IT1244783B - THERMAL TREATMENT PROCESS OF METALLIC OBJECTS UNDER PROTECTIVE ATMOSPHERE - Google Patents
THERMAL TREATMENT PROCESS OF METALLIC OBJECTS UNDER PROTECTIVE ATMOSPHEREInfo
- Publication number
- IT1244783B IT1244783B ITMI910683A ITMI910683A IT1244783B IT 1244783 B IT1244783 B IT 1244783B IT MI910683 A ITMI910683 A IT MI910683A IT MI910683 A ITMI910683 A IT MI910683A IT 1244783 B IT1244783 B IT 1244783B
- Authority
- IT
- Italy
- Prior art keywords
- nitrogen
- atmosphere
- helium
- thermal treatment
- metallic objects
- Prior art date
Links
- 230000001681 protective effect Effects 0.000 title abstract 2
- 238000007669 thermal treatment Methods 0.000 title abstract 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract 8
- 229910052757 nitrogen Inorganic materials 0.000 abstract 4
- 239000007789 gas Substances 0.000 abstract 3
- 239000001307 helium Substances 0.000 abstract 3
- 229910052734 helium Inorganic materials 0.000 abstract 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical group [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 abstract 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 2
- 239000001257 hydrogen Substances 0.000 abstract 2
- 229910052739 hydrogen Inorganic materials 0.000 abstract 2
- 238000001816 cooling Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B11/00—Bell-type furnaces
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/663—Bell-type furnaces
- C21D9/667—Multi-station furnaces
- C21D9/67—Multi-station furnaces adapted for treating the charge in vacuum or special atmosphere
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Procedimento di trattamento termico di oggetti metallici sotto atmosfera di protezione in forno che funziona in modo discontinuo, del tipo in cui, in una fase iniziale di aumento di temperatura, si assicura l'introduzione di una portata di gas di lavaggio contenente sostanzialmente azoto, mentre la fase di raffreddamento viene effettuata sotto una atmosfera contenente prevalentemente un gas dotato di una migliore conducibilità termica rispetto all'azoto, caratterizzato dal fatto che si provoca una sostituzione dell'atmosfera a base di azoto con una atmosfera a base di elio e ciò a partire dal momento in cui l'aumento di temperatura è stato sostanzialmente effettuato.Il gas contenente sostanzialmente elio è una miscela di elio e di idrogeno con un contenuto di idrogeno inferiore al 10%.Applicazione ai forni a campana classici nei quali si impiega azoto, con la condizione di un semplice miglioramento delle guarnizioni di tenuta.Method of thermal treatment of metallic objects under a protective atmosphere in an oven that operates in a discontinuous way, of the type in which, in an initial phase of temperature increase, the introduction of a flow of washing gas containing substantially nitrogen is ensured, while the cooling phase is carried out under an atmosphere mainly containing a gas with a better thermal conductivity than nitrogen, characterized by the fact that the nitrogen-based atmosphere is replaced with a helium-based atmosphere and this starting from the moment when the temperature increase was substantially carried out. The gas containing substantially helium is a mixture of helium and hydrogen with a hydrogen content of less than 10%. Application to classic bell furnaces in which nitrogen is used, with the condition of a simple improvement of the seals.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9004306A FR2660744B1 (en) | 1990-04-04 | 1990-04-04 | BELL OVEN. |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| ITMI910683A0 ITMI910683A0 (en) | 1991-03-14 |
| ITMI910683A1 ITMI910683A1 (en) | 1992-09-14 |
| IT1244783B true IT1244783B (en) | 1994-08-08 |
Family
ID=9395438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ITMI910683A IT1244783B (en) | 1990-04-04 | 1991-03-14 | THERMAL TREATMENT PROCESS OF METALLIC OBJECTS UNDER PROTECTIVE ATMOSPHERE |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPH05263126A (en) |
| BE (1) | BE1006163A4 (en) |
| CA (1) | CA2039385A1 (en) |
| ES (1) | ES2026823A6 (en) |
| FR (1) | FR2660744B1 (en) |
| IT (1) | IT1244783B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4129879A1 (en) * | 1991-09-09 | 1993-03-11 | Loi Ind Ofenanlagen | METHOD FOR REPLACING THE ATMOSPHERES OF AN INDUSTRIAL STOVE |
| DE102004058464A1 (en) * | 2004-12-03 | 2006-06-22 | Linde Ag | Process for gas quenching |
| EP2304061A1 (en) | 2008-06-13 | 2011-04-06 | LOI Thermprocess GmbH | Process for the high-temperature annealing of grain-oriented magnetic steel strip in an inert gas atmosphere in a heat treatment furnace |
| CN101812584B (en) * | 2010-05-06 | 2012-03-21 | 山西太钢不锈钢股份有限公司 | Method for blowing hydrogen in cover annealing |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2450081A (en) * | 1945-04-05 | 1948-09-28 | George R Burkhardt | Noble gas metallurgy |
| GB1233847A (en) * | 1968-06-28 | 1971-06-03 | ||
| AT395321B (en) * | 1983-07-05 | 1992-11-25 | Ebner Ind Ofenbau | METHOD FOR COOLING CHARGES IN DISCONTINUOUSLY WORKING INDUSTRIAL OVENS, ESPECIALLY STEEL WIRE OR TAPE BANDS IN DOME GLUES |
| DE3736501C1 (en) * | 1987-10-28 | 1988-06-09 | Degussa | Process for the heat treatment of metallic workpieces |
-
1990
- 1990-04-04 FR FR9004306A patent/FR2660744B1/en not_active Expired - Fee Related
-
1991
- 1991-03-14 IT ITMI910683A patent/IT1244783B/en active IP Right Grant
- 1991-03-22 JP JP3058783A patent/JPH05263126A/en active Pending
- 1991-03-25 ES ES9100765A patent/ES2026823A6/en not_active Expired - Lifetime
- 1991-03-28 CA CA002039385A patent/CA2039385A1/en not_active Abandoned
- 1991-04-02 BE BE9100299A patent/BE1006163A4/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ITMI910683A0 (en) | 1991-03-14 |
| JPH05263126A (en) | 1993-10-12 |
| FR2660744A1 (en) | 1991-10-11 |
| ITMI910683A1 (en) | 1992-09-14 |
| CA2039385A1 (en) | 1991-10-05 |
| ES2026823A6 (en) | 1992-05-01 |
| FR2660744B1 (en) | 1994-03-11 |
| BE1006163A4 (en) | 1994-05-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 0001 | Granted | ||
| TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19970228 |