CN101603151B - NbTi composite microalloyed free-cutting pinion steel - Google Patents
NbTi composite microalloyed free-cutting pinion steel Download PDFInfo
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- CN101603151B CN101603151B CN2008100508174A CN200810050817A CN101603151B CN 101603151 B CN101603151 B CN 101603151B CN 2008100508174 A CN2008100508174 A CN 2008100508174A CN 200810050817 A CN200810050817 A CN 200810050817A CN 101603151 B CN101603151 B CN 101603151B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 27
- 239000010959 steel Substances 0.000 title claims abstract description 27
- 238000005520 cutting process Methods 0.000 title claims abstract description 9
- 239000002131 composite material Substances 0.000 title abstract 3
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 11
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- 239000004615 ingredient Substances 0.000 claims description 10
- 239000010936 titanium Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 5
- 238000007670 refining Methods 0.000 abstract description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 238000005255 carburizing Methods 0.000 description 10
- 238000010791 quenching Methods 0.000 description 10
- 230000000171 quenching effect Effects 0.000 description 10
- 238000003723 Smelting Methods 0.000 description 7
- 230000006698 induction Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
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Abstract
The invention relates to NbTi composite microalloyed free-cutting pinion steel which is characterized in that Mn-Cr-Ti-Nb-S pinion steel comprises the following chemical compositions in percentage by weight: 0.20-0.25 percent of C, 0.15-0.35 percent of Si, 1.00-1.30 percent of Mn, 0.00-0.035 percent of P, 0.01-0.035 percent of S, 1.10-1.40 percent of Cr, 0.02-0.05 percent of Ti, 0.02-0.04 percent of Nb, 0.00-0.0020 percent of O and the balance of Fe. The NbTi composite microalloyed free-cutting pinion steel solves the problems of contact fatigue life caused by more titanium impurities and difficult processing, achieves the grain refining effect and increases the fatigue performance of pinions.
Description
Technical field:
The present invention relates to a kind of NbTi combined microalloying free-cutting pinion steel, particularly, belong to field of alloy steel the tighter easy cutting Mn-Cr-Ti-Nb-S Pinion Steel that is used for the back axle gear of carburizing and quenching deformation requirements.
Background technology:
Along with the raising of automobile engine power, require transmission system can bear higher load, simultaneously, for improving power density (output work of unit volume); Require the transmission system volume to reduce, thereby the supporting capacity of gear is had higher requirement, traditional 20CrMnTi steel has satisfied not requirement; For improving the supporting capacity of gear, gear material often adopts the higher heavy-load gear steel of alloying element content, like 22CrMoH, 20CrNiMoH Pinion Steel; Yet these heavy-duty gear steel capital exist price high, poor processability; The shortcoming that the carburizing and quenching distortion is big, the result often causes gear following process difficulty big, and dimensional precision is difficult to guarantee.The factor that influences the gear carburizing quenching distortion is a lot, and is wherein bigger with hardening capacity and grain fineness number influence, and research shows, reduces hardening capacity and with the increase grain size number gear carburizing quenching distortion is reduced.But, heavy-load gear steel must have certain hardening capacity, could guarantee that the large section gear can through hardening.Therefore, the strict heavy-load gear steel of carburizing and quenching deformation requirements is necessary to adopt the method for crystal grain thinning.
The grain refining of heavy-load gear steel mainly relies on the microalloying design to realize.Usually the method that adopts is the content of control Al and [N], or adds micro alloying elements such as Ti and B, and these method smelting technology control difficulty are big, grain refining effect is unstable.Japanese Patent JP2000-160288 carries out microalloying through the Nb that adds 0.03-0.06%, makes the carburizing temperature of Pinion Steel bring up to 1050 ℃.Recently domestic there are some researches show that also the Nb microalloying has significant effect (Yang Lin etc., Automobile Technology and Material, 2004, (7): 5-6) aspect the pinion crystalline grain of steel degree.But Nb microalloying Pinion Steel does not appear in the newspapers in the research of aspects such as control carburizing and quenching distortion so far.
