1000 MPa-level high-strength all-position ultra-low hydrogen flux-cored wire and welding method thereof

Abstract

The invention provides a 1000 MPa-level high-strength all-position ultra-low hydrogen flux-cored wire which comprises a carbon steel sheath and a flux core. The flux core comprises the ingredients of, in percentage by mass, 2-4% of SrCO3, 3-6% of CaF2, 25-35% of TiO2, 3-10% of feldspar, 2-5% of Si-Fe; 2-5% of Mg, 0.2-0.5% of C, 0.4-1.0% of Zr-Fe, 8-15% of Mn, 3-6% of Cr, 18-20% of Ni, 3-7% of Mo, 1.5-3% of Fe3O4 and the balance Fe of the total amount of the flux core. A titanium alkali type slag system is adopted for the flux-cored wire, a slagging constituent and an arc stabilizing substance are added into the flux core, molten slag can completely cover weld metal, the tensile strength Rm of the deposited metal is larger than or equal to 980 MPa, the elongation rate A is larger than or equal to 13%, the deposited metal charpy impact KV2 (-60 DEG C) is larger than or equal to 34 J, and the 1000 MPa-level high-strength all-position ultra-low hydrogen flux-cored wire is suitable for all-position welding.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a 1000MPa-level high-strength all-position ultra-low hydrogen flux-cored welding wire and a welding method thereof, which can be applied to 1000MPa-level low-alloy high-strength steel welding. Background technique [0002] With the continuous development of steelmaking technology, steel companies have developed steel grades with ultra-high strength and high plasticity and toughness by using refining technology, micro-alloying technology, and controlled rolling and controlled cooling (TMCP) technology. Especially since entering the 21st century, my country's low The research and development of high-strength alloy steel has entered a stage of rapid development. World-leading steel grades with a tensile strength of 400-1000 MPa have been continuously developed and widely used in construction machinery, marine structures, bridge construction and other fields. [...

AI Technical Summary

Problems solved by technology

[0003] However, the use of ultra-high-strength steel plates poses a greater challenge to welding technology. It is required to select welding materials with matching strength, and have good welding performance, crack resistance, comprehensive strength and toughness, and good fatigue resistance. Crack growth capability requires further research and development of matching high-efficiency, high-quality, low-cost welding materials

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