CN108823502A - A kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear - Google Patents
A kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear Download PDFInfo
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- CN108823502A CN108823502A CN201810891433.9A CN201810891433A CN108823502A CN 108823502 A CN108823502 A CN 108823502A CN 201810891433 A CN201810891433 A CN 201810891433A CN 108823502 A CN108823502 A CN 108823502A
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- bevel gear
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- 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
-
- 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
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
-
- 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
- C21D2211/008—Martensite
Abstract
The present invention provides a kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear, and spiral bevel gear chemical element component and its mass percentage are C：0.24%~0.32%, Si：0.17%~0.37%, Mn：0.8%~1.3%, Cr：1.0%~1.3%, Ti：0.04%~0.12%, P<0.035%, S<0.035%, the surplus is iron, by after anti-carburizi ng processing, carburizing, heat preservation, two-stage quenching, normalized treatment, tempering through over mechanical processing be made a kind of high intensity, high impact toughness, high tensile property the passive inclined screw bevel gear of 30CrMnTi steel.
Description
Technical field
The present invention relates to the processing technique field of mechanical part, in particular to a kind of 30CrMnTi steel large-scale spiral bevel gear
Heat treatment process.
Background technique
Recently as the development of national economy, axis class, the demand of spiral bevel gear wheel-class parts are more and more, the service life and
Bearing capacity directly affects the economic benefit of machinery production producer, improves axis class, the bearing capacity of spiral bevel gear wheel-class parts
It is more and more important in machinery industry with service life.Common spiral bevel gear, axis and carburizing part need to after forging, cutting,
The heat treatment of the techniques such as normalizing, carburizing and quenching and lonneal is carried out again, has obtained that superficial layer is hard carburized layer, center portion is tool
There is the tissue of favorable comprehensive mechanical property, contains martensite, retained austenite and massive carbide etc. in structure organization, these
The residual stress that tissue and quenching generate has decision to make the mechanical property such as hardness, torsional strength etc. of axis and carburizing part
With.
Intensity, the harden ability of 30CrMnTi steel ratio 20CrMnTi steel are high, but impact flexibility is slightly lower.Carburizing steel is mainly used as,
Can cool down direct quenching after carburizing, and bending strength is higher, wear-resisting property is good.It can use, cut after quenched low-temperature is tempered or is quenched
It is medium to cut processability.For manufacturing the biggish heavy load carburizing part in Tractor Industry middle section and the biggish gear of stress, gear
Axis, worm screw etc..
Large-scale spiral bevel gear is needed in cyclic loading, shock loading, very large contacting stress and under conditions of be seriously worn
Work, therefore it is required that surface is hard and wear-resisting, center portion is strong and tough, has high fatigue limit.Therefore, it is necessary to optimize 30CrMnTi
Steel heat treatment process, prepare high intensity, high impact toughness, high tensile property large-scale spiral bevel gear.
Summary of the invention
The purpose of the present invention is to provide a kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear, it is intended to prepare
Out high intensity, high impact toughness, high tensile property passive inclined screw bevel gear.
The present invention provides a kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear, and the 30CrMnTi steel is passive
Inclined screw bevel gear chemical element component and its mass percentage are：C：0.24%~0.32%, Si：0.17%~
0.37%, Mn：0.8%~1.3%, Cr：1.0%~1.3%, Ti：0.04%~0.12%, P<0.035%, S<0.035%,
The surplus is iron, and the heat treatment process includes the following steps：
S1：Preparatory process：By spiral bevel gear forging cleaning, drying, the disc between the gear teeth of spiral bevel gear is carried out
Anti-carburizi ng processing；
S2：Carburizing：The mode for using temperature heating, is heated to 950-1100 DEG C to gas carbruizing furance, by spiral bevel gear
Vertical pile enters in furnace, and exhaust keeps the temperature 2.5h, and kerosene 160-180 drop/minute is dripped when heat preservation, and infiltration layer cools to after reaching requirement
860±10℃；
S3：Heat preservation：Keep the temperature soaking 2h；
S4：Two-stage quenching：Calcium chloride solution is dipped vertically by spiral bevel gear at a temperature of between 850-870 DEG C
In, by spiral bevel gear rapid cooling to after 200-260 DEG C, spiral bevel gear is warming up to 680-750 DEG C, keeps the temperature 1h, then will
Spiral bevel gear, which immerses in liquid nitrogen, is quenched to -20 DEG C -0 DEG C；
S5：It is cleaned and dried：Spray cleaning solution cleaning is carried out to spiral bevel gear, the calcium chloride for washing away spiral bevel gear wheel surface is molten
It is dry after liquid, then protection by spraying aqueous preventives liquid；
S6：Normalized treatment；
S7：Through over mechanical processing finished product spiral bevel gear after tempering.
