Low-temperature steel flux-cored wire

Abstract

The invention discloses a low-temperature steel flux cored wire. Flux core of the flux cored wire comprises the following raw materials by weight percentage: 28 to 33 percent of rutile, 1 to 3 percent of aedelforsite, 14 to 18 percent of silicon-manganese alloy, 16 to 21 percent of ferrous powder, 2 to 4 percent of nickel powder, 1 to 2 percent of cryolite, 5 to 7 percent of feldspar, 1.5 to 2.5 percent of ferrotitanium, 0.5 to 1 percent of ferroboron, 5 to 6 percent of mid-carbon ferromanganese, 2.5 to 4 percent of magnesite, 4 to 6 percent of quartz and 1.5 to 3.5 percent of fluorite. Compared with the similar product of the prior art, the flux cored wire belongs to the meta-acid slag series, and has the advantages of good electric arc stability, less splash, easy slag removal, good low-temperature impact ductility, good low-temperature crack resisting performance, high efficiency and low cost.

Description

Technical field: [0001] The invention belongs to the field of metal welding, in particular to a low-temperature steel flux-cored welding wire. Background technique: [0002] At present, steel structures for offshore operations such as drilling derricks and production platforms are mainly used, including LPG (liquefied petroleum gas) ships, refrigeration ships and other ships, production equipment in cold regions, oil pipelines and other steel structures. To prevent brittle failure at low temperature, low temperature steel is often used for construction. With the increasing exploitation of offshore oil and natural gas, and the expansion of the mining area from the shallow warm area in the past to the deep cold area, low-temperature steel will be used in large quantities in marine structural parts. Thereby, the demand for the low-temperature steel flux-cored welding wire used for welding low-temperature steel is increased, but the low-temperature steel flux-cored welding wire...

AI Technical Summary

Problems solved by technology

Thereby, the demand for the low-temperature steel flux-cored welding wire used for welding low-temperature steel is increased, but the low-temperature steel flux-cored welding wire of the prior art is all, because the low-temperature impact toughness and low-temperature crack resistance of the acidic slag-based flux-cored welding wire are very poor. Poor, the average value of impact energy at -40°C low temperature cannot meet the requirement of greater than 27J (Joules); while the welding process performance of the alkaline slag system is poor, the arc stability is poor, there is more spatter, difficult slag removal, low efficiency and cost higher