EP0103717B1 - Inertes Salzbad zum Erwärmen von Stählen - Google Patents

Inertes Salzbad zum Erwärmen von Stählen Download PDF

Info

Publication number: EP0103717B1
Authority: EP; European Patent Office
Prior art keywords: regenerator; polymeric; salt bath; bath; salt
Prior art date: 1982-08-25
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

EP83107597A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP0103717A1 (de

Inventor

Friedrich-Wilhelm Dipl.-Ing. Eysell

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

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.)

1982-08-25

Filing date

1983-08-02

Publication date

1986-04-02

1983-08-02 Application filed by Degussa GmbH filed Critical Degussa GmbH

1983-08-02 Priority to AT83107597T priority Critical patent/ATE18921T1/de

1984-03-28 Publication of EP0103717A1 publication Critical patent/EP0103717A1/de

1986-04-02 Application granted granted Critical

1986-04-02 Publication of EP0103717B1 publication Critical patent/EP0103717B1/de

Status Expired legal-status Critical Current

Links

150000003839 salts Chemical class 0.000 title claims abstract description 20
229910000831 Steel Inorganic materials 0.000 title claims abstract description 11
239000010959 steel Substances 0.000 title claims abstract description 11
238000010438 heat treatment Methods 0.000 title claims abstract description 10
OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
229910052799 carbon Inorganic materials 0.000 claims abstract description 7
239000000203 mixture Substances 0.000 claims abstract description 6
239000011833 salt mixture Substances 0.000 claims abstract description 5
150000003841 chloride salts Chemical class 0.000 claims abstract 2
-1 nitrogen-containing organic compound Chemical class 0.000 claims abstract 2
241000219112 Cucumis Species 0.000 claims description 11
235000015510 Cucumis melo subsp melo Nutrition 0.000 claims description 11
FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 claims description 11
XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 2
239000004202 carbamide Substances 0.000 claims description 2
LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical class N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 claims description 2
150000001732 carboxylic acid derivatives Chemical class 0.000 claims 1
150000004654 triazenes Chemical class 0.000 claims 1
XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 6
239000003513 alkali Substances 0.000 description 5
238000005261 decarburization Methods 0.000 description 5
229910001635 magnesium fluoride Inorganic materials 0.000 description 5
239000000155 melt Substances 0.000 description 5
229910052710 silicon Inorganic materials 0.000 description 5
239000010703 silicon Substances 0.000 description 5
239000000126 substance Substances 0.000 description 5
UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical group [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 4
150000001805 chlorine compounds Chemical class 0.000 description 4
230000007797 corrosion Effects 0.000 description 4
238000005260 corrosion Methods 0.000 description 4
238000002844 melting Methods 0.000 description 4
230000008018 melting Effects 0.000 description 4
230000008929 regeneration Effects 0.000 description 4
238000011069 regeneration method Methods 0.000 description 4
230000004580 weight loss Effects 0.000 description 4
238000005255 carburizing Methods 0.000 description 3
238000006116 polymerization reaction Methods 0.000 description 3
229910010271 silicon carbide Inorganic materials 0.000 description 3
239000010802 sludge Substances 0.000 description 3
229910000997 High-speed steel Inorganic materials 0.000 description 2
229910052784 alkaline earth metal Inorganic materials 0.000 description 2
229910001626 barium chloride Inorganic materials 0.000 description 2
238000006243 chemical reaction Methods 0.000 description 2
NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical compound ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 2
230000006378 damage Effects 0.000 description 2
JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 2
238000000034 method Methods 0.000 description 2
QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
150000002894 organic compounds Chemical class 0.000 description 2
HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
229920000877 Melamine resin Polymers 0.000 description 1
ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
239000002253 acid Substances 0.000 description 1
229910001514 alkali metal chloride Inorganic materials 0.000 description 1
229910001617 alkaline earth metal chloride Inorganic materials 0.000 description 1
150000001342 alkaline earth metals Chemical class 0.000 description 1
150000001412 amines Chemical class 0.000 description 1
238000000137 annealing Methods 0.000 description 1
QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
229910052788 barium Inorganic materials 0.000 description 1
DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
230000015572 biosynthetic process Effects 0.000 description 1
229910052796 boron Inorganic materials 0.000 description 1
150000003857 carboxamides Chemical class 0.000 description 1
NEHMKBQYUWJMIP-NJFSPNSNSA-N chloro(114C)methane Chemical compound [14CH3]Cl NEHMKBQYUWJMIP-NJFSPNSNSA-N 0.000 description 1
239000003245 coal Substances 0.000 description 1
150000001875 compounds Chemical class 0.000 description 1
239000007859 condensation product Substances 0.000 description 1
239000003599 detergent Chemical group 0.000 description 1
238000002474 experimental method Methods 0.000 description 1
239000011888 foil Substances 0.000 description 1
WSFSSNUMVMOOMR-UHFFFAOYSA-N formaldehyde Substances O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
229910002804 graphite Inorganic materials 0.000 description 1
239000010439 graphite Substances 0.000 description 1
239000012535 impurity Substances 0.000 description 1
ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
239000011777 magnesium Substances 0.000 description 1
CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
238000004519 manufacturing process Methods 0.000 description 1
JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
229940050176 methyl chloride Drugs 0.000 description 1
239000003921 oil Substances 0.000 description 1
239000001301 oxygen Substances 0.000 description 1
229910052760 oxygen Inorganic materials 0.000 description 1
239000002245 particle Substances 0.000 description 1
229910052700 potassium Inorganic materials 0.000 description 1
239000011591 potassium Substances 0.000 description 1
238000002360 preparation method Methods 0.000 description 1
239000000047 product Substances 0.000 description 1
229910052708 sodium Inorganic materials 0.000 description 1
239000011734 sodium Substances 0.000 description 1
239000007858 starting material Substances 0.000 description 1
150000003918 triazines Chemical class 0.000 description 1

