CN105369260A - Carburizing heat treatment technique for 8620H gear steel - Google Patents
Carburizing heat treatment technique for 8620H gear steel Download PDFInfo
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- CN105369260A CN105369260A CN201510799731.1A CN201510799731A CN105369260A CN 105369260 A CN105369260 A CN 105369260A CN 201510799731 A CN201510799731 A CN 201510799731A CN 105369260 A CN105369260 A CN 105369260A
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- carburizing
- temperature
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- heat treatment
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- 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
- 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
- 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
Abstract
The invention discloses a carburizing heat treatment technique for 8620H gear steel. The carburizing heat treatment technique for the 8620H gear steel comprises the steps that (1) pretreatment is conducted, the 8620H gear steel is placed in a continuous automatic carburizing and quenching line furnace, and the 8620H gear steel is preheated for 68 minutes at the temperature of 400+/-5 DEG C after being cleaned; (2) pre-carburizing is conducted, the temperature is increased to 880+/-5 DEG C and then maintained for 35 minutes; (3) carburizing is conducted for 70 minutes at the temperature of 920+/-5 DEG C, the carbon potential in the first 35 minutes is 1%, and the carbon potential in the later 35 minutes is 0.9%; (4) diffusion is conducted, the temperature is decreased to 880+/-5 DEG C and then maintained for 35 minutes under the condition that the carbon potential is 0.85%; (5) heat preservation before quenching is conducted for 35 minutes when the temperature is decreased to 860+/-5 DEG C; (6) oil quenching is conducted at the temperature of 110+/-5 DEG C; and (7) tempering is conducted, and low-temperature tempering is conducted for three hours at the temperature of 170 DEG C. According to the carburizing heat treatment technique, the carburizing effect of the surface of the gear steel can be effectively improved, the hardness and abrasion resistance of the gear steel are improved, and the economical efficiency is considered.
Description
Technical field
The present invention relates to metallic substance thermal treatment process, specifically the carburizing heat treatment process of 8620H Pinion Steel.
Background technology
The grade of steel that 8620H steel is corresponding is at home 20CrNiMoH steel, is conventional Pinion Steel.The main alloy element comprised is Cr, Ni, Mo, and wherein Cr and Mo is carbide forming element, and Ni is non-carbide forming element.Cr and Mo carbide forming element can increase surface carbon concentration when carburizing, increase carbon profile, Ni then can reduce surface carbon concentration as non-carbide forming element, carbon concentration is flattened slow, in 8620H steel, carbide forming element and cooperatively interacting of non-carbide forming element can make converted steel have good carbon potential.
Gear is as main important driving parts, and it proposes high requirement to wear resistance, therefore, needs to carry out carburizing thermal treatment to realize to Pinion Steel; Carburizing is the one to metal finishing, and make the active atoms of carbon decomposited in carburizing medium infiltrate steel part top layer, thus obtain top layer high-carbon, heart portion still keeps original composition.This is the common a kind of thermal treatment process of metallic substance, and it can make the workpiece surface of infiltrate carbon obtain very high hardness, improves its rub proofness.
Summary of the invention
Problem to be solved by this invention is, provides one effectively can improve Pinion Steel surface cementation effect, improves its hardness and wear resistance, and take into account the carburizing heat treatment process of economy.
For reaching above-mentioned technique effect, the invention provides following technical scheme: the carburizing heat treatment process of 8620H Pinion Steel, the technical scheme adopted comprises the following steps:
(1) pre-treatment: put into the automatic carburizing and quenching line oven of continous way, preheating 68 minutes at 400 ± 5 DEG C of temperature after cleaning;
(2) pre-carburizing: temperature is increased to 880 ± 5 DEG C of insulations 35 minutes;
(3) carburizing: carburizing 70 minutes at the temperature of 920 ± 5 DEG C, its first 35 minutes carbon potentials are 1%, and within latter 35 minutes, carbon potential is 0.9%;
(4) spread: be cooled to 880 ± 5 DEG C, under 0.85% carbon potential, be incubated 35 minutes;
(5) be incubated: the insulation before quenching, at being down to 860 ± 5 DEG C, be incubated 35 minutes;
(6) quench: with 110 ± 5 DEG C of oil quenchings;
(7) tempering: carry out low-temperaturetempering 3h at 170 DEG C of temperature.
This carburizing Heat Treatment Of Steel carburization process inventive principle is:
First carry out pre-treatment, the impurity, oil stain etc. of clean surface attachment, the object of preheating makes gear part internal and external temperature consistent, do not destroy again crystal inside mechanism, and then lay the foundation for next step intensification.
