Title:
STEEL SHEET FOR COAL/ORE CARRIER HOLD
Document Type and Number:
WIPO Patent Application WO/2019/176112
Kind Code:
A1
Abstract:
A steel sheet for coal/ore carrier holds that is a ferrite-pearlite steel sheet of specified components, wherein: the microstructure is a structure configured with the ferrite area fraction in the ¼ thickness region being 80-95% and the pearlite area fraction at the ¼ thickness region being 5-20%, the average aspect ratio of the ferrite grains in the ¼ thickness region being 1.0-1.5, the average grain size of the ferrite grains in the ¼ thickness region being 5-20 µm, and the average dislocation density in the ferrite in the ¼ thickness region being 7×1012/m2 or less; in a 1 mm pitch Vickers hardness test, the average Vickers hardness from the steel sheet surface to the ¼ thickness region or from the ¾ thickness region to the back surface is 80-105% of the average Vickers hardness from the ¼ thickness region to the ¾ thickness region; and the maximum Sn concentration in the ½ thickness (sheet thickness) ± 10% range in the sheet thickness direction is 0.01-5.0%.
Inventors:
ICHIKAWA KAZUTOSHI (JP)
KASHIMA KAZUYUKI (JP)
KANEKO MICHIO (JP)
YANAGITA KAZUHISA (JP)
OKAWA TEPPEI (JP)
KASHIMA KAZUYUKI (JP)
KANEKO MICHIO (JP)
YANAGITA KAZUHISA (JP)
OKAWA TEPPEI (JP)
Application Number:
PCT/JP2018/010616
Publication Date:
September 19, 2019
Filing Date:
March 16, 2018
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; B21B1/38; B22D11/128; C21C7/04; C21C7/06; C21C7/10; C21D8/02; C22C38/58
Foreign References:
| JP2014001450A | 2014-01-09 | |||
| JP2012246520A | 2012-12-13 | |||
| JP2013253275A | 2013-12-19 | |||
| JP6264519B1 | 2018-01-24 |
Attorney, Agent or Firm:
KINOSHITA & ASSOCIATES (JP)
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