Stainless steel copper brazing

---

Oxygen-free copper with purity over 99% is often used to braze stainless steel in hydrogen furnace, ammonia decomposition furnace and vacuum furnace. The melting point of copper brazing filler metal is 1083℃, and the brazing temperature is 1120℃. The wettability and fluidity of copper on stainless steel are very good, and the gap between brazing seams is generally controlled at 0-0.05 mm. Copper brazing filler metal has low cost and can be made into various forms of wire, tape, foil and powder. Brazed joints have good strength and plasticity at room temperature, but the strength and oxidation resistance of brazed joints decrease sharply above 400℃.

Cu-31.5Mn-10Co brazing filler metal is often used to braze stainless steel in protective atmosphere. The melting range of the filler metal is 940-950℃ and the brazing temperature is 1000-1050℃. The stainless steel joints brazed by the filler metal can still maintain high strength and oxidation resistance at about 500℃. Because the brazing temperature is consistent with the solution temperature of some stainless steel, the brazing of stainless steel can be carried out together with heat treatment.

Cu-30Ni-2Si-02B-15Fe brazing filler metals are commonly used for brazing stainless steel in furnaces, especially in vacuum furnaces. The stainless steel joints brazed with the brazing filler metal have better high temperature properties. The strength and oxidation resistance of the brazing filler metal at 600℃ are similar to those of 1Cr18Ni9Ti. However, the solder has a high melting point, the melting range is 1080-1120℃, and the brazing temperature is 1175-1200℃. Brazing stainless steel at such a high temperature will result in grain growth of stainless steel.

Shear strength of Cr13 brazed joint at different temperatures:

solders	Test temperature
	room temperature	427	538	649
Cu-31.5Mn-10Co	415	317	221	104
Bau-4	441	276	217	149
Ag-21Cu-25Pd	299	207	141	100

 

SIMUWU Vacuum Technology Co., Ltd. was established in 2007. It is a high-tech joint-stock company specializing in research, design, manufacture and sales of vacuum furnace equipment. The company not only provides excellent vacuum furnace equipment, but also provides vacuum brazing service. It has rich welding experience for stainless steel, cemented carbide, copper, diamond, ceramics, aluminium and so on. In terms of products, we have mature welding experience for honeycomb radiator, EGR cooler, intercooler, oil cooler, aluminum cooling plate, flat antenna, diamond grinding head, stainless steel flowmeter, etc. Welcome to consult.

SIMUWU Vacuum Technology Co., Ltd. vacuum furnace products have passed ISO-9001 quality system certification. The company keeps its promise to win reputation by quality and build brand by reputation.

Learn More : Vacuum Brazing Furnace