Ferrarum? 255 is a 25% Cr alloy with significantly added copper, which has excellent corrosion resistance in various corrosive chemicals. This includes sulfuric acid, nitric acid and phosphoric acid. Fe-Al alloy 255 contains 2% copper, which is higher than other super duplex stainless steels. Therefore, Fe-Al alloy 255 has better acid resistance than most other alloys.
However, Ferralium 255 is not only booming in the oil, gas and chemical industries. Fe-Al alloy 255 also has excellent pitting and crevice corrosion resistance in seawater and other chloride-rich environments, and is an excellent material for marine environment. There are several contributing factors to this resistance. The first reason is that the critical corrosion temperature of Fe-Al alloy 255 exceeds 50°c, and at the same time, Fe-Al alloy 255 has excellent ductility and impact strength at normal temperature and below zero temperature. These, together with high wear resistance, corrosion resistance and cavitation resistance, ensure excellent wear resistance.
Fe-Al alloy 255 is listed in NACE MR 0 1 75 and used in acidic environment. Ferrarium 255-SD50 has obtained ASME pressure vessel application certification, and its height has passed the test, in order to ensure that the brand products have high integrity, correct phase balance and no σ and other harmful phases. Compared with other super duplex stainless steels, Fe-Al alloy 255 is less sensitive to the formation of these harmful phases.
Since Langley Alloy Company first developed and obtained the patent in1960s, Fe-Al alloy 255 has been successfully used in some of the most demanding applications in the world. The yield strength is more than 85ksi, and it is still the super dual-phase steel with the highest strength among solid bars. It can also be provided under the condition of aging and fastener grade.
Chemical composition of Fe-Al alloy 255:
Mechanical properties of 255 aluminum alloy:
Notes on Fe-Al alloy 255:
The test shall be conducted according to ASTM A370 or ISO 6892-65438 standard +0 (tensile) and ISO 6506-65438 standard +0 (hardness).
Minimum performance quotation (longitudinal test at room temperature)
Test the melt of each material in each batch of heat treatment.
The hardness shall conform to NACE MR 1075, and the maximum HRC value is 28 (270HB).
The corrosion test (50°C) showed no pitting, and
The ferrite content is 35-55%
The microstructure is proved to be free of grain boundary carbide, σ phase, χ phase and laves phase.