Method for hot-dip coating of a steel flat product

US9803270B2 · kind B2 · utility

Assignees

• ThyssenKrupp Steel Europe AG · DE
• Outokumpu Nirosta GmbH · DE

Inventors

• Marc Blumenau · Hagen, DE
• Christopher Gusek · Iserlohn, DE
• Fred Jindra · Lennestadt, DE
• Rudolf Schoenenberg · Daphne, US
• Hans-Joachim Krautschick · Solingen, DE

Key dates

• Filing date: Dec 13, 2012
• Grant date: Oct 31, 2017
• Expiry date: May 3, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C2/40
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method which allows process-stable hot-dip coating of Ni-alloy steel flat products in a cost- and resource-effective manner, including the following steps: a) provision of a steel flat product obtained by cold- or hot-rolling; b) within 1-30 s, heating the steel flat product to a holding temperature between 700 and 1100° C., under a heating atmosphere of N2; c) holding the steel flat product at the holding temperature for a holding duration of 10-120 s under a holding atmosphere of N2; d) cooling the steel flat product from the holding temperature to a strip inlet temperature of 430-800° C.; and e) passing the steel flat product through an inlet zone, in which an inert or reducing inlet atmosphere predominates, and passing the steel flat product through a melt bath, wherein TP1>TP2>TP4.