Europaisches Patentamt European Patent Office Office europeen des brevets © Publication number: 0 027 649 A1 © EUROPEAN PATENT APPLICATION © Application number: 80106339.7 © Date of filing: 17.10.80 ©Int. CI.*: C 21 D 1/76 C 21 D 1/26, C 21 D 1/32 © Priority: 23.10.79 US 87360 © Applicant: AIR PRODUCTS AND CHEMICALS, INC. P.O. Box 538 Allentown, Pennsylvania 18105(US) © Date of publication of application: 29.04.81 Bulletin 81/17 © Inventor: Levis, Robert Walter Rua Doutor Martinico Prado 481 Apto 1302 © Designated Contracting States: Higienopolis - Cop 01224 Sao Paulo(BR) BE DE FR GB IT NL © Representative: Berg, Wilhelm, Dr. et al. Dr. Berg, Dipl.-lng. Stapf, Dipl.-lng. Schwabe, Dr. Dr. Sandmair Mauerkircherstrasse 45 D-8000 Munchen 80(DE) © Protective atmosphere process for annealing and or spheroidizing ferrous metals. Methanol and nitrogen are injected into a furnace utilized for annealing or spheroidizing metal articles. The methanol reacts inside the furnace to provide an atmosphere with a carbon potential that will minimize or prevent carbon removal or carbon addition to the surface of the ferrous metals being treated.
Protective atmosphere process for annealing and or spheroidizing ferrous metals
Jun 23, 2023
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