As a further improvement of the present invention, the calcium chloride cool time is 4-8s in step S4, and the Quenching in liquid nitrogen time is 10-
20s。
As a further improvement of the present invention, the calcium chloride cool time is 6s in step S4, and the Quenching in liquid nitrogen time is 15s.
As a further improvement of the present invention, the wheel teeth portion matrix of the passive inclined screw bevel gear of 30CrMnTi steel is superfine
Acicular martensite, for residual austenite content 2.25~2.6%, center portion matrix is thinner lath martensite, retained austenite
Content is 8~12%.
As a further improvement of the present invention, the retained austenite of the passive inclined screw bevel gear of 30CrMnTi steel recrystallizes
Grain size number is 13-15 grades.
Compared with prior art, the invention has the advantages that：
1. two-stage quenching technical of the invention is pressed for the first time using calcium chloride solution as quenching medium, rapidly make spiral bevel gear
It cools, the austenite on surface layer is made to change martensite, the volume expansion on surface layer forms pressure on the surface layer of spiral bevel gear and answers
Power reduces the generation of hardening flaw, then makes remnants in 30CrMnTi steel spiral bevel gear by way of being warming up to 680-750 DEG C
The recrystallization of austenite further refines spiral bevel gear interior tissue, finally using Quenching in liquid nitrogen to subzero, spiral umbrella
The retained austenite of gear is further converted into martensite, the gear teeth of the passive inclined screw bevel gear of final 30CrMnTi steel obtained
Portion's residual austenite content significantly improves spiral bevel gear hardness, intensity, impact flexibility and tensile property 2.25~2.6%.
2. the present invention uses and first passes through this maximum quenching medium of cooling velocity at 600 DEG C of calcium chloride solution to spiral umbrella
Gear carries out short time pole cold quenching, refines metal grain, by being quenched again using the liquid nitrogen further long period after recrystallization,
The wheel portion matrix for being achieved in that spiral bevel gear is superfine acicular martensite, and center portion matrix is thinner lath martensite, residual
The grain size of remaining austenite reaches higher level, and crystal grain is tiny, and tissue line succession is high, and yield strength is big, can improve spiral shell
The intensity of rotation bevel gear can improve the tensile property and toughness of spiral bevel gear again.
3. on the one hand the temperature-rise period in two-stage quenching technical of the present invention recrystallizes retained austenite, on the other hand
A part of martensite transfor mation is austenite, increases the remnants of the content of retained austenite in spiral bevel gear, especially center portion
The content of austenite, the residual austenite content of wheel portion is 2.25~2.6%, and the content of the retained austenite of center portion is remaining difficult to understand
Family name's body content is 10~15%, the wheel teeth portion hardness with higher of the spiral bevel gear of this structure, wearability and anti-
High temperature hot tearing performance, center portion impact flexibility with higher and shock resistance.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with specific embodiment.Obviously, described
Embodiment be only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiment of the present invention, ability
Domain those of ordinary skill every other embodiment obtained without creative efforts, belongs to guarantor of the present invention
The range of shield.
The present invention discloses a kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear, and specific embodiment is such as
Under.
Embodiment 1
A kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear, the passive inclined screw bevel gear of 30CrMnTi steel
It learns elemental composition and its mass percentage is：C：0.24%, Si：0.17%, Mn：0.8%, Cr：1.0%, Ti：0.04%, P
<0.035%, S<0.035%, the surplus is iron, and the heat treatment process includes the following steps：
S1：Preparatory process：By spiral bevel gear forging cleaning, drying, the disc between the gear teeth of spiral bevel gear is carried out
Anti-carburizi ng processing；
S2：Carburizing：The mode for using temperature heating, is heated to 950-1100 DEG C to gas carbruizing furance, by spiral bevel gear
Vertical pile enters in furnace, and exhaust keeps the temperature 2.5h, and kerosene 160-180 drop/minute is dripped when heat preservation, and infiltration layer cools to after reaching requirement
860±10℃；
S3：Heat preservation：Keep the temperature soaking 2h；
S4：Two-stage quenching：Calcium chloride solution is dipped vertically by spiral bevel gear at a temperature of between 850-870 DEG C
In, after spiral bevel gear rapid cooling 4s to 200-260 DEG C, spiral bevel gear is warming up to 680-750 DEG C, keeps the temperature 1h, then
Spiral bevel gear is immersed and quenches 10s to -20 DEG C -0 DEG C in liquid nitrogen；
S5：It is cleaned and dried：Spray cleaning solution cleaning is carried out to spiral bevel gear, the calcium chloride for washing away spiral bevel gear wheel surface is molten
It is dry after liquid, then protection by spraying aqueous preventives liquid；
S6：Normalized treatment；
S7：Through over mechanical processing finished product spiral bevel gear after tempering.
The wheel teeth portion matrix of the passive inclined screw bevel gear of 30CrMnTi steel is superfine acicular martensite after testing, remaining
Austenite content is 2.6%, and center portion matrix is thinner lath martensite, and residual austenite content is in 8%, 30CrMnTi steel quilt
The grain size number of the retained austenite recrystallization of dynamic inclined screw bevel gear is 15 grades.
Embodiment 2
A kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear, the passive inclined screw bevel gear of 30CrMnTi steel
It learns elemental composition and its mass percentage is：C：0.32%, Si：0.37%, Mn：1.3%, Cr：1.3%, Ti：0.12%, P
<0.035%, S<0.035%, the surplus is iron, and the heat treatment process includes the following steps：
S1：Preparatory process：By spiral bevel gear forging cleaning, drying, the disc between the gear teeth of spiral bevel gear is carried out
Anti-carburizi ng processing；
S2：Carburizing：The mode for using temperature heating, is heated to 950-1100 DEG C to gas carbruizing furance, by spiral bevel gear
Vertical pile enters in furnace, and exhaust keeps the temperature 2.5h, and kerosene 160-180 drop/minute is dripped when heat preservation, and infiltration layer cools to after reaching requirement
860±10℃；
S3：Heat preservation：Keep the temperature soaking 2h；
S4：Two-stage quenching：Calcium chloride solution is dipped vertically by spiral bevel gear at a temperature of between 850-870 DEG C
In, after spiral bevel gear rapid cooling 8s to 200-260 DEG C, spiral bevel gear is warming up to 680-750 DEG C, keeps the temperature 1h, then
Spiral bevel gear is immersed and quenches 20s to -20 DEG C -0 DEG C in liquid nitrogen；
S5：It is cleaned and dried：Spray cleaning solution cleaning is carried out to spiral bevel gear, the calcium chloride for washing away spiral bevel gear wheel surface is molten
It is dry after liquid, then protection by spraying aqueous preventives liquid；
S6：Normalized treatment；
S7：Through over mechanical processing finished product spiral bevel gear after tempering.
The wheel teeth portion matrix of the passive inclined screw bevel gear of the 30CrMnTi steel is superfine acicular martensite after testing,
For residual austenite content 2.25%, center portion matrix is thinner lath martensite, residual austenite content 12%,
The grain size number of the retained austenite recrystallization of the passive inclined screw bevel gear of 30CrMnTi steel is 13 grades.
Embodiment 3
A kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear, the passive inclined screw bevel gear of 30CrMnTi steel
It learns elemental composition and its mass percentage is：C：0.30%, Si：0.23%, Mn：0.9%, Cr：1.2%, Ti：0.08%, P
<0.035%, S<0.035%, the surplus is iron, and the heat treatment process includes the following steps：
S1：Preparatory process：By spiral bevel gear forging cleaning, drying, the disc between the gear teeth of spiral bevel gear is carried out
Anti-carburizi ng processing；
S2：Carburizing：The mode for using temperature heating, is heated to 950-1100 DEG C to gas carbruizing furance, by spiral bevel gear
Vertical pile enters in furnace, and exhaust keeps the temperature 2.5h, and kerosene 160-180 drop/minute is dripped when heat preservation, and infiltration layer cools to after reaching requirement
860±10℃；
S3：Heat preservation：Keep the temperature soaking 2h；
S4：Two-stage quenching：Calcium chloride solution is dipped vertically by spiral bevel gear at a temperature of between 850-870 DEG C
In, after spiral bevel gear rapid cooling 6s to 200-260 DEG C, spiral bevel gear is warming up to 680-750 DEG C, keeps the temperature 1h, then
Spiral bevel gear is immersed and quenches 15s to -20 DEG C -0 DEG C in liquid nitrogen；
S5：It is cleaned and dried：Spray cleaning solution cleaning is carried out to spiral bevel gear, the calcium chloride for washing away spiral bevel gear wheel surface is molten
It is dry after liquid, then protection by spraying aqueous preventives liquid；
S6：Normalized treatment；
S7：Through over mechanical processing finished product spiral bevel gear after tempering.
After testing, the wheel teeth portion matrix of the passive inclined screw bevel gear of 30CrMnTi steel is superfine acicular martensite, residual
Remaining austenite content is 2.4%, and center portion matrix is thinner lath martensite, and residual austenite content is in 10%, 30CrMnTi
The grain size number of the retained austenite recrystallization of the passive inclined screw bevel gear of steel is 14 grades.
