Austenitic alloy tube

Patent metadata

Field	Value
Publication number	US-9859026-B2
Application number	US-201314408483-A
Country	US
Kind code	B2
Filing date	Jun 19, 2013
Priority date	Jun 20, 2012
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

An austenitic alloy tube subjected to a cold working and an annealing heat treatment contains C: 0.01% to 0.15%, Cr: 10.0% to 40.0%, Ni: 8.0% to 80.0%, in mass %, and has a metallographic structure satisfying the following Expressions (i) to (iii).

R≦f 1  (i)

R=I 220 /I 111   (ii)

f 1=0.28×( F 111 8.0 /( F 111 8.0 +0.35 8.0 ))  (iii)
Where, in the above Expressions, R is a ratio of an integrated intensity of {220} to an integrated intensity of {111} on a surface layer which is measured by a grazing incidence X-ray diffraction method, I 220 is the integrated intensity of {220}, I 111 is the integrated intensity of {111}, and F 111 is full width of half maximum of {111} on the surface layer which is measured by the grazing incidence X-ray diffraction method.

First claim

The invention claimed is:

1. An austenitic alloy tube subjected to a cold working and an annealing heat treatment, comprising:
C: 0.01% to 0.15%;
Cr: 10.0% to 40.0%; and
Ni: 45% to 80.0%, in mass %,
wherein the austenitic alloy tube has a metallographic structure satisfying the following Expressions (i) to (iii),
R≦f 1  (i)

R=I 220 /I 111   (ii)

f 1=0.28×( F 111 8.0 /( F 111 8.0 +0.35 8.0 ))  (iii)

where, in the above Expressions, R is a ratio of an integrated intensity of {220} to an integrated intensity of {111} on a surface layer which is measured by a grazing incidence X-ray diffraction method, I 220 is the integrated intensity of {220}, I 111 is the integrated intensity of {111}, and F 111 is full width of half maximum of {111} on the surface layer which is measured by the grazing incidence X-ray diffraction method.

2. The austenitic alloy tube according to claim 1 ,
wherein the austenitic alloy tube is used as a nuclear power plant material.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• MOMOZONO Yumi
• Yonemura Mitsuharu
• Masaki Yasuhiro
• Kanzaki Manabu

Classifications

• C21D8/10

  during manufacturing of tubular bodies · CPC title

• C22C38/50

  with titanium or zirconium · CPC title

• C22C38/06

  containing aluminium · CPC title

• C22C30/00

  Alloys containing less than 50% by weight of each constituent · CPC title

• C22C19/058

  without Mo and W · CPC title