EP 3749793 A1 20201216 - METHOD FOR PRODUCING A STEEL STRIP WITH IMPROVED BONDING OF METALLIC HOT-DIP COATINGS
Title (en)
METHOD FOR PRODUCING A STEEL STRIP WITH IMPROVED BONDING OF METALLIC HOT-DIP COATINGS
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES STAHLBANDES MIT VERBESSERTER HAFTUNG METALLISCHER SCHMELZTAUCHÜBERZÜGE
Title (fr)
PROCÉDÉ DE FABRICATION D'UNE BANDE D'ACIER À ADHÉRENCE AMÉLIORÉE DE DÉPÔTS MÉTALLIQUES PAR IMMERSION À CHAUD
Publication
Application
Priority
- DE 102018102624 A 20180206
- EP 2019052191 W 20190130
Abstract (en)
[origin: WO2019154680A1] The invention relates to a method for producing a steel strip, which contains along with iron as the main constituent and unavoidable impurities one or more of the oxygen-affine elements in % by weight: Al: more than 0.02, Cr: more than 0.1, Mn: more than 1.3 or Si: more than 0.1, wherein the surface of the steel strip is cleaned, the steel strip is annealed and the steel strip thus treated and annealed is subsequently coated with a hot-dip coating. In order to be less cost-intensive and achieve uniform, reproducible bonding conditions for the coating, it is proposed that, before the annealing, the steel strip is oxygen-treated at temperatures below 200°C, wherein, by the formation of oxides with iron, an oxide film containing iron oxide is formed on the surface of the steel strip and in the course of the annealing is reductively treated under a reducing atmosphere to achieve a surface that substantially consists of metallic iron.
IPC 8 full level
C23C 2/06 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C25D 11/02 (2006.01)
CPC (source: EP KR RU US)
C21D 1/673 (2013.01 - EP KR); C21D 1/76 (2013.01 - KR); C21D 9/46 (2013.01 - KR RU); C21D 9/561 (2013.01 - EP KR US); C21D 9/5732 (2013.01 - KR US); C21D 9/5735 (2013.01 - KR US); C22C 38/00 (2013.01 - RU); C22C 38/02 (2013.01 - US); C22C 38/06 (2013.01 - US); C22C 38/38 (2013.01 - US); C23C 2/0038 (2022.08 - EP KR RU US); C23C 2/02 (2013.01 - EP RU US); C23C 2/0222 (2022.08 - EP KR RU US); C23C 2/0224 (2022.08 - EP KR RU US); C23C 2/024 (2022.08 - EP RU US); C23C 2/026 (2022.08 - EP KR RU US); C23C 2/06 (2013.01 - EP KR RU US); C23C 2/12 (2013.01 - EP KR RU); C23C 2/40 (2013.01 - EP KR RU US); C23C 8/10 (2013.01 - KR US); C25D 11/34 (2013.01 - EP KR RU); C21D 1/74 (2013.01 - EP); C21D 1/76 (2013.01 - EP); C21D 9/46 (2013.01 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE 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
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DE 102018102624 A1 20190808; EP 3749793 A1 20201216; EP 3749793 B1 20230712; KR 102635881 B1 20240208; KR 20200118079 A 20201014; RU 2766611 C1 20220315; US 11702729 B2 20230718; US 2021156018 A1 20210527; WO 2019154680 A1 20190815
DOCDB simple family (application)
DE 102018102624 A 20180206; EP 19703657 A 20190130; EP 2019052191 W 20190130; KR 20207024727 A 20190130; RU 2020124908 A 20190130; US 201916967619 A 20190130