Stainless steel pipe fittings are suitable for commercial 'water supply system' pipes

The wide application of stainless steel pipe fittings in engineering provides key technical support, and can be used to connect stainless steel pipes in household, commercial, and water supply systems. The design pressure value and actual working pressure value of our country's stainless steel pipe fittings; the appearance performance, corrosion performance, joint filling performance and process performance of the flux are in line with national standards. The stainless steel pipe fittings are brazed by the soft soldering method, but the flux activity is always not up to the requirement. Based on the research on the flux mechanism and reaction law of active ingredients, the aim is to develop a flux formula that can be used with stainless steel pipe fittings and smoothly realize low temperature brazing (300°C) of stainless steel pipe fittings. The reaction between the oxide film on the surface of stainless steel pipe fittings and the flux and its removal mechanism were discussed in detail. The mechanical properties of stainless steel pipe fittings and the physical and chemical properties of the flux were tested and evaluated.