Super Duplex Stainless Steel F55 is a highly alloyed stainless steel designed for use in aggressive environments. High strength, toughness, excellent corrosion resistance and its resistance to corrosion in a wide range of organic and inorganic acids are just a few characteristics that make this duplex stainless steel attractive to a variety of industries. Lastly, it is highly resistant to strong alkalis and resists corrosion in many non-oxidizing acids.
Available Forms of Super Duplex F55 at Rooplaxmi Steels:
• Sheet
• Plate
• Bar
• Pipe & Tube (welded & seamless)
• Fittings
Characteristics of Super Duplex F55:
• Guaranteed corrosion performance (PREn ≥ 40)
• Excellent corrosion resistance in mineral acids such as hydrochloric and sulfuric
• High resistance to pitting and crevice corrosion
• Excellent resistance to stress corrosion cracking in both chloride and sour environments
• High resistance to erosion corrosion and corrosion fatigue
• Excellent mechanical properties
• Possibility for weight reduction over austenitic, standard duplex and nickel base alloys
• Good weldability
Super Duplex F55 Chemical Composition, %:
Cr |
Ni |
Mo |
C |
W |
Cu |
N |
Mn |
24.0-26.0 |
6.0-8.0 |
3.0-4.0 |
0.03 max |
0.5-1.0 |
0.5-1.0 |
0.2-0.3 |
1.0 max |
Si |
P |
S |
Fe |
1.0 max |
0.03 max |
0.01 max |
Balance |
Application of Super Duplex F55:
• Oil and gas industry applications
• Pollution control
• Pulp and paper
• Power generation
• Flue-gas desulfurization
• Chemical, pharmaceutical
• Desalination
• Mining and mineral industries
• Marine industries
Machining and Fabrication with Super Duplex F55:
Forging temperature for Super Duplex F55 should be 1100 – 1250oC Reheat as often as necessary and cool in still air. Anneal – Heat to 1100 – 1140oC ensuring sufficient time is allowed for the centre to achieve furnace temperature and hold for a time commensurate with the ruling section, followed by water quenching. Material in the annealed condition is readily machinable by all conventional methods. F55 is readily weldable using many of the standard electric arc welding processes but oxyacetylene welding is not recommended because carbon pickup in the weld metal may occur.
Super Duplex F55 ASTM Specification:
Pipe & Tube |
Sheet/Plate |
Bar |
A790, A928, |
A240 |
A276 |
Mechanical Properties of Super Duplex F55:
At Room Temperature, Solution Annealed Condition
Tensile Strength |
109 ksi |
Yield |
(0.2 % offset) |
Elongation (in 50 mm) |
25 % |
Rooplaxmi Steels is a leading Stockholder of Nickel Alloys, Hastelloy, Inconel, Monel, Nickel Copper alloys, Titanium, Cobalt alloys, Duplex, Stainless Steel and other Nickel based alloys in the form of round bars, plate, Sheet, strip, wire, pipe, pipe fittings and flanges.
Quality is our prime concern. We are able to maintain high quality standards through our committed personnel and sound infrastructure. We ensure that finest quality material is used for our products. For ensure the quality of each material, we are providing Materials Test Certificate along with supply. Our team of experts maintain a vigil on the quality of the products.