CN109182680A - A kind of control method of the cold-heading annealing hardness of martensitic stain less steel Bar Wire Product - Google Patents
A kind of control method of the cold-heading annealing hardness of martensitic stain less steel Bar Wire Product Download PDFInfo
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- CN109182680A CN109182680A CN201811376168.7A CN201811376168A CN109182680A CN 109182680 A CN109182680 A CN 109182680A CN 201811376168 A CN201811376168 A CN 201811376168A CN 109182680 A CN109182680 A CN 109182680A
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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
- C21D1/32—Soft annealing, e.g. spheroidising
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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
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C21D6/005—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
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The present invention provides a kind of method for annealing of martensite stainless steel material, include the following steps, keep the temperature after martensite stainless steel material is heated to austenite one phase area first, the tissue after obtaining austenitizing；Then the tissue after austenitizing above-mentioned steps obtained, cools down, and after being down to isothermal spheroidizing temperature, keeps the temperature again, the tissue after obtaining isothermal spheroidizing；Tissue after the isothermal spheroidizing that finally above-mentioned steps are obtained, after cooling down again, the globular pearlite tissue after being annealed.The technology that the present invention is combined by using " monophase field austenitizing+isothermal spheroidizing ", improve matrix crystallite dimension and distribution of carbides situation, so as to which the annealing hardness of martensitic stain less steel raw material is reduced to 165HB or less, and the maintenance of remaining indices meets GB/T1220 relevant provision requirement, and then meets the needs of subsequent applications.
Description
Technical field
The invention belongs to martensitic stain less steel technical fields, are related to a kind of method for annealing of martensite stainless steel material, especially
A kind of control method of its annealing hardness for being related to cold-heading martensitic stain less steel Bar Wire Product.
Background technique
Martensitic stain less steel refers to that by the stainless steel for being heat-treated adjustable mechanical property be generally that one kind can
The stainless steel of hardening.The typical trade mark is Cr13 type, such as 2Cr13,3Cr13 and 4Cr13.Hardness after martensitic stain less steel quenching
Higher, different tempering temperatures are combined with different obdurabilities, are mainly used for steam turbine blade, tableware, surgical operating instrument.Root
According to the difference of chemical component, martensitic stain less steel can be divided into two class of martensitic chromium steel and martensitic chromium nickel steel.According to tissue and by force
The difference for changing mechanism, can also be divided into martensitic stain less steel, martensite and semiaustenitic (or half martensite) precipitation-hardening stainless steel
And martensite aged stainless steel etc..
In martensitic stain less steel, cold pier martensitic stain less steel Bar Wire Product, representing the trade mark has standard GB/T/T 1220
In 20Cr13, GB/T 4356 in 2Cr13, be 420 in corresponding American Standard ASTM A 276-17, day marks JIS G4303-2012
In be 420J1, with certain corrosion resistance, good mechanical performance can be obtained again by modifier treatment.Therefore, 20Cr13
Rod iron line is widely used, generally all as the raw material of machine-building, for standard machinery processing or thermal pressure processing, so right
The annealing hardness of raw material is of less demanding, and regulation, which meets, in GB/T1220 is not more than 223HB.To such hardness range,
The techniques such as common spheroidizing, full annealing, partial annealing or even high-temperature tempering process can be met the requirements.
In the industry 20Cr13 rod iron line be widely used in production household electrical appliance shaft member and valve rod, especially production washing machine from
The preferred material of clutch component.Since the material is for when producing washing machine shaft member, traditional manufacturing process to include (here only
Process before being related to the molding being closely related with raw material, without regard to successive depths machine) drawing, aligning segmentation, annealing,
Polishing, sawing, centering, cold-heading molding (being generally called cold-heading in the industry, actually include cold-heading, cold forging and cold extrusion), these
Flow chart is labor-intensive mostly, and the degree of automation is not high, thus efficiency is lower, higher cost, to steel (rod iron line)
The requirement of annealing hardness is not also high, substantially executes referring to GB/T1220 standard.
