Super duplex stainless steel flux-cored wire for impeller additive repair and preparation method and application of super duplex stainless steel flux-cored wire

A duplex stainless steel and flux-cored welding wire technology, which is applied in welding equipment, manufacturing tools, welding media, etc., can solve the problem that there is no wire for additive repair of super duplex stainless steel impellers, and achieve high-efficiency, reliable and quality-guaranteed defect repair , Improving the ability to resist intergranular corrosion and increasing the Cr content

Active Publication Date: 2022-06-07
CHINA-UKRAINE INST OF WELDING GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] On the whole, the currently published flux-cored welding wires for arc additives mainly control the microstructure ratio and material properties of additively formed parts by adjusting the composition and ratio of alloying elements. Development of Wire Materials for Wood Restoration

Method used

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  • Super duplex stainless steel flux-cored wire for impeller additive repair and preparation method and application of super duplex stainless steel flux-cored wire
  • Super duplex stainless steel flux-cored wire for impeller additive repair and preparation method and application of super duplex stainless steel flux-cored wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A super duplex stainless steel flux-cored welding wire for impeller additive repair, using S32205 duplex steel strip (chemical composition mass fraction: 22.0% Cr, 5.0% Ni, 3.5% Mo, 0.20% N, the balance is iron and impurities) is the outer skin, the width of the outer skin is 12mm, and the thickness is 0.6mm; the filling amount of the flux-cored powder (the percentage of the flux-cored powder in the total mass of the welding wire) is 30%; the diameter of the flux-cored welding wire is 1.6mm. The super duplex stainless steel model used in the manufacture of the super duplex stainless steel impeller is S32750. In terms of mass fraction, the core powder is composed of the following components: chromium 6.04%, nickel 1.30%, molybdenum 0.84%, tungsten 1.50%, silicon 0.12%, yttrium carbonate 1.30%, zirconium-nickel alloy powder (containing 70.00% Zr) 4.00 %, high nitrogen ferrochromium (containing 10.0% N, 65% Cr) 4.32%, anatase 0.90%, mullite 1.10%, and the balance is Fe. T...

Embodiment 2

[0034] A super duplex stainless steel flux-cored welding wire for impeller additive repair, using S32205 duplex steel strip (chemical composition mass fraction: 22.0% Cr, 5.0% Ni, 3.5% Mo, 0.20% N, the balance is iron and impurities) is the outer skin, the width of the outer skin is 12mm, and the thickness is 0.6mm; the powder filling amount (the percentage of the flux cored powder in the total mass of the welding wire) is 30%; the diameter of the flux cored welding wire is 1.6mm. The super duplex stainless steel model used in the manufacture of the super duplex stainless steel impeller is S32750. In terms of mass fraction, the core powder is composed of the following components: chromium 6.04%, nickel 4.30%, molybdenum 0.84%, tungsten 1.50%, silicon 0.12%, yttrium carbonate 1.30%, zirconium-nickel alloy powder (containing 70.00% Zr) 4.00 %, high nitrogen ferrochromium (containing 10.0% N, 65% Cr) 4.32%, anatase 0.90%, mullite 1.10%, and the balance is Fe. The Cr content in t...

Embodiment 3

[0037] A super duplex stainless steel flux-cored welding wire for impeller additive repair, using S32205 duplex steel strip (chemical composition mass fraction: 22.0% Cr, 5.0% Ni, 3.5% Mo, 0.20% N, the balance is iron and impurities) is the outer skin, the width of the outer skin is 12mm, and the thickness is 0.6mm; the powder filling amount (the percentage of the flux cored powder in the total mass of the welding wire) is 30%; the diameter of the flux cored welding wire is 1.6mm. The super duplex stainless steel model used in the manufacture of the super duplex stainless steel impeller is S32750. In terms of mass fraction, the core powder is composed of the following components: chromium 11.24%, nickel 0.30%, molybdenum 0.84%, tungsten 1.50%, silicon 0.12%, yttrium carbonate 1.30%, zirconium-nickel alloy powder (including 70.00% Zr) 4.00 %, high nitrogen ferrochromium (containing 10.0% N, 65% Cr) 4.32%, anatase 0.90%, mullite 1.10%, and the balance is Fe. The Cr content in t...

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Abstract

The invention discloses a super duplex stainless steel flux-cored wire for impeller additive repair and a preparation method and application of the super duplex stainless steel flux-cored wire. The super duplex stainless steel flux-cored wire is composed of an outer skin and flux core powder filled in the outer skin, and the flux core powder is composed of, by mass, 6.04%-11.24% of chromium, 0.30%-4.30% of nickel, 0.72%-1.08% of molybdenum, 1.50%-2.00% of tungsten, 0.12%-0.18% of silicon, 1.00%-1.50% of yttrium carbonate, 3.34%-5.00% of zirconium-nickel alloy, 3.60%-5.40% of high-nitrogen ferrochrome, 0.80%-1.00% of anatase, 1.00%-1.20% of mullite and the balance iron. And the balance of iron. According to the method, based on the flexibility of component modification of the flux-cored powder in the flux-cored wire, welding wire alloy element component adjustment is conducted according to the material of the impeller needing to be repaired and information feedback in the actual operation process, and efficient, reliable and quality-guaranteeing defect repair is achieved; the heat accumulation of the repaired part may cause more austenite phases, and by increasing the Cr content and reducing the Ni content in the flux-cored wire, on one hand, the production cost of the flux-cored wire is reduced, and on the other hand, the proportion of the austenite phases and ferrite phases in a matrix is also improved.

Description

technical field [0001] The invention relates to the technical field of welding of material processing engineering, in particular to a super duplex stainless steel flux-cored welding wire used for impeller additive repair and a preparation method and application thereof. Background technique [0002] Due to its high strength, high Young's modulus and high corrosion resistance, super duplex stainless steels are widely used in extremely corrosive environments in industries such as oil and gas, petrochemical, pressure vessels and seawater equipment. The high levels of chromium, nitrogen and molybdenum in super duplex stainless steels provide excellent resistance to intergranular corrosion, crevice corrosion and pitting corrosion. At present, the impeller made of super duplex stainless steel is the key part of the circulating pump of the nuclear power plant, and its quality is directly related to the safe and reliable operation of the pump. As the running time increases, the imp...

Claims

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Application Information

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IPC IPC(8): B23K35/02B23K35/30B23K35/40
CPCB23K35/0266B23K35/3086B23K35/40Y02P10/25
Inventor 潘琳琳黄锨航曹艺牛犇邹晓东易江龙
Owner CHINA-UKRAINE INST OF WELDING GUANGDONG ACAD OF SCI
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