EP0054962A1 - Procédé non polluant de carburation de l'acier en bain de sel fondu - Google Patents

Procédé non polluant de carburation de l'acier en bain de sel fondu Download PDF

Info

Publication number: EP0054962A1
Authority: EP; European Patent Office
Prior art keywords: salt; carburizing; bath; alkaline earth; steel
Prior art date: 1980-12-23
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.): Granted

Application number

EP81110690A

Other languages

German (de)

English (en)

Other versions

EP0054962B1 (fr

Inventor

Heinrich Dipl.-Ing. Michel

Alexander Pralea

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.)

Evonik Operations GmbH

Original Assignee

Goerig & Co & Co KG GmbH

Degussa GmbH

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.)

1980-12-23

Filing date

1981-12-22

Publication date

1982-06-30

1981-12-22 Application filed by Goerig & Co & Co KG GmbH, Goerig & Co & Co KG GmbH, Degussa GmbH filed Critical Goerig & Co & Co KG GmbH

1981-12-22 Priority to AT81110690T priority Critical patent/ATE12951T1/de

1982-06-30 Publication of EP0054962A1 publication Critical patent/EP0054962A1/fr

1985-04-24 Application granted granted Critical

1985-04-24 Publication of EP0054962B1 publication Critical patent/EP0054962B1/fr

Status Expired legal-status Critical Current

Links

150000003839 salts Chemical class 0.000 title claims abstract description 43
238000000034 method Methods 0.000 title claims abstract description 37
238000005255 carburizing Methods 0.000 title claims abstract description 28
229910000831 Steel Inorganic materials 0.000 title claims abstract description 21
239000010959 steel Substances 0.000 title claims abstract description 21
238000010791 quenching Methods 0.000 claims abstract description 8
239000003513 alkali Substances 0.000 claims abstract description 7
150000004820 halides Chemical class 0.000 claims abstract description 7
239000000203 mixture Substances 0.000 claims abstract description 6
230000000171 quenching effect Effects 0.000 claims abstract description 6
239000000463 material Substances 0.000 claims abstract description 3
XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims description 13
229910001615 alkaline earth metal halide Inorganic materials 0.000 claims description 9
238000002360 preparation method Methods 0.000 claims description 5
229910052783 alkali metal Inorganic materials 0.000 claims description 2
-1 alkali metal cyanate Chemical class 0.000 claims description 2
GKKCIDNWFBPDBW-UHFFFAOYSA-M potassium cyanate Chemical compound [K]OC#N GKKCIDNWFBPDBW-UHFFFAOYSA-M 0.000 claims description 2
239000000276 potassium ferrocyanide Substances 0.000 claims description 2
230000001105 regulatory effect Effects 0.000 claims description 2
XOGGUFAVLNCTRS-UHFFFAOYSA-N tetrapotassium;iron(2+);hexacyanide Chemical compound [K+].[K+].[K+].[K+].[Fe+2].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] XOGGUFAVLNCTRS-UHFFFAOYSA-N 0.000 claims description 2
FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims 1
ZVCDLGYNFYZZOK-UHFFFAOYSA-M sodium cyanate Chemical compound [Na]OC#N ZVCDLGYNFYZZOK-UHFFFAOYSA-M 0.000 claims 1
GTSHREYGKSITGK-UHFFFAOYSA-N sodium ferrocyanide Chemical compound [Na+].[Na+].[Na+].[Na+].[Fe+2].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] GTSHREYGKSITGK-UHFFFAOYSA-N 0.000 claims 1
239000000264 sodium ferrocyanide Substances 0.000 claims 1
235000012247 sodium ferrocyanide Nutrition 0.000 claims 1
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
XLJMAIOERFSOGZ-UHFFFAOYSA-M cyanate Chemical compound [O-]C#N XLJMAIOERFSOGZ-UHFFFAOYSA-M 0.000 abstract 1
229910052799 carbon Inorganic materials 0.000 description 4
OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
239000000956 alloy Substances 0.000 description 2
229910045601 alloy Inorganic materials 0.000 description 2
WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 2
229910001626 barium chloride Inorganic materials 0.000 description 2
239000002360 explosive Substances 0.000 description 2
VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
YBVAXJOZZAJCLA-UHFFFAOYSA-N nitric acid nitrous acid Chemical compound ON=O.O[N+]([O-])=O YBVAXJOZZAJCLA-UHFFFAOYSA-N 0.000 description 2
FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
229910001203 Alloy 20 Inorganic materials 0.000 description 1
CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
230000032683 aging Effects 0.000 description 1
238000006243 chemical reaction Methods 0.000 description 1
230000007613 environmental effect Effects 0.000 description 1
238000010438 heat treatment Methods 0.000 description 1
239000007788 liquid Substances 0.000 description 1
239000000155 melt Substances 0.000 description 1
LJYRLGOJYKPILZ-UHFFFAOYSA-N murexide Chemical compound [NH4+].N1C(=O)NC(=O)C(N=C2C(NC(=O)NC2=O)=O)=C1[O-] LJYRLGOJYKPILZ-UHFFFAOYSA-N 0.000 description 1
239000003345 natural gas Substances 0.000 description 1
LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
238000007254 oxidation reaction Methods 0.000 description 1
239000001103 potassium chloride Substances 0.000 description 1
235000011164 potassium chloride Nutrition 0.000 description 1
235000010333 potassium nitrate Nutrition 0.000 description 1
239000004323 potassium nitrate Substances 0.000 description 1
239000011833 salt mixture Substances 0.000 description 1
238000005070 sampling Methods 0.000 description 1
238000007086 side reaction Methods 0.000 description 1
239000011780 sodium chloride Substances 0.000 description 1
235000010288 sodium nitrite Nutrition 0.000 description 1
238000004448 titration Methods 0.000 description 1

