CN103352113A - Heat-treatment method for 48MnV non quenched and tempered steel crankshaft forging - Google Patents
Heat-treatment method for 48MnV non quenched and tempered steel crankshaft forging Download PDFInfo
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- CN103352113A CN103352113A CN2013102686622A CN201310268662A CN103352113A CN 103352113 A CN103352113 A CN 103352113A CN 2013102686622 A CN2013102686622 A CN 2013102686622A CN 201310268662 A CN201310268662 A CN 201310268662A CN 103352113 A CN103352113 A CN 103352113A
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- 48mnv
- tempered steel
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- crankshaft forging
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Abstract
The invention discloses a heat-treatment method for 48MnV non quenched and tempered steel crankshaft forging. The technical scheme comprises following steps: heating a 48MnV non quenched and tempered steel crankshaft forging until the temperature exceeds the austenitizing temperature in a range of 30 DEG C to 50 DEG C; maintaining the temperature according to the forging thickness of 1 min/mm to 3 min/mm; rapidly cooling the temperature to 300 DEG C at a speed of 30 DEG C/min to 40 DEG C/min, cooling by air in disperse, and the austenitizing temperature is 880 DEG C. Crankshaft forgings possessed by the heat-treatment method can totally meet the customers' requirement on strength index and each technical index, and are mainly used for automobile engines.
Description
Technical field
The present invention relates to a kind of heat treating method of forging, particularly related to the heat treating method of 48MnV non-hardened and tempered steel crankshaft forging.
Background technology
Non-hardened and tempered steel is that alloying element such as Mn, V, Ti, Nb and the N etc. that add trace in carbon steel form.Non-hardened and tempered steel forging for example automobile crane cools off by temperature Control Forging, temperature control when forging, can be in ferrite and pearlite disperse educt carbon (nitrogen) compound as strengthening phase, make forging after forging, not need to carry out modifier treatment, can obtain the mechanical property that structural carbon steel or structural alloy steel reach after modifier treatment.
On January 24th, 2007, disclosed Chinese invention patent specification sheets CN1900328A disclosed a kind of heat-treatment technology method of large microalloyed medium carbon steel engine crankshaft, its technical scheme is: after the bent axle control that has surplus heat after forging is cooled to 500 ℃～700 ℃, normalizing is heated to 860 ℃～900 ℃ insulations, then the speed of cooling with 40 ℃/min～60 ℃/min makes it be cooled to 500 ℃～700 ℃, ℃ come out of the stove with the speed of cooling slow cooling to 300 that is no more than 15 ℃/min again, enter the stress ageging treatment process.Although the method has been carried out the second-order phase transition processing to the non-hardened and tempered steel crankshaft forging after forging, improved ferritic relative content, has improved plasticity and toughness, because the effect of slow cooling, also so that pearlitic grain is thick, its strength property descends comparatively serious.The bent axle that adopts the method to process, its tensile strength is 776 MPa～860MPa, yield strength is 490 MPa～560MPa, can not satisfy the index of customer requirement tensile strength 〉=800 MPa, yield strength 〉=500 MPa fully.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of heat treating method of realizing 48MnV non-hardened and tempered steel crankshaft forging without the slow cooling step, adopts its intensity index of crankshaft forging of the method processing and the requirement that all technical can satisfy the client fully.
For solving the problems of the technologies described above, the heat treating method of 48MnV non-hardened and tempered steel crankshaft forging of the present invention, its technical scheme may further comprise the steps:
48MnV non-hardened and tempered steel crankshaft forging is heated to more than the austenitizing temperature 30 ℃ ~ 50 ℃, is incubated by forging thickness 1min/mm～3 min/mm, then be cooled to 300 ℃, disperse air cooling with 30 ℃/min～40 ℃/min speed of cooling.
The austenitizing temperature of described 48MnV non-hardened and tempered steel crankshaft forging is 880 ℃.
Compared with prior art, beneficial effect of the present invention is as follows:
The present invention is heated to 30 ~ 50 ℃ of insulations more than the austenitizing temperature to 48MnV non-hardened and tempered steel crankshaft forging, make the steel complete austenitizing, manganese in the while steel, the alloying elements such as vanadium are dissolved in the austenite crystal fully, by solution strengthening, improved intensity, then disperse air cooling after being cooled to 300 ℃ with the speed of cooling of 30 ℃/min～40 ℃/min, in process of cooling, manganese in the austenite crystal, the alloying elements such as vanadium can promote that intracrystalline is ferritic and separate out, plasticity and toughness have been improved, obtained simultaneously less perlite and the moderate ferrite of quantity of crystal grain, thereby guaranteed intensity and the toughness of 48MnV non-hardened and tempered steel crankshaft forging, made that intensity index and other all technical of forging all can satisfy customer requirement after the thermal treatment.Its tensile strength is that 815 MPa～830 MPa(are greater than 800 MPa of customer requirement after testing), its yield strength is that 525 MPa～553 MPa(are greater than 500 MPa of customer requirement).
In addition, because the present invention has removed the slow cooling step, thereby in actually operating, simplify technique, reduced energy consumption, shortened the production cycle, improved labour productivity.
Embodiment
The non-hardened and tempered steel of the below take China's material mark as 48MnV describes the embodiment of the method in detail as example:
The main chemical elements content (weight percent) of this steel is: C content 0.44%～0.49%, si content 0.25%～0.45%, contain Mn amount 1.00%～1.30%, P content≤0.035%, contain S amount 0.007%～0.020%, V content 0.09%～0.14%, contain Cr amount 0.10%～0.25%, ni content≤0.30%, contain Cu amount≤0.20%, surplus is Fe.
The thermal treatment process step of this steel crank shaft forging is as follows:
48MnV non-hardened and tempered steel crankshaft forging is heated to more than the austenitizing temperature 30 ℃ ~ 50 ℃, is incubated by forging thickness 1min/mm～3 min/mm, then be cooled to 300 ℃, disperse air cooling with 30 ℃/min～40 ℃/min speed of cooling.The austenitizing temperature of this steel is 880 ℃.
Adopt the heat treated 48MnV non-hardened and tempered steel of aforesaid method crankshaft forging, the comparing result of its all technical and prior art (CN1900328A) is as shown in table 1:
Table 1
As can be seen from Table 1: adopt the heat treated 48MnV non-hardened and tempered steel of the method for the invention crankshaft forging, its intensity index and other all technical all are better than prior art, and can satisfy customer requirement fully.
Claims (2)
1. the heat treating method of a 48MnV non-hardened and tempered steel crankshaft forging, it is characterized in that, may further comprise the steps: 48MnV non-hardened and tempered steel crankshaft forging is heated to more than the austenitizing temperature 30 ℃ ~ 50 ℃, be incubated by forging thickness 1min/mm～3 min/mm, then be cooled to 300 ℃ with 30 ℃/min～40 ℃/min speed of cooling, disperse air cooling.
2. the heat treating method of described 48MnV non-hardened and tempered steel crankshaft forging according to claim 1, it is characterized in that: the austenitizing temperature of described 48MnV non-hardened and tempered steel crankshaft forging is 880 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013102686622A CN103352113A (en) | 2013-06-30 | 2013-06-30 | Heat-treatment method for 48MnV non quenched and tempered steel crankshaft forging |
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| CN2013102686622A CN103352113A (en) | 2013-06-30 | 2013-06-30 | Heat-treatment method for 48MnV non quenched and tempered steel crankshaft forging |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1602742A1 (en) * | 2004-06-01 | 2005-12-07 | Kabushiki Kaisha Kobe Seiko Sho | High-strength steel for large-scaled forging, and crankshaft |
| CN101165195A (en) * | 2006-10-19 | 2008-04-23 | 中国科学院金属研究所 | Method for thinning steel microscopic structure of crank axle for vessel |
| CN101565793A (en) * | 2008-04-25 | 2009-10-28 | 天润曲轴股份有限公司 | Alloy ductile iron crankshaft and heat treatment process thereof |
| JP2011094203A (en) * | 2009-10-30 | 2011-05-12 | Honda Motor Co Ltd | Method for manufacturing crank shaft, and crank shaft |
| JP2012117095A (en) * | 2010-11-30 | 2012-06-21 | Ud Trucks Corp | Method for improving fatigue strength of cast iron material |
-
2013
- 2013-06-30 CN CN2013102686622A patent/CN103352113A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1602742A1 (en) * | 2004-06-01 | 2005-12-07 | Kabushiki Kaisha Kobe Seiko Sho | High-strength steel for large-scaled forging, and crankshaft |
| CN101165195A (en) * | 2006-10-19 | 2008-04-23 | 中国科学院金属研究所 | Method for thinning steel microscopic structure of crank axle for vessel |
| CN101565793A (en) * | 2008-04-25 | 2009-10-28 | 天润曲轴股份有限公司 | Alloy ductile iron crankshaft and heat treatment process thereof |
| JP2011094203A (en) * | 2009-10-30 | 2011-05-12 | Honda Motor Co Ltd | Method for manufacturing crank shaft, and crank shaft |
| JP2012117095A (en) * | 2010-11-30 | 2012-06-21 | Ud Trucks Corp | Method for improving fatigue strength of cast iron material |
Non-Patent Citations (3)
| Title |
|---|
| 中国机械工程学会热处理学会编: "《热处理手册-工艺基础（第4版）》", 30 April 2012, article "4.1.1.3节" * |
| 吴承建等: "《金属材料学（第2版）》", 31 August 2009, article "2.3.6.2节", pages: 39 * |
| 周悠等: "非调质钢48MnV工艺质量分析", 《金属世界》, no. 02, 30 April 2007 (2007-04-30) * |
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Application publication date: 20131016 |