EP0377307B1 - Poudre d'acier rapide - Google Patents

Poudre d'acier rapide Download PDF

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Publication number
EP0377307B1
EP0377307B1 EP89313418A EP89313418A EP0377307B1 EP 0377307 B1 EP0377307 B1 EP 0377307B1 EP 89313418 A EP89313418 A EP 89313418A EP 89313418 A EP89313418 A EP 89313418A EP 0377307 B1 EP0377307 B1 EP 0377307B1
Authority
EP
European Patent Office
Prior art keywords
speed tool
steel
carbide particles
tool steel
toughness
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP89313418A
Other languages
German (de)
English (en)
Other versions
EP0377307A1 (fr
Inventor
Yoshitomo Hitachi
Kozo Ozaki
Yukinori Matsuda
Noriyoshi Shibata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daido Steel Co Ltd
Original Assignee
Daido 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=18228524&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0377307(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Daido Steel Co Ltd filed Critical Daido Steel Co Ltd
Priority to AT89313418T priority Critical patent/ATE103993T1/de
Publication of EP0377307A1 publication Critical patent/EP0377307A1/fr
Application granted granted Critical
Publication of EP0377307B1 publication Critical patent/EP0377307B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium

Definitions

  • the present invention relates to a powdered high-speed tool steel, and provides high-speed tools having both good wear-resistance and toughness.
  • Powdered high-speed tool steels have advantages, when compared with melted materials, that fine carbide particles precipitate therein uniformly without segregation.
  • the steels thus have higher toughness, and it is possible to improve the wear-resistance by high alloying.
  • JP-A-0119645 discloses that for powdered high-speed tool steel containing tungsten, molybdenum and chromium, in order to provide a material having both desired processability and cutting performance as a tool, the alloy composition should contain large quantities of vanadium and cobalt.
  • the powder of the steel comprises 1.2-4.5% C, up to 3.0% Si, up to 3.0% Mn, 3.0-6.0% Cr, 15.0-60.0% W, 1.0-15.0% V and up to 20.0% Co, the balance being Fe, apart from any impurities, and the steel comprises 10-30.2% by volume of carbide particles having Heywood diameters of at least 1 ⁇ m.
  • W + 2Mo 15.0-60.0%.
  • the powdered high-speed tool steel is produced by spraying the molten metal with a gas or water, to rapidly cool the sprayed drops, and sintering the thus-obtained powder by means of, e.g. HIP.
  • the precipitated carbide particles are generally fine and distributed uniformly. It has been considered that the wear-resistance of the tool is high when the carbide particles in the powdered steel are relatively large, and also that the toughness of the tool is high when the carbide particles are fine.
  • this invention is based on the discovery that, contrary to the prior common understanding, the existence of relatively large carbide particles in an appropriate amount is favourable not only for the wear-resistance but also the toughness.
  • the sizes of the carbide particles can be increased, as is well known, by soaking the powdered high-speed tool steel at a high temperature for a period of time, e.g. 1150-1250°C for 2-10 hours.
  • the relatively large carbide particles content is sufficient at 20-30 volume %; at contents exceeding this level, the effect saturates. Over-soaking causes the formation of huge carbide particles, resulting in decreased toughness.
  • C 1.2 - 4.5 %
  • Si up to 3.0 %
  • Mn up to 3.0%
  • Mo up to 30.0 %
  • Weq 15.0 - 60.0 %
  • the purpose of adding relatively large amount of W to Mo is to obtain a sufficient hardness of quenching-tempering (in terms of HRC, 66 - 67 or higher), and to maintain the anti-breaking strength high (260 kgf/mm2).
  • the powdered high speed tool steel of the present invention can give tools having both the good wear resistance and the high toughness by chosing a particular alloy composition and controlling the sizes and quantities of the carbide particles therein.
  • the present invention solved this problem.
  • Evaluation of the wear resistance is expressed by relative coefficients to the comparative examples in which the coefficient is 100.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Claims (3)

