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Repair welding wire for flaws of cast two-phase stainless steel 6A

A duplex stainless steel, defect technology, applied in the direction of welding medium, manufacturing tools, welding equipment, etc., can solve the problems of reducing erosion corrosion resistance and cavitation corrosion resistance, high scrap rate, scrapping of original parts, etc. Achieve good erosion corrosion resistance and cavitation corrosion resistance, stable and reliable welding process, and improve efficiency

Active Publication Date: 2011-02-16
LUOYANG SUNRUI SPECIAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 25Cr-7Ni-Mo-N (6A) is generally made of castings by casting. For this reason, casting defects are usually unavoidable. Repairing welding for casting defects is a very important part of the production of pump body castings. In addition to a reasonable welding process for repair welding repair, it is very important to choose the repair welding material. Wrong or unqualified repair welding materials will directly lead to the scrapping of the original parts.
Due to the mismatch between other welding materials and the base metal composition of 25Cr-7Ni-Mo-N (6A), the performance of casting defect parts deteriorates after repair welding, which reduces the resistance of 25Cr-7Ni-Mo-N (6A) Erosion corrosion performance and cavitation corrosion resistance, high reject rate, greatly limit the application of 25Cr-7Ni-Mo-N (6A) in pump and valve castings, resulting in great waste

Method used

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  • Repair welding wire for flaws of cast two-phase stainless steel 6A
  • Repair welding wire for flaws of cast two-phase stainless steel 6A
  • Repair welding wire for flaws of cast two-phase stainless steel 6A

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: The overall composition of the repair welding wire of the present invention is shown in the following table by weight percentage.

[0047] Fe

[0048] After batching according to the above table and according to the above-mentioned production method, a φ2mm repair welding wire is finally formed, and the repair welding wire meets the mechanical performance indicators of fracture strength, yield strength and reduction of area.

[0049] The specific welding parameters are shown in the table below:

[0050] Welding current (A)

[0051] A complete repair welding repair part includes the weld seam and heat-affected zone. Usually, the percentage of the ferrite phase in the repair welding repair part of duplex stainless steel, including the weld seam, heat-affected zone and base metal, to all phases is determined. The phase structure of repaired parts can be determined more comprehensively. Adopt repair welding welding wire of the present inve...

Embodiment 2

[0058] Embodiment 2: The overall composition of the repair welding wire of the present invention is shown in the following table by weight percentage.

[0059] Fe

[0060] After batching according to the above table and according to the above-mentioned production method, a φ2mm repair welding wire is finally formed, and the repair welding wire meets the mechanical performance indicators of fracture strength, yield strength and reduction of area.

[0061] The specific welding parameters are as follows:

[0062] Welding current (A)

[0063] A complete repair welding repair part includes the weld seam and heat-affected zone. Usually, the percentage of the ferrite phase in the repair welding repair part of duplex stainless steel, including the weld seam, heat-affected zone and base metal, to all phases is determined. The phase structure of repaired parts can be determined more comprehensively. Adopt repair welding welding wire of the present invention after re...

Embodiment 3

[0069] Embodiment 3 The overall composition of the repair welding wire according to the present invention is shown in the table below.

[0070] Fe

[0071] After batching according to the above table and according to the above-mentioned production method, a φ2mm repair welding wire is finally formed, and the repair welding wire meets the mechanical performance indicators of fracture strength, yield strength and reduction of area.

[0072] The specific welding parameters are as follows:

[0073] Welding current (A)

[0074] A complete repair welding repair part includes the weld seam and heat-affected zone. Usually, the percentage of the ferrite phase in the repair welding repair part of duplex stainless steel, including the weld seam, heat-affected zone and base metal, to all phases is determined. The phase structure of repaired parts can be determined more comprehensively. Adopt repair welding welding wire of the present invention after repairing 25Cr-7Ni...

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Abstract

The invention discloses a repair welding wire for flaws of cast two-phase stainless steel 6A. The two-phase stainless steel 6A refers to 25Cr-7Ni-Mo-N(6A), and the repair welding wire basically comprises: carbon: not larger than 0.03%, silicon: not larger than 0.7%, manganese: not larger than 0.7%, chrome: 25.0-26.0%, molybdenum: 3.0-3.2%, copper:0.5-0.7%, tungsten: 0.5-1.0%, nickel: larger than 8.5-9.0%, nitrogen: 0.30-0.40%, other unavoidable impurities and elements: smaller than 0.06%, and the balance of iron. The repair welding wire with phi 2mm is finally formed by carrying the steps of refining, hot forging, multiple cold pulling and annealing on the basic constituents, satisfies the requirements of the two-phase stainless steel 6A on erosion corrosion resistance and cavitation corrosion resistance, and guarantees that a flawed repair welded position of the cast two-phase stainless steel 6A has favorable erosion corrosion resistance and cavitation corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of welding materials, in particular a welding wire specially used for repairing defects after casting of duplex stainless steel 6A. The duplex stainless steel 6A is specifically referred to as 25Cr-7Ni-Mo-N (6A) in the invention. Background technique [0002] 25Cr-7Ni-Mo-N (6A) is only one of the types of duplex stainless steel. In the structure of this material, the ferrite phase and the austenite phase account for almost half, so 25Cr-7Ni-Mo -N(6A) has both the characteristics of austenitic stainless steel and ferritic stainless steel. Compared with ferritic stainless steel, 25Cr-7Ni-Mo-N(6A) has higher plasticity and toughness, and has no room temperature brittleness. , Intergranular corrosion resistance and welding performance are significantly improved, while maintaining the 475 ° C brittleness of ferritic stainless steel, high thermal conductivity, and superplasticity. Compared with austenitic stainle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/40B23K35/30
Inventor 杨志敏陈继志张豪董飞
Owner LUOYANG SUNRUI SPECIAL EQUIP
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