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PRODUCT MATERIAL

188Download

 Alloy 188 is a cobalt base superalloy with a unique combination of high temperature strength and oxidation resistance, along with adequate ductility after prolonged exposure to the 1400-1600°F temperature range.
Cobalt alloys have an inherent advantage over the nickel base grades in high temperature creep. Alloy 188 is solid solution strengthened by a 14% tungsten addition, and further by M6C and M23C6 carbides. Alloy 188 is readily fabricated, being welded by both manual and automatic methods including electron beam, gas tungsten arc and resistance welding.
Chemistry

 

Cr

Ni

Co

W

La

B

C

Fe

Mn

Si

P

S

MIN

20.0

20.0

-

13.0

0.02

-

0.05

-

-

0.2

-

-

MAX

24.0

24.0

Balance

16.0

0.12

0.015

0.015

3.0

1.25

0.5

0.02

0.015

Specifications
AMS 5608, AMS 5801
EN 2.4683
PWA 1042
UNS R30188, Werkstoff 2.4683
Inventory
188 Coil, 188 Sheet, 188 Weld Wire
Common Trade Names
Alloy 188
Features
• Strength and oxidation resistant to 2000°F
• Good post-aging ductility
• Resistant to sulfate deposit hot corrosion
Applications
• Gas turbine engine combustor cans, spray bars, flame-holders and afterburner liners
Physical Properties
Density: 0.324 lb/in3
Melting Range: 2375 -2570°F

Temperature, °F

70

800

1000

1200

1400

1600

1800

Coefficient* of Thermal Expansion, in/in°F x 10-6

-

7.8

8.2

8.6

9.0

9.4

9.9

Thermal Conductivity
Btu • ft/ft2 • hr • °F

-

10.4

11.5

12.7

13.9

14.5

15.8

Modulus of Elasticity Dynamic, psi x 106

34

29

28

26

25

24

22

* 70°F to indicated temperature.
Mechanical Properties
Representative Tensile Properties, Sheet

Temperature, °F

70

1200

1400

1600

1800

2000

Ultimate Tensile Strength, ksi

137

103

90

60

35

19

0.2% Yield Strength, ksi

67

40

39

36

19

9

Elongation, %

53

59

63

64

59

32

Typical Stress-Rupture Strength

Temperature, °F

1400

1500

1600

1700

1800

100 Hours, ksi

32

22

14

9

5

1,000 Hours, ksi

23

15

9

6

2

188 is a Trademark of Haynes International