TITANIUM ALLOY
Ti - 3Al - 8V - 6Cr - 4Mo - 4Zr - 0.05Pd (Ti Beta-C™/Pd)
ASTM GRADE (UNS NO.)
GRADE 20 (R58645)
Chemical Composition (wt. %)
(Max. values unless range is shown) 		3.0-4.0Al; 7.5-8.5V; 5.5-6.5Cr; 3.5-4.5Zr; 3.5-4.5Mo; 0.3Fe; 0.12O; 0.05C; 0.04-0.08Pd; 0.03N; 0.02H
TENSILE PROPERTIES
Guar. R.T. Min.
Typical Elevated Temp. Prop. (STA)
(S.T.)
 (STA)
R.T.
93°C(200°F)
 204°C(400°F)
315°C(600°F)
Ultimate Strength
MPa (ksi)
793 (115)
1172 (170)
1227 (178)
1172 (170)
1117 (162)
1069 (155)
Yield Strength,
0.2% offset
MPa (ksi)
759 (110)
1103 (160)
1138 (165)
1069 (155)
1007 (146)
972 (141)
Elongation in 51 mm
(2") gage length
(%)
15
6
9
9
9
9
Reduction in Area -
Bar, Billet & Forging only
(%)
—
—
30
35
32
30
OTHER MECHANICAL PROPERTIES
 

Stress to Rupture
in Time Shown

Stress
MPa (ksi)
1020 (148)
965 (140)
Time-Hrs. at Temp. (°C)
500 (260)
100 (315)
Stress & Time to
Produce Elongation
Shown (creep)
Stress
MPa (ksi)
952 (138)
670 (100)
517 (75)
Time-Hrs. at Temp. (°C)
750 (260)
100 (315)
170 (370)
Creep
(%)
0.2
0.2
0.2
Charpy V-Notch
Impact @ R.T.
Joules
(ft-lbs)
10.8 - 16.3 (8 - 12)
Bend Radius Under 1.78 mm (0.070") thick
3.5 (ST)
1.78 mm (0.070") and over
4.0 (ST)
Welded Bend Radius
—
Nominal Hardness
30 - 45 HRC
PHYSICAL PROPERTIES
  
Nominal Beta
Transus
°C (°F)
730 (1350)
Coefficient of
Thermal Expansion
10-6/°C
(10-6/°F) 		0-100°C (32 -212°F)
8.3 (4.6)
0-315°C (32-600°F)
9.5 (5.3)
0-538°C (32-1000°F)
9.7 (5.4)
0-648°C (32-1200°F)
—
0-816°C (32-1500°F)
—
Density
g/cm3 (lbs/in3)
4.82 (0.174)
Melting
Point,
Approx.
°C (°F)
1650 (3000)
Electrical
Resistivity
@ R.T.
10-6 ohm·cm
(10-6 ohm·in)
160 (63)
Modulus of
Elasticity ­
Tension
GPa (103 ksi)
ST: 93-96 (13.5-14.0); STA: 102 (14.8)
Modulus of
Elasticity ­
Torsion
GPa (103 ksi)
41.4 (6.0)
Thermal
Conductivity
W/m·°C (BTU/hr·ft·°F)
6.2 (3.6)
Specific
Heat
J/Kg·°C (BTU/lb·°F)
515 (0.123)
Weldability
Fair
Industry Specifications
ASTM B265, B337, B348, B363, B381 and B861