METHOD FOR PRODUCING HIGH-STRENGTH HOT DIPPED GALVANIZED STEEL SHEET

Title:

METHOD FOR PRODUCING HIGH-STRENGTH HOT DIPPED GALVANIZED STEEL SHEET

Document Type and Number:

WIPO Patent Application WO/2021/166350

Kind Code:

A1

Abstract:

The present invention enables the achievement of a high-strength hot dipped galvanized steel sheet which has excellent plating appearance even in cases where a steel strip that contains Mn in a predetermined amount or more relative to Si is subjected to hot dip galvanization. A method for producing a hot dipped galvanized steel sheet, said method using a continuous hot dip galvanization apparatus, while comprising a step wherein a steel strip is annealed by being conveyed within an annealing furnace and a step wherein a hot dipped galvanized steel sheet is obtained by subjecting the steel strip, which has been discharged from the cooling zone, to hot dip galvanization with use of a hot dip galvanization facility. The steel strip has a component composition that contains, in mass%, from 1.7% to 3.5% of Mn and from 0.2% to 1.05% of Si, while satisfying (Si)/(Mn) ≤ 0.30; and the component composition, the dew point of the atmosphere within the soaking zone, and the outlet side temperature of the heating zone satisfy formula (1).

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Inventors:

YAMAMOTO SHUNSUKE (JP)
TERASHIMA SHOTARO (JP)
TAKEDA YUKI (JP)
SAKURAI MICHITAKA (JP)
HOSHINO KATSUYA (JP)
KAWASAKI YOSHIYASU (JP)

Application Number:

PCT/JP2020/043279

Publication Date:

August 26, 2021

Filing Date:

November 19, 2020

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C21D9/56; C22C38/00; C22C38/04; C22C38/60; C23C2/02; C23C2/06; C23C2/28; C23C2/40

Domestic Patent References:

WO2018079124A1	2018-05-03
WO2007043273A1	2007-04-19

Foreign References:

JP2016084543A	2016-05-19
JP2008266778A	2008-11-06
US20140144550A1	2014-05-29
JP2016053211A	2016-04-14

Other References: