Austenitic stainless steel tube for boiler with excellent...

Details Austenitic stainless steel tube for boiler with excellent... Austenitic stainless steel tube for boiler with excellent...

2006-08-23

2011-10-11

Yee, Deborah (Department: 1733)

Metal treatment

Stock

Ferrous

C148S592000, C148S593000, C148S909000, C029S090700, C072S053000

Reexamination Certificate

active

08034198

ABSTRACT:
The present invention relates to an austenitic stainless steel tube for boiler, used for superheater or reheater in thermal power plant, giving excellent resistance to high temperature steam oxidation, in particular to an austenitic stainless steel tube containing 16 to 20% Cr by weight, and being cold-worked at the inner surface of the tube. The Cr concentration in the vicinity of the inner surface of the steel tube is 14% by weight or larger, and the hardness at 100 μm depth from the inner surface of the steel tube is 1.5 times or larger the average hardness of the mother material or is HV 300 or larger.

REFERENCES:
patent: 4086104 (1978-04-01), Kinoshita et al.
patent: 49135822 (1974-12-01), None
patent: 52008930 (1977-01-01), None
patent: 53114722 (1978-10-01), None
patent: 54138814 (1979-10-01), None
patent: 5558329 (1980-05-01), None
patent: 58039733 (1983-03-01), None
patent: 2228468 (1990-09-01), None
patent: 6322489 (1994-11-01), None
Machine-English translation of Japanese patent 06-322489, Otsuka Nobuo et al., Nov. 22, 1994.
Kanero et al.; “Mechanical Properties of Shot-Blasted Stainless Steel Boiler Tubings”; Thermal and Nuclear Power Engineering, Apr. 1979; pp. 99-105; vol. 30; No. 4. (Partial English-Language Translation Attached).

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