UNS S31254
All of our 6Mo materials are manufactured by qualified suppliers who meet the standards of Norsok M-650 Ed.4 and/or ISO 17782. The 6Mo super austenitic steel offers a balanced combination of moderate tensile strength, high ductility, and exceptional corrosion resistance in both seawater and various industrial environments. With a typical PREN (Pitting Resistance Equivalent number) ranging from 42 to 44, it provides a high level of resistance against pitting corrosion, as well as excellent resistance to crevice corrosion.
Chemical Composition Limits
| Weight % | C | Mn | P | S | Si | Cr | Ni | Mo | Â N | Â Cu | Â PREN |
| Min | – | – | – | – | – | Â 19.50 | Â 17.50 | Â 6.00 | Â 0.18 | Â 0.50 | Â 40 |
| Max | Â 0.020 | Â 1.00 | Â 0.030 | Â 0.010 | Â 0.70 | Â 20.50 | Â 18.50 | Â 6.50 | Â 0.22 | Â 1.00 | – |
Mechanical Properties
|  | Yield strength Rp0.2, MPa | Yield strength Rp1.0, MPa | Tensile strength Rm, MPa | Elongation [%] | Hardness [HB] |
| PLATE CR (COIL) | ≥ 320 | ≥ 350 |  690-850 | ≥ 35 | ≤ 223 |
| PLATE HR (COIL) | ≥ 310 | ≥ 340 |  655-850 | ≥ 35 | ≤ 223 |
| PLATE (QUARTO) | ≥ 310 | ≥ 340 |  655-850 | ≥ 40 | ≤ 223 |
| BAR | ≥ 300 | – | ≥ 650 | ≥ 35 | ≤ 321 |