Weld metal having excellent temper embrittlement resistance

摘要

A weld metal according to the present invention has a specific chemical composition, contains carbide particles each having an equivalent circle diameter of greater than 0.5 μm in a number of 0.25 or less per micrometer of grain boundary length, and has an A-value as specified by Formula (1) of 0.12 or more, Formula (1) expressed as follows:
A-value=([V]/51+[Nb]/93)/([Cr]/52+[Mo]/96)   (1)
where [V], [Nb], [Cr], and [Mo] are contents (percent by mass) of V, Nb, Cr, and Mo, respectively, in the weld metal.

主权项

1. A weld metal, comprising: in percent by mass,
C in a content of 0.05% to 0.15%; Si in a content of 0.1% to 0.50%; Mn in a content of 0.60% to 1.30%; Cr in a content of 1.80% to 3.0%; Mo in a content of 0.80% to 1.20%; V in a content of 0.25% to 0.50%; Nb in a content of 0.010% to 0.050%; N in a content of greater than 0% to 0.025%; O in a content of 0.020% to 0.060%, and; wherein the weld metal comprises carbide particles each having an equivalent circle diameter of greater than 0.5 μm in a number of 0.25 or less per micrometer of grain boundary length; and the weld metal has an A-value as specified by Formula (1) of 0.12 or more;
A-value=([V]/51+[Nb]/93)/([Cr]/52+[Mo]/96)  (1)where [V], [Nb], [Cr], and [Mo] are contents, in percent by mass, of V, Nb, Cr, and Mo, respectively, in the weld metal.