EP 0404496 A1 19901227 - Heat treatment of metals.
Title (en)
Heat treatment of metals.
Title (de)
Wärmebehandlung von Metallen.
Title (fr)
Traitement thermique des métaux.
Publication
Application
Priority
GB 8914366 A 19890622
Abstract (en)
A metal less readily oxidisable than iron is annealed in an atmosphere that is formed by separating (in for example a pressure swing adsorption apparatus 2) nitrogen from air to form a gas mixture comprising at least 95% by volume of nitrogen and a minor proportion of oxygen impurity, and then reacting the oxygen impurity with hydrogen in a catalytic reactor 4. The resulting atmosphere, which is admitted to an annealing furnace 6, comprises nitrogen, hydrogen and water vapour.
IPC 1-7
IPC 8 full level
C21D 1/76 (2006.01); C22F 1/00 (2006.01); C22F 1/02 (2006.01)
CPC (source: EP KR)
C21D 1/26 (2013.01 - KR); C21D 1/763 (2013.01 - EP); C22F 1/02 (2013.01 - EP)
Citation (search report)
- [A] US 3535074 A 19701020 - NAKASHIMA FUMITO
- [A] EP 0266745 A2 19880511 - AIR PROD & CHEM [US]
- [A] FR 2306936 A1 19761105 - AZOTE & PROD CHIM [FR]
- [A] US 4398971 A 19830816 - PETERSON RUNE [SE]
- [XP] FR 2639252 A1 19900525 - AIR LIQUIDE [FR]
- [XP] FR 2639250 A1 19900525 - AIR LIQUIDE [FR]
- [A] PATENT ABSTRACTS OF JAPAN, vol. 13, no. 156 (C-585)[3504], 14th April 1989; & JP-A-63 310 915 (DAIDO STEEL CO., LTD) 19-12-1988
- [A] ADVANCED MATERIALS & PROCESSES, vol. 134, no. 3, September 1988, pages 100,102,104,107, Metals Park, Ohio, US; W.C. QUANTZ: "Stealing nitrogen from the air"
Designated contracting state (EPC)
BE DE ES FR GB IT NL SE
DOCDB simple family (publication)
EP 0404496 A1 19901227; AU 5759290 A 19910103; AU 621230 B2 19920305; CA 2019565 A1 19901222; GB 8914366 D0 19890809; JP H03166343 A 19910718; KR 910001073 A 19910130; ZA 904677 B 19910828
DOCDB simple family (application)
EP 90306645 A 19900619; AU 5759290 A 19900618; CA 2019565 A 19900621; GB 8914366 A 19890622; JP 16549390 A 19900622; KR 900009118 A 19900621; ZA 904677 A 19900615