CN104789748A - Bearing steel tube spheroidizing annealing method - Google Patents
Bearing steel tube spheroidizing annealing method Download PDFInfo
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- CN104789748A CN104789748A CN201510186804.XA CN201510186804A CN104789748A CN 104789748 A CN104789748 A CN 104789748A CN 201510186804 A CN201510186804 A CN 201510186804A CN 104789748 A CN104789748 A CN 104789748A
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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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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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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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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Abstract
The invention belongs to the technical field of bearing steel tube manufacturing, and particularly relates to a bearing steel tube spheroidizing annealing method which comprises the following steps: introducing a pierced billet into an annealing furnace; controlling the annealing temperature and the annealing time, namely, heating the pierced billet to be straightly heated to be 90-95% of the peak temperature, carrying out intermittent heating to ensure the peak temperature is achieved, and keeping the temperature while each temperature gradient is achieved in the intermittent heating period; keeping the peak temperature after the peak temperature is achieved; carrying out intermittent cooling, and keeping the temperature while each temperature gradient is reduced in the intermittent cooling period until the temperature is reduced to be 82% or lower of the peak temperature; continuing cooling till the room temperature is achieved, wherein the peak temperature is 60 DEG C or higher than phase inversion temperature. After treatment according to the bearing steel tube spheroidizing annealing method, the hardness of the bearing steel tube made of GCr15 steel can be reduced to be 190 HBW or lower.
Description
Technical field
The invention belongs to Steel Pipe For Bearing manufacturing technology field, be specifically related to a kind of Steel Pipe For Bearing Spheroidizing Annealing method.
Background technology
Spheroidizing Annealing is called again Spheroidizing annealing in the world, and general idea is the annealing making carbide spheroidization in steel and carry out, and obtains the tissue of equally distributed spherical or granular carbide on ferrite matrix.
In prior art, carbide annealing process is generally following to carry out: steel is heated to more than Ac1 20 ~ 30 DEG C, insulation for some time, be then slowly cooled to the temperature a little less than Ar1, and stay for some time, structural transformation is completed, obtains the tissue of equally distributed spherical or granular carbide on ferrite matrix.When Ac1 refers to that steel heats, start to form austenitic temperature; When Ar1 cools after referring to steel influence of high austenizing temp, austenite starts the temperature being decomposed into ferrite and pearlite.
Carbide annealing process method is a lot, and two kinds of the most frequently used techniques are common Spheroidizing Annealing and isothermal spheroidizing.Common Spheroidizing Annealing steel is heated to more than Ac1 20 ~ 30 DEG C, and insulation appropriate time, then with stove Slow cooling, is as cold as about 500 DEG C air coolings of coming out of the stove.Isothermal spheroidizing is after the heating and thermal insulation same with common carbide annealing process, and furnace cooling carries out isothermal to the temperature a little less than Ar1, and isothermal time is 1.5 times of its heating and thermal insulation time.About 500 DEG C air coolings of coming out of the stove are chilled to stove after isothermal.Compare with common Spheroidizing Annealing, isothermal spheroidizing not only can shorten the cycle, and spherodized structure can be made even, and strictly can control the hardness after annealing.
Spheroidizing Annealing is mainly used in hypereutectoid carbon steel and alloy tool steel (as manufactured cutlery, measurer, mould steel grade used).Its main purpose is to reduce hardness, improves machinability, and gets ready for quenching later.This process advan, in plastic working and machining, can also improve mechanical tenacity.
But in Steel Pipe For Bearing production field, GCr15 Spheroidizing Annealing hardness is generally at about 200HBW, and bearing steel carbon content and chrome content all very high rigidity, is difficult to reduce further.Hardness is lower more easily carries out in follow-up cold working process, can also extend the cold working process mold use life-span simultaneously.Therefore the hardness of hope GCr15 after Spheroidizing Annealing that this area is urgent is suitably reduced.
Summary of the invention
The present invention will solve the problems of the technologies described above, thus provides a kind of Steel Pipe For Bearing Spheroidizing Annealing method.The method can make GCr15 hardness after Spheroidizing Annealing approximately drop to 190HBW.
The technical scheme that the present invention solves the problem is as follows:
The Spheroidizing Annealing method of Steel Pipe For Bearing, comprise the following steps: hollow forging is introduced annealing furnace, control annealing temperature and annealing time, control as follows: heating hollow forging makes it ramped thermal to 90% ~ 95% of peak temperature, then broken line is warming up to peak temperature, and the temperature step that often rises between broken line temperature raising period is all incubated; Be incubated after rising to peak temperature; Then broken line cooling, the temperature step that often declines between broken line cooldown period is all incubated, until temperature is down to 82% or following of peak temperature; Continue cooling until room temperature; Described peak temperature is greater than phase transition temperature more than 60 DEG C.
