WO2012144423A1 - 面圧疲労強度に優れた機械構造用鋼材 - Google Patents
面圧疲労強度に優れた機械構造用鋼材 Download PDFInfo
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
Definitions
- the present invention relates to a steel for machine structures used as power transmission parts such as gears and shafts used in automobiles and industrial machines, for example, and is particularly excellent in surface fatigue strength when parts are manufactured by gas carburizing. It relates to steel materials for machine structures.
- the carburizing abnormal layer formed on the surface of the steel part by gas carburizing often involves grain boundary oxidation when a normal steel material of JIS standard is used. Grain boundary oxidation is observed in a wedge shape from the surface to the inside, and this contributes to a reduction in the surface pressure fatigue strength. Therefore, conventionally, the surface pressure fatigue strength has been improved by reducing the grain boundary oxidation.
- Patent Document 1 Japanese Patent Laid-Open No. 2000-297347
- Patent Document 2 Japanese Patent Laid-Open No. 7-258793
- JP 2000-297347 A Japanese Unexamined Patent Publication No. 7-258793
- an object of the present invention is to provide a steel material having excellent surface fatigue strength made of mechanical structural steel used as a power transmission component such as a gear or a shaft used in automobiles or industrial machines. .
- a steel material for mechanical structure having excellent surface fatigue strength wherein the steel material is in mass%, C: 0.15 to 0.35%, Si: 0.30 to 0.95%, Mn: 0.10 to 1.00%, P: 0 to 0.030%, S: 0 to 0.030%, Cr: 0.80-2.30%, Cu: 0 to 0.30%, Al: 0.008 to 0.500%, O: 0 to 0.0030%, N: 0.0020 to 0.0300%, Ni: 0 to 3.00%, Mo: 0 to 0.29%, Ti: 0 to 0.200%, Nb: 0 to 0.20%, B: 0 to 0.0050% Comprising the balance Fe and inevitable impurities,
- the steel material has a mass%, a parameter represented by Si + Cr-2Mn of 1.05 or more, and a parameter represented by 0.7Si + 2.5Mn + 2.0Cr + 2.5Ni + 4.0Mo of 6.30 or less.
- a machine structural steel is provided.
- the steel material may contain, by mass%, Ni, Mo, Ti, Nb and B substantially or at an inevitable impurity level.
- the steel material includes one or two of Ni: 0.20 to 3.00% and Mo: 0.05 to 0.29% in mass%. be able to.
- the steel material is, by mass%, at least one of Ni: 0.20 to 3.00% and Mo: 0.05 to 0.29%, and Ti. : 0.020 to 0.200%, Nb: 0.02 to 0.20%, and B: 0.0003 to 0.0050%.
- the steel for machine structural use having excellent surface fatigue strength is C: 0.15-0.35%, Si: 0.30-0.95%, Mn: 0.10-1. 00%, P: 0 to 0.030%, S: 0 to 0.030%, Cr: 0.80 to 2.30%, Cu: 0 to 0.30%, Al: 0.008 to 0.500 %, O: 0 to 0.0030%, N: 0.0020 to 0.0300%, Ni: 0 to 3.00%, Mo: 0 to 0.29%, Ti: 0 to 0.200%, Nb : 0 to 0.20%, B: 0 to 0.0050% (comprising), consisting of the balance Fe and unavoidable impurities, preferably consisting essentially of these elements and unavoidable impurities (consisting) Preferably it consists only of these elements and inevitable impurities (consisting of).
- the steel material according to the present invention contains C 0.15 to 0.35%, preferably 0.20 to 0.30%.
- C is an element necessary for securing the core strength after carburizing, quenching and tempering of steel as a machine structural component. If the C content is less than 0.15%, the strength cannot be ensured, and if it exceeds 0.35%, the toughness is lowered and the hardness of the material is increased, so that the workability is lowered.
- the steel material according to the present invention contains 0.30 to 0.95%, preferably 0.40 to 0.85% Si.
- Si is an element necessary for deoxidation, imparts necessary strength and hardenability to steel, and has an effect of shallowing the carburizing abnormal layer depth by addition of a certain amount or more. In order to obtain this effect, it is necessary to add 0.30% or more of Si. On the other hand, if the Si addition amount exceeds 0.95%, the hardness of the material is increased, so that workability is lowered.
- the steel according to the present invention contains 0.10 to 1.00%, preferably 0.20 to 0.80%, more preferably 0.20 to 0.55% of Mn.
- Mn is an element necessary for ensuring hardenability. However, if Mn is less than 0.10%, the effect on hardenability cannot be sufficiently obtained, and if it exceeds 1.00%, the machinability is lowered.
- the steel material according to the present invention contains 0 to 0.030% of P, typically more than 0 and 0.030% or less.
- P is an inevitable optional element contained from scrap, but when its content exceeds 0.030%, it segregates at the grain boundary and lowers properties such as impact strength and bending strength.
- the steel material according to the present invention contains 0 to 0.030% of S, typically more than 0 and 0.030% or less.
- S is an optional element that improves machinability. However, if its content exceeds 0.030%, MnS, which is a non-metallic inclusion, is produced and the toughness and fatigue strength in the transverse direction are reduced.
- the steel material according to the present invention contains 0.80 to 2.30% of Cr, preferably 1.10 to 2.15%.
- Cr is an element necessary for ensuring hardenability. However, if Cr is less than 0.80%, a sufficient effect on hardenability cannot be obtained, and if it exceeds 2.30%, carburization is inhibited, and the material hardness is increased to reduce machinability.
- the steel material according to the present invention contains 0 to 3.00% Ni, preferably 0.20 to 3.00% Ni.
- Ni is an optional element that has an action of improving hardenability and improving surface pressure fatigue strength by improving toughness.
- addition of 0.20% or more is preferable.
- adding 0.20% or more also affects the hardenability of the carburized layer.
- Ni is contained in excess of 3.00%, the workability is remarkably lowered and the cost is increased.
- the steel material according to the present invention contains 0 to 0.29% of Mo, preferably 0.05 to 0.29%.
- Mo is an optional element that enhances the surface pressure fatigue strength by enhancing hardenability and enhancing the temper softening resistance of the steel material. To obtain this effect, 0.05% or more is preferable. Moreover, adding 0.05% or more also affects the hardenability of the carburized layer. On the other hand, if the Mo content exceeds 0.29%, the workability is lowered.
- the steel material according to the present invention contains 0 to 0.30% of Cu, typically more than 0 and 0.30% or less.
- Cu is an inevitable optional element contained from scrap, but has aging properties and an effect of increasing strength. However, when Cu contains exceeding 0.30%, hot workability will be reduced.
- the steel material according to the present invention contains 0.008 to 0.500% Al, preferably 0.014 to 0.300%.
- Al is an element used as a deoxidizing material, and also binds to N and precipitates as AlN as will be described later, thereby bringing about an effect of suppressing grain coarsening.
- Al is preferably added in an amount of 0.008% or more.
- Al is added in excess of 0.500%, large alumina inclusions are formed, and fatigue characteristics and workability are deteriorated.
- the steel material according to the present invention contains B in an amount of 0 to 0.0050%, preferably 0.0003 to 0.0050%, more preferably 0.0010 to 0.0050%.
- B is an optional element that remarkably improves the hardenability of the steel when contained in a very small amount. By adding B, the amount of other alloy elements added can be reduced, which is effective in reducing the steel material cost. If B is less than 0.0003%, the effect of improving hardenability is small, whereas if it exceeds 0.0050%, the strength is lowered.
- the steel according to the present invention contains 0 to 0.0030%, typically more than 0 and 0.0030% or less, preferably 0.0020% or less.
- O is an optional element inevitably contained in the steel. However, if O exceeds 0.0030%, workability and fatigue strength are reduced due to an increase in oxide.
- the steel material according to the present invention contains N in an amount of 0.0020 to 0.0300%, preferably 0.0020 to 0.0220%.
- N precipitates finely as AlN or Nb nitride in the steel and brings about an effect of preventing coarsening of crystal grains, and 0.0020% or more needs to be added to obtain the effect.
- nitrides increase, and fatigue strength and workability decrease.
- Ti and N combine to form hard TiN, which significantly impairs the machinability. Therefore, particularly in steel to which Ti is added, N is 0.0020 to 0.0100%. It is preferable to restrict to 0.0020% to 0.0080%.
- the steel material according to the present invention contains 0 to 0.200% Ti, preferably 0.020 to 0.200% Ti.
- Ti is an optional element that combines with C in the steel to form carbides finely and has the effect of preventing grain coarsening. To obtain this effect, 0.020% or more of Ti is added. There is a need. On the other hand, since addition exceeding 0.200% impairs machinability, the upper limit is made 0.200%.
- the steel material according to the present invention contains 0 to 0.20% Nb, preferably 0.02 to 0.20%, more preferably 0.02 to 0.12%.
- Nb is an optional element that forms carbides or nitrides and has an effect of preventing grain coarsening, and in particular, nano-order-sized NbC or Nb (C, N) finely dispersed in steel causes the growth of crystal grains. Suppress. If Nb is less than 0.02%, the effect cannot be obtained, and if it exceeds 0.20%, the amount of precipitates becomes excessive and the workability deteriorates.
- the steel material according to the present invention has a mass% and a parameter expressed by Si + Cr-2Mn of 1.05 or more, preferably 1.05 to 2.30, more preferably 1.40 to 2.20.
- the carburizing abnormal layer formed by gas carburizing and quenching is an oxide formed by combining oxygen, which is slightly oxidized in the gas carburizing atmosphere, from the surface of the component, and elements such as Si, Mn, and Cr that are easily oxidized. This is caused by depleting the surrounding alloy elements and reducing the hardenability by consuming the alloy elements.
- the carburized abnormal layer is accompanied by grain boundary oxidation formed during the heating and holding of the gas carburizing, and it is considered that this acts as a surface defect to reduce the surface pressure fatigue strength.
- the steel material according to the present invention is expressed in terms of mass% by 0.7Si + 2.5Mn + 2.0Cr + 2.5Ni + 4.0Mo (a parameter expressed by 0.7Si + 2.5Mn + 2.0Cr in a steel material not including Ni and Mo).
- Is 6.30 or less preferably 3.20 to 6.30, more preferably 3.80 to 5.80.
- this parameter By controlling this parameter to 6.30 or less, it is possible to soften the hardness of the carburized abnormal layer by keeping the hardenability in the carburized layer low.
- a dense and soft carburized abnormal layer can be interposed between the contact surfaces of the parts.
- the present invention is a steel material made of steel having the steel components and parameters as described above. Gas carburizing and tempering and tempering using this steel material are used to drive power such as gears and shafts used in automobiles and industrial machinery. By producing a transmission component, a component having high surface fatigue strength can be obtained when used in these applications.
- roller pitching test piece 1 was subjected to fine particle shot peening or shot peening for comparison, and the results are shown in Table 2.
- the roller pitting life as an index of the surface fatigue strength is indicated by a strength ratio when the strength of the comparative steel 21 (corresponding to JIS SCM420) is 1.00.
- each steel of the examples of the present invention is composed of components in a predetermined range, and a parameter represented by Si + Cr-2Mn is composed of 1.05 or more, and 0.7 Si + 2.
- a parameter represented by Si + Cr-2Mn is composed of 1.05 or more, and 0.7 Si + 2.
- the parameter represented by 5Mn + 2.0Cr or the parameter represented by 0.7Si + 2.5Mn + 2.0Cr + 2.5Ni + 4.0Mo is 6.3 or less, No. of the comparative steel.
- each steel of the Example of this invention has improved the roller pitting life significantly.
- Comparative Example No. 1 subjected to shot peening or fine particle shot peening was used. 29 and No. Even compared with 30 steels, each steel of the examples of the present invention has a roller pitting life equal to or greater than those.
