CH561280A - Watch case with hard, rustproof surface - obtd. from steel contg. chromium, molybdenum aluminium etc., with nitriding in cracked ammonia - Google Patents

Watch case with hard, rustproof surface - obtd. from steel contg. chromium, molybdenum aluminium etc., with nitriding in cracked ammonia

Info

Publication number
CH561280A
CH561280A CH276872A CH276872A CH561280A CH 561280 A CH561280 A CH 561280A CH 276872 A CH276872 A CH 276872A CH 276872 A CH276872 A CH 276872A CH 561280 A CH561280 A CH 561280A
Authority
CH
Switzerland
Prior art keywords
hard
nitriding
watch case
obtd
chromium
Prior art date
Application number
CH276872A
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 filed Critical
Priority to CH276872D priority Critical patent/CH276872A4/xx
Priority to CH276872A priority patent/CH561280A/en
Publication of CH561280A publication Critical patent/CH561280A/en

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
    • C23C8/06—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 using gases
    • C23C8/08—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 using gases only one element being applied
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

Clock part is machined from a steel contg. 0.2-0.4% C 1.5-2% Cr, up to 0.3% of Mo, 1-1.5% of Al, rest Fe. The machined part is nitrided with cracked NH3 for 48-80 hr. at 500-520 degrees C and is allowed to cool gently, then is finally polished. Pref. the steel contains 0.35% C, 1.8% Cr, 0.2% Mo, 1.1% Al, rest Fe; nitriding is at 510 degrees C for 72 hrs. and may reach a depth of more than 0.3 mm. The part may be a watch case, and a hard, nitrided surface is combined with retention of rustproof props. Hardness exceeding 1200 HV may be attained, better than hard chroming.
CH276872A 1972-02-28 1972-02-28 Watch case with hard, rustproof surface - obtd. from steel contg. chromium, molybdenum aluminium etc., with nitriding in cracked ammonia CH561280A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CH276872D CH276872A4 (en) 1972-02-28 1972-02-28
CH276872A CH561280A (en) 1972-02-28 1972-02-28 Watch case with hard, rustproof surface - obtd. from steel contg. chromium, molybdenum aluminium etc., with nitriding in cracked ammonia

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH276872A CH561280A (en) 1972-02-28 1972-02-28 Watch case with hard, rustproof surface - obtd. from steel contg. chromium, molybdenum aluminium etc., with nitriding in cracked ammonia

Publications (1)

Publication Number Publication Date
CH561280A true CH561280A (en) 1975-04-30

Family

ID=4241171

Family Applications (2)

Application Number Title Priority Date Filing Date
CH276872A CH561280A (en) 1972-02-28 1972-02-28 Watch case with hard, rustproof surface - obtd. from steel contg. chromium, molybdenum aluminium etc., with nitriding in cracked ammonia
CH276872D CH276872A4 (en) 1972-02-28 1972-02-28

Family Applications After (1)

Application Number Title Priority Date Filing Date
CH276872D CH276872A4 (en) 1972-02-28 1972-02-28

Country Status (1)

Country Link
CH (2) CH561280A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995024001A1 (en) * 1994-03-04 1995-09-08 Konrad Damasko Wristwatch case

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995024001A1 (en) * 1994-03-04 1995-09-08 Konrad Damasko Wristwatch case

Also Published As

Publication number Publication date
CH276872A4 (en) 1974-11-29

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