EP 2010690 B1 20100224 - HOT DIP COATING PROCESS FOR A STEEL PLATE PRODUCT MADE OF HIGH STRENGTHHEAVY-DUTY STEEL
Title (en)
HOT DIP COATING PROCESS FOR A STEEL PLATE PRODUCT MADE OF HIGH STRENGTHHEAVY-DUTY STEEL
Title (de)
VERFAHREN ZUM SCHMELZTAUCHBESCHICHTEN EINES STAHLFLACHPRODUKTES AUS HÖHERFESTEM STAHL
Title (fr)
PROCÉDÉ DE REVÊTEMENT PAR IMMERSION EN FUSION D'UN PRODUIT PLAT EN ACIER HYPERRÉSISTANT
Publication
Application
Priority
EP 2006061858 W 20060426
Abstract (en)
[origin: WO2007124781A1] The invention relates to a process for coating manufactured highheavy-strength duty steel plate products containing steel made of various alloying constituentscomponents, especially Mn, Al, Si and/or Cr, with a protective metal layer, whereby the steel plate product is first treated with heat and then coated in a smelting bath of at least 85% zinc and/or aluminum with the protective metal layer while in at its warmed elevated up statetemperature. As per the invention, the heat treatment includes the following processing steps: a) the steel plate product is heated to a temperature of > 750 °C to 850 °C up in a reduced atmosphere with an H2 content of at least 2% to 8% to a temperature of > 750 °C to 850 °C. b) The steel plate product is treated with heat for 1 to 10 seconds, whereby the surface, primarily made of pure iron, is converted into an iron oxide coating at a temperature of > 750°C to 850°C in a reaction chamber integrated into a continuous furnace with an oxidizing atmosphere that has an O<SUB>2</SUB>-content of 0.01 % to 1 %. Cc) The steel plate product is then annealed in a reduced atmosphere with an H<SUB>2</SUB>-content of 2 % to 8 % by heating it up to a maximum of 900 °C over a period of time that is longer than the duration of the thermal treatment needed to generate the iron oxide coating (process step b) thus reducing the pure iron in the surface of the previously generated iron oxide layer. Dd) The steel plate product is then cooled to smelting bath temperature.
IPC 8 full level
C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 2/12 (2006.01)
CPC (source: EP KR US)
C23C 2/0038 (2022.08 - EP US); C23C 2/004 (2022.08 - EP KR US); C23C 2/02 (2013.01 - EP); C23C 2/0222 (2022.08 - EP KR US); C23C 2/0224 (2022.08 - EP KR US); C23C 2/024 (2022.08 - EP KR US); C23C 2/06 (2013.01 - EP KR US); C23C 2/12 (2013.01 - EP KR US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2007124781 A1 20071108; AT E458838 T1 20100315; BR PI0621610 A2 20111213; CA 2647687 A1 20071108; CA 2647687 C 20121002; CN 101501235 A 20090805; CN 101501235 B 20120704; DE 502006006289 D1 20100408; EP 2010690 A1 20090107; EP 2010690 B1 20100224; ES 2339804 T3 20100525; JP 2009534537 A 20090924; JP 5189587 B2 20130424; KR 101275839 B1 20130618; KR 20080111492 A 20081223; PL 2010690 T3 20100730; US 2009199931 A1 20090813; US 8636854 B2 20140128
DOCDB simple family (application)
EP 2006061858 W 20060426; AT 06754869 T 20060426; BR PI0621610 A 20060426; CA 2647687 A 20060426; CN 200680054367 A 20060426; DE 502006006289 T 20060426; EP 06754869 A 20060426; ES 06754869 T 20060426; JP 2009506924 A 20060426; KR 20087025650 A 20060426; PL 06754869 T 20060426; US 29711206 A 20060426