Title:
TUBULAR BODY USED IN HIGH TEMPERATURE ATMOSPHERE AND METHOD FOR FORMING METAL OXIDE LAYER ON INNER SURFACE OF TUBULAR BODY
Document Type and Number:
WIPO Patent Application WO/2018/088070
Kind Code:
A1
Abstract:
The present invention provides: a tubular body used in high temperature atmospheres; and a method for stably forming a metal oxide layer to have a high surface area on the inner surface of the tubular body. This tubular body used in high temperature atmospheres is made of a heat resistant alloy, which contains 15% or more of Cr and 18% or more of Ni in mass%, and has the inner surface of which the arithmetic average roughness (Sa) of the three-dimensional surface roughness satisfies 1.5≤Sa≤5.0, and the skewness (Ssk) of the surface height distribution satisfies |Ssk|≤0.30. Said heat resistant alloy may contain 2.0% or more of Al in mass%. The kurtosis (Sku) of the surface height distribution of the three-dimensional surface roughness of the inner surface may satisfy Sku≥2.5.
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Inventors:
MATSUBARA MOTOYUKI (JP)
HASHIMOTO KUNIHIDE (JP)
YAMAGUCHI HIROSHI (JP)
TOMITA MASAYUKI (JP)
HASHIMOTO KUNIHIDE (JP)
YAMAGUCHI HIROSHI (JP)
TOMITA MASAYUKI (JP)
Application Number:
PCT/JP2017/036071
Publication Date:
May 17, 2018
Filing Date:
October 04, 2017
Export Citation:
Assignee:
KUBOTA KK (JP)
International Classes:
C23C8/14; B22D29/00; B23K35/30; C22C19/05; C22C38/00; C22C38/40; C22C38/60
Domestic Patent References:
WO2010113830A1 | 2010-10-07 |
Foreign References:
JP2013198917A | 2013-10-03 | |||
JP2014218728A | 2014-11-20 | |||
JP2011204723A | 2011-10-13 |
Other References:
See also references of EP 3540088A4
Attorney, Agent or Firm:
MARUYAMA & CO. (JP)
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