Weld metal having excellent resistance to hydrogen embrittlement

A weld metal, comprising:

• iron;
• C:
• from 0.02 to 0.12 mass %;
• Si:
• from 0.10 to 2.00 mass %;
• Mn:
• from 0.90 to 2.5 mass %;
• Ni:
• from 0.20 to 3.5 mass %;
• Ti:
• from 0.040 to 0.15 mass %;
• N:
• a positive amount less than or equal to 0.015 mass %;
• and
• O:
• from 0.030 to 0.10 mass %;
• wherein
• the weld metal is obtained from a wire, which, based on a total mass of the wire, comprises
• Si in a total content of from 0.35% to 2.5%;
• Si in a form of metal Si in a content of 0.25% or more;
• SiO2 in a content of 0.25% or less;
• Ti in a total content of from 2.5% to 4.5%;
• Al in a total content of 0.10% or more;
• Zr in a total content of 0.035% or more;
• and
• Mg in a total content of 0.4% or more,
• the wire has a value A calculated by Expression (a) of 0.30 or more and a ratio B calculated by Expression (b) of more than 4.0:
• A value=Si—[Si/(Ti+2×Al+2×Zr+3.5×Mg)] (a),
• B ratio=(Mn+Ti)/Si (b),
• in the Expression (a) and the Expression (b), Si, Ti, Al, Zr, Mg, and Mn represent a total content of Si, Ti, Al, Zr, Mg, and Mn in the wire, respectively,
• retained austenite particles exist at a density of greater than or equal to 2500 per square millimeter and in a volume fraction of greater than or equal to 4.0%, and
• a β value represented by Formula (1) is greater than or equal to 75:
• β value=320×[C]+50×[Si]+15×[Mn]+10×[Ni]+28×[Mo] (1)
• wherein [C], [Si], [Mn], [Ni], and [Mo] are the mass percent of C, Si, Mn, Ni, and Mo, respectively.