes first stage and second stage, first rank
Duan Zhong, carbon potential is 1.0~1.1%, and the time that the first stage carries out is 7.75~8.25h.
In some embodiments of the invention, in the second stage, carbon potential be 0.9~1.0%, the second stage into
The capable time is 6.75~7.25h.
In some embodiments of the invention, in the diffusion phase, carbon potential be 0.7~0.8%, the diffusion phase into
The capable time is 6.75~7.25h.
In some embodiments of the invention, the second processing temperature is 810~830 DEG C.
In some embodiments of the invention, in carburizing and quenching processing, first at a temperature of the second processing with
The condition that carbon potential is 0.7~0.8% carries out 0.75~1.25h of Deep Carburization Process, then is quenched.
In some embodiments of the invention, first tempering be at 220~240 DEG C carry out 2.75~
3.25h completing.
In some embodiments of the invention, second tempering be at 180~200 DEG C carry out 2.75~
3.25h completing.
In some embodiments of the invention, the round-link chain to be processed is formed by steel alloy, and the steel alloy includes:
The Mn of the Si of the C of 0.14~0.19wt%, 0.15~0.4wt%, 0.4~0.6wt% are not higher than 0.035wt%
S, the P not higher than 0.035%, the Ni of the Cr of 1.50~1.80wt%, 1.40~1.70wt%, 0.25~0.35wt%'s
The Fe of Mo and surplus.
In another aspect of this invention, the invention proposes a kind of round-link chains.According to an embodiment of the invention, the round-link chain
It is to be handled using the round-link chain heat treatment method of above-described embodiment.Round-link chain phase according to an embodiment of the present invention as a result,
For existing round-link chain have higher wearability and corrosion resistance, be less prone in use cracking, size pitch it is unstable,
The problems such as service life is short, and have the advantages that simple production process, high production efficiency, quality product rate are high.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the flow diagram of round-link chain heat treatment method according to an embodiment of the invention；
Fig. 2 is carburizing and quenching treatment process curve graph according to an embodiment of the invention；
Fig. 3 is tempering process curve figure according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail.The embodiments described below is exemplary, and is only used for explaining this hair
It is bright, and be not considered as limiting the invention.Particular technique or condition are not specified in embodiment, according to text in the art
It offers described technology or conditions or is carried out according to product description.Reagents or instruments used without specified manufacturer,
For can be with conventional products that are commercially available.
Inventor has found that the fishing slag round-link chain product in China is generally deposited in the research to round-link chain and its heat treatment process
In some quality problems: easily there is phenomena such as cracking, size pitch is unstable and service life is short in chain link weld bond.It is domestic right at present
In the mode that the heat treatment process of annular chains is mainly continuous quenching and tempering, but due to for martensite heat treatment Temper brittleness
Property understanding it is insufficient, cause chain often to occur the disabled status such as chain breakage in use.
In consideration of it, in one aspect of the invention.The invention proposes a kind of round-link chain heat treatment methods.According to the present invention
Embodiment, this method comprises: round-link chain to be processed is carried out Carburization Treatment, Carburization Treatment packet by (1) under the first treatment temperature
Include strong infiltration stage and diffusion phase；(2) step (1) products obtained therefrom is subjected at a temperature of second processing carburizing and quenching processing, obtained
To carburizing and quenching product；(3) carburizing and quenching product is subjected to the first tempering and air-cooled, obtains the first tempered product；(4) will
First tempered product carries out the second tempering and air-cooled, obtains round-link chain product.
Round-link chain heat treatment method according to an embodiment of the present invention, first by different treatment temperature and car-burization condition
Under carry out carburizing to workpiece to be handled, workpiece surface formed carburized layer.Carburizing product carries out first time tempering after being quenched, empty
Second of tempering is carried out after cold again, influence of the temper brittleness to properties of product can be effectively reduced, and reduce chain grinding crack
Generation, to significantly improve the wearability and corrosion resistance of product, the cracking for avoiding round-link chain from easily occurring in use, size section
Generation away from the problems such as unstable, service life is short.Meanwhile round-link chain heat treatment method simple process of the invention, production effect
Rate is high, and quality product rate is high.
Round-link chain heat treatment method according to an embodiment of the present invention is described in detail below with reference to Fig. 1.According to this hair
Bright embodiment, the round-link chain heat treatment method include:
S100: carburizing process
In the step, round-link chain to be processed is successively carried out to strong infiltration stage and the diffusion rank of carburizing under the first treatment temperature
Section.
According to an embodiment of the invention, the first treatment temperature can be 920~930 DEG C.By treating place at such a temperature
Science and engineering part carries out carburizing, and carburizing process is divided into strong infiltration stage and diffusion phase.
According to an embodiment of the invention, carbon potential is 1.0~1.1%, first stage carburizing seeping in first stage processing by force
The processing time of processing is 7.75~8.25h.First using higher carbon potential (Cp=1.0~1.1%) to workpiece to be handled into
480 ± 15min of row Carburization Treatment.
According to an embodiment of the invention, carbon potential is 0.9~1.0%, second stage carburizing in seeping second stage processing by force
The processing time of processing is 6.75~7.25h.Maintain the first treatment temperature constant, using relatively low carbon potential (Cp=0.9~
1.0%) continue to carry out 420 ± 15min of Carburization Treatment to workpiece to be handled.By seeping the processing in stage by force, chain surface carbon contains
Amount improves, and then carbide concentration improves, and progressivelyes reach required carburized (case) depth.
According to an embodiment of the invention, diffusion phase processing in, carbon potential be 0.7~0.8%, processing the time be 6.75~
7.25h.It maintains the first treatment temperature constant, further decreases carbon potential to the continuation of Cp=0.7~0.8% and carry out to workpiece to be handled
420 ± 15min of Carburization Treatment, diffusion phase can prevent carbide surface excessive concentration, determine the carbon content on chain surface, have
Conducive to next quenching.
According to some embodiments of the present invention, Carburization Treatment can carry out in DC02 controllable atmosphere box-type multipurpose furnace.
S200: hardening phase
In the step, S100 products obtained therefrom is subjected to carburizing and quenching processing at a temperature of second processing, obtains carburizing and quenching
Product.Workpiece to be processed is adjusted to second processing temperature, and quenched by carburizing after the processing of too strong infiltration stage and diffusion phase
Fire obtains required product.
According to an embodiment of the invention, second processing temperature can be 810~830 DEG C.By at such a temperature to process
The strong workpiece further progress carburizing and quenching processing for seeping stage and diffusion phase.
According to an embodiment of the invention, carburizing and quenching processing in, carbon potential be 0.7~0.8%, processing the time be 0.75~
1.25h.It is passed through carbon potential in quenching process, chain skin decarburization can be prevented, maintains required carbon contents.
Specific example according to the present invention, quenching treatment can be completed by the way that carburizing product is carried out oil quenching.Specifically, root
According to the embodiment of the present invention, can control medium temperature before quenching is 50~60 DEG C, and maximum medium temperature is not higher than 120 in quenching
DEG C, medium temperature is not higher than 85 DEG C after quenching.Thus, it is possible to which the cooling performance of quenching oil is made to obtain maximum performance.For quenching
The medium type of fire processing is not particularly restricted, the quenching oil that this field can be used common.Specific reality according to the present invention
Example is applied, quenching oil can use 169 fast quenching oil of ISOMAX.It quenches rear chain material and martensite transfor mation occurs, improve chain
Hardness and strength.
Specific equipment used in Carburization Treatment is not particularly restricted, the carburizing equipment that this field can be used common,
Such as carburizer etc..According to some embodiments of the present invention, before progress first to third Carburization Treatment to workpiece to be handled,
Empty furnace can be warming up to 700~800 DEG C first, thus, it is possible to reduce workpiece internal-external temperature difference, reduce tearing tendency, prevent from becoming
The generation of shape or crackle.In addition, carburizing medium can use propane and air, and by adjusting propane in above-mentioned Carburization Treatment
Carbon potential is adjusted with the proportion of air.
S300: the first tempering
In the step, quenching product is subjected to the first tempering and air-cooled, obtains the first tempered product.
Preferred embodiment in accordance with the present invention, the first tempering are that 2.75~3.25h of progress is complete at 220~240 DEG C
At.After the completion of first tempering, carry out air-cooled.
S400: the second tempering
In the step, the first tempered product is subjected to the second tempering and air-cooled, obtains round-link chain product.
Preferred embodiment in accordance with the present invention, the first tempering are that 2.75~3.25h of progress is complete at 180~200 DEG C
At.After the completion of second tempering, progress is air-cooled, to complete the heat treatment of round-link chain.
The technique for generalling use the tempering of low temperature single in the prior art is tempered the workpiece that carburizing obtains, and leads to workpiece
Toughness declines under the influence of temper brittleness, the disabled status such as occurs being broken in use.Inventor passes through lot of experiments
It was found that by under above-mentioned process conditions to carburizing after workpiece carry out double tempering, chain grinding crack can be effectively reduced
It generates, so that the wearability and corrosion resistance of product are significantly improved, the cracking for avoiding round-link chain from easily occurring in use, size pitch
Unstable, the problems such as service life is short generation.Tempering makes austenite structure remaining in round-link chain material become horse for the first time
Family name's body tissue is tempered for the second time with lower temperature, and remaining austenite can be made to continue to be changed into martensite, made simultaneously
Martensite transfor mation is more stable tempered martensite, so that the hardness on surface and wearability is further enhanced, surface
Crackle reduce.
