Gas shielded welding wire for EH47 crack arrest steel

Abstract

The invention discloses a gas shielded welding wire for EH47 crack arrest steel. The gas shielded welding wire comprises the chemical components including, by weight, 0.04%-0.08% of C, 0.60%-0.80% ofSi, 1.30%-1.60% of Mn, less than 0.010% of P, less than 0.005% of S, 0.015%-0.025% of Ti, 1.80%-2.20% of Ni, 0.008%-0.015% of Al, 0.0040%-0.0075% of N, 3.30%-3.50% of Ti / N, 0.410%-0.440% of C+Mn / 8+Ni / 12 and the balance Fe and other inevitable impurities. According to the welding wire, mixed gas of 80% of Ar and 20% of CO2 is adopted for protection, a welding seam meeting the requirements of an EH47 welding joint can be obtained, the welding wire has excellent fracture toughness, and the yield strength of the welding seam is larger than or equal to 460 MPa; and the tensile strength is larger than or equal to 570 MPa, the impact energy at -60 DEG C is larger than 90 J, and the weld joint fracture toughness CTOD value delta 0 is larger than or equal to 0.25 mm (-40 DEG C).

Description

technical field [0001] The invention belongs to the wire rod category of iron and steel products, in particular to a gas-shielded welding wire for EH47 crack arresting steel. Background technique [0002] The localization of my country's high-tech ships and high-end offshore steel products is in the research and development stage. The construction of domestic high-tech ships such as new ultra-large container ships and liquefied gas ships and high-end offshore platforms such as deep-sea platforms requires the import of a large number of high-grade steel plates, including high-grade The supporting welding materials required for steel plate welding are basically all dependent on imports. Corresponding welding consumables are crucial for the smooth realization of localized production and application of new high-grade steel plates such as anti-crack steel for high-tech ships, low-temperature steel, polar steel, marine steel with excellent CTOD performance, and steel for high-humid...

AI Technical Summary

Problems solved by technology

Chinese patent CN102773629 is a low-cost welding wire with good welding processability, but its strength does not meet the requirements of EH47, and it cannot meet the requirements in terms of toughness and crack arrest performance.

[0008] In summary, there is currently a lack of a gas-shielded welding wire that is suitable for EH47 grade in terms of strength and toughness, and has excellent crack arrest performance.

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