But with the continuous development of science and technology, washing machine shaft member manufacturing firm for raising efficiency and reduces cost, mostly
Process and process optimization, main change are carried out, first is that aligning, cold punching blanking, centering, cold-heading molding to be integrated into one and set
It is standby upper, it is exactly a process in terms of work angle；Second is that light draw after rule circle not re-annealing, also not re-segmenting.In this way, significantly
The process that ground is simplified, reduces manufacturing cost, improves stock utilization, has also greatly improved efficiency.But these change
Become, raw material is just proposed with more more harsh requirements, wherein most important is exactly the annealing hardness of raw material.Traditional processing
In process, it is the processing hardening for eliminating drawing generation by annealing, guarantees that subsequent cold-heading molding is smooth, process flow is simplified excellent
After change, processing hardening caused by drawing is still inevitable, it is ensured that subsequent cold-heading is unaffected, and the original hardness of raw material must
It must drop to lower.
However, existing martensitic stain less steel Bar Wire Product production process, is substantially and executes referring to GB/T1220 standard, institute
With associated production enterprise in the industry for how annealing hardness being dropped to lower range, existing correlative study is not very deep
Enter, the report of correlative study is also actually rare, this obviously can not be with the actual demand of vertical industry.
Therefore, the annealing hardness for how reducing martensitic stain less steel raw material meets the requirement of subsequent applications, guarantees subsequent
The requirement of cold-heading molding, it has also become many martensitic stain less steel raw materials manufacturer and a line researcher urgent problem to be solved it
One.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is that providing a kind of annealing side of martensite stainless steel material
Method, the control method of especially a kind of cold-heading annealing hardness of martensitic stain less steel Bar Wire Product, is moved back using provided by the invention
Fire process can effectively reduce the annealing hardness of martensitic stain less steel raw material, so that it is reduced to 165HB hereinafter, full in turn
The needs of sufficient subsequent applications, and simple process, mild condition is easily controllable, the promotion and application suitable for large-scale production.
The present invention provides a kind of method for annealing of martensite stainless steel material, comprising the following steps:
1) it is kept the temperature after martensite stainless steel material being heated to austenite one phase area, the tissue after obtaining austenitizing；
2) tissue after the austenitizing for obtaining above-mentioned steps, cools down, and after being down to isothermal spheroidizing temperature, protects again
Temperature, the tissue after obtaining isothermal spheroidizing；
3) tissue after the isothermal spheroidizing for obtaining above-mentioned steps, after cooling down again, the globular pearlite after being annealed
Tissue.
Preferably, the temperature in the austenite one phase area is Ac3+30~Ac3+50 DEG C；
The martensitic stain less steel includes 20Cr13.
Preferably, the temperature in the austenite one phase area is 945~955 DEG C；
The martensite stainless steel material includes martensitic stain less steel bar or martensitic stain less steel wire rod.
Preferably, the diameter of the martensite stainless steel material is 5.5~40mm.
Preferably, the martensitic stain less steel is cold-heading martensitic stain less steel；
The time of the heat preservation is 150~300 minutes.
Preferably, the martensite stainless steel material is the martensite stainless steel material after rolling；
The rate of the cooling is less than or equal to 30 DEG C/h.
Preferably, the temperature of the isothermal spheroidizing is 755~765 DEG C；
The time kept the temperature again is 360~720 minutes；
The rate to cool down again is less than or equal to 30 DEG C/h.
Preferably, the step 3) specifically:
Tissue after the isothermal spheroidizing that above-mentioned steps are obtained after cooling down again, completes the continuous balling stage, continues to cool down
Afterwards, the globular pearlite tissue after being annealed.
Preferably, the temperature after the cooling again is less than or equal to 550 DEG C；
The mode for continuing cooling is air-cooled to come out of the stove.
Preferably, for the martensite stainless steel material after annealing, hardness is less than or equal to 165HB.
