Appeal 2007-2242
Application 10/352,997
Molybdenum (Mo), 2.0-5.0 % of Tungsten (W), and 0.13-0.30% of Nitrogen
(N) (Lee, p. 16, ll. 3-5).1
4. Lee teaches that, with regard to Cu, “[p]articularly, in the duplex
stainless steel which contains 22.5-23.5% of Cr, the impact toughness is
improved by adding Cu” (Lee, p. 4, ll. 31-32).
5. Lee teaches that, with regard to Cu, “it is preferable to limit the
content of Cu to less than 2.0%, and more preferably to less than 1.0%”
(Lee, p. 4, l. 33)
6. Lee teaches that, with regard to Ni, “the content of Ni should
preferably be limited to 5-8%” (Lee, p. 4, ll. 38-39).
7. Lee teaches that, with regard to Ni, “if the content of Ni departs
from the proper range, the ratio of the austenite phase to the ferrite phase is
disturbed, with the result that the duplex stainless steel loses its intrinsic
properties” (Lee, p. 4, ll. 34-36).
8. Lee teaches that, with regard to Cr, “if [the content of Cr] exceeds
27%, the precipitation rate of intermetallic compounds becomes faster, with
the result that the corrosion resistance and the impact toughness are
decreased” (Lee, p. 4, ll. 41-43).
9. Lee teaches that, with regard to N, “the content of N should be
preferably limited to 0.13-0.27%. However, if the content of S is less than
0.002%, the content of N can be increased up to 0.3%” (Lee, p. 4, ll. 57-58).
1 We take “mass %” and “weight %” to be proportionately equivalent terms.
In so doing, we follow the Applicants and the Examiner, who have not
distinguished the two measures.
4
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 Next
Last modified: September 9, 2013