EP 0024106 A1 19810225 - Method of heat treating ferrous workpieces.
Title (en)
Method of heat treating ferrous workpieces.
Title (de)
Verfahren zur Wärmebehandlung von Werkstücken aus Eisen.
Title (fr)
Procédé de traitement thermique de métaux ferreux.
Publication
Application
Priority
- US 5585379 A 19790709
- US 9943979 A 19791203
Abstract (en)
A method of gas heat treating ferrous materials comprises mixing air in a predetermined proportion with a hydrocarbon gas (such as methane or propane) and slowly introducing the mixture to a treating chamber which is held at a temperature of 1500-2000 DEG F (816-1093 DEG C), so that the gas atmosphere is similar in composition to an independently generated endothermic gas-base atmosphere. The flow through the furnace chamber of the gas atmosphere is controlled to be low so that preferably the ratio of furnace chamber volume (cubic feet) to flow rate (cubic feet/hour) is always at least 0.2 hours. This carburizing process can also be run in a mode in which the atmosphere composition is automatically controlled. In carrying out the process, it is preferred that a constant flow of air be introduced into the furnace chamber and the hydrocarbon flow be regulated to maintain a constant value of furnace atmosphere CO2 content or oxygen potential.
IPC 1-7
IPC 8 full level
CPC (source: EP)
Citation (search report)
- US 4049473 A 19770920 - DAVIS II RAYMOND L, et al
- [A] US 3413161 A 19681126 - WERNER GOEHRING
- [A] US 4049472 A 19770920 - ARNDT EDWARD J
- [AP] GB 2016698 A 19790926 - IPSEN IND INT GMBH
- [A] DE 1918923 B1 19701112 - INDUGAS GES FUER IND GASVERWEN
- [AD] US 3519257 A 19700707 - WINTER KARL-HEINZ, et al
- [AD] US 3620518 A 19711116 - WINTER KARL-HEINZ, et al
- [A] METAL PROGRESS, Vol. 113, No. 4, April 1978, K.D. GLADDEN et al. "Furnace Atmosphere Control by the Oxigen Potential Method", pages 40 to 44.
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0024106 A1 19810225; EP 0024106 B1 19860102; DE 3071318 D1 19860213; ES 493253 A0 19810701; ES 8106559 A1 19810701
DOCDB simple family (application)
EP 80302236 A 19800702; DE 3071318 T 19800702; ES 493253 A 19800709