Alloy element | ASTM F-138 standard Range (%wt) | Uncorroded screw (%wt) | Corroded screw (%wt) |
Cr | Min 17.00; Max 19.00 ± 0.20 | 14.808 | 25.779 |
Ni | Min 13.00; Max 15.00 ± 0.15 | 9.144 | 15.496 |
Mo | Min 2.25; Max 3.00 ± 0.10 | 1.765 | 3.154 |
Mn | Max 2.00 ± 0.04 | 0.979 | 1.922 |
Co | - | 0.188 | 0.276 |
Cu | Max 0.50 ± 0.03 | 0.240 | 0.738 |
Ti | - | 0.006 | 0.009 |
C | Max 0.030 ± 0.005 |
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Si | Max 0.75 ± 0.05 |
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N | Max 0.10 ± 0.01 |
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P | Max 0.025 ± 0.005 |
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S | Max 0.010 ± 0.005 |
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PRE = %Cr + 3.3 * % Mo | PRE ≥ 26 | 20.632 | 36.187 |