CN100434543C - Homogenization treatment process of SAE8620 carburizing steel - Google Patents
Homogenization treatment process of SAE8620 carburizing steel Download PDFInfo
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- CN100434543C CN100434543C CNB2005100612672A CN200510061267A CN100434543C CN 100434543 C CN100434543 C CN 100434543C CN B2005100612672 A CNB2005100612672 A CN B2005100612672A CN 200510061267 A CN200510061267 A CN 200510061267A CN 100434543 C CN100434543 C CN 100434543C
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Abstract
This invention relates to a heat treatment technology of steel products, especially relating to a normalizing heat treatment technology of SAE8620 carburizing steel. It mainly solves the problems what exist in present technique such as: its hardness can achieve the requirement, microstructure can achieve state that ferrite adds perlite and no bainite carburizing steel utilizing normalizing many times, and technology is complicated, cost is high. Technology steps of this invention is: after steel products are putted in continuous push rod stove of which stove temperature is 890deg.C -950deg.C to heat to 850deg.C -930deg.C, keep temperature 0.5-4 hours; After reheat to 890DEG C-950deg.C, keep temperature 1-6 hours; Release and close whole basket and wind chill 2-8 minutes; Release and open wide whole basket and wind chill.
Description
Technical field
The present invention relates to a kind of thermal treatment process of steel, particularly relate to a kind of normalizing heat treatment technique of SAE8620 converted steel.
Background technology
Converted steel exists bainite and hardness too high (greater than 207HBS) or too low (less than 156HBS) generally can produce adverse influence to machining, and steel can not be shaped in machining.Chinese patent disclose a kind of anti-corrosion steel part heat treating method (publication number: CN 1026499C), the austenitic transformation of this steel part to the crossing temperature (A3) of ferrite and carbon body between 650 to 850 ℃; And the composition that is lower than gained steel under 10 ℃ of/minute conditions in rate of cooling does not exist micro-group of martensite strong in fact; This method is: (a) a kind of corrosion-resistant steel part is delivered mutually and carried out hot-work under the temperature condition being higher than above-mentioned A3.(b) steel part insulation that should heat is in case too much loses heat; (c) the hot worked steel part of process of insulation is cooled to and is lower than the described temperature of delivering mutually, the speed of cooling of its mensuration guaranteeing there is not martensitic microstructure in the whole steel part in fact, thereby obtains through heat treated steel part between 10 ℃ to 1 ℃ of per minute.But this thermal treatment process is applicable to the converted steel poor effect, and converted steel exists bainite or hardness less than 154HBS (as Fig. 1) after the normalizing of the former normalizing heat treatment technique of converted steel, all think at present: converted steel adopts repeatedly normalizing, its hardness just can reach 156HBS-207HBS, metallographic structure just can reach ferrite and add perlite, no bainite.
Summary of the invention
Main purpose of the present invention is to provide a kind of normalizing heat treatment technique of SAE8620 converted steel, it has mainly solved existing in prior technology converted steel and has adopted repeatedly normalizing, its hardness just can reach requirement, metallographic structure just can reach the state that ferrite adds perlite, no bainite, and technology is comparatively complicated, and cost is than problems such as height.
Above-mentioned technical purpose of the present invention solves by the following technical programs: processing step is as follows:
(a) steel were put into behind the continuous push rod furnace internal heating to 850 ℃-930 ℃ of 850 ℃-930 ℃ of furnace temperatures insulation 0.5-4 hour;
(b) insulation 1-6 hour behind the reheat to 890 ℃-950 ℃;
(c) come out of the stove and opened wide whole basket air-cooled 1-6 minute;
(d) come out of the stove open wide air-cooled after, sealed whole basket more air-cooled 1-6 minute;
(e) steel were put into behind the continuous push rod furnace internal heating to 550 ℃-700 ℃ of 550 ℃-700 ℃ of furnace temperatures insulation 2-8 hour;
(f) come out of the stove that to open wide whole basket air-cooled.
