Self-shielded flux-cored wire for X80 pipeline steel

The invention provides a self-shielded flux-cored wire for X80 pipeline steel. The self-shielded flux-cored wire comprises wire skin made of mild-carbon steel strips and a flux core, and is characterized in that a formula of powder of the flux core comprises components in percentage by mass as follows: 40%-50% of barium fluoride, 10%-20% of calcium fluoride, 5%-10% of lithium fluoride, 2%-5% of barium carbonate, 1%-5% of cerium fluoride, 1%-2% of ferric oxide, 0%-2% of zirconium oxide, 0%-4% of titanium dioxide, 5%-8% of magnesium powder, 5%-10% of powdered aluminium, 6%-8% of low-carbon ferromanganese, 6%-8% of metallic nickel, 5%-10% of aluminium-zirconium alloy, 1%-5% of quartz and 0%-5% of iron powder. The self-shielded flux-cored wire is suitable for all-position welding of pipelines and good in welding processing property, wire deposited metal has good mechanical properties, impact absorbing energy of a V-shaped notch at the temperature of subzero 40 DEG C of the wire deposited metal reaches 100 J or hi