HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND PRODUCTION METHOD THEREOF

Title:

HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND PRODUCTION METHOD THEREOF

Document Type and Number:

WIPO Patent Application WO/2016/113789

Kind Code:

A1

Abstract:

This high-strength hot-dip galvanized steel sheet has a component composition comprising, in mass%, C: 0.15%-0.25%, Si: 0.50%-2.5%, Mn 2.3%-4.0%, P: 0.100% or less, S: 0.02% or less, and Al: 0.01%-2.5%, the remainder being Fe and unavoidable impurities, and has a steel sheet structure comprising, by area ratio, a tempered martensite phase: 30%-73%, a ferrite phase: 25%-68%, a residual austenite phase: 2%-20%, and other phases: 10% or less (including 0%), said other phases including a martensite phase: 3% or less (including 0%) and a bainitic ferrite phase: less than 5% (including 0%), wherein the average crystal grain diameter of the aforementioned tempered martensite phase is 8μm or less, and the amount of C in the aforementioned residual austenite phase is less than 0.7 mass%. A production method of this high-strength hot-dip galvanized steel sheet is also provided.

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Inventors:

HASEGAWA HIROSHI (JP)
KIMURA HIDEYUKI (JP)
FUNAKAWA YOSHIMASA (JP)
MAKIMIZU YOICHI (JP)
SUZUKI YOSHITSUGU (JP)

Application Number:

PCT/JP2015/005821

Publication Date:

July 21, 2016

Filing Date:

November 24, 2015

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C22C38/00; C21D9/46; C22C38/06; C22C38/58; C23C2/02; C23C2/06; C23C2/28; C23C2/40

Foreign References:

JP2009203548A	2009-09-10
JP2010275627A	2010-12-09
JP2003013177A	2003-01-15
JP2010196115A	2010-09-09

Other References: