WELD METAL WITH EXCELLENT RESISTANCE TO HYDROGEN EMBRITTLEMENT, AND SOLID WIRE FOR SUBMERGED ARC WELDING

摘要

The weld metal of the present invention has a given chemical composition, contains retained austenite particles in an amount of 2,500 grains/mm2 or more, and has a volume fraction of the retained austenite particles of 4.3 vol % or more and a content ratio of Cr and Mn, [Cr]/[Mn], of 0.20 or more. The weld metal has excellent resistance to hydrogen embrittlement even when the weld metal has a high tensile strength of more than 780 MPa.

主权项

1. A weld metal having excellent resistance to hydrogen embrittlement, the metal comprising:
C: 0.02 to 0.12 mass %; Si: 0.18 to 2.00 mass %; Mn: 0.90 to 2.5 mass %; Ni: 1.0 to 3.5 mass %; Cr: 0.3 to 2.0 mass %; Al: greater than 0 mass % and up to 0.030 mass %; N: greater than 0 mass % and up to 0.015 mass %; O: greater than 0 mass % and up to 0.050 mass %; and iron and inevitable impurities; wherein: the weld metal comprises 2500 particles/mm2 or more of retained austenite particles having a circle-equivalent diameter of 0.15 μm or more; a volume fraction of a retained austenite phase is 4.3% or more relative to the entire structures; and a content ratio of Cr and Mn, [Cr]/[Mn], is 0.20 or more.