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Title:
STEEL SHEET FOR CARBURIZATION, AND PRODUCTION METHOD FOR STEEL SHEET FOR CARBURIZATION
Document Type and Number:
WIPO Patent Application WO/2019/044970
Kind Code:
A1
Abstract:
Provided are a steel sheet for carburization that demonstrates even superior ultimate ductility prior to carburization, and a production method therefor. This steel sheet contains, in mass%, 0.02% to less than 0.30% C, 0.005% to less than 0.5% Si, 0.01% to less than 3.0% Mn, no more than 0.1% P, no more than 0.1% S, 0.0002% to 3.0% sol.Al, and no more than 0.2% N, with the remainder comprising Fe and impurities. The average value of the ratios of X-ray diffraction intensity in a random sample of the {100}<011> to {223}<110> orientation group of ferrite grains is no higher than 7.0. The average circle equivalent diameter of carbides is no larger than 5.0 μm. The proportion of the number of carbides with an aspect ratio of no higher than 2.0 is at least 80% relative to all of the carbides, and the proportion of the number of carbides present within the ferrite grains is at least 60% relative to all of the carbides.

Inventors:
TODA YURI (JP)
HIKIDA KAZUO (JP)
HASHIMOTO MOTONORI (JP)
Application Number:
PCT/JP2018/032111
Publication Date:
March 07, 2019
Filing Date:
August 30, 2018
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C21D1/06; C21D9/46; C22C38/14; C22C38/58; C22C38/60
Domestic Patent References:
WO2016190396A12016-12-01
WO2016190370A12016-12-01
WO2016148037A12016-09-22
WO2016190370A12016-12-01
WO2016148037A12016-09-22
Foreign References:
JP2015160986A2015-09-07
JP3094856B22000-10-03
Other References:
See also references of EP 3521477A4
FUMIO KUROSAWA ET AL., JOURNAL OF THE JAPAN INSTITUTE OF METALS AND MATERIALS (IN JAPANESE, vol. 43, 1979, pages 1068
Attorney, Agent or Firm:
KAMEYA, Yoshiaki et al. (JP)
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