Portuguese
Sales hotline: +44 (0)1782 610250
Contact us on sales@langleyalloys.com to request a quote
Portuguese
Contact us on sales@langleyalloys.com to request a quote
Portuguese
Sales hotline: +44 (0)1782 610250
Ferralium® 255 – SD50 (super duplex 255) is a super duplex stainless steel supplied in the hot worked and annealed condition. It achieves higher strengths than most stainless steels and 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 copper, Ferralium® 255 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 01 75 for sour service and having gained ASME Approval for Pressure Vessel applications, Ferralium® 255-SD50 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.
| Cr | Ni | Mo | Co | Nb (+Ta) | Ti | V | W | Cu | C | Mn | N | Si | P | S | Fe | Al | |
| Min | 24.50 | 5.50 | 3.10 | 1.50 | 0.80 | 0.20 | |||||||||||
| Max | 26.50 | 6.50 | 3.80 | 2.00 | 0.025 | 1.20 | 0.25 | 0.70 | 0.025 | 0.005 | Balance |
| Bars up to and including 4.0” (100mm) diameter or section | Bars greater than 4.0” (100mm) and up to 12.0” (300mm) diameter or section | Bars greater than 12.0” (300mm) diameter or section | ||||
| 0.2% Proof Stress | 586 N/mm2 | 85ksi | 586 N/mm2 | 85ksi | 570 N/mm2 | 83ksi |
| Tensile Strength | 790 N/mm2 | 114.5ksi | 790 N/mm2 | 114.5ksi | 760 N/mm2 | 110ksi |
| Elongation, 5.65√S0 and 4D | 25% | 25% | 25% | |||
| Reduction of Area | 50% | 50% | 50% | |||
| Hardness (Brinell) | 220-270 | 220-270 | 220-270 | |||
| Impact Strength (Room Temp) | 80J | 59 ft.lb | 80J | 59 ft.lb | 80J | 59 ft.lb |
| Impact Strength (-46degC) | 45J av (35J min) | 33 ft.lb av (25.8 ft.lb min) | 45J av (35J min) | 33 ft.lb av (25.8 ft.lb min) | 45J av (35J min) | 33 ft.lb av (25.8 ft.lb min) |
| Density (Kg/m3) | 7810 |
| 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 |
| Fracture Toughness, KQ (MPa/m2) | 98 |
Worldwide Delivery Available
We can offer air, sea and road freight shipping options, with choice of packaging, to deliver to customers globally.
Inventory Management
Let us manage your total material requirements with call-off and consignment arrangements.
Up to 40 sizes per alloy available
More sizes equal less machining and a more cost-effective supply chain.