Images

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
- C23C8/40—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 liquids, e.g. salt baths, liquid suspensions
- C23C8/52—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 liquids, e.g. salt baths, liquid suspensions more than one element being applied in one step
- C23C8/54—Carbo-nitriding
- C23C8/56—Carbo-nitriding of ferrous surfaces
- 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
- C23C8/40—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 liquids, e.g. salt baths, liquid suspensions
- C23C8/42—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 liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/44—Carburising
- C23C8/46—Carburising of ferrous surfaces

Definitions

the present invention relates to a method for carburizing steel in a salt bath, whereby a high cyanide content in the bath is progressively avoided.
Carburization processes for steel in a salt bath are available in various versions in the prior art, however the processes in the prior art generally have the disadvantage of having a high cyanide content in the salt bath.
This high cyanide content in the baths is questionable for environmental reasons.
a steel crucible with a capacity of 80 l is filled with 50 kg of preparation salt, which consists of 60% barium chloride, 20% sodium chloride and 20% potassium chloride.
This filling is brought to a temperature of 800 ° C by means of a heating system operated with natural gas, whereby a completely homogeneous melt is created.
the steel crucible filling is then heated to 900 ° C and then the workpieces, namely gearwheels (consisting of case hardening steel from alloy 20 MnCr 5) with a unit weight of 1 kg, are suspended from a steel wire in the aforementioned melt and carburized within 4 hours.
gearwheels consisting of case hardening steel from alloy 20 MnCr 5
the case hardening depth is 0.83 mm.
FIG. 1 shows the C content of the workpiece as a function of the edge distance; the C content is given in% by weight; the carburizing depth of the C is measured in mm.
Figure 2 shows the hardness curve of the workpiece depending on the edge distance.
the hardness is given in hardness HV1 and the edge distance in mm.
the cyanide content is checked by sampling and titration with nickel sulfate and murexide as an indicator.

Landscapes

Chemical & Material Sciences (AREA)
Chemical Kinetics & Catalysis (AREA)
Engineering & Computer Science (AREA)
Materials Engineering (AREA)
Mechanical Engineering (AREA)
Metallurgy (AREA)
Organic Chemistry (AREA)
Heat Treatment Of Articles (AREA)
Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Treatment Of Steel In Its Molten State (AREA)
Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

EP81110690A 1980-12-23 1981-12-22 Procédé non polluant de carburation de l'acier en bain de sel fondu Expired EP0054962B1 (fr)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
AT81110690T ATE12951T1 (de)	1980-12-23	1981-12-22	Umweltfreundliches verfahren zum aufkohlen von stahl im salzbad.

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE3048607		1980-12-23
DE3048607A DE3048607C2 (de)	1980-12-23	1980-12-23	Cyanidfreies Verfahren zum Aufkohlen von Stahl und Zugabesalz zur Durchführung des Verfahrens

Publications (2)

Publication Number	Publication Date
EP0054962A1 true EP0054962A1 (fr)	1982-06-30
EP0054962B1 EP0054962B1 (fr)	1985-04-24

Family

ID=6120037

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP81110690A Expired EP0054962B1 (fr)	1980-12-23	1981-12-22	Procédé non polluant de carburation de l'acier en bain de sel fondu

Country Status (4)

Country	Link
EP (1)	EP0054962B1 (fr)
AT (1)	ATE12951T1 (fr)
CH (1)	CH647002A5 (fr)
DE (2)	DE3048607C2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US6461448B1 (en)	1998-08-12	2002-10-08	Swagelok Company	Low temperature case hardening processes
US6547888B1 (en)	2000-01-28	2003-04-15	Swagelok Company	Modified low temperature case hardening processes
DE102006026883B3 (de) *	2006-06-09	2007-08-16	Durferrit Gmbh	Verfahren zum Härten von Edelstahl und Salzschmelze zur Durchführung des Verfahrens
EP2055801A1 (fr) *	2007-10-31	2009-05-06	Durferrit GmbH	Procédé destiné au durcissement de surfaces de pièces usinées en acier inoxydable et sels fondus pour l'exécution du procédé

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US6165597A (en) *	1998-08-12	2000-12-26	Swagelok Company	Selective case hardening processes at low temperature

