WO2007043316A1 - Materiau d'acier et son procede de production - Google Patents

Materiau d'acier et son procede de production Download PDF

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Publication number
WO2007043316A1
WO2007043316A1 PCT/JP2006/318885 JP2006318885W WO2007043316A1 WO 2007043316 A1 WO2007043316 A1 WO 2007043316A1 JP 2006318885 W JP2006318885 W JP 2006318885W WO 2007043316 A1 WO2007043316 A1 WO 2007043316A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel material
drive shaft
hardness
steel
ratio
Prior art date
Application number
PCT/JP2006/318885
Other languages
English (en)
Japanese (ja)
Inventor
Yoshimi Usui
Yutaka Sato
Masahiko Igarashi
Wataru Yanagita
Hideo Watanabe
Satoru Nakamyo
Original Assignee
Honda Motor Co., Ltd.
Sanyo Special Steel Co., Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Honda Motor Co., Ltd., Sanyo Special Steel Co., Ltd. filed Critical Honda Motor Co., Ltd.
Priority to US12/083,353 priority Critical patent/US20090110589A1/en
Publication of WO2007043316A1 publication Critical patent/WO2007043316A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron

Definitions

  • the present invention relates to a steel material and a method for manufacturing the steel material, and more particularly to a steel material suitable as a material for a drive shaft and a method for manufacturing the steel material.
  • a drive shaft that constitutes a traveling engine of an automobile is generally manufactured from a steel material.
  • This type of steel material is required to be relatively easy to cut.
  • it is necessary that the shear stress to break when applying the torsional torque to ensure the durability of the drive shaft is high, in other words, the torsional strength is high.
  • JIS-S40C equivalent material is selected as the steel material to obtain such a drive shaft.
  • Patent Document 1 discloses that a drive shaft is composed of a steel material in which the composition ratio, surface hardness, martensite ratio, and hardening depth ratio of constituent elements satisfy predetermined values. Has been proposed.
  • Patent Document 2 discloses a steel for induction hardening in which the structure area ratio of ferrite with respect to contained C and the crystal grain size of ferrite are not more than a predetermined value. According to Patent Document 2,
  • the induction hardening steel is said to be suitable as a drive shaft material.
  • Patent Document 1 Japanese Patent Laid-Open No. 10-36937
  • Patent Document 2 JP 2002-69566 A Disclosure of the invention
  • a general object of the present invention is to provide a steel material having excellent characteristics even when a small-sized member is formed.
  • a main object of the present invention is to provide a method for producing a steel material for producing the steel material.
  • a steel material having a hardened layer ratio tZr of 0.4 or more is provided, where the effective hardened depth t is the distance of surface force to reach the part showing 392 in Vickers hardness and the radius is r.
  • N in this steel material is preferably 0.01% by mass or less.
  • BN and TiN are difficult to generate. Therefore, it is possible to avoid that the hardness proceeds excessively and the workability and machinability are deteriorated while quenching proceeds without being hindered.
  • this steel material has high torsional strength, it can be suitably used as a material for a long shaft member, for example, a drive shaft.
  • FIG. 1 is an overall schematic side view along the longitudinal direction of a drive shaft that also has steel force according to the present embodiment.
  • FIG. 2 is a graph showing the relationship between the surface force distance and the hardness of the drive shaft of FIG.
  • FIG. 3 is a chart showing the components and composition ratios of each steel material.
  • FIG. 4 is a chart showing various characteristics of the steel material shown in FIG.
  • FIG. 5 is a graph showing the relationship between the hardened layer ratio rZt and the shear stress in the steel materials according to each example.
  • FIG. 1 is an overall schematic side view of the drive shaft 10 along the longitudinal direction.
  • the drive shaft 10 is a long solid body, and the diameter of the measurement site indicated by reference numeral 12 in FIG. 1 is 28 mm.
  • the steel material that is the material of the drive shaft 10 is C, in addition to iron and inevitable impurities.
  • C ensures the strength and hardness of the drive shaft 10 after quenching and tempering.
  • the composition ratio is set to 0.47-0.52% (numbers are% by mass, the same shall apply hereinafter). If it is less than 0.4%, it will be difficult to ensure hardness. On the other hand, if it exceeds 0.52%, the hardness will increase excessively, making it difficult to carry out plastic deformation or cutting, and will also show brittle fracture, resulting in a decrease in strength. In particular, the deformability in cold working is reduced.
  • Si is an element useful for deoxidation of the drive shaft 10 and is contained in the drive shaft 10 at a ratio of 0.03 to 0.15%. Less than 03%, the deoxidation effect is poor. On the other hand, if it exceeds 0.15%, the hardness will increase excessively, making it difficult to perform plastic deformation or cutting. In particular, the deformability in cold working is reduced.
  • Mn improves the induction hardenability of the drive shaft 10. That is, due to the presence of Mn, when induction hardening is performed on the drive shaft 10, the hardness is significantly increased as compared with that before the quenching.
  • the composition ratio of Mn to ensure this effect is set to 0.6 to 0.7%. If it exceeds 0.7%, the hardness will increase excessively, making it difficult to perform plastic deformation or cutting. In particular, the deformability in cold working is reduced.
