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AMPCO® 18 Continuous‑Cast Alloy – Superior Strength, Fatigue Resistance, and Heat‑Treatable Properties

The exceptional wear and fatigue resistance of this alloy results from a controlled duplex alpha and beta phase. This alloy has high strength combined with good ductility and unusual toughness. The physical characteristics of this alloy can be varied by heat treatments (AMPCO® 18.22, 18.23 and 18.136).

Properties

General

PropertyTemperatureValue

Density

23.0 °C

7.45 g/cm³

Recycled Content

80 %

Mechanical

PropertyTemperatureValueComment

Compressive strength

23.0 °C

938 MPa

Elastic modulus

23.0 °C

110 - 112 GPa

Elongation A5

23.0 °C

16 %

Hardness, HBW

23.0 °C

174 - 183 [-]

HBW 10/3000

Hardness, Rockwell B

23.0 °C

88 - 90 [-]

Proportional limit in compression

23.0 °C

207 MPa

Reduction of area

23.0 °C

14 - 20 %

Shear strength

23.0 °C

400 MPa

Tensile strength

23.0 °C

620 - 662 MPa

Yield strength Rp0.5

23.0 °C

252 - 280 MPa

Thermal

PropertyTemperatureValue

Coefficient of thermal expansion

23.0 °C

1.62E-5 1/K

Specific heat capacity

23.0 °C

420 J/(kg·K)

Thermal conductivity

23.0 °C

63 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical conductivity

23.0 °C

8.00E+6 S/m

Specific Electrical conductivity

14 % IACS

Chemical properties

PropertyValue

Aluminium

10.5 %

Copper

Balance

Iron

3.5 %

Other

0.5 %

Technological properties

Property
Application areas

This alloy is well suited for use as gears, worm wheels, bushings and bearings. The machine tool industry has adopted AMPCO® 18 as standard for all applications requiring good sliding properties, wear resistance, fatigue resistance, toughness and/or resistance to deformation under load. AMPCO® 18 is used in steel mill service as screw down nuts, slippers (many of which are "cast to size"), gears, wedges and breaker blocks. AMPCO® 18 has an excellent corrosion resistance and is used in pickling service for such parts as hooks, crates and spreaders, etc.


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