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904L
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F55
PH 13-8
Haynes-230
Nickel 200
Cr20Ni80
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Nickel Alloy Powder
F55 UNS S32670/W.Nr 1.4501 super duplex stainless steel
overview
Stainless steel grade F55 has excellent corrosion resistance to a wide range of areas, especially resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with critical pitting temperature that is more than 50°C (122°F). This material is known to also have high strength and extended lifecycle. It is 10% lighter than grade 316 steel, ideal for sub-zero service, and more cost effective than nickel alloys. Stainless steel grade F55 can be easily machined and welded.
Limiting Chemical Composition, %
Iron.............................................................................................................................................................................................Balance
Chromium......................................................................................................................................................................................26.00
Nickel................................................................................................................................................................................................8.00
Molybdenum.....................................................................................................................................................................................4.00
Manganese.......................................................................................................................................................................................1.00
Silicon................................................................................................................................................................................................1.00
Copper...............................................................................................................................................................................................1.00
Tungsten............................................................................................................................................................................................1.00
Nitrogen.....................................................................................................................................................................................0.30 max.
Carbon........................................................................................................................................................................................0.03 max.
Sulfur.........................................................................................................................................................................................0.015 max.
Phosphorous.............................................................................................................................................................................0.035 max.
Physical Constants
Below are some physical constants and thermal properties of
Density |
g/cm³....................................................................................................7.8 |
Electr. Resistance at 20°C |
Ω mm2 /m............................................................................................0.8 |
Thermal conductivity at 20°C |
W/m K...................................................................................................15 |
Specific heat capacity at 20°C |
J/kg K...........................................................................................480-500 |
Mechanical properties
Ultimate Tensile Strength |
730 – 930 MPa |
0.2% Proof Strength |
530 MPa |
Elongation |
25 % |
Hardness (Max) |
290 HB |
Impact |
100 J |
Corrosion Resistance
Stainless steel F55 has a very good corrosion resistance. Use in media causing pitting or stress corrosion cracking is possible because tungsten increases pitting resistance. The PREN values (chromium sum) can be> 40 according to the chemical analysis.
Heat Treatment
The heat treatment of the Stainless steel F55 is carried out by solution annealing in the range 1040-1120°C with rapid cooling in sufficient water and this is also recommended after welding larger cross sections.
WELDING
The steel 1.4501 is weldable with all processes (TIG welding, MAG solid wire, arc welding, submerged arc welding). The exception is gas-melt welding! There is a risk of intermetallic compounds. Welding consumables, predominantly similar electrodes, should be used in welding, as they increase elongation properties at high temperatures. However, a change in the corrosion properties is to be expected in the area where the weld took place (heat-affected zone).
Available Forms
We provide you with a variety of product forms, including but not limited to
● Bar & Rod
● Pipe & Tube
● Coil & Strip
● Plate & Sheet & Circle
● Wire & Welding
● Fitting (Flange, Elbow, Tee...)
● Customize
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