Classifications

- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/46—Salt baths

Definitions

the invention relates to an inert salt bath for heating steels to austenitizing temperatures, consisting of a mixture of essentially alkali and alkaline earth chlorides and a regenerator.
the parts To harden beam parts such as tools, the parts must be heated to the austenitizing temperature. In many cases, this heating takes place in salt baths. However, heating in the salt bath must be such that the surface of the components to be hardened does not undergo any chemical changes.
the salt baths used should therefore, for example, neither exert an oxygen effect, which could result in decarburization, nor should carburization take place, which may lead to melting and thus destruction of the workpieces at appropriate hardening temperatures. Nor should they have a corrosive effect.
Salt melts for heating steel parts to the austenitizing temperature generally contain chlorides of alkali and alkaline earth metals, mostly chlorides of sodium, potassium and barium.
the composition depends on the particular application, in particular on the working temperature, i.e. the melting point of the salt mixture. Melting of this type, which are made from very pure substances, generally meet the requirements placed on the surface quality, they are inert.
the production of such glow baths from very pure substances is very expensive, so that lower-quality starting materials have to be used and the baths' inertness is thus lost.
even originally inert glow baths lose their inert character due to the introduction of impurities, in particular the inevitable introduction of iron oxide, detergent residues, processing oils, etc. This not only leads to decarburization of the workpieces, but also to an increased corrosion attack on the components and the electrodes of the furnaces containing the molten salts and thus at higher costs.
regenerators or regeneration processes are used. It is known that molten salt for high-temperature baths, for example for hardening high-speed steel, can be added with methyl chloride, thereby avoiding decarburization. However, the success of this treatment is often not sufficient and in any case only temporarily, since methyl chloride must not be introduced into the melt during the treatment of workpieces.
regenerators are e.g. Silicon or silicon carbide.
the silicon generally fulfills the desired purpose, i.e. prevents decarburization, but occasionally the silicon is sintered onto the workpiece surface, which may result in irreparable damage. In addition, it generally forms a tough sludge in the molten salt that is difficult to remove.
Silicon carbide has practically the same disadvantages as silicon itself, but above all it cannot be used if carburizing of the workpiece surface must be avoided under all circumstances.
This object was achieved according to the invention by adding 0.01 to 2% by weight of a carbon and nitrogen-containing polymeric organic compound to the salt mixture as regenerator. These compounds can be added to the bath during operation or during the preparation of the salt mixture or salts.
Polymeric triazine compounds, polymeric hydrocyanic acids, polymeric carboxamides and / or polymeric urea have proven particularly useful as regenerators.
the degree of polymerization must be chosen so that the reaction in the bath is not too stormy. In some cases degrees of polymerization n> 3 are already sufficient, but they are preferably much higher.
Suitable regenerators are triaminotriazine-formaldehyde condensation products and in particular melon, a polymerization product of f ⁇ / ! E! Amine, which can be prepared by heating melamine to temperatures of 500.degree.
nitrogen-containing polymeric organic compounds such as cyanuric acid or azulmic acid, have also proven successful.
the baths can be operated at temperatures from 700 to 1300 ° C.