Summary of the invention:
The object of the present invention is to provide a kind of NbTi combined microalloying free-cutting pinion steel; The novel Mn-Cr-Ti-Nb-S Pinion Steel that is used for the back axle gear; Its metallographic structure adds perlite by ferritic and constitutes, hardness is HB163 ~ 195, has solved gear owing to titanium is mingled with the problem of the contact fatigue lifes that cause more, reaches the effect of crystal grain thinning again; Improve the purpose of the fatigue property of gear, and solved the difficult processing problem again.
Technical scheme of the present invention is achieved in that a kind of NbTi combined microalloying free-cutting pinion steel, it is characterized in that: the Mn-Cr-Ti-Nb-S Pinion Steel comprises that by weight percentage following chemical ingredients is C:0.20～0.25%, Si:0.15～0.35%; Mn:1.00～1.30%, P0.00～0.035%, S:0.01～0.035%; Cr:1.10～1.40%, Ti:0.02～0.05%, Nb:0.02～0.04%; [O] 0.00～0.0020%, all the other are the Fe of equal amount.
Positively effect of the present invention is that the new gear steel has reduced Ti content, and control S content has increased the Nb microalloy element.Ti amount is controlled to be 0.02～0.05% from original 0.04～0.10%; The Nb that increases is that 0.02～0.04%S is controlled in 0.0 1～0.035% scope; So not only solved gear owing to titanium is mingled with the problem of the contact fatigue lifes that cause more, reaches the effect of crystal grain thinning again; Improve the purpose of the fatigue property of gear, and solved the difficult processing problem again.
Embodiment:
Below in conjunction with embodiment the present invention is done further description:
Embodiment 1:
Pinion Steel comprises following chemical ingredients C:0.25% by weight percentage, Si:0.29%, and Mn:1.14%, P0.017%, S:0.015%, Cr:1.19%, Ti:0.053%, Nb:0.032%, [O]: 0.0010, the Fe surplus; Use the 150kg vacuum induction furnace smelting.
Embodiment 2:
Pinion Steel comprises following chemical ingredients C:0.23% by weight percentage, Si:0.30%, and Mn:1.05%, P0.012%, S:0.017%, Cr:1.15%, Ti:0.045%, Nb:0.030%, [O]: 0.0012, the Fe surplus; Use the 150kg vacuum induction furnace smelting.
Embodiment 3:
Pinion Steel comprises following chemical ingredients C:0.21% by weight percentage, Si:0.32%, Mn:1.10%, P0.008%, S:0.018%, Cr:1.20%, Ti:0.036%, Nb:0.033%, O:0.0014, Fe surplus; Use the 150kg vacuum induction furnace smelting.
Embodiment 4:
Pinion Steel comprises following chemical ingredients C:0.22% by weight percentage, Si:0.30%, and Mn:1.08%, P0.008%, S:0.010%, Cr:1.22%, Ti:0.038%, Nb:0.031%, [O]: 0.0015%, the Fe surplus; Use the 150kg vacuum induction furnace smelting.
Embodiment 5:
Pinion Steel comprises following chemical ingredients C:0.20% by weight percentage, Si:0.34%, and Mn:1.06%, P0.006%, S:0.012%, Cr:1.22%, Ti:0.038%, Nb:0.048%, [O]: 0.0010%, the Fe surplus; Use the 150kg vacuum induction furnace smelting.
According to above-mentioned set chemical ingredients scope; On the 150kg vacuum induction furnace, smelted 5 stoves (heat (batch) number 1-5) steel of the present invention, 2 stove compared steel, the commercial Pinion Steel that also has two stoves (heat (batch) number) to smelt in addition through UHP (uhp electric arc furnace)+LF (external refining)+VD (vacuum outgas) technology; Its concrete chemical ingredients is as shown in table 1; Pouring molten steel becomes ingot, and processes bar through forging, and directly is processed into grain fineness number, non-metallic inclusion, hardening capacity, banded structure standard test specimen; And carry out corresponding test, its assay normal room temperature tension specimen as shown in table 2 (L by GB
0=5d
0, d
0=5mm, summer are than the sample of U type notched impact specimen 10mm * 10mm * 55mm); Handle through 900 ℃, 30 minutes air coolings to 650 ℃, 90 minutes isothermal annealings before the sample processing; Carry out roughing then; Reserve grinding tolerance and after carburizing in 930 ℃, 3 hours, be cooled to 850 ℃ of oil quenchings, after air cooling after 190 ℃, 4 hours low-temperaturetemperings, it is as shown in table 3 that its mechanical property is surveyed in the correct grinding back.
