Grade 2 Tin Babbitt

Specification

ASTM B23:

Grade 2

QQ-T-90A:

No. 2

Composition

Sn (Tin):

89%

Sb (Antimony):

7.5%

Cu (Copper):

3.5%

Chemical Composition Limits: 88-90% Tin, 7-8% Antimony, 3-4% Copper

Trace Elements% (maximum allowable):

Iron (Fe):

0.0800%

Lead (Pb):

0.1000%

Arsenic (As):

0.1000%

Bismuth (Bi):

0.0800%

Zinc (Zn):

0.0050%

Aluminum (Al):

0.0050%

Component Elements Properties

Metric

English

Comments

Aluminum (Al): 

<= 0.0050 %

<= 0.0050 %

Antimony (Sb):

7.5 %

7.5 %

Arsenic (As):

<= 0.10 %

<= 0.10 %

Bismuth (Bi):

<= 0.080 %

<= 0.080 %

Cadmium (Cd): 

<= 0.050 %

<= 0.050 %

Copper (Cu):

3.5 %

3.5 %

Iron (Fe):

<= 0.080 %

<= 0.080 %

Lead (Pb): 

<= 0.35 %

<= 0.35 %

Tin (Sn):

89 %

89 %

Zinc (Zn): 

<= 0.0050 %

<= 0.0050 %

Technical Data

Metric

English

Comments

Density:

7.39 g/cc

0.267 lb/in³

Hardness, Brinell: 

24.5

24.5

10 mm ball/

500 kg load-30 sec.

Tensile Strength, Ultimate: 

77.0 MPa

11,200 psi

Chill cast

87.0 MPa

12,600 psi

Diecast

Elongation at Break: 

18 %

18 %

Chill Cast. Gage length = 4 x (area)^½

Compressive Yield Strength: 

42.1 MPa

6,110 psi

Ultimate Compressive Strength: 

102.7 MPa

14,900 psi

Fatigue Strength: 

33.0 MPa at  

2 x 10⁷ cycles

4790 psi at  

2 x 10⁷ cycles

chill cast,

R.R. Moore Test

Melting Range:

466-669°F (241-354°C)

Temperature

Tensile Strength

Elongation

Reduction

°C

°F

MPa

ksi

%(a

in area, %

20°C

68°F(b)

77

11.2

18%

25%

49°C

120°F

63

9.2

24%

27%

100°C

212°F (c)

45

6.5

23%

28%

149°C

300°F

28

4.0

32%

44%

(b) Compressive yield strength, 0.125% set, 42 MPa (6.1 ksi); Compressive strength, 25% set, 103 MPa (14.9 ksi)

(c) Compressive yield strength, 0.125% set, 21 MPa (3.0 ksi); Compressive strength, 25% set, 60 MPa (8.7 ksi)

Grade 2 Babbitt Alloy Mechanical Properties

Tensile Strength:

(Typical); cast at 600°F (315°C) into mold at 302°F (150°C): 12,600 psi  (87MPa)

Proportional Limit:

FOR TENSILE PROPERTIES OF CHILL CASTINGS, SEE TABLE 1 cast at 752°F (400°C) into mold at 212°F (100°C): 1,460 psi (10.1 MPa)

Hardness:

Chill cast; Cast at 600°F (315°C) into mold at 302°F (150°C) - 24 HB. Cast at 752°F (400°C) into mold at 212°F (100°C) - 22 HB.

Elastic Modulus Tension:

Cast at 750°F (400°C) into mold at 212°F (100°C) = 52 GPa (7.6 x 10⁶ psi)

Fatigue strength:

Chillcast, 33MPa (4.8 ksi) at 2 x 10⁷ cycles, R.R. Moore [type] test

Mass Characteristics:

Density: 7.39 mg/m³ (0.267 lbs./in³)

Melting Range:

466-669°F (241-354°C)

Fabrication Characteristics:

Casting temperature; Chill castings: 600°F (315°C)