Production method for plated steel sheet using a steel sheet annealing device

Patent metadata

Field	Value
Publication number	US-10053749-B2
Application number	US-201514971258-A
Country	US
Kind code	B2
Filing date	Dec 16, 2015
Priority date	Dec 26, 2008
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

Provided is a method for producing plated steel sheet by means of an annealing device which includes at least one section and in which the at least one section is filled with a gas constituting a non-reducing atmosphere or a weakly reducing atmosphere to substantially improve the quality of plating onto hot-dipped steel sheet, including the plating properties, alloying properties, anti-pickup properties, plating adhesion properties, anti-flaking properties, anti-cratering properties and anti-ash properties, by using prior-art annealing equipment and heat-treatment cycle without any additional oxidation-reduction heat treatment process or large quantities of high-cost alloying elements.

First claim

The invention claimed is:

1. A plated steel sheet manufacturing method including:
an annealing process for annealing a steel sheet by supplying a non-reducing atmospheric gas from the start of the annealing process to the end of the annealing process, and
a plating process for plating the annealed steel sheet,
wherein the non-reducing atmospheric gas contains nitrogen (N 2 ) of 100 vol % and has a dew-point temperature of −30° C. to −10° C.

2. The method of claim 1 , wherein the annealing process includes at least one operation selected from the group consisting of pre heating, heating, soaking, slow cooling, rapid cooling, and final cooling.

3. The method of claim 2 , wherein the annealing process further includes at least one of overaging and re-heating operations.

4. The method of claim 1 , wherein the plated steel sheet is one of a hot-dip galvanized steel sheet, a galvannealed steel sheet, a galvanium plated steel sheet, an aluminum plated steel sheet and a zinc-magnesium-based plated steel sheet.

Assignees

• Posco

Inventors

• Park Rho-Bum
• Chin Kwang-Geun
• Park Man-Young

Classifications

• C22C38/60

  containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur · CPC title

• C23C2/12

  Aluminium or alloys based thereon · CPC title

• C21D8/02

  during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title

• C21D6/008

  containing Si · CPC title

• C21D1/26

  Methods of annealing · CPC title