Typical Room Temperature Mechanical Properties of Tantalum and Its Alloys

Tantalum

Ta2.5W

Ta10W

Ta40Nb

Ultimate Tensile Strength, MP a (KSI)

276 (40)

379 (55)

620 (90)

310 (45)

Yield Strength, MP a (KSI)

172 (25)

241 (35)

482 (70)

207 (30)

% Elongation

50

30

30

40

Modulus of elasticity 103MPa (psi x 106)
... at room temp
... at 750°C

179 (26)

179 (26)

207 (30)
152 (22)

152 (22)

Rockwell B hardness

35

55

90

35

Mechanical Properties for Plate, Sheet and Strip, Annealed Condition
(90% minimum recrystallized)

Grade and Form

Ultimate Tensile Strength
min, psi (MP a)

Yield Strength
min, psi (MP a)
(2% Offset)

Elongation
min %
(1 in. gauge length)

Unalloyed tantalum (R05200, R05400)
Plate, sheet and strip
<0.060 in. thick
>0.060 in. thick

30,000 (207)
25,000 (172)

20,000 (138)
15,000 (103)

20
30

90% tantalum, 10% tungsten (R05255)
Sheet and Strip
Plate

70,000 (482)
70,000 (482)

60,000 (414)
55,000 (379)

15
20

97.5% tantalum, 2.5% tungsten (R05252)
Sheet and Strip
Plate > 0.187 in. (4.7 mm)

40,000 (276)
40,000 (276)

30,000 (207)
22,000 (152)

20
20

60% tantalum, 40% niobium (R05240)
Plate, Sheet and Strip
<0.060 in. thick
>0.060 in. thick

40,000 (276)
35,000 (241)

20,000 (138)
15,000 (103)

20

Mechanical Properties for Rod and Wire, Annealed Condition

ROD
0.125 in. (3.18 mm) to 2.5 in. (63.5mm) Diameter

Ultimate Tensile Strength
min., psi (MPa)

Yield Strength
min., psi (MPa)

Elongation
min., %*

Unalloyed tantalum (R05200 and R05400)
97.5% tantalum 2.5% tungsten (R05252)
90% tantalum 10% tungsten (R05255)
60% tantalum 40% niobium (R05240)

25,000 (172)
40,000 (276)
70,000 (482)
35,000 (241)

15,000 (103)
20,000 (138)
55,000 (379)
15,000 (103)

25
20
20
25

WIRE
0.010 in. (0.254 mm) to 0.124 in. (3.14 mm) Diameter

Diameter
inches (mm)

Ultimate Tensile Strength
min., psi (MPa)

Elongation
min., %*

Unalloyed tantalum (R05200 and R05400)

0.010 (0.254) to 0.0149 (0.379)
0.015 (0.381) to 0.0249 (0.633)
0.025 (0.635) to 0.1240 (3.140)

35,000 (241)
35,000 (241)
30,000 (207)

10
15
20

97.5% tantalum 2.5% tungsten (R05252)

0.010 (0.254) to 0.0149 (0.379)
0.015 (0.381) to 0.0249 (0.633)
0.025 (0.635) to 0.1240 (3.140)

40,000 (276)
40,000 (276)
40,000 (276)

5
10
15

90% tantalum 10% tungsten (R05255)

0.030 (0.762) to 0.1240 (3.140)

70,000 (482)

15

60% tantalum 40% niobium (R05240)

0.010 (0.254) to 0.0149 (0.379)
0.015 (0.381) to 0.0249 (0.633)
0.025 (0.635) to 0.1240 (3.140)

40,000 (276)
40,000 (276)
40,000 (276)

10
15
20

* 10 in. (254 mm) gauge length to 0.050 in. (1.27 mm) diameter and 1 in. (25.4 mm) or 2 in. (50.8 mm) gauge
Length over 0.050 in. (1.27 mm) diameter