Stainless steel brazing alloys and brazing joints
A cost-effective stainless steel brazing alloy with Zn, Ag, P, and Al composition addresses the challenge of wetting and spreading issues on stainless steel surfaces, providing reliable and efficient brazing joints between stainless steel and copper pipes.
Patent Information
- Application Number
- JP2025576014
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-06-28
- Filing Date
- 2023-12-19
- Publication Date
- 2026-07-10
AI Technical Summary
Existing brazing technologies face challenges in effectively joining stainless steel pipes due to the formation of a thin Cr-based oxide layer that prevents molten insert metals from wetting and spreading, leading to difficult brazing and high costs when using expensive alternatives like Ag-based alloys.
A stainless steel brazing alloy comprising Zn: 36-42%, Ag: 3-6%, P: 0.2% or less, Al: 0.01-0.3%, with the remainder being Cu and other unavoidable impurities, which enhances wetting and spreading on stainless steel surfaces, improving brazing properties and joint strength while being cost-effective.
The alloy achieves good wire drawing properties and excellent brazing performance with a wetting angle of 120° or more, ensuring reliable brazed joints between stainless steel and copper pipes, while maintaining affordability.