Preferred as technique scheme, the steel grade of described hollow forging is GCr15, and described peak temperature is 810 ~ 820 DEG C.
Preferred as technique scheme, the time of described insulation is 0.5 ~ 1h.
Preferred as technique scheme, annealing temperature and annealing time, concrete control as follows: heat hollow forging and make it ramped thermal to 750 DEG C, insulation, continues to be heated to 790 DEG C, insulation, continue heating until peak temperature, insulation, is then cooled to 760 DEG C, insulation, continues to be cooled to 755 DEG C, insulation, continue to be cooled to 750 DEG C, insulation, continues to be cooled to 745 DEG C, insulation, continue to be cooled to 740 DEG C, insulation, continues to be cooled to 720 DEG C, insulation, continue to be cooled to 690 DEG C, insulation, continues to be cooled to 650 DEG C, insulation, continues cooling until room temperature.
Preferred as technique scheme, and then the soaking time of peak temperature is 1h, and times of other insulations are 0.5h.
The present invention has following beneficial effect:
Through process of the present invention, the hardness of the bearing hollow forging of GCr15 steel grade can be down to below 190HBW.
Accompanying drawing explanation
Fig. 1 is the artwork of prior art;
Fig. 2 is artwork of the present invention;
Abscissa representing time in figure, ordinate zou represents temperature.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed.
This embodiment is only explanation of the invention, is not limitation of the present invention, any change that those skilled in the art have made after having read specification sheets of the present invention, as long as all will be subject to the protection of patent law in the scope of claims.
Comparative example
The method for annealing of GCr15 Steel Pipe For Bearing, as shown in Figure 1,
GCr15 Steel Pipe For Bearing is heated to 800 DEG C, and insulation 1h, then with stove Slow cooling, is as cold as 780 DEG C, insulation 1h, then furnace cooling.The product obtained adopts Brinell tester to detect, and hardness value is at 98 ~ 202HBW.
Embodiment
The Spheroidizing Annealing method of GCr15 Steel Pipe For Bearing, hollow forging is introduced annealing furnace, control annealing temperature and annealing time, control as follows: heating hollow forging makes it ramped thermal to 750 DEG C, insulation 0.5h, continue to be heated to 790 DEG C, insulation 0.5h, continue heating until peak temperature, insulation 1h, then 760 DEG C are cooled to, insulation 0.5h, continue to be cooled to 755 DEG C, insulation 0.5h, continue to be cooled to 750 DEG C, insulation 0.5h, continue to be cooled to 745 DEG C, insulation 0.5h, continue to be cooled to 740 DEG C, insulation 0.5h, continue to be cooled to 720 DEG C, insulation 0.5h, continue to be cooled to 690 DEG C, insulation 0.5h, continue to be cooled to 650 DEG C, insulation 0.5h, continue cooling until room temperature.The product obtained adopts Brinell tester to detect, and hardness value is at 180 ~ 184HBW.
Claims (5)
1. the Spheroidizing Annealing method of Steel Pipe For Bearing, comprise the following steps: hollow forging is introduced annealing furnace, control annealing temperature and annealing time, control as follows: heating hollow forging makes it ramped thermal to 90% ~ 95% of peak temperature, then broken line is warming up to peak temperature, and the temperature step that often rises between broken line temperature raising period is all incubated; Be incubated after rising to peak temperature; Then broken line cooling, the temperature step that often declines between broken line cooldown period is all incubated, until temperature is down to 82% or following of peak temperature; Continue cooling until room temperature; Described peak temperature is greater than phase transition temperature more than 60 DEG C.
2. Steel Pipe For Bearing Spheroidizing Annealing method according to claim 1, is characterized in that: the steel grade of described hollow forging is GCr15, and described peak temperature is 810 ~ 820 DEG C.
3. Steel Pipe For Bearing Spheroidizing Annealing method according to claim 1, is characterized in that: the time of described insulation is 0.5 ~ 1h.
4. Steel Pipe For Bearing Spheroidizing Annealing method according to claim 2, it is characterized in that: annealing temperature and annealing time, concrete control is as follows: heating hollow forging makes it ramped thermal to 750 DEG C, insulation, continue to be heated to 790 DEG C, insulation, continue heating until peak temperature, insulation, then 760 DEG C are cooled to, insulation, continue to be cooled to 755 DEG C, insulation, continue to be cooled to 750 DEG C, insulation, continue to be cooled to 745 DEG C, insulation, continue to be cooled to 740 DEG C, insulation, continue to be cooled to 720 DEG C, insulation, continue to be cooled to 690 DEG C, insulation, continue to be cooled to 650 DEG C, insulation, continue cooling until room temperature.
