Austenitic stainless steel tube excellent in steam oxidation...

Details Austenitic stainless steel tube excellent in steam oxidation... Austenitic stainless steel tube excellent in steam oxidation...

2006-03-21

2006-03-21

Yee, Deborah (Department: 1742)

Metal treatment

Stock

Ferrous

C420S053000, C420S054000

Reexamination Certificate

active

07014720

ABSTRACT:
The present invention provides an austenitic stainless steel tube with a uniform fine grained structure of regular grains, which is not changed to a coarse structure and the steam oxidation resistance is maintained even if the tube is subjected to a high temperature reheating during welding and high temperature bending working. The austenitic stainless steel tube consists of, by mass %, C: 0.03–0.12%, Si: 0.1–0.9%, Mn: 0.1–2%, Cr: 15–22%, Ni: 8–15%, Ti: 0.002–0.05%, Nb: 0.3–1.5%, sol. Al: 0.0005–0.03%, N: 0.005–0.2% and O (oxygen): 0.001–0.008%, and the balance Fe and impurities, the austenitic stainless steel tube having austenitic grain size number of 7 or more and a mixed grain ratio of preferably 10% or less.

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