F61 (UNS S32550 / W.Nr. 1.4507)
F61 (UNS S32550 / W.Nr. 1.4507) steel compared with F53 and F55 steels it delivers increased strength and corrosion performance. Its minimum yield strength exceeds 550Mpa, whereas other grades are limited to 550Mpa. In addition, it contains up to 2.0% of copper, which aids pitting corrosion resistance.
Equivalent Grades
| Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
| F61 | – | – | F61 | S32550 | X2CrNiMoCuN25-6-3 | 1.4507 | – | – | – | 2205 |
Chemical Composition, %
| Alloy | C | Si | Mn | P | S | Cr | Ni | Mo | N | Cu | Fe |
| F61 | ≤0.04 | ≤1.0 | ≤1.5 | ≤0.04 | ≤0.03 | 24.0-27.0 | 4.5-6.5 | 2.9-3.9 | 0.1-0.25 | 1.5-2.5 | Bal |
Typical Physical and Mechanical Properties (RT, Annealed)
| Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HRB |
| 8.0 | 1030-1130 | ≥750 | ≥550 | 25 | / |
Available Products and Specifications
| Rod, Bar, Wire and Forgings | ASTM A182 |
| Plate, Sheet and Strip | ASTM A312 |
| Pipe and Tube | ASTM A167, 240 |
| Welding Product | – |
| Others | ASTM A403 |
Features
High performance 25% chromium super duplex (austenitic/ferritic) steel with 1.75% copper. Good strength/ductility combinedwith high resistance to all forms of corrosion.
Applications
F61 steel is widely used in the following applications:
- Pumps
- Valves
- Chokes
- Bolting
- Pipework/flanges
- Connectors and manifolds
- Oil and gas industry
- Equipment in defence, chemical and marine industries