Landscapes

Chemical & Material Sciences (AREA)
Engineering & Computer Science (AREA)
Thermal Sciences (AREA)
Crystallography & Structural Chemistry (AREA)
Mechanical Engineering (AREA)
Materials Engineering (AREA)
Metallurgy (AREA)
Organic Chemistry (AREA)
Physics & Mathematics (AREA)
Seasonings (AREA)
Anti-Oxidant Or Stabilizer Compositions (AREA)
Compositions Of Macromolecular Compounds (AREA)
Curing Cements, Concrete, And Artificial Stone (AREA)
Devices For Medical Bathing And Washing (AREA)
Electroplating And Plating Baths Therefor (AREA)
Heat Treatment Of Steel (AREA)
Cosmetics (AREA)
Nitrogen Condensed Heterocyclic Rings (AREA)
Lubricants (AREA)
Chemical Treatment Of Metals (AREA)
Heat Treatment Of Articles (AREA)
Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

EP83107597A 1982-08-25 1983-08-02 Inertes Salzbad zum Erwärmen von Stählen Expired EP0103717B1 (de)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
AT83107597T ATE18921T1 (de)	1982-08-25	1983-08-02	Inertes salzbad zum erwaermen von staehlen.

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE3231540		1982-08-25
DE19823231540 DE3231540A1 (de)	1982-08-25	1982-08-25	Inertes salzbad zum erwaermen von staehlen

Publications (2)

Publication Number	Publication Date
EP0103717A1 EP0103717A1 (de)	1984-03-28
EP0103717B1 true EP0103717B1 (de)	1986-04-02

Family

ID=6171642

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP83107597A Expired EP0103717B1 (de)	1982-08-25	1983-08-02	Inertes Salzbad zum Erwärmen von Stählen

Country Status (12)

Country	Link
EP (1)	EP0103717B1 (da)
JP (1)	JPS5938324A (da)
AT (1)	ATE18921T1 (da)
BR (1)	BR8304569A (da)
DE (2)	DE3231540A1 (da)
DK (1)	DK152224C (da)
ES (1)	ES525120A0 (da)
IL (1)	IL69419A (da)
IN (1)	IN160848B (da)
TR (1)	TR21551A (da)
YU (1)	YU153383A (da)
ZA (1)	ZA835229B (da)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE622802C (de) *	1932-04-15	1935-12-06	Emil Kleisinger Dr	Erhitzungsbad
DE1233423B (de) *	1961-04-28	1967-02-02	Ici Ltd	Verfahren zum Regenerieren eines zyanid-freien, geschmolzenen, zur Waermebehandlung von Metallen benutzten Salzbades
DE1264475B (de) *	1966-05-05	1968-03-28	Degussa	Salzbad zur Waermebehandlung von Stahl

1982
- 1982-08-25 DE DE19823231540 patent/DE3231540A1/de not_active Withdrawn
1983
- 1983-07-08 JP JP58123556A patent/JPS5938324A/ja active Granted
- 1983-07-15 YU YU01533/83A patent/YU153383A/xx unknown
- 1983-07-18 ZA ZA835229A patent/ZA835229B/xx unknown
- 1983-07-30 IN IN951/CAL/83A patent/IN160848B/en unknown
- 1983-08-02 AT AT83107597T patent/ATE18921T1/de not_active IP Right Cessation
- 1983-08-02 EP EP83107597A patent/EP0103717B1/de not_active Expired
- 1983-08-02 DE DE8383107597T patent/DE3362793D1/de not_active Expired
- 1983-08-02 TR TR21551A patent/TR21551A/xx unknown
- 1983-08-03 IL IL69419A patent/IL69419A/xx unknown
- 1983-08-23 DK DK385283A patent/DK152224C/da not_active IP Right Cessation
- 1983-08-24 BR BR8304569A patent/BR8304569A/pt not_active IP Right Cessation
- 1983-08-24 ES ES525120A patent/ES525120A0/es active Granted

Also Published As

Publication number	Publication date
JPH0453925B2 (da)	1992-08-28
ES8405084A1 (es)	1984-05-16
ATE18921T1 (de)	1986-04-15
IL69419A0 (en)	1983-11-30
IN160848B (da)	1987-08-08
DE3362793D1 (en)	1986-05-07
IL69419A (en)	1987-01-30
EP0103717A1 (de)	1984-03-28
BR8304569A (pt)	1984-04-03
DK385283A (da)	1984-02-26
TR21551A (tr)	1984-09-27
YU153383A (en)	1985-12-31
DK385283D0 (da)	1983-08-23
DE3231540A1 (de)	1984-03-01
ZA835229B (en)	1984-03-28
DK152224C (da)	1988-06-27
DK152224B (da)	1988-02-08
JPS5938324A (ja)	1984-03-02
ES525120A0 (es)	1984-05-16

Legal Events

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1984-01-28	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
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