Ferritic heat-resistant steel and method for production thereof

Details Ferritic heat-resistant steel and method for production thereof Ferritic heat-resistant steel and method for production thereof

2007-05-01

2007-05-01

Yee, Deborah (Department: 1742)

Metal treatment

Stock

Ferrous

C148S326000, C148S325000, C148S333000, C148S334000, C148S335000, C420S104000, C420S107000, C420S036000

Reexamination Certificate

active

10311755

ABSTRACT:
A ferritic heat-resistant steel, which exhibits excellent creep characteristics even at a high temperature exceeding 600° C., comprises, on the basis of percent by weight, 1.0 to 13% of chromium, 0.1 to 8.0% of cobalt, 0.01 to 0.20% of nitrogen, 3.0% or less of nickel, 0.01 to 0.50% of one or more of elements selected from a group consisting of vanadium, niobium, tantalum, titanium, hafnium, and zirconium that are MX type precipitate forming elements, and 0.01% or less of carbon and a balance being substantially iron and inevitable impurities, wherein the MX type precipitates precipitate on grain boundaries and in entire grains and the grain boundary existing ratio of an M23C6type precipitate precipitating on the grain boundaries is 50% or less.

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