  • S is a component that forms MnS together with Mn in the structure of the drive shaft 10, thereby improving the machinability of the drive shaft 10.
  • the composition ratio of S is set to 0.005 to 0.03%. If it is less than 0.005%, it is difficult to improve machinability, and if it exceeds 0.03%, the deformability particularly during cold working is reduced.
  • Ti plays a role in capturing free N in the drive shaft 10. When free N is trapped in this way, the effect of adding B described later becomes more remarkable.
  • the composition ratio of Ti is set to 0.025 to 0.04%. If it is less than 0.25%, the effect of capturing free N is poor. On the other hand, if it exceeds 0.04%, Ti will be present excessively, so that machinability and deformability during cold heating are reduced.
  • Cr is a component that improves the hardenability of the drive shaft 10. In other words, the presence of Cr significantly increases the hardness of the drive shaft 10 after quenching.
  • the composition ratio of Cr is set to 0.05-5.3%. If it is less than 0.05%, it is difficult to obtain this effect. On the other hand, if it exceeds 0.3%, Cr concentrates in the cementite. It prevents carbon from dissolving in the steel material when it is put.
  • Mo is an element useful for improving the grain boundary strength of the drive shaft 10 after quenching, and particularly for improving the torsional strength.
  • the Mo composition ratio is set to 0.04-0.09%. If it is less than 0.04%, it is difficult to improve the grain boundary strength. On the other hand, if it exceeds 0.09%, the hardness will increase excessively, making it difficult to perform plastic deformation or cutting. In particular, the deformability during cold working is reduced.
  • B is a component that improves the grain boundary strength.
  • the hardenability of the drive shaft 10 is improved. This effect is reduced when N is present in excess. This is because BN is generated from B and surplus N. Therefore, as described above, this effect is ensured by capturing N with a predetermined amount of Ti.
  • composition ratio of B is set to 0.0005 to 0.004% (5 to 40 ppm). If it is less than 5 ppm, the effect of improving the grain boundary strength is poor. If it exceeds 40 ppm, the hardenability will be reduced.
  • A1 like Si, is a component that contributes to deoxidation.
  • the composition ratio of A1 is less than 0.02%, the deoxidation effect is poor.
  • oxide impurities such as Al 2 O increase.
  • the upper limit of A1 is set to 0.04%.
  • the composition ratio of N existing in the drive shaft 10 is set to 0.01% or less.
  • the occupied area ratio of the ferrite existing in the structure is 30% or more. In other words, if the total field of view is 100%, ferrite occupies 30% or more. Due to the presence of ferrite in this proportion, the drive shaft 10 after quenching exhibits excellent toughness.
  • the hardness of the surface of the drive shaft 10 is B scale Rockwell hardness (H).
  • the drive shaft 10 is manufactured, for example, by subjecting a cylindrical workpiece made of a steel material having the above-mentioned component 'composition ratio to a turning process or a rolling process.
  • the drive shaft 10 is quenched and tempered.
  • an induction hardening method in which heating is performed with a high frequency is employed as the quenching. That is, first, the surface of the drive shaft 10 is rapidly heated by the high-frequency induction current, and then the cooling liquid is jetted onto the surface to perform rapid cooling.
  • the quenching conditions may be, for example, a heating time of 1 to 5 seconds when the frequency and output of the induced current are approximately 1 to 40 kHz and 50 to about LOOkW.
  • the drive shaft 10 is tempered in a temperature range of about 150 ° C to 200 ° C. As a result, residual stress is removed from the drive shaft 10 and the drive shaft 10 is prevented from undergoing secular change or cracking.
  • the picker hardness (H) of the surface of the drive shaft 10 subjected to the quenching and tempering treatment as described above is 640 to 730. High hardness steels generally have higher strength.
  • the toughness may not be sufficient.
  • the hardness decreases in the radial direction, that is, from the surface to the inside, as shown in FIG.
  • the hardness of the drive shaft 10 is measured from the surface side in this way, and the distance (depth) to the part indicated by 392 in H is calculated.
  • Effective hardened layer depth t For example, since the diameter of the measurement site 12 is 28 mm as described above, 14 mm on the horizontal axis of the graph in FIG. 2 represents the center in the radial direction at the measurement site 12.
  • the cured layer ratio tZr which is the ratio of the effective cured layer depth t to the radius r, is 0.4 or more. If it is less than 0.4, the thickness of the effective hardened layer is not sufficient, so that the torsional strength of the drive shaft 10 is reduced.
  • a drive shaft 10 having excellent strength and toughness is obtained.
  • the drive shaft 10 is exemplified as the steel material.
  • the final product is not limited to this. Even if it is a counter member to be used.
  • a drive shaft 10 having the shape shown in Fig. 1 is produced from the cylindrical workpiece, and the drive shaft 10 is subjected to induction hardening and tempering treatment under various conditions to obtain an effective hardened layer depth t.
  • the hardened layer ratio tZr was varied. Thereafter, a static torsion test was performed on each drive shaft 10.
  • the relationship between the hardened layer ratio tZr and the shear stress in the steel materials according to the respective examples is shown as a graph in FIG. Higher shear stress means higher static torsional strength.
  • the broken line in FIG. 5 represents the relationship between the hardened layer ratio and the shear stress in the S40C equivalent material.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