Table 1 is the hardness and mechanical experimental results of large-scale spiral bevel gear.
The performance indicator of 1 large-scale spiral bevel gear of table
Embodiment 1-3's the result shows that, large-scale spiral bevel gear provided by the invention by calcium chloride solution it is this 600
DEG C when the maximum quenching medium of cooling velocity to large-scale spiral bevel gear carry out short time pole cold quenching, refine metal grain, pass through
It is achieved in that the wheel portion matrix of large-scale spiral bevel gear is superfine using the further long period quenching of liquid nitrogen again after recrystallization
Acicular martensite, center portion matrix are thinner lath martensite, and the grain size of retained austenite reaches higher level, and crystal grain is thin
Small, tissue line succession is high, and yield strength is big, can improve the intensity of large-scale spiral bevel gear but also improve large-scale spiral umbrella
The tensile property and toughness of gear, therefore large-scale spiral bevel gear of the invention has high rigidity, high tensile/yield strength and height
Impact flexibility.
Above to a kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear provided by the present invention.It answers herein
With specific embodiment, principle and implementation of the present invention are described, and the explanation of above example is only intended to help
Understand method and its core concept of the invention.It should be pointed out that for those skilled in the art, not taking off
, can be with several improvements and modifications are made to the present invention under the premise of from the principle of the invention, these improvement and modification also fall into this
In invention scope of protection of the claims.
Claims (5)
1. a kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear, it is characterised in that：The 30CrMnTi steel is passive
Inclined screw bevel gear chemical element component and its mass percentage are：C：0.24%~0.32%, Si：0.17%~
0.37%, Mn：0.8%~1.3%, Cr：1.0%~1.3%, Ti：0.04%~0.12%, P<0.035%, S<0.035%,
The surplus is iron, and the heat treatment process includes the following steps：
S1：Preparatory process：By spiral bevel gear forging cleaning, drying, the disc between spiral bevel gear is carried out at anti-carburizi ng
Reason；
S2：Carburizing：The mode for using temperature heating vertically folds spiral bevel gear to 950-1100 DEG C of gas carburizing stove heating
It is put into furnace, is vented, keep the temperature 2.5h, kerosene 160-180 drop/minute is dripped when heat preservation, infiltration layer cools to 860 ± 10 after reaching requirement
℃；
S3：Heat preservation：Keep the temperature soaking 2h；
S4：Two-stage quenching：It is dipped vertically into calcium chloride solution at a temperature of between 850-870 DEG C to by spiral bevel gear, it will
Spiral bevel gear is warming up to 680-750 DEG C to after 200-260 DEG C by spiral bevel gear rapid cooling, keeps the temperature 1h, then by spiral umbrella
Gear, which immerses in liquid nitrogen, is quenched to -20 DEG C -0 DEG C；
S5：It is cleaned and dried：Spray cleaning solution cleaning is carried out to spiral bevel gear, washes away the calcium chloride solution of spiral bevel gear wheel surface,
It is dry after protection by spraying aqueous preventives liquid again；
S6：Normalized treatment；
S7：Through over mechanical processing finished product spiral bevel gear after tempering.
2. a kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear according to claim 1, it is characterised in that：
The calcium chloride cool time is 4-8s in step S4, and the Quenching in liquid nitrogen time is 10-20s.
3. a kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear according to claim 1, it is characterised in that：
The calcium chloride cool time is 6s in step S4, and the Quenching in liquid nitrogen time is 15s.
4. a kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear according to claim 1, it is characterised in that：
The wheel teeth portion matrix of the passive inclined screw bevel gear of 30CrMnTi steel is superfine acicular martensite, and residual austenite content exists
2.25~2.6%, center portion matrix is thinner lath martensite, and residual austenite content is 8~12%.
5. a kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear according to claim 1, it is characterised in that：
The grain size number of the retained austenite recrystallization of the passive inclined screw bevel gear of 30CrMnTi steel is 13-15 grades.
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| CN201810891433.9A CN108823502A (en) | 2018-08-07 | 2018-08-07 | A kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear |
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| CN201810891433.9A CN108823502A (en) | 2018-08-07 | 2018-08-07 | A kind of heat treatment process of 30CrMnTi steel large-scale spiral bevel gear |
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|---|---|---|---|---|
| CN110195147A (en) * | 2019-06-02 | 2019-09-03 | 潘立英 | The preparation method of large medical equipment pin shaft |
| CN110205463A (en) * | 2019-06-02 | 2019-09-06 | 潘立英 | A kind for the treatment of process of pin shaft |
| CN110195147B (en) * | 2019-06-02 | 2021-07-09 | 丁亮 | Preparation method of pin shaft for large medical equipment |
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