Citations (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB1053243A (fr) *		1900-01-01

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US1952090A (en) *	1931-07-11	1934-03-27	American Cyanamid Co	Case-hardening metals

1980
- 1980-12-23 DE DE3048607A patent/DE3048607C2/de not_active Expired
1981
- 1981-08-12 CH CH519481A patent/CH647002A5/de not_active IP Right Cessation
- 1981-12-22 DE DE8181110690T patent/DE3170212D1/de not_active Expired
- 1981-12-22 EP EP81110690A patent/EP0054962B1/fr not_active Expired
- 1981-12-22 AT AT81110690T patent/ATE12951T1/de not_active IP Right Cessation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB1053243A (fr) *		1900-01-01

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, Band. 70, 1969, Zusammenfassung Nr. 22221v, seite 179 Columbus, Ohio, (US) & Metalloved. Term. Obrab. Metal 1968, (10), 8-11 Funshtein, YA.N.: "Effect of the Bath Composition on the Depth and wear Resistance of a Cyanided Layer.", * das ganze dokument * *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US6461448B1 (en)	1998-08-12	2002-10-08	Swagelok Company	Low temperature case hardening processes
US6547888B1 (en)	2000-01-28	2003-04-15	Swagelok Company	Modified low temperature case hardening processes
DE102006026883B3 (de) *	2006-06-09	2007-08-16	Durferrit Gmbh	Verfahren zum Härten von Edelstahl und Salzschmelze zur Durchführung des Verfahrens
DE102006026883B8 (de) *	2006-06-09	2007-10-04	Durferrit Gmbh	Verfahren zum Härten von Edelstahl und Salzschmelze zur Durchführung des Verfahrens
US7909943B2 (en)	2006-06-09	2011-03-22	Durferrit Gmbh	Method for hardening stainless steel and molten salt bath for realizing said process
EP2055801A1 (fr) *	2007-10-31	2009-05-06	Durferrit GmbH	Procédé destiné au durcissement de surfaces de pièces usinées en acier inoxydable et sels fondus pour l'exécution du procédé
US8083866B2 (en)	2007-10-31	2011-12-27	Durferrit Gmbh	Method for hardening the surfaces of work pieces made of stainless steel, and a molten salt bath for realizing the method

Also Published As

Publication number	Publication date
EP0054962B1 (fr)	1985-04-24
DE3048607C2 (de)	1983-07-07
CH647002A5 (de)	1984-12-28
ATE12951T1 (de)	1985-05-15
DE3048607A1 (de)	1982-07-01
DE3170212D1 (en)	1985-05-30

Legal Events

Date	Code	Title	Description
1982-04-30	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1982-06-30	AK	Designated contracting states	Designated state(s): AT BE CH DE FR GB IT LU NL SE
1982-12-08	17P	Request for examination filed	Effective date: 19820922
1984-08-21	ITF	It: translation for a ep patent filed
1984-09-12	RAP1	Party data changed (applicant data changed or rights of an application transferred)	Owner name: DEGUSSA AKTIENGESELLSCHAFT
1985-02-22	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1985-04-24	AK	Designated contracting states	Designated state(s): AT BE CH DE FR GB IT LI LU NL SE
1985-04-24	REF	Corresponds to:	Ref document number: 12951 Country of ref document: AT Date of ref document: 19850515 Kind code of ref document: T
1985-05-30	REF	Corresponds to:	Ref document number: 3170212 Country of ref document: DE Date of ref document: 19850530
1985-08-02	ET	Fr: translation filed
1985-12-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19851231
1986-02-25	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
1986-02-25	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
1986-04-16	26N	No opposition filed
1986-11-11	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: AT Payment date: 19861111 Year of fee payment: 6
1986-12-31	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: NL Payment date: 19861231 Year of fee payment: 6
1987-12-22	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: AT Effective date: 19871222
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1988-06-30	BERE	Be: lapsed	Owner name: DEGUSSA A.G. Effective date: 19871231
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1988-08-16	NLV4	Nl: lapsed or anulled due to non-payment of the annual fee
1988-08-24	GBPC	Gb: european patent ceased through non-payment of renewal fee
1988-08-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19880831
1988-08-31	REG	Reference to a national code	Ref country code: CH Ref legal event code: PL
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1990-12-31	ITTA	It: last paid annual fee
1992-12-30	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: DE Payment date: 19921230 Year of fee payment: 12
1994-09-01	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: DE Effective date: 19940901
1995-01-31	EUG	Se: european patent has lapsed	Ref document number: 81110690.5 Effective date: 19880913

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DE2334992C2 (de)	1984-08-16	Isothermisch behandeltes Gußeisen mit Kugelgraphit
DE1292464B (de)	1969-04-10	Diffusionsueberzogener Eisenmetallkoerper und Verfahren zu dessen Herstellung
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AT222157B (de)	1962-07-10	Verfahren und Vorrichtung zum Nitrieren von Metallen, insbesondere Eisenlegierungen, in alkalicyanid- und alkalicyanathaltigen Salzbädern
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