Patent · US Active

Process for coating a hot- or cold- rolled steel strip containing 6−30% by weight of MN with a metallic protective layer

US8394213B2 · kind B2 · utility

4Cited by

3References

15Claims

0Family size

Assignee

Thyssenkrupp Steel AG · DE

Inventors

Manfred Meurer · Rheinberg, DE
Ronny Leuschner · Dresden, DE
Harald Hofmann · Bergneustadt, DE

Key dates

Filing date	Aug 20, 2007
Grant date	Mar 12, 2013
Priority date	—
Expiry date	Aug 20, 2027

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC23C2/40
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A method for coating hot-rolled or cold-rolled steel strip containing 6-30 wt %. Mn with a metallic protective layer, includes annealing the steel strip at a temperature of 800-1100° C. under an annealing atmosphere containing nitrogen, water and hydrogen and then subjecting the steel strip to hot dip coating. The method provide an economical way of hot dip coating a high manganiferous sheet steel in that, in order to produce a metallic protective layer substantially free from oxidic sub-layers on the steel strip, the % H2O/% H2 ratio of the water content % H2O to the hydrogen content % H2 in the annealing atmosphere is adjusted as a function of the respective annealing temperature TG as follows: % H2O/% H2≦8·10−15·TG3.529.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.