Wherein, furnace temperature refers to the stove temperature before workpiece is put into body of heater; Holding temperature refers to that workpiece is heated or cools off the holding temperature that is reached; Temperature fall time refers to drop to the required time of lower temperature from higher temperature.After the normalizing method that provides with technical solution of the present invention carries out a normalizing, do not need secondary normalizing, hardness just can reach 156HBS-207HBS after the normalizing of converted steel, and metallographic structure just can reach ferrite and add perlite, no bainite.
As preferably, the furnace temperature of described step (a) is 850 ℃-910 ℃.
As preferably, the holding temperature of described step (a) is 860 ℃-900 ℃.
As preferably, the soaking time of described step (a) is 0.5-3 hour.
As preferably, the soaking time of described step (b) is 1-5 hour.
As preferably, the reheat temperature of described step (b) is 890 ℃-940 ℃.
As preferably, described step (c) is come out of the stove and was opened wide whole basket air-cooled 1-5 minute.
As preferably, the come out of the stove whole basket of sealing air-cooled 1-5 minute of described step (d).
As preferably, the furnace temperature of the continuous push rod furnace of described step (e) is 600 ℃-700 ℃.
As preferably, the soaking time of described step (e) is 2-7 hour.
Therefore, the present invention have carry out a normalizing after, do not need two to three normalizings, hardness just can reach the requirement of 156HBS-207HBS after the normalizing of SAE8620 converted steel, and metallographic structure just can reach ferrite and add perlite, no bainite, technology is comparatively simple, has reduced the characteristics of tooling cost.
Description of drawings
Accompanying drawing 1 is to amplify 1000 times metallograph after the former normalizing;
Accompanying drawing 2 is to amplify 1000 times metallograph after the normalizing of the present invention.
Embodiment
Below by specific embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1: it is 890 ℃ continuous push rod furnace that SAE8620 steel finish mix base is put into the stove temperature, material base is heated to 890 ℃, insulation is after 1 hour in stove, be warming up to 910 ℃, insulation is after 2 hours in stove, come out of the stove and opened wide whole basket air-cooled 2 minutes, sealed whole basket air-cooled 2 minutes at once, steel were put into behind the continuous push rod furnace internal heating to 620 ℃ of 620 ℃ of furnace temperatures insulation again 3 hours at once, the whole basket of coming out of the stove is air-cooled, can obtain hardness is 156HBS-207HBS (adopting the metal static hardness test method of GB GB231-84 regulation to measure), and metallographic structure (as Fig. 2) adds lamellar pearlite for ferrite, the machining of no bainite normalizing material.
Embodiment 2: it is 880 ℃ continuous push rod furnace that SAE8620 steel finish mix base is put into the stove temperature, material base is heated to 880 ℃, insulation is after 2 hours in stove, be warming up to 920 ℃, insulation is after 3 hours in stove, come out of the stove and opened wide whole basket air-cooled 3 minutes, sealed whole basket air-cooled 2 minutes at once, steel were put into behind the continuous push rod furnace internal heating to 640 ℃ of 640 ℃ of furnace temperatures insulation again 4 hours at once, the whole basket of coming out of the stove is air-cooled, can obtain hardness is 156HBS-207HBS (adopting the metal static hardness test method of GB GB231-84 regulation to measure), and metallographic structure (as Fig. 2) adds lamellar pearlite for ferrite, the machining of no bainite normalizing material.
Embodiment 3: it is 910 ℃ continuous push rod furnace that SAE8620 steel finish mix base is put into the stove temperature, material base is heated to 910 ℃, insulation is after 1 hour in stove, be warming up to 930 ℃, insulation is after 2 hours in stove, come out of the stove and opened wide whole basket air-cooled 2 minutes, sealed whole basket air-cooled 3 minutes at once, steel were put behind the continuous push rod furnace internal heating to 650 ℃ of 650 ℃ of people's furnace temperatures insulation again 2 hours at once, the whole basket of coming out of the stove is air-cooled, can obtain hardness is 156HBS-207HBS (adopting the metal static hardness test method of GB GB231-84 regulation to measure), and metallographic structure (as Fig. 2) adds lamellar pearlite for ferrite, the machining of no bainite normalizing material.
