WO2000009776A1 - Cementation selective destinee a des articles en metal - Google Patents

Cementation selective destinee a des articles en metal Download PDF

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Publication number
WO2000009776A1
WO2000009776A1 PCT/US1998/016557 US9816557W WO0009776A1 WO 2000009776 A1 WO2000009776 A1 WO 2000009776A1 US 9816557 W US9816557 W US 9816557W WO 0009776 A1 WO0009776 A1 WO 0009776A1
Authority
WO
WIPO (PCT)
Prior art keywords
article
carbides
temperature
carbon
carburizing
Prior art date
Application number
PCT/US1998/016557
Other languages
English (en)
Inventor
Steven V. Marx
Peter C. Williams
Original Assignee
Swagelok Company
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 Swagelok Company filed Critical Swagelok Company
Priority to PCT/US1998/016557 priority Critical patent/WO2000009776A1/fr
Priority to AU90166/98A priority patent/AU9016698A/en
Publication of WO2000009776A1 publication Critical patent/WO2000009776A1/fr

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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
    • C23C8/04—Treatment of selected surface areas, e.g. using masks

Definitions

  • the present invention relates to processing techniques for articles of stainless steel
  • One example is a ferrule used as part of a fluid coupling for joining tube
  • ferrous based alloys are known and used other than stainless steel.
  • case hardening As case hardening.
  • the concept of case hardening is to transform a relatively thin layer of
  • the article thus retains in bulk the desired formability of stainless steel without the softness of the standard chemistry base metal at the article surface.
  • Stainless steel alloy parts are case hardened by a process generally known as
  • Carburization is a process by which carbon atoms are diffused into the
  • an article of manufacture is
  • the present invention also contemplates methods for producing a selectively case
  • invention further contemplates a product made by such a process.
  • the invention may take physical form in certain parts and arrangements of parts,
  • Fig. 1 is an elevation in longitudinal cross-section of a conventional ferrule
  • Figs. 2A-2C illustrate diagrammatically a low temperature selective case
  • a conventional ferrule 10 is illustrated. This ferrule 10 is
  • alloy 316 including but not limited to alloy 316, alloy 316L, and alloy 304 stainless
  • alloy 600 alloy 600
  • alloy C-276 alloy 20 Cb, to name a few examples.
  • the ferrule 10 is illustrated in Fig. 1 in partial cross-section only. This particular
  • ferrule is a rear ferrule that is used as part of a two ferrule system. Such ferrules and
  • ferrule systems including the ferrule geometry are well known and are fully described in
  • the ferrule 10 is characterized by a tapered nose portion 12, a central body 14 and
  • the rear drive surface 16 engages a wall of a
  • ferrule 10 to be driven radially inward to grip a tube end.
  • the geometry of the ferrule 10 illustrated in Fig. 1 is exemplary in nature and will vary substantially depending on the
  • ferrule 10 could also be used in a single ferrule system in
  • a common but not exclusive material for the ferrule 10 is 316 stainless steel alloy.
  • portion 12 can be selectively case hardened, overall performance of the ferrule system can
  • case hardening means to provide a relatively thin carburized layer
  • Carburization in general is a process by which carbon atoms are diffused into the
  • chromium oxide layer must be removed. This step is generally known as activation or de-passivation. The surface must be activated because the oxide layer presents a
  • the surface can be carburized by diffusion at an elevated temperature.
  • the diffusion process can be accelerated by performing the carburization at a high
  • Carbides tend to reduce the chromium of the base alloy in some cases.
  • invention contemplates a carburization process for selective case hardening that is
  • chromium bearing alloys such as 316 stainless steel for example, carbides tend to readily
  • hardening processes of the present invention are performed at a temperature less than
  • carburization is
  • the invention contemplates a time-temperature
  • Figs. 2A-2C illustrate in a representative manner (and in partial cross-section) the
  • steps of the process are 1 ) applying a carbon blocking mask over surface areas of the
  • Step 1) can be performed in at least two
  • the article 10 has a carbon blocking mask 20 applied over the entire
  • the carbon blocking mask 20 is formed of copper that
  • the nose area 22 has been removed, in this example the nose area 22, such as by chemical etching, to
  • the etching process can be achieved in any number of ways. In
  • the nose portion 22 is easily accessed and the copper can be etched by
  • the exposed unmasked portion 22 is passivated or de-activated and forms a chromium
  • the passive oxide layer that forms over the unmasked area 22 is
  • the article is exposed to a hydrogen
  • halide gas mixture such as hydrogen chloride (HCl) and nitrogen at one atmosphere and
  • HCl will attack, for example, a
  • a thicker copper mask can also be
  • activating gases include but are not limited to
  • the unmasked areas After activation of the unmasked areas, in one embodiment of the invention, the
  • the temperature for diffusion is kept below about
  • the carburizing gas mixture includes carbon
  • the diffusion process can take up to two
  • the article can be case hardened to a sufficient depth without carbides
  • the activating gas is purged from the gas
  • exemplary gas mixture is 0.5-60% volume carbon monoxide and 10-50% volume hydrogen, remainder nitrogen, at one atmosphere. Again, the carburization diffusion is
  • Fig. 2C shows the end result after carburization. After the carbon atoms are
  • hardened portion 30 of the article 10 has been formed that is harder than the remaining
  • This thickness is but one example.
  • the depth of the diffusion will depend on
  • the copper mask 20 has been removed as by etching for example, after the diffusion
  • An article comprising:
  • a body comprising a metal alloy
  • said second portion being less than the entire body.
  • a body comprising a chromium bearing alloy
  • a method for selectively carburizing an article comprising:

