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Home / Technology / Titanium Standards / ASTM F67-Unalloyed Titanium for Surgical Implants.

ASTM F67-Unalloyed Titanium for Surgical Implants.

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ASTM F67-Unalloyed Titanium for Surgical Implants.

ASTM F67

Unalloyed Titanium for Surgical Implant Applications

ASTM F67 is a standard specification for unalloyed titanium and titanium alloy for surgical implant applications (UNS R50250, UNS R50400, UNS R50550, UNS R50700). It covers the chemical and mechanical requirements for four grades of titanium and titanium alloy, designated as Grades 1, 2, 3, and 4. The standard also includes requirements for heat treatment, testing, and inspection of the material. The purpose of ASTM F67 is to ensure that titanium and titanium alloy surgical implant materials produced by manufacturers meet a set of min. requirements for their intended use in medical applications such as surgical implants. This specification also covers the requirement for both wrought and cast forms of titanium and titanium alloy.

Chemical Composition

Chemical requirements

Element

Composition,% (mass/mass)

Grade 1

UNS R50250

Grade 2

UNS R50400

Grade 3

UNS R50550

Grade 4

UNS R50700

Nitrogen, max

0.03

0.03

0.05

0.05

Carbon, max

0.08

0.08

0.08

0.08

Hydrogen, maxB

0.015

0.015

0.015

0.015

Iron, max

0.2

0.3

0.3

0.5

Oxygen, max

0.18

0.25

0.35

0.4

Titanium

balance

balance

balance

balance

Analysis Tolerances

Element

Limit or Maximum of Specified Range %(mass/mass)

Tolerance Under the Minimum or Over the Maximum Limit

Nitrogen

≤0.05

0.02

Carbon

0.10

0.02

Hydrogen

≤0.015

0.0020

Iron

≤0.25

0.10

Iron

＞0.25

0.15

Oxygen

≤0.20

0.02

Oxygen

＞0.20

0.03

Mechanical Properties

Mechanical Requirements: Annealed-Bar, Billet, Forgings, and Other Forms

Grade

Tensile Strength, min

Yield Strength, A (0.2 % Offset), min

Elongation

in 4D, min,

%

Reduction

of Area,

min, %C

KSI

MPA

KSI

MPA

1

35

240

25

170

24

30

2

50

345

40

275

20

30

3

65

450

55

380

18

30

4

80

550

70

483

15

25

Mechanical Requirements: Annealed Wire

Diameter, in(mm)

Grade

Ultimate tensile strength

Min, psi (MPa)

Yield strength(0.2%,offset)

Min, psi (MPa)

Elongation Min, (%)

Reduction of Area Min,(%)

≥0.125

(≥3.18)

Gr1

35(240)

25(170)

24

30

Gr2

50(345)

40(275)

20

30

Gr3

65(450)

55(380)

18

30

Gr4

80(550)

70(485)

15

25

≤0.062~0.125

(1.58~＜3.18)

Gr1

35(240)

25(170)

15

...

Gr2

50(345)

40(275)

12

...

Gr3

65(450)

55(380)

10

...

Gr4

80(550)

70(483)

8

...

≤0.020~0.062

(0.51~＜1.58

Gr1

35(240)

...

12

...

Gr2

50(345)

...

10

...

Gr3

65(450)

...

8

...

Gr4

80(550)

...

6

...

≤0.005~0.020

(0.13~＜0.51)

Gr1

35(240)

...

10

...

Gr2

50(345)

...

8

...

Gr3

65(450)

...

6

...

Gr4

80(550)

...

4

...

Round Wire Size Tolerances:

Diameter, in(mm)

Size Variation, in. (mm)

Out of round, in. (mm)

0.125~0.3125(3.18~7.94)

±0.002(0.051)

0.002(0.051)

0.030~＜0.125(0.76~＜3.18)

±0.001(0.025)

0.001(0.025)

0.010~＜0.030(0.25~＜0.76)

±0.0008(0.020)

0.0008(0.020)

0.005~＜0.010(0.13~＜0.25)

±0.0005(0.013)

0.0005(0.013)

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