High hardness ferritic stainless steel wearable surfacing flux-cored wire

Abstract

The invention provides a high hardness ferrite stainless steel wearable flux-cored wire, which takes a low carbon steel H08A cold rolling thin steel strip as an external wrapper; furthermore, the wrapper is internally provided with a powder core which is composed of graphite, metal and alloy powder; the weight percentages of all ingredients of the powder core are 50-75% of high carbon ferrochrome, 10-16% of ferrovanadium, 6-10% of ferrotitanium, 2-10% of tungsten carbide, 2-3% of nickel powder, 1.5-2.5% of silver graphite, 1-3.5% of boron carbide, 1-2% of aluminium magnesium powder, 0-10% of metallic chromium, and the residual quantity of reduced iron powder; the filling proportion of the powder core is 46-50%; the invention adopts the technical proposal that high-content ferrovanadium and adequate alloy powders such as tungsten carbide and boron carbide, etc. are added into the flux-cored wire, changes the microstructure of the existing ferrite stainless steel flux-cored wire surfacing alloy, overcomes the shortages of poor wearability and ductility, and can be applied to submerged arc bead weld manufacture or repair of the parts which has high requirement of abrasion and the corrosion resistance of the wearable grain.

Description

technical field [0001] The present invention relates to a metal surfacing material, in particular to a high-hardness ferritic stainless steel wear-resistant surfacing welding used for the manufacture or repair of components requiring wear resistance and corrosion resistance, so as to improve the service life of the equipment Flux cored wire. Background technique [0002] In welding production operations, it is often required to carry out surfacing welding manufacturing or repair on the surface of parts with poor surface wear resistance, surface wear or local area damage. Using slag, gas or slag gas combined protection, a layer of wear-resistant, heat-resistant or corrosion-resistant metal layer is surfacing on the surface of mechanical parts to endow the surface with special properties. This process has been adopted by many enterprises. The welding materials used include coated electrodes, solid welding wires and flux-cored welding wires. Among them, the surfacing welding o...

AI Technical Summary

Problems solved by technology

For example, the solid wire H25Cr3Mo2MnV used by domestic iron and steel enterprises to repair rolls still has the problem of insufficient wear resistance, while the flux-cored wire alloy systems developed at home and abroad mostly use Cr-Mo, Cr-Mo-V, Cr-Mo-W-V, Cr-Ni-Mo-V, Ct-Mo-W-V-Nb mainly

High-chromium cast iron with good wear resistance and corrosion resistance, if supplied in the form of flux-cored welding wire, due to the large heat input of the weld seam during submerged arc surfacing welding, the formed carbides are too thick, and the surfacing alloy has poor toughness , even if the stress reduction methods such as preheating and post-weld heat treatment are adopted, cracking is still easy during submerged arc surfacing, which makes the production efficiency of the enterprise low and the energy consumption is large

Most small enterprises use their welding rods for manual surfacing operation, which has low production efficiency and high manufacturing and repair costs

In addition, atmospheric environments such as coastal areas, thermal power plants and some chemical workshops contain a large number of corrosive ions (such as: Cl - 、H + ) and SO 2 , SO 3 Gas, which is very corrosive to the wear-resistant parts on the equipment. Although ferritic stainless steel has excellent corrosion resistance, it has poor wear resistance.