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X8CrNiS18 9 is an austenitic stainless steel that offers the most machinability then any other austenitic grade due to it’s inclusion of Sulphur in the composition. This does however lower the the corrosion resistance and toughness of this grade, though the toughness is still excellent as with other austenitic grades.
| Element | Min | Max |
|---|---|---|
| C (Carbon) | 0.1% | |
| Cr (Chromium) | 17% | 19% |
| Cu (Copper) | 1% | |
| Mn (Manganese) | 2% | |
| N (Nitrogen) | 0.1% | |
| Ni (Manganese) | 8% | 10% |
| P (Phosphorus) | 0.045% | |
| S (Sulphur) | 0.15% | 0.35% |
| Si (Silicon) | 1% |
| Mechanical Properties | Min | Max |
|---|---|---|
| Ultimate Tensile Strength (UTS) | 500 MPa | 750 MPa |
| 0.2% Proof Stress | 190 MPa | |
| 1.0% Proof Stress | 225 MPa | |
| Elongation | 35% | |
| Gauge Length | A80mm | |
| Hardness (Brinell) | 230 HB |
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