Excellent Corrosion Resistance Titanium is resistant to corrosive attack by salt water or marine atmospheres. It also exhibits exceptional resistance to a broad range of acids, alkalis, natural waters and chemicals. Superior Erosion Resistance Titanium offers superior resistance to erosion, cavitation or impingement attack. Titanium is at least twenty times more erosion resistant than the copper-nickel alloys. High Heat Transfer Efficiency Under "in service" conditions, the heat transfer properties of titanium approximate those of admiralty brass and copper-nickel. There are several reasons for this: Titanium's higher strength permits the use of thinner walled equipment. There appear to be unusual and beneficial characteristics in titanium's inherent oxide film. The relative absence of corrosion in media where titanium is generally used leaves the the surface bright for improved lamellar flow. Titanium's excellent erosion-corrosion resistance permits significantly higher operating velocities. Superior Strength-to-Weight Ratios The densities of titanium-based alloys range between .160 lb/in3 (4.43 gm/cm3) and .175 lb/in3 (4.85 gm/cm3). Yield strengths range from 25,000 psi (172 MPa) commercially pure (CP) Grade 1 to above 200,000 psi (1380 MPa) for heat treated beta alloys. The combination of high strength and low density results in exceptionally favorable strength-to-weight ratios for titanium-based alloys are superior to almost all other metals and become important in such diverse applications as deepwell tubestings in the petroleum industry and surgical implants in the medical field. Table 2 PHYSICAL PROPERTIES Property T (°F) T (°C) Value Value (Sl) Density 72 22 0.160 lb in-3 4.42 g cm-3 Beta Transus 1825 +/-25 996 +/-14     Melting (liquidus) Point 3000-3020+/-25 1650-1661+/-14     Thermal Conductivity Mil Annealed 68 600 1200 20 315 650 3.8 Btu hr-1ft-1 °F-1 6.1 Btu hr-1ft-1 °F-1 10.1 Btu hr-1ft-1 °F-1 6.6 W m-1K-1 10.6 W m-1K-1 17.5 W m-1K-1 Specific Heat 68 800 1600 20 425 870 0.140 Btu lb-1 °F-1 0.140 Btu lb-1 °F-1 0.140 Btu lb-1 °F-1 0.586 J kg-1K-1 0.586 J kg-1K-1 0.586 J kg-1K-1 Electtical Resistivity 32 600 1200 0 315 650 66 µ Ohm in 73 µ Ohm in 74 µ Ohm in 1.68 µ Ohm m 1.86 µ Ohm m 1.98 µ Ohm m Magnetic Permeability     1.00005 at 20 oersteds Mean Coefficient of Thermal Expansion 32-212 70-800 70-1200 0-100 20-425 20-650 5.0 X 10-6in in-1 °F-1 5.2 X 10-6in in-1 °F-1 5.4 X 10-6in in-1 °F-1 9.0 X 10-6m m-1 °C-1 9.4 X 10-6m m-1 °C-1 9.7 X 10-6m m-1 °C-1 Young's Modulus (Dependent on texture and heat treatment) 68 450 20 230 15.5-17.7 Msi 13.8-16.2 Msi 107-122 GPa 95-111 GPa Shear Modulus 68 20 5.9-6.5 Msi 41-45 GPa Poisson's Ratio 68 20 .31 .31 Table 3 MINIMUM TENSILE PROPERTIES OF TIMETAL 6-4 Product (in) Condition Specification Dir. Temperature °F (°C) UTS ksi (MPa) 0.2% YS ksi (MPa) Elongation % Reduction in Area % 0.025-1.000 Sheet & Plate Annealeda ASTM B265 L & LT 68(20) 130(895) 120(828) 10b - </-3.00 RD or Thk. Annealed ASTM B348 L 68(20) 130(895) 120(828) 10 25 </-4.00 RD or Thk. >4.00-6.00 Annealed Annealed Mil-T-9047Gc Mil-T-9047Gc All All 68(20) 68(20) 130(896) 130(896) 120(827) 120(827) 10 10 25 20 ><0.500 >0.500-1.000 >1.000-1.500 >1.500-2.000 >2.000-3.000 >STDd STDd STDd rd,. sq,. hex rd,. sq,. hex Mil-T-9047G Mil-T-9047G Mil-T-9047G Mil-T-9047G Mil-T-9047G   68(20) 68(20) 68(20) 68(20) 68(20) 165(1137) 160(1103) 155(1068) 150(1034) 140(965) 155(1068) 150(1034) 145(999) 140(965) 130(896) 10 10 10 10 10 20 20 20 20 20 MINIMUM TENSILE PROPERTIES OF TIMETAL 6-4 ELI 0.025-1.000 Sheet & Plate ST ASTM B265 L & LT 68(20) 120(828) 110(759) 10 - </-3.00 RD or Thk. Annealed ASTM B348 L 68(20) 120(828) 110(759) 10 25 ></-1.75 RD or Thk. 1.75-2.50 2.50-4.00 Annealedd Annealedd Annealedd ASTM F136 ASTM F136 ASTM F136 L L & LT L, LT & ST 68(120) 68(120) 68(120) 125(860) 120(825) 120(825) 115(795) 110(760) 110(760) 10 8 8 25e 20 15 a 1300°F/1hr/AC or slower. b For materials less than .025 thick, the elongation must be negotiated with the manufacturer. c Partial list of tensile requirements from the specification. d Solution Treat and Age (1650-1775°F)/2-120 min/WQ + 900-1275°F/2-8hr/AC e Only for 0.187-<1.75? thick material. Table 1 CHEMICAL COMPOSITION   TIMETAL 6-4 ASTM Grade 5 Mil T-9047 TIMETAL 6-4 ELI ASTM Grade 23 AMS 4981 TIMETAL 6-4-.1Ru ASTM Grade 29   Min. Max. Min. Max. Min. Max. Aluminum 5.5 6.75 5.5 6.5 5.5 6.5 Vanadium 3.5 4.5 3.5 4.5 3.5 4.5 Nitrogen - 0.05 - 0.03 - 0.03 Carbon - 0.08 - 0.08 - 0.08 Oxygen - 0.20 - 0.13 - 0.13 Iron - 0.40 - 0.25 - 0.25 Hydrogen - 0.015 - 0.0125 - 0.015 Ruthenium - - - - 0.08 0.14 Residual Element, each - 0.1 - 0.1 - 0.1 Residual Element, total - 0.40 - 0.40 - 0.40