Title:
STEEL MATERIAL AND METHOD FOR PRODUCING SAME, AND TANK AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2022/168686
Kind Code:
A1
Abstract:
Provided are a steel material and a method for producing the same, and a tank and a method for producing the same. A steel material according to the present invention contains, in terms of mass%, 0.200%-0.700% C, 0.05%-1.00% Si, 20.0%-40.0% Mn, 0.030% or less P, 0.0050% or less S, 5.00% or less Al, 7.0% or less Cr, 0.0500% or less N, 0.0050% or less O, less than 0.005% Ti, and less than 0.005% Nb, and contains at least one selected from 0.0100% or less Ca, 0.0100% or less Mg, and 0.0200% or less REM, with the remainder having a component composition comprising iron and unavoidable impurities. The microstructure of the steel material is such that the maximum crystal grain size at a position 1 mm below the surface of the steel material is less than 200 μm.
Inventors:
IZUMI DAICHI (JP)
ISHIDA TOSHINORI (JP)
UEDA KEIJI (JP)
ISHIDA TOSHINORI (JP)
UEDA KEIJI (JP)
Application Number:
PCT/JP2022/002735
Publication Date:
August 11, 2022
Filing Date:
January 25, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; B21D51/18; C21D8/02; C22C38/38; C22C38/58; F17C3/00
Domestic Patent References:
| WO2019044928A1 | 2019-03-07 | |||
| WO2018105510A1 | 2018-06-14 | |||
| WO2018199145A1 | 2018-11-01 |
Foreign References:
| JP2017155300A | 2017-09-07 | |||
| JP2020537714A | 2020-12-24 | |||
| JPH03161120A | 1991-07-11 | |||
| JP2016196703A | 2016-11-24 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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