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A kind of super duplex stainless steel self-protected flux-cored welding wire and preparation method thereof

A technology of duplex stainless steel and flux-cored wire, applied in welding equipment, manufacturing tools, welding media, etc., can solve the problems of two-phase ratio imbalance, harmful phase precipitation, etc., to improve corrosion resistance, increase diffusion path, weld seam The effect of tissue cleansing and densification

Active Publication Date: 2022-07-01
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

Although super duplex stainless steel has good weldability, common problems of duplex stainless steel welding, such as the imbalance of the two phases and the precipitation of harmful phases, still occur

Method used

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  • A kind of super duplex stainless steel self-protected flux-cored welding wire and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A super duplex stainless steel self-protected flux-cored welding wire adopts SUS430 steel strip as the outer skin, the size of the steel strip is 0.9×14mm, the filling rate of the flux-cored powder in the steel strip is 18.0%, and the diameter of the welding wire is 1.2mm. According to the total mass percentage of 100%, the chemical composition of the steel strip is: Cr 16.4%, Mo 2.5%, Mn 0.34%, Si 0.27%, Ni 0.14%, and the rest are iron; the core powder is alloy powder, chemical Composition: Cr 5.0%, Ni 2.0%, V 0.5%, N 0.1%, Fe 3 O 4 -Al 2 O 3 -Li 2 CO 3 4.0%, CaS 0.5%, ZrO 2 0.2%, Al-Mg 1.0%, Ti 0.5%, and the rest is iron.

[0035] The average particle size of the drug core powder is 100-150 μm, and the nano-nucleating agents CaS, ZrO 2 The particle size is 50-80nm, and the purity is 99.9%.

[0036] The preparation method of the super duplex stainless steel self-protected flux-cored welding wire of the present embodiment includes the following specific steps: ...

Embodiment 2

[0046] A super duplex stainless steel self-protected flux-cored welding wire adopts SUS430 steel strip as the outer skin, the size of the steel strip is 0.9×14mm, the filling rate of the flux-cored powder in the steel strip is 19.0%, and the diameter of the welding wire is 1.2mm. According to the total mass percentage of 100%, the chemical composition of the steel strip is: Cr 16.0%, Mo 2.0%, Mn 0.30%, Si 0.25%, Ni 0.10%, and the rest are iron; the core powder is alloy powder, chemical Composition: Cr 6.0%, Ni 3.0%, V 0.5%, N 0.15%, Fe 3 O 4 -Al 2 O 3 -Li 2 CO 3 5.0%, CaS 0.6%, ZrO 2 0.3%, Al-Mg 2.0%, Ti 1.0%, and the rest is iron.

[0047] The average particle size of the drug core powder is 100-150 μm, and the nano-nucleating agents CaS, ZrO 2 The particle size is 50-80nm, and the purity is 99.9%.

[0048] The preparation method of the super duplex stainless steel self-protected flux-cored welding wire of the present embodiment includes the following specific steps: ...

Embodiment 3

[0058] A super duplex stainless steel self-protected flux-cored welding wire adopts SUS430 steel strip as the outer skin, the size of the steel strip is 0.9×14mm, the filling rate of the flux-cored powder in the steel strip is 20.0%, and the diameter of the welding wire is 1.2mm. According to the total mass percentage of 100%, the chemical composition of the steel strip is: Cr17.0%, Mo 3.0%, Mn 0.40%, Si 0.30%, Ni 0.20%, and the rest are iron; the core powder is alloy powder, Chemical composition: Cr 8.0%, Ni 4.0%, V 1.0%, N 0.2%, Fe 3 O 4 -Al 2 O 3 -Li 2 CO 3 6.0%, La 2 O 3 0.8%, MnS 0.4%, Al-Mg 2.0%, Ti 1.0%, and the rest is iron.

[0059] The average particle size of the core powder is 100-150 μm, and the nano-nucleating agent La 2 O 3 , The particle size of MnS is 50-80nm, and the purity is 99.9%.

[0060] The preparation method of the super duplex stainless steel self-protected flux-cored welding wire of the present embodiment includes the following specific ste...

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Abstract

The invention discloses a super duplex stainless steel self-protected flux-cored welding wire and a preparation method thereof. The self-protected flux-cored welding wire is composed of a steel strip and a flux-cored powder filled in the steel strip, and the total mass percentage is 100%. %, the chemical composition of the steel strip includes: Cr16.0-17.0%, Mo2.0-3.0%, Mn0.30-0.40%, Si0.25-0.30%, Ni0.10-0.20%, and the rest is iron ; The core powder is an alloy powder, and its chemical composition includes: Cr5.0-8.0%, Ni2.0-4.0%, V0.5-1.0%, N0.10-0.20%, ferrite nano-nucleating agent 0.5% ~0.8%, austenite nano-nucleating agent 0.2-0.4%, slag-forming agent 4.0-6.0%, deoxidizer 1.5-3.0%, and the rest are iron. In the present invention, various nucleating agents are added to the self-shielded flux-cored welding wire to promote the equiaxed crystallization of the ferrite and austenite, and the grains of the matrix are refined, so as to obtain a two-phase ratio of ferrite and austenite. It is 50%: 50% refined structure, with excellent comprehensive properties of high strength and high corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a super duplex stainless steel self-shielded flux-cored welding wire and a preparation method thereof. Background technique [0002] With the continuous expansion of the breadth and depth of ocean development, higher requirements have been placed on the corrosion resistance of marine engineering materials. For this reason, a variety of new steel grades have been developed at home and abroad, including ferritic-austenitic duplex stainless steel and super duplex stainless steel. SAF2507 super duplex stainless steel belongs to the third generation duplex stainless steel. It has low carbon content, high nitrogen and molybdenum content, and has a corrosion resistance equivalent PREN value greater than 40. It has better mechanical properties, and has extremely high resistance to pitting and crevice corrosion. Corrosion, stress corrosion (SCC) and uniform corrosion properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3086B23K35/40B23K2103/05
Inventor 易江龙潘琳琳邹晓东牛犇范振华
Owner CHINA-UKRAINE INST OF WELDING GUANGDONG ACAD OF SCI
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