Self-shielded flux-cored wire for X80 pipeline steel

Abstract

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 higher, and the requirement of welding seam toughness is met.

Description

technical field [0001] The invention relates to a flux-cored welding wire for metal welding, in particular to a self-protecting flux-cored welding wire for X80 pipeline steel welding. Background technique [0002] With the construction and use of large-scale oil and gas transmission pipelines in my country, the requirements for pipeline steel are becoming more and more stringent. On the premise of ensuring the economical construction of the pipeline, the safety and reliability of the operation, not only the pipeline steel itself is required to have excellent toughness, but also the supporting welding materials are required to have excellent toughness. Due to the inherent characteristics of the welding process itself, the toughness of the pipeline steel welded joints is often poor, which becomes the weak link of the pipeline. Improving the toughness of the welded materials and welded joints for pipeline steel has become an urgent problem to be solved. one. The main feature ...

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