L'invention concerne un matériau d'acier de 85 à 95 HRB présentant une proportion de surface occupée par la ferrite égale ou supérieure à 30 %, et renfermant des quantités données de C, Si, Mn, S, Ti, Cr, Al et B, le reste se composant de fer et des impuretés inévitables, ledit matériau d'acier étant soumis à une trempe par induction. Après le durcissement, la surface du matériau d'acier présente une valeur HV comprise entre 640 et 730. Lorsque t représente la profondeur de durcissement effective, soit la distance entre la surface et une zone présentant une valeur HV de 392, et lorsque r représente le rayon du matériau d'acier, le rapport de couche durcie, t/r, est égal ou supérieur à 0,4.
PCT/JP2006/318885 2005-10-11 2006-09-22 Materiau d'acier et son procede de production WO2007043316A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/083,353 US20090110589A1 (en) 2005-10-11 2006-10-11 Steel Material and Process for Producing the Same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-296844 2005-10-11
JP2005296844A JP2007107029A (ja) 2005-10-11 2005-10-11 鋼材及びその製造方法

Publications (1)

Publication Number Publication Date
WO2007043316A1 true WO2007043316A1 (fr) 2007-04-19

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Country Status (4)

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US (1) US20090110589A1 (fr)
JP (1) JP2007107029A (fr)
CN (1) CN101283111A (fr)
WO (1) WO2007043316A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102414479A (zh) * 2009-04-23 2012-04-11 Ntn株式会社 形成有滚动凹槽的轴部件

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010065815A (ja) 2008-09-12 2010-03-25 Ntn Corp 動力伝達軸
JP5657316B2 (ja) * 2010-09-22 2015-01-21 Ntn株式会社 自動車部品並びにその製造方法及び製造装置
JP5619668B2 (ja) * 2011-04-18 2014-11-05 本田技研工業株式会社 冷間打抜用鋼及びこれを用いたスチールベルト用エレメント
CN108149129A (zh) * 2016-12-05 2018-06-12 宜兴市零零七机械科技有限公司 一种改进的加工中心用传动轴材料

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004124190A (ja) * 2002-10-03 2004-04-22 Jfe Steel Kk ねじり特性に優れる高周波焼もどし鋼
JP2005048211A (ja) * 2003-07-30 2005-02-24 Jfe Steel Kk 疲労特性に優れた鋼材の製造方法
JP2005194614A (ja) * 2003-01-17 2005-07-21 Jfe Steel Kk 疲労特性に優れた鋼材およびその製造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH108189A (ja) * 1996-06-14 1998-01-13 Daido Steel Co Ltd 曲げ特性に優れる高周波焼入れ用鋼ならびにその 鋼材を用いた曲げ特性に優れる高周波焼入れ部品
JPH10195589A (ja) * 1996-12-26 1998-07-28 Nippon Steel Corp 高捩り疲労強度高周波焼入れ鋼材
DE602004016953D1 (de) * 2003-01-17 2008-11-20 Jfe Steel Corp Stahlprodukt für das induktionsharten, induktionsgehärtetes bauelement, bei dem dieses verwendet wird, und herstellungsverfahren dafür

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004124190A (ja) * 2002-10-03 2004-04-22 Jfe Steel Kk ねじり特性に優れる高周波焼もどし鋼
JP2005194614A (ja) * 2003-01-17 2005-07-21 Jfe Steel Kk 疲労特性に優れた鋼材およびその製造方法
JP2005048211A (ja) * 2003-07-30 2005-02-24 Jfe Steel Kk 疲労特性に優れた鋼材の製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102414479A (zh) * 2009-04-23 2012-04-11 Ntn株式会社 形成有滚动凹槽的轴部件

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US20090110589A1 (en) 2009-04-30
CN101283111A (zh) 2008-10-08
JP2007107029A (ja) 2007-04-26

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