Steel plate having TiN+ZrN precipitates for welded...

Details Steel plate having TiN+ZrN precipitates for welded... Steel plate having TiN+ZrN precipitates for welded...

2005-11-22

2005-11-22

Yee, Deborah (Department: 1742)

Metal treatment

Stock

Ferrous

C148S333000, C148S334000, C148S335000, C148S336000, C148S654000, C148S330000, C428S682000, C428S683000

Reexamination Certificate

active

06966955

ABSTRACT:
A weldable structural steel product having TiN and ZrN precipitates, which contains, in terms of percent by weight, 0.03 to 0.17% C, 0.01 to 0.5% Si, 0.4 to 2.0% Mn, 0.005 to 0.2% Ti, 0.0005 to 0.1% Al, 0.001 to 0.03% Zr, 0.008 to 0.030% N, 0.0003 to 0.01% B, 0.001 to 0.2% W, at most 0.03% P, at most 0.03% S, at most 0.01% O, and balance Fe and incidental impurities while satisfying conditions of 1.2≦Ti/N≦2.5, 0.3≦Zr/N≦2.0, 10≦N/B≦40, 2.5≦Al/N≦7, and 6.8≦(Ti+Zr+2Al+4B)/N≦17, and having a microstructure essentially consisting of a complex structure of ferrite and pearlite having a grain size of 20 μm or less.

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Nakanishi, Mutsuo et al., “Improvement of Welded HAZ Toughness by Dispersion with Nitride Particles and Oxide Particles”,Journal of Japanese Welding Society, vol. 52, No. 2, p. 49 (1983).

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