WELD METAL HAVING EXCELLENT RESISTANCE TO HYDROGEN EMBRITTLEMENT

摘要

The present invention is a weld metal formed by gas shielded arc welding using a flux cored wire, the welded metal having a predetermined chemical composition, residual austenite particles being present in an amount of at least 2500 particles/mm2, and the volume fraction of residual austenite particles being at least 4.0%.

主权项

1. A weld metal comprising iron and
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 %; O: from 0.030 to 0.10 mass %; wherein 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) greater than or equal to 75:
βvalue=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.