The present invention provides a kind of method for annealing of martensite stainless steel material, include the following steps, first by martensite
Stainless steel material is kept the temperature after being heated to austenite one phase area, the tissue after obtaining austenitizing；Then above-mentioned steps are obtained
Tissue after austenitizing, cools down, and after being down to isothermal spheroidizing temperature, keeps the temperature again, the tissue after obtaining isothermal spheroidizing；Most
Tissue after the isothermal spheroidizing that above-mentioned steps are obtained afterwards, after cooling down again, the globular pearlite tissue after being annealed.Have
There is the stainless steel material of globular pearlite tissue.Compared with prior art, the present invention is directed to existing martensite stainless steel material
In raw material production process, annealing hardness is of less demanding, meets according to regulation in GB/T1220 and is not more than 223HB, so
Such hardness range, the techniques such as common spheroidizing, full annealing, partial annealing or even high-temperature tempering process can
It meets the requirements.But with the process integration in downstream field, to the main performance of raw material -- annealing hardness proposes more tighter
Severe requirement, it is ensured that the cold-heading of subsequent applications manufacturer is unaffected, and the original hardness of raw material must just drop to lower existing
Shape.
It is presently believed that the original hardness of only raw material drop to it is lower, it is desirable in 165HB or less, ability
Better meet the requirement of subsequent applications manufacturer.The present invention proposes a kind of cold pier martensitic stain less steel former material charge bar line in turn
The control method of material annealing hardness, the creative skill combined by using both " monophase field austenitizing+isothermal spheroidizing "
Art improves matrix crystallite dimension and distribution of carbides situation, so as to effectively reduce martensitic stain less steel raw material
Annealing hardness, so that it is reduced to 165HB hereinafter, meeting the needs of subsequent applications in turn, and simple process, mild condition,
Easily controllable, suitable for large-scale production promotion and application.
The experimental results showed that the present invention cold pier can be reduced to the annealing hardness of martensitic stain less steel Bar Wire Product it is most ideal
≤ 165HB, and the maintenance of remaining indices meets GB/T1220 relevant provision requirement, the detection method of indices and sentences
Determine foundation, keeps carrying out according to the regulation of GB/T1220 and its corresponding clause of normative reference.
Specific embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described below with reference to embodiment, still
It should be appreciated that these descriptions are intended merely to further illustrate the features and advantages of the present invention, rather than to invention claim
Limitation.
All raw materials of the present invention, are not particularly limited its source, buying on the market or according to those skilled in the art
The preparation of conventional method known to member.
All raw materials of the present invention, are not particularly limited its purity, and present invention preferably employs technical pure or martensite are stainless
The purity requirement of steel technical field routine.
Technique and product used in the present invention, it is conventional referred to as that abbreviation belongs to this field, the specific steps of each abbreviation and
Conventional parameter be in its related fields it is explicit, those skilled in the art according to referred to as, can in conventional manner into
Row is realized.
The present invention provides a kind of method for annealing of martensite stainless steel material, comprising the following steps:
1) it is kept the temperature after martensite stainless steel material being heated to austenite one phase area, the tissue after obtaining austenitizing；
2) tissue after the austenitizing for obtaining above-mentioned steps, cools down, and after being down to isothermal spheroidizing temperature, protects again
Temperature, the tissue after obtaining isothermal spheroidizing；
3) tissue after the isothermal spheroidizing for obtaining above-mentioned steps, after cooling down again, the globular pearlite after being annealed
Tissue.
The present invention is kept the temperature after martensite stainless steel material is heated to austenite one phase area first, after obtaining austenitizing
Tissue.
The present invention is in principle not particularly limited the definition and composition of the martensitic stain less steel, with those skilled in the art
The definition of martensitic stain less steel known to member and composition, those skilled in the art can be according to practical situations, product
It is required that and quality requirement selected and adjusted, the present invention be preferably reduce annealing after hardness, the martensitic stain less steel
20Cr13 is preferably included, i.e. the 2Cr13 in 20Cr13, GB/T 4356, American Standard ASTM A in standard GB/T/T 1220
420 in 276-17, day marks the 420J1 in JIS G4303-2012.
The present invention is in principle not particularly limited the form of the martensite stainless steel material, with those skilled in the art
The conventional form of well known martensite stainless steel material, those skilled in the art can be according to practical situations, product
It is required that and quality requirement selected and adjusted, the present invention be preferably reduce annealing after hardness, the martensitic stain less steel
Material preferably includes martensitic stain less steel bar or martensitic stain less steel wire rod.
The present invention is in principle not particularly limited the size of the martensite stainless steel material, and those skilled in the art can
To be selected and be adjusted according to practical situations, product requirement and quality requirement, the present invention is after preferably reducing annealing
Hardness, the diameter of the martensite stainless steel material is preferably 5.5~40mm, more preferably 12~30mm.
The present invention is in principle not particularly limited the martensitic stain less steel, and those skilled in the art can be according to reality
Applicable cases, product requirement and quality requirement are selected and are adjusted, and the present invention is preferably to reduce the hardness after annealing, described
Martensitic stain less steel is preferably cold-heading martensitic stain less steel.The martensite stainless steel material is preferably the martensite after rolling
Stainless steel material, the more preferably martensite stainless steel material after hot rolling.
The present invention is in principle not particularly limited the actual temp in the austenite one phase area, with those skilled in the art
The temperature in well known austenite one phase area, those skilled in the art can be according to practical situations, product requirement and matter
Amount requires to be selected and adjusted, and the present invention is preferably to reduce the hardness after annealing, and the temperature in the austenite one phase area is excellent
It is selected as Ac3+30~Ac3+50 DEG C, i.e. Ac3+ (30~50) DEG C.The temperature in the austenite one phase area is particularly preferred as 945~
955 DEG C, more preferably 947~953 DEG C, more preferably 949~951 DEG C.
The present invention is in principle not particularly limited the specific time of the heat preservation, and those skilled in the art can be according to reality
Border applicable cases, product requirement and quality requirement are selected and are adjusted, and the present invention is preferably to reduce the hardness after annealing, institute
The time for stating heat preservation is preferably 150~300 minutes, more preferably 180~280 minutes, more preferably 200~250 minutes.
Martensite stainless steel material is first heated to (950 ± 5 DEG C of the heating temperature heat preservations of monophase field austenitizing by the present invention
150~300 minutes), make the roller repairing tissue (the usually resulting martensitic structure of dry quenching) of DEVICE FOR BAR AND WIRE HOT ROLLING in height
Be rapidly converted under temperature ingredient less uniformly (being conducive to the carbide forming core during structural transformation) austenite, and because
For soak grain size is moderately grown up, has certain contribution to hardness is reduced.The present invention and general annealing process
Heating temperature (Ac1+30~50 DEG C, the start temperature that pearlite changes to austenite when Ac1 refers to heating) compare, the present invention
The heating temperature taken is Ac3+30~50 DEG C (the end of a period temperature of all austenites of free ferrite when Ac3 refers to heating
Degree).Since temperature is increased to single phase austenite humidity province, there is 3 significant changes: 1. crystal grain is a degree of grows up；2. Ovshinsky
Shorten the time required to bodyization；3. diffusion is fast, unsuitable long-time heat preservation, otherwise homogenization of composition, is unfavorable for carbide forming core nodularization.
Tissue after the austenitizing that the present invention then obtains above-mentioned steps, cools down, and is down to isothermal spheroidizing temperature
Afterwards, it keeps the temperature again, the tissue after obtaining isothermal spheroidizing.
The present invention is in principle not particularly limited the design parameter of the cooling, and those skilled in the art can be according to reality
Border applicable cases, product requirement and quality requirement are selected and are adjusted, and the present invention is preferably to reduce the hardness after annealing, institute
The rate for stating cooling is preferably smaller than equal to 30 DEG C/h, more preferably less than or equal to 25 DEG C/h, more preferably less than or equal to 20 DEG C/h, more excellent
Choosing is less than or equal to 15 DEG C/h.
Temperature after cooling is especially controlled the temperature for isothermal spheroidizing by the present invention, and the present invention is in principle to the isothermal ball
The actual temp of the temperature of change is not particularly limited, with the temperature of isothermal spheroidizing well known to those skilled in the art, ability
Field technique personnel can select and adjust according to practical situations, product requirement and quality requirement, and the present invention is more preferable
Reduction annealing after hardness, the temperature of the isothermal spheroidizing is preferably 755~765 DEG C, more preferably 757~763 DEG C, more excellent
It is selected as 759~761 DEG C.
