A high toughness 17-4ph precipitation hardening stainless steel metal cored welding wire

A precipitation hardening, stainless steel technology, applied in the field of metal-cored welding wire, can solve the problems of difficult welding of martensitic precipitation hardening stainless steel, uncontrollable structure ratio, decrease in strength of welded joints, etc., to achieve stable welding arc, improve welding performance and melting speed. quick effect

Active Publication Date: 2021-09-24
BEIJING UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A high toughness 17-4ph precipitation hardening stainless steel metal cored welding wire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1. A 430 stainless steel strip of 10×0.3 (width 10 mm, thickness 0.3 mm) is selected, and the filling rate is 28%. After drawing and reducing the diameter, a welding wire with a diameter of 1.2 mm is obtained.

[0033] The mass percentages of each component in the powder core are: the mass percentage of metal chromium powder is 25%, the mass percentage of metal nickel powder is 18%, the mass percentage of electrolytic metal manganese is 3%, molybdenum iron (Mo %=60%) is 5% by mass, ferroniobium (Nb%=60%) is 2% by mass, pure copper powder is 15% by mass, and 45% ferrosilicon is 2% by mass. The mass percentage of sodium carbonate is 3%, and the mass percentage of potassium titanate is 4%. The balance is reduced iron powder.

[0034] The welding current used during welding is 50A, and the welding voltage is 22V. The welding method is argon arc welding. The welding shielding gas is pure argon gas, and the shielding gas flow rate is 10L / min.

Embodiment 2

[0035] Embodiment 2. A 430 stainless steel strip of 10×0.3 (width 10 mm, thickness 0.3 mm) is selected, and the filling rate is 30%. After drawing and reducing the diameter, a welding wire with a diameter of 1.6 mm is obtained.

[0036] The mass percentages of each alloy composition in the powder core are: the mass percentage of metal chromium powder is 20%, the mass percentage of metal nickel powder is 16%, the mass percentage of electrolytic metal manganese is 2%, molybdenum iron (Mo%=60 %) is 4%, the mass percentage of ferroniobium (Nb%=60%) is 1%, the mass percentage of pure copper powder is 13%, and the mass percentage of 45% ferrosilicon is 0%. The mass percentage of sodium carbonate is 3%, and the mass percentage of potassium titanate is 4%. The balance is reduced iron powder.

[0037] The welding current used during welding is 90A, and the welding voltage is 23V. The welding method is argon arc welding. The welding shielding gas is pure argon gas, and the shielding...

Embodiment 3

[0038]Embodiment 3. A 430 stainless steel strip of 10×0.3 (width 10 mm, thickness 0.3 mm) is selected, and the filling rate is 35%. After drawing and reducing the diameter, a welding wire with a diameter of 3.2 mm is obtained.

[0039] The mass percentages of each alloy composition in the powder core are: the mass percentage of metal chromium powder is 17%, the mass percentage of metal nickel powder is 13%, the mass percentage of electrolytic metal manganese is 1%, molybdenum iron (Mo%=60 %) is 3%, the mass percentage of ferroniobium (Nb%=60%) is 0.5%, the mass percentage of pure copper powder is 11%, and the mass percentage of 45% ferrosilicon is 1%. The mass percentage of sodium carbonate is 2%, and the mass percentage of potassium titanate is 2%. The balance is reduced iron powder.

[0040] The welding current used during welding is 120A, and the welding voltage is 24V. The welding method is argon arc welding. The welding shielding gas is pure argon gas, and the shieldi...

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Abstract

A high-toughness 17-4PH precipitation hardening stainless steel metal core welding wire belongs to the field of material processing engineering and is mainly used for welding and surfacing welding of 17-4PH precipitation hardening stainless steel. The 430 stainless steel strip is used as the cladding layer, and the mass percentage of the alloy composition in the powder core is as follows: the mass percentage of the metal chromium powder is 17-25%, the mass percentage of the metal nickel powder is 13-18%, The mass percentage of manganese is 1-3%, the mass percentage of ferromolybdenum (Mo%=60%) is 0-5%, the mass percentage of niobium (Nb%=60%) is 0.5-2%, pure copper The mass percentage of powder is 11-15%, and the mass percentage of 45% ferrosilicon is 0-2%. The mass percentage of sodium carbonate is 2-4%, and the mass percentage of potassium titanate is 2-4%. The remainder is reduced iron powder. The filling rate of flux-cored wire is 28-35%. Welded joints have excellent toughness and mechanical properties.

Description

technical field [0001] The invention belongs to the field of metal-cored welding wires, and in particular relates to a 17-4PH martensitic precipitation-hardening stainless steel metal-cored welding wire, which is mainly used for welding 17-4PH precipitation-hardening stainless steel, and for corrosion and wear resistance of surfaces such as valves and steam turbine runners. Surfacing occasions. Background technique [0002] 17-4PH is a precipitation hardening martensitic stainless steel equivalent to the Chinese designation 0Cr17Ni4CuNb. The strength level of 17-4PH precipitation hardening stainless steel is equivalent to that of Cr13 martensitic stainless steel, and its corrosion resistance is equivalent to that of 18-8 type austenitic stainless steel. It has good cold and hot processing performance and casting performance, and is widely used in aircraft, engines and missiles , chemical equipment, nuclear reactors, steam turbines and other components. 17-4PH stainless ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30
CPCB23K35/3086
Inventor 李国栋孔维栗卓新孟晓亮
Owner BEIJING UNIV OF TECH
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