High-strength and high-toughness submerged arc welding wire for deep-sea pipeline welding

Abstract

Disclosed is a high-strength and high-toughness submerged arc welding wire for deep-sea pipeline welding. The welding wire is prepared from, by mass, 0.04-0.09% of C, 0.1-0.3% of Si, 1.6-1.8% of Mn, 0.3-0.5% of Mo, 0.15-0.5% of Ni, 0.04-0.12% of Ti, 0.004-0.001% of B, less than 0.012% of P, less than 0.003% of S and the balance ferrum. The welding wire has the advantages of reasonable components and reliable performance. The high-strength and high-toughness submerged arc welding wire for deep-sea pipeline welding belongs to an Mn-Mo-Ti-B alloy system, has the features of multi-component alloy, and can adjust components weld metal and improve mechanical properties of welds. When the welding wire is applied to thick-walled deep-sea pipeline welding, low-temperature impact toughness and low-temperature CTOD (crack tip opening displacement) performance of the welds are good, Charpy impact absorption of the welds and welding lines can meet requirements, and margin is large. The defects of an existing deep-sea pipeline build-up welding material are overcome, and the welding wire has good economic and social benefits.

Description

technical field [0001] The invention relates to a metal welding material, in particular to a high-strength submerged arc welding wire for deep-sea pipeline welding. Background technique [0002] my country has a vast ocean area, which contains very rich marine oil and gas resources. For example, the oil and gas reserves in the South China Sea are equivalent to one-third of my country's total oil and gas resources, which are very important for the development of offshore oil fields. Offshore oil fields generally use submarine pipelines to transport oil and gas and other resources. The working environment of the submarine pipeline is very harsh. It not only bears a large internal pressure, but also withstands the external pressure of seawater and environmental loads such as wind, waves, currents, ice and earthquakes, which cause pipeline translation and vibration. Therefore, the submarine pipeline is required to have the ability to resist large deformation, and the steel pip...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a submerged arc welding wire for deep-sea pipelines to improve the low Charpy impact absorption energy of the weld center and the fusion line and the low temperature of the weld seam when the existing submerged arc welding materials are used to weld deep-sea pipelines. Technical problems such as poor impact toughness and weld fracture when the welded joint is stretched transversely

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