Embodiment 4: it is 860 ℃ continuous push rod furnace that SAE8620 steel finish mix base is put into the stove temperature, material base is heated to 860 ℃, insulation is after 2 hours in stove, be warming up to 900 ℃, insulation is after 2 hours in stove, come out of the stove and opened wide whole basket air-cooled 4 minutes, sealed whole basket air-cooled 2 minutes at once, steel were put into behind the continuous push rod furnace internal heating to 660 ℃ of 660 ℃ of furnace temperatures insulation again 3 hours at once, the whole basket of coming out of the stove is air-cooled, can obtain hardness is 156HBS-207HBS (adopting the metal static hardness test method of GB GB231-84 regulation to measure), and metallographic structure (as Fig. 2) adds lamellar pearlite for ferrite, the machining of no bainite normalizing material.
Embodiment 5: it is 870 ℃ continuous push rod furnace that SAE8620 steel finish mix base is put into the stove temperature, material base is heated to 870 ℃, insulation is after 0.5 hour in stove, be warming up to 890 ℃, insulation is after 1 hour in stove, come out of the stove and opened wide whole basket air-cooled 1 minute, sealed whole basket air-cooled 1 minute at once, steel were put into behind the continuous push rod furnace internal heating to 550 ℃ of 550 ℃ of furnace temperatures insulation again 2 hours at once, the whole basket of coming out of the stove is air-cooled, can obtain hardness is 156HBS-207HBS (adopting the metal static hardness test method of GB GB231-84 regulation to measure), and metallographic structure (as Fig. 2) adds lamellar pearlite for ferrite, the machining of no bainite normalizing material.
Embodiment 6: it is 850 ℃ continuous push rod furnace that SAE8620 steel finish mix base is put into the stove temperature, material base is heated to 850 ℃, insulation is after 4 hours in stove, be warming up to 910 ℃, insulation is after 6 hours in stove, come out of the stove and opened wide whole basket air-cooled 1 minute, sealed whole basket air-cooled 4 minutes at once, steel were put into behind the continuous push rod furnace internal heating to 650 ℃ of 650 ℃ of furnace temperatures insulation again 8 hours at once, the whole basket of coming out of the stove is air-cooled, can obtain hardness is 156HBS-207HBS (adopting the metal static hardness test method of GB GB231-84 regulation to measure), and metallographic structure (as Fig. 2) adds lamellar pearlite for ferrite, the machining of no bainite normalizing material.
Embodiment 7: it is 930 ℃ continuous push rod furnace that SAE8620 steel finish mix base is put into the stove temperature, material base is heated to 930 ℃, insulation is after 0.5 hour in stove, be warming up to 950 ℃, insulation is after 1 hour in stove, come out of the stove and opened wide whole basket air-cooled 6 minutes, sealed whole basket air-cooled 6 minutes at once, steel were put into behind the continuous push rod furnace internal heating to 700 ℃ of 700 ℃ of furnace temperatures insulation again 2 hours at once, the whole basket of coming out of the stove is air-cooled, can obtain hardness is 156HBS-207HBS (adopting the metal static hardness test method of GB GB231-84 regulation to measure), and metallographic structure (as Fig. 2) adds lamellar pearlite for ferrite, the machining of no bainite normalizing material.
Claims (10)
1. the normalizing heat treatment technique of a SAE8620 converted steel is characterized in that processing step is:
(a), steel being put into furnace temperature is insulation 0.5-4 hour behind 850 ℃-930 ℃ the continuous push rod furnace internal heating to 850 ℃-930 ℃;
(b) insulation 1-6 hour behind the reheat to 890 ℃-950 ℃;
(c) come out of the stove and opened wide whole basket air-cooled 1-6 minute;
(d) come out of the stove open wide air-cooled after, sealed whole basket more air-cooled 1-6 minute;
(e) steel being put into furnace temperature is insulation 2-8 hour behind 550 ℃-700 ℃ the continuous push rod furnace internal heating to 550 ℃-700 ℃;
(f) come out of the stove that to open wide whole basket air-cooled.