Metallographic specimen is cooled to 850 ℃ of oil quenchings with the distortion sample after carburizing in 930 ℃, 3 hours, after air cooling after 190 ℃, 4 hours low-temperaturetemperings.After heat treatment, the surface hardness of sample is about 60HRC, and effective case depth is 0.80-1.20, and it is 2 grades that surface martensite adds residual austenite, and carbide surface is 1 grade.Through measuring of the variation of distortion sample break place apart from size, characterize the degree of quenching strain with deformation rate R, it defines as follows:
R＝(D-D
0)/D
0×100％
R is a deformation rate in the formula, D
0Be respectively sample break place, processing front and back distance with D.Deformation rate result lists in the table 3, from table 3 result.Can find out that the tensile strength of steel of the present invention, impelling strength all are higher than 20CrMnTiH and 20CrMoH, under identical carburizing and quenching tempered condition, its deformation rate is lower than 20CrMnTiH and 20CrMoH.Its each item performance index of two stove steel of special steel smelting have all reached design requirements northeastward, can carry out stably manufactured through the production line of steel mill.
The chemical ingredients of table 1 embodiment and compared steel (%)
The grain fineness number of table 2 embodiment and compared steel, non-metallic inclusion, hardening capacity, banded structure
The mechanical property of table 3 embodiment and compared steel and deformation rate
Claims (1)
1. NbTi combined microalloying free-cutting pinion steel, it is characterized in that: the Mn-Cr-Ti-Nb-S Pinion Steel comprises that by weight percentage following chemical ingredients is C:0.20%, Si:0.15%; Mn:1.00%, P:0.035%, S:0.01%; Cr:1.10%, Ti:0.02%, Nb:0.02%; [O]: 0.0020%, all the other are the Fe of equal amount.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100508174A CN101603151B (en) | 2008-06-11 | 2008-06-11 | NbTi composite microalloyed free-cutting pinion steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100508174A CN101603151B (en) | 2008-06-11 | 2008-06-11 | NbTi composite microalloyed free-cutting pinion steel |
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| Publication Number | Publication Date |
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| CN101603151A CN101603151A (en) | 2009-12-16 |
| CN101603151B true CN101603151B (en) | 2012-07-18 |
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| CN2008100508174A Expired - Fee Related CN101603151B (en) | 2008-06-11 | 2008-06-11 | NbTi composite microalloyed free-cutting pinion steel |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080188B (en) * | 2010-12-24 | 2013-01-02 | 山东钢铁股份有限公司 | CrNiMo series easily cut pinion steel and manufacturing method thereof |
| CN103361559B (en) * | 2013-07-18 | 2016-06-29 | 首钢总公司 | A kind of Nb, Ti combined microalloying high-temperature carburizing pinion steel |
| CN113637915B (en) * | 2021-08-18 | 2022-10-11 | 马鞍山钢铁股份有限公司 | Nb-Ti-B microalloyed carburized gear steel and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1514884A (en) * | 2002-07-03 | 2004-07-21 | 三菱制钢株式会社 | Easy-to-cut steel containing sulfure for mechanical structure |
| CN1550562A (en) * | 2003-05-09 | 2004-12-01 | ɽ�������Ƹ���ʽ���� | Free machining steel for machine structural use having improved chip disposability |
-
2008
- 2008-06-11 CN CN2008100508174A patent/CN101603151B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1514884A (en) * | 2002-07-03 | 2004-07-21 | 三菱制钢株式会社 | Easy-to-cut steel containing sulfure for mechanical structure |
| CN1550562A (en) * | 2003-05-09 | 2004-12-01 | ɽ�������Ƹ���ʽ���� | Free machining steel for machine structural use having improved chip disposability |
Non-Patent Citations (1)
| Title |
|---|
| 杨卫中.汽车用齿轮钢20CrMnTiH-1的研制.《大型铸锻件》.2007,(第3期),18-21，33. * |
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| CN101603151A (en) | 2009-12-16 |
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