Flux-cored wire special for maritime work low-temperature high-strength steel

Abstract

The invention discloses a flux-cored wire special for maritime work low-temperature high-strength steel. The flux-cored wire is composed of carbon steel skin and a flux core. The flux-cored wire comprises, by mass, 35%-40% of rutile, 2%-5% of magnesium oxide and / or calcium oxide, 0.5%-2% of zircon sand, 15%-25% of low-carbon ferromanganese, 4%-6% of magnesium fluoride, 2%-4% of aluminum magnesium alloy, 7%-10% of ferrosilicon, 5%-8% of ferrotitanium, 0.5%-2% of rare earth oxide, 9%-11% of nickel powder and the balance iron powder and inevitable impurities. The flux-cored wire does not contain boron (B) and has excellent welding technological performance. The comprehensive performance of deposited metal and welded joints is that the yield strength is larger than or equal to 470 MPa, the tensile strength is larger than or equal to 550 MPa, the elongation is larger than or equal to 22%, and KV2 is larger than or equal to 50 J when the temperature is -60DEG C.

Description

technical field [0001] The invention relates to a special flux-cored welding wire for marine low-temperature high-strength steel. Background technique [0002] Flux-cored welding wire has good welding process performance and welding efficiency, and has been used more and more in shipbuilding, marine engineering and other industries. In the construction of offshore oil drilling platforms, a large number of low-temperature high-strength steel welding materials are required, especially good low-temperature impact toughness. flux cored wire. At the same time, since many large and thick plates are used in offshore oil drilling platforms, good crack resistance is also required for welding materials. [0003] At present, high-strength steel plates commonly used in drilling platforms and offshore projects mainly include A514, A517, EQ70, WELDOX700, EQ51, EQ63, etc., and the corresponding welding materials are all products from the United States and Italy. [0004] CN101450426B dis...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a kind of non-additional boron (B) element whose mechanical properties can meet the impact toughness requirements of -60°C in view of the poor crack resistance and unsatisfactory low-temperature impact toughness of welding materials in the prior art. Flux-cored welding wire for marine low-temperature high-strength steel that meets higher yield strength grades

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