Carry out pre-carburizing afterwards, in the carburizing environment of high carbon potential, low temperature, the activity of carbon is higher, easier forming core, be conducive to improving nucleation rate, thus (carbide first formed by pre-carburizing, when the carbide particle that prestores is as later stage carburizing to obtain the numerous carbide particle that prestores, core as new carbide is formed), for Cycle carburizing is ready.
Then carry out carburizing, in cementation process, material structure is austenite+carbide, and along with the carrying out of carburizing in cementation process, the carbon content in austenite raises gradually, until carbon content levels off to saturated in austenite; Simultaneously in material, carbide and carbon react and form new carbide.
Carry out after Cycle carburizing spreading, be incubated and quench, its objective is to obtain mild carbon content distribution (Hardness Distribution after quenching), reducing the stress because carburizing thermal treatment causes.
Finally carry out tempering, for reducing the internal stress in steel part.
The invention has the beneficial effects as follows: carburizing Heat Treatment Of Steel carburization process of the present invention, add special pre-carburization process, in the carburizing environment of high carbon potential, low temperature, nucleation rate is high, obtain the numerous carbide particle that prestores, increase the carbon content of infiltration layer, increase the nucleation rate of carbide, but significantly do not increase carbide size again, avoid Carbide Coarsening; And coordinate Cycle carburizing afterwards, carbon in austenite in high temperature is approached to saturation, thus after the tiny carbide portion on surface is melted, become new forming core point, the tiny carbide of surperficial infiltration layer is finally made to increase gradually, obtain a large amount of tiny carbide particles, effectively grain fineness number has been refine to 8 grades from 7 grades, then through suitable diffusion, Quench and temper process.On the basis meeting heart portion performance, improve the wear resistance on surface greatly.
Embodiment
Below by embodiment, the present invention is specifically described; only be used to further illustrate the present invention; can not be interpreted as limiting the scope of the present invention, the technician in this field can make some nonessential improvement and adjustment according to the content of foregoing invention to the present invention.
Embodiment 1
The carburizing heat treatment process of 8620H Pinion Steel, comprises the following steps:
(1) pre-treatment: put into the automatic carburizing and quenching line oven of continous way, through cleaning after at 395 DEG C of temperature preheating 60min;
(2) pre-carburizing: temperature is increased to 875 DEG C of insulation 35min;
(3) carburizing: carburizing 70min at the temperature of 915 DEG C, its first 35 minutes carbon potentials are 1%, and within latter 35 minutes, carbon potential is 0.9%;
(4) spread: be cooled to 875 DEG C, under 0.85% carbon potential, be incubated 35min;
(5) be incubated: the insulation before quenching, is incubated 35min at being down to 855 DEG C;
(6) quench: with 105 DEG C of oil quenchings;
(7) tempering: carry out low-temperaturetempering 180min at 170 DEG C of temperature.
Carburizing efficacy parameter
The paralympic rank of martensite and tissue characteristic 3 grades
Non-horse tissue 0.024
Grain fineness number 8 grades
Tooth root bending fatigue limit 690.4MPa
Embodiment 2
The carburizing heat treatment process of 8620H Pinion Steel, comprises the following steps:
(1) pre-treatment: put into the automatic carburizing and quenching line oven of continous way, through cleaning after at 400 DEG C of temperature preheating 60min;
(2) pre-carburizing: temperature is increased to 880 DEG C of insulation 35min;
(3) carburizing: carburizing 70min at the temperature of 920 DEG C, its first 35 minutes carbon potentials are 1%, and within latter 35 minutes, carbon potential is 0.9%;
(4) spread: be cooled to 880 DEG C, under 0.85% carbon potential, be incubated 35min;
(5) be incubated: the insulation before quenching, is incubated 35min at being down to 860 DEG C;
(6) quench: with 110 DEG C of oil quenchings;
(7) tempering: carry out low-temperaturetempering 180min at 170 DEG C of temperature.
Carburizing efficacy parameter
The paralympic rank of martensite and tissue characteristic 3 grades
Non-horse tissue 0.022
Grain fineness number 8 grades
Tooth root bending fatigue limit 685.4MPa
Embodiment 3
The carburizing heat treatment process of 8620H Pinion Steel, comprises the following steps:
(1) pre-treatment: put into the automatic carburizing and quenching line oven of continous way, through cleaning after at 405 DEG C of temperature preheating 60min;
(2) pre-carburizing: temperature is increased to 885 DEG C of insulation 35min;
(3) carburizing: carburizing 70min at the temperature of 925 DEG C, its first 35 minutes carbon potentials are 1%, and within latter 35 minutes, carbon potential is 0.9%;
(4) spread: be cooled to 885 DEG C, under 0.85% carbon potential, be incubated 35min;
(5) be incubated: the insulation before quenching, is incubated 35min at being down to 865 DEG C;
(6) quench: with 115 DEG C of oil quenchings;
(7) tempering: carry out low-temperaturetempering 180min at 170 DEG C of temperature.
Carburizing efficacy parameter
The paralympic rank of martensite and tissue characteristic 3 grades
Non-horse tissue 0.025
Grain fineness number 8 grades
Tooth root bending fatigue limit 684.8MPa
Can be found out by above concrete case study on implementation, after tested, the Key Quality Indicator such as its carburized depth, surface hardness and abrasion resistance all meet relevant criterion to the product selecting present invention process to obtain, and the working reliability of gear is high, long service life.Meanwhile, its technical process is simplified, and the production cycle shortens, good economy performance.
Claims (2)
- The carburizing heat treatment process of 1.8620H Pinion Steel, is characterized in that, comprises the following steps:(1) pre-treatment: put into the automatic carburizing and quenching line oven of continous way, through cleaning after at 400 ± 5 DEG C of temperature preheating 60min;(2) pre-carburizing: temperature is increased to 880 ± 5 DEG C of insulation 35min;(3) carburizing: carburizing 70min at the temperature of 920 ± 5 DEG C;(4) spread: be cooled to 880 ± 5 DEG C, under 0.85% carbon potential, be incubated 35min;(5) be incubated: the insulation before quenching, is incubated 35min at being down to 860 ± 5 DEG C;(6) quench: with 110 ± 5 DEG C of oil quenchings;(7) tempering: carry out low-temperaturetempering 180min at 170 DEG C of temperature.
- 2. the carburizing heat treatment process of 8620H Pinion Steel according to claim 1, is characterized in that, in the (3) carburizing at the temperature of 920 ± 5 DEG C described in step 70 minutes, its first 35 minutes carbon potentials are 1%, and within latter 35 minutes, carbon potential is 0.9%.
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106835004A (en) * | 2017-01-14 | 2017-06-13 | 山东海利传动机械制造有限公司 | A kind of gear shaft composite step carburizing quenching process |
| CN108203802A (en) * | 2017-12-29 | 2018-06-26 | 魏龙飞 | A kind of metal heating processing technology |
| CN108468014A (en) * | 2018-04-16 | 2018-08-31 | 岭南师范学院 | A kind of heat treatment method that tool steel surface carburizing is modified |
| CN108504985A (en) * | 2018-04-21 | 2018-09-07 | 永康市求精热处理厂 | A kind of heat treatment method of automobile high-strength hot forming torsion beam |
| CN108588630A (en) * | 2018-07-19 | 2018-09-28 | 上海上大热处理有限公司 | A kind of carburizing heat treatment method of steering gear gear mechanism |
| CN108728787A (en) * | 2017-04-19 | 2018-11-02 | 武汉华工激光工程有限责任公司 | A kind of anti-corrosion stiffener surface treatment method of austenitic stainless steel |
| CN109082628A (en) * | 2018-08-17 | 2018-12-25 | 中车戚墅堰机车车辆工艺研究所有限公司 | A kind of Gear Carbonization Process and its application |
| CN109321867A (en) * | 2017-07-31 | 2019-02-12 | 东北大学 | A kind of 16Cr3NiWMoVNbE steel vacuum low-pressure carburization technique |
| CN109385596A (en) * | 2018-11-27 | 2019-02-26 | 中国航发贵州黎阳航空动力有限公司 | A kind of 12Cr2Ni4A material gas carburization quenching method |
| CN109504935A (en) * | 2018-12-18 | 2019-03-22 | 上海嘉恒热处理有限公司 | A kind of thin sheet of metal part heat treatment process |
| CN111364000A (en) * | 2020-04-30 | 2020-07-03 | 中国航发哈尔滨东安发动机有限公司 | Method for controlling carburization process of aviation carburized part |
| CN111500834A (en) * | 2020-05-27 | 2020-08-07 | 江苏联峰实业有限公司 | Heat treatment process of gear steel for automobile gearbox |
| CN111549314A (en) * | 2020-05-21 | 2020-08-18 | 湖南特科能热处理有限公司 | Carburizing process for low-carbon steel thin-wall part |
| CN111719110A (en) * | 2020-06-30 | 2020-09-29 | 江苏南方机电股份有限公司 | Heat treatment process for accurately controlling depth of carburized layer |
| CN113215519A (en) * | 2021-04-19 | 2021-08-06 | 常州天山重工机械有限公司 | Muffle-tank-free carbon saturation control process |
| CN113388783A (en) * | 2021-06-24 | 2021-09-14 | 马鞍山钢铁股份有限公司 | Nb, V and Ti microalloyed gear steel and preparation method, heat treatment method, carburization method and carburized gear steel thereof |
| CN113403568A (en) * | 2021-06-01 | 2021-09-17 | 温岭市云福热处理厂 | Low-carbon steel and heat treatment process thereof |
| CN113981363A (en) * | 2021-12-01 | 2022-01-28 | 浙江求精科技有限公司 | Intelligent environment-friendly metal material heat treatment device and production process thereof |
| CN114774837A (en) * | 2022-04-28 | 2022-07-22 | 南京高精齿轮集团有限公司 | Carburizing and quenching process |
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| CN103820750A (en) * | 2014-03-14 | 2014-05-28 | 重庆望江工业有限公司 | Vacuum carburizing heat treatment method |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106835004A (en) * | 2017-01-14 | 2017-06-13 | 山东海利传动机械制造有限公司 | A kind of gear shaft composite step carburizing quenching process |
| CN108728787A (en) * | 2017-04-19 | 2018-11-02 | 武汉华工激光工程有限责任公司 | A kind of anti-corrosion stiffener surface treatment method of austenitic stainless steel |
| CN109321867A (en) * | 2017-07-31 | 2019-02-12 | 东北大学 | A kind of 16Cr3NiWMoVNbE steel vacuum low-pressure carburization technique |
| CN108203802A (en) * | 2017-12-29 | 2018-06-26 | 魏龙飞 | A kind of metal heating processing technology |
| CN108468014A (en) * | 2018-04-16 | 2018-08-31 | 岭南师范学院 | A kind of heat treatment method that tool steel surface carburizing is modified |
| CN108504985A (en) * | 2018-04-21 | 2018-09-07 | 永康市求精热处理厂 | A kind of heat treatment method of automobile high-strength hot forming torsion beam |
| CN108588630A (en) * | 2018-07-19 | 2018-09-28 | 上海上大热处理有限公司 | A kind of carburizing heat treatment method of steering gear gear mechanism |
| CN109082628B (en) * | 2018-08-17 | 2021-02-05 | 中车戚墅堰机车车辆工艺研究所有限公司 | Gear carburizing process and application thereof |
| CN109082628A (en) * | 2018-08-17 | 2018-12-25 | 中车戚墅堰机车车辆工艺研究所有限公司 | A kind of Gear Carbonization Process and its application |
| CN109385596A (en) * | 2018-11-27 | 2019-02-26 | 中国航发贵州黎阳航空动力有限公司 | A kind of 12Cr2Ni4A material gas carburization quenching method |
| CN109504935A (en) * | 2018-12-18 | 2019-03-22 | 上海嘉恒热处理有限公司 | A kind of thin sheet of metal part heat treatment process |
| CN111364000A (en) * | 2020-04-30 | 2020-07-03 | 中国航发哈尔滨东安发动机有限公司 | Method for controlling carburization process of aviation carburized part |
| CN111549314A (en) * | 2020-05-21 | 2020-08-18 | 湖南特科能热处理有限公司 | Carburizing process for low-carbon steel thin-wall part |
| CN111500834A (en) * | 2020-05-27 | 2020-08-07 | 江苏联峰实业有限公司 | Heat treatment process of gear steel for automobile gearbox |
| CN111719110A (en) * | 2020-06-30 | 2020-09-29 | 江苏南方机电股份有限公司 | Heat treatment process for accurately controlling depth of carburized layer |
| CN113215519A (en) * | 2021-04-19 | 2021-08-06 | 常州天山重工机械有限公司 | Muffle-tank-free carbon saturation control process |
| CN113215519B (en) * | 2021-04-19 | 2023-08-15 | 常州天山重工机械有限公司 | Carbon saturation control process of muffle-free tank |
| CN113403568A (en) * | 2021-06-01 | 2021-09-17 | 温岭市云福热处理厂 | Low-carbon steel and heat treatment process thereof |
| CN113388783A (en) * | 2021-06-24 | 2021-09-14 | 马鞍山钢铁股份有限公司 | Nb, V and Ti microalloyed gear steel and preparation method, heat treatment method, carburization method and carburized gear steel thereof |
| CN113388783B (en) * | 2021-06-24 | 2022-04-29 | 马鞍山钢铁股份有限公司 | Nb, V and Ti microalloyed gear steel and preparation method, heat treatment method, carburization method and carburized gear steel thereof |
| CN113981363A (en) * | 2021-12-01 | 2022-01-28 | 浙江求精科技有限公司 | Intelligent environment-friendly metal material heat treatment device and production process thereof |
| CN114774837A (en) * | 2022-04-28 | 2022-07-22 | 南京高精齿轮集团有限公司 | Carburizing and quenching process |
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Application publication date: 20160302 |