The present invention is in principle not particularly limited the design parameter kept the temperature again, and those skilled in the art can root
It is selected and is adjusted according to practical situations, product requirement and quality requirement, the present invention is hard after preferably reducing annealing
Degree, the time kept the temperature again is preferably 360~720 minutes, more preferably 420~660 minutes, more preferably 480~600
Minute.
The present invention especially isothermal spheroidizing at a temperature of keep the temperature, 760 ± 5 DEG C of temperature, keep the temperature 360~720 minutes,
It is kept the temperature under the conditions of certain degree of supercooling, promotion carbide forming core is grown up and nodularization is abundant and uniform, so that tissue hardness is further
It is effectively reduced.This process, there are two key points: 1. degree of supercooling, if too small, is unfavorable for forming core；Degree of supercooling is too big, then forming core fills
Divide but diffusion is too slow, final carbide spheroidization granulation is insufficient and is in dotted；2. isothermal time, should not be too short, otherwise nodularization is not
Sufficiently, hardness cannot be effectively reduced, overlong time is harmless in nodularization, but uneconomical.
Tissue after the isothermal spheroidizing that the present invention finally obtains above-mentioned steps, after cooling down again, the ball after being annealed
Shape pearlitic structrure
The present invention is in principle not particularly limited the design parameter to cool down again, and those skilled in the art can root
It is selected and is adjusted according to practical situations, product requirement and quality requirement, the present invention is hard after preferably reducing annealing
Degree, the rate to cool down again are preferably smaller than equal to 30 DEG C/h, more preferably less than or equal to 25 DEG C/h, and more preferably less than or equal to 20
DEG C/h, more preferably less than or equal to 15 DEG C/h.
The present invention is to further increase and guarantee the performance of final stainless steel material, complete and refinement integrated artistic mistake
Journey, above-mentioned steps are particularly preferred as:
Tissue after the isothermal spheroidizing that above-mentioned steps are obtained after cooling down again, completes the continuous balling stage, continues to cool down
Afterwards, the globular pearlite tissue after being annealed.
The present invention is in principle not particularly limited the temperature after the cooling again, and those skilled in the art can basis
Practical situations, product requirement and quality requirement are selected and are adjusted, and the present invention is preferably to reduce the hardness after annealing,
Temperature after the cooling again, the i.e. temperature in completion continuous balling stage are preferably smaller than equal to 550 DEG C.
The present invention is in principle not particularly limited the design parameter for continuing cooling and mode, those skilled in the art
It can be selected and be adjusted according to practical situations, product requirement and quality requirement, the present invention is preferably to reduce annealing
Hardness afterwards, it is described continue cooling mode it is preferably air-cooled, be specifically as follows come out of the stove it is air-cooled.
The present invention is the annealing hardness for further decreasing cold-heading martensitic stain less steel Bar Wire Product, guarantees other stainless steels
Material property, complete and refinement whole technological process, the control technique of above-mentioned annealing hardness are specifically as follows following steps:
Step 1: heating is warming up to 950 ± 5 DEG C of austenite one phase area；
Step 2: austenitizing keeps the temperature 180 minutes at 950 ± 5 DEG C, controls austenitizing process；
Step 3: cooling cools down according to≤30 DEG C/h, until 760 ± 5 DEG C of isothermal spheroidizing temperature, forms certain mistake
Cold degree；
Step 4: isothermal spheroidizing keeps the temperature 360 minutes at 760 ± 5 DEG C, when so that the precipitation of carbide having relatively sufficient
Between；
Step 5: cooling, while being also the continuous balling stage, cool down according to≤30 DEG C/h, until 550 DEG C or less；
Step 6: coming out of the stove air-cooled.
