Flux-cored wire for welding stainless steel used in high-temperature environment

Abstract

The invention relates to a flux-cored wire for welding stainless steel used in a high-temperature environment. The flux-cored wire is composed of flux-cored powder and a stainless steel band wrapping the flux-cored powder, wherein the flux-cored powder accounts for 15-25% of the total weight of the flux-cored wire, for example, 20-25% of the total weight of the flux-cored wire, and the flux-cored powder comprises, by mass, metal chromium powder, metal nickel powder, medium-carbon ferromanganese, chromium nitride, rutile. silicon-calcium-barium alloy, sillimanite, fluorite, rare earth fluoride, magnesia and aluminum powder. The flux-cored wire is prepared according to the following method: rolling the stainless steel band into a U shape, and adding prepared flux-cored powder into a U-shaped groove; after the U-shaped groove is closed, sequentially conducting rolling forming and continuous drawing diameter reducing treatment to obtain a welding wire; and mechanically cleaning the surface of the welding wire to obtain a final product of the flux-cored wire. The invention also provides a method for preparing the flux-cored wire. The flux-cored wire has the excellent technical effects as described in the specification.

Description

technical field [0001] The invention belongs to the field of welding materials, and relates to a flux-cored welding wire for stainless steel welding, in particular to a flux-cored welding wire for welding stainless steel used in high-temperature environments. The flux-cored welding wire of the present invention is mainly used for welding stainless steel used in high-temperature environments or welding stainless steel and other dissimilar steels. Background technique [0002] Judging from the current level of thermal power generation technology in the world, the technologies that are vigorously developed include clean coal power generation technology that improves the efficiency of thermal power units and reduces pollution. The main way to improve the efficiency of thermal power units is to increase the pressure and temperature of steam, and develop supercritical and ultra-supercritical units. With the development of electric power industry and boiler equipment technology, i...

AI Technical Summary

Problems solved by technology

At present, for the welding of stainless steel in high temperature environment and stainless steel and dissimilar steel, solid welding wire and welding rod are mainly used. Solid welding wire is generally welded by argon arc welding, which has problems such as low efficiency and difficult composition adjustment. Sometimes even high-alloy welding materials are used. The production cost is greatly increased, and the mechanical properties of the welded stainless steel after heat treatment are unstable, which is not conducive to the safe operation of the equipment

Flux-cored wire has high efficiency, easy to use, and low cost, but the conventionally used stainless steel flux-cored wire, after high-temperature heat treatment, the mechanical properties of the weld metal, especially the toughness and plasticity, will drop sharply, which cannot meet the use requirements.