With a combination of good formability and high post-braze strength, FA7911 is highly suitable for the use in headers and plates. The defined composition of silicon and magnesium makes FA7911 easy to braze in the CAB process, while showing good ageing behaviour after brazing. The addition of titanium to the product also enables very good corrosion resistance. In typical header and plate dimensions it easily exceeds 60 days of SWAAT life without perforations.
Grain structure after brazing.
Delivery condition temper and properties
Typical strength and corrosion potentail after brazing
* As brazed
** After brazing with cooling at minium 1 °C/s and of 14 days ageing at 120 °C
Plate of FA7911 in 1.5 mm after 40 days SWAAT-testing.
FA7911 exhibits excellent corrosion performance with lateral corrosion behavior in SWAAT (ASTM G85). The corrosion attack is proceeding horizontally and prolonging the time to perforation. The addition of titanium improves the corrosion behavior of the bulk material by hindering pitting corrosion.
Typical strength after brazing and artificial ageing
Post braze mechanical properties after ageing at 90 °C and 120 °C. FA7911 is an age hardening alloy, and the strength will increase upon artificial ageing. After 14 days of ageing at 90 °C the yield strength typically increases 15 MPa and the tensile strength typically increases 20 MPa.
Environmental product declaration
Gränges aims to produce and supply our products in line with a long-term sustainability perspective, and we make every effort possible to reduce our environmental impact. The average environmental impact of every tonne aluminium strips produced is presented by Environmental Product Declaration (EPD), which covers the impact of raw materials and manufacturing process at our site. For a detailed EPD, please visit: www.granges.com.
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