5. Steel Pipe For Bearing Spheroidizing Annealing method according to claim 2, is characterized in that: and then the soaking time of peak temperature is 1h, and the time of other insulations is 0.5h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510186804.XA CN104789748A (en) | 2015-04-20 | 2015-04-20 | Bearing steel tube spheroidizing annealing method |
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| CN201510186804.XA CN104789748A (en) | 2015-04-20 | 2015-04-20 | Bearing steel tube spheroidizing annealing method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521107A (en) * | 2016-10-17 | 2017-03-22 | 江阴兴澄特种钢铁有限公司 | Novel spheroidizing annealing method for low-carbon bainite steel |
| CN107263036A (en) * | 2017-07-19 | 2017-10-20 | 吴江市双精轴承有限公司 | A kind of processing method of locating snap ring |
| CN113481354A (en) * | 2021-07-05 | 2021-10-08 | 大连环新精密特钢股份有限公司 | Ultrahigh-speed continuous isothermal spheroidizing annealing method and device for carbon steel |
| CN114438298A (en) * | 2022-02-21 | 2022-05-06 | 中国科学院金属研究所 | High-temperature diffusion method and alloy steel |
| CN115323128A (en) * | 2022-07-01 | 2022-11-11 | 江阴兴澄合金材料有限公司 | Spheroidizing annealing process based on bell-type furnace GCr15 wire rod |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102382962A (en) * | 2011-11-10 | 2012-03-21 | 浙江健力股份有限公司 | Quick spheroidizing annealing technology for GCr15 bearing steel pipe |
| CN102433502A (en) * | 2011-12-23 | 2012-05-02 | 中冶南方(武汉)威仕工业炉有限公司 | Spheroidized annealing technology for GCr15 bearing steel |
| CN104328259A (en) * | 2014-10-13 | 2015-02-04 | 北京科技大学 | GCr15 high carbon chromium bearing steel on-line rapid spheroidizing annealing technology |
-
2015
- 2015-04-20 CN CN201510186804.XA patent/CN104789748A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102382962A (en) * | 2011-11-10 | 2012-03-21 | 浙江健力股份有限公司 | Quick spheroidizing annealing technology for GCr15 bearing steel pipe |
| CN102433502A (en) * | 2011-12-23 | 2012-05-02 | 中冶南方(武汉)威仕工业炉有限公司 | Spheroidized annealing technology for GCr15 bearing steel |
| CN104328259A (en) * | 2014-10-13 | 2015-02-04 | 北京科技大学 | GCr15 high carbon chromium bearing steel on-line rapid spheroidizing annealing technology |
Non-Patent Citations (2)
| Title |
|---|
| 郭秀文: "《热处理工技术问答》", 30 June 1982 * |
| 韩斌等: "GCr15轴承钢大圆材的球化退火工艺", 《金属热处理》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521107A (en) * | 2016-10-17 | 2017-03-22 | 江阴兴澄特种钢铁有限公司 | Novel spheroidizing annealing method for low-carbon bainite steel |
| CN107263036A (en) * | 2017-07-19 | 2017-10-20 | 吴江市双精轴承有限公司 | A kind of processing method of locating snap ring |
| CN107263036B (en) * | 2017-07-19 | 2019-07-19 | 吴江市双精轴承有限公司 | A kind of processing method of locating snap ring |
| CN113481354A (en) * | 2021-07-05 | 2021-10-08 | 大连环新精密特钢股份有限公司 | Ultrahigh-speed continuous isothermal spheroidizing annealing method and device for carbon steel |
| CN114438298A (en) * | 2022-02-21 | 2022-05-06 | 中国科学院金属研究所 | High-temperature diffusion method and alloy steel |
| CN114438298B (en) * | 2022-02-21 | 2022-11-15 | 中国科学院金属研究所 | High-temperature diffusion method and alloy steel |
| CN115323128A (en) * | 2022-07-01 | 2022-11-11 | 江阴兴澄合金材料有限公司 | Spheroidizing annealing process based on bell-type furnace GCr15 wire rod |
| CN115323128B (en) * | 2022-07-01 | 2023-10-20 | 江阴兴澄合金材料有限公司 | Spheroidizing annealing process based on bell-type furnace GCr15 wire rod |
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