High-strength high-toughness submerged arc welding wire for polar ship steel and using method thereof

Abstract

The invention discloses a high-strength high-toughness submerged arc welding wire for polar ship steel and a using method thereof. The submerged arc welding wire comprises, by weight percentage, 0.02-0.13% of C, 0.60-1.2% of Si, 0.40-1.00% of Mn, 0.30-1.00% of Cr, 0.40-1.00% of Ni, less than 0.010% of P, less than 0.005% of S, 0.01-0.10% of Ti, less than 0.60% of Mo, 0.10-0.80% of Cu, 0.01-0.06% of Al, 0.003-0.06% of Nb, 0-0.08% of V, and the balance Fe and inevitable impurities. The welding wire is matched with alkali sintered flux, the polar ship steel is welded, obtained weld metal has very high strength and low temperature impact toughness, the weld joint tensile strength is larger than 510 MPa, and the weld joint impact energy at -60 DEG C is larger than 100 J.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to a high-strength and high-toughness submerged arc welding wire for polar ship steel and a use method thereof. Background technique [0002] The low-temperature steel used in the construction of polar ships, because it is used in low-temperature and cold seas, the marine environment is complex and changeable, and it has to withstand many challenges brought about by ultra-low temperature, ice and snow abrasion, low-temperature wind wave collision, strong ocean storm and frozen soil collision. Higher requirements are put forward for the design, material selection and construction processing of low temperature steel. The low-temperature steel used for polar ships requires excellent comprehensive performance at extremely cold and low temperatures. Its structural materials not only have high strength and good plasticity, but also require excellent impact toughness at -60°C a...

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Problems solved by technology

In the past, there have been many studies on submerged arc welding wires suitable for pipeline steel, construction steel, bridge steel and pressure vessel steel, including the H06C series submerged arc welding wire for new micro-alloyed structural steel with patent publication number CN1701904A, patent publication number It is CN101342645A high-strength high-toughness high-speed submerged arc welding wire for high-grade pipeline steel, patent publication number CN1200317A low-alloy high-strength high-toughness submerged arc welding wire, patent publication number CN1919524A low-alloy ultra-high-strength steel high-toughness submerged arc welding wire Arc welding wire and the patent publication number are CN1343544A high-strength and high-toughness submerged arc welding wire for pressure vessel welding, etc., and their alloy systems basically belong to Si-Mn-Mo-Ti-B and Si-Mn-Ni-Mo systems. The Ni content in the welding wire is low, generally less than 1.5%. Although the toughness can be improved to a certain extent through Ti-B microalloying, the low-temperature impact toughness of the weld metal can only meet the requirements of -40°C. There is no exact data on the fracture toughness index required for the welding of marine engineering equipment, and it is difficult to apply it to ships in polar ultra-low temperature environments

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