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Abstract
Description
C:0.15~0.35%、
Si:0.30~0.95%、
Mn:0.10~1.00%、
P:0~0.030%、
S:0~0.030%、
Cr:0.80~2.30%、
Cu:0~0.30%、
Al:0.008~0.500%、
O:0~0.0030%、
N:0.0020~0.0300%、
Ni:0~3.00%、
Mo:0~0.29%、
Ti:0~0.200%、
Nb:0~0.20%、
B:0~0.0050%
を含み、残部Fe及び不可避不純物からなり、
該鋼材が、質量%で、Si+Cr-2Mnで表されるパラメータが1.05以上であり、かつ、0.7Si+2.5Mn+2.0Cr+2.5Ni+4.0Moで表されるパラメータが6.30以下である、機械構造用鋼材が提供される。
Claims (10)
- 面圧疲労強度に優れた機械構造用鋼材であって、該鋼材が、質量%で、
C:0.15~0.35%、
Si:0.30~0.95%、
Mn:0.10~1.00%、
P:0~0.030%、
S:0~0.030%、
Cr:0.80~2.30%、
Cu:0~0.30%、
Al:0.008~0.500%、
O:0~0.0030%、
N:0.0020~0.0300%、
Ni:0~3.00%、
Mo:0~0.29%、
Ti:0~0.200%、
Nb:0~0.20%、
B:0~0.0050%
を含み、残部Fe及び不可避不純物からなり、
該鋼材が、質量%で、Si+Cr-2Mnで表されるパラメータが1.05以上であり、かつ、0.7Si+2.5Mn+2.0Cr+2.5Ni+4.0Moで表されるパラメータが6.30以下である、機械構造用鋼材。 - 前記鋼材が、質量%で、C:0.15~0.35%、Si:0.30~0.95%、Mn:0.10~1.00%、P:0~0.030%、S:0~0.030%、Cr:0.80~2.30%、Cu:0~0.30%、Al:0.008~0.500%、O:0~0.0030%、N:0.0020~0.0300%、Ni:0~3.00%、Mo:0~0.29%、Ti:0~0.200%、Nb:0~0.20%、B:0~0.0050%、残部Fe及び不可避不純物のみからなる、請求項1に記載の機械構造用鋼材。
- 前記鋼材が、Ni、Mo、Ti、Nb及びBを実質的に含まない、請求項1に記載の機械構造用鋼材。
- 前記鋼材が、Ni、Mo、Ti、Nb及びBを実質的に含まない、請求項2に記載の機械構造用鋼材。
- 前記鋼材が、質量%で、Ni:0.20~3.00%及びMo:0.05~0.29%の1種又は2種を含む、請求項1に記載の機械構造用鋼材。
- 前記鋼材が、質量%で、Ni:0.20~3.00%及びMo:0.05~0.29%の1種又は2種を含む、請求項2に記載の機械構造用鋼材。
- 前記鋼材が、質量%で、Ti:0.020~0.200%、Nb:0.02~0.20%及びB:0.0003~0.0050%のうち少なくとも1種以上を含む、請求項1に記載の機械構造用鋼。
- 前記鋼材が、質量%で、Ti:0.020~0.200%、Nb:0.02~0.20%及びB:0.0003~0.0050%、のうち少なくとも1種以上を含む、請求項2に記載の機械構造用鋼。
- 質量%で、Ni:0.20~3.00%及びMo:0.05~0.29%のうち少なくとも1種以上と、Ti:0.020~0.200%、Nb:0.02~0.20%及びB:0.0003~0.0050%のうち少なくとも1種以上とを含む、請求項1に記載の機械構造用鋼材。
- 質量%で、Ni:0.20~3.00%及びMo:0.05~0.29%のうち少なくとも1種以上と、Ti:0.020~0.200%、Nb:0.02~0.20%及びB:0.0003~0.0050%のうち少なくとも1種以上とを含む、請求項2に記載の機械構造用鋼材。
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US14/111,894 US20140030136A1 (en) | 2011-04-21 | 2012-04-12 | Steel Material for Machine Structural Use Having Excellent Contact Pressure Fatigue Strength |
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CN110592477A (zh) * | 2019-09-16 | 2019-12-20 | 中国科学院金属研究所 | 一种富Cr锰硼合金钢及其热处理方法 |
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- 2012-04-12 KR KR1020137026870A patent/KR20140014233A/ko not_active Application Discontinuation
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WO2018090682A1 (zh) * | 2016-11-15 | 2018-05-24 | 江阴兴澄特种钢铁有限公司 | 一种紧固件用高淬透性中碳低合金圆钢及其制造方法 |
CN110592477A (zh) * | 2019-09-16 | 2019-12-20 | 中国科学院金属研究所 | 一种富Cr锰硼合金钢及其热处理方法 |
CN112795854A (zh) * | 2020-12-23 | 2021-05-14 | 石家庄钢铁有限责任公司 | 高强度紧固件螺栓用钢及其生产方法 |
CN114855073A (zh) * | 2022-04-08 | 2022-08-05 | 张家港广大特材股份有限公司 | 一种高品质模铸风电齿轮钢及其制备方法 |
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JP5777090B2 (ja) | 2015-09-09 |
JP2012224928A (ja) | 2012-11-15 |
US20140030136A1 (en) | 2014-01-30 |
KR20140014233A (ko) | 2014-02-05 |
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