CN1265427A - Spheroidizing Annealing Method of Hypoeutectoid Low Alloy Steel - Google Patents
Spheroidizing Annealing Method of Hypoeutectoid Low Alloy Steel Download PDFInfo
- Publication number
- CN1265427A CN1265427A CN 00102387 CN00102387A CN1265427A CN 1265427 A CN1265427 A CN 1265427A CN 00102387 CN00102387 CN 00102387 CN 00102387 A CN00102387 A CN 00102387A CN 1265427 A CN1265427 A CN 1265427A
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- CN
- China
- Prior art keywords
- temperature
- hypoeutectoid
- low alloy
- steel
- ferrite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000000137 annealing Methods 0.000 title claims description 8
- 229910000851 Alloy steel Inorganic materials 0.000 title claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 6
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 4
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 4
- 239000000470 constituent Substances 0.000 claims abstract description 3
- 235000019362 perlite Nutrition 0.000 claims description 4
- 239000010451 perlite Substances 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 3
- 150000001247 metal acetylides Chemical class 0.000 abstract 2
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 229910001562 pearlite Inorganic materials 0.000 abstract 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 6
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 6
- 238000009413 insulation Methods 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- C21D1/78—Combined heat-treatments not provided for above
- C21D1/785—Thermocycling
-
- 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
- C21D1/28—Normalising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Method for spheroidizing annealed hypoeutectoid low alloy steels, in which a hot-rolled steel, which normally comprises ferrite and a higher carbon phase, such as pearlite or martensite/bainite microstructure constituents, is a) heated to a temperature between a1 and A3 until an austenite region is formed whose carbon content is higher than the basic composition, b) the temperature is lowered and kept below a1 to transform the austenite into ferrite and carbides, c) the temperature is kept below a1 until the carbides reach the desired degree of spheroidization.
Description
The present invention relates to a kind of method of Spheroidizing Annealing hypoeutectoid low alloy steel, be specifically related to a kind of heat treating method of hypoeutectoid low alloy steel, be distributed in the globular carbide of the aequum on the ferrite matrix, thereby strengthen the cold shaping performance of steel with acquisition.
When delivery, low and medium carbon steel has the perlite of comprising and ferrite usually, and the mixed structure of bainite and/or martensite (tempered or untempered) is arranged sometimes at present.This can machining and/throw into question in the cold shaping process.On the other hand, this again can the heavy wear cutter and form undesirable crackle in the cold shaping process on the object of handling.Two kinds of conventional heat treating methods of the softening steel that uses can not make low and medium carbon steel generation nodularization at present.
Spheroidizing Annealing is a kind of conventional heat treating method that high carbon steel forms pearlitic structure, and another kind of method is to form the soft steel of perlite and non-globular carbide in about 700 ℃ annealing.
In addition, the interpolation sulphur that uses can form manganese sulfide with the method that strengthens processing characteristics at present, has increased the danger that fatigue failure takes place under high-load.In casting process, this problem is even more serious, can form sulphur segregation and sulfide hairline.
Therefore, hope be not add sulphur and obtain good processing properties because, at present the load of being born on many parts of making be increase gradually rather than reduce.
The invention provides a kind of method of Spheroidizing Annealing hypoeutectoid low alloy steel, thereby improve cold shaping performance and machinability.
This can be achieved by adopting method of the present invention, in the method for the invention, and a kind of ferrite and a kind of high-carbon hot-rolled steel of perlite or martensite/bainite microstructure constituent element for example mutually that generally includes,
-the temperature that a) is heated between A1 and the A3 is higher than the austenite region that the basis is formed up to having formed its carbon content,
-b) reduce temperature and keep below A1 so that austenitic transformation is ferrite and carbide,
-c) keep temperature to be lower than A1, reach the nodularization of required degree up to carbide.
According to one embodiment of the invention, repeat a) at least and b) twice.Thereby this can reduce grain-size and increase the rate of diffusion of alloying element and reduce diffusion length.Contain the hypoeutectoid steel of minor amount of carbide forming element in order successfully to anneal, this is necessary.
(Ovako 234,0.2wt%C) adopt an embodiment of Spheroidizing Annealing method of the present invention to low and medium carbon steel in Fig. 1 description.
Fig. 2 describe be used for low and medium carbon steel (Ovako 593,0.5wt%C, 157,245, och255, second embodiment of the inventive method 0.2wt%C).
Fig. 3 describe be used for low and medium carbon steel (Ovako 593,0.5wt%C, 157,245 and 255, the 3rd embodiment of the inventive method 0.2wt%C).
