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JPS556424A - External part for portable watch - Google Patents

External part for portable watch

Info

Publication number
JPS556424A
JPS556424A JP7717278A JP7717278A JPS556424A JP S556424 A JPS556424 A JP S556424A JP 7717278 A JP7717278 A JP 7717278A JP 7717278 A JP7717278 A JP 7717278A JP S556424 A JPS556424 A JP S556424A
Authority
JP
Japan
Prior art keywords
external part
mirror
cooled
hours
corrosion resistance
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
JP7717278A
Other languages
Japanese (ja)
Inventor
Koshiyuu Endou
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 JP7717278A priority Critical patent/JPS556424A/en
Publication of JPS556424A publication Critical patent/JPS556424A/en
Pending legal-status Critical Current

Links

Landscapes

  • Heat Treatment Of Nonferrous Metals Or Alloys (AREA)

Abstract

PURPOSE: The external part for portable watches of superior mechanical strength, corrosion resistance and mirror-smooth gloss obtainable by adding the specific amounts of Cr, Fe, Al to Ni base material.
CONSTITUTION: The Ni base alloy containing Cr; 25 to 45%, Fe; 1 to 10% and Al; 2 to 5%. The Ni-Cr-Fe-Al alloy of the abovementioned composition is melted and is fabricated to a case for portable watches. After this is heated for 2 hours at 1250°C, it is water-cooled and is further heat-treated for 2 hours at 700°C in Ar gas atmosphere. It is then air-cooled and age-hardened. This case has high hardness of 650 to 700 in hardness Hv and has superior corrosion resistance as well. When it is mirror-surface-finished, it exhibits the gloss having the unique depth.
COPYRIGHT: (C)1980,JPO&Japio
JP7717278A 1978-06-26 1978-06-26 External part for portable watch Pending JPS556424A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7717278A JPS556424A (en) 1978-06-26 1978-06-26 External part for portable watch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7717278A JPS556424A (en) 1978-06-26 1978-06-26 External part for portable watch

Publications (1)

Publication Number Publication Date
JPS556424A true JPS556424A (en) 1980-01-17

Family

ID=13626366

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7717278A Pending JPS556424A (en) 1978-06-26 1978-06-26 External part for portable watch

Country Status (1)

Country Link
JP (1) JPS556424A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5959852A (en) * 1982-09-30 1984-04-05 Toshiba Corp Decorative goods

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5959852A (en) * 1982-09-30 1984-04-05 Toshiba Corp Decorative goods

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