DUPLEX
| Grade | UNS | Chemical Composition(%) | Tensile Strength ( Mpa min) | Yield Strength ( Mpa min) | Reduction of Area ,min (%) | Elongation min(%) | Hardness (HRC) | ||||||
| F44 | S31254 | Ni | Cr | C | Fe | Mn | Si | S | 650 MPa min | 300 MPa min | … | 35% min | |
| 17.5-18.5 | 19.5-20.5 | 0.02max | Remainder | 1max | 0.8max | 0.01max | |||||||
| P | Cu | N | Mo | ||||||||||
| 0.03max | 0.5-1 | 0.18-0.22 | 6-6.5 | ||||||||||
| F51 | S31803 | Ni | Cr | C | Fe | Mn | Si | S | 620 MPa min | 450 MPa min | …. | 25% min | HRC 24.2max |
| 4.5-6.5 | 21-23 | 0.3max | Remainder | 2max | 1max | 0.02max | |||||||
| P | N | Mo | |||||||||||
| 0.03max | 0.08-0.2 | 2.5-3.5 | |||||||||||
| F53 | S32750 | Ni | P | Cr | Si | Fe | Mn | Mo | 795 MPa min | 550 MPa min | …. | 15% min | HRC 32max |
| 6.0-8.0 | 0.035 | 24-26 | 0.8max | Remainder | 1.2max | 3-5 | |||||||
| P | Cu | S | N | C | |||||||||
| 0.035max | 0.5max | 0.02max | 0.24-0.32 | 0.03max | |||||||||
| F55 | S32760 | Ni | C | P | Mn | W | S | Mo | 750 MPa min | 550 MPa min | 45% min | 25% min | |
| 6.0-8.0 | 0.03max | 0.03max | 1max | 0.5-1 | 0.01max | 3.0-4.0 | |||||||
| Si | Cu | Cr | N | ||||||||||
| 1.0max | 0.5max | 24.0-26.0 | 0.2-0.3 | ||||||||||
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