CN108148969A - T7 steel and its intensifying method - Google Patents
T7 steel and its intensifying method Download PDFInfo
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- CN108148969A CN108148969A CN201711425308.0A CN201711425308A CN108148969A CN 108148969 A CN108148969 A CN 108148969A CN 201711425308 A CN201711425308 A CN 201711425308A CN 108148969 A CN108148969 A CN 108148969A
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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
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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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
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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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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Abstract
The present invention relates to steel to strengthen field, discloses a kind of T7 steel and its intensifying method, this method include：The step of steel billet of T7 materials is heat-treated, then cooled down under the atmosphere containing nitrogen；Wherein, the step of described be heat-treated includes the first temperature section, second temperature section, third temperature section and the 4th temperature section, cooling carries out in the aqueous solution containing sodium nitrate and potassium nitrate.The T7 steel intensifying method can obtain higher reinforcing layer thickness within the shorter activity duration, T7 steel after reinforcing can significantly improve hardness, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, and can further improve the service life of T7 steel product.
Description
Technical field
The present invention relates to strengthen steel, and in particular, to a kind of T7 steel and its intensifying method.
Background technology
Coated cutting tool is on the preferable hard alloy of strength and toughness or high-speed steel (HSS) matrix surface, utilizes gas phase
The cutter that sedimentation coats the good refractory metal of one layer of wearability or nonmetallic compound and obtains.Coating is as a kind of chemistry screen
Barrier and thermodynamic barrier reduce the diffusion and chemical reaction between cutter and workpiece, so as to reduce crescent abrasion.Coated cutting tool
With case hardness is high, wearability is good, the small characteristics such as low with thermal conductivity of stable chemical performance, heat-resistant oxidized, friction factor, cut
3~5 times of cutter life or more is improved than non-coated tool when cutting, improves cutting speed 20%~70%, improves machining accuracy
0.5~1 grade, reduce cutter consumption costs 20%~50%.
The gas of 201010290331.5 00Ni18Co8Mo5AlTi high strength martensitic aged steels of Chinese patent application oozes
Nitrogen technique is disclosed carries out two-phase method Nitrizing Treatment by following technological parameters：(1) holding temperature：500 ± 5 DEG C, heat preservation 3~4.5
Hour, ammonia dissociation rate：20~30%；(2) holding temperature：505 ± 5 DEG C, 45~75 hours are kept the temperature, ammonia dissociation rate：65~85%.
Chinese patent application 201611195352.2 discloses a kind of system of 304 austenitic stainless steel blade blade of fruit juice mixer
It is as follows that Preparation Method discloses step：The first step：304 austenitic stainless steel blade blade of fruit juice mixer is put into plasma apparatus,
It is evacuated to 5 pa of vacuum degree；Second step：Nitrogen charging external heat is filled with nitrogen to an atmospheric pressure, opens external heat, external heat temperature
Spend is 350 DEG C；Third walks：After blade temperature reaches 300 DEG C of soaking, carry out being evacuated to end vacuum；4th step:Plasma
Nitrizing Treatment continues to be passed through hydrogen 300ml/min, nitrogen 900ml/min into equipment, maintains furnace pressure 150Pa, opens high
Frequency power；5th step：The processing of plasma nitrocarburizing keeps temperature, soaking 30 minutes, Ran Houchi after blade reaches 415 DEG C
It is continuous to be passed through methane 50ml/min, start timing heat preservation, soaking time is 40 hours；6th step：Cooling after heat preservation, is closed
External heat, high frequency electric source are filled with nitrogen to an atmospheric pressure, open inside and outside wind turbine and product is cooled down, when blade temperature is low
When 100 DEG C, shut down equipment and complete plasma nitrocarburizing.
It can be seen that the time in steel alloy surface carburization is longer, 40 hours are at least needed, is poured due in the process, needing
Argon gas, nitrogen or hydrogen, therefore, operation time considerably increases production cost.Therefore, after nitriding is ensured strengthen layer thickness with
And on the basis of the steel alloy hardness brought therewith improves, how a kind of method for reducing the nitriding activity duration is provided, is current
Problem to be solved.
Invention content
The object of the present invention is to provide a kind of T7 steel and its intensifying methods, which can be in shorter operation
Higher reinforcing layer thickness is obtained in time, the T7 steel after reinforcing can significantly improve hardness, moreover, except strengthening layer with
The hardness of outer matrix also gets a promotion, and further improves the service life of T7 steel product.
To achieve these goals, the present invention provides a kind of intensifying method of T7 steel, and the intensifying method is included T7 materials
The step of steel billet of matter is heat-treated, is then cooled down under the atmosphere containing nitrogen；Wherein, the heat treatment includes the first temperature
Spend section, second temperature section, third temperature section and the 4th temperature section；Wherein, the temperature of the first temperature section be 780-820 DEG C, second
Temperature section temperature is 620-650 DEG C, and the temperature of third temperature section is 830-850 DEG C, and the temperature of the 4th temperature section is 780-800
℃；Wherein, in terms of volume content percentage, the content of nitrogen is not less than 30% in the first temperature section atmosphere, second temperature section atmosphere
The content of middle nitrogen is enclosed not less than 50%, and the content of nitrogen is not less than 60% in third temperature section atmosphere, the 4th temperature section atmosphere
The content of middle nitrogen is not less than 80%；Wherein, the step of cooling carries out in the aqueous solution containing sodium nitrate and potassium nitrate.
The present invention also provides the T7 steel that a kind of intensifying method according to T7 steel described previously is prepared.
According to above-mentioned technical proposal, intensifying method of the invention includes：By the steel billet of T7 materials in the atmosphere containing nitrogen
Under the step of being heat-treated, then being cooled down；Wherein, the heat treatment includes the first temperature section, second temperature section, third temperature
Section and the 4th temperature section；Wherein, the temperature of the first temperature section is 780-820 DEG C, and second temperature section temperature is 620-650 DEG C, the
The temperature of three temperature sections is 830-850 DEG C, and the temperature of the 4th temperature section is 780-800 DEG C；Wherein, with volume content percentage
It counts, the content of nitrogen is not less than 30% in the first temperature section atmosphere, and the content of nitrogen is not less than 50% in second temperature section atmosphere,
The content of nitrogen is not less than 60% in third temperature section atmosphere, and the content of nitrogen is not less than 80% in the 4th temperature section atmosphere；Its
In, the step of cooling, carries out in the aqueous solution containing sodium nitrate and potassium nitrate.The T7 steel intensifying method processing steps are simple, hold
It is easy to control, higher reinforcing layer thickness can be obtained within the shorter activity duration, the T7 steel after reinforcing can significantly improve firmly
Degree, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, and further improves the use of T7 steel product
Service life.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Specific embodiment
The specific embodiment of the present invention is described in detail below.It is it should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood to comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It between the endpoint value of a range and individual point value and can be individually combined with each other between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
The present invention provides a kind of intensifying method of T7 steel, and the intensifying method includes the steel billet of T7 materials containing nitrogen
Atmosphere under the step of being heat-treated, then being cooled down；Wherein, the heat treatment includes the first temperature section, second temperature section, the
Three temperature sections and the 4th temperature section；Wherein, the temperature of the first temperature section is 780-820 DEG C, and second temperature section temperature is 620-650
DEG C, the temperature of third temperature section is 830-850 DEG C, and the temperature of the 4th temperature section is 780-800 DEG C；Wherein, with volume content hundred
Score meter, the content of nitrogen is not less than 30% in the first temperature section atmosphere, and the content of nitrogen is not less than in second temperature section atmosphere
50%, the content of nitrogen is not less than 60% in third temperature section atmosphere, and the content of nitrogen is not less than in the 4th temperature section atmosphere
80%；Wherein, the step of cooling carries out in the aqueous solution containing sodium nitrate and potassium nitrate.
