TANTALUM PRODUCTS SERIES

CHEMICAL PROPERTIES for Tantalum
Type

ASTM B364, B365, B521, B708 standards Impurities(%), max.
Nb C O N H Fe Ni W Mo Si Ti
Ta-1 0.05 0.01 0.02 0.01 0.002 0.005 0.002 0.01 0.01 0.005 0.002
Ta-2 0.10 0.01 0.03 0.01 0.002 0.02 0.005 0.04 0.03 0.02 0.005
FTa-1 0.05 0.03 0.03 0.02 0.002 0.01 0.005 0.02 0.02 0.02 0.005
FTa-2 0.05 0.05 0.05 0.03 0.005 0.03 0.01 0.04 0.03 0.03 0.005
Ta & Nb Alloy
TaNb3 <3.5 0.01 0.03 0.02 0.002 0.03 0.005 0.04 0.03 0.03 0.005
TaNb20 17.0-23.0 0.01 0.03 0.03 0.002 0.03 0.005 0.04 0.03 0.03 0.005
TaNb40 35.0-42.0 0.01 0.02 0.01 0.015 0.01 0.01 0.05 0.02 0.005 0.01
Ta & W Alloy
TaW2.5 0.50 0.01 0.015 0.01 0.015 0.01 0.01 2.0-3.5 0.02 0.005 0.01
TaW10 0.10 0.01 0.015 0.01 0.015 0.10 0.01 9.0-11.0 0.02 0.005 0.10

Type Additional specified by the purchaser for Finished Product, Maximum %
C O N H
Ta-1 0.02 0.025 0.01 0.002
Ta-2 0.02 0.035 0.01 0.002
FTa-1 0.035 0.035 0.02 0.002
FTa-2 0.055 0.055 0.03 0.005
TaNb3 0.02 0.035 0.01 0.002
TaNb20 0.02 0.035 0.01 0.002
TaNb40 0.01 0.025 0.0015 0.02
TaW2.5 0.01 0.025 0.0015 0.02
TaW10 0.01 0.025 0.0015 0.02



Mechanical Properties of Tantalum and Alloys
Typical Room Temperature Mechanical Properties of Tantalum and Its Alloys
  Tantalum Ta2.5W Ta10W Ta40Nb
Ultimate Tensile Strength, MPa (KSI) 276 (40) 379 (55) 620 (90) 310 (45)
Yield Strength, MPa (KSI) 172 (25) 241 (35) 482 (70) 207 (30)
% Elongation 50 30 30 40
Modulus of elasticity 10 3 MPa (psi x 10 6 )... 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 (MPa)

Yield Strength
min, psi (MPa)
(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

ASTM B521:
Mechanical Properties for Seamless and Welded Tubes
  R05200/
R05400
R05252 R05255 R05240

Ultimate Tensile Strength, min psi (MPa)

30,000 (207)

40,000 (276)

70,000 (481)

40,000 (226)

Yield Strength, 0.2% offset, min, psi (MPa)

20,000 (138)

28,000 (193)

60,000 (414)

28,000 (193)

Elongation, min %, 1 or 2 inches (25 or 51 mm)

25

20

15

20