Above-mentioned steps of the present invention provide a kind of control method of the annealing hardness of cold-heading martensitic stain less steel Bar Wire Product,
The creative technology combined by using both " monophase field austenitizing+isothermal spheroidizing ", monophase field austenitizing make heat
The roller repairing tissue for rolling Bar Wire Product is rapidly converted to the less uniform austenite of ingredient, and because high temperature dwell at high temperature
Temperature and grain size is moderately grown up, can reduce hardness；Simultaneously using isothermal spheroidizing under the conditions of process, certain degree of supercooling
Heat preservation, promotion carbide forming core is grown up and nodularization is abundant and uniform, so that tissue hardness is further effectively reduced.The present invention improves
The crystallite dimension and distribution of carbides situation of matrix, so as to effectively reduce moving back for martensitic stain less steel raw material
Fiery hardness makes it be reduced to 165HB hereinafter, meeting the needs of subsequent applications in turn, and simple process, mild condition are easy to
Control, the promotion and application suitable for large-scale production.
The experimental results showed that the present invention cold pier can be reduced to the annealing hardness of martensitic stain less steel Bar Wire Product it is most ideal
≤ 165HB, and the maintenance of remaining indices meets GB/T1220 relevant provision requirement, the detection method of indices and sentences
Determine foundation, keeps carrying out according to the regulation of GB/T1220 and its corresponding clause of normative reference.
In order to further illustrate the present invention, with reference to embodiments to a kind of martensite stainless steel material provided by the invention
Method for annealing be described in detail, but it is to be understood that these embodiments be under the premise of the technical scheme of the present invention into
Row is implemented, and the detailed implementation method and specific operation process are given, only to further illustrate feature of the invention and excellent
Point, rather than limiting to the claimed invention, protection scope of the present invention are also not necessarily limited to following embodiments.
Embodiment 1
Using cold pier 20Cr13 rod iron, specification are as follows: φ 28mm.Specific treatment process is as follows:
1, heat (batch) number, specification
Heat (batch) number: 117V-891；Diameter of rod: φ 28mm, hardness average value 456HB before annealing.
2, bar quality.Referring to table 1, table 1 is tissue, grain size and the composition (Wt%) of sample.
Table 1
3, process flow
Step 1: heating is warming up to 950 ± 5 DEG C；
Step 2: austenitizing keeps the temperature 180 minutes at 950 ± 5 DEG C, controls austenitizing process；
Step 3: cooling cools down according to≤30 DEG C/h, until 760 ± 5 DEG C of isothermal spheroidizing temperature；
Step 4: isothermal spheroidizing keeps the temperature 360 minutes at 760 ± 5 DEG C；
Step 5: cooling, while being also the continuous balling stage, it carries out being cooled to 550 DEG C or less according to≤30 DEG C/h；
Step 6: it comes out of the stove air-cooled.
Performance detection is carried out to sample prepared by the embodiment of the present invention 1.
Referring to table 2, the mechanical property of martensitic stain less steel bar, Bu Shi after the annealing that table 2 obtains for the embodiment of the present invention 1
Hardness results.
Table 2
As shown in Table 2, the finished product bar sample testing result of the embodiment of the present invention 1, mechanics properties testing expire GB/
T1220-2007 requirement, annealing Brinell hardness testing result reach the desirable of cold pier user.
Embodiment 2
Using cold pier 20Cr13 rod iron of the invention, specification are as follows: φ 28mm.Specific treatment process is as follows:
1, heat (batch) number, specification
Heat (batch) number: 117V-900；Diameter: φ 28mm.Hardness average value 449HB before annealing.
2, bar quality.Referring to table 3, table 3 is tissue, grain size and the composition (Wt%) of sample.
Table 3
3, process flow
Step 1: heating heats up 950 ± 5 DEG C of austenitizing heating temperature；
Step 2: austenitizing keeps the temperature 180 minutes at 950 ± 5 DEG C, controls austenitizing process；
Step 3: cooling cools down according to≤30 DEG C/h, until 760 ± 5 DEG C of isothermal spheroidizing temperature；
Step 4: isothermal spheroidizing keeps the temperature 720 minutes at 760 ± 5 DEG C；
Step 5: cooling, while being also the continuous balling stage, it carries out being cooled to 550 DEG C or less according to≤30 DEG C/h；
Step 6: it comes out of the stove air-cooled.
