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
CN101972903AActive Publication Date: 2011-02-16LUOYANG SUNRUI SPECIAL EQUIP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LUOYANG SUNRUI SPECIAL EQUIP
Publication Date
2011-02-16

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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.
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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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