According to an embodiment of the invention, round-link chain heat treatment method of the invention does not do the material of round-link chain to be processed
Especially limitation, the round-link chain suitable for various materials.Preferred embodiment in accordance with the present invention, round-link chain heat treatment side of the invention
Method is more suitable for the round-link chain formed using low-carbon chromium Ni-Mo alloy steel.Specifically, above-mentioned low-carbon chromium Ni-Mo alloy steel includes: 0.14
The Mn of the Si of the C of~0.19wt%, 0.15~0.4wt%, 0.4~0.6wt%, the S not higher than 0.035wt%, are not higher than
The Mo and surplus of the Ni of the Cr of 0.035% P, 1.50~1.80wt%, 1.40~1.70wt%, 0.25~0.35wt%
Fe.The low-carbon chromium Ni-Mo alloy steel of above-mentioned composition has better plasticity and toughness and corrosion resisting property, and core still may be used after carburizing
To obtain preferable elongation percentage.The annulus that round-link chain heat treatment method processing low-carbon chromium Ni-Mo alloy steel through the invention is formed
Chain, can be more conducive to the performance of low-carbon chromium nickel-molybdenum alloy Steel material excellent performance itself, and the product handled has stronger
Chain core toughness and higher elongation percentage.
According to some embodiments of the present invention, the first and second temperings can carry out in HH01 chamber type annealing stove.
In another aspect of this invention, the invention proposes a kind of round-link chains.According to an embodiment of the invention, the round-link chain
It is to be handled using the round-link chain heat treatment method of above-described embodiment.Round-link chain phase according to an embodiment of the present invention as a result,
For existing round-link chain have higher wearability and corrosion resistance, be less prone in use cracking, size pitch it is unstable,
The problems such as service life is short, and have the advantages that simple production process, high production efficiency, quality product rate are high.
It should be noted that being equally applicable to the circle described previously for feature and advantage described in round-link chain heat treatment method
Loop chain, this is no longer going to repeat them.
Below with reference to specific embodiment, present invention is described, it should be noted that these embodiments are only to describe
Property, without limiting the invention in any way.
Embodiment 1
With reference to Fig. 2 and 3, round-link chain is heat-treated.
(1) empty furnace is warming up to 700 DEG C first, opens simultaneously recirculated cooling water to control furnace temperature, third is passed through into furnace
Alkane gas carries out empty furnace carburizing, and persistently overheating to furnace temperature reaches 920 DEG C of carburizing temperature, and carbon potential 1.0%, heat preservation carries out carburizing 8h；
(2) carbon potential is reduced after above-mentioned carburizing to 0.9%, heat preservation carries out carburizing 7h；
(3) after above-mentioned carburizing, carbon potential is down to 0.7%, and heat preservation carries out carburizing 7h；
(4) after the completion of carburizing, furnace temperature is down to 810 DEG C, and carbon potential 0.7%, heat preservation 1h carries out Deep Carburization Process；
(5) after the completion of carburizing, quenching cooling is carried out with 169 fast quenching oils, cooling preceding 50~60 DEG C of medium temperature is cooling
Medium temperature≤85 DEG C afterwards；
(6) after the completion of quenching, furnace temperature is risen to 220 DEG C, heat preservation 3h carries out first time tempering, then air-cooled；
(7) after being tempered for the first time, furnace temperature is risen to 180 DEG C again, keeps the temperature 3h, second is carried out and is tempered, it is rear air-cooled,
Start bell and takes out workpiece.
Embodiment 2
With reference to Fig. 2 and 3, round-link chain is heat-treated.
(1) empty furnace is warming up to 800 DEG C first, opens simultaneously recirculated cooling water, propane gas is passed through into furnace and carries out sky
Furnace carburizing, persistently overheating to furnace temperature reach 930 DEG C of carburizing temperature, and carbon potential 1.1%, heat preservation carries out carburizing 8h；
(2) carbon potential is reduced after above-mentioned carburizing to 1.0%, heat preservation carries out carburizing 7h；
(3) after above-mentioned carburizing, carbon potential is down to 0.8%, and heat preservation carries out carburizing 7h；
(4) after the completion of carburizing, furnace temperature is down to 810 DEG C, and carbon potential 0.8%, heat preservation 1h carries out Deep Carburization Process；
(5) after the completion of carburizing, quenching cooling is carried out with 169 fast quenching oils, cooling preceding 50~60 DEG C of medium temperature is cooling
Medium temperature≤85 DEG C afterwards；
(6) after the completion of quenching, furnace temperature is risen to 240 DEG C, heat preservation 3h carries out first time tempering, then air-cooled；
(7) after being tempered for the first time, furnace temperature is risen to 200 DEG C again, keeps the temperature 3h, second is carried out and is tempered, it is rear air-cooled,
Start bell and takes out workpiece.
