AUSTENITIC ALLOY MATERIAL AND AUSTENITIC ALLOY PIPE - NIPPON STEEL & SUMITOMO METAL CORP

Title:

AUSTENITIC ALLOY MATERIAL AND AUSTENITIC ALLOY PIPE

Document Type and Number:

WIPO Patent Application WO/2018/003887

Kind Code:

A1

Abstract:

An austenitic alloy material which is provided, in at least a part of the surface of a base material, with a coating film that has a thickness of 0.1-50 μm and contains chromium oxide. The coating film has a chemical composition that contains, in atom%, 50% or more of Cr in terms of a proportion in the components excluding O, C and N at a depth where the Cr concentration is highest. The chemical composition of the base material contains, in mass%, 0.001-0.6% of C, 0.01-5.0% of Si, 0.1-10.0% of Mn, 0.08% or less of P, 0.05% of less of S, 15.0-55.0% of Cr, 30.0-80.0% of Ni, 0.001-0.25% of N, 0.02% or less of O, 0-20.0% of Mo, 0-5.0% of Cu, 0-5.0% of Co, 0-10.0% of W, 0-6.0% of Ta, 0-5.0% of Nb, 0-1.0% of Ti, 0-0.1% of B, 0-0.1% of Zr, 0-0.1% of Hf, 0-1.0% of Al, 0-0.1% of Mg and 0-0.1% of Ca, with the balance made up of Fe and impurities.

Inventors:

MASAKI YASUHIRO (JP)
TAKEDA KIYOKO (JP)
OSUKI TAKAHIRO (JP)

Application Number:

PCT/JP2017/023824

Publication Date:

January 04, 2018

Filing Date:

June 28, 2017

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

C23C8/18; B01J23/26; B01J23/28; B01J23/652; B01J23/86; C22C19/05; C22C30/02; C23C18/12; C23C18/38; C23C28/00; C23C28/04

Foreign References:

JP2003239060A	2003-08-27
JP2007262558A	2007-10-11

Other References: