BÖHLER A930 is a stainless ferritic-austenitic steel of the 25%Cr type. Highest corrosion resistance and good strength properties. Good weldability, heat treatment after welding is not required.
Excellent resistance to general corrosion, stress corrosion cracking, vibration cracking, pitting and crevice corrosion as well as erosion corrosion.
Max. operating temperature for long-term use: 280°C (short-term exceeding up to 300°C permissible).
Required surface finish:pickled or machined.
BÖHLER A930 (UNS S32550, 1.4507, F61) is the original super duplex stainless steel. As such, it was the first alloy to be called “super duplex” and is based on a chromium content of 25 %. Compared to the later alternatives UNS S32750 and UNS S 32760, it is the only grade with an increased copper content for better pitting corrosion resistance.
Components in offshore, waste water, seawater desalination and chemical plants with aggressive chloride-containing media, e.g. heat exchangers, separator parts, compressor and pump components, turbine blades.
| Market grade | SEL | EN | UNS |
|---|---|---|---|
| F51 | 1.4507 | X2CrNiMoCuN25-6-3 | S32550 |
| EN ISO | ASTM | ASTM | ASTM |
|---|---|---|---|
| 10088-3 | A276/A276M | A182/A182M | A479/A479M |
| C | Si | Mn | P | S | Cr | Mo | Ni | Cu | N | |
|---|---|---|---|---|---|---|---|---|---|---|
| max. 0.04 | max. 1.00 | max. 1.50 | max. 0.040 | max. 0.030 | 24.0 to 27.0 | 2.9 to 3.9 | 4.5 to 6.5 | 1.50 to 2.50 | 0.10 to 0.25 |
