IP Library › Granted Patent US 9,612,008
Granted Patent B2
US 9,612,008 · App. 14/129,335 · Granted Apr 4, 2017

Austenitic stainless steel tube

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Quick Facts
Patent No.
US 9,612,008
App. No.
14/129,335
Granted
Apr 4, 2017
Kind
B2
Abstract

There is provided an austenitic stainless steel tube containing, by mass percent, 14 to 28% of Cr and 6 to 30% of Ni, wherein the steel tube has a metal micro-structure, in which an average dislocation density, which is determined by XRD measurement using a Co tube, is 3.0×10 14 /m 2 or higher, on the inner surface side of the steel tube. The crystal grain size of the steel tube is preferably 50 μm or smaller. The steel tube of the present invention is suitable as a steel tube used in power-generating plants.

Claims (3)

1. An austenitic stainless steel tube containing, by mass percent, 14 to 28% of Cr and 6 to 30% of Ni, wherein the steel tube has a metal micro-structure, in which an average dislocation density, which is determined by XRD measurement using a Co tube, is 3.0×10 14 /m 2 or higher, on the inner surface of the steel tube.

2. The austenitic stainless steel tube according to claim 1 , wherein the grain size of the steel tube is 50 μm or smaller.

3. The austenitic stainless steel tube according to claim 1 , wherein the steel tube is used as a member for a power-generating plant.

Assignments (2)
CHANGE OF NAME Recorded May 14, 2019
From: NIPPON STEEL & SUMITOMO METAL CORPORATION
To: NIPPON STEEL CORPORATION
Reel/Frame 049257/0828 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 28, 2014
From: NISHIYAMA, YOSHITAKA; YONEMURA, MITSUHARU
To: NIPPON STEEL & SUMITOMO METAL CORPORATION
Reel/Frame 032060/0871 →