Generally product is carried out hot rolling at present.Then these products be untreated, tempering, malleableize or the mode handled in the isothermal heat treatment furnace deliver goods.
The product of making and be delivered to the human consumer can be divided three classes according to the final processing before paying:
1. untreated:
-20 ℃-human consumer of about 1150 ℃ of hot rollings-be cooled to.
2. tempering and hardened:
-in 20 ℃ of about 1150 ℃ of hot rollings-be cooled to-about 650 ℃ of tempering-human consumers (tempered).
-in 20 ℃ of about 1150 ℃ of hot rollings-be cooled to-in about 900 ℃ of austenitizing-quenchings (water/oil)+about 650 ℃ of tempering-human consumers (malleableize).
3. in the isothermal heat treatment furnace, carried out processing:
-in about 650 ℃ of about 1150 ℃ of hot rollings-be cooled to-1 hour-human consumer of about 650 ℃ of insulations.
As far as our knowledge goes, the low and/or medium carbon steel that does not have provider to provide to have spherodized structure.Steel for these types, three embodiments of the inventive method have been provided, promptly be heated to or temperature that isothermal remains between A1 and the A3 is higher than the austenite region that the basis is formed up to having formed its carbon content, reduce temperature then and keep below A1 so that austenitic transformation is ferrite and carbide, and keep temperature to be lower than A1, reach the nodularization of required degree up to carbide.
Embodiment
Handle the steel of two kinds of different trades mark, contained the Ovako 157 and the Ovako 057 that contains about 0.5wt%C of about 0.2wt%C.
To every kind of steel normalizing four times, its method is that temperature is brought up to temperature between A1 and the A3, is 790 ℃ to these steel, then temperature is reduced to and is lower than A1, be about 600 ℃ in this example, afterwards in about 690 ℃ of insulations up to the nodularization that reaches required degree, form and not contain any pearlitic tissue.Four times or more normalizing crystal grain thinning have formed a large amount of crystal boundaries, have increased the amount of austenitic high energy nucleation site.Austenite region increase the diffusion length that reduces to reduce alloying element with its size, make required nodularization become possibility.
The grain formation position of high energy makes only need spread a spot of carbon because of undue grain refining at every turn and reach 100% nodularization with minimum nodularization crystal grain and become possibility.
Fig. 1 illustrates described method.
Ovako 234 steel that adopt method of the present invention to handle to contain about 0.2wt%C, its method is that temperature is brought up to temperature between A1 and the A3, is about 740 ℃ in this example, then insulation for a long time, temperature is reduced to is lower than A1, and be incubated then up to the nodularization that reaches required degree.
Fig. 2 has described this embodiment of method of the present invention.
Tested the following steel trade mark: contain the Ovako 593 of about 0.5wt%C, contain the Ovako 157,245 and 255 of 0.2wt%C.Its method is that temperature is brought up to temperature between A1 and the A3, is about 740 ℃ in this example, is incubated about 1 hour then, temperature is reduced to significantly be lower than A1, and promptly about 600 ℃, and then be warmed up to about 670 ℃ and insulation up to the nodularization that reaches required degree.
In three embodiments of all methods of the present invention, all reached 100% nodularization.The effect that temperature is reduced to a minimum value as embodiment 3 significantly improves the performance of the material of waiting to be delivered to the human consumer.
Claims (2)
1. the method for Spheroidizing Annealing hypoeutectoid low alloy steel, wherein a kind of ferrite and high-carbon hot-rolled steel of perlite or martensite/bainite microstructure constituent element for example mutually that generally includes,
-the temperature that a) is heated between A1 and the A3 is higher than the austenite region that the basis is formed up to having formed its carbon content,
-b) reduce temperature and keep below A1 so that austenitic transformation is ferrite and carbide,
-c) keep temperature to be lower than A1, reach the nodularization of required degree up to carbide.
2. according to the process of claim 1 wherein step a) and b) repeat at least twice.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9900598A SE521770C2 (en) | 1999-02-22 | 1999-02-22 | Spheroidal annealing of undereutectic low alloy steel |
| SE99005985 | 1999-02-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1265427A true CN1265427A (en) | 2000-09-06 |
Family
ID=20414556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00102387 Pending CN1265427A (en) | 1999-02-22 | 2000-02-22 | Spheroidizing Annealing Method of Hypoeutectoid Low Alloy Steel |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1031631A3 (en) |
| JP (1) | JP2000239737A (en) |
| CN (1) | CN1265427A (en) |
| SE (1) | SE521770C2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348742C (en) * | 2006-03-14 | 2007-11-14 | 钢铁研究总院 | Spheroidal annealing process of deep-punched steel plate for preventing bullet |
| CN102226228A (en) * | 2011-06-08 | 2011-10-26 | 马鞍山钢铁股份有限公司 | Technology for testing pearlite in low carbon steel structure in mesophase spheroidizing annealing |
| CN106755852A (en) * | 2016-11-30 | 2017-05-31 | 中国船舶重工集团公司第十二研究所 | A kind of steel alloy soft softening method |
| CN107723435A (en) * | 2017-11-30 | 2018-02-23 | 贵州大学 | The method and device of the full pearlitic structrure of refinement is obtained in sub-eutectoid steel wire rod |
| CN115013601A (en) * | 2022-07-01 | 2022-09-06 | 江苏徐工工程机械研究院有限公司 | Concrete conveying pipe, manufacturing method thereof and concrete pump truck |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100653134B1 (en) * | 2006-04-25 | 2006-12-04 | 광진실업 주식회사 | A machine for spheroidization |
| DE102011051682B4 (en) * | 2011-07-08 | 2013-02-21 | Max Aicher | Method and apparatus for treating a steel product and steel product |
| CZ305540B6 (en) * | 2014-05-21 | 2015-11-25 | Západočeská Univerzita V Plzni | Heat treatment process of high-alloy steel |
| CN109593929B (en) * | 2018-12-12 | 2020-10-30 | 河钢股份有限公司承德分公司 | Spheroidizing annealing method of cold forging steel |
| CN109628713B (en) * | 2018-12-12 | 2020-11-06 | 河钢股份有限公司承德分公司 | Spheroidizing annealing method of low-carbon steel |
| CN109517949B (en) * | 2018-12-12 | 2020-10-30 | 河钢股份有限公司承德分公司 | Spheroidizing annealing method of steel for shafts |
| CN109487052B (en) * | 2018-12-12 | 2020-10-30 | 河钢股份有限公司承德分公司 | Spheroidizing annealing method of B-containing cold forging steel |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4322256A (en) * | 1979-01-31 | 1982-03-30 | Snap-On Tools Corporation | Tool made from alloy steel for severe cold forming |
| RU2023026C1 (en) * | 1991-07-02 | 1994-11-15 | Украинский государственный научно-исследовательский институт металлов | Method for heat treatment of rails |
-
1999
- 1999-02-22 SE SE9900598A patent/SE521770C2/en not_active IP Right Cessation
-
2000
- 2000-02-14 EP EP00850027A patent/EP1031631A3/en not_active Withdrawn
- 2000-02-17 JP JP2000039585A patent/JP2000239737A/en active Pending
- 2000-02-22 CN CN 00102387 patent/CN1265427A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348742C (en) * | 2006-03-14 | 2007-11-14 | 钢铁研究总院 | Spheroidal annealing process of deep-punched steel plate for preventing bullet |
| CN102226228A (en) * | 2011-06-08 | 2011-10-26 | 马鞍山钢铁股份有限公司 | Technology for testing pearlite in low carbon steel structure in mesophase spheroidizing annealing |
| CN106755852A (en) * | 2016-11-30 | 2017-05-31 | 中国船舶重工集团公司第十二研究所 | A kind of steel alloy soft softening method |
| CN107723435A (en) * | 2017-11-30 | 2018-02-23 | 贵州大学 | The method and device of the full pearlitic structrure of refinement is obtained in sub-eutectoid steel wire rod |
| CN107723435B (en) * | 2017-11-30 | 2023-06-06 | 贵州大学 | Method and device for obtaining refined full pearlite structure in hypoeutectoid steel wire rod |
| CN115013601A (en) * | 2022-07-01 | 2022-09-06 | 江苏徐工工程机械研究院有限公司 | Concrete conveying pipe, manufacturing method thereof and concrete pump truck |
| CN115013601B (en) * | 2022-07-01 | 2023-11-07 | 江苏徐工工程机械研究院有限公司 | Concrete conveying pipe, manufacturing method thereof and concrete pump truck |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1031631A2 (en) | 2000-08-30 |
| JP2000239737A (en) | 2000-09-05 |
| EP1031631A3 (en) | 2003-10-08 |
| SE9900598L (en) | 2000-08-23 |
| SE9900598D0 (en) | 1999-02-22 |
| SE521770C2 (en) | 2003-12-02 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |