Products
Iron-based stainless brazing filler metals
Höganäs' iron-based stainless brazing filler metals are a cost-effective alternative to the nickel-based brazing filler materials, and they possess similar material properties such as strength and corrosion resistance while not being vulnerable to fluctuating nickel prices.
Our iron-based stainless brazing filler metals are particularly popular for applications where conventional copper-brazing is replaced with stainless-steel brazing. This includes applications such as oil coolers and brazed plate heat exchangers (BPHE), where there is a need to keep copper contents at a minimum level in the end application. In high-temperature and corrosive environments, leaching of copper into the engine oil in an oil cooler or into the fluid in a brazed plate heat exchanger can occur. For oil coolers this is generally unwanted as it affects the performance and lifetime of the cooling system.
For brazed components for drinking water applications, stringent regulations are in place to limit the maximum permissible copper ion contents in the water, which drives the requirement to use other brazing filler metals. Iron-based stainless brazing filler metals have shown a particular technical advantage with low or insignificant amounts of metal ion leaching to drinking water, outperforming both the conventional nickel-based brazing filler metals and copper-brazing.
BrazeLet® F300 and BrazeLet F86 are iron-based stainless brazing filler metals, with good wetting properties on stainless steel base materials in vacuum or protective atmospheres. The high levels of alloyed chromium (Cr) results in superior hot gas and acid corrosion resistance, which makes the alloys suitable for brazing of applications such as heat exchangers, stainless oil coolers for commercial vehicles and exhaust gas recirculation coolers. The main differences between the two alloys is found in the brazed joint strength and the recommended brazing temperature, where BrazeLet F86 offers higher strength than BrazeLet F300, but requires somewhat higher brazing temperatures.
In addition to our standard iron-based stainless steel brazing filler metals, Höganäs also have full capabilities and experience to develop customer-specific alloys in cooperation with our customers if required by the application. Please do not hesitate do contact us, should you see the need for a brazing filler metal with different properties than the existing product portfolio.
BrazeLet® Fe-based brazing filler metals
BrazeLet F300-20
Iron-based brazing alloy
The nickel-based brazing alloy BrazeLet BNi9 provides high strength joints when brazing stainless steel materials in vacuum or protective atmospheres (dry hydrogen or argon). The brazing alloy is typically used for brazing nickel-based superalloys and stainless steel components where high elevated temperature strength is important, such as gas turbines and solid-oxide fuel cells. It is well suited for repair brazing and diffusion brazing as B readily diffuses into the base materials leaving a ductile Ni-Cr matrix in the joint.
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Nominal composition: Fe – 20Ni – 20Cr – 7P – 6.5Cu – 4Si |
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BrazeLet F300DW-9007
BrazeLet F300DW-9201
BrazeLet F300P-9012
BrazeLet F300R-8501
BrazeLet F300R-9003
BrazeLet F86
Iron-based brazing alloy
Höganäs’ unique iron-chromium based stainless brazing alloy BrazeLet F86 provides high strength joints when brazing stainless steel materials in vacuum or protective atmospheres (dry hydrogen or argon). The brazing alloy is particularly well suited for brazing heat exchangers with strict requirements on corrosion resistance and metal ion leaching, for example in drinking water or purified water applications, and it is completely copper free. Compared to nickel-based brazing alloys it offers a more attractive and stable cost. Compared to most of the standard nickel-based brazing alloys, BrazeLet F86 is able to fill larger gaps without brittle phase lines or cracks, which leads to a more reliable and safe brazing as well as more flexibility in part tolerances.
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Nominal composition: Fe – 29Cr – 18Ni – 6.5Si – 6P – 0.5Nb |
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