2. the normalizing heat treatment technique of SAE8620 converted steel according to claim 1, the furnace temperature that it is characterized in that described step (a) are 850 ℃-910 ℃.
3. the normalizing heat treatment technique of SAE8620 converted steel according to claim 1, the holding temperature that it is characterized in that described step (a) are 860 ℃-900 ℃.
4. the normalizing heat treatment technique of SAE8620 converted steel according to claim 1, the soaking time that it is characterized in that described step (a) is 0.5-3 hour.
5. the normalizing heat treatment technique of SAE8620 converted steel according to claim 1, the soaking time that it is characterized in that described step (b) is 1-5 hour.
6. the normalizing heat treatment technique of SAE8620 converted steel according to claim 1, the reheat temperature that it is characterized in that described step (b) are 890 ℃-940 ℃.
7. the normalizing heat treatment technique of SAE8620 converted steel according to claim 1 is characterized in that described step (c) is come out of the stove to open wide whole basket air-cooled 1-5 minute.
8. the normalizing heat treatment technique of SAE8620 converted steel according to claim 1 is characterized in that the come out of the stove whole basket of sealing air-cooled 1-5 minute of described step (d).
9. the normalizing heat treatment technique of SAE8620 converted steel according to claim 1, the furnace temperature that it is characterized in that the continuous push rod furnace of described step (e) are 600 ℃-700 ℃.
10. the normalizing heat treatment technique of SAE8620 converted steel according to claim 1, the soaking time that it is characterized in that described step (e) is 2-7 hour.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699645A (en) * | 2012-06-27 | 2012-10-03 | 江苏金源锻造股份有限公司 | Isothermal normalizing process for gear of wind driven generator |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463997C (en) * | 2007-05-30 | 2009-02-25 | 太原理工大学 | Supersaturated carburizing steel |
| CN101363073B (en) * | 2008-09-10 | 2010-06-16 | 江苏太平洋精密锻造有限公司 | Isothermal normalizing technology of carburized gears steel forging |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1026499C (en) * | 1989-05-18 | 1994-11-09 | 费洛霍姆有限公司 | Heat treatment of corrosion resistant steels |
| CN1287183A (en) * | 2000-07-12 | 2001-03-14 | 董元宇 | Bearing steel suitable for the working condition of heavy load and great shock and its heat treatment process |
| CN1380435A (en) * | 2002-05-24 | 2002-11-20 | 董元宇 | High-strength high-impact toughness bearing steel and its heat treatment process |
| US6699333B1 (en) * | 1998-06-29 | 2004-03-02 | Aubert & Duval | Case hardened steel with high tempering temperature, method for obtaining same and parts formed with said steel |
-
2005
- 2005-10-26 CN CNB2005100612672A patent/CN100434543C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1026499C (en) * | 1989-05-18 | 1994-11-09 | 费洛霍姆有限公司 | Heat treatment of corrosion resistant steels |
| US6699333B1 (en) * | 1998-06-29 | 2004-03-02 | Aubert & Duval | Case hardened steel with high tempering temperature, method for obtaining same and parts formed with said steel |
| CN1287183A (en) * | 2000-07-12 | 2001-03-14 | 董元宇 | Bearing steel suitable for the working condition of heavy load and great shock and its heat treatment process |
| CN1380435A (en) * | 2002-05-24 | 2002-11-20 | 董元宇 | High-strength high-impact toughness bearing steel and its heat treatment process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699645A (en) * | 2012-06-27 | 2012-10-03 | 江苏金源锻造股份有限公司 | Isothermal normalizing process for gear of wind driven generator |
| CN102699645B (en) * | 2012-06-27 | 2014-08-20 | 江苏金源锻造股份有限公司 | Isothermal normalizing process for gear of wind driven generator |
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