According to above-mentioned technical proposal, intensifying method of the invention includes：By the steel billet of T7 materials in the atmosphere containing nitrogen
Under the step of being heat-treated, then being cooled down；Wherein, the heat treatment includes the first temperature section, second temperature section, third temperature
Section and the 4th temperature section；Wherein, the temperature of the first temperature section is 780-820 DEG C, and second temperature section temperature is 620-650 DEG C, the
The temperature of three temperature sections is 830-850 DEG C, and the temperature of the 4th temperature section is 780-800 DEG C；Wherein, with volume content percentage
It counts, the content of nitrogen is not less than 30% in the first temperature section atmosphere, and the content of nitrogen is not less than 50% in second temperature section atmosphere,
The content of nitrogen is not less than 60% in third temperature section atmosphere, and the content of nitrogen is not less than 80% in the 4th temperature section atmosphere；Its
In, the step of cooling, carries out in the aqueous solution containing sodium nitrate and potassium nitrate.The T7 steel intensifying method processing steps are simple, hold
It is easy to control, higher reinforcing layer thickness can be obtained within the shorter activity duration, the T7 steel after reinforcing can significantly improve firmly
Degree, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, and further improves the use of T7 steel product
Service life.
The selection of T7 steel used in the present invention complies with standard the regulation in GB/T1299, and ingredient is calculated in mass percent,
Contain C：0.65~0.74%, Si：≤ 0.35%, Mn：≤ 0.40%, Cr：≤ 0.030%, W：≤ 0.035%, P, S are harmful to member
Cellulose content meets GB/T1299, surplus Fe.
In a kind of preferred embodiment of the present invention, in order to make the T7 steel intensifying method processing steps simple, hold
It is easy to control, T7 steel can be made to obtain higher reinforcing layer thickness within the shorter activity duration, the T7 steel after reinforcing can be notable
Hardness is improved, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, it is preferable that the heat treatment is negative
It is carried out under pressure ambient conditions, wherein, pressure is (- 0.02)-(- 0.04) Mpa.
In a kind of preferred embodiment of the present invention, in order to make the T7 steel intensifying method processing steps simple, hold
It is easy to control, T7 steel can be made to obtain higher reinforcing layer thickness within the shorter activity duration, the T7 steel after reinforcing can be notable
Hardness is improved, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, it is preferable that described containing nitrogen
Atmosphere further includes carbon dioxide and ammonia.
In a kind of preferred embodiment of the present invention, in order to make the T7 steel intensifying method processing steps simple, hold
It is easy to control, T7 steel can be made to obtain higher reinforcing layer thickness within the shorter activity duration, the T7 steel after reinforcing can be notable
Hardness is improved, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, it is further preferred that nitrogen, dioxy
Change the sum of volume content of carbon and ammonia and be not less than 99%.
In a kind of preferred embodiment of the present invention, in order to make the T7 steel intensifying method processing steps simple, hold
It is easy to control, T7 steel can be made to obtain higher reinforcing layer thickness within the shorter activity duration, the T7 steel after reinforcing can be notable
Hardness is improved, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, it is preferable that carbon dioxide and ammonia
Volume content ratio be 1：2-3.
In a kind of preferred embodiment of the present invention, in order to make the T7 steel intensifying method processing steps simple, hold
It is easy to control, T7 steel can be made to obtain higher reinforcing layer thickness within the shorter activity duration, the T7 steel after reinforcing can be notable
Hardness is improved, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, it is preferable that the first temperature section atmosphere
The volume content of middle nitrogen is 30-40%.
In a kind of preferred embodiment of the present invention, in order to make the T7 steel intensifying method processing steps simple, hold
It is easy to control, T7 steel can be made to obtain higher reinforcing layer thickness within the shorter activity duration, the T7 steel after reinforcing can be notable
Hardness is improved, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, it is preferable that second temperature section atmosphere
The volume content of middle nitrogen is 50-60%.
In a kind of preferred embodiment of the present invention, in order to make the T7 steel intensifying method processing steps simple, hold
It is easy to control, T7 steel can be made to obtain higher reinforcing layer thickness within the shorter activity duration, the T7 steel after reinforcing can be notable
Hardness is improved, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, it is preferable that third temperature section atmosphere
The volume content of middle nitrogen is 60-70%.
In a kind of preferred embodiment of the present invention, in order to make the T7 steel intensifying method processing steps simple, hold
It is easy to control, T7 steel can be made to obtain higher reinforcing layer thickness within the shorter activity duration, the T7 steel after reinforcing can be notable
Hardness is improved, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, it is preferable that the 4th temperature section atmosphere
The volume content of middle nitrogen is 80-90%.
In a kind of preferred embodiment of the present invention, in order to make the T7 steel intensifying method processing steps simple, hold
It is easy to control, T7 steel can be made to obtain higher reinforcing layer thickness within the shorter activity duration, the T7 steel after reinforcing can be notable
Hardness is improved, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, it is preferable that the place of the first temperature section
The reason time is 1-2.5h, and processing time of second temperature section is 2-3h, and processing time of third temperature section is 2-4h, the first temperature
The processing time of section is 3-5h.
In a kind of preferred embodiment of the present invention, in order to make the T7 steel intensifying method processing steps simple, hold
It is easy to control, T7 steel can be made to obtain higher reinforcing layer thickness within the shorter activity duration, the T7 steel after reinforcing can be notable
Hardness is improved, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, it is preferable that sodium nitrate in aqueous solution
Mass concentration ratio with potassium nitrate is 1：1-0.8.
In a kind of preferred embodiment of the present invention, in order to make the T7 steel intensifying method processing steps simple, hold
It is easy to control, T7 steel can be made to obtain higher reinforcing layer thickness within the shorter activity duration, the T7 steel after reinforcing can be notable
Hardness is improved, moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, it is preferable that the quality of sodium nitrate is dense
It spends for 15-20g/L.
The present invention also provides the T7 steel that a kind of intensifying method according to T7 steel described previously is prepared.
According to above-mentioned technical proposal, intensifying method of the invention is included the steel billet of T7 materials under the atmosphere containing nitrogen
The step of being heat-treated, then being cooled down；Wherein, the heat treatment includes the first temperature section, second temperature section, third temperature section
With the 4th temperature section；Wherein, the temperature of the first temperature section is 780-820 DEG C, and second temperature section temperature is 620-650 DEG C, third
The temperature of temperature section is 830-850 DEG C, and the temperature of the 4th temperature section is 780-800 DEG C；Wherein, in terms of volume content percentage,
The content of nitrogen is not less than 40% in first temperature section atmosphere, and the content of nitrogen is not less than 60% in second temperature section atmosphere, and the
The content of nitrogen is not less than 70% in three temperature section atmosphere, and the content of nitrogen is not less than 90% in the 4th temperature section atmosphere, wherein,
The step of cooling, carries out in the aqueous solution containing sodium nitrate and potassium nitrate.The T7 steel intensifying method processing steps are simple, easily
Control, can obtain higher reinforcing layer thickness within the shorter activity duration, and the T7 steel after reinforcing can significantly improve hardness,
Moreover, the hardness of the matrix in addition to strengthening layer also gets a promotion, and further improve T7 steel product uses the longevity
Life.
The present invention will be described in detail by way of examples below.In following embodiment,
Embodiment 1
The intensifying method of T7 steel：Including the steel billet of T7 materials is heat-treated under the atmosphere containing nitrogen, then drop
The step of temperature；The heat treatment carries out under negative pressure ambient conditions, wherein, pressure is (- 0.02) Mpa；Wherein, the heat treatment
Including the first temperature section, second temperature section, third temperature section and the 4th temperature section；Wherein, the temperature of the first temperature section is 780
DEG C, second temperature section temperature is 620 DEG C, and the temperature of third temperature section is 830 DEG C, and the temperature of the 4th temperature section is 780 DEG C；Its
In, processing time of the first temperature section is 2.5h, and the processing time of second temperature section is 3h, and the processing time of third temperature section is
4h, the processing time of the first temperature section is 5h；
Wherein, in terms of volume content percentage, the content of nitrogen is 40% in the first temperature section atmosphere, second temperature section atmosphere
The content for enclosing middle nitrogen is 60%, and the content of nitrogen is 70% in third temperature section atmosphere, nitrogen in the 4th temperature section atmosphere
Content 90%；The atmosphere containing nitrogen further includes carbon dioxide and ammonia, the volume content of nitrogen, carbon dioxide and ammonia
The sum of be not less than 99%；The volume content of carbon dioxide and ammonia ratio is 1：2；
Wherein, the step of cooling carries out in the aqueous solution containing sodium nitrate and potassium nitrate, sodium nitrate and nitre in aqueous solution
The mass concentration ratio of sour potassium is 1：1；Wherein, the mass concentration of sodium nitrate is 15g/L.
Embodiment 2
The intensifying method of T7 steel：Including the steel billet of T7 materials is heat-treated under the atmosphere containing nitrogen, then drop
The step of temperature；The heat treatment carries out under negative pressure ambient conditions, wherein, pressure is (- 0.04) Mpa；Wherein, the heat treatment
Including the first temperature section, second temperature section, third temperature section and the 4th temperature section；Wherein, the temperature of the first temperature section is 820
DEG C, second temperature section temperature is 650 DEG C, and the temperature of third temperature section is 850 DEG C, and the temperature of the 4th temperature section is 800 DEG C；Its
In, processing time of the first temperature section is 1h, and the processing time of second temperature section is 2h, and the processing time of third temperature section is
2h, the processing time of the first temperature section is 3h；
Wherein, in terms of volume content percentage, the content of nitrogen is 30% in the first temperature section atmosphere, second temperature section atmosphere
The content for enclosing middle nitrogen is 50%, and the content of nitrogen is 60% in third temperature section atmosphere, nitrogen in the 4th temperature section atmosphere
Content 80%；The atmosphere containing nitrogen further includes carbon dioxide and ammonia, the volume content of nitrogen, carbon dioxide and ammonia
The sum of be not less than 99%；The volume content of carbon dioxide and ammonia ratio is 1：3；
Wherein, the step of cooling carries out in the aqueous solution containing sodium nitrate and potassium nitrate, sodium nitrate and nitre in aqueous solution
The mass concentration ratio of sour potassium is 1：0.8；Wherein, the mass concentration of sodium nitrate is 20g/L.
Embodiment 3
The intensifying method of T7 steel：Including the steel billet of T7 materials is heat-treated under the atmosphere containing nitrogen, then drop
The step of temperature；The heat treatment carries out under negative pressure ambient conditions, wherein, pressure is (- 0.03) Mpa；Wherein, the heat treatment
Including the first temperature section, second temperature section, third temperature section and the 4th temperature section；Wherein, the temperature of the first temperature section is 800
DEG C, second temperature section temperature is 635 DEG C, and the temperature of third temperature section is 820 DEG C, and the temperature of the 4th temperature section is 790 DEG C；Its
In, processing time of the first temperature section is 1.8h, and processing time of second temperature section is 2.5h, the processing time of third temperature section
For 3h, the processing time of the first temperature section is 4h；
Wherein, in terms of volume content percentage, the content of nitrogen is 35% in the first temperature section atmosphere, second temperature section atmosphere
The content for enclosing middle nitrogen is 55%, and the content of nitrogen is 65% in third temperature section atmosphere, nitrogen in the 4th temperature section atmosphere
Content 85%；The atmosphere containing nitrogen further includes carbon dioxide and ammonia, the volume content of nitrogen, carbon dioxide and ammonia
The sum of be not less than 99%；The volume content of carbon dioxide and ammonia ratio is 1：2.5；Heat treatment process carries out in nitriding case；
Wherein, the step of cooling carries out in the aqueous solution containing sodium nitrate and potassium nitrate, sodium nitrate and nitre in aqueous solution
The mass concentration ratio of sour potassium is 1：0.9；Wherein, the mass concentration of sodium nitrate is 18g/L.
Comparative example 1
The intensifying method of T7 steel：The steel billet of T7 materials under the atmosphere containing nitrogen is heat-treated, is then cooled down
Step；The heat treatment carries out under negative pressure ambient conditions, wherein, pressure is (- 0.03) Mpa；Wherein, the heat treatment process
For the content 85% of the nitrogen in 800 DEG C of heat preservation 11.3h, atmosphere, the atmosphere containing nitrogen further includes carbon dioxide and ammonia
The sum of gas, the volume content of nitrogen, carbon dioxide and ammonia is not less than 99%；The volume content of carbon dioxide and ammonia ratio is 1：
2.5；
Wherein, the step of cooling carries out in the aqueous solution containing sodium nitrate and potassium nitrate, sodium nitrate and nitre in aqueous solution
The mass concentration ratio of sour potassium is 1：0.9；Wherein, the mass concentration of sodium nitrate is 18g/L.
Comparative example 2
The intensifying method of T7 steel：Including the steel billet of T7 materials is heat-treated under the atmosphere containing nitrogen, then drop
The step of temperature；The heat treatment carries out under negative pressure ambient conditions, and pressure is (- 0.03) Mpa；Wherein, the heat treatment process
For the content 85% of the nitrogen in 635 DEG C of heat preservation 11.3h, atmosphere, the atmosphere containing nitrogen further includes carbon dioxide and ammonia
The sum of gas, the volume content of nitrogen, carbon dioxide and ammonia is not less than 99%；The volume content of carbon dioxide and ammonia ratio is 1：
2.5；
Wherein, the step of cooling carries out in the aqueous solution containing sodium nitrate and potassium nitrate, sodium nitrate and nitre in aqueous solution
The mass concentration ratio of sour potassium is 1：0.9；Wherein, the mass concentration of sodium nitrate is 18g/L.
Comparative example 3
The intensifying method of T7 steel：Including the steel billet of T7 materials is heat-treated under the atmosphere containing nitrogen, then drop
The step of temperature；The heat treatment carries out under negative pressure ambient conditions, wherein, pressure is (- 0.03) Mpa；Wherein, the heat treatment
Process is that 11.3h is kept the temperature at 635 DEG C, and the content 85% of nitrogen, the atmosphere containing nitrogen further include carbon dioxide in atmosphere
And the sum of ammonia, the volume content of nitrogen, carbon dioxide and ammonia is not less than 99%；The volume content of carbon dioxide and ammonia ratio
It is 1：2.5；
Wherein, the step of cooling carries out in the aqueous solution containing sodium nitrate and potassium nitrate, sodium nitrate and nitre in aqueous solution
The mass concentration ratio of sour potassium is 1：0.9；Wherein, the mass concentration of sodium nitrate is 18g/L.
Comparative example 4
The intensifying method of T7 steel：Including the steel billet of T7 materials is heat-treated under the atmosphere containing nitrogen, then drop
The step of temperature；The heat treatment carries out under negative pressure ambient conditions, wherein, pressure is (- 0.03) Mpa；Wherein, the heat treatment
Process is that 11.3h is kept the temperature at 790 DEG C, and the content 90% of nitrogen, the atmosphere containing nitrogen further include argon gas, nitrogen in atmosphere
It is 100% with the sum of the volume content of argon gas；Wherein, the step of cooling in the aqueous solution containing sodium nitrate and potassium nitrate into
It goes, the mass concentration ratio of sodium nitrate and potassium nitrate is 1 in aqueous solution：0.9；Wherein, the mass concentration of sodium nitrate is 18g/L.
Detect example 1
After testing, in embodiment 1-3 the strengthening layer of sample thickness, at 15 microns or more.And in the prior art, strengthen
Layer at least needs to keep the temperature logical nitrogen 25h to reaching 15 microns, and applies the intensifying method of the present invention, enhanced time 15h with
Under, the production time for strengthening T7 steel and production cost is greatly saved.
Detect example 2
By the sample in embodiment 1-3 and comparative example 1-4 according to GB/T230.1-2009 detection Rockwell hardness (HRC), hair
The hardness in sample in current embodiment 1-3 and comparative example 1-4 is not much different, in the range of 51-54HRC.
Sample is gone into upper surface in water cooling cutting, 0.5mm, 1mm, 2mm is cut respectively, detects cutting face again
Rockwell hardness (HRC), it is found that with the increase of cutting degree, the hardness of sample is declining, the HRC of the sample in comparative example
Decline significantly, only in 28-30HRC.And although the HRC of the sample in embodiment 1-3 is also declined, cut 2mm after, examination
The hardness of sample can still reach 44HRC, and minimum also has 39HRC.
