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UT-18 VAC-ARC is a medium-carbon, low-alloy heat resistant steel having high strength to 1000°F. It is used primarily for turbine and compressor rotor shafts. Vacuum consumable electrode melting is employed to provide a preferred ingot solidification and superior micro-cleanliness.
| Weight % | C | Mn | Si | Cr | Mo | V | Fe |
|---|---|---|---|---|---|---|---|
| Typical
Analysis |
0.40 | 0.60 | 0.25 | 3.25 | 1.00 | 0.20 | Reminder |
| Tensile | ||||||||
|---|---|---|---|---|---|---|---|---|
| Typical Longitudinal Properties at room temperture | Ultimate | Yield | Elongation | Reduction in Area | Izod V-Notch impact Value | |||
| Bar/Billet size:
inch (cm) |
KSI | MPa | KSI | MPa | % | % | ft*lb | joule |
| 1 1/4” (3.2) | 202 | 1393 | 168 | 1158 | 17.5 | 64.5 | 38 | 51.5 |
| 203 | 1400 | 168 | 1158 | 17.0 | 63.5 | 35 | 47.5 | |
| 1 3/4” (4.5) | 206 | 1420 | 172 | 1186 | 17.5 | 62.0 | 30 | 40.7 |
| 204 | 1407 | 170 | 1172 | 17.5 | 63.0 | 31 | 42.0 | |
| 2 1/8” (5.4) | 208 | 1434 | 173 | 1193 | 16.5 | 61.0 | 27 | 36.6 |
| 203 | 1400 | 170 | 1172 | 16.0 | 60.0 | 26 | 35.3 | |
| 3 1/4” (8.3) | 206 | 1420 | 170 | 1172 | 16.0 | 61.5 | 30 | 40.7 |
| 205 | 1413 | 171 | 1179 | 17.0 | 61.0 | 28 | 38.0 | |
| 3 3/4” (9.5) | 203 | 1400 | 170 | 1172 | 16.5 | 62.0 | 29 | 39.3 |
| 204 | 1407 | 169 | 1165 | 17.0 | 61.5 | 28 | 38.0 | |
| 4” (10.2) | 204 | 1407 | 166 | 1145 | 17.0 | 62.0 | 41 | 55.6 |
| 206 | 1420 | 170 | 1172 | 17.0 | 64.0 | 43 | 58.3 | |
| 6” (15.2) | 205 | 1413 | 172 | 1186 | 16.0 | 60.0 | 25 | 33.9 |
| 205 | 1413 | 170 | 1172 | 16.0 | 59.0 | 28 | 38.0 | |
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