GB1213190A - Process and apparatus for internally nitriding tubes - Google Patents

Process and apparatus for internally nitriding tubes

Info

Publication number
GB1213190A
GB1213190A GB6079568A GB6079568A GB1213190A GB 1213190 A GB1213190 A GB 1213190A GB 6079568 A GB6079568 A GB 6079568A GB 6079568 A GB6079568 A GB 6079568A GB 1213190 A GB1213190 A GB 1213190A
Authority
GB
United Kingdom
Prior art keywords
nitriding
tubes
tube
nitrided
activator
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
Application number
GB6079568A
Inventor
Thomas Calvin Rose
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of GB1213190A publication Critical patent/GB1213190A/en
Expired 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
    • 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

Abstract

1,213,190. Nitriding tubes. GENERAL ELECTRIC CO. Dec. 20, 1968 [Jan. 15, 1968], No. 60795/68. Heading C7U. The internal surfaces of ferrous alloy tubes are nitrided by contacting the said surfaces with an activator and flowing ammonia having a degree of dissociation between 15% and 50% through the tube at a temperature from 850‹F. to 1200‹F., the direction of ammonia flow being reversed at intervals of not greater than 30 minutes. Inert gas may be flowed through the tube while heating to and cooling from the nitriding temperature. The nitriding gas may be flowed through the tube between manifolds at either end thereof and each manifold may contain an amount of decomposable activator such as polyvinyl chloride, organic acid phosphate, ammonium chloride, ammonium bifluoride, sulphamic acid or mixtures thereof preferably in amounts up to 3 grams per square foot of surface to be nitrided.
GB6079568A 1968-01-15 1968-12-20 Process and apparatus for internally nitriding tubes Expired GB1213190A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US69799068A 1968-01-15 1968-01-15

Publications (1)

Publication Number Publication Date
GB1213190A true GB1213190A (en) 1970-11-18

Family

ID=24803453

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6079568A Expired GB1213190A (en) 1968-01-15 1968-12-20 Process and apparatus for internally nitriding tubes

Country Status (8)

Country Link
JP (1) JPS512417B1 (en)
BE (1) BE726799A (en)
CH (1) CH527278A (en)
ES (1) ES362288A1 (en)
FR (1) FR2000259A1 (en)
GB (1) GB1213190A (en)
NL (1) NL6818765A (en)
SE (1) SE345699B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2214196A (en) * 1988-01-14 1989-08-31 Skf Gmbh Case-hardening
CN114540747A (en) * 2022-01-25 2022-05-27 北京科技大学 Preparation device and application method of inner surface gradient reinforced steel pipe

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63132076U (en) * 1987-02-20 1988-08-30
NL1039971C2 (en) * 2012-12-24 2014-06-25 Bosch Gmbh Robert Heat treatment process in a manufacturing method of a ring set for a drive belt.
JP6576232B2 (en) * 2015-12-10 2019-09-18 曙ブレーキ工業株式会社 Soft-nitriding steel member and manufacturing method thereof, pressure plate, and brake pad

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2214196A (en) * 1988-01-14 1989-08-31 Skf Gmbh Case-hardening
GB2214196B (en) * 1988-01-14 1992-06-03 Skf Gmbh Process for the case hardening of rolling-bearing elements of low-alloy steel containing nickel
CN114540747A (en) * 2022-01-25 2022-05-27 北京科技大学 Preparation device and application method of inner surface gradient reinforced steel pipe

Also Published As

Publication number Publication date
JPS512417B1 (en) 1976-01-26
CH527278A (en) 1972-08-31
DE1901607B2 (en) 1975-09-25
ES362288A1 (en) 1970-12-01
BE726799A (en) 1969-07-14
FR2000259A1 (en) 1969-09-05
NL6818765A (en) 1969-07-17
DE1901607A1 (en) 1969-07-31
SE345699B (en) 1972-06-05

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees