High-strength low-temperature-resistant TiO2-series CO2 gas-shielded low-hydrogen type flux-cored wire

Abstract

The invention discloses a high-strength low-temperature-resistant TiO2-series CO2 gas-shielded low-hydrogen type flux-cored wire, which comprises the following components in percentage by mass (based on total mass): 4.5-6.5% of TiO2, 0-0.6% of Al2O3, 0-1% of SiO2, 0-0.5% of ZrO2, 0-0.4% of MgO, 0-0.5% of F, 0-0.15% of C, 0.2-1.5% of Si, 1.0-3.5% of Mn, 0.5-3.5% of Ni, 0.1-1.0% of Mo, 0-0.4% of Ti and 0-0.009% of B. The cold-rolled steel strip for preparing the flux-cored wire comprises the following chemical ingredients by weight content: not more than 0.02% of C, not more than 0.010% of P, and not more than 0.008% of S. The tensile strength of the deposited metal can reach more than 760MPa, the low-temperature impact at -60 DEG C achieves more than 47J, and the diffusible hydrogen content is smaller than 4mL / 100g ( mercury method); and the flux-cored wire has excellent welding operational performance, and is suitable for port machines, ocean platforms, bridges and the like.

Description

technical field [0001] The invention belongs to the field of welding materials, and relates to flux-cored welding wire for shielding gas welding, in particular to a high-strength low-temperature-resistant TiO 2 Department of CO 2 Gas shielded low hydrogen flux cored wire. Background technique [0002] With the increasing exploitation of deep-sea oil and natural gas and the production of military ships such as submarines and aircraft carriers, the use of HY-100 high-strength and low-temperature-resistant special steel will become more and more widely used, thus making the matching The demand for low-temperature steel flux-cored welding wire will increase, but under the current technical conditions, when the acidic low-temperature steel flux-cored welding wire welds 80 kg high-strength steel, its low-temperature impact toughness and crack resistance are poor, and it is impossible to guarantee low-temperature steel flux-cored welding wire. However, the basic low-hydrogen type...

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Problems solved by technology

[0002] With the increasing exploitation of deep-sea oil and natural gas and the production of military ships such as submarines and aircraft carriers, the use of HY-100 high-strength and low-temperature-resistant special steel will become more and more widely used, thus making the matching The demand for low-temperature steel flux-cored welding wire will increase, but under the current technical conditions, when the acidic low-temperature steel flux-cored welding wire welds 80 kg high-strength steel, its low-temperature impact toughness and crack resistance are poor, and it is impossible to guarantee low-temperature steel flux-cored welding wire. However, the welding process performance of the basic low-hydrogen type flux-cored wire is poor, the droplet transfer form is coarse particle transfer, the spatter is large, and the arc stability is poor.

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