JPS5675563A - Hard watch case - Google Patents

Hard watch case

Info

Publication number
JPS5675563A
JPS5675563A JP15182879A JP15182879A JPS5675563A JP S5675563 A JPS5675563 A JP S5675563A JP 15182879 A JP15182879 A JP 15182879A JP 15182879 A JP15182879 A JP 15182879A JP S5675563 A JPS5675563 A JP S5675563A
Authority
JP
Japan
Prior art keywords
hardness
base alloy
watch case
layer
hard
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.)
Pending
Application number
JP15182879A
Other languages
Japanese (ja)
Inventor
Masanobu Harada
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.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
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 Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP15182879A priority Critical patent/JPS5675563A/en
Publication of JPS5675563A publication Critical patent/JPS5675563A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

PURPOSE:To improve hardness and shock resistance by boronizing the surface layer of a Co base alloy consisting of Cr, W, Ni, C, Si, Mn and Co in specified composition and having specified micro-Vickers hardness. CONSTITUTION:A Co base alloy is formed of 3-85% Cr, 3-30% W, <=30% Ni, <=3% C, <=2% Si, 1% Mn, <=2% Fe and the rest inevitable impurities and Co in weight percentage to have microVickers hardness of 200-800. Then, the surface layer of this Co base alloy is boronized to form a surface hardened layer having hardness Hv of 700-3,000 and thickness of surface hardened layer of 10-200mu.
JP15182879A 1979-11-22 1979-11-22 Hard watch case Pending JPS5675563A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15182879A JPS5675563A (en) 1979-11-22 1979-11-22 Hard watch case

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15182879A JPS5675563A (en) 1979-11-22 1979-11-22 Hard watch case

Publications (1)

Publication Number Publication Date
JPS5675563A true JPS5675563A (en) 1981-06-22

Family

ID=15527192

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15182879A Pending JPS5675563A (en) 1979-11-22 1979-11-22 Hard watch case

Country Status (1)

Country Link
JP (1) JPS5675563A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6021371A (en) * 1983-07-12 1985-02-02 Mitsubishi Metal Corp Case of portable watch made of hard cr and cr alloy and its manufacture
JPS62170761U (en) * 1986-04-21 1987-10-29

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6021371A (en) * 1983-07-12 1985-02-02 Mitsubishi Metal Corp Case of portable watch made of hard cr and cr alloy and its manufacture
JPS62170761U (en) * 1986-04-21 1987-10-29

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