High-toughness 17-4PH precipitation-hardening stainless steel metal core welding wire

Abstract

The invention relates to a high-toughness 17-4PH precipitation-hardening stainless steel metal core welding wire, and belongs to the field of material processing engineering. The high-toughness 17-4PHprecipitation-hardening stainless steel metal core welding wire is mainly used for welding and overlaying 17-4PH precipitation-hardening stainless steel. A 430 stainless steel band is adopted as a coating layer; a powder core contains the alloy components in percentage by mass: 17 to 25 percent of metal chromium powder, 13 to 18 percent of metal nickel powder, 1 to 3 percent of electrolytic manganese metal, 0 to 5 percent of ferro-molybdenum (the percent of Mo is equal to 60 percent), 0.5 to 2 percent of ferroniobium (the percent of Nb is equal to 60 percent), 11 to 15 percent of pure copperpowder, 0 to 2 percent of ferrosilicon with the silicon content being 45 percent, 2 to 4 percent of sodium carbonate, 2 to 4 percent of potassium titanate, and the balance reduced iron powder; and thefilling rate of a flux-cored wire ranges from 28 to 35 percent. A welded joint has excellent toughness and mechanical property.

Description

Technical field [0001] The invention belongs to the field of metal core welding wire, and specifically relates to a 17-4PH martensitic precipitation hardening stainless steel metal core welding wire, which is mainly used for welding of 17-4PH precipitation hardening stainless steel, as well as corrosion and wear resistance of valves, steam turbine runners, etc. Overlay welding occasions. Background technique [0002] 17-4PH is a precipitation hardening martensitic stainless steel, equivalent to the Chinese brand 0Cr17Ni4CuNb. The strength level of 17-4PH precipitation hardening stainless steel is equivalent to Cr13 martensitic stainless steel, and the corrosion resistance is equivalent to 18-8 type austenitic stainless steel. It has good cold and hot workability and casting performance, and is widely used in aircraft, engines, and missiles. , Chemical equipment, nuclear reactors, steam turbines and other components. 17-4PH stainless steel is widely used in foreign countries, bu...

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Problems solved by technology

[0007] In addition, when 17-4PH precipitation hardening stainless steel is welded with solid wire, since the wire rod used to manufacture the solid wire is generally from a steel factory, its chemical composition cannot be adjusted, and the proportion of each structure in the weld cannot be adjusted.

When a certain amount of δ-ferrite is produced in the weld, although it can improve the welding performance of the steel and improve the plasticity of the steel, but when machining at 17-4PH, the excessive δ-ferrite can be formed along the deformation direction The strip shape reduces the mechanical properties of the steel, which brings a certain degree of difficulty to the welding of 17-4PH martensitic precipitation hardening stainless steel, and also brings certain restrictions to the application of 17-4PH stainless steel

In addition, when there are too many austenite-forming elements in the solid welding wire, residual austenite will be formed during the cooling process of the weld seam, which will reduce the strength of the welded joint

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