EP 2732062 A2 20140521 - METHOD FOR PRODUCING A FLAT STEEL PRODUCT WHICH IS PROVIDED WITH A METALLIC PROTECTIVE LAYER BY MEANS OF HOT DIP COATING
Title (en)
METHOD FOR PRODUCING A FLAT STEEL PRODUCT WHICH IS PROVIDED WITH A METALLIC PROTECTIVE LAYER BY MEANS OF HOT DIP COATING
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES DURCH SCHMELZTAUCHBESCHICHTEN MIT EINER METALLISCHEN SCHUTZSCHICHT VERSEHENEN STAHLFLACHPRODUKTS
Title (fr)
PROCÉDÉ DE FABRICATION D'UN PRODUIT PLAT EN ACIER MUNI PAR IMMERSION À CHAUD D'UNE COUCHE DE PROTECTION MÉTALLIQUE
Publication
Application
Priority
- DE 102011051731 A 20110711
- EP 2012063069 W 20120705
Abstract (en)
[origin: CA2839183A1] For a hot-dip coated, flat steel product, optimal wetting and adhesion of the hot dip coating are achieved by preoxidation in a DFF preheating furnace and humidification of the annealing atmosphere in a holding zone. First, the flat steel product, which is present at a temperature of 550 - 850 °C, is exposed to an oxidising atmosphere, which is introduced by injecting an oxygen-containing gas stream into the flame of a burner, for 1 - 15 s in a preoxidation section of the DFF furnace in order to form a covering FeO layer on the surface thereof, whereas a reduced or neutral atmosphere with respect to the steel surface prevails outside the preoxidation section in the DFF furnace. The flat steel product, which has been heated to a holding temperature of 600 - 1100 °C, is then annealed in a recrystallising manner under an FeO-reducing atmosphere, the dew point of which is held at -40 °C to +25 °C by the addition of moisture, cooled to a bath entry temperature of 420 - 780 °C under an atmosphere having =100 % N2 and a dew point of -80 °C bis -25 °C, and passed through a melt bath.
IPC 8 full level
C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/18 (2006.01); C22C 38/22 (2006.01); C22C 38/38 (2006.01); C23C 2/02 (2006.01)
CPC (source: EP KR US)
C21D 1/74 (2013.01 - EP KR US); C21D 6/005 (2013.01 - EP KR US); C21D 8/0226 (2013.01 - KR); C21D 8/0236 (2013.01 - KR); C21D 8/0263 (2013.01 - KR US); C21D 8/0278 (2013.01 - EP KR US); C21D 9/46 (2013.01 - KR); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/06 (2013.01 - EP KR US); C22C 38/18 (2013.01 - EP KR US); C22C 38/22 (2013.01 - EP KR US); C22C 38/38 (2013.01 - EP KR US); C23C 2/0222 (2022.08 - EP US); C23C 2/0224 (2022.08 - EP KR US); C23C 2/024 (2022.08 - EP US); C23C 8/10 (2013.01 - KR US); C21D 8/0226 (2013.01 - EP US); C21D 8/0236 (2013.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
DE 102011051731 A1 20130117; DE 102011051731 B4 20130124; CA 2839183 A1 20130117; CA 2839183 C 20181211; EP 2732062 A2 20140521; EP 2732062 B1 20160629; ES 2593490 T3 20161209; JP 2014525986 A 20141002; JP 5753319 B2 20150722; KR 101940250 B1 20190118; KR 20140059777 A 20140516; RU 2014104593 A 20150820; RU 2573843 C2 20160127; US 2014251505 A1 20140911; US 9096919 B2 20150804; WO 2013007578 A2 20130117; WO 2013007578 A3 20130502
DOCDB simple family (application)
DE 102011051731 A 20110711; CA 2839183 A 20120705; EP 12735114 A 20120705; EP 2012063069 W 20120705; ES 12735114 T 20120705; JP 2014519501 A 20120705; KR 20147003471 A 20120705; RU 2014104593 A 20120705; US 201214232089 A 20120705