To sum up, T7 steel intensifying method of the invention can obtain higher reinforcing thickness within the shorter activity duration
Degree, the T7 steel after reinforcing can significantly improve hardness, and the hardness of the matrix in addition to strengthening layer also gets a promotion, can be into one
Step improves the service life of T7 steel product.Moreover, T7 steel intensifying method of the invention can be saved the production time, reduce strong
Change the production cost of T7 steel.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail, within the scope of the technical concept of the present invention, a variety of simple variants can be carried out to technical scheme of the present invention, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (10)
1. a kind of intensifying method of T7 steel, which is characterized in that this method includes：By the steel billet of T7 materials in the atmosphere containing nitrogen
Under the step of being heat-treated, then being cooled down；Wherein, the heat treatment includes the first temperature section, second temperature section, third temperature
Section and the 4th temperature section；Wherein, the temperature of the first temperature section is 780-820 DEG C, and second temperature section temperature is 620-650 DEG C, the
The temperature of three temperature sections is 830-850 DEG C, and the temperature of the 4th temperature section is 780-800 DEG C；
Wherein, in terms of volume content percentage, the content of nitrogen is not less than 30% in the first temperature section atmosphere, second temperature section atmosphere
The content of middle nitrogen is enclosed not less than 50%, and the content of nitrogen is not less than 60% in third temperature section atmosphere, the 4th temperature section atmosphere
The content of middle nitrogen is not less than 80%；
Wherein, the step of cooling carries out in the aqueous solution containing sodium nitrate and potassium nitrate.
2. the intensifying method of T7 steel according to claim 1, wherein, the heat treatment carries out under negative pressure ambient conditions,
Wherein, pressure is (- 0.02)-(- 0.04) Mpa.
3. the intensifying method of T7 steel according to claim 1, wherein, the atmosphere containing nitrogen further includes carbon dioxide
And ammonia；Preferably,
The sum of volume content of nitrogen, carbon dioxide and ammonia is not less than 99%.
4. the intensifying method of T7 steel according to claim 3, wherein, the volume content ratio of carbon dioxide and ammonia is 1：2-
3。
5. the intensifying method of T7 steel according to claim 4, wherein, the volume content of nitrogen is in the first temperature section atmosphere
30-40%.
6. the intensifying method of T7 steel according to claim 4, wherein, the volume content of nitrogen is in second temperature section atmosphere
50-60%.
7. the intensifying method of T7 steel according to claim 4, wherein, the volume content of nitrogen is in third temperature section atmosphere
60-70%；And/or
The volume content of nitrogen is 80-90% in 4th temperature section atmosphere.
8. the intensifying method of T7 steel according to claim 1, wherein, the processing time of the first temperature section is 1-2.5h, the
The processing time of two temperature sections is 2-3h, and the processing time of third temperature section is 2-4h, and the processing time of the first temperature section is 3-
5h。
9. the intensifying method of T7 steel according to claim 1, wherein, the mass concentration of sodium nitrate and potassium nitrate in aqueous solution
Than being 1：1-0.8；Preferably, the mass concentration of sodium nitrate is 15-20g/L.
10. a kind of T7 steel that intensifying method according to any one of the claim 1-9 T7 steel is prepared.
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| CN104831188A (en) * | 2015-03-30 | 2015-08-12 | 北京中科普金特种材料技术发展有限公司 | Heat treatment method of 304 type antibacterial stainless steel plate strip |
| CN105525192A (en) * | 2015-12-14 | 2016-04-27 | 浙江海洋学院 | Anti-corrosion stainless steel plate for boat anchor and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1214370A (en) * | 1997-10-15 | 1999-04-21 | 胥立华 | Heat treatment process of cutter for stone work |
| JP2002060845A (en) * | 2000-08-09 | 2002-02-28 | Yamanashi Prefecture | Method for prolonging service life of die casting die |
| CN102747316A (en) * | 2012-07-30 | 2012-10-24 | 鹰普航空零部件（无锡）有限公司 | Salt bath nitriding pre-treatment and gas nitriding complex heat treatment process of anti-corrosion stainless steel parts |
| CN104831188A (en) * | 2015-03-30 | 2015-08-12 | 北京中科普金特种材料技术发展有限公司 | Heat treatment method of 304 type antibacterial stainless steel plate strip |
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