Embodiment 3
With reference to Fig. 2 and 3, round-link chain is heat-treated.
(1) empty furnace is warming up to 750 DEG C first, opens simultaneously recirculated cooling water, propane gas is passed through into furnace and carries out sky
Furnace carburizing, persistently overheating to furnace temperature reach 925 DEG C of carburizing temperature, and carbon potential 1.1%, heat preservation carries out carburizing 8h；
(2) carbon potential is reduced after above-mentioned carburizing to 0.9%, heat preservation carries out carburizing 7h；
(3) after above-mentioned carburizing, carbon potential is down to 0.7%, and heat preservation carries out carburizing 7h；
(4) after the completion of carburizing, furnace temperature is down to 825 DEG C, and carbon potential 0.8%, heat preservation 1h carries out Deep Carburization Process；
(5) after the completion of carburizing, quenching cooling is carried out with 169 fast quenching oils, cooling preceding 50~60 DEG C of medium temperature is cooling
Medium temperature≤85 DEG C afterwards；
(6) after the completion of quenching, furnace temperature is risen to 235 DEG C, heat preservation 3h carries out first time tempering, then air-cooled；
(7) after being tempered for the first time, furnace temperature is risen to 190 DEG C again, keeps the temperature 3h, second is carried out and is tempered, it is rear air-cooled,
Start bell and takes out workpiece.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of round-link chain heat treatment method characterized by comprising
(1) round-link chain to be processed is subjected to Carburization Treatment under the first treatment temperature, the Carburization Treatment include it is strong seep the stage and
Diffusion phase；
(2) step (1) products obtained therefrom is subjected at a temperature of second processing carburizing and quenching processing, obtains carburizing and quenching product；
(3) the carburizing and quenching product is subjected to the first tempering and air-cooled, obtains the first tempered product；
(4) first tempered product is subjected to the second tempering and air-cooled, obtains round-link chain product.
2. round-link chain heat treatment method according to claim 1, which is characterized in that first treatment temperature be 920~
930℃。
3. round-link chain heat treatment method according to claim 1, which is characterized in that the strong infiltration stage includes the first stage
And second stage, in the first stage, carbon potential is 1.0~1.1%, the time that first stage carries out is 7.75~
8.25h。
4. round-link chain heat treatment method according to claim 2, which is characterized in that in the second stage, carbon potential 0.9
~1.0%, the time that the second stage carries out is 6.75~7.25h.
5. round-link chain heat treatment method according to claim 1, which is characterized in that in the diffusion phase, carbon potential 0.7
~0.8%, the time that the diffusion phase carries out is 6.75~7.25h.
6. round-link chain heat treatment method according to claim 1, which is characterized in that the second processing temperature be 810~
830℃。
7. round-link chain heat treatment method according to claim 1, which is characterized in that in the carburizing and quenching processing, first
0.75~1.25h of Deep Carburization Process is carried out with the condition that carbon potential is 0.7~0.8% at a temperature of the second processing, then is quenched
Fire.
8. round-link chain heat treatment method according to claim 1, which is characterized in that first tempering is 220
Carry out what 2.75~3.25h was completed at~240 DEG C；
Optionally, second tempering is to carry out 2.75~3.25h at 180~200 DEG C to complete.
9. any one round-link chain heat treatment method according to claim 1~8, which is characterized in that the round-link chain to be processed
It is formed by steel alloy, the steel alloy includes: the C of 0.14~0.19wt%, the Si of 0.15~0.4wt%, 0.4~0.6wt%
Mn, the S not higher than 0.035wt%, the P not higher than 0.035%, the Cr of 1.50~1.80wt%, 1.40~1.70wt%'s
The Mo of Ni, 0.25~0.35wt% and the Fe of surplus.
10. a kind of round-link chain, which is characterized in that the round-link chain is using round-link chain heat according to any one of claims 1 to 9
What processing method was handled.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110387521A (en) * | 2019-06-20 | 2019-10-29 | 苏州佳世捷机械有限公司 | A kind of carburizing heat treatment method that metal skin hardness is modified |
| CN113692327A (en) * | 2019-04-16 | 2021-11-23 | 大同工业株式会社 | Connecting pin for chain and method for producing same |
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