  1. Acier en poudre pour outil rapide, présentant une bonne résistance à l'usure et une bonne ténacité, dans lequel la poudre d'acier 1,2 à 4,5% C, jusqu'à 3,0% Si, jusqu'à 3,0% Mn, 3,0 à 6,0% Cr, 15,0 à 60,0% W, 1,0 à 15,0% V et jusqu'à 20,0% Co, le reste étant du fer, à l'exception de quelques impuretés, et dans lequel l'acier comprend 10 à 30,2% en volume de particules de carbure ayant des diamètres de Heywood d'au moint 1 µm.
  2. Poudre d'acier selon la revendication 1, excepté que la poudre comprend en plus jusqu'à 30,0% Mo, à condition que W + 2Mo = 15,0 à 60,0%.
  3. Acier en poudre selon la revendication 2, dans lequel 2Mo/(W + 2Mo) n'est pas supérieur à 0,45.
EP89313418A 1988-12-27 1989-12-21 Poudre d'acier rapide Expired - Lifetime EP0377307B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89313418T ATE103993T1 (de) 1988-12-27 1989-12-21 Schnellstahlpulver.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP330077/88 1988-12-27
JP63330077A JP2725333B2 (ja) 1988-12-27 1988-12-27 粉末高速度工具鋼

Publications (2)

Publication Number Publication Date
EP0377307A1 EP0377307A1 (fr) 1990-07-11
EP0377307B1 true EP0377307B1 (fr) 1994-04-06

Family

ID=18228524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89313418A Expired - Lifetime EP0377307B1 (fr) 1988-12-27 1989-12-21 Poudre d'acier rapide

Country Status (4)

Country Link
EP (1) EP0377307B1 (fr)
JP (1) JP2725333B2 (fr)
AT (1) ATE103993T1 (fr)
DE (1) DE68914429T2 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0483668B1 (fr) * 1990-10-31 1996-03-13 Hitachi Metals, Ltd. Acier rapide produit par frittage de poudre et son procédé de production
JP2775614B2 (ja) * 1990-12-19 1998-07-16 株式会社クボタ 高速度鋼系焼結合金
ATE150994T1 (de) * 1991-08-07 1997-04-15 Erasteel Kloster Ab Pulvermetallurgisch hergestellter schnellarbeitsstahl
SE500008C2 (sv) * 1991-08-07 1994-03-21 Erasteel Kloster Ab Snabbstål med god varmhårdhet och slitstyrka framställt av pulver
FR2751349B1 (fr) * 1996-07-19 1998-10-02 Thyssen France Sa Acier pour outils de mise en forme
FR2751348B1 (fr) * 1996-07-19 1998-10-02 Thyssen France Sa Acier pour outils de mise en forme
US6057045A (en) * 1997-10-14 2000-05-02 Crucible Materials Corporation High-speed steel article
AT411441B (de) 2000-06-02 2004-01-26 Boehler Ybbstal Band Gmbh & Co Verbundwerkzeug
JP6096040B2 (ja) * 2013-04-17 2017-03-15 山陽特殊製鋼株式会社 高温焼戻し硬さに優れた粉末高速度工具鋼
JP6345945B2 (ja) * 2014-02-26 2018-06-20 山陽特殊製鋼株式会社 耐摩耗性に優れた粉末高速度工具鋼およびその製造方法
EP3247815A4 (fr) * 2014-12-17 2018-05-09 Uddeholms AB Alliage résistant à l'usure
SE541903C2 (en) * 2017-11-22 2020-01-02 Vbn Components Ab High hardness 3d printed steel product
JP7396256B2 (ja) * 2020-11-30 2023-12-12 Ｊｆｅスチール株式会社 圧延用ロール外層材及び圧延用複合ロール

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5172906A (en) * 1974-12-23 1976-06-24 Hitachi Metals Ltd Tankabutsuo fukashitakosokudokoguko
JPS609587B2 (ja) * 1978-06-23 1985-03-11 トヨタ自動車株式会社 耐摩耗性焼結合金
JPS57181367A (en) * 1981-04-08 1982-11-08 Furukawa Electric Co Ltd:The Sintered high-v high-speed steel and its production
JPH0674486B2 (ja) * 1987-08-18 1994-09-21 株式会社神戸製鋼所 熱間加工性に優れた高硬度焼結高速度鋼鋼塊
JPH01152242A (ja) * 1987-12-10 1989-06-14 Sanyo Special Steel Co Ltd 粉末冶金法による高靭性高速度鋼

Also Published As

Publication number Publication date
EP0377307A1 (fr) 1990-07-11
JPH02175846A (ja) 1990-07-09
DE68914429D1 (de) 1994-05-11
JP2725333B2 (ja) 1998-03-11
ATE103993T1 (de) 1994-04-15
DE68914429T2 (de) 1994-07-28

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