Metal treatment – Stock – Ferrous
Reexamination Certificate
2006-03-31
2009-02-03
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Ferrous
C148S909000, C148S591000, C148S592000, C148S593000, C148S606000, C148S607000, C148S654000, C148S663000, C148S664000
Reexamination Certificate
active
07485197
ABSTRACT:
In a martensitic stainless steel tube according to the present invention, the content is determined by each of elements C, Si, Mn and Cr, and the bubble content ratio is further prescribed in accordance with the scale thickness on the outer surface of the steel tube, so that defects can be detected with high precision in the non-destructive inspection, such as ultrasonic test or the like. This allows the non-destructive inspection to be carried out with high efficiency. Moreover, there is another advantage that the weather resistance can be enhanced. The steel tube according to the present invention and the manufacturing method thereof can be suitably used in all of the technical fields in which a martensitic stainless steel tube having equal chemical composition is treated.
REFERENCES:
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patent: 6332934 (2001-12-01), Tanida et al.
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Computer-generated English translation of Japanese patent 2003-226941, Tanida et al., Aug. 15, 2003.
Clark & Brody
Sumitomo Metal Industries Ltd.
Yee Deborah
LandOfFree
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