Submerged arc welding consumables for duplex stainless steel

Abstract

The invention discloses a submerged arc flux-cored wire welding flux for duplex stainless steel. A flux-cored wire comprises a wrapper and core powder; the wrapper contains the following components in percent by weight: smaller than or equal to 0.04% of C, 0.1-1.0% of Si, 1.0-2.0% of Mn and 5-15% of Cr; the core powder comprises 30-45% of Cr, 20-35% of Ni, 10-25% of Mo, 1-10% of iron nitride and 1-5% of rare earth oxide; the core powder filling rate is 18-30%; the ratio of the rare earth oxide to the nitride is 0.5-0.9; the welding flux comprises the following components: 8-16% of CaF2, 10-18% of Al2O3, 10-16% of SiO2, 5-15% of BaO, 5-15% of SrCO3 and a proper amount of a bonding agent.

Description

technical field [0001] The invention relates to a submerged arc welding material for stainless steel, in particular to a submerged arc flux-cored welding wire and flux for duplex stainless steel. Background technique [0002] Due to its excellent corrosion resistance and high strength, duplex stainless steel has been widely used in chemical containers, oil wells, LNG ships, seawater desalination equipment, vehicle manufacturing and other fields, among which 2205 (UNS S32205) is the most widely used. The pitting corrosion resistance of duplex stainless steel is better than that of traditional austenitic stainless steel 304L and 316L. [0003] Manual arc welding, gas shielded arc welding, and submerged arc welding are the most commonly used welding methods for duplex stainless steels. The prior art JP4672177 provides a combination of solid wire and flux for submerged arc welding, which is less difficult to process and less likely to cause welding defects; the solid wire is de...

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a flux-cored welding wire and flux for submerged arc welding of duplex stainless steel, so as to solve the problem of difficult processing caused by solid-core welding wire and improve the welding process performance at the same time. Improve welding efficiency

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