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Grade 4 combines the excellent resistance to corrosion and corrosion fatigue of titanium with high strength that makes it a candidate to compete with steels and nickel alloys for many chemical and marine applications. It could be considered in any application where strength and corrosion resistance are important. Grade 4 also has good ductility, is moderately formable, and has superior corrosion fatigue resistance in seawater. Applicable service temperatures for CP Ti Grade 4 are up to 204ºC (400ºF). Some applications have included airframe and aircraft engine components, marine and chemical processing machinery, heat exchangers, reaction vessels for chemical processing and desalinization plants, corrosive waste disposal wells and pulp and paper production.
| Weight % | C | H | Fe | N | O | Ti |
|---|---|---|---|---|---|---|
| minimum | — | — | — | — | — | Bal. |
| maximum | 0.10 | 0.015 | 0.50 | 0.050 | 0.40 |
| Characteristics | English | Metric | |
|---|---|---|---|
| Nominal density | 25°C / 78°F | 0.163 lbs/in3 | 4.51 g/cm3 |
| Melting point | 3020 °F | 1660 °C | |
| Specific heat | 25°C / 78°F | 0.127 BTU/lb- °F | 530 J/Kg- °K |
| Coefficient of thermal
expansion From 20°C to temperature |
100°C / 212°F | 4.78 µin/in- °F | 8.60 µm/m- °K |
| 315°C / 599°F | 5.11 µin/in- °F | 9.20 µm/m- °K | |
| 540°C /1000°F | 5.39 µin/in- °F | 9.70 µm/m- °K | |
| Thermal conductivity | 100-300°C
(212-572°F) |
9.95 BTU/ft- hr – °F | 17.2 W/m – °K |
| Electrical resistivity | 25°C / 78°F | 600 nΩ · m | |
| Treatment | Tensile | Hardness | |||||
|---|---|---|---|---|---|---|---|
| Ultimate | Yield | Elongation at break | Reduction of area | Rockwell B | |||
| KSI | MPa | KSI | MPa | % | % | ||
| Typical | 79.8 | 550 | 69.6-80.1 | 480-552 | 15.0 | 30.0 | 100 |
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