Title:
GALVANIZED STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2020/203943
Kind Code:
A1
Abstract:
Provided are a galvanized steel sheet and a method for producing same, the galvanized steel sheet comprising: a steel sheet having a predetermined chemical composition; and a galvanized layer disposed on the steel sheet, wherein the metallographic structure of the steel sheet is composed of 70% or more in total of tempered martensite and bainite, 8% or more of retained austenite, 0-10% of fresh martensite, and 0-10% of ferrite in volume fraction, ΔHv, which is the difference between the maximum value and the minimum value of the Vickers hardness in a cross section perpendicular to the rolling direction of the steel sheet, is Hv 50 or less, the galvanized layer contains a predetermined amount of Fe and Ni, and the tensile strength is at least 980 MPa.
Inventors:
OKA MASAHARU (JP)
KOJIMA NOBUSATO (JP)
YOSHIDA MITSURU (JP)
KOJIMA NOBUSATO (JP)
YOSHIDA MITSURU (JP)
Application Number:
PCT/JP2020/014434
Publication Date:
October 08, 2020
Filing Date:
March 30, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C21D9/46; C22C18/00; C22C38/14; C22C38/58; C23C2/02; C23C2/06; C23C2/26; C23C2/40
Domestic Patent References:
| WO2016010004A1 | 2016-01-21 |
Foreign References:
| JP2019508572A | 2019-03-28 | |||
| JP2010180446A | 2010-08-19 | |||
| JP2015124411A | 2015-07-06 | |||
| JP2018003062A | 2018-01-11 | |||
| JPH04333551A | 1992-11-20 | |||
| JPH04333552A | 1992-11-20 |
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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