Landscapes

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

Abstract

Un article en métal sélectivement durci en surface par cémentation au carbone à basse température comprend un corps constitué d'un alliage en nickel chromifère ou à base de fer, tel que par exemple de l'acier inoxydable. Le corps comporte des première et deuxième parties présentant respectivement des première et deuxième caractéristiques de dureté, la deuxième partie étant moins importante que le corps tout entier et étant sensiblement dépourvue de carbures métalliques. Un procédé de cémentation sélective par cémentation au carbone à basse température consiste à appliquer un masque arrêtant le carbone sur les zones superficielles de l'article qui ne seront pas cémentées au carbone; à activer les zones superficielles qui doivent être cémentées au carbone; à diffuser du carbone dans les zones superficielles activées à une température inférieure à celle à laquelle se forment les carbures métalliques; puis à éliminer le masque arrêtant le carbone.
PCT/US1998/016557 1998-08-12 1998-08-12 Cementation selective destinee a des articles en metal WO2000009776A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US1998/016557 WO2000009776A1 (fr) 1998-08-12 1998-08-12 Cementation selective destinee a des articles en metal
AU90166/98A AU9016698A (en) 1998-08-12 1998-08-12 Selective case hardening for metal articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1998/016557 WO2000009776A1 (fr) 1998-08-12 1998-08-12 Cementation selective destinee a des articles en metal

Publications (1)

Publication Number Publication Date
WO2000009776A1 true WO2000009776A1 (fr) 2000-02-24

Family

ID=22267651

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/016557 WO2000009776A1 (fr) 1998-08-12 1998-08-12 Cementation selective destinee a des articles en metal

Country Status (2)

Country Link
AU (1) AU9016698A (fr)
WO (1) WO2000009776A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1471297A2 (fr) * 2001-02-06 2004-10-27 Swagelok Company Raccord de tube à bague d'étanchéité séparée
CN102828145A (zh) * 2012-08-09 2012-12-19 武汉材料保护研究所 一种实现奥氏体不锈钢强化和耐蚀的低温气体渗碳方法
WO2014143361A1 (fr) * 2013-03-15 2014-09-18 United Technologies Corporation Procédé de traitement d'alliages d'acier pour engrenages
CN105683404A (zh) * 2013-10-22 2016-06-15 Dk-Lok公司 低温盐浴局部热处理方法
CN105683405A (zh) * 2013-10-22 2016-06-15 Dk-Lok公司 局部碳氮共渗热处理的不锈钢套圈及其制造方法
WO2016094638A1 (fr) * 2013-12-10 2016-06-16 Parker-Hannifin Corporation Embout à dureté à couches multiples et procédé
CN106222369A (zh) * 2016-08-24 2016-12-14 杭州持正科技股份有限公司 发动机正时链条销轴及低温渗碳工艺
EP3061835A4 (fr) * 2013-10-22 2017-07-12 DK-LOK Corporation Procédé de traitement thermique partiel utilisant des couches métalliques doubles
US10605387B2 (en) 2013-12-10 2020-03-31 Parker-Hannifin Corporation Multiple layer hardness ferrule and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1759690A (en) * 1928-11-23 1930-05-20 Singer Mfg Co Metal-hardening process
US3344817A (en) * 1965-05-28 1967-10-03 Illinois Tool Works Method of selectively hardening a corrosion resistant part and the article produced thereby
FR2236016A1 (fr) * 1973-07-03 1975-01-31 British Steel Corp
GB1559690A (en) * 1976-11-10 1980-01-23 British Steel Corp Treatment of steel products
EP0678589A1 (fr) * 1994-04-18 1995-10-25 Daido Hoxan Inc. Procédé de cémentation de métal austénitique et produits métalliques austénitiques cémentés

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1759690A (en) * 1928-11-23 1930-05-20 Singer Mfg Co Metal-hardening process
US3344817A (en) * 1965-05-28 1967-10-03 Illinois Tool Works Method of selectively hardening a corrosion resistant part and the article produced thereby
FR2236016A1 (fr) * 1973-07-03 1975-01-31 British Steel Corp
GB1559690A (en) * 1976-11-10 1980-01-23 British Steel Corp Treatment of steel products
EP0678589A1 (fr) * 1994-04-18 1995-10-25 Daido Hoxan Inc. Procédé de cémentation de métal austénitique et produits métalliques austénitiques cémentés

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1471297A2 (fr) * 2001-02-06 2004-10-27 Swagelok Company Raccord de tube à bague d'étanchéité séparée
EP1471297A3 (fr) * 2001-02-06 2010-06-02 Swagelok Company Raccord de tube a bague d'etancheite separee
CN102828145A (zh) * 2012-08-09 2012-12-19 武汉材料保护研究所 一种实现奥氏体不锈钢强化和耐蚀的低温气体渗碳方法
WO2014143361A1 (fr) * 2013-03-15 2014-09-18 United Technologies Corporation Procédé de traitement d'alliages d'acier pour engrenages
US10202666B2 (en) 2013-03-15 2019-02-12 United Technologies Corporation Process for treating steel alloys for gears
EP3061842A1 (fr) * 2013-10-22 2016-08-31 DK-LOK Corporation Procédé de traitement thermique partiel en bain de sel à basse température
EP3061843A1 (fr) * 2013-10-22 2016-08-31 DK-LOK Corporation Virole en acier inoxydable traitée par la chaleur partiellement cémentée, et son procédé de fabrication
CN105683405A (zh) * 2013-10-22 2016-06-15 Dk-Lok公司 局部碳氮共渗热处理的不锈钢套圈及其制造方法
JP2017501307A (ja) * 2013-10-22 2017-01-12 ディケイ‐ロック・コーポレイションDk‐Lok Corporation 部分浸炭窒化熱処理されたステンレス製フェルール及びその製造方法
EP3061843A4 (fr) * 2013-10-22 2017-05-03 DK-LOK Corporation Virole en acier inoxydable traitée par la chaleur partiellement cémentée, et son procédé de fabrication
EP3061842A4 (fr) * 2013-10-22 2017-05-03 DK-LOK Corporation Procédé de traitement thermique partiel en bain de sel à basse température
EP3061835A4 (fr) * 2013-10-22 2017-07-12 DK-LOK Corporation Procédé de traitement thermique partiel utilisant des couches métalliques doubles
CN105683404A (zh) * 2013-10-22 2016-06-15 Dk-Lok公司 低温盐浴局部热处理方法
WO2016094638A1 (fr) * 2013-12-10 2016-06-16 Parker-Hannifin Corporation Embout à dureté à couches multiples et procédé
EP3614028A1 (fr) * 2013-12-10 2020-02-26 Parker-Hannifin Corporation Férule à couches de dureté multiples et procédé
US10605387B2 (en) 2013-12-10 2020-03-31 Parker-Hannifin Corporation Multiple layer hardness ferrule and method
CN106222369A (zh) * 2016-08-24 2016-12-14 杭州持正科技股份有限公司 发动机正时链条销轴及低温渗碳工艺

Also Published As

Publication number Publication date
AU9016698A (en) 2000-03-06

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