EP 0075438 B1 19871216 - HEAT TREATMENT OF METALS
Title (en)
HEAT TREATMENT OF METALS
Publication
Application
Priority
- GB 8128392 A 19810919
- GB 8217338 A 19820615
Abstract (en)
[origin: EP0075438A1] Workpieces to be heat treated (for example to be annealed or sintered) are passed through a continuous furnace having in sequence, an entrance, a thermal treatment region, a cooling region and an exit. Ingress of air into the furnace through the entrance and exit is prevented. Typically the cooling region is provided at its exit end with one or more curtains or partitions providing a physical obstruction to the flow of air into the furnace and a flow of non-reactive gas (eg nitrogen) also to inhibit ingress of air. The curtains or partitions may form one or more chambers with the furnace and the nitrogen supplied to such chamber or chambers, Non-reactive gas and reducing gas (eg hydrogen) are introduced into the furnace to provide substantially non-oxidising conditions therein. The flow regimen is such that atmosphere or different compositions are created in the thermal treatment and cooling regions, By severely limiting ingress of air into the furnace and creating eg differential hydrogen concentrations along the furnace overall consumptions of gas may be considerably reduced.
IPC 1-7
IPC 8 full level
C21D 1/74 (2006.01); C21D 9/56 (2006.01); F27D 23/00 (2006.01); F27D 99/00 (2010.01); F27B 9/24 (2006.01); F27D 1/18 (2006.01)
CPC (source: EP)
C21D 1/74 (2013.01); C21D 9/561 (2013.01); F27D 99/0073 (2013.01); F27B 9/243 (2013.01); F27D 2001/1883 (2013.01)
Designated contracting state (EPC)
BE DE FR NL SE
DOCDB simple family (publication)
EP 0075438 A1 19830330; EP 0075438 B1 19871216; AU 556896 B2 19861127; AU 8850882 A 19830331; DE 3277843 D1 19880128; ES 515780 A0 19840301; ES 526964 A0 19840916; ES 8403163 A1 19840301; ES 8407573 A1 19840916; GB 2108156 A 19830511; GB 2108156 B 19860115; JP H01127618 A 19890519; JP H0617501 B2 19940309
DOCDB simple family (application)
EP 82304867 A 19820915; AU 8850882 A 19820917; DE 3277843 T 19820915; ES 515780 A 19820917; ES 526964 A 19831102; GB 8226302 A 19820915; JP 17362488 A 19880712