Ferralium® 255 is a super duplex stainless steel supplied in the hot worked, annealed and pickled condition. It achieves higher strengths than other alternative corrosion resistant alloys, offering the potential to reduce section size and therefore weight and cost.
As a 25% Cr alloy, with significant additions of Cu, it offers excellent corrosion resistance in a wide variety of corrosive chemicals including sulphuric, nitric and phosphoric acid. In seawater and other chloride containing environments it also provides outstanding resistance to pitting and crevice corrosion, with Critical Pitting Temperature exceeding 50°C. Excellent ductility and impact strength at both ambient and sub-zero temperatures combine with a high resistance to abrasion, erosion and cavitation erosion.
Listed in NACE MR 0175 for sour service and having gained ASME Approval for Pressure Vessel applications, Ferralium® 255 is tested to the highest degree using tests designed to guarantee that the trade-marked product possesses high integrity, a correct phase balance and the absence of sigma and other deleterious phases.
|For plates up to 3” in thickness|
|0.2% Proof Stress||550 N/mm2||79.8 ksi|
|Tensile Strength||790 N/mm2||114.5ksi|
|Elongation, 5.65√S0 and 4D||25%|
|Reduction of Area||50%|
|Impact Strength (Room Temp)||80J||59 ft.lb|
|Magnetic Permeability (20°C)||33|
|Young’s Modulus (kN/mm2)||199|
|Specific Electrical Resistance, 20°C (Ω-m)||0.80 x 10-6|
|Mean coefficient of thermal expansion, 20-100°C (m/m/degC)||11.1 x 10-6|
|Specific Heat, 20°C (J/kg.K)||475|
|Thermal conductivity, 20°C (W/m.K)||14.2|