Performance detection is carried out to sample prepared by the embodiment of the present invention 2.
Referring to table 4, the mechanical property of martensitic stain less steel bar, Bu Shi after the annealing that table 4 obtains for the embodiment of the present invention 2
Hardness results.
Table 4
As shown in Table 4, the finished product bar sample testing result of the embodiment of the present invention 2, mechanics properties testing expire GB/
T1220-2007 requirement, annealing Brinell hardness testing result reach the desirable of cold pier user.
Embodiment 3
The cold pier 20Cr13 rod iron handled using the present invention, specification are as follows: φ 28mm.Specific treatment process is as follows:
1, heat (batch) number, specification
Heat (batch) number: 117V-891；Diameter: φ 28mm.Hardness average value 456HB before annealing.
2, bar quality.Referring to table 5, table 5 is tissue, grain size and the composition (Wt%) of sample.
Table 5
3, process flow
Step 1: heating, 950 ± 5 DEG C of austenitizing heating temperature；
Step 2: austenitizing keeps the temperature 180 minutes at 950 ± 5 DEG C, controls austenitizing process；
Step 3: cooling cools down according to≤30 DEG C/h, until 760 ± 5 DEG C of isothermal spheroidizing temperature；
Step 4: isothermal spheroidizing keeps the temperature 720 minutes at 760 ± 5 DEG C；
Step 5: cooling, while being also the continuous balling stage, it carries out being cooled to 550 DEG C or less according to≤30 DEG C/h；
Step 6: it comes out of the stove air-cooled.
Performance detection is carried out to sample prepared by the embodiment of the present invention 3.
Referring to table 6, table 6 is the grain size and Bu Shi of martensitic stain less steel bar after the annealing that the embodiment of the present invention 3 obtains
Hardness results.
Table 6
As shown in Table 6, the Hardness results of the finished product bar sample of the embodiment of the present invention 3, meet the reason of cold pier user
It wants to claim.
Embodiment 4
The cold pier 20Cr13 rod iron handled using the present invention, specification are as follows: φ 28mm.Specific treatment process is as follows:
1, heat (batch) number, bar specification
Heat (batch) number: 117V-249；Diameter of rod: φ 28mm.Hardness average value 456HB before annealing.
2, bar quality.Referring to table 7, table 7 is tissue, grain size and the composition (Wt%) of sample.
Table 7
3, process flow
Step 1: heating, 950 ± 5 DEG C of austenitizing heating temperature；
Step 2: austenitizing keeps the temperature 240 minutes at 950 ± 5 DEG C, controls austenitizing process；
Step 3: cooling cools down according to≤30 DEG C/h, until 760 ± 5 DEG C of isothermal spheroidizing temperature；
Step 4: isothermal spheroidizing keeps the temperature 360 minutes at 760 ± 5 DEG C；
Step 5: cooling, while being also the continuous balling stage, it carries out being cooled to 550 DEG C or less according to≤30 DEG C/h；
Step 6: it comes out of the stove air-cooled.
Performance detection is carried out to sample prepared by the embodiment of the present invention 4.
Referring to table 8, table 8 is the grain size and Bu Shi of martensitic stain less steel bar after the annealing that the embodiment of the present invention 4 obtains
Hardness results.
Table 8
As shown in Table 8, the Hardness results of the finished product bar sample of the embodiment of the present invention 4, meet the reason of cold pier user
It wants to claim.
Embodiment 5
The cold pier 20Cr13 rod iron handled using the present invention, specification are as follows: φ 28mm.Specific treatment process is as follows:
1, heat (batch) number, bar specification
Heat (batch) number: 117V-249；Bar Wire Product diameter: φ 28mm.Hardness average value 456HB before annealing.
2, bar quality.Referring to table 9, table 9 is tissue, grain size and the composition (Wt%) of sample.
Table 9
3, process flow
Step 1: heating, 950 ± 5 DEG C of austenitizing heating temperature；
Step 2: austenitizing keeps the temperature 300 minutes at 950 ± 5 DEG C, controls austenitizing process；
Step 3: cooling cools down according to≤30 DEG C/h, until 760 ± 5 DEG C of isothermal spheroidizing temperature；
Step 4: isothermal spheroidizing keeps the temperature 540 minutes at 760 ± 5 DEG C；
Step 5: cooling, while being also the continuous balling stage, it carries out being cooled to 550 DEG C or less according to≤30 DEG C/h；
Step 6: it comes out of the stove air-cooled.
Performance detection is carried out to sample prepared by the embodiment of the present invention 5.
Referring to table 10, table 10 is the grain size and cloth of martensitic stain less steel bar after the annealing that the embodiment of the present invention 5 obtains
Family name's Hardness results.
Table 10
As shown in Table 10, the Hardness results of the finished product bar sample of the embodiment of the present invention 5, meet the reason of cold pier user
It wants to claim.
Above to a kind of control method of the cold-heading annealing hardness of martensitic stain less steel Bar Wire Product provided by the invention into
Detailed introduction is gone, used herein a specific example illustrates the principle and implementation of the invention, the above reality
The explanation for applying example is merely used to help understand method and its core concept of the invention, including best mode, and but also originally
Any technical staff in field can practice the present invention, including any device or system of manufacture and use, and implement any knot
The method of conjunction.It should be pointed out that for those skilled in the art, in the premise for not departing from the principle of the invention
Under, it can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the protection of the claims in the present invention
In range.The range of the invention patent protection is defined by the claims, and may include those skilled in the art it is conceivable that
Other embodiments.If these other embodiments have the structural element for being not different from claim character express, or
If they include the equivalent structural elements with the character express of claim without essence difference, these other embodiments
It should be comprising within the scope of the claims.
Claims (10)
1. a kind of method for annealing of martensite stainless steel material, which comprises the following steps:
1) it is kept the temperature after martensite stainless steel material being heated to austenite one phase area, the tissue after obtaining austenitizing；
2) tissue after the austenitizing for obtaining above-mentioned steps, cools down, and after being down to isothermal spheroidizing temperature, keeps the temperature again,
Tissue after obtaining isothermal spheroidizing；
3) tissue after the isothermal spheroidizing for obtaining above-mentioned steps, after cooling down again, the globular pearlite tissue after being annealed.
2. method for annealing according to claim 1, which is characterized in that the temperature in the austenite one phase area be Ac3+30~
Ac3+50℃；
The martensitic stain less steel includes 20Cr13.
3. method for annealing according to claim 1, which is characterized in that the temperature in the austenite one phase area is 945~955
℃；
The martensite stainless steel material includes martensitic stain less steel bar or martensitic stain less steel wire rod.
4. method for annealing according to claim 3, which is characterized in that the diameter of the martensite stainless steel material is 5.5
~40mm.
5. method for annealing according to claim 1, which is characterized in that the martensitic stain less steel be cold-heading martensite not
Become rusty steel；
The time of the heat preservation is 150~300 minutes.
6. method for annealing according to claim 1, which is characterized in that the martensite stainless steel material is the horse after rolling
Family name's body stainless steel material；
The rate of the cooling is less than or equal to 30 DEG C/h.
7. method for annealing according to claim 1, which is characterized in that the temperature of the isothermal spheroidizing is 755~765 DEG C；
The time kept the temperature again is 360~720 minutes；
The rate to cool down again is less than or equal to 30 DEG C/h.
8. method for annealing according to claim 1, which is characterized in that the step 3) specifically:
Tissue after the isothermal spheroidizing that above-mentioned steps are obtained after cooling down again, completes the continuous balling stage, after continuing cooling,
Globular pearlite tissue after being annealed.
9. method for annealing according to claim 8, which is characterized in that the temperature after the cooling again is less than or equal to 550
℃；
The mode for continuing cooling is air-cooled to come out of the stove.
10. method for annealing described in any one according to claim 1~9, which is characterized in that the martensite stainless steel